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Institute
- Medizin (3562)
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Following publication of the data presented by von Minckwitz and colleagues it has been brought to our attention that some patients should be scored differently. Stable disease was seen in three of the eighteen patients instead of two of the eighteen patients: one patient with transitional cell carcinoma treated at 4 µg/kg scFv(FRP5)-ETA per day, and two breast cancer patients treated at 4 and 12.5 µg/kg scFv(FRP5)-ETA per day. Disease progression occured in 9 of the eighteen patients evaluated (see corrected Table 2 overleaf). This does not affect the conclusions of our study. In addition we would like to correct the following errors: patient IDs for patients U01 and U02 in the original Table 2 were interchanged. In addition, patient N03 had a grade 3 elevation of gamma-glutamyl transferase, and not grade 2 (see corrected Table 2 overleaf).
Im Jahr 2003 begann die HNO-Universitätsklinik Frankfurt / Main mit der Einführung eines Qualitätsmanagement-Systems, die im August 2005 zur erfolgreichen Zertifizierung nach der vom Klinikumsvorstand geforderten DIN EN ISO 9001:2000 führte. Ziele unseres Qualitätsmanagements waren die Optimierung der internen Betriebsabläufe und die Standardisierung von Arbeitsvorgängen unter Einbeziehung von logistischen Schnittstellen mit externen Strukturen unter Berücksichtigung der besonderen Anforderungen einer Universitätsklinik. Neben einer grundsätzlichen Prüfung und Optimierung sämtlicher Organisationsabläufe wurden für die Kernprozesse unserer Klinik Zielvorgaben festgelegt. Diese Ziele betrafen die Qualität der Arbeitsabläufe für alle Bereiche der HNO-ärztlichen ambulanten und stationären Versorgung ebenso, wie Aufgaben in Forschung und Lehre, die durch ein Ausbildungscurriculum für Mitarbeiter und Sudenten abgebildet wurde. Es wurden aber auch Serviceaspekte, wie Terminvergabe und Befundübermittlung, sowie ökonomische und wirtschaftliche Aspekte unserer Arbeit optimiert. Durch Umstrukturierung und Neuorganisation konnte die Effizienz der Arbeitsabläufe deutlich gesteigert werden, wovon vor allem Patienten und Mitarbeiter erheblich profitieren. Die Einführung eines Qualitätsmanagementsystems in der Frankfurter HNO-Universitätsklinik war zunächst mit einem entsprechenden Arbeitsaufwand verbunden und erforderte ein Umdenken in den einzelnen Funktionsbereichen. Insgesamt überwiegt der positive Einfluss auf die Struktur und Arbeitsabläufe, sodass die Umsetzung eines Qualitätsmanagementsystems in der Universitätsklinik empfehlenswert ist.
k-MED entwickelte sich von einem fachbezogenen Projekt im Jahr 1999 zu einem e-Learning-Dienstleister mit umfangreichen Lehr-Lernangeboten sowie einer technischen und organisatorischen Infrastruktur für Autoren und Nutzer. Es bietet heute – Mitte 2006 – 5000 Studierenden, v.a. der Humanmedizin, ca. 170 Lernkurse aus 16 medizinischen Fächern. Das Projekt umfasst erfahrenes Fachpersonal und nutzt eine eigene Online-Autorenumgebung sowie eine internetbasierte Lernplattform, deren Funktionalitäten in Abstimmung mit evaluierten Lehr- und Lern-Szenarien ständig weiter entwickelt werden. Die wichtigste Aufgabe ist die Vollversorgung von Bildungseinrichtungen, darunter vor allem medizinische Fakultäten, mit Lehr-Lern- und Kommunikationsinstrumenten. Aktuelle Informationen sind zu finden unter http://www.k-med.org.
Mathematische Methoden in der Biologie haben sich in den vergangenen 25 Jahren zunehmend etabliert. Etwa in den Bereichen der Entwicklung von Organen und Organismen sind große Anstrengungen in der Mathematik unternommen worden, die grundlegenden Mechanismen der Entwicklung aufzudecken. Der einfache Gedanke, auf dem diese Methode aufbaut, ist ein reduktionistischer: Man verwendet einen minimalen Satz von in der Biologie beobachteten Wechselwirkungen – etwa zwischen den Zellen, die das betrachtete Gewebe aufbauen –, übersetzt sie in ein mathematisches System von dynamischen Gleichungen, löst diese auf dem Computer und prüft, ob sich in der Lösung die erwartete Struktur zeigt. Wenn dies allein aufgrund experimenteller Daten aus der Biologie nicht möglich ist, ergibt sich der größte Nutzen der mathematischen Beschreibung: Dann sind neue Hypothesen im mathematischen Modell notwendig, um das reale System beschreiben zu können. Damit sagen die Theoretiker Zusammenhänge voraus, die aus der Biologie alleine nicht ableitbar sind. Diese können durch neue gezielte Experimente verifiziert werden. Ein ähnlicher Ansatz wurde in jüngerer Zeit von unserer Gruppe am Frankfurter Instute for Advanced Studies (FIAS) in der Immunologie verwendet.
Der Morbus Parkinson tritt in der Regel sporadisch auf und ist nach dem Morbus Alzheimer die häufigste degenerative Erkrankung des menschlichen Nervensystems. Sie ist bei nicht-menschlichen Wirbeltieren unbekannt und befällt außer dem Nervensystem keine anderen Organe. Wie bei vielen anderen Krankheiten auch erkennt der Kliniker nur die späten und bereits Symptome verursachenden Stadien des Morbus Parkinson. Spezielle Fehlfunktionen der Motorik, wie Hypokinese, Rigor, Ruhetremor weisen zwar auf die Erkrankung hin, können jedoch unter dem Bild eines »Parkinsonismus« auch bei anderen Krankheiten auftreten. Kennzeichnend dagegen ist ein eigenartiger pathologischer Prozess, der sich durch die Entwicklung von Einschlusskörpern in Nervenzellen auszeichnet. Der Prozess beschränkt sich auf wenige empfängliche Nervenzelltypen im zentralen, peripheren und enterischen Nervensystem. Die Einschlusskörper entwickeln sich nicht spontan und erscheinen auch nicht regelmäßig im Verlauf der Alterung des Nervensystems, selbst bei über Hundertjährigen nicht. Man hat also Grund, sie als pathologische Bildungen zu betrachten, auch wenn sie anfänglich in nur geringer Dichte im Nervengewebe auftreten. Die frühen symptomfreien Stadien der Krankheit lassen sich erst nach dem Tod der Patienten nachweisen. Wesentliche Kriterien für die Stellung einer postmortalen Diagnose sind die Einschlusskörper. Wie sie sich entwickeln und in den verschiedenen Stadien der Krankheit im Nervensystem ausbreiten, beschreiben Prof. Dr. Heiko Braak und Dr. Dr. Kelly Del Tredici.
Im Altenheim gehören Psychopharmaka ganz selbstverständlich zum Pflegealltag. Damit daraus keine gefährliche Routine entsteht, hat ein Team aus Gerontopsychiatern, Medizinethikern und Juristen der Johann Wolfgang Goethe-Universität ein Frankfurter Pflegeheim auf dessen Wunsch hin unter die Lupe genommen. Ihr Maßnahmenkatalog gibt allen beteiligten Personen und Institutionen und sogar der Politik Hinweise, wie mehr Achtsamkeit im Umgang mit diesen Medikamenten erreicht werden kann. Es geht nämlich keineswegs darum, Psychopharmaka generell zu verteufeln. In manchen Fällen bemängeln die Fachleute, dass notwendige Antidementiva oder Antidepressiva nicht verschrieben wurden, in anderen wurden dagegen Doppelmedikation und oft zu lange Therapiedauer gerügt. Die Wissenschaftler entwickeln über 70 Handlungsempfehlungen, mit denen die Versorgung optimiert und somit die Lebensqualität der Bewohner erhöht werden kann.
Celiac disease
(2006)
Celiac disease is a chronic intestinal disease caused by intolerance to gluten. It is characterized by immune-mediated enteropathy, associated with maldigestion and malabsorption of most nutrients and vitamins. In predisposed individuals, the ingestion of gluten-containing food such as wheat and rye induces a flat jejunal mucosa with infiltration of lymphocytes. The main symptoms are: stomach pain, gas, and bloating, diarrhea, weight loss, anemia, edema, bone or joint pain. Prevalence for clinically overt celiac disease varies from 1:270 in Finland to 1:5000 in North America. Since celiac disease can be asymptomatic, most subjects are not diagnosed or they can present with atypical symptoms. Furthermore, severe inflammation of the small bowel can be present without any gastrointestinal symptoms. The diagnosis should be made early since celiac disease causes growth retardation in untreated children and atypical symptoms like infertility or neurological symptoms. Diagnosis requires endoscopy with jejunal biopsy. In addition, tissue-transglutaminase antibodies are important to confirm the diagnosis since there are other diseases which can mimic celiac disease. The exact cause of celiac disease is unknown but is thought to be primarily immune mediated (tissue-transglutaminase autoantigen); often the disease is inherited. Management consists in life long withdrawal of dietary gluten, which leads to significant clinical and histological improvement. However, complete normalization of histology can take years.
Das Projekt LaMedica (http://www.lamedica.de) hat zum Ziel, eine multimediale Lehr- und Lernplattform zu entwickeln, Inhalte für die Medizin zu erstellen und diese in die Lehre zu implementieren. Es wurde eine on-line Autorenumgebung geschaffen, die sehr unterschiedliche didaktische Ansätze unterstützt: systematische und vernetzte Wissensvermittlung, fallbasiertes Lernen, Erstellung von Vorlesungen und Lernerfolgskontrolle. Die Lehrinhalte können zielgruppenspezifisch aufbereitet und dargestellt werden und richten sich insbesondere an Studenten, Ärzte in der Weiterbildung und Fachärzte. Eine on-line Medien-Datenbank unterstützt die Wiederverwendung und den Austausch von Inhalten auf der Basis eines Content-Management-Systems durch Verwendung des Learning Objects Metadata Standards (LOM). Die Förderung erfolgt durch das BMBF (FKZ NM054A).
Background Anti-angiogenic treatment is believed to have at least cystostatic effects in highly vascularized tumours like pancreatic cancer. In this study, the treatment effects of the angiogenesis inhibitor Cilengitide and gemcitabine were compared with gemcitabine alone in patients with advanced unresectable pancreatic cancer. Methods A multi-national, open-label, controlled, randomized, parallel-group, phase II pilot study was conducted in 20 centers in 7 countries. Cilengitide was administered at 600 mg/m2 twice weekly for 4 weeks per cycle and gemcitabine at 1000 mg/m2 for 3 weeks followed by a week of rest per cycle. The planned treatment period was 6 four-week cycles. The primary endpoint of the study was overall survival and the secondary endpoints were progression-free survival (PFS), response rate, quality of life (QoL), effects on biological markers of disease (CA 19.9) and angiogenesis (vascular endothelial growth factor and basic fibroblast growth factor), and safety. An ancillary study investigated the pharmacokinetics of both drugs in a subset of patients. Results Eighty-nine patients were randomized. The median overall survival was 6.7 months for Cilengitide and gemcitabine and 7.7 months for gemcitabine alone. The median PFS times were 3.6 months and 3.8 months, respectively. The overall response rates were 17% and 14%, and the tumor growth control rates were 54% and 56%, respectively. Changes in the levels of CA 19.9 went in line with the clinical course of the disease, but no apparent relationships were seen with the biological markers of angiogenesis. QoL and safety evaluations were comparable between treatment groups. Pharmacokinetic studies showed no influence of gemcitabine on the pharmacokinetic parameters of Cilengitide and vice versa. Conclusion There were no clinically important differences observed regarding efficacy, safety and QoL between the groups. The observations lay in the range of other clinical studies in this setting. The combination regimen was well tolerated with no adverse effects on the safety, tolerability and pharmacokinetics of either agent.
Background Drug resistance to chemotherapy is often associated with increased malignancy in neuroblastoma (NB). One explanation for the link between resistance and malignancy might be that resistance facilitates cancer progression and invasion. To investigate this hypothesis, adhesion, transendothelial penetration and NCAM (CD56) adhesion receptor expression of drug-resistant versus drug-sensitive NB tumor cells were evaluated. Methods Acquired drug resistance was mimicked by exposing parental UKF-NB-2, UKF-NB-3 or IMR-32 tumor cells to increasing concentrations of vincristine- (VCR) or doxorubicin (DOX) to establish the resistant tumor cell sublines UKF-NB-2VCR, UKF-NB-2DOX, UKF-NB-3VCR, UKF-NB-3DOX, IMR-32VCR and IMR-32DOX. Additionally, the malignant behaviour of UKF-NB-4, which already possessed the intrinsic multidrug resistance (MDR) phenotype, was analyzed. UKF-NB-4 exposed to VCR or DOX were designated UKF-NB-4VCR or UKF-NB-4DOX. Combined phase contrast - reflection interference contrast microscopy was used to separately evaluate NB cell adhesion and penetration. NCAM was analyzed by flow cytometry, western blot and RT-PCR. Results VCR and DOX resistant tumor sublines showed enhanced adhesion and penetration capacity, compared to their drug naive controls. Strongest effects were seen with UKF-NB-2VCR, UKF-NB-3VCR and IMR-32DOX. DOX or VCR treatment also evoked increased invasive behaviour of UKF-NB-4. The process of accelerated tumor invasion was accompanied by decreased NCAM surface and protein expression, and down-regulation of NCAM coding mRNA. Transfection of UKF-NB-4VCR cells with NCAM cDNA led to a significant receptor up-regulation, paralleled by diminished adhesion to an endothelial cell monolayer. Conclusions It is concluded that NB cells resistant to anticancer drugs acquire increased invasive capacity relative to non-resistant parental cells, and that enhanced invasion is caused by strong down-regulation of NCAM adhesion receptors.
Background: Experimental animal data show that protection against severe acute respiratory syndrome coronavirus (SARS-CoV) infection with human monoclonal antibodies (mAbs) is feasible. For an effective immune prophylaxis in humans, broad coverage of different strains of SARS-CoV and control of potential neutralization escape variants will be required. Combinations of virus-neutralizing, noncompeting mAbs may have these properties. Methods and Findings: Human mAb CR3014 has been shown to completely prevent lung pathology and abolish pharyngeal shedding of SARS-CoV in infected ferrets. We generated in vitro SARS-CoV variants escaping neutralization by CR3014, which all had a single P462L mutation in the glycoprotein spike (S) of the escape virus. In vitro experiments confirmed that binding of CR3014 to a recombinant S fragment (amino acid residues 318–510) harboring this mutation was abolished. We therefore screened an antibody-phage library derived from blood of a convalescent SARS patient for antibodies complementary to CR3014. A novel mAb, CR3022, was identified that neutralized CR3014 escape viruses, did not compete with CR3014 for binding to recombinant S1 fragments, and bound to S1 fragments derived from the civet cat SARS-CoV-like strain SZ3. No escape variants could be generated with CR3022. The mixture of both mAbs showed neutralization of SARS-CoV in a synergistic fashion by recognizing different epitopes on the receptor-binding domain. Dose reduction indices of 4.5 and 20.5 were observed for CR3014 and CR3022, respectively, at 100% neutralization. Because enhancement of SARS-CoV infection by subneutralizing antibody concentrations is of concern, we show here that anti-SARS-CoV antibodies do not convert the abortive infection of primary human macrophages by SARS-CoV into a productive one. Conclusions: The combination of two noncompeting human mAbs CR3014 and CR3022 potentially controls immune escape and extends the breadth of protection. At the same time, synergy between CR3014 and CR3022 may allow for a lower total antibody dose to be administered for passive immune prophylaxis of SARS-CoV infection.
In einer vernetzten Welt machen Epidemien nicht an Ländergrenzen Halt. Mit der zunehmenden Verfügbarkeit von wirksamen Therapien in Entwicklungsländern wird nun auch das Wissen, das in den Industrieländern durch klinische Forschung gewonnen wurde, für Afrika und Südost-Asien interessant. Das Wissen um eine verbesserte Behandlung HIV-Infizierter mit benachteiligten Regionen in Afrika zu teilen, ist auch das Anliegen einer Klinikpartnerschaft zwischen dem Frankfurter HIVCENTER und der Karabong Klinik des Mafeteng Government Hospitals in Lesotho. Durch die Einbeziehung der Universitätsklinik in Stellenbosch, Südafrika, die eine Hochschulpartnerschaft mit der Universitätsklinik Frankfurt unterhält, soll zudem der Süd-Süd-Austausch zwischen den afrikanischen Partnern gestärkt werden.
Mit der Neuregelung der Studienplatzverteilung von 2005 haben die Universitäten in Deutschland die Möglichkeit, bis zu 60% der Studienplätze nach universitätseigenen Kriterien zu vergeben. Implizit wird vom Gesetzgeber und der öffentlichen Meinung gefordert, nicht-leistungsbezogene Kriterien und Persönlichkeitsmerkmale verstärkt zur Bewerberauswahl einzusetzen (Motivation, Identifikation, Vermeidung von Fehlvorstellungen). Da in Anbetracht der Bewerberzahlen mündliche Auswahlgespräche als ungeeignet erscheinen, wurde vom Fachbereich Medizin der Johann Wolfgang Goethe Universität ein Fragebogen entworfen, um nichtschulische Leistungen zu erfassen. Dieser Fragebogen wurde am Beginn des Wintersemesters 2005/2006 von allen Studienanfängern der JWG-Universität Frankfurt und der Medizinischen Universität Innsbruck ausgefüllt. Entgegen der initialen Erwartungen der Verfasser gaben nur etwa 15% Prozent Medizin-spezifische berufliche Vorerfahrungen an (Rettungsdienst, Ausbildung als Krankenschwester/pfleger oder ähnliches); dagegen wurden von etwa 60% angegeben, mindestens ein Musikinstrument zu spielen oder länger sportlich aktiv gewesen zu sein. Die Zusammenstellung der Selbstangaben zeigt, dass Medizin-relevante Vorkenntnisse nur bei einem kleinen Anteil der Studienbewerber in größerem Umfang vorhanden sind. Aufgrund der großen Streuung in der Art und Dauer der angegebenen Vorleistungen sollte die Erhebung von Parametern zur Beurteilung von soft skills, z.B. durch Online-Fragebogen, als (Vor)Selektionsinstrument nur sehr vorsichtig eingesetzt werden.
Background The proto-oncogene pituitary tumor-transforming gene (PTTG) has been shown to be abundantly overexpressed in a large variety of neoplasms likely promoting neo-vascularization and tumor invasiveness. In this study, we investigated a potential role for PTTG mRNA expression as a marker to evaluate the future clinical outcome of patients diagnosed with primary cancer of the head and neck. Methods Tumor samples derived from primary tumors of 89 patients suffering from a squamous cell carcinoma were analyzed for PTTG mRNA-expression and compared to corresponding unaffected tissue. Expression levels were correlated to standard clinico-pathological parameters based on a five year observation period. Results In almost all 89 tumor samples PTTG was found to be overexpressed (median fold increase: 2.1) when compared to the unaffected tissue specimens derived from the same patient. The nodal stage correlated with PTTG transcript levels with significant differences between pN0 (median expression: 1.32) and pN+ (median expression: 2.12; P = 0.016). In patients who developed a tumor recurrence we detected a significantly higher PTTG expression in primary tumors (median expression: 2.63) when compared to patients who did not develop a tumor recurrence (median expression: 1.29; P = 0.009). Since the median expression of PTTG in patients with tumor stage T1/2N0M0 that received surgery alone without tumor recurrence was 0.94 versus 3.82 in patients suffering from a tumor recurrence (P = 0.006), PTTG expression might provide a feasible mean of predicting tumor recurrence. Conclusion Elevated PTTG transcript levels might be used as a prognostic biomarker for future clinical outcome (i.e. recurrence) in primary squamous cell carcinomas of the head and neck, especially in early stages of tumor development.
Natural objects provide partially redundant information to the brain through different sensory modalities. For example, voices and faces both give information about the speech content, age, and gender of a person. Thanks to this redundancy, multimodal recognition is fast, robust, and automatic. In unimodal perception, however, only part of the information about an object is available. Here, we addressed whether, even under conditions of unimodal sensory input, crossmodal neural circuits that have been shaped by previous associative learning become activated and underpin a performance benefit. We measured brain activity with functional magnetic resonance imaging before, while, and after participants learned to associate either sensory redundant stimuli, i.e. voices and faces, or arbitrary multimodal combinations, i.e. voices and written names, ring tones, and cell phones or brand names of these cell phones. After learning, participants were better at recognizing unimodal auditory voices that had been paired with faces than those paired with written names, and association of voices with faces resulted in an increased functional coupling between voice and face areas. No such effects were observed for ring tones that had been paired with cell phones or names. These findings demonstrate that brief exposure to ecologically valid and sensory redundant stimulus pairs, such as voices and faces, induces specific multisensory associations. Consistent with predictive coding theories, associative representations become thereafter available for unimodal perception and facilitate object recognition. These data suggest that for natural objects effective predictive signals can be generated across sensory systems and proceed by optimization of functional connectivity between specialized cortical sensory modules.
RNA interference (RNAi) has emerged as a powerful tool to induce loss-of-function phenotypes by post-transcriptional silencing of gene expression. In this study we wondered whether inducible RNAi-cassettes integrated into cellular DNA possess the power to trigger neoplastic growth. For this purpose inducible RNAi vectors containing tetracycline (Tet)-responsive derivatives of the H1 promoter for the conditional expression of short hairpin RNA (shRNA) were used to target human polo-like kinase 1 (Plk1), which is overexpressed in a broad spectrum of human tumors. In the absence of doxycycline (Dox) HeLa clones expressing TetR, that carry the RNAi-cassette stably integrated, exhibited no significant alteration in Plk1 expression levels. In contrast, exposure to Dox led to marked downregulation of Plk1 mRNA to 3% and Plk1 protein to 14% in cell culture compared to mismatch shRNA/Plk1-expressing cells. As a result of Plk1 depletion cell proliferation decreased to 17%. Furthermore, for harnessing RNAi for silencing disease-related genes in vivo we transplanted inducible RNAi-HeLa cells onto nude mice. After administration of Dox knockdown of Plk1 expression was observed correlating to a significant inhibition of tumor growth. Taken together, our data revealed that genomically integrated RNAi-elements are suitable to hamper tumor growth by conditional expression of shRNA.
Background: PPARs exhibit anti-inflammatory capacities and are potential modulators of the inflammatory response. We hypothesized that their expression and/or function may be altered in cystic fibrosis (CF), a disorder characterized by an excessive host inflammatory response.
Methods: PPARα, β and γ mRNA levels were measured in peripheral blood cells of CF patients and healthy subjects via RT-PCR. PPARα protein expression and subcellular localization was determined via western blot and immunofluorescence, respectively. The activity of PPARα was analyzed by gel shift assay.
Results: In lymphocytes, the expression of PPARα mRNA, but not of PPARβ, was reduced (-37%; p < 0.002) in CF patients compared with healthy persons and was therefore further analyzed. A similar reduction of PPARα was observed at protein level (-26%; p < 0.05). The transcription factor was mainly expressed in the cytosol of lymphocytes, with low expression in the nucleus. Moreover, DNA binding activity of the transcription factor was 36% less in lymphocytes of patients (p < 0.01). For PPARα and PPARβ mRNA expression in monocytes and neutrophils, no significant differences were observed between CF patients and healthy persons. In all cells, PPARγ mRNA levels were below the detection limit.
Conclusion: Lymphocytes are important regulators of the inflammatory response by releasing cytokines and antibodies. The diminished lymphocytic expression and activity of PPARα may therefore contribute to the inflammatory processes that are observed in CF.
Background While there is enough convincing evidence in childhood acute lymphoblastic leukemia (ALL), the data on the pre-natal origin in childhood acute myeloid leukemia (AML) are less comprehensive. Our study aimed to screen Guthrie cards (neonatal blood spots) of non-infant childhood AML and ALL patients for the presence of their respective leukemic markers. Methods We analysed Guthrie cards of 12 ALL patients aged 2–6 years using immunoglobulin (Ig) and T-cell receptor (TCR) gene rearrangements (n = 15) and/or intronic breakpoints of TEL/AML1 fusion gene (n = 3). In AML patients (n = 13, age 1–14 years) PML/RARalpha (n = 4), CBFbeta/MYH11 (n = 3), AML1/ETO (n = 2), MLL/AF6 (n = 1), MLL/AF9 (n = 1) and MLL/AF10 (n = 1) fusion genes and/or internal tandem duplication of FLT3 gene (FLT3/ITD) (n = 2) were used as clonotypic markers. Assay sensitivity determined using serial dilutions of patient DNA into the DNA of a healthy donor allowed us to detect the pre-leukemic clone in Guthrie card providing 1–3 positive cells were present in the neonatal blood spot. Results In 3 patients with ALL (25%) we reproducibly detected their leukemic markers (Ig/TCR n = 2; TEL/AML1 n = 1) in the Guthrie card. We did not find patient-specific molecular markers in any patient with AML. Conclusion In the largest cohort examined so far we used identical approach for the backtracking of non-infant childhood ALL and AML. Our data suggest that either the prenatal origin of AML is less frequent or the load of pre-leukemic cells is significantly lower at birth in AML compared to ALL cases.
Gute naturwissenschaftliche Vorkenntnisse sind insbesondere für den vorklinischen Studienabschnitt wichtig. Wegen der heterogenen Auswahl von Leistungskursen und Abituranforderungen kann jedoch nicht unbedingt von einem einheitlichen Wissensstand ausgegangen werden. Daher wurde versucht, mit einem Testbogen aus insgesamt 40 Aufgaben zur Biologie, Chemie, Mathematik und Physik den Wissensstand der Studienanfänger in Humanmedizin in Deutschland zu quantifizieren. Der Fragebogen enthielt neben Faktenaufgaben auch Anwendungen vor allem mathematischer und chemischer Prinzipien. Alle Fragen mussten durch Freitextantworten oder Skizzen beantwortet werden. Teilgenommen haben insgesamt 2 935 Studienanfänger des Wintersemesters 2004/2005 von 14 deutschen Universitäten (etwa 40% des Jahrganges). Im Mittel wurden 14,34 der 40 Aufgaben richtig beantwortet; etwas bessere Kenntnisse wurden in den 15 Biologiefragen (6,89) und den 8 Mathematikfragen erreicht (3,23), während vor allem in Chemie (2,18 von 10 Fragen) und Physik (1,55 von 8 Fragen) große Wissenslücken bestehen. Die Ergebnisse bestätigen, dass die naturwissenschaftlichen Vorkenntnisse der Studienanfänger schlecht sind; sie erfordern einen größeren Zeitaufwand für die Vermittlung des Abiturwissens im ersten vorklinischen Semester. Sinnvoll erscheint alternativ die verpflichtende Teilnahme an Zusatzkursen in diesen Fächern vor Aufnahme des eigentlichen Fachstudiums.
Maßgeblich unter dem wachsenden externen Druck hat die didaktische Qualifizierung in den medizinischen Fakultäten an Bedeutung gewonnen. Im Rahmen der Professionalisierung der medizinischen Aus-, Fort- und Weiterbildung ist eine pädagogisch-didaktische Ausbildung der Lehrenden unumgänglich. Um Orientierung und Argumentationshilfe zu geben, werden in einer dreiteiligen Artikelfolge Stellenwert der Medizindidaktik, Anforderungsprofil der Angebote und Konzepte zur Implementierung und zur Erfolgsmessung für den deutschsprachigen Raum beleuchtet. In Teil II beleuchten wir den Ausbildungsbedarf und erstellen ein Anforderungsprofil für ein strukturiertes systematisches Qualifizierungsangebot. Der Hauptbedarf besteht in der Qualifizierung der Lehrenden, die den täglichen Unterricht durchführen. Insbesondere sie brauchen das Handwerkszeug, das ihnen erlaubt, ihre verschiedenen Lehraufgaben effizienter zu bewältigen. Seitens der Fakultät und der Studierenden bestehen Ansprüche an qualifizierte Lehrende; ebenso bestehen Forderungen seitens der Lehrenden an adäquat qualifizierende Kurse. Zur Umsetzung dieser berechtigten Ansprüche sind modular aufgebaute Programme nötig, die eine zumindest national qualitativ und quantitativ vergleichbare Ausbildung gewährleisten. Anforderungen an derartige Kurse sind bereits definiert und lokal zum Beispiel in Baden-Württemberg und zum Teil auch in Nordrhein-Westfalen umgesetzt. Es gilt nun, diese auf breiter Basis in die Praxis umzusetzen.
Maßgeblich unter dem wachsenden externen Druck hat die didaktische Qualifizierung in den medizinischen Fakultäten an Bedeutung gewonnen. Im Rahmen der Professionalisierung der medizinischen Aus-, Fort- und Weiterbildung ist eine pädagogisch-didaktische Ausbildung der Lehrenden unumgänglich. Um Orientierung und Argumentationshilfe zu geben, werden in einer dreiteiligen Artikelfolge Stellenwert der Medizindidaktik, Anforderungsprofil der Angebote und Konzepte zur Implementierung und zur Erfolgsmessung für den deutschsprachigen Raum beleuchtet. In Teil I geben wir eine Bestandsaufnahme zur Medizindidaktik. Aktuell gibt es bundesweit ein breit gefächertes Qualifizierungsangebot. Es reicht von einfachen unstrukturierten Kurzfortbildungen wie zum Beispiel Vorträgen und Seminaren, die inhaltlich, formal und qualitativ eine große Beliebigkeit zeigen, bis hin zu umfassenden mehrjährigen (Aufbau-)Studiengängen mit "Master-Degree". Im internationalen Vergleich fehlt in Deutschland ein allgemein verbindliches "Basis-Programm", das die täglich Lehrenden systematisch auf ihre Ausbildungsaufgaben vorbereitet. Dies ist bisher nur lokal umgesetzt wie zum Beispiel in Baden-Württemberg mit dem ministeriell zertifizierten Programm der Medizindidaktischen Qualifikation I und II. Vergleichbares ist in Nordrhein-Westfalen und Bayern im Aufbau.
Alle Leistungsnachweise des klinischen Studienabschnittes nach neuer Ärztlicher Approbationsordnung müssen benotet werden; hierzu sind in der Regel schriftliche Prüfungen notwendig. Bisher erprobte Methoden beinhalten die Prüfung passiven Wissens (Einfachauswahlfragen, multiple choice-Fragen, progress test-Fragen) und aktiven Wissens (short essay questions, long essay questions). Vor- und Nachteile dieser Verfahren werden diskutiert, sowie die zur Erstellung, Durchführung und Auswertung schriftlicher Prüfungen notwendigen Ressourcen.
Gene trapping is a method of generating murine embryonic stem (ES) cell lines containing insertional mutations in known and novel genes. A number of international groups have used this approach to create sizeable public cell line repositories available to the scientific community for the generation of mutant mouse strains. The major gene trapping groups worldwide have recently joined together to centralize access to all publicly available gene trap lines by developing a user-oriented Website for the International Gene Trap Consortium (IGTC). This collaboration provides an impressive public informatics resource comprising ~45 000 well-characterized ES cell lines which currently represent ~40% of known mouse genes, all freely available for the creation of knockout mice on a non-collaborative basis. To standardize annotation and provide high confidence data for gene trap lines, a rigorous identification and annotation pipeline has been developed combining genomic localization and transcript alignment of gene trap sequence tags to identify trapped loci. This information is stored in a new bioinformatics database accessible through the IGTC Website interface. The IGTC Website (www.genetrap.org) allows users to browse and search the database for trapped genes, BLAST sequences against gene trap sequence tags, and view trapped genes within biological pathways. In addition, IGTC data have been integrated into major genome browsers and bioinformatics sites to provide users with outside portals for viewing this data. The development of the IGTC Website marks a major advance by providing the research community with the data and tools necessary to effectively use public gene trap resources for the large-scale characterization of mammalian gene function.
Antileukoproteinase (ALP) is a physiological inhibitor of granulocytic serine proteases that has been shown to have anti-inflammatory properties in addition to its antiproteolytic activity. On the basis of its potential to block anti-collagen type II (CII) antibody-induced arthritis (CAIA) and to suppress the conformational activation of β2-integrins in leukocytes, the present study was undertaken to investigate its interference with leukocyte adherence to cytokine-activated endothelium. The potential of recombinant ALP to block the interactions of leukocytes with the endothelial lining was concomitantly investigated in vitro and in vivo. Thus, intravital fluorescence microscopic imaging of leukocyte rolling and firm adhesion to postcapillary venules were performed in the knee joints of DBA1/J mice after intravenous injection of anti-CII mAbs. An IL-1β-activated endothelial layer formed by a murine glomerular cell line (glEND.2) was used to assay the interaction with human leukocytes in vitro. Electromobility shift and luciferase reporter gene assays permitted the analysis of cytokine-induced activation of the NF-κB pathway. Fluorescence-activated cell sorting was applied to determine endothelial E-selectin expression. Leukocyte rolling and firm adhesion to the synovial endothelium in an early response to the anti-CII antibody transfer were significantly decreased in ALP-pretreated mice. Concomitantly, ALP suppressed the IL-1β-induced NF-κB activation and the upregulation of E-selectin expression in glEND.2 cells in vitro. These findings support the notion that the newly uncovered properties of ALP to interfere with cytokine signalling and upregulation of adhesion molecules in endothelial cells are likely to contribute to the therapeutic potential of ALP in immune-complex-induced tissue injury.
The pathogenic spirochete Leptospira interrogans disseminates throughout its hosts via the bloodstream, then invades and colonizes a variety of host tissues. Infectious leptospires are resistant to killing by their hosts' alternative pathway of complement-mediated killing, and interact with various host extracellular matrix (ECM) components. The LenA outer surface protein (formerly called LfhA and Lsa24) was previously shown to bind the host ECM component laminin and the complement regulators factor H and factor H-related protein-1. We now demonstrate that infectious L. interrogans contain five additional paralogs of lenA, which we designated lenB, lenC, lenD, lenE and lenF. All six genes encode domains predicted to bear structural and functional similarities with mammalian endostatins. Sequence analyses of genes from seven infectious L. interrogans serovars indicated development of sequence diversity through recombination and intragenic duplication. LenB was found to bind human factor H, and all of the newly-described Len proteins bound laminin. In addition, LenB, LenC, LenD, LenE and LenF all exhibited affinities for fibronectin, a distinct host extracellular matrix protein. These characteristics suggest that Len proteins together facilitate invasion and colonization of host tissues, and protect against host immune responses during mammalian infection.
Hintergrund: Im vorzustellenden Projekt wird der Frage nachgegangen, welche Auswirkungen die Europäisierung der Arzneimittelpolitik auf die in Deutschland gültigen Sicherheitsstandards hat. Die Festlegung von Sicherheitsstandards geschieht einerseits hinsichtlich der Zulassung von Arzneimitteln (Nachweis von Qualität, Wirksamkeit und Unbedenklichkeit). Zudem wird das Nutzen-Risiko-Verhältnis bereits zugelassener Präparate in einem System der Nachmarktkontrolle (Pharmakovigilanz) beobachtet, um unerwünschte Arzneimittelwirkungen erfassen und gegebenenfalls darauf reagieren zu können. Die Europäische Kommission bemüht sich seit mehreren Jahrzehnten um eine Vereinheitlichung der Arzneimittelzulassung innerhalb der EU. Beabsichtigt ist die Herstellung eines einheitlichen europäischen Arzneimittelmarktes. Im Netzwerk europäischer Arzneimittelpolitik sind die pharmazeutischen Hersteller ein einflussreicher Akteur. Mit der Dominanz industrieller Interessen ist die Befürchtung verbunden, dass das Ziel der Arzneimittelsicherheit gegenüber ökonomischen Interessen in den Hintergrund tritt. Eine mögliche Konsequenz wäre die Aufweichung von Standards auf der nationalen Ebene. Material/Methoden: Die Auswirkungen der Europäisierung der Arzneimittelpolitik auf die Sicherheitsstandards werden mittels einer Dokumentenanalyse erfasst. Das untersuchte Material setzt sich einerseits aus den europäischen Rechtsetzungsakten (Verordnungen, Richtlinien, Leitlinien), andererseits aus den daraus abzuleitenden Veränderungen in deutschen Gesetzen und Verordnungen zusammen. Beginnend mit der ersten europäischen Verordnung im Jahr 1965 und ihren Konsequenzen für das deutsche Arzneimittelgesetz bis zur Etablierung und Revision europäischer Zulassungsverfahren wird anhand der relevanten Dokumente die Entwicklung der Sicherheitsstandards im Europäisierungsprozess nachvollzogen. Ergebnisse/Diskussion: Erste Untersuchungsergebnisse weisen darauf hin, dass die schrittweise Europäisierung der Arzneimittelregulierung für Deutschland in der Tendenz eine Erhöhung von Sicherheitsstandards zur Folge hatte. Der Prozess verlief in unterschiedlichen Phasen und bewirkte in seinen Anfängen seit Mitte der 1960er Jahre eine nachholende Einführung sowie eine kontinuierliche Weiterentwicklung regulativer Standards. Mit der Forcierung des europäischen Binnenmarktprojektes Mitte der 1980er Jahre zeichnet sich eine stärkere industriepolitische Akzentuierung ab. Die Arzneimittelzulassung wird zunehmend hinsichtlich ihrer Wirkung auf die globale Wettbewerbsfähigkeit der europäischen Hersteller bewertet. Jüngere Entwicklungen rücken die Beschleunigung und Entbürokratisierung der Verfahren in den Mittelpunkt.
Neuronal nAChRs are a diverse family of pentameric ion channels with wide distribution throughout cells of the nervous and immune systems. However, the role of specific subtypes in normal and pathological states remains poorly understood due to the lack of selective probes. Here, we used a binding assay based on acetylcholine-binding protein (AChBP), a homolog of the nicotinic acetylcholine ligand-binding domain, to discover a novel alpha-conotoxin (alpha-TxIA) in the venom of Conus textile. alpha-TxIA bound with high affinity to AChBPs from different species and selectively targeted the alpha3beta2 nAChR subtype. A co-crystal structure of Ac-AChBP with the enhanced potency analog TxIA(A10L), revealed a 20° backbone tilt compared to other AChBP–conotoxin complexes. This reorientation was coordinated by a key salt bridge formed between Arg5 (TxIA) and Asp195 (Ac-AChBP). Mutagenesis studies, biochemical assays and electrophysiological recordings directly correlated the interactions observed in the co-crystal structure to binding affinity at AChBP and different nAChR subtypes. Together, these results establish a new pharmacophore for the design of novel subtype-selective ligands with therapeutic potential in nAChR-related diseases.
The majority of cells are equipped to detect and decipher physical stimuli, and then react to these stimuli in a cell type-specific manner. Ultimately, these cellular behaviors are synchronized to produce a tissue response, but how this is achieved remains enigmatic. Here, we investigated the genetic basis for mechanotransduction using the bone marrow as a model system. We found that physical stimuli produced a pattern of principal strain that precisely corresponded to the site-specific expression of sox9 and runx2, two transcription factors required for the commitment of stem cells to a skeletogenic lineage, and the arrangement and orientation of newly deposited type I collagen fibrils. To gain insights into the genetic basis for skeletal mechanotransduction we conditionally inactivated focal adhesion kinase (FAK), an intracellular component of the integrin signaling pathway. By doing so we abolished the mechanically induced osteogenic response and thus identified a critical genetic component of the molecular machinery required for mechanotransduction. Our data provide a new framework in which to consider how physical forces and molecular signals are synchronized during the program of skeletal regeneration.
Blutproben und Gewebe von Familien mit erblich bedingten degenerativen Erkrankungen wie Parkinson sind ein zentrales Forschungsobjekt der neu eingerichteten Forschungsprofessur »Molekulare Neurogenetik« innerhalb der Neurologischen Klinik der Universität Frankfurt. Sind die verantwortlichen Mutationen identifiziert, werden sie im Hirngewebe von Mäusen künstlich erzeugt. Aus der Untersuchung der krankhaften Veränderungen lassen sich Diagnostik und Therapie weiter entwickeln. Als bisherigen Höhepunkt unserer Forschungstätigkeit haben wir in einigen Parkinson- Familien als Krankheitsursache den Funktionsverlust eines Eiweißes namens PINK1 in den Mitochondrien nachgewiesen. Aufgrund dieser Beobachtung lässt sich oxidativer Stress als auslösender Schritt im Krankheitsgeschehen interpretieren. Experimentelle Therapien mit anti-oxidativen Medikamenten sind in Zellkultur getestet worden und sollen künftig auch im Mausmodell zum Einsatz kommen.
Viele Menschen befürchten, die Medizin kenne am Lebensende keine Grenzen. Wie können Bürger in Fragen ihres eigenen Todes selbst bestimmen? Seit im Frühjahr zwei sehr verschiedene Gesetzentwürfe vorgelegt worden sind, wird in der Öffentlichkeit noch lebhafter darüber diskutiert, wie der Umgang mit Patientenverfügungen geregelt werden soll. Brauchen wir überhaupt Patientenverfügungen, in denen versucht wird, verschiedene Eventualitäten gedanklich vorwegzunehmen? Der Medizinethiker Stephan Sahm bezweifelt dies. Denn diese Dokumente erweisen sich als ein unzugängliches Instrument. Alternativen sind notwendig. Dazu zählen die »Natürliche Stellvertreterschaft durch Angehörige«, die Vorsorgevollmacht und der »Umfassende Vorsorgeplan«. Dabei handelt es sich um eine Strategie, die an den veränderten Bedürfnissen des Patienten ausgerichtet ist. Denn Sahm hat bei seinen empirischen Studien festgestellt, dass sich Blickwinkel und Vorstellungen deutlich verändern, ob man sich nun als Gesunder oder als Kranker mit diesem Thema beschäftigt.
Poster presentation Background Single nucleotide polymorphisms (SNPs) of the TNF gene at positions -238 and -308 have earlier been associated with psoriasis vulgaris and psoriatic arthritis (PsA). However, a strong linkage disequilibrium at the chromosomal region 6p21 renders the interpretation of these findings difficult since also other risk factors for psoriasis (PSORS1) than SNPs of the TNF gene have bee mapped to that particular region. Therefore, in this study several SNPs of the TNF gene and of its neighbouring lymphotoxin alpha (LTA) gene were analysed independently and dependently on carrying the PSORS1 risk allele. Methods SNPs in the promoter of the TNF gene (-238G/A, -308G/A, -857C/T, -1031T/C), and one SNP of the LTA gene (+252A/G), of the TNLFRSF1A gene (+36A/G) and of the TNLFRSF1B gene (+676T/G), respectively, were genotyped in 375 psoriasis patients, 375 PsA patients, and 376 controls. The tryptophan–tryptophan–cysteine–cysteine haplotype of the CCHCR1 gene (CCHCR1*WWCC) was used to estimate the genetic impact of the PSORS1 risk allele. Results Whereas an earlier-described association of allele TNF*-238A with psoriasis could be confirmed, our study revealed that this association was completely dependent on concomitant carriage of the PSORS1 risk allele. For PsA, but not psoriasis vulgaris without joint manifestations, strong association with the allele TNF*-857T was detected (OR = 1.956; P value corrected for multiple testing, Pcorr = 0.0025) also in patients negative for the PSORS1 risk allele. Conclusion Our results indicate genetic differences between psoriasis vulgaris patients with and without joint manifestation. While the previously reported association between TNF*-238A and psoriasis seems to primarily reflect linkage disequilibrium with PSORS1, TNF*-857T may represent a risk factor for PsA independent of PSORS1. A potential pathophysiologic relevance of the elucidated genetic association is further suggested by previously reported experimental evidence for a functional impact of the respective TNF polymorphism on TNFalpha expression levels.
A novel interhemispheric interaction: modulation of neuronal cooperativity in the visual areas
(2007)
Background: The cortical representation of the visual field is split along the vertical midline, with the left and the right hemi-fields projecting to separate hemispheres. Connections between the visual areas of the two hemispheres are abundant near the representation of the visual midline. It was suggested that they re-establish the functional continuity of the visual field by controlling the dynamics of the responses in the two hemispheres. Methods/Principal Findings: To understand if and how the interactions between the two hemispheres participate in processing visual stimuli, the synchronization of responses to identical or different moving gratings in the two hemi-fields were studied in anesthetized ferrets. The responses were recorded by multiple electrodes in the primary visual areas and the synchronization of local field potentials across the electrodes were analyzed with a recent method derived from dynamical system theory. Inactivating the visual areas of one hemisphere modulated the synchronization of the stimulus-driven activity in the other hemisphere. The modulation was stimulus-specific and was consistent with the fine morphology of callosal axons in particular with the spatio-temporal pattern of activity that axonal geometry can generate. Conclusions/Significance: These findings describe a new kind of interaction between the cerebral hemispheres and highlight the role of axonal geometry in modulating aspects of cortical dynamics responsible for stimulus detection and/or categorization.
Was passiert auf molekularer Ebene, wenn der Körper altert? Eine Antwort darauf lautet: Es häufen sich irreparable Schäden an Zellen, an Zellbestandteilen wie den Organellen, der DNA oder Eiweißen und anderen Molekülen. DassFehler passieren, ist unvermeidlich, denn jeder Stoffwechselvorgang birgt eine gewisse Störanfälligkeit in sich. Ein junger Organismus ist dank ausgefeilter Reparatursysteme in der Lage, Fehler zu korrigieren. Nimmt diese Fähigkeit mit dem Altern ab, so treten zwei Arten von Problemen mit besonders weitreichenden Folgen auf: Fehler bei der Replikation (dem Kopieren) der DNA und molekulare Schäden, die freie Radikale anrichten. So können Defekte der DNA einerseits die Entstehung von Tumoren verursachen, andererseits aber auch Alterungsprozesse beschleunigen.
Background Bacterial DNA containing motifs of unmethylated CpG dinucleotides (CpG-ODN) initiate an innate immune response mediated by the pattern recognition receptor Toll-like receptor 9 (TLR9). This leads in particular to the expression of proinflammatory mediators such as tumor necrosis factor (TNF-alpha) and interleukin-1beta (IL-1beta). TLR9 is expressed in human and murine pulmonary tissue and induction of proinflammatory mediators has been linked to the development of acute lung injury. Therefore, the hypothesis was tested whether CpG-ODN administration induces an inflammatory response in the lung via TLR9 in vivo. Methods Wild-type (WT) and TLR9-deficient (TLR9-D) mice received CpG-ODN intraperitoneally (1668-Thioat, 1 nmol/g BW) and were observed for up to 6 hrs. Lung tissue and plasma samples were taken and various inflammatory markers were measured. Results In WT mice, CpG-ODN induced a strong activation of pulmonary NFKB as well as a significant increase in pulmonary TNF-alpha and IL-1beta mRNA/protein. In addition, cytokine serum levels were significantly elevated in WT mice. Increased pulmonary content of lung myeloperoxidase (MPO) was documented in WT mice following application of CpG-ODN. Bronchoalveolar lavage (BAL) revealed that CpG-ODN stimulation significantly increased total cell number as well as neutrophil count in WT animals. In contrast, the CpG-ODN-induced inflammatory response was abolished in TLR9-D mice. Conclusion This study suggests that bacterial CpG-ODN causes lung inflammation via TLR9.
Background During gram-negative sepsis, lipopolysaccharide (LPS) induces tissue factor expression on monocytes. The resulting disseminated intravascular coagulation leads to tissue ischemia and worsens the prognosis of septic patients. There are indications, that fever reduces the mortality of sepsis, the effect on tissue factor activity on monocytes is unknown. Therefore, we investigated whether heat shock modulates LPS-induced tissue factor activity in human blood. Methods Whole blood samples and leukocyte suspensions, respectively, from healthy probands (n = 12) were incubated with LPS for 2 hours under heat shock conditions (43°C) or control conditions (37°C), respectively. Subsequent to further 3 hours of incubation at 37°C the clotting time, a measure of tissue factor expression, was determined. Cell integrity was verified by trypan blue exclusion test and FACS analysis. Results Incubation of whole blood samples with LPS for 5 hours at normothermia resulted in a significant shortening of clotting time from 357 ± 108 sec to 82 ± 8 sec compared to samples incubated without LPS (n = 12; p < 0.05). This LPS effect was mediated by tissue factor, as inhibition with active site-inhibited factor VIIa (ASIS) abolished the effect of LPS on clotting time. Blockade of protein synthesis using cycloheximide demonstrated that LPS exerted its procoagulatory effect via an induction of tissue factor expression. Upon heat shock treatment, the LPS effect was blunted: clotting times were 312 ± 66 s in absence of LPS and 277 ± 65 s in presence of LPS (n = 8; p > 0.05). Similarly, heat shock treatment of leukocyte suspensions abolished the LPS-induced tissue factor activity. Clotting time was 73 ± 31 s, when cells were treated with LPS (100 ng/mL) under normothermic conditions, and 301 ± 118 s, when treated with LPS (100 ng/mL) and heat shock (n = 8, p < 0.05). Control experiments excluded cell damage as a potential cause of the observed heat shock effect. Conclusion Heat shock treatment inhibits LPS-induced tissue factor activity in human whole blood samples and isolated leukocytes.
Background: Models of isolated and perfused kidneys are used to study the effects of drugs, hazardous or toxic substances on renal functions. Since physiological and morphological parameters of small laboratory animal kidneys are difficult to compare to human renal parameters, porcine kidney perfusion models have been developed to simulate closer conditions to the human situation, but exact values of renal parameters for different collection and perfusion conditions have not been reported so far. If the organs could be used out of regular slaughtering processes animal experiments may be avoided.
Methods: To assess renal perfusion quality, we analyzed different perfusion settings in a standardized model of porcine kidney hemoperfusion with organs collected in the operating theatre (OP: groups A-D) or in a public abattoir (SLA: group E) and compared the data to in vivo measurements in living animals (CON). Experimental groups had defined preservation periods (0, 2 and 24 hrs), one with additional albumin in the perfusate (C) for edema reduction.
Results: Varying perfusion settings resulted in different functional values (mean +/- SD): blood flow (RBF [ml/min*100 g]: (A) 339.9 +/- 61.1; (C) 244.5 +/- 53.5; (D) 92.8 +/- 25.8; (E) 153.8 +/- 41.5); glomerular filtration (GFR [ml/min*100 g]: (CON) 76.1 +/- 6.2; (A) 59.2 +/- 13.9; (C) 25.0 +/- 10.6; (D) 1.6 +/- 1.3; (E) 16.3 +/- 8.2); fractional sodium reabsorption (RFNa [%] (CON) 99.8 +/- 0.1; (A) 82.3 +/- 8.1; (C) 86.8 +/- 10.3; (D) 38.4 +/- 24.5; (E) 88.7 +/- 5.8). Additionally the tubular coupling-ratio of Na-reabsorption/O2-consumption was determined (TNa/O2-cons [mmol-Na/mmol- O2] (CON) 30.1; (A) 42.0, (C) 80.6; (D) 17.4; (E) 23.8), exhibiting OP and SLA organs with comparable results.
Conclusion: In the present study functional values for isolated kidneys with different perfusion settings were determined to assess organ perfusion quality. It can be summarized that the hemoperfused porcine kidney can serve as a biological model with acceptable approximation to in vivo renal physiology, also if the organs originate from usual slaughtering processes.
Poor condition subarachnoid hemorrhage (SAH) patients present a high mortality and morbidity. In this study, we reviewed the acute interventional (surgical and endovascular) management of 109 SAH-poor condition patients, who were treated as early as logistically possible after confirming stable circulation parameters. Patients over the age of 70 years, without clinical response to painful stimulation were excluded. We recognized at least 3 different postinterventional therapeutic approaches: (1) Norm- or hypovolemic, normotensive hemodilution in 30 patients with space-occupying intracranial hematomas as well as in 31 cases with acute cerebro-spinal-fluid obstruction. (2) Normovolemic, hypertensive hemodilution after unilateral decompressive craniotomy in 23 surgical- and 2 endovascular-treated patients with focalized space occupying lesions and reduced cerebral perfusion. (3) Hypovolemic, normo-, or hypertensive hemodilution after bilateral decompressive craniotomy in 23 cases with massive brain-swelling. We observed a reduced mortality (21%). The overall late outcome was favorable in 56% and unfavorable in 23%. Selective aggressive treatment adapted to increase the cerebral perfusion, seems to be an effective therapy to improve the survival and outcome of several poor condition SAH-patients.
Introduction: Metabolic acidosis during hemorrhagic shock is common and conventionally considered to be due to hyperlactatemia. There is increasing awareness, however, that other nonlactate, unmeasured anions contribute to this type of acidosis.
Methods: Eleven anesthetized dogs were hemorrhaged to a mean arterial pressure of 45 mm Hg and were kept at this level until a metabolic oxygen debt of 120 mLO2/kg body weight had evolved. Blood pH, partial pressure of carbon dioxide, and concentrations of sodium, potassium, magnesium, calcium, chloride, lactate, albumin, and phosphate were measured at baseline, in shock, and during 3 hours post-therapy. Strong ion difference and the amount of weak plasma acid were calculated. To detect the presence of unmeasured anions, anion gap and strong ion gap were determined. Capillary electrophoresis was used to identify potential contributors to unmeasured anions.
Results: During induction of shock, pH decreased significantly from 7.41 to 7.19. The transient increase in lactate concentration from 1.5 to 5.5 mEq/L during shock was not sufficient to explain the transient increases in anion gap (+11.0 mEq/L) and strong ion gap (+7.1 mEq/L), suggesting that substantial amounts of unmeasured anions must have been generated. Capillary electrophoresis revealed increases in serum concentration of acetate (2.2 mEq/L), citrate (2.2 mEq/L), alpha-ketoglutarate (35.3 microEq/L), fumarate (6.2 microEq/L), sulfate (0.1 mEq/L), and urate (55.9 microEq/L) after shock induction.
Conclusion: Large amounts of unmeasured anions were generated after hemorrhage in this highly standardized model of hemorrhagic shock. Capillary electrophoresis suggested that the hitherto unmeasured anions citrate and acetate, but not sulfate, contributed significantly to the changes in strong ion gap associated with induction of shock.
Visual selective attention and visual working memory (WM) share the same capacity-limited resources. We investigated whether and how participants can cope with a task in which these 2 mechanisms interfere. The task required participants to scan an array of 9 objects in order to select the target locations and to encode the items presented at these locations into WM (1 to 5 shapes). Determination of the target locations required either few attentional resources (“popout condition”) or an attention-demanding serial search (“non pop-out condition”). Participants were able to achieve high memory performance in all stimulation conditions but, in the non popout conditions, this came at the cost of additional processing time. Both empirical evidence and subjective reports suggest that participants invested the additional time in memorizing the locations of all target objects prior to the encoding of their shapes into WM. Thus, they seemed to be unable to interleave the steps of search with those of encoding. We propose that the memory for target locations substitutes for perceptual pop-out and thus may be the key component that allows for flexible coping with the common processing limitations of visual WM and attention. The findings have implications for understanding how we cope with real-life situations in which the demands on visual attention and WM occur simultaneously. Keywords: attention, working memory, interference, encoding strategies
Mit meisterhafter Präzision und einem zuverlässigen Gespür für das Außergewöhnliche seines Falles beschrieb Alois Alzheimer vor über 100 Jahren erstmals die feingeweblichen (histologischen) Veränderungen derjenigen Krankheit, die später seinen Namen tragen sollte. Gleichwohl konnte Alzheimer mithilfe des Mikroskops und der damals modernsten Färbetechniken nur wenig über den Zusammenhang zwischen den zu Lebzeiten des Patienten beobachteten Krankheitssymptomen und spezifischen Gehirnveränderungen aussagen. Heute ist zwar der histologische Befund noch immer für die zuverlässige Sicherung der Diagnose Morbus Alzheimer notwendig, aber moderne Schnittbild- sowie elektrophysiologische Verfahren erlauben es erstmals, neuroanatomische und neurofunktionelle Veränderungen zu Lebzeiten der Patienten zu erfassen. Neben ihrem unverzichtbaren Einsatz in der Ausschlussdiagnostik anderer schwerwiegender Gehirnerkrankungen wie Blutungen, Schlaganfälle und Tumore eröffnen diese Verfahren der klinischen Psychiatrie aufregende neue Forschungsperspektiven.
Das Altenpflegeheim ist für die Heimbewohner einerseits ihr Zuhause, andererseits wird es aber von vielen alten Menschen als der erzwungene Daueraufenthalt bis zum Lebensende empfunden. Dies ruft in den Beziehungen zwischen Heimbewohnern, ihren Angehörigen und den Pflegenden oftmals Spannungen hervor, die das zentrale Recht der Bewohnerinnen und Bewohner, aber auch das zentrale Anliegen der Pflegenden tangieren: die Erhaltung und Förderung der Selbstbestimmtheit des alten Menschen. Viele der betroffenen Heimbewohner sind vor allem aufgrund von Demenzerkrankungen unterschiedlicher Genese nicht mehr einwilligungsfähig. Dennoch äußern sie durch Gestik und Mimik in recht differenzierter Weise ihre Freude, ihre Vorlieben, ihre Ängste und ihren Unwillen. So zeigen sie oftmals, ob sie einer therapeutischen oder pflegerischen Maßnahme zustimmen oder sie ablehnen. Diese außerordentlich schwer zu interpretierenden Willensäußerungen sind zweifellos eine erhebliche Herausforderung, die nur in Kooperation aller Beteiligten gelöst werden kann.
Rheumatoid arthritis (RA) is a chronic inflammatory disease with a heritability of 60%. Genetic contributions to RA are made by multiple genes, but only a few gene associations have yet been confirmed. By studying animal models, reduced capacity of the NADPH-oxidase (NOX) complex, caused by a single nucleotide polymorphism (SNP) in one of its components (the NCF1 gene), has been found to increase severity of arthritis. To our knowledge, however, no studies investigating the potential role played by reduced reactive oxygen species production in human RA have yet been reported. In order to examine the role played by the NOX complex in RA, we investigated the association of 51 SNPs in five genes of the NOX complex (CYBB, CYBA, NCF4, NCF2, and RAC2) in a Swedish case-control cohort consisting of 1,842 RA cases and 1,038 control individuals. Several SNPs were found to be mildly associated in men in NCF4 (rs729749, P = 0.001), NCF2 (rs789181, P = 0.02) and RAC2 (rs1476002, P = 0.05). No associations were detected in CYBA or CYBB. By stratifying for autoantibody status, we identified a strong association for rs729749 (in NCF4) in autoantibody negative disease, with the strongest association detected in rheumatoid factor negative men (CT genotype versus CC genotype: odds ratio 0.34, 95% confidence interval 0.2 to 0.6; P = 0.0001). To our knowledge, this is the first genetic association identified between RA and the NOX complex, and it supports previous findings from animal models of the importance of reactive oxygen species production capacity to the development of arthritis.
The human amygdala is thought to play a pivotal role in the processing of emotionally significant sensory information. The major subdivisions of the human amygdala—the laterobasal group (LB), the superficial group (SF), and the centromedial group (CM)—have been anatomically delineated, but the functional response properties of these amygdala subregions in humans are still unclear. We combined functional MRI with cyto-architectonically defined probabilistic maps to analyze the response characteristics of amygdala subregions in subjects presented with auditory stimuli. We found positive auditory stimulation-related signal changes predominantly in probabilistically defined LB, and negative responses predominantly in SF and CM. In the left amygdala, mean response magnitude in the core area of LB with 90–100% assignment probability was significantly larger than in the core areas of SF and CM. These differences were observed for pleasant and unpleasant stimuli. Our findings reveal that the probabilistically defined anatomical subregions of the human amygdala show distinctive fMRI response patterns. The stronger auditory responses in LB as compared with SF and CM may reflect a predominance of auditory inputs to human LB, similar to many animal species in which the majority of sensory, including auditory, afferents project to this subdivision of the amygdala. Our study indicates that the intrinsic functional differentiation of the human amygdala may be probed using fMRI combined with probabilistic anatomical maps.
The MR signal is sensitive to diffusion. This effect can be increased by the use of large, balanced bipolar gradients. The gradient systems of MR scanners are calibrated at installation and during regular servicing visits. Because the measured apparent diffusion constant (ADC) depends on the square of the amplitude of the diffusion sensitizing gradients, errors in the gradient calibration are exaggerated. If the error is varying among the different gradient axes, it will affect the estimated degree of anisotropy. To assess the gradient calibration accuracy in a whole-body MRI scanner, ADC values were calculated for a uniform water phantom along each gradient direction while monitoring the temperature. Knowledge of the temperature allows the expected diffusion constant of water to be calculated independent of the MRI measurement. It was found that the gradient axes (±x, ±y, ±z) were calibrated differently, resulting in offset ADC values. A method is presented to rescale the amplitude of each of the six principal gradient axes within the MR pulse sequence. The scaling factor is the square root of the ratio of the expected and observed diffusion constants. In addition, fiber tracking results in the human brain were noticeably affected by improving the gradient system calibration. Magn Reson Med 58:763–768, 2007. © 2007 Wiley-Liss, Inc. Keywords: diffusion tensor imaging, apparent diffusion constant, magnetic field gradient, fibre tracking, anisotropy
It has often been proposed that regions of the human parietal and/or frontal lobe may modulate activity in visual cortex, for example, during selective attention or saccade preparation. However, direct evidence for such causal claims is largely missing in human studies, and it remains unclear to what degree the putative roles of parietal and frontal regions in modulating visual cortex may differ. Here we used transcranial magnetic stimulation (TMS) and functional magnetic resonance imaging (fMRI) concurrently, to show that stimulating right human intraparietal sulcus (IPS, at a site previously implicated in attention) elicits a pattern of activity changes in visual cortex that strongly depends on current visual context. Increased intensity of IPS TMS affected the blood oxygen level–dependent (BOLD) signal in V5/MT+ only when moving stimuli were present to drive this visual region, whereas TMS-elicited BOLD signal changes were observed in areas V1–V4 only during the absence of visual input. These influences of IPS TMS upon remote visual cortex differed significantly from corresponding effects of frontal (eye field) TMS, in terms of how they related to current visual input and their spatial topography for retinotopic areas V1–V4. Our results show directly that parietal and frontal regions can indeed have distinct patterns of causal influence upon functional activity in human visual cortex. Key words: attention, frontal cortex, functional magnetic resonance imaging, parietal cortex, top--down, transcranial magnetic stimulation
Although the concept that dendritic cells (DCs) recognize pathogens through the engagement of Toll-like receptors is widely accepted, we recently suggested that immature DCs might sense kinin-releasing strains of Trypanosoma cruzi through the triggering of G-protein-coupled bradykinin B2 receptors (B2R). Here we report that C57BL/6.B2R-/- mice infected intraperitoneally with T. cruzi display higher parasitemia and mortality rates as compared to B2R+/+ mice. qRT-PCR revealed a 5-fold increase in T. cruzi DNA (14 d post-infection [p.i.]) in B2R-/- heart, while spleen parasitism was negligible in both mice strains. Analysis of recall responses (14 d p.i.) showed high and comparable frequencies of IFN-gamma-producing CD4+ and CD8+ T cells in the spleen of B2R-/- and wild-type mice. However, production of IFN-gamma by effector T cells isolated from B2R-/- heart was significantly reduced as compared with wild-type mice. As the infection continued, wild-type mice presented IFN-gamma-producing (CD4+CD44+ and CD8+CD44+) T cells both in the spleen and heart while B2R-/- mice showed negligible frequencies of such activated T cells. Furthermore, the collapse of type-1 immune responses in B2R-/- mice was linked to upregulated secretion of IL-17 and TNF-alpha by antigen-responsive CD4+ T cells. In vitro analysis of tissue culture trypomastigote interaction with splenic CD11c+ DCs indicated that DC maturation (IL-12, CD40, and CD86) is controlled by the kinin/B2R pathway. Further, systemic injection of trypomastigotes induced IL-12 production by CD11c+ DCs isolated from B2R+/+ spleen, but not by DCs from B2R-/- mice. Notably, adoptive transfer of B2R+/+ CD11c+ DCs (intravenously) into B2R-/- mice rendered them resistant to acute challenge, rescued development of type-1 immunity, and repressed TH17 responses. Collectively, our results demonstrate that activation of B2R, a DC sensor of endogenous maturation signals, is critically required for development of acquired resistance to T. cruzi infection. Author Summary: Antibodies and IFN-gamma-producing effector T cells are essential for the immune control of infection by Trypanosoma cruzi, the intracellular protozoa that causes human Chagas disease. Despite the potency of anti-parasite immunity, the parasites are not cleared from their intracellular niches. Instead, a low grade chronic infection prevails, provoking severe immunopathology in the myocardium. Although it is well established that innate sentinel cells sense T. cruzi through receptors for microbial structures, such as Toll-like receptors, it remained unclear whether endogenous inflammatory signals also contribute to the development of adaptive immunity. The present study was motivated by awareness that T. cruzi trypomastigotes (extracellular infective forms) are equipped with proteases that liberate the pro-inflammatory bradykinin peptide from an internal segment of kininogens. Here we demonstrate that splenic dendritic cells (DCs), the antigen-presenting cells that coordinate the adaptive branch of immunity in lymphoid tissues, are potently activated via G-protein-coupled bradykinin B2 receptors (B2R). Analysis of the outcome of infection in B2R-knockout mice revealed that the mutant mice developed a typical susceptible phenotype, owing to impaired development of IFN-gamma-producing effector T cells. Notably, the immune dysfunction of B2R-knockout mice was corrected upon cell transfer of wild-type DCs, thus linking development of protective T cells to DCs' sensing of endogenous danger signals (kinins) released by trypomastigotes.
In the European Union (EU), health policy and the institutional reform of health systems have been treated primarily as national affairs, and health care systems within the EU thus differ considerably. However, the health policy field is undergoing a dynamic process of Europeanization. This process is stimulated by the orientation towards a more competitive economy, recently inaugurated and known as the Lisbon Strategy, while the regulatory requirements of the European Economic and Monetary Union are stimulating the Europeanization of health policy. In addition, the so-called open method of coordination, representing a new mode of regulation within the European multi-level system, is applied increasingly to the health policy area. Diverse trends are thus emerging. While the Lisbon Strategy goes along with a strategic upgrading of health policy more generally, health policy is increasingly used to strengthen economic competitiveness. Pressure on Member States is expected to increase to contain costs and promote market-based health care provision.
Consequences of altered eicosanoid patterns for nociceptive processing in mPGES-1-deficient mice
(2007)
Cyclooxygenase-2 (COX-2)-dependent prostaglandin (PG) E2 synthesis in the spinal cord plays a major role in the development of inflammatory hyperalgesia and allodynia. Microsomal PGE2 synthase-1 (mPGES-1) isomerizes COX-2-derived PGH2 to PGE2. Here, we evaluated the effect of mPGES-1-deficiency on the noci-ceptive behavior in various models of nociception that depend on PGE2 synthesis. Surprisingly, in the COX-2-dependent zymosan-evoked hyperalgesia model, the nociceptive behavior was not reduced in mPGES-1-deficient mice despite a marked decrease of the spinal PGE2 synthesis. Similarly, the nociceptive behavior was unaltered in mPGES-1-deficient mice in the formalin test. Importantly, spinal cords and primary spinal cord cells derived from mPGES-1-deficient mice showed a redirection of the PGE2 synthesis to PGD2, PGF2α and 6-keto-PGF1α (stable metabolite of PGI2). Since the latter prostaglandins serve also as mediators of noci-ception they may compensate the loss of PGE2 synthesis in mPGES-1-deficient mice.
Viele Patienten, die zum Radiologen geschickt werden, um eine Röntgenaufnahme ihrer Lunge machen zu lassen, fragen besorgt: Aber die Röntgenstrahlen sind doch schädlich, muss das denn wirklich sein? Solche Einwände kommen selbst von langjährigen Rauchern und Menschen, die ansonsten bereit sind, gesundheitliche Gefährdungen auf sich zu nehmen. Bald könnte es jedoch eine Alternative zur Röntgenuntersuchung der Lunge geben. In der Abteilung Pneumologie des Universitätsklinikums Frankfurt wird derzeit ein Verfahren zur bildhaften Darstellung der Lunge erprobt, das sich an den Luftschwingungen in der Lunge orientiert und ganz auf Röntgenstrahlen verzichtet.
Background: The evaluation of local mental health care remains difficult. For this reason systematic development of appropriate services is barely possible.
Methods: We examined involuntary hospitalization in the city of Frankfurt/Main with regard to diagnoses, socio-demographic data, complementary psychosocial outpatient care, and circumstances of hospitalization. There are four psychiatric clinics, each serving a catchment area of more than 165.000 inhabitants. These clinics are responsible for all psychiatric in-patient treatments regardless of the admission modus. During a one year period, 677 patients were involuntarily hospitalized. Statistical analyses were performed subsequent to pooling the data.
Results: During a period of one year, 103 out of 100.000 inhabitants of Frankfurt/Main were admitted involuntarily. The rate of involuntary admissions related to all admissions was 10.98 percent. Any complementary psychosocial care was missing in more than 70 percent of patients admitted involuntarily. Only about 10 percent of patients were examined by a physician before reaching the hospital and in disappointing 1.3 percent the municipal mental health service had been consulted prior to involuntarily admission.
Conclusion: Our results show that a systematic improvement of precautionary complementary psychosocial care for risk patients is needed as well as the obligation of psychiatric emergency consultation before involuntary hospitalization.
Background: Chronic congestive heart failure (CHF) is a complex disease with rising prevalence, compromised quality of life (QoL), unplanned hospital admissions, high mortality and therefore high burden of illness. The delivery of care for these patients has been criticized and new strategies addressing crucial domains of care have been shown to be effective on patients' health outcomes, although these trials were conducted in secondary care or in highly organised Health Maintenance Organisations. It remains unclear whether a comprehensive primary care-based case management for the treating general practitioner (GP) can improve patients' QoL. Methods/Design: HICMan is a randomised controlled trial with patients as the unit of randomisation. Aim is to evaluate a structured, standardized and comprehensive complex intervention for patients with CHF in a 12-months follow-up trial. Patients from intervention group receive specific patient leaflets and documentation booklets as well as regular monitoring and screening by a prior trained practice nurse, who gives feedback to the GP upon urgency. Monitoring and screening address aspects of disease-specific selfmanagement, (non)pharmacological adherence and psychosomatic and geriatric comorbidity. GPs are invited to provide a tailored structured counselling 4 times during the trial and receive an additional feedback on pharmacotherapy relevant to prognosis (data of baseline documentation). Patients from control group receive usual care by their GPs, who were introduced to guidelineoriented management and a tailored health counselling concept. Main outcome measurement for patients' QoL is the scale physical functioning of the SF-36 health questionnaire in a 12-month follow-up. Secondary outcomes are the disease specific QoL measured by the Kansas City Cardiomyopathy questionnaire (KCCQ), depression and anxiety disorders (PHQ-9, GAD-7), adherence (EHFScBS and SANA), quality of care measured by an adapted version of the Patient Chronic Illness Assessment of Care questionnaire (PACIC) and NTproBNP. In addition, comprehensive clinical data are collected about health status, comorbidity, medication and health care utilisation. Discussion: As the targeted patient group is mostly cared for and treated by GPs, a comprehensive primary care-based guideline implementation including somatic, psychosomatic and organisational aspects of the delivery of care (HICMAn) is a promising intervention applying proven strategies for optimal care. Trial registration: Current Controlled Trials ISRCTN30822978.
Background The arterial in line application of the leukocyte inhibition module (LIM) in the cardiopulmonary bypass (CPB) limits overshooting leukocyte activity during cardiac surgery. We now studied in a porcine model whether LIM may have beneficial effects on cardiac function after CPB. Methods German landrace pigs underwent CPB (60 min myocardial ischemia; 30 min reperfusion)without (group I; n=6) or with LIM (group II; n=6). The cardiac indices (CI) and cardiac function were analyzed pre and post CPB with a Swan-Ganz catheter and the cardiac function analyzer. Neutrophil labeling with technetium, scintigraphy, and histological analyses were done to track activated neutrophils within the organs. Results LIM prevented CPB-associated increase of neutrophil counts in peripheral blood. In group I, the CI significantly declined post CPB (post: 3.26 +/- 0.31; pre: 4.05 +/- 0.45 l/min/m2; p<0.01). In group II, the CI was only slightly reduced (post: 3.86 +/- 0.49; pre 4.21 +/- 1.32 l/min/m2; p=0.23). Post CPB, the intergroup difference showed significantly higher CI values in the LIM group (p<0.05) which was in conjunction with higher pre-load independent endsystolic pressure volume relationship (ESPVR) values (group I: 1.57 +/- 0.18; group II: 1.93 +/- 0.16; p<0.001). Moreover, the systemic vascular resistance and pulmonary vascular resistance were lower in the LIM group. LIM appeared to accelerate the sequestration of hyperactivated neutrophils in the spleen and to reduce neutrophil infiltration of heart and lung. Conclusions Our data provide strong evidence that LIM improves perioperative hemodynamics and cardiac function after CPB by limiting neutrophil activity and inducing accelerated sequestration of neutrophils in the spleen.
Psoriasis vulgaris is a common and chronic inflammatory skin disease which has the potential to significantly reduce the quality of life in severely affected patients. The incidence of psoriasis in Western industrialized countries ranges from 1.5 to 2%. Despite the large variety of treatment options available, patient surveys have revealed insufficient satisfaction with the efficacy of available treatments and a high rate of medication non-compliance. To optimize the treatment of psoriasis in Germany, the Deutsche Dermatologische Gesellschaft and the Berufsverband Deutscher Dermatologen (BVDD) have initiated a project to develop evidence-based guidelines for the management of psoriasis. The guidelines focus on induction therapy in cases of mild, moderate, and severe plaque-type psoriasis in adults. The short version of the guidelines reported here consist of a series of therapeutic recommendations that are based on a systematic literature search and subsequent discussion with experts in the field; they have been approved by a team of dermatology experts. In addition to the therapeutic recommendations provided in this short version, the full version of the guidelines includes information on contraindications, adverse events, drug interactions, practicality, and costs as well as detailed information on how best to apply the treatments described (for full version, please see Nast et al., JDDG, Suppl 2:S1–S126, 2006; or http://www.psoriasis-leitlinie.de).
Adverse events triggered by non-steroidal anti-inflammatory drugs (NSAIDs) are among the most common drug-related intolerance reactions in medicine; they are possibly related to inhibition of cyclooxygenase-1. Coxibs, preferentially inhibiting cyclooxygenase-2, may therefore represent safe alternatives in patients with NSAID intolerance. We reviewed the literature in a systematic and structured manner to identify and evaluate studies on the tolerance of coxibs in patients with NSAID intolerance. We searched MEDLINE (1966–2006), the COCHRANE LIBRARY (4th Issue 2006) and EMBASE (1966–2006) up to December 9, 2006, and analysed all publications included using a predefined evaluation sheet. Symptoms and severity of adverse events to coxibs were analysed based on all articles comprising such information. Subsequently, the probability for adverse events triggered by coxibs was determined on analyses of double-blind prospective trials only. Among 3,304 patients with NSAID intolerance, 119 adverse events occurred under coxib medication. All adverse events, except two, have been allergic/urticarial in nature; none was lethal, but two were graded as life-threatening (grade 4). The two non-allergic adverse events were described as a grade 1 upper respiratory tract haemorrhage, and a grade 1 gastrointestinal symptom, respectively. In 13 double-blind prospective studies comprising a total of 591 patients with NSAID intolerance, only 13 adverse reactions to coxib provocations were observed. The triggering coxibs were rofecoxib (2/286), celecoxib (6/208), etoricoxib (4/56), and valdecoxib (1/41). This review documents the good tolerability of coxibs in patients with NSAID intolerance, for whom access to this class of drugs for short-term treatment of pain and inflammation is advantageous.
cGMP- and cAMP-dependent protein kinases (cGK and cAK) mediate the inhibitory effects of endothelium-derived messenger molecules nitric oxide and prostacyclin on platelets. To understand the mechanisms involved in platelet inhibition we searched for new substrates of cGK and cAK. We identified Rap1GAP2, the only GTPase-activating protein of Rap1 in platelets. Rap1 is a guanine-nucleotide binding protein that controls integrin activity, platelet adhesion and aggregation. Rap1GAP2 is required to turn over Rap1-GTP to Rap1-GDP resulting in the inactivation of integrins and reduced cellular adhesion. Using phospho-specific antibodies we demonstrate phosphorylation of endogenous Rap1GAP2 on serine 7 by cGK and cAK in intact platelets. Yeast-two-hybrid screening revealed an interaction of the phosphoserine/-threonine binding adapter protein 14-3-3 with Rap1GAP2, and we mapped the 14-3-3 binding site to the N-terminus of Rap1GAP2 close to the cGK/cAK phosphorylation site. We could show that 14-3-3 binding to Rap1GAP2 requires phosphorylation of serine 9. Platelet activation by ADP and thrombin treatment induces Rap1GAP2 serine 9 phosphorylation and enhances the attachment of 14-3-3 to Rap1GAP2. In contrast, phosphorylation of serine 7 by cGK/cAK leads to the detachment of 14-3-3. Furthermore, Rap1GAP2 serine 7 phosphorylation correlates with the inhibition of Rap1-GTP formation by cGMP and cAMP in platelets. Cell adhesion experiments provide additional evidence that Rap1GAP2 is activated by the detachment of 14-3-3. Point mutants of Rap1GAP2 deficient in 14-3-3 binding inhibit Rap1-mediated cell adhesion significantly stronger than a Rap1GAP2 mutant that binds 14-3-3 constitutively. Our findings define a novel regulatory mechanism that might contribute to both platelet activation and endothelial inhibition of platelet adhesion and aggregation.
Bypassing of DNA lesions by damage-tolerant DNA polymerases depends on the interaction of these enzymes with the monoubiquitylated form of the replicative clamp protein, PCNA. We have analyzed the contributions of ubiquitin and PCNA binding to damage bypass and damage-induced mutagenesis in Polymerase {eta} (encoded by RAD30) from the budding yeast Saccharomyces cerevisiae. We report here that a ubiquitin-binding domain provides enhanced affinity for the ubiquitylated form of PCNA and is essential for in vivo function of the polymerase, but only in conjunction with a basal affinity for the unmodified clamp, mediated by a conserved PCNA interaction motif. We show that enhancement of the interaction and function in damage tolerance does not depend on the ubiquitin attachment site within PCNA. Like its mammalian homolog, budding yeast Polymerase {eta} itself is ubiquitylated in a manner dependent on its ubiquitin-binding domain.
Background: West Nile virus (WNV) infection can cause severe meningitis and encephalitis in humans. Apoptosis was recently shown to contribute to the pathogenesis of WNV encephalitis. Here, we used WNV-infected glioma cells to study WNV-replication and WNV-induced apoptosis in human brain-derived cells. Results: T98G cells are highly permissive for lytic WNV-infection as demonstrated by the production of infectious virus titre and the development of a characteristic cytopathic effect. WNV replication decreased cell viability and induced apoptosis as indicated by the activation of the effector caspase-3, the initiator caspases-8 and -9, poly(ADP-ribose)polymerase (PARP) cleavage and the release of cytochrome c from the mitochondria. Truncation of BID indicated cross-talk between the extrinsic and intrinsic apoptotic pathways. Inhibition of the caspases-8 or -9 inhibited PARP cleavage, demonstrating that both caspases are involved in WNV-induced apoptosis. Pancaspase inhibition prevented WNV-induced apoptosis without affecting virus replication. Conclusions: We found that WNV infection induces cell death in the brain-derived tumour cell line T98G by apoptosis under involvement of constituents of the extrinsic as well as the intrinsic apoptotic pathways. Our results illuminate the molecular mechanism of WNV-induced neural cell death.
Die Vermittlung der Zusammenhänge zwischen psychologischen Funktionen und körperlichen Veränderungen sowie deren Relevanz für die Entstehung und Aufrechterhaltung von Krankheiten stellt ein zentrales Ziel der Ausbildung in Medizinischer Psychologie dar. Zur Veranschaulichung dieser Zusammenhänge führten wir ein Psychophysiologie-Praktikum im ersten vorklinischen Semester ein. Die Studierenden führten in Vierergruppen mit Hilfe ausführlicher schriftlicher Instruktionen jeweils ca. 30 Minuten andauernde praktische Übungen durch, die die folgenden Themen behandelten: (1) Stress (abhängige Variable: Herzrate), (2) "Lügendetektor" (abhängige Variable: Hautleitwertsreaktionen), (3) Biofeedback (abhängige Variable: Hauttemperatur) und (4) Elektroenzephalogramm (abhängige Variable: Amplituden der vier klassischen Frequenzbänder). Die praktischen Übungen wurden durch theoretische Gruppenarbeiten und einen Termin zur Zusammenfassung der Ergebnisse der Übungen ergänzt. Die studentische Evaluation des Praktikums war durchweg positiv. So wurde das Praktikum als Bereicherung des Kurses angesehen, und der selbstbeurteilte Kenntnisstand auf dem Gebiet der Psychophysiologie zeigte eine signifikante Verbesserung. Diese Ergebnisse sowie unsere Eindrücke während des Praktikums bekräftigten unseren Entschluss, ein Psychophysiologie-Praktikum als Teil des Kurses der Medizinischen Psychologie und Medizinischen Soziologie fest zu etablieren.
Keine Bevölkerungsgruppe wächst so schnell wie die Gruppe der über 80-jährigen, 2050 werden es in Deutschland voraussichtlich zehn Millionen Menschen sein. Ganz ähnlich wie in vielen anderen Ländern auf allen Kontinenten, mit Ausnahme von Afrika. Aber ist die Medizin auf diese unausweichliche Entwicklung vorbereitet? »Noch nicht,« sagt Privatdozent Dr. Rupert Püllen, Altersmediziner und Chefarzt der Medizinisch-Geriatrischen Klinik der Frankfurter Diakonie- Kliniken. »Die Geriatrie führt unter den vielfältigen medizinischen Fachdisziplinen noch immer ein Schattendasein. Es mangelt an ausgebildeten Altersmedizinern ebenso wie an verlässlichen wissenschaftlichen Daten, aus denen sich evidenzbasierte Behandlungsstrategien für diese Altersgruppe ableiten lassen.« ...
Im Jahr 1906 beschrieb Alois Alzheimer (1864 – 1915) erstmals krankhafte Eiweißablagerungen im Gehirn einer Patientin, bei der er einige Jahre zuvor eine Demenz diagnostiziert hatte. Diese Ablagerungen machte er für den geistigen Abbau verantwortlich. Über die zugrunde liegenden biologischen Ursachen der Krankheit (»Ätiologie«) konnte der Frankfurter Arzt jedoch nur Vermutungen anstellen. Inzwischen weiß man, dass die Gene mit darüber entscheiden, ob jemand im Alter an Alzheimer-Demenz (AD) erkrankt. Bei der seltener auftretenden familiären Form der AD sind die verantwortlichen Gene inzwischen bekannt. Doch auch bei der häufigeren sporadischen Form der Krankheit konnten verschiedene Arbeitsgruppen, einschließlich unserer eigenen, inzwischen einige »Risiko-Gene« identifizieren. Eine Erkrankung des Gehirns Aufbauend auf den Befunden von Alois Alzheimer beschäftigten sich in der zweiten Hälfte des 20. Jahrhunderts immer mehr Forschergruppen mit der Alzheimer-Krankheit. ...
Psychische Störungen überschreiten alle Grenzen – es gibt sie in allen Kulturen, zu allen Zeiten, in allen soziodemografischen Schichten und in jedem Lebensalter. Sie sind häufige Themen sowohl in Talkshows, Fernsehserien und Illustrierten als auch in Literatur, Theater und bildender Kunst. Jeden können sie treffen, und beinahe jeder kennt zumindest eine Person, die an einer klinisch bedeutsamen psychischen Störung leidet. Zu deren Behandlung und Erforschung sowie zur Ausbildung von Psychologischen Psychotherapeuten wurde 1999 am Fachbereich Psychologie und Sportwissenschaften der Universität Frankfurt die Verhaltenstherapie-Ambulanz eingerichtet. Primäres Ziel der universitären Ambulanz ist dabei, die Forschung und Lehre des Fachs »Klinische Psychologie und Psychotherapie « mit der praktischen therapeutischen Arbeit an Klienten zusammenzuführen, um damit die Verbindung aus Forschung, Lehre, Ausbildung und Praxis herzustellen.
Background The Deltaretrovirus genus comprises viruses that infect humans (HTLV), various simian species (STLV) and cattle (BLV). HTLV-I is the main causative agent in adult T-cell leukemia in endemic areas and some of the simian T-cell lymphotropic viruses have been implicated in the induction of malignant lymphomas in their hosts. BLV causes enzootic bovine leukosis in infected cattle or sheep. During the past few years several new Deltaretrovirus isolates have been described in various primate species. Two new HTLV-like viruses in humans have recently been identified and provisionally termed HTLV-III and HTLV-IV. In order to identify a broad spectrum of Deltaretroviruses by a single PCR approach we have established a novel consensus PCR based on nucleotide sequence data obtained from 42 complete virus isolates (HTLV-I/-II, STLV-I/-II/-III, BLV). The primer sequences were based on highly interspecies-conserved virus genome regions. We used this PCR to detect Deltaretroviruses in samples from adult patients with a variety of rare T-cell neoplasms in Germany. Results: The sensitivity of the consensus PCR was at least between 10-2 and 10-3 with 100% specificity as demonstrated by serial dilutions of cell lines infected with either HTLV-I, HTLV-II or BLV. Fifty acute T-cell lymphoblastic leukemia (T-ALL) samples and 33 samples from patients with various rare mature T-cell neoplasms (T-PLL, Sezary syndrome and other T-NHL) were subsequently investigated. There were no cases with HTLV-I, HTLV-II or any other Deltaretroviruses. Conclusions: The results rule out a significant involvement of HTLV-I or HTLV-II in these disease entities and show that other related Deltaretroviruses are not likely to be involved. The newly established Deltaretrovirus PCR may be a useful tool for identifying new Deltaretroviruses.
Background A procedure for including activity against enveloped viruses in the post-contamination treatment of hands has been recommended, but so far no European standard is available to implement it. In 2004, the German Robert Koch-Institute (RKI) and the German Association for the Control of Virus Disease (DVV) suggested that vaccinia virus and bovine viral diarrhea virus (BVDV) should be used as test viruses in a quantitative suspension test to determine the activity of a disinfectant against all enveloped viruses. Methods We have studied the activities of three commonly-used alcohol-based hand rubs (hand rub A, based on 45% propan-2-ol, 30% propan-1-ol and 0.2% mecetronium etilsulfate; hand rub B, based on 80% ethanol; hand rub C, based on 95% ethanol) against vaccinia virus and BVDV, and in addition against four other clinically relevant enveloped viruses: herpes simplex virus (HSV) types 1 and 2, and human and avian influenza A virus. The hand rubs were challenged with different organic loads at exposure time of 15, 30 and 60 s. According to the guidelines of both BGA/RKI and DVV, and EN 14476:2005, the reduction of infectivity of each test virus was measured on appropriate cell lines using a quantitative suspension test. Results All three alcohol-based hand rubs reduced the infectivity of vaccinia virus and BVDV by >= 4 log10-steps within 15 s, irrespective of the type of organic load. Similar reductions of infectivity were seen against the other four enveloped viruses within 15 s in the presence of different types of organic load. Conclusions Commonly used alcohol-based hand rubs with a total alcohol concentration >= 75% can be assumed to be active against clinically relevant enveloped viruses if they effectively reduce the infectivities of vaccinia virus and BVDV in a quantitative suspension test.
Why is it hard to divide attention between dissimilar activities, such as reading and listening to a conversation? We used functional magnetic resonance imaging (fMRI) to study interference between simple auditory and visual decisions, independently of motor competition. Overlapping activity for auditory and visual tasks performed in isolation was found in lateral prefrontal regions, middle temporal cortex and parietal cortex. When the visual stimulus occurred during the processing of the tone, its activation in prefrontal and middle temporal cortex was suppressed. Additionally, reduced activity was seen in modality-specific visual cortex. These results paralleled impaired awareness of the visual event. Even without competing motor responses, a simple auditory decision interferes with visual processing on different neural levels, including prefrontal cortex, middle temporal cortex and visual regions.
Anderer Fehler sind gute Lehrer « – so lautet ein nur wenig bekanntes altes deutsches Sprichwort. Für medizinische Fehler galt das die längste Zeit nicht: entweder totgeschwiegen oder als »Kunstfehler « in das Licht der Öffentlichkeit gezerrt, entzogen sich ärztliche Fehler einer systematischen Analyse. Damit hat die Medizin lange eine wichtige Chance vertan. Am Institut für Allgemeinmedizin der Universität Frankfurt beschäftigt sich seit einigen Jahren ein Team unter Leitung von Prof. Dr. Ferdinand Gerlach intensiv mit der Fehlerforschung. ...
Poster presentation: Hyperphosphorylation of tau is a characteristic of Alzheimer's disease (AD). Our group has established a model for tau hyperphosphorylation by mutating 10 residues from Ser/Thr to Glu to simulate the negative charge of phosphorylated residues ("pseudohyperphosphorylated (PHP)-tau"). In order to analyze temporal and spatial effects of hyperphosphorylation of tau in a systemic context, we have established transgenic mouse lines that express human wild-type (wt)- or PHP-tau under the control of the CamKIIalpha-promoter that leads to a forebrain specific moderate expression in neurons, i.e. the region where also tau-pathology in AD is abundant. For the evaluation of tau-induced changes in the transgenic mice, we quantified spine densities in the neocortex and hippocampus of transgenic mice. The spine densitiy was significantly increased in PHP-tau compared to wt-tau expressing mice. It is known that AD is associated with aberrant pre- and postsynaptic sprouting. Axonal sprouting is also observed in transgenic mice expressing mutated amyloid precursor protein (APP), which suggests that Abeta plays a significant role in this process. We deduce from our results, that (pseudo)-hyperphosphorylation of tau is sufficient to induce aberrant sprouting in the absence of Abeta. Analyses whether this sprouting is induced by pre- or postsynaptic changes and if functionally active synapses are formed are in progress. It will be interesting to determine if stabilization of these newly formed synapses slows or – in contrary – accelerates the progression of the disease. Sprouting as observed in our PHP-tau expressing mice is part of neuronal differentiation. One family of enzymes that is involved in cell differentiation are mitogen-acitvated protein kinases (MAPK). Western blot analysis was performed with brain lysates from transgenic mice to check whether PHP-tau induced sprouting is associated with MAPK activation. In fact, we also observed an increased activation of the MAPK ERK1/2 evident by phosphorylation of the residues Thr202 and Tyr204. ERK1/2 is also known to phosphorylate tau at sites characteristic for AD. Our results suggest the presence of a vicious circle by which (pseudo)-hyperphosphorylated tau activates ERK1/2 which in turn phosphorylates tau.
Poster presentation: The transcription factor NF-kappaB plays a central role in the development and maintenance of the central nervous system and its constitutive activation in neurons has been repeatedly reported. Previous work from our laboratories (poster presentation: Compartimentalized NF-kappaB activity in the axon initial segment) had revealed an intriguing clustering of activated IKKalpha/beta and other downstream elements of an activated NF-kappaB cascade (phospho-IkappaBalpha, phospho-p65(Ser536)) in the axon initial segment (AIS). Accumulation of certain voltage-gated sodium channels (Na(v)1.2), M-type potassium channels (KCNQ2) as well as cytoskeletal anchoring proteins (AnkyrinG) characterise the AIS. However, it is not yet clear how AIS-localized IKK gets activated and whether this can be connected to the constitutive activation of NF-kappaB. Long-term blockade of sodium channels with tetrodotoxin, potassium-channels with linopirdine or NMDA-receptors with MK-801 did not elicit any change upon the constitutive activation of the pathway. Strikingly, the occurrence of phosphorylated IkappaBalpha was even unaltered by 24 h of incubation with protein synthesis inhibitors. Others have reported that impairment of NF-kappaB inhibits neuritogenesis. In this line we observed that the early initiation of IkappaBalpha phosphorylation was susceptible to inhibition of IKK in DIV1–2 neurons. We therefore aim to identify the interaction partners of the activated IKK complex in the AIS. Proteomic methods such as co-immunoprecipitation analyses and mass-spectrometry will help us to identify the key players in the initiation of constitutive IKK phosphorylation and activation in neurons.
Poster presentation: The mammalian pineal organ is a peripheral oscillator, depending on afferent information from the so-called master clock in the suprachiasmatic nuclei of the hypothalamus. One of the best studied outputs of the pineal gland is the small and hydrophobic molecule melatonin. In all vertebrates, melatonin is synthesized rhythmically with high levels at night, signalling the body the duration of the dark period. Changes or disruptions of melatonin rhythms in humans are related to a number of pathophysiological disorders, like Alzheimer's disease, seasonal affective disorder or the Smith-Magenis-Syndrome. To use melatonin in preventive or curative interferences with the human circadian system, a complete understanding of the generation of the rhythmic melatonin signal in the human pineal gland is essential. Melatonin biosynthesis is best studied in the rodent pineal gland, where the activity of the penultimate and rate-limiting enzyme, the arylalkylamine N-acetyltransferase (AA-NAT), is regulated on the transcriptional level, whereas the regulatory role of the ultimate enzymatic step, achieved by the hydroxyindole O-methyltransferase (HIOMT), is still under debate. In rodents, Aa-nat mRNA is about 100-fold elevated during the night in response to adrenergic stimulation of the cAMP-signalling pathway, with AA-NAT protein levels closely following this dynamics. In contrast, in all ungulates studied so far (cow, sheep), a post-transcriptional regulation of the AA-NAT is central to determine rhythmic melatonin synthesis. AA-NAT mRNA levels are constantly elevated, and lead to a constitutive up-regulation of AA-NAT protein, which is, however, rapidly degraded via proteasomal proteolysis during the day. AA-NAT proteolysis is only terminated upon the nocturnal increase in cAMP levels. Similar to ungulates, a post-transcriptional control of this enzyme seems evident in the pineal gland of the primate Macaca mulatta. Studies on the molecular basis of melatonin synthesis in the human being are sparse and almost exclusively based on phenomenological data, derived from non-invasive investigations. Yet the molecular mechanisms underlying the generation of the hormonal message of darkness can currently only be deciphered using autoptic material. We therefore analyzed in human post-mortem pineal tissue Aa-nat and Hiomt mRNA levels, AA-NAT and HIOMT enzyme activity, and melatonin levels for the first time simultaneously within tissue samples of the same specimen. Here presented data show the feasibility of this approach. Our results depict a clear diurnal rhythm in AA-NAT activity and melatonin content, despite constant values for Aa-nat and Hiomt mRNA, and for HIOMT activity. Notably, the here elevated AA-NAT activity during the dusk period does not correspond to a simultaneous elevation in melatonin content. It is currently unclear whether this finding may suggest a more important role of the ultimate enzyme in melatonin synthesis, the HIOMT, for rate-limiting the melatonin rhythm, as reported recently for the rodent pineal gland. Thus, our data support for the first time experimentally that post-transcriptional mechanisms are responsible for the generation of rhythmic melatonin synthesis in the human pineal gland.
Poster presentation: Light is the main phase-adjusting stimulus of the circadian clock located in the suprachiasmatic nucleus (SCN). A candidate pathway transmitting photic information at the postsynaptic site in the SCN is the extracellular signal-regulated kinase (ERK 1/2) which has been previously shown to be an essential element in the photoentrainment of the circadian rhythm. An upstream activator of the ERK signalling route is the small intracellular GTPase Ras. Here we observed that endogenous Ras activity in the SCN was subjected to rhythmic changes, reaching maximum levels at the late subjective day and minimum levels at the late subjective night (CT22). In order to investigate if Ras would modulate the circadian cycle, we used transgenic mice expressing constitutively activated Val-12 Ha-Ras selectively in neurons (synRas mice). In these mice Ras activity was also cycling during the circadian rhythm yet, Ras activities were up-regulated at each time point measured. We investigated if this change in Ras activity translates into a behavioral phenotype by monitoring free-running activity rhythms under conditions of constant darkness. SynRas mice exhibited circadian rhythms in locomotor activities similar to WT mice. However, when challenged by applying a 15 minutes light pulse at CT22 to promote phase advance shifts, synRas mice were completely non-responsive. As a first step towards the possible intracellular mechanism of this behavioral change we analyzed ERK1/2 activities in more details: We found a 1,7-fold increase of circadian peak levels of ERK 1/2 activities at CT10 and CT14 in synRas mice, while at minimum levels (CT18, CT22) no differences were found between ERK1/2 activities of WT and synRas mice. In WT animals the 15 minutes light pulse at CT22 resulted in rapid up regulations of Ras, ERK1/2 and CREB activities as described previously by others. However, in correlation with the lack of a behavioral response, ERK1/2 but not Ras and CREB activities remained unchanged in synRas mice, suggesting that Ras-dependent and Ras-independent pathways may co-exist to regulate ERK1/2 and behavioral phase shifts in response to the acute light treatment. Next we investigated the length "tau" of the locomotor activity rhythm during constant darkness and found a slight shortening by about 10 minutes in synRas mice as compared to the WT littermates. Recently, "tau" has been discussed to be modulated by the interaction between glycogen synthase 3beta (GSK3beta) and a clock gene product (Per 2) that is involved in the determination of circadian phase durations. We describe here a down-regulation of GSK3beta phosphorylation in synRas mice as a possible mechanism of "tau" shortening. Taken together, cycling of Ras activity at elevated levels in the SCN during the circadian rhythm results in a distinct pattern of behavioral phenotype changes correlating with de-regulated ERK1/2 or GSK3beta activities.
Poster presentation: The transcription factor NF-kappaB plays a pivotal role in the development and maintenance of the central nervous system and its constitutive activation in neurons has been previously reported. NF-kappaB is post-translationally activated upon phosphorylation of the IkappaBalpha inhibitory protein by the activated IkappaB kinase (IKKalpha/beta) and the subsequent degradation of IkappaBalpha by the proteasome. Recently, we had demonstrated an unexpected accumulation of three components of the NF-kappaB cascade in the axon initial segment (AIS): Activated IKK, phosphorylated IkappaBalpha and phosphorylated-p65(Ser536). These are all associated with detergent-insoluble cytoskeletal components of the AIS. We observed further compartimentalization as pIKKalpha/beta primarily associated with the membrane cytoskeleton, whereas pIkappaBalpha was sequestered to fasciculated microtubules. Colchicine-induced depolymerization of microtubules was associated with reduced sequestration of pIkappaBalpha in the AIS, which could be blocked by use of proteasome inhibitors like Mg-132 or Lactacystin. Concurrently, enhanced nuclear immunoreactivity for the NF-kappaB subunit p65 was noted. Using NF-kappaB-dependent reporter gene assays, a significant increase in NF-kappaB activity was observed after depolymerization of microtubules and this was inhibited by the microtubule-stabilizing drug paclitaxel. The use of transiently transfected, photoactivatable-GFP p65 fusion proteins will allow us to specifically analyse the compartimentalized signal transduction pathways in unique spatial and temporal resolution. Taken together, these observations provide strong evidence for compartmentalized activation of NF-kappaB in the AIS and modulation of neuronal NF-kappaB activity by microtubule dynamics.
Poster presentation: Here we investigated the role of the amyloid precursor protein (APP) in regulation of Ca2+ store depletion-induced neural cell death. Ca2+ store depletion from the endoplasmic reticulum (ER) was induced by the SERCA (Sarco/Endoplasmic Reticulum Calcium ATPase) inhibitor thapsigargin which led to a rapid induction of the unfolded protein response (UPR) and a delayed activation of executioner caspases in the cultures. Overexpression of APP potently enhanced cytosolic Ca2+ levels and cell death after ER Ca2+ store depletion in comparison to vector-transfected controls. GeneChipR and RT-PCR analysis revealed that the expression of classical UPR chaperone genes was not altered by overexpression of APP.Interestingly, the induction of the ER stress-responsive pro-apoptotic transcription factor CHOP was significantly upregulated in APP-overexpressing cells in comparison to vectortransfected controls. Chelation of intracellular Ca2+ with BAPTA-AM revealed that enhanced CHOP expression after store depletion occured in a Ca2+-dependent manner in APPoverexpressing cells. Prevention of CHOP induction by BAPTA-AM and by RNA interference was also able to abrogate the potentiating effect of APP on thapsigargin-induced apoptosis. Application of the store-operated channel (SOC)-inhibitors SK F96365 and 2-APB downmodulated APP-triggered potentiation of cytosolic Ca2+ levels and apoptosis after treatment with thapsigargin. Our data demonstrate that APP-mediated regulation of ER Ca2+ homeostasis significantly modulates Ca2+ store depletion-induced cell death in a SOC- and CHOP-dependent manner, but independent of the UPR.
Aims: To analyze the relationship between exposure to chlorinated and aromatic organic solvents and malignant lymphoma in a multi-centre, population-based case-control study.
Methods: Male and female patients with malignant lymphoma (n=710) between 18 and 80 years of age were prospectively recruited in six study regions in Germany (Ludwigshafen /Upper Palatinate, Heidelberg/ Rhine-Neckar-County, Wurzburg/ Lower Frankonia, Hamburg, Bielefeld/ Gutersloh, and Munich). For each newly recruited lymphoma case, a gender, region and age-matched (+/- 1 year of birth) population control was drawn from the population registers. In a structured personal interview, we elicited a complete occupational history, including every occupational period that lasted at least one year. On the basis of job task-specific supplementary questionnaires, a trained occupational physician assessed the exposure to chlorinated hydrocarbons (trichloroethylene, tetrachloroethylene, dichloromethane, carbon tetrachloride) and aromatic hydrocarbons (benzene, toluene, xylene, styrene). Odds ratios (OR) and 95% confidence intervals (CI) were calculated using conditional logistic regression analysis, adjusted for smoking (in pack years) and alcohol consumption. To increase the statistical power, patients with specific lymphoma subentities were additionally compared with the entire control group using unconditional logistic regression analysis.
Results: We observed a statistically significant association between high exposure to chlorinated hydrocarbons and malignant lymphoma (Odds ratio = 2.1; 95% confidence interval 1.1-4.3). In the analysis of lymphoma subentities, a pronounced risk elevation was found for follicular lymphoma and marginal zone lymphoma. When specific substances were considered, the association between trichloroethylene and malignant lymphoma was of borderline statistical significance. Aromatic hydrocarbons were not significantly associated with the lymphoma diagnosis.
Conclusions: In accordance with the literature, this data point to a potential etiologic role of chlorinated hydrocarbons (particularly trichloroethylene) and malignant lymphoma. Chlorinated hydrocarbons might affect specific lymphoma subentities differentially. Our study does not support a strong association between aromatic hydrocarbons (benzene, toluene, xylene, or styrene) and the diagnosis of a malignant lymphoma.
Purpose of the study: There is a clinical need for antiretroviral therapy (ART) regimens that simplify dosing and make adherence easier for specific patient groups such as former intravenous drug users (IVDU) receiving opiate substitution. Availability of tenofovir DF (TDF) and other once-daily (OD) agents could offer a viable OD regimen. The 3OD study was designed to evaluate the use of OD HAART in IVDU patients.
Methods: 3OD was a single-arm, multicentre, 48-weeks trial to assess efficacy, tolerability and adherence to a OD TDF-containing HAART regimen in former IVDU patients receiving opiate substitution. Of 67 patients enrolled, 27 were antiretroviral treatment naïve, 10 were virologically suppressed (<400 copies/mL), and 30 were re-starting HAART without prior virological failure. Opiate substitution was adjusted according to subject symptoms of opiate overdosing or withdrawal. Various methods were used to assess adherence: besides pill count, patients were asked to fill in a MASRI (Medication Adherence Self-Report Inventory) questionnaire and an electronic log pad diary. Calculation of adherence by pill count assumed that unreturned pills had been taken by the subjects.
Summary of results: Overall, 55% (n = 37, ITT, M = F) of patients had viral load <400 copies/mL at week 48. Using an ITT, M = E analysis, 90% (37/41) of patients reached undetectable VL (<400 copies/mL), 56% (23/41 patients) had plasma HIV-1 RNA concentrations <50 copies/mL at week 48. Only 30 patients (45%) completed the full study and the follow-up period. In 51% of patients, TDF adherence was >100% using pill count. MASRI showed adherence rates of 80–100% in 83–85% of patients; however, 15 patients never entered any data. Diary data were entered by 57 patients; diary data were entered for fewer days than patients received treatment (mean difference 113 days, calculated from treatment start and stop dates).
Conclusion: TDF in combination with other OD antiretrovirals in former IVDU patients showed comparable efficacy to that seen in the average HIV-1 infected population. However, measurement of adherence to self-administered HAART via pill count, MASRI or diary may be misleading in this population.
It has been recognized that molecular classifications will form the basis for neuropathological diagnostic work in the future. Consequently, in order to reach a diagnosis of Alzheimer's disease (AD), the presence of hyperphosphorylated tau (HP-tau) and beta-amyloid protein in brain tissue must be unequivocal. In addition, the stepwise progression of pathology needs to be assessed. This paper deals exclusively with the regional assessment of AD-related HP-tau pathology. The objective was to provide straightforward instructions to aid in the assessment of AD-related immunohistochemically (IHC) detected HP-tau pathology and to test the concordance of assessments made by 25 independent evaluators. The assessment of progression in 7-µm-thick sections was based on assessment of IHC labeled HP-tau immunoreactive neuropil threads (NTs). Our results indicate that good agreement can be reached when the lesions are substantial, i.e., the lesions have reached isocortical structures (stage V–VI absolute agreement 91%), whereas when only mild subtle lesions were present the agreement was poorer (I–II absolute agreement 50%). Thus, in a research setting when the extent of lesions is mild, it is strongly recommended that the assessment of lesions should be carried out by at least two independent observers.
Background: In Germany, 17% of 59,000 persons living with HIV/AIDS are female. Accordingly, the research focus in clinical studies as well as in cohort analyses has been almost exclusively on HIV-positive men. As a consequence, there is an urgent need to characterize and evaluate the outcome of HAART in HIV-positive women and to identify special requirements of this particular patient population.
Methods: Cross-sectional multicentre (n = 31 centres) evaluation to observe characteristics of 1,557 HIV-positive women receiving medical care in Germany between June 2007 and March 2008. Data acquisition was performed using standardized questionnaires.
Summary of results: Of 1,557 HIV-positive women studied, 1,191 (77%) received HAART. Mean age was 40 years and average time of known HIV-infection was 9 years. Risk of HIV transmission was: 40% heterosexual intercourse in Germany, 36% heterosexual intercourse in a high prevalence country; 17% IDU; 7% other reasons for transmission. 46% of the women had a migration background. Mean time on antiretroviral treatment was 7 years. 53% of the female participants had been treated with >2 HAART-regimens. 47% of the study subjects received a PI-based regimen, 33% a NNRTI-based regimen; 20% were on other combinations. The most commonly used PI and NNRTI were lopinavir/r and nevirapine, respectively. Only 48% of all women under HAART achieved a viral load <40 copies/ml. There was a significant difference between the PI-treated group with 44% patients <40 copies/ml and the NNRTI-treated group with 56% <40 copies/ml (p = 0.003).
Conclusion: We found that HIV-positive women depicted an inferior virological response to HAART compared to those previously published in German cohort analyses dominated by men (response rates >75%). Possible differences in adherence or drug resistance may have impacted these results and are currently being evaluated in ongoing sub-analyses. Of note, the lack of a study arm with male patients is a limitation of this investigation. However, this is partly off-set by the fact that there are good comparative data in the male population found in other cohorts. We conclude that our results are in discordance to the popular assumption that there are no gender specific differences in virological treatment outcome of HAART.
Background This study was carried out to compare the HRQoL of patients in general practice with differing chronic diseases with the HRQoL of patients without chronic conditions, to evaluate the HRQoL of general practice patients in Germany compared with the HRQoL of the general population, and to explore the influence of different chronic diseases on patients HRQoL, independently of the effects of multiple confounding variables. Methods A cross-sectional questionnaire survey including the SF-36, the EQ-5D and demographic questions was conducted in 20 general practices in Germany. 1009 consecutive patients aged 15–89 participated. The SF-36 scale scores of general practice patients with differing chronic diseases were compared with those of patients without chronic conditions. Differences in the SF-36 scale/summary scores and proportions in the EQ-5D dimensions between patients and the general population were analyzed. Independent effects of chronic conditions and demographic variables on the HRQoL were analyzed using multivariable linear regression and polynomial regression models. Results The HRQoL for general practice patients with differing chronic diseases tended to show more physical than mental health impairments compared with the reference group of patients without. Patients in general practice in Germany had considerably lower SF-36 scores than the general population (P < 0.001 for all) and showed significantly higher proportions of problems in all EQ-5D dimensions except for the self-care dimension (P < 0.001 for all). The mean EQ VAS for general practice patients was lower than that for the general population (69.2 versus 77.4, P < 0.001). The HRQoL for general practice patients in Germany seemed to be more strongly affected by diseases like depression, back pain, OA of the knee, and cancer than by hypertension and diabetes. Conclusion General practice patients with differing chronic diseases in Germany had impaired quality of life, especially in terms of physical health. The independent impacts on the HRQoL were different depending on the type of chronic disease. Findings from this study might help health professionals to concern more influential diseases in primary care from the patient´s perspective.
Meeting Abstract : Deutsche Gesellschaft für Chirurgie. 125. Kongress der Deutschen Gesellschaft für Chirurgie. Berlin, 22.-25.04.2008 Einleitung: Über 4 Millionen Menschen leben in Deutschland schätzungsweise mit chronischen Wunden. Aufgrund der demographischen Entwicklung unserer Gesellschaft ist mit einem weiteren Anstieg der zu nicht, oder nur zögerlich heilenden Wunden führenden Erkrankungen diabetisches Fußsyndrom, chronisch venöse Insuffizienz und pAVK auszugehen. Dennoch ist die moderne hydroaktive Wundbehandlung in Deutschland nicht flächendeckend etabliert. Gründe hierfür liegen unter anderem in dem unüberschaubaren Produktsortiment, der unzureichenden Vergütung vor allem im ambulanten Versorgungssektor und in der mangelhaften ärztlichen Ausbildung in Bezug auf Wundtherapie. Ein standardisiertes Wundbehandlungsschema erleichtert die stadiengerechte Anwendung moderner Wundauflagen und dient als nachvollziehbare Entscheidungsgrundlage in der Auswahl der erforderlichen Wundprodukte. Material und Methoden: Anhand eines Bogens werden vier Kriterien (Wundstadium, Wundexsudation, Wundtiefe und Wundinfektion) zur Beurteilung einer Wunde erfasst. Die fotographische Abbildung der verschiedenen Wundstadien erlaubt eine sichere visuelle Zuordnung durch den Therapeuten. Nach Analyse dieser S.E.T.I. Kriterien ergibt sich eine eindeutige stadiengerechte Produktzuordnung, die auch dem weniger geübten eine sichere Anwendung der verschiedenen Produktgruppen ermöglicht. Ergebnisse: Dieser Behandlungsstandard wurde zwischenzeitlich an 3 Kliniken der Maximalversorgung und in einem integrierten Versorgungsmodell zum diabetischen Fußsyndrom etabliert und stellt einen Bestandteil für ein weiteres IV Modell zur pAVK dar. Neben ökonomischen Vorteilen (reduzierte Lagerhaltungskosten, Straffung des Produktsortiments, günstigere Bezugskonditionen) lässt sich eine Verbesserung in der Behandlungsqualität, eine verkürzte stationäre Behandlungsdauer sowie eine vereinfachte Umsetzung einer sektorenübergreifenden Wundversorgung erzielen. Schlussfolgerung: Die Anwendung eines Therapiestandards für die stadiengerechte Behandlung chronischer Wunden ermöglicht eine Anwenderunabhängige gleich bleibend hohe Qualität sowie eine wesentlich vereinfachte Orientierung in dem Produktsortiment. Hierdurch wird weiterhin ein Beitrag zur Schnittstellenoptimierung zwischen dem stationären und ambulanten Versorgungssektor bei chronischen Wunden geleistet. Ein verbindlicher interdisziplinärer und interprofessioneller Wundbehandlungsstandard stellt eine unverzichtbare Qualitätssicherungsmaßnahme in der Wundbehandlung dar.
Infliximab is a monoclonal antibody directed against TNF-alpha. It has been approved for use in rheumatoid arthritis, ankylosing spondylitis, inflammatory bowel disease, psoriatic arthritis and plaque-type psoriasis. In case reports, positive effects on pustular variants of psoriasis have also been reported. However, paradoxically, manifestation of pustular psoriasis and plaque-type psoriasis has been reported in patients treated with TNF antagonists including infliximab for other indications. Here, we report on 5 patients with chronic plaque-type psoriasis who developed palmoplantar pustulosis during or after discontinuation of infliximab therapy. In two of the five cases, manifestation of palmoplantar pustulosis was not accompanied by worsening of plaque-type psoriasis. Possibly, site-specific factors or a differential contribution of immunological processes modulated by TNF inhibitors to palmoplantar pustulosis and plaque-type psoriasis may have played a role.
Background Brain-computer interface methodology based on self-regulation of slow-cortical potentials (SCPs) of the EEG (electroencephalogram) was used to assess conditional associative learning in one severely paralyzed, late-stage ALS patient. After having been taught arbitrary stimulus relations, he was evaluated for formation of equivalence classes among the trained stimuli. Methods A monitor presented visual information in two targets. The method of teaching was matching to sample. Three types of stimuli were presented: signs (A), colored disks (B), and geometrical shapes (C). The sample was one type, and the choice was between two stimuli from another type. The patient used his SCP to steer a cursor to one of the targets. A smiley was presented as a reward when he hit the correct target. The patient was taught A-B and B-C (sample – comparison) matching with three stimuli of each type. Tests for stimulus equivalence involved the untaught B-A, C-B, A-C, and C-A relations. An additional test was discrimination between all three stimuli of one equivalence class presented together versus three unrelated stimuli. The patient also had sessions with identity matching using the same stimuli. Results The patient showed high accuracy, close to 100%, on identity matching and could therefore discriminate the stimuli and control the cursor correctly. Acquisition of A-B matching took 11 sessions (of 70 trials each) and had to be broken into simpler units before he could learn it. Acquisition of B-C matching took two sessions. The patient passed all equivalence class tests at 90% or higher. Conclusion The patient may have had a deficit in acquisition of the first conditional association of signs and colored disks. In contrast, the patient showed clear evidence that A-B and B-C training had resulted in formation of equivalence classes. The brain-computer interface technology combined with the matching to sample method is a useful way to assess various cognitive abilities of severely paralyzed patients, who are without reliable motor control.
Bei Investigator Initiated Trials (IITs) werden alternative risikoadaptierte Monitoring-Strategien in Abhängigkeit vom individuellen Studiendesign und dem Risikoprofil diskutiert, um bei oft restriktiven Ressourcen eine den gesetzlichen Vorgaben genügende Qualität der Studiendurchführung und der Daten zu gewährleisten. Aufgrund einer Literaturanalyse sollten in der vorliegenden Arbeit Untersuchungen ausgewertet werden, in denen quantitative Aussagen zu Datenqualität und Prüfplan-Compliance in klinischen Prüfungen gemacht wurden. Bei der Interpretation der Ergebnisse sollten die implementierten Qualitätssicherungsmaßnahmen berücksichtigt werden. Aufgrund einer systematischen Recherche in MEDLINE konnten 21 Publikationen identifiziert werden, bei denen die Daten- und Prozessqualität in klinischen Prüfungen untersucht, die Qualität durch Überprüfungen mit Source Data Verification vor Ort oder Überprüfung übermittelter Quelldaten in der Studienzentrale ermittelt wurde und quantitative Informationen zu den Bereichen Datenqualität, Protokoll-Compliance oder Defizite bei Einwilligungserklärungen vorlagen. Die Mehrzahl der Untersuchungen ist drei Organisationen zuzuordnen: European Organization für Research and Treatment of Cancer (EORTC) (n=7), National Cancer Institute (NCI) (n=7) und Untersuchungen der Trans-Tasman Radiation Oncology Group (TROG) (n=4). Darüber hinaus wurden drei Untersuchungen weiterer Studiengruppen identifiziert. Die Untersuchungen wurden im Zeitraum von 1981 bis 2003 publiziert. Überwiegend wurden in der Literatur onkologische Studien betrachtet (n=19), wobei die Radiotherapie im Vordergrund stand (n=8). Für die EORTC-Studien wurde in der Regel eine gute Datenqualität berichtet (80-90% korrekte Daten). Punktuelle Probleme wurden im Hinblick auf die Protokoll-Compliance und das Berichten von Nebenwirkungen/schwerwiegenden unerwünschten Ereignissen festgestellt. Eine gute Qualität wurde ebenfalls bzgl. des korrekten Einschlusses von Patienten beobachtet. Durch das NCI wurde ein standardisiertes Audit-System eingeführt und innerhalb von kooperativen Studiengruppen implementiert. Im Rahmen dieser Audits wurden verschiedene Kriterien überprüft und eine überwiegend gute Datenqualität und Protokoll-Compliance festgestellt. Mängel wurden in ca. 5% der Fälle im Hinblick auf die Einwilligungserklärung, die korrekte Anwendung der Einschlusskriterien, Protokollverletzungen, bei der Ermittlung des Zielkriteriums, der Erfassung der Toxizität, der adäquaten Datenlieferung und bei der Datenverifikation beobachtet. In einzelnen Untersuchungen ergaben sich Probleme mit der Behandlungscompliance (10-20%), bei Protokollabweichungen im Hinblick auf die Arzneimitteldosis (10%) und bei der Drug Accountability (15%). Von der TROG wurde ein Qualitätssicherungsprozess implementiert, der auf zentralem Monitoring von kopierten Quelldaten basiert. Durch den Qualitätssicherungsansatz der TROG konnten schwerwiegende Probleme mit der Protokoll-Compliance unter 10% gesenkt werden, ebenso konnte eine gute Datenqualität mit einer Fehlerrate unter 5% erreicht werden. Die korrekte Handhabung von Ein- und Ausschlusskriterien stellte in Einzelfällen ein Problem dar. Zusammenfassend kann festgestellt werden, dass die in dem Review erfassten Studiengruppen von einer guten Datenqualität und einer guten bis moderaten Protokoll-Compliance berichten. Diese basiert nach Aussage der Autoren im wesentlichen auf etablierten Qualitätssicherungs-Prozeduren, wobei das durchgeführte Audit ebenfalls einen potentiellen Einflussfaktor darstellt. Geringe Probleme wurden in der Regel im Hinblick auf die Einwilligungserklärung, die korrekte Handhabung der Ein- und Ausschlusskriterien und die Datenqualität beobachtet. In einzelnen Studien gab es jedoch Probleme mit der Protokoll-Compliance. Insgesamt hängen Anzahl und Art der Mängel von dem Studientyp, dem Qualitätsmanagement und der Organisation der Studiengruppe ab. Wissenschaftsbetrug wurde nur in sehr wenigen Fällen durch die Audits festgestellt. Die vorgelegten Informationen beziehen sich nahezu ausschließlich auf etablierte Studiengruppen; bezüglich Datenqualität und Protokoll-Compliance außerhalb der Studiengruppen liegen kaum Informationen in der Literatur vor. Bei der Bewertung der Ergebnisse sollte berücksichtigt werden, dass es sich zum Teil um Eigenauswertungen der Studiengruppen und nicht um unabhängige externe Prüfungen (z.B. externe Audits) handelt. Inwieweit die Ergebnisse einer konsequenten Überprüfung nach derzeitigen Good Clinical Practice (GCP) – Regeln standhalten würden, kann aus der Analyse nicht beantwortet werden. Aus der vorliegenden Literaturanalyse ergeben sich Konsequenzen für die Planung einer prospektiven kontrollierten Studie zum Vergleich unterschiedlicher Monitoring-Strategien. Wesentlicher Einflussfaktor für die Datenqualität und Protokollcompliance in einer klinischen Studie ist das Qualitätsmanagement. Dieses Qualitätsmanagement umfasst neben Monitoring zahlreiche andere Maßnahmen. Um zu einer Bewertung von Monitoringstrategien kommen zu können, müssen daher alle Qualitätssicherungsmaßnahmen im Rahmen einer Studie berücksichtigt werden. Für den Vergleich unterschiedlicher Monitoringstrategien sind geeignete Zielparameter zu definieren (z.B. schwerwiegende Defizite bzgl. Ein- und Ausschlusskriterien, Sicherheit). Die vorliegende Analyse ergibt, dass bei gutem Qualitätsmanagement ohne umfassendes vor Ort Monitoring schwerwiegende Fehler nur mit relativ niedriger Häufigkeit festgestellt wurden. Unterschiede zwischen Monitoringstrategien könnten, gegeben ein funktionierendes Qualitätsmanagementssystem, sich als quantitativ gering erweisen. Testet man auf Äquivalenz von Monitoringstrategien, sind nur niedrige Differenzen zu akzeptieren, was wiederum eine Auswirkung auf die Fallzahlplanung hat. Weiterhin muss berücksichtigt werden, dass zur Feststellung der Auswirkung unterschiedlicher Monitoringstrategien auf die Sicherheit der Patienten und die Validität der Daten im Rahmen einer kontrollierten Untersuchung ein unabhängiges Audit notwendig ist. Dabei ist zu berücksichtigen, dass ein Audit bereits einen möglichen Einflussfaktor für die Datenqualität und Protokoll-Compliance darstellen kann, und damit eine Bewertung des Nutzens einer Monitoringstrategie erschwert werden könnte. Schlüsselwörter: systematisches Review, Datenqualität, Protokoll-Compliance, klinische Studie
Poster presentation: Purpose of the study The aim of the Rainbow Cohort is to assess the tolerability and efficacy of initiating treatment with, or switching treatment to the saquinavir (SQV) 500 mg film-coated tablet formulation. We present the final 48-week subgroup analysis of PI-experienced, but SQV-naïve patients. ...
Poster presentation: Purpose of the study The aim of the Rainbow Cohort is to assess the tolerability and efficacy of initiating treatment with, or switching treatment to saquinavir (SQV) 500 mg film-coated tablet formulation. We present the final 48-week subgroup analysis of antiretroviral therapy (ART)-naïve patients. ...
Hintergrund: Für die Forschung mit Routinedaten sind Kenntnisse zum Entstehungsprozess sowie zur Validität der Daten Voraussetzung. Ziel der Studie war es, die valide Erfassung forschungsrelevanter Informationen in Arzneimittelroutinedaten zwischen Betäubungsmittel (BtM)-Rezepten und Muster-16-Rezepten (für sonstige Arzneimittel) zu vergleichen.
Methodik: Grundlage waren Routinedaten der Gmünder ErsatzKasse (GEK) aus dem Jahr 2006. Aus den 7,2 Mio. Rezepten wurde eine einfache Zufallsstichprobe von 600 Muster 16 und 600 BtM-Rezepten gezogen. Die eingescannten Originalbelege wurden gesichtet und mit den in Routinedaten befindlichen Informationen verglichen. Die Angaben auf dem Rezept dienten als Goldstandard.
Ergebnisse: Insgesamt ist auf BtM-Rezepten sowohl das Verordnungsdatum (68,1% vs. 92,5%; p<0,0001) wie auch das Abgabedatum (61,8% vs. 85,5%; p<0,0001) schlechter erfasst als auf Muster-16-Rezepten. Auffällig sind die großen Unterschiede zwischen den Apothekenrechenzentren. Die Verrechnungsstelle der Süddeutschen Apotheken GmbH (VSA) als größtes Apothekenrechenzentrum lieferte, im Vergleich zu allen anderen Apothekenrechenzentren, beim Verordnungsdatum (56,1% vs. 73,3%; p<0,0001) wie auch beim Abgabedatum (41,2% vs. 70,8%; p<0,0001) von BtM-Rezepten auffällig seltener korrekte Ergebnisse. Fehler beim Abgabedatum waren bei der VSA assoziiert mit den in den Routinedaten verfügbaren Variablen Art des Rezeptes (Betäubungsmittelrezept vs. Muster 16; Odds Ratio [OR]: 3,12; 95% Konfidenzintervall [KI]: 1,85–5,27), Abgabe laut Routinedaten am Verordnungstag (Ja vs. Nein; OR: 9,33; 95% KI: 1,78–48,87) sowie Verordnung laut Routinedaten am 5., 15. oder 25. (Ja vs. Nein; OR: 6,70; 95% KI: 2,85–15,76).
Schlussfolgerung: Es besteht für hiesige Routinedaten ein erheblicher Mangel an methodisch fundierten Analysen bzw. Validierungsstudien, insbesondere auch zur Güte von Diagnosen.
Since 2002, a workshop entitled “Asthma in animal models” has been held once a year in Hannover, Germany. It is organized by the Fraunhofer Institute of Toxicology and Experimental Medicine in collaboration with the collaborative research centre “Sonderforschungsbereich” 587, “Immune reactions of the lung in infection and allergy” (Hannover Medical School). The aim of these meetings is an intense scientific exchange between researchers and clinicians coming from academic or industrial background. Over the years the topics within the extensive field of asthma and COPD have ranged from methodological aspects to the influence of infections and environmental factors up to perspectives in the development of new therapeutic strategies.
Owing to higher performance on the Raven’s Progressive Matrices (RPM) than on the Wechsler Intelligence Scales (WIS), it has recently been argued that intelligence is underestimated in autism. This study examined RPM and WIS IQs in 48 individuals with autism, a mixed clinical (n = 28) and a neurotypical (n = 25) control group. Average RPM IQ was higher than WIS IQ only in the autism group, albeit to a much lesser degree than previously reported and only for individuals with WIS IQs <85. Consequently, and given the importance of reliable multidimensional IQ estimates in autism, the WIS are recommended as first choice IQ measure in high functioning individuals. Additional testing with the RPM might be required in the lower end of the spectrum.
Background Enhanced activity of histone deacetylases (HDAC) is associated with more aggressive tumour behaviour and tumour progression in various solid tumours. The over-expression of these proteins and their known functions in malignant neoplasms has led to the development of HDAC inhibitors (HDI) as new anti-neoplastic drugs. However, little is known about HDAC expression in renal cell cancer. Methods We investigated the expression of HDAC 1, 2 and 3 in 106 renal cell carcinomas and corresponding normal renal tissue by immunohistochemistry on tissue micro arrays and correlated expression data with clinico-pathological parameters including patient survival. Results Almost 60% of renal cell carcinomas expressed the HDAC isoforms 1 and 2. In contrast, HDAC 3 was only detected in 13% of all renal tumours, with particular low expression rates in the clear cell subtype. HDAC 3 was significantly higher expressed in pT1/2 tumours in comparison to pT3/4 tumours. Expression of class I HDAC isoforms correlated with each other and with the proliferative activity of the tumours. We found no prognostic value of the expression of any of the HDAC isoforms in this tumour entity. Conclusion Class I HDAC isoforms 1 and 2 are highly expressed in renal cell cancer, while HDAC 3 shows low, histology dependent expression rates. These unexpected differences in the expression patterns suggests alternative regulatory mechanisms of class I HDACs in renal cell cancer and should be taken into account when trials with isoform selective HDI are being planned. Whether HDAC expression in renal cancers is predictive of responsiveness for HDI will have to be tested in further studies.
Background The EGF receptor has been shown to internalize via clathrin-independent endocytosis (CIE) in a ligand concentration dependent manner. From a modeling point of view, this resembles an ultrasensitive response, which is the ability of signaling networks to suppress a response for low input values and to increase to a pre-defined level for inputs exceeding a certain threshold. Several mechanisms to generate this behaviour have been described theoretically, the underlying assumptions of which, however, have not been experimentally demonstrated for the EGF receptor internalization network. Results Here, we present a mathematical model of receptor sorting into alternative pathways that explains the EGF-concentration dependent response of CIE. The described mechanism involves a saturation effect of the dominant clathrin-dependent endocytosis pathway and implies distinct steady-states into which the system is forced for low vs high EGF stimulations. The model is minimal since no experimentally unjustified reactions or parameter assumptions are imposed. We demonstrate the robustness of the sorting effect for large parameter variations and give an analytic derivation for alternative steady-states that are reached. Further, we describe extensibility of the model to more than two pathways which might play a role in contexts other than receptor internalization. Conclusions Our main result is that a scenario where different endocytosis routes consume the same form of receptor corroborates the observation of a clear-cut, stimulus dependent sorting. This is especially important since a receptor modification discriminating between the pathways has not been found. The model is not restricted to EGF receptor internalization and might account for ultrasensitivity in other cellular contexts.
Introduction To investigate the predictive value of clinical and biological markers for a pathological complete remission after a preoperative dose-dense regimen of doxorubicin and docetaxel, with or without tamoxifen, in primary operable breast cancer. Methods Patients with a histologically confirmed diagnosis of previously untreated, operable, and measurable primary breast cancer (tumour (T), nodes (N) and metastases (M) score: T2-3(>= 3 cm) N0-2 M0) were treated in a prospectively randomised trial with four cycles of dose-dense (bi-weekly) doxorubicin and docetaxel (ddAT) chemotherapy, with or without tamoxifen, prior to surgery. Clinical and pathological parameters (menopausal status, clinical tumour size and nodal status, grade, and clinical response after two cycles) and a panel of biomarkers (oestrogen and progesterone receptors, Ki-67, human epidermal growth factor receptor 2 (HER2), p53, bcl-2, all detected by immunohistochemistry) were correlated with the detection of a pathological complete response (pCR). Results A pCR was observed in 9.7% in 248 patients randomised in the study and in 8.6% in the subset of 196 patients with available tumour tissue. Clinically negative axillary lymph nodes, poor tumour differentiation, negative oestrogen receptor status, negative progesterone receptor status, and loss of bcl-2 were significantly predictive for a pCR in a univariate logistic regression model, whereas in a multivariate analysis only the clinical nodal status and hormonal receptor status provided significantly independent information. Backward stepwise logistic regression revealed a response after two cycles, with hormone receptor status and lymph-node status as significant predictors. Patients with a low percentage of cells stained positive for Ki-67 showed a better response when treated with tamoxifen, whereas patients with a high percentage of Ki-67 positive cells did not have an additional benefit when treated with tamoxifen. Tumours overexpressing HER2 showed a similar response to that in HER2-negative patients when treated without tamoxifen, but when HER2-positive tumours were treated with tamoxifen, no pCR was observed. Conclusion Reliable prediction of a pathological complete response after preoperative chemotherapy is not possible with clinical and biological factors routinely determined before start of treatment. The response after two cycles of chemotherapy is a strong but dependent predictor. The only independent factor in this subset of patients was bcl-2. Trial registration number NCT00543829
The indications for allogeneic stem cell transplantation (SCT) in Acute Myeloid Leukemia (AML) represent a real challenge due to the clinical and genetic heterogeneity of the disorder. Therefore, an optimized indication for SCT in AML first requires the determination of the individual relapse risk based on diverse chromosomal and molecular prognosis-defining aberrations. A broad panel of diagnostic methods is needed to allow such subclassification and prognostic stratification: cytomorphology, cytogenetics, molecular genetics, and immunophenotyping by multiparameter flow cytometry. These methods should not be seen as isolated techniques but as parts of an integral network with hierarchies and interactions. Examples for a poor risk constellation as a clear indication for allogeneic SCT are provided by anomalies of chromosome 7, complex aberrations, or FLT3-length mutations. In contrast, the favorable reciprocal translocations such as the t(15;17)/PML-RARA or t(8;21)/AML1-ETO are not indications for SCT in first remission due to the rather good prognosis after standard therapy. Further, the indication for SCT should include the results of minimal residual disease (MRD) diagnostics by polymerase chain reaction (PCR) or flow cytometry. New aspects for a safe and fast risk stratification as basis for an optimized indication for SCT in AML might be provided by novel technologies such as microarray-based gene expression profiling. Keywords: Acute Myeloid Leukemia (AML), Allogeneic Stem Cell Transplantation (SCT), Indication, Cytogenetics, Polymerase Chain Reaction (PCR)
Seit dem Sommersemester 2006 führt der Fachbereich Medizin der J. W. Goethe – Universität kontinuierlich eine Analyse über den Zusammenhang der Oberstufen- und Abiturprüfungsnoten mit den Studiumserfolgen bei den Frankfurter Medizinstudierenden durch. Den Rahmen hierfür bildet das Projekt Studierendenauswahl zur Identifizierung und Validierung geeigneter Prädiktoren des Studienerfolgs zur universitären Auswahl (60 Prozent der Studiumsplätze in den ZVS-Fächern unterliegen der direkten Vergabekompetenz der Hochschulen). Wir präsentieren in dieser Kommunikation die Ergebnisse einer retrospektiven Datenerhebung bei den Studierenden im klinischen Studienabschnitt, welche Kurse zur Erlangung der Hochschulreife ausgewählt wurden (n=700). Hintergrund für dieses Vorgehen ist die Vermutung, dass zwischen der Kurswahl und dem Studienerfolg ein unmittelbarer Zusammenhang besteht. Die Studienleistungen wurden auf der Basis von fachbereichseigenen Prüfungen (vorklinische und klinische Leistungsnachweise) durch die Ergebnisse in den Staatsexamina identifiziert. Des Weiteren sollte geklärt werden, wie viele Leistungskurskombinationen – bedingt durch die Vorgaben des deutschen Oberstufensystems – vorliegen. Erste Auswertungen geben zu erkennen, dass die Korrelation zwischen den erreichten Punkten der individuellen Schulfächer (Mathematik, Biologie, Chemie, Deutsch und Englisch) und den Ergebnissen im 1.Abschnitt der ärztlichen Prüfung deutlich fachabhängig sind. Das Gleiche gilt für die Leistungskurswahl: Die große Anzahl verschiedener Leistungskurskombinationen (bei 700 Studierenden über 80) zeigt ausgesprochen variable Korrelationen mit den Leistungen im 1. Abschnitt der Ärztlichen Prüfung. Dabei ist die Leistungskurskombination Mathematik + Englisch nach unserer gegenwärtigen Analyse der beste Prädiktor für Erfolg im Medizinstudium. Diese Ergebnisse könnten in naher Zukunft als Basis des universitären Auswahlverfahrens für Medizinstudierende dienen.
Meeting Abstract : Deutsche Gesellschaft für Chirurgie. 125. Kongress der Deutschen Gesellschaft für Chirurgie. Berlin, 22.-25.04.2008 Einleitung: Die Resektion von Lebermetastasen kolorektaler Karzinome stellt die einzige potentiell kurative Behandlungsoption dar. Wirksame Chemotherapeutika wie Oxaliplatin und Irinotecan sind in den Verdacht geraten durch histologische Veränderungen an der Leber das Resektionsausmass oder das Outcome von vorbehandelten Patienten zu gefährden.Die vorliegende Studie untersucht daher den Grad der Steatohepatitis bei Patienten mit kolorektalen Lebermetastasen in Abhängigkeit von der Chemotherapie. Material und Methoden: In einem Kollektiv von 100 konsekutiven Patienten (08/2002 bis 02/2006) (chemonaiv: n=32, 62,4 +/- 13,3 Jahre; neoadjuvante Chemotherapie: n=39, 62 +/- 10,2 Jahre und adjuvante Chemotherapie: n=29, 61,2 +/- 10,8 Jahre) wurde aus den intraoperativ gewonnenen Leberresektaten retrospektiv der NAFLD-Score nach Kleiner et al. (Hepatology 2005) erhoben. Zur morphologischen Beurteilung wurde die Hämatoxilin-Eosin-Färbung verwendet, während der Fibrosegrad anhand der Ladewig-Färbung und der Siderosegrad mittels der Berliner-Blau-Färbung bestimmt wurden.Anschließend erfolgte eine statische Analyse der Häufigkeit und Relevanz der Steatohepatitis in den einzelnen Gruppen im Hinblick auf Verlauf und Outcome der Leberresektion. Hierbei wurden multivariate Regression, Kruskal-Wallis-Test, chi2-Test oder Mann-Whitney-U-Test (p<0,05) verwendet. Ergebnisse: Im vorliegenden Patientengut zeigten 7 Patienten eine ausgeprägte NASH, während bei 69% der Patienten keinerlei Veränderungen im Sinne einer NASH vorlagen. Die subjektive Gesamtbeurteilung der Pathologen und der errechnete NASH-Score eine Übereinstimmung in 92%. (Cohen´s kappa 0,82; 95%-Konfidenzintervall [0,71-0,93]). Hinsichtlich des NASH-Score (p=0,462) oder seiner Komponenten konnten keine Unterschiede in Abhängigkeit vom Zeitpunkt der Chemotherapie (Chemonaiv/ neoadjuvant/ adjuvant) gefunden werden. Eine Analyse in Abhängigkeit der verwendeten Chemotherapeutika zeigte keine Unterschiede für den Gesamt-Score (p=0,897), jedoch signifikante Unterschiede für einzelne Komponenten: Portale Entzündung (p=0,045) und Vorliegen von Microgranulomen (p<0,001). Auch eine multivariate Analyse konnte weder den Einfluss von Substanz noch Zeitpunkt der Chemotherapie auf die Entwicklung einer NASH (p zwischen 0,35 und 0,92) nachweisen.Die Analyse des perioperativen Verlaufs (Transfusionsbedarf, Radikalität, Komplikationen, Liegedauer, postoperative Leberfunktion, Krankenhausmortalität) ergab keine signifikanten Unterschiede für Patienten mit oder ohne NASH. Schlussfolgerung: Das Vorliegen einer Steatohepatitis in unserem Patientengut war eine seltene Diagnose, die nicht in Zusammenhang mit Zeitpunkt der Chemotherapie oder verwendetem Chemotherapeutikum stand. Selbst das Vorliegen einer NASH scheint keinen relevanten Einfluss auf den perioperativen Verlauf oder das Outcome nach Leberresektion zu haben.
Background Osseointegration is crucial for the long-term success of dental implants and depends on the tissue reaction at the tissue-implant interface. Mechanical properties and biocompatibility make zirconia a suitable material for dental implants, although surface processings are still problematic. The aim of the present study was to compare osteoblast behavior on structured zirconia and titanium surfaces under standardized conditions. Methods The surface characteristics were determined by scanning electron microscopy (SEM). In primary bovine osteoblasts attachment kinetics, proliferation rate and synthesis of bone-associated proteins were tested on different surfaces. Results The results demonstrated that the proliferation rate of cells was significantly higher on zirconia surfaces than on titanium surfaces (p < 0.05; Student's t-test). In contrast, attachment and adhesion strength of the primary cells was significant higher on titanium surfaces (p < 0.05; U test). No significant differences were found in the synthesis of bone-specific proteins. Ultrastructural analysis revealed phenotypic features of osteoblast-like cells on both zirconia and titanium surfaces. Conclusion The study demonstrates distinct effects of the surface composition on osteoblasts in culture. Zirconia improves cell proliferation significantly during the first days of culture, but it does not improve attachment and adhesion strength. Both materials do not differ with respect to protein synthesis or ultrastructural appearance of osteoblasts. Zirconium oxide may therefore be a suitable material for dental implants.
Background Titanium and titanium alloys are widely used for fabrication of dental implants. Since the material composition and the surface topography of a biomaterial play a fundamental role in osseointegration, various chemical and physical surface modifications have been developed to improve osseous healing. Zirconia-based implants were introduced into dental implantology as an altenative to titanium implants. Zirconia seems to be a suitable implant material because of its tooth-like colour, its mechanical properties and its biocompatibility. As the osseointegration of zirconia implants has not been extensively investigated, the aim of this study was to compare the osseous healing of zirconia implants with titanium implants which have a roughened surface but otherwise similar implant geometries. Methods Forty-eight zirconia and titanium implants were introduced into the tibia of 12 minipigs. After 1, 4 or 12 weeks, animals were sacrificed and specimens containing the implants were examined in terms of histological and ultrastructural techniques. Results Histological results showed direct bone contact on the zirconia and titanium surfaces. Bone implant contact as measured by histomorphometry was slightly better on titanium than on zirconia surfaces. However, a statistically significant difference between the two groups was not observed. Conclusion The results demonstrated that zirconia implants with modified surfaces result in an osseointegration which is comparable with that of titanium implants.
Background The successful use of zirconia ceramics in orthopedic surgery led to a demand for dental zirconium-based implant systems. Because of its excellent biomechanical characteristics, biocompatibility, and bright tooth-like color, zirconia (zirconium dioxide, ZrO2) has the potential to become a substitute for titanium as dental implant material. The present study aimed at investigating the osseointegration of zirconia implants with modified ablative surface at an ultrastructural level. Methods A total of 24 zirconia implants with modified ablative surfaces and 24 titanium implants all of similar shape and surface structure were inserted into the tibia of 12 Gottinger minipigs. Block biopsies were harvested 1 week, 4 weeks or 12 weeks (four animals each) after surgery. Scanning electron microscopy (SEM) analysis was performed at the bone implant interface. Results Remarkable bone attachment was already seen after 1 week which increased further to intimate bone contact after 4 weeks, observed on both zirconia and titanium implant surfaces. After 12 weeks, osseointegration without interposition of an interfacial layer was detected. At the ultrastructural level, there was no obvious difference between the osseointegration of zirconia implants with modified ablative surfaces and titanium implants with a similar surface topography. Conclusion The results of this study indicate similar osseointegration of zirconia and titanium implants at the ultrastructural level.