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Institute
- Medizin (2648) (remove)
Background: SAMHD1 mediates resistance to anti-cancer nucleoside analogues, including cytarabine, decitabine, and nelarabine that are commonly used for the treatment of leukaemia, through cleavage of their triphosphorylated forms. Hence, SAMHD1 inhibitors are promising candidates for the sensitisation of leukaemia cells to nucleoside analogue-based therapy. Here, we investigated the effects of the cytosine analogue CNDAC, which has been proposed to be a SAMHD1 inhibitor, in the context of SAMHD1. Methods: CNDAC was tested in 13 acute myeloid leukaemia (AML) cell lines, in 26 acute lymphoblastic leukaemia (ALL) cell lines, ten AML sublines adapted to various antileukaemic drugs, 24 single cell-derived clonal AML sublines, and primary leukaemic blasts from 24 AML patients. Moreover, 24 CNDAC-resistant sublines of the AML cell lines HL-60 and PL-21 were established. The SAMHD1 gene was disrupted using CRISPR/Cas9 and SAMHD1 depleted using RNAi, and the viral Vpx protein. Forced DCK expression was achieved by lentiviral transduction. SAMHD1 promoter methylation was determined by PCR after treatment of genomic DNA with the methylation-sensitive HpaII endonuclease. Nucleoside (analogue) triphosphate levels were determined by LC-MS/MS. CNDAC interaction with SAMHD1 was analysed by an enzymatic assay and by crystallisation. Results: Although the cytosine analogue CNDAC was anticipated to inhibit SAMHD1, SAMHD1 mediated intrinsic CNDAC resistance in leukaemia cells. Accordingly, SAMHD1 depletion increased CNDAC triphosphate (CNDAC-TP) levels and CNDAC toxicity. Enzymatic assays and crystallisation studies confirmed CNDAC-TP to be a SAMHD1 substrate. In 24 CNDAC-adapted acute myeloid leukaemia (AML) sublines, resistance was driven by DCK (catalyses initial nucleoside phosphorylation) loss. CNDAC-adapted sublines displayed cross-resistance only to other DCK substrates (e.g. cytarabine, decitabine). Cell lines adapted to drugs not affected by DCK or SAMHD1 remained CNDAC sensitive. In cytarabine-adapted AML cells, increased SAMHD1 and reduced DCK levels contributed to cytarabine and CNDAC resistance. Conclusion: Intrinsic and acquired resistance to CNDAC and related nucleoside analogues are driven by different mechanisms. The lack of cross-resistance between SAMHD1/ DCK substrates and non-substrates provides scope for next-line therapies after treatment failure.
Cancer therapies have experienced significant advances in recent years. While conventional cytotoxic chemotherapy has long been the cornerstone for the treatment of many tumor entities, uprising immunotherapies have revolutionized the therapeutic landscape. Among them, immune checkpoint inhibitors (ICIs) with their demonstrated increased overall survival rates and response rates in cancer patients are now FDA-approved for metastatic melanoma and multiple other malignancies. Despite their clinical benefit in cancer therapies, ICIs can induce unique autoimmune-like toxicities known as immune-related adverse events (irAEs), which can involve any organ system including the nervous system. Although neurotoxicities are rare complications of ICI therapy they are often severe and can lead to long-term disability or even death if left untreated.
Neurological irAEs exhibit a broad spectrum of clinical presentations affecting the entire nervous system. Diagnosing neurological irAEs is often challenging as symptoms and laboratory findings can be uncharacteristic for common neurological disorders and clinical experience with ICI-mediated toxicities is still limited. In light of expanding clinical indications for ICIs, physicians will encounter ICI-mediated neurotoxicities more frequently. Thus, thorough characterizations of the diverse set of neurological irAEs are essential for optimal patient care, the prevention of severe ICI-mediated complications, and the development of diagnostic and therapeutic algorithms. This work portrays the clinical presentation, management and outcome of neurological irAEs following ICI therapies.
Patients with neurotoxicities related to ICIs who presented at the Yale New Haven Hospital between January 2014 and June 2018 were retrospectively identified from the quality control database. A comprehensive chart review was performed and data regarding patient demographics, medical history, ICI regimen and neurotoxicity were recorded. In total, 18 patients with neurological irAEs following ICI therapy for melanoma, small cell lung cancer, non-small cell lung cancer, and Merkel-cell carcinoma were identified. Neurotoxicities included central nervous system disorders comprising central demyelinating disorder,autoimmune encephalitis predominantly affecting the grey matter, and aseptic meningitis. Peripheral nervous system toxicities included sensorimotor polyneuropathy and myasthenia gravis. Cases of hypophysitis were also recorded. Time to onset of neurological irAEs ranged from 1 to72 weeks with a median of five weeks. In all patients ICIs were held and steroids initiated. Additional immunomodulatory therapies were required in nine patients. Sixteen of 18 patients showed neurological improvement. Fourteen patients had highgrade neurotoxicity (grade 3-4), six of whom deceased due to cancer progression, while none of the low-grade neurotoxicity patients (grade 1-2) died. High-grade neurotoxicity was identified as a negative prognostic marker for overall survival (p = 0.046).
This work shows that neurotoxicities present early-onset, rapidly progressive complications of ICIs with a broad spectrum of clinical phenotypes affecting the central nervous system, peripheral nervous system, and neuroendocrine system. A high index of caution for neurological irAEs is warranted throughout ICI therapy as timely diagnosis and management can reduce morbidity and mortality. Randomized clinical trials are needed to develop standardized diagnostic and therapeutic algorithms of ICI-induced neurotoxicities.
Transcatheter left atrial appendage occlusion (LAAO) is non-inferior to vitamin K antagonists (VKAs) in preventing thromboembolic events in atrial fibrillation (AF). Non-vitamin K antagonists (NOACs) have an improved safety profile over VKAs; however, evidence regarding their effect on cardiovascular and neurological outcomes relative to LAAO is limited. Up-to-date randomized trials or propensity-score-matched data comparing LAAO vs. NOACs in high-risk patients with AF were pooled in our study. A total of 2849 AF patients (LAAO: 1368, NOACs: 1481, mean age: 75 ± 7.5 yrs, 63.5% male) were enrolled. The mean CHA2DS2-VASc score was 4.3 ± 1.7, and the mean HAS-BLED score was 3.4 ± 1.2. The baseline characteristics were comparable between the two groups. In the LAAO group, the success rate of device implantation was 98.8%. During a mean follow-up of 2 years, as compared with NOACs, LAAO was associated with a significant reduction of ISTH major bleeding (p = 0.0002). There were no significant differences in terms of ischemic stroke (p = 0.61), ischemic stroke/thromboembolism (p = 0.63), ISTH major and clinically relevant minor bleeding (p = 0.73), cardiovascular death (p = 0.63), and all-cause mortality (p = 0.71). There was a trend toward reduction of combined major cardiovascular and neurological endpoints in the LAAO group (OR: 0.84, 95% CI: 0.64–1.11, p = 0.12). In conclusion, for high-risk AF patients, LAAO is associated with a significant reduction of ISTH major bleeding without increased ischemic events, as compared to “contemporary NOACs”. The present data show the superior role of LAAO over NOACs among high-risk AF patients in terms of reduction of major bleeding; however, more randomized controlled trials are warranted.
Simple Summary: The role of transcriptionally deregulated miRNAs (microRNAs) in classical Hodgkin lymphoma (cHL) is still not fully understood. To address this issue, we have performed global miRNA expression profiling of commonly used cHL cell lines and we present a complete cHL miRNome (microRNome). Within this group, we identify miRNAs recurrently deregulated in cHL cell lines, and compare them to non-Hodgkin lymphoma cell lines and sorted normal CD77+ germinal centre B-cells. Moreover, we show that several of the recurrently overexpressed miRNAs in cHL cell lines, and also primary microdissected HRS (Hodgkin and Reed-Sternberg) cells, target known B-cell-related transcription factors and NF-κB inhibitors. These findings provide evidence that deregulated miRNAs contribute to the loss of B-cell phenotype and NF-κB activation observed in this lymphoma.
Abstract: A hallmark of classical Hodgkin lymphoma (cHL) is the attenuation of B-cell transcription factors leading to global transcriptional reprogramming. The role of miRNAs (microRNAs) involved in this process is poorly studied. Therefore, we performed global miRNA expression profiling using RNA-seq on commonly used cHL cell lines, non-Hodgkin lymphoma cell lines and sorted normal CD77+ germinal centre B-cells as controls and characterized the cHL miRNome (microRNome). Among the 298 miRNAs expressed in cHL, 56 were significantly overexpressed and 23 downregulated (p < 0.05) compared to the controls. Moreover, we identified five miRNAs (hsa-miR-9-5p, hsa-miR-24-3p, hsa-miR-196a-5p, hsa-miR-21-5p, hsa-miR-155-5p) as especially important in the pathogenesis of this lymphoma. Target genes of the overexpressed miRNAs in cHL were significantly enriched (p < 0.05) in gene ontologies related to transcription factor activity. Therefore, we further focused on selected interactions with the SPI1 and ELF1 transcription factors attenuated in cHL and the NF-ĸB inhibitor TNFAIP3. We confirmed the interactions between hsa-miR-27a-5p:SPI1, hsa-miR-330-3p:ELF-1, hsa-miR-450b-5p:ELF-1 and hsa-miR-23a-3p:TNFAIP3, which suggest that overexpression of these miRNAs contributes to silencing of the respective genes. Moreover, by analyzing microdissected HRS cells, we demonstrated that these miRNAs are also overexpressed in primary tumor cells. Therefore, these miRNAs play a role in silencing the B-cell phenotype in cHL.
Introduction: Cancer patients tend to prefer oral instead of parenteral chemotherapy. To date, there is little evidence on the medication adherence in cancer patients. We investigated medication adherence to tyrosine kinase inhibitors in patients suffering from non-small cell lung cancer. Methods: Tyrosine kinase inhibitor adherence was measured electronically by MEMS® (medication event monitoring system) over at least six months. Adherence rates were calculated in terms of Dosing Compliance, Timing Compliance, Taking Compliance, and Drug Holidays. Patients were dichotomized as adherent when Dosing Compliance and Timing Compliance were ≥80%, Taking Compliance ranged between 90 and 110%, and <1 Drug Holiday was registered. Quality of life was assessed by two questionnaires (EORTC QLQ-C30 version 3.0, EORTC QLQ-LC13) at three time points. Adverse drug events were reported via patient diaries. Results: Out of 32 patients enrolled, data from 23 patients were evaluable. Median Dosing Compliance, Taking Compliance, and Timing Compliance adherence rates of tyrosine kinase inhibitor intake amounted to 100%, 98%, and 99%, respectively; Drug Holidays were observed in three patients. Four patients were dichotomized as non-adherent. Three of them had a twice-daily tyrosine kinase inhibitor regimen. Median quality of life scores amounted to 67 (max. 100) and remained unchanged over the study period. Fatigue and rash were the most frequently reported adverse drug events. Conclusion: Medication adherence of non-small cell lung cancer patients treated with tyrosine kinase inhibitors was extraordinarily high and is likely to support the effectiveness of tyrosine kinase inhibitor treatment and a good quality of life over a long period of time. Adherence facilitating information and education is especially relevant for patients taking tyrosine kinase inhibitors in a twice-daily regimen.
Preeclampsia (PE), a gestational hypertensive disease originating from the placenta, is characterized by an imbalance of various cellular processes. The cell cycle regulator p21Cip1/CDKN1A (p21) and its family members p27 and p57 regulate signaling pathways fundamental to placental development. The aim of the present study was to enlighten the individual roles of these cell cycle regulators in placental development and their molecular involvement in the pathogenesis of PE. The expression and localization of p21, phospho-p21 (Thr-145), p27, and p57 was immunohistochemically analyzed in placental tissues from patients with early-onset PE, early-onset PE complicated by the HELLP (hemolysis, elevated liver enzymes and low platelet count) syndrome as well as late-onset PE compared to their corresponding control tissues from well-matched women undergoing caesarean sections. The gene level was evaluated using real-time quantitative PCR. We demonstrate that the delivery mode strongly influenced placental gene expression, especially for CDKN1A (p21) and CDKN1B (p27), which were significantly upregulated in response to labor. Cell cycle regulators were highly expressed in first trimester placentas and impacted by hypoxic conditions. In support of these observations, p21 protein was abundant in trophoblast organoids and hypoxia reduced its gene expression. Microarray analysis of the trophoblastic BeWo cell line depleted of p21 revealed various interesting candidate genes and signaling pathways for the fusion process. The level of p21 was reduced in fusing cytotrophoblasts in early-onset PE placentas and depletion of p21 led to reduced expression of fusion-related genes such as syncytin-2 and human chorionic gonadotropin (β-hCG), which adversely affected the fusion capability of trophoblastic cells. These data highlight that cell cycle regulators are important for the development of the placenta. Interfering with p21 influences multiple pathways related to the pathogenesis of PE.
Although anti-cancer properties of the natural compound curcumin have been reported, low absorption and rapid metabolisation limit clinical use. The present study investigated whether irradiation with visible light may enhance the inhibitory effects of low-dosed curcumin on prostate cancer cell growth, proliferation, and metastasis in vitro. DU145 and PC3 cells were incubated with low-dosed curcumin (0.1–0.4 µg/mL) and subsequently irradiated with 1.65 J/cm2 visible light for 5 min. Controls remained untreated and/or non-irradiated. Cell growth, proliferation, apoptosis, adhesion, and chemotaxis were evaluated, as was cell cycle regulating protein expression (CDK, Cyclins), and integrins of the α- and β-family. Curcumin or light alone did not cause any significant effects on tumor growth, proliferation, or metastasis. However, curcumin combined with light irradiation significantly suppressed tumor growth, adhesion, and migration. Phosphorylation of CDK1 decreased and expression of the counter-receptors cyclin A and B was diminished. Integrin α and β subtypes were also reduced, compared to controls. Irradiation distinctly enhances the anti-tumor potential of curcumin in vitro and may hold promise in treating prostate cancer.
Sphingosine 1 phosphate (S1P) lyase (Sgpl1) catalyses the irreversible cleavage of S1P and thereby the last step of sphingolipid degradation. Loss of Sgpl1 in humans and mice leads to accumulation of sphingolipids and multiple organ injuries. Here, we addressed the role of hepatocyte Sgpl1 for regulation of sphingolipid homoeostasis by generating mice with hepatocyte-specific deletion of Sgpl1 (Sgpl1HepKO mice). Sgpl1HepKO mice had normal body weight, liver weight, liver structure and liver enzymes both at the age of 8 weeks and 8 months. S1P, sphingosine and ceramides, but not glucosylceramides or sphingomyelin, were elevated by ~1.5–2-fold in liver, and this phenotype did not progress with age. Several ceramides were elevated in plasma, while plasma S1P was normal. Interestingly, S1P and glucosylceramides, but not ceramides, were elevated in bile of Sgpl1HepKO mice. Furthermore, liver cholesterol was elevated, while LDL cholesterol decreased in 8-month-old mice. In agreement, the LDL receptor was upregulated, suggesting enhanced uptake of LDL cholesterol. Expression of peroxisome proliferator-activated receptor-γ, liver X receptor and fatty acid synthase was unaltered. These data show that mouse hepatocytes largely compensate the loss of Sgpl1 by secretion of accumulating sphingolipids in a specific manner into blood and bile, so that they can be excreted or degraded elsewhere.
Objective: Dravet syndrome (DS) is a rare but severe drug-resistant epilepsy. Before the approval of fenfluramine (FFA) for the treatment of seizures in DS, patients in Germany could receive treatment under a compassionate use program (CUP). Methods: We conducted a multicenter, retrospective, observational study to describe the efficacy, tolerability, and retention of FFA within the CUP. Patients received add-on therapy with oral FFA gradually titrated to a target dose between .13 and .7 mg/kg/day Results: Overall, 78 patients with DS (median age = 8.0 years, range = 2.1–46.0; 53% female, median concomitant antiseizure medications [ASMs] = 3) were treated with FFA for a median duration of 255.5 days (range = 31–572). Responder rates (a ≥50% reduction; n = 78) and seizure-freedom rates at 3 months were 68% and 14% for total seizures, respectively, and 67% and 23% for generalized tonic–clonic seizures. Responder rates were consistent at 6 and 12 months (n = 66 and n = 43, respectively). Median seizure days per month significantly decreased from 10.0 (range = .5–30) to 3.0 (range = 0–30) in the 3-month period before and after FFA treatment (p < .001). Significantly fewer patients reported at least one episode of status epilepticus (28% vs. 14% patients before and after FFA initiation, p = .005). During FFA treatment, 35 (45%) patients were able to discontinue a concomitant ASM. At the last follow-up date, 66 (85%) patients remained on treatment with FFA. The most common adverse events were somnolence (36%), decreased appetite (22%), and ataxia (8%). Forty-eight (62%) patients were reported as having a meaningful global clinical improvement. Significance: In a large cohort of patients, FFA demonstrated efficacy across a range of outcomes including clinically significant reductions in convulsive seizures, and was well tolerated, providing valuable information for real-world practice.
Background: To test the effect of urological primary cancers (bladder, kidney, testis, upper tract, penile, urethral) on overall mortality (OM) after secondary prostate cancer (PCa). Methods: Within the Surveillance, Epidemiology and End Results (SEER) database, patients with urological primary cancers and concomitant secondary PCa (diagnosed 2004-2016) were identified and were matched in 1:4 fashion with primary PCa controls. OM was compared between secondary and primary PCa patients and stratified according to primary urological cancer type, as well as to time interval between primary urological cancer versus secondary PCa diagnoses. Results: We identified 5,987 patients with primary urological and secondary PCa (bladder, n = 3,287; kidney, n = 2,127; testis, n = 391; upper tract, n = 125; penile, n = 47; urethral, n = 10) versus 531,732 primary PCa patients. Except for small proportions of Gleason grade group and age at diagnosis, PCa characteristics between secondary and primary PCa were comparable. Conversely, proportions of secondary PCa patients which received radical prostatectomy were smaller (29.0 vs. 33.5%), while no local treatment rates were higher (34.2 vs. 26.3%). After 1:4 matching, secondary PCa patients exhibited worse OM than primary PCa patients, except for primary testis cancer. Here, no OM differences were recorded. Finally, subgroup analyses showed that the survival disadvantage of secondary PCa patients decreased with longer time interval since primary cancer diagnosis. Conclusions: After detailed matching for PCa characteristics, secondary PCa patients exhibit worse survival, except for testis cancer patients. The survival disadvantage is attenuated, when secondary PCa diagnosis is made after longer time interval, since primary urological cancer diagnosis.
Im Bereich der Neonatologie kommen die Patient*innen oft multimorbide zu Welt oder sind für bestimmte Komplikationen gefährdet, die sich aus ihrer Unreife ergeben. Dabei spielen sowohl bei reifen kranken Neugeborenen und erst recht bei Frühgeborenen Erkrankungen der Atemwege eine Hauptrolle. Nach wie vor ist das konventionelle Röntgen in diesem Bereich der Medizin ein wichtiges Instrument. Die diagnostische Strahlenexposition bietet jedoch immer wieder Raum zur Diskussion. Die Patient*innen sind nur wenige Tage alt und besitzen somit über eine hohe Proliferationsrate und ein Maß an undifferenzierten Zellen, sie erhalten in Summe teilweise viele Aufnahmen und haben auf der anderen Seite eine hohe Lebenserwartung, wenn sie die Neugeborenenzeit ohne Komplikationen überleben. Haupteffekte ionisierender Strahlen sind für die Früh- und kranken Neugeborenen Malignome, vor allem die Leukämien. Es soll herausgefunden werden, inwieweit die Strahlenbelastung ein gesundheitliches Risiko für die Früh- und Neugeborenen darstellt.
Hintergrund: Gegenstand der wissenschaftlichen und klinischen Diskussion ist immer wieder das eventuell bestehende Risiko der einfallenden ionisierenden Röntgenstrahlung auf das Früh- oder Neugeborene, dennoch ist das Röntgen als diagnostisches Mittel notwendig. Es soll untersucht werden, wie hoch das gesundheitliche Risiko durch diagnostische Röntgenaufnahmen in der Praxis für die Früh- und Neugeborenen ist.
Material und Methoden: Alle Patient*innen des Schwerpunktes Neonatologie in der Klinik für Kinder- und Jugendmedizin aus dem Zeitraum vom 01.01.2013 bis 31.12.2018 im Universitätsklinikum Frankfurt wurden retrospektiv untersucht. Es wurden die Anzahl der Röntgenaufnahmen pro Patient*in, die zugrunde liegende Indikation, das Dosisflächenprodukt (DFP), die Effektive Dosis (ED) und das geschätzte Risiko dokumentiert, bzw. errechnet. Die ED ist eine Schätzgröße, welche mittels Konversionskoeffizienten aus den Eingangsgrößen des DFP, der Eintrittsdosis oder dem Air Kerma (Kai) berechnet wird. Im ICRP Bericht Nr. 60 finden sich Faktoren zur Risikoabschätzung von 2,8 bis 13*10-2 Sv-1. Diese Risikoeinschätzung nähert das durch Strahlung induzierte Risiko für Krebs in der ersten Lebensdekade an – vor allem für Leukämien, aber auch andere Krebsarten.
Ergebnisse: Von den insgesamt 3843 stationär in der Neonatologie behandelten Patient*innen (2013-2018) erhielten 1307 (34%) mindestens eine Röntgenaufnahme. Pro Jahr wurden in einer Abteilung für Neonatologie ca. 700 Röntgenaufnahmen angefertigt. Die mittlere Anzahl an Röntgenaufnahmen pro Patient*in betrug 3,19 Aufnahmen und korrelierte gegensinnig mit Geburtsgewicht und Gestationsalter. Am häufigsten wurden sehr kleine Frühgeborene untersucht, meistens in den ersten drei Lebenstagen. Im Laufe des Beobachtungszeitraums wurden weniger Röntgenaufnahmen angefertigt. Die häufigsten Gründe für Röntgenaufnahmen waren Kontrollen von Tubus oder ZVK-Lage. Je reifer und schwerer die Neugeborenen waren, desto seltener wurde ein pathologischer Befund erhoben. Bei niedrigem Geburtsgewicht war die Thoraxabdomenaufnahme die bevorzugte Röntgenart, bei reiferen Patient*innen die Thoraxaufnahme. Das kumulative DFP betrug im Mittel 5,95 mGy*cm² und die kumulative ED betrug im Mittel 23,7 µSv pro Aufenthalt. Damit errechnete sich ein Risiko von 3,1*10-6, das bedeutet 3,1 von 1.000.000 Patient*innen entwickeln nach dieser kumulativen Strahlendosis in der ersten Lebensdekade womöglich Krebs. Das kumulative DFP und die ED pro Aufenthalt und somit auch das Risiko, nach einer gewissen Strahlenexposition Krebs zu entwickeln, sinken mit zunehmendem Geburtsgewicht und zeigen einen Höhepunkt bei einem Geburtsgewicht von <500 g. Die maximale kumulative Strahlendosis betrug 342 µSv mit einem daraus resultierenden Risiko von 44*10-6 und ist damit selbst bei diesem Patienten nach Martin et al. als „minimal“ zu werten.
Schlussfolgerung: Die Strahlenbelastung der Früh- und Neugeborenen konnte evaluiert werden und der Zusammenhang zwischen Unreife und Strahlenbelastung konnte bestätigt werden. Die Strahlenbelastung fiel im internationalen Vergleich minimal aus und es ist nicht von einem gesundheitlichen Risiko durch diagnostische Bildgebung auszugehen. Dies lässt sich vor allem durch moderne Technik mit kurzer Belichtungszeit und hoher Aufnahmespannungen und durch die relativ niedrige Anzahl an gemachten Röntgenbildern erklären. Da bei weiterer Minimierung der eingesetzten Dosis von einem Qualitätsverlust der Bilder auszugehen ist, ist die Einsparung von Röntgenuntersuchungen und die vermehrte Nutzung von Alternativen anzuraten. Die Indikationen müssen vor allem bei Patient*innen <500 g genauestens überprüft werden. Weiterhin sollte nach Alternativen (Sonographie, Kernspintomographie) gesucht werden.
Increased intraindividual variability of reaction time is a main cognitive feature of Attention Deficit Hyperactivity Disorder. It is associated with deficits in sustained attention. While traditionally, mean and variance were used to characterize reaction time distributions, the ex-gaussian distributional model allows a more sophisticated analysis of reaction time series. Reaction time distributions are separated in a normal and an exponential component.
The present study investigates the impact of incentives on reaction time variability in a sample of adult ADHD patients. ADHD is associated with increased Tau, the output parameter of the ex-gaussian model characterizing the exponential part of the distribution. Tau is linked to “lapses of attention”, which are more frequent in ADHD patients. It is known that tau can be modulated in ADHD Patients. It was therefore postulated that tau would be higher in ADHD Patients in a paradigm where quick answers were required but could be modulated by monetary incentives. In addition, the effect of “delay discounting”, which is more distinct in ADHD patients, on reaction time variability was investigated. Eventually, the association of variability measures with strength of ADHD symptoms was tested.
To this end, reaction time distributions of 62 adult ADHD patients and 45 healthy controls from two different reaction time paradigms were analyzed. The monetary incentive delay task, by comprehending a control – and a win condition, allows an investigation of the effect of incentives on reaction times. Subjects had to react as fast as possible by keypress to a stimulus, after a cue signaled a possible monetary reward. During the Delay-Discounting-Task, subjects had to choose between sooner, but smaller, and higher delayed monetary rewards, during which they could use as much time for consideration as desired.
Results show that an increased Tau in the control condition of the monetary- incentive-delay-task could be replicated, while a distinct influence of the win condition emerged. Subjects with ADHD showed an improvement of Tau in the win condition even below the level of healthy controls. However, they showed increased variability of the “regular” responses around the mean of the normal component of the distribution, represented by sigma. Moreover, it was indicated by trend a higher reaction time variability in ADHD patients during choices of delayed rewards. Tau was associated the current symptom strength as well as with the strength of ADHD-Symptoms during childhood, assessed by questionnaire.
While the present results could have implications for etiological models of the disease, they may also contribute to the development of novel diagnostic methods. In advanced studies, neural correlates of sophisticated measures of reaction time variability should be investigated. Furthermore, they should be associated with genetic risk factors with regard to possible endophenotypes. Possible implications for clinical handling of patients should be explored.
Hintergrund: Die Verankerung der Kompetenzorientierung und die Betonung der praktisch-klinischen Ausbildung im Rahmen des Medizinstudiums sind zentrale Punkte in den Neuerungen der Ärztlichen Approbationsordnung. Mit der Entwicklung des Nationalen Kompetenzbasierten Lernzielkatalogs Medizin (NKLM) ist ein Rahmenwerk erstellt und verabschiedet worden, das die Inhalte des gesamten Medizinstudiums in Deutschland abbilden und eine Implementierung kompetenzorientierter Lernziele an den Fakultäten forcieren soll. Um diesem Ziel gerecht zu werden, müssen bereits an den Fakultäten vorhandene Lehrveranstaltungen mit dem NKLM abgeglichen und im Rahmen eines Curriculum Mappings kartiert werden. Ziel der vorliegenden Arbeit ist daher die Kartierung der im Frankfurter Blockpraktikum Chirurgie erlernten Kompetenzen im Sinne eines Curriculum Mappings in Anlehnung an die im NKLM formulierten Lernziele. Zudem wurde folgenden Fragestellungen nachgegangen: Welcher Umfang kompetenzorientierter Lernziele kann Studierenden in einem zweiwöchigen Praktikum Chirurgie vermittelt werden? Wie ist die Vermittlung der einzelnen Kapitel des NKLM im Blockpraktikum Chirurgie gewichtet? Gibt es Unterschiede der erreichten Lernziele in Abhängigkeit des Geschlechts der Studierenden, der besuchten Fachrichtung bzw. des besuchten Lehrkrankenhauses?
Material und Methoden: Im Rahmen der vorliegenden Arbeit wurden Medizinstudierende im zweiten bzw. dritten klinischen Semester unmittelbar nach Abschluss ihres Blockpraktikums Chirurgie gebeten, unter Nutzung eines Online-Fragebogens anzugeben, welche der im NKLM formulierten Lernziele sie im zweiwöchigen Blockpraktikum Chirurgie gelernt haben. Somit konnte für jedes Kapitel dargestellt werden, zu welchem prozentualen Anteil die Lernziele dieses Kapitels erreicht worden sind. Zudem wurden die soziodemographischen Daten der Studierenden, die Fachrichtung des Blockpraktikums und das Lehrkrankenhaus erfasst. Die statistische Auswertung erfolgte mit dem Wilcoxon-Mann-Whitney Test und dem Kruskal-Wallis Test.
Ergebnisse: Insgesamt nahmen 81 Studierenden (28 Männer, 53 Frauen) aus dem 2. bzw 3. klinischen Semester an der Studie teil. Insgesamt wurden im zweiwöchigen Blockpraktikum Chirurgie 8,78 ± 5,10% (Min. 1,01%; Max. 29,84%) aller Lernziele von den Studierenden erreicht. Hierbei wurden anteilig die meisten Lernziele in den Kapiteln 5-11 (Abschnitt 1 „Ärztliche Rollen“) mit 29,92 ± 15,22% (Min. 0,00%; Max. 63,10%) vermittelt. Aus Abschnitt 2 („Medizinisches Wissen, klinische Fähigkeiten und professionelle Haltungen“) wurden vor allem die Lernziele der Kapitel 14b „Klinisch-praktische Fertigkeiten“ (15,49 ± 7,78% (Min. 0,00%; Max. 41,30%) und 14c „Ärztliche Gesprächsführung“ (22,98 ± 16,47% (Min. 0,00%; Max. 70,69%) von den Studierenden erreicht. Männer geben durchschnittlich an, mehr Lernziele erreicht zu haben als Frauen (9,84% vs. 8,22%; p=0.104731). Weiterhin haben Studierende, die ihr Praktikum in einem Lehrkrankenhaus mit weniger als 100 chirurgischen Bettenplätzen (10,60 ± 6,75%; Min. 2,33%; Max. 29,84%) oder in einer Rotation (9,95 ± 6,67%; Min. 1,90%; Max. 29,84%) durch mehrere Fachrichtungen absolvierten, angegeben mehr Lernziele erreicht zu haben als andere Studierende insgesamt.
Schlussfolgerung: Das zweiwöchige Blockpraktikum Chirurgie in Frankfurt kann den Studierenden (im Hinblick auf die Gesamtdauer des Medizinstudiums) einen großen Anteil der im NKLM formulierten Lernziele vermitteln. Vor allem die Lernziele der „Ärztlichen Rollen“ und der „klinisch-praktischen Fertigkeiten“ werden erlernt. Die Vermittlung gelingt besonders umfangreich in kleineren Lehrkrankenhäusern. Trotzdem bietet das Blockpraktikum Chirurgie den Teilnehmer nur einen kleinen Einblick in den Fachbereich Chirurgie. Für die Vermittlung von spezifischen chirurgischen Fähigkeiten, Prinzipen chirurgischer Diagnostik und Therapie, sowie Aspekte der „Patientenzentrierten Gesundheitsversorgung“ sind andere Formate notwendig.
Locomotor activity patterns of laboratory mice are widely used to analyze circadian mechanisms, but most investigations have been performed under standardized laboratory conditions. Outdoors, animals are exposed to daily changes in photoperiod and other abiotic cues that might influence their circadian system. To investigate how the locomotor activity patterns under outdoor conditions compare to controlled laboratory conditions, we placed 2 laboratory mouse strains (melatonin-deficient C57Bl and melatonin-proficient C3H) in the garden of the Dr. Senckenbergische Anatomie in Frankfurt am Main. The mice were kept singly in cages equipped with an infrared locomotion detector, a hiding box, nesting material, and with food and water ad libitum. The locomotor activity of each mouse was recorded for 1 year, together with data on ambient
temperature, light, and humidity. Chronotype, chronotype stability, total daily activity, duration of the activity period, and daily diurnality indices were determined from the actograms. C3H mice showed clear seasonal differences in the chronotype, its stability, the total daily activity, and the duration of the activity period. These pronounced seasonal differences were not observed in the C57Bl. In both strains, the onset of the main activity period was mainly determinedby the evening dusk, whereas the offset was influenced by the ambient temperature. The actograms did not reveal infra-, ultradian, or lunar rhythms or a weekday/weekend pattern. Under outdoor conditions, the 2 strains retained their nocturnal locomotor identity as observed in the laboratory. Our results indicate that the chronotype displays a seasonal plasticity that may depend on the melatoninergic system. Photoperiod and ambient temperature are the most potent abiotic entraining cues. The timing of the evening dusk mainly affects the onset of the activity period; the ambient temperature during this period influences the latter’s duration. Humidity, overall light intensities, and human activities do not affect the locomotor behavior.
Durch die sich verändernde Altersstruktur nehmen die Inzidenz und Prävalenz von Herzklappenerkrankungen wie der Mitralinsuffizienz weltweit zu, verbunden mit einem Verlust an Lebensqualität und Lebensjahren für den individuellen Patienten und hohen Kosten für das Gesundheitssystem. Die Standardtherapie, eine chirurgische Rekonstruktion oder ein Ersatz der Mitralklappe kommt aufgrund von Alter und Begleiterkrankungen (insbesondere der Herzinsuffizienz) bei bis zu 50% der Patienten nicht in Frage. Die MitraClip- Prozedur ist ein etabliertes Verfahren zur minimalinvasiven Therapie der hochgradigen Mitralklappeninsuffizienz bei Patienten mit hohem Operationsrisiko. In einigen, jedoch nicht allen Patientenkohorten konnte ein positiver Einfluss auf Rehospitalisierungen und Sterblichkeit gezeigt werden. Insbesondere Patienten mit Rechtsherzdysfunktion (RVD) scheinen weniger zu profitieren. Aufgrund des individuellen Risikos des Eingriffs und der erheblichen Kosten ist es notwendig, Patienten zu identifizieren die von dem Eingriff profitieren und solche bei denen ein ungünstiges Nutzen/ Risikoverhältnis besteht.
Im Rahmen des Frankfurter Mitralklappenregisters wurden 119 Patienten im interdisziplinären Konsens („Heart Team“) vom 07/2013 bis 02/2017 mit der MitraClip Prozedur behandelt und nach ihrem schriftlichen Einverständnis in die Analyse eingeschlossen. Der Langzeitverlauf wurde bis zum 31.12.2017 beobachtet.
Ziel der Studie war, zu erfassen, ob die Anwendung von bei Herzinsuffizienz etablierten Prognosemodellen bei diesen Patienten sinnvoll ist und ob sich das Seattle Heart Failure Model (SHFM) und der Meta-Analysis Global Group in Chronic Heart Failure (MAGGIC) Score in ihrer Genauigkeit bei diesen Patienten unterscheiden insbesondere im Kontext einer RVD.
Die Diagnose einer RVD erfolgte über den im Herzultraschall leicht zu erfassenden Parameter „Tricuspid Annular Plane Excursion“ (TAPSE), der die während der Systole zurückgelegte Strecke des Trikuspidalrings misst.
Die Genauigkeit in der Vorhersage der 1- Jahres Mortalität der beiden Scores wurde durch die Bestimmung der Area under the Receiver Operating Characteristic (AUROC) ermittelt.
Innerhalb eines Jahres nach MitraClip- Therapie verstarben 29 Patienten (28.2%) des Gesamtkollektivs. Bei Patienten mit funktioneller Mitralklappeninsuffizienz (FMR) betrug die 1- Jahres Mortalität 23,3%, bei Patienten mit degenerativer Mitralklappeninsuffizienz (DMR) 31,7%. In der Kaplan- Meier Analyse bestand eine signifikant erhöhte 1- Jahres Mortalität für Patienten mit RVD (34.8 vs 22.8%; p=0.009). Patienten mit FMR wiesen eine erhöhte Sterblichkeit auf, wenn gleichzeitig eine RVD bestand (38.1% vs 9.1% ohne RVD). Diese Assoziation bestand bei Patienten mit DMR nicht (32% mit RVD vs. 34.3%).
Die prognostische Genauigkeit beider Scores war im Gesamtkollektiv vergleichbar (SHFM: 0.704, MAGGIC: 0.692). Das gilt auch für separate Analysen nach funktioneller/ degenerativer Genese der Mitralklappeninsuffizienz (FMR: SHFM 0.696, MAGGIC 0.722; DMR: SHFM 0.727, MAGGIC 0.629). Bei Patienten ohne RVD zeigt das SHFM jedoch eine höhere diagnostische Genauigkeit als der MAGGIC Score (SHFM: 0.775; MAGGIC: 0.551, p <0.05). Bei Patienten mit Rechtsherzdysfunktion bestehen keine signifikanten Unterschiede (SHFM: 0.615; MAGGIC: 0.799, p>0.05), auch wenn ein Trend zugunsten des MAGGIC Scores bestand.
Eine bestehende RVD ist ein wichtiger prognostischer Marker für Patienten, die mit einem Mitraclip behandelt werden und sollte in der Entscheidungsfindung des „Heart Teams“ berücksichtigt werden. SHFM und MAGGIC Score besitzen eine adäquate prognostische Trennschärfe in unserer Patientenkohorte, Unterschiede bestehen bei Patienten mit/ ohne RVD. Aufgrund der Heterogenität der Erkrankung sowie der Begleiterkrankungen besteht für beide Scores nur eine moderate Trennschärfe, sie dürfen beim individuellen Patienten nicht einziges Entscheidungskriterium sein. Denkbar wäre, durch einen „machine learning“ Ansatz unter Einbeziehung klinischer, anatomischer, demographischer und laborchemischer Daten ein Score System zu entwerfen, mit dem eine höhere prognostische Genauigkeit erreicht werden könnte.
The capacity of convalescent and vaccine-elicited sera and monoclonal antibodies (mAb) to neutralize SARS-CoV-2 variants is currently of high relevance to assess the protection against infections. We performed a cell culture-based neutralization assay focusing on authentic SARS-CoV-2 variants B.1.617.1 (Kappa), B.1.617.2 (Delta), B.1.427/B.1.429 (Epsilon), all harboring the spike substitution L452R. We found that authentic SARS-CoV-2 variants harboring L452R had reduced susceptibility to convalescent and vaccine-elicited sera and mAbs. Compared to B.1, Kappa and Delta showed a reduced neutralization by convalescent sera by a factor of 8.00 and 5.33, respectively, which constitutes a 2-fold greater reduction when compared to Epsilon. BNT2b2 and mRNA1273 vaccine-elicited sera were less effective against Kappa, Delta, and Epsilon compared to B.1. No difference was observed between Kappa and Delta towards vaccine-elicited sera, whereas convalescent sera were 1.51-fold less effective against Delta, respectively. Both B.1.617 variants Kappa (+E484Q) and Delta (+T478K) were less susceptible to either casirivimab or imdevimab. In conclusion, in contrast to the parallel circulating Kappa variant, the neutralization efficiency of convalescent and vaccine-elicited sera against Delta was moderately reduced. Delta was resistant to imdevimab, which, however, might be circumvented by combination therapy with casirivimab together.
Im EU-Projekt „Regulatory Control Networks of Synthetic Lethality“ (SYNLET) wurden durch Vergleich der Genexpressionsprofile auf Transkriptionsebene von parentalen sensitiven Neuroblastom-Zelllinien und ihren Vincristin-resistenten Sublinien bioinformatisch 40 Kandidatengene ermittelt, die für Vincristin-Resistenz und damit Zellüberleben essentiell sein könnten. Diese Kandidatengene wurden im Rahmen dieser Dissertation einzeln in Neuroblastomzellen der Vincristin-resistenten Sublinie UKF-NB-2rVCR20 herunterreguliert durch Transfektion (Elektroporation) von small interfering RNAs (siRNAs; knock down). Anschließend wurden die Zellen ohne und mit verschiedenen Vincristin-Konzentrationen auf Zellviabilitätsveränderungen getestet. Beim Kandidatengen mit den niedrigsten Zellviabilitäten (SMARCC1) wurde ein Western Blot gemacht, um die Herunterregulierung zu bestätigen. Zu Beginn wurde das effektivste Programm zur Elektroporation der UKF-NB-2rVCR20-Zellen durch eine Transfektionsoptimierung ermittelt. Alle Kandidatengene wurden 2x transfiziert, bei unklaren oder besonders interessanten Ergebnissen auch 3x. Als positive Kontrolle wurde der ABC-Transporter MDR1 herunterreguliert, da hier die Auswirkungen auf die Resistenz gegen Vincristin bekannt sind. Bei 10 von 40 Kandidatengenen waren die Zellviabilitäten ohne Vincristin und/oder bei mindestens einer Vincristin-Konzentration extrem verändert (FOXJ1, MAP2K1, NFYB, RICS, SMARCA1, SMARCB1, SMARCC1, STK35, TOCA1 und TPM2). Das entspricht einem Prozentsatz von 25 % Kandidatengenen, bei denen die bioinformatisch vorhergesagte Wirkung in vitro bestätigt werden konnte. Allerdings sind bei diesen 10 effektiven Kandidatengenen auch 2 Gene dabei, nach deren Herunterregulierung es zu einer erhöhten Zellviabilität kam (FOXJ1 und RICS). Bei der Frage, welche Gene das Absterben der Tumorzellen beschleunigen und als ein mögliches Therapieziel in Frage kommen könnten, bleiben also 8 Kandidatengene (20 % aller Kandidatengene). Das interessanteste Kandidatengen ist SMARCC1, da die Herunterregulierung alleine (ohne Zugabe von Vincristin) zu einer massiven Abnahme der Zellviabilität führte. Damit stellt SMARCC1 ein interessantes Ziel zur Therapie in Tumorzellen dar.
Traumatische Verletzungen fordern jährlich über fünf Millionen Todesopfer. Sie sind bei unter 45-Jährigen die häufigste Ursache für Tod und körperliche Behinderung dar. Ein Polytrauma verursacht eine schwere Belastung für das Immunsystem und ist häufig von schweren Störungen der Immunregulation gekennzeichnet. Die Immunreaktion übersteigt bei schweren Traumata das für lokale Reparaturmechanismen notwendige Maß, und so kommt es je nach Ausmaß der Verletzungen innerhalb der ersten Minuten bis Stunden zu einer systemischen Hyperinflammation, dem sogenannten Systemischen Inflammatorischen Response- Syndrom (SIRS). Auch in nicht verletzten Organen verursacht SIRS Störungen in der Endothel-Funktion, wodurch die Mikrozirkulation in diesen Organgen beeinträchtigt ist. In der Folge kommt es zu interstitieller Ödembildung, zur Gewebsinfiltration durch Leukozyten und zu Zelluntergang. Diese Prozesse können zur Fehlfunktion von Organen bis hin zum Organversagen, und, da sie häufig in mehreren Organen gleichzeitig ablaufen, auch zum klinisch dann oft schwer beherrschbaren Multiorganversagen (MOV) führen. Auf der anderen Seite stoßen schwere Verletzungen antiinflammatorische Prozesse an, die zu einer ausgeprägten Immunsuppression führen können, dem Kompensatorischen Antiinflammatorischen Response-Syndrom (CARS), mit der Folge, dass polytraumatisierte Patienten erhöht anfällig für infektiöse Komplikationen sind. Die beschriebenen Funktionsstörungen des Immunsystems sind ein wichtiger Mortalitätsfaktor von polytraumatisierten Patienten. Während wir SIRS und seine Folgen über die letzten Jahre immer besser verstehen, mit signifikanten Fortschritten auch für die klinische Handhabung dieser Komplikationen des Polytraumas, ist CARS weit schlechter untersucht.
Während der post-traumatschen Immunantwort spielen nicht nur Zellen der angeborenen, sondern auch solche der erworbenen Immunabwehr eine wichtige Rolle. So sind regulatorische T-Zellen (Treg) entscheidend an der posttraumatischen Immunsuppression beteiligt. Treg beeinflussen die immunologische Homöostase Treg mit einem Arsenal immunsuppressiver Werkzeuge. Sie töten oder beeinflussen beispielsweise antigenpräsentierende Zellen oder T-Effektorzellen und verändern das Zytokinmilieu und metabolische Signalwege. Nach einem Trauma kann eine überschießende Aktivität von Treg die immunologische Balance so beeinträchtigen, dass eine posttraumatische Immunsuppression entsteht oder intensiviert wird. Die hier vorgestellte Studie Ziel dient daher dem besseren Verständnis der Dynamik von Treg nach einer stattgehabten traumatischen Verletzung. Dafür untersuchten wir die Verläufe verschiedener Subpopulationen von Treg im Blut schwer verletzter Patienten. Da der Forschung am Menschen in vivo enge ethische und methodologische Grenzen gesetzt sind, nehmen Tiermodelle in der Traumaforschung einen hohen Stellenwert ein. Daher verglichen wir die an Patienten erhobenen Daten über die posttraumatische Dynamik von Treg mit den Verläufen in einem adäquaten Tiermodell.
Aufgrund der guten anatomischen, physiologischen und genetischen Ähnlichkeit zum Menschen werden Tiermodelle am Schwein zunehmend beliebter. Ein Polytraumamodell am Schwein existiert erst seit wenigen Jahren. Über Treg wurde in diesem Rahmen bisher nicht geforscht. Die Charakterisierung ihres Immunphänotyps und ihrer Dynamik könnte die Anwendbarkeit des Schweine-Modells für Fragen der Trauma-Forschung verbessern und gleichzeitig unser Verständnis der Pathophysiologie posttraumatischer Komplikationen wir SIRS oder Sepsis erhöhen.
Bei 20 Traumapatienten (TP) mit einem Injury Severity Score (ISS) ≥ 16 wurde bei Ankunft in der Notaufnahme, nach einem und nach drei Tagen venöses Blut entnommen. Zehn gesunde Freiwillige (HV) fungierten in der Studie als Kontrollgruppe. Das Polytrauma im Großtiermodell am Schwein bestand aus einer Femurfraktur, einer Leberlazeration, einer Lungenkontusion und einem hämorrhagischen Schock, was einen ISS von 27 ergab. Auf die Traumainduktion folgte die Reanimationsphase und die chirurgische Versorgung der Femurfraktur nach dem damage-control-Prinzip. Die Blutentnahmen erfolgten bei den Versuchstieren vor und sofort nach Trauma, sowie nach 24 und 72 Stunden. Wir verglichen die Dynamik der Verläufe der Treg von TP mit denen von HV und mit Daten aus den Tierversuchen. Es herrscht noch kein wissenschaftlicher Konsens darüber, welche Kombination aus immunologischen Oberflächenmarkern die Identifikation von Treg zuverlässig gewährleisten kann. Dies liegt auch daran, dass Treg eine Gruppe verschiedener Unterpopulationen darstellen. Folglich analysierten wir verschiedene Kombinationen. Wir färbten Cluster of differentiation (CD) 4-positive und CD25-positive (CD4+CD25+), CD4+CD25+forkhead box P3 (FoxP3)+, CD4+CD25+CD127-negative (CD127−) und CD4+CD25+CD127−FoxP3+ Zellen mit Antikörpern und charakterisierten die jeweilige Gruppe mithilfe der Durchflusszytometrie. CD4+CD25+CD127− Treg sind beim Menschen bekannt. Beim Schwein werden sie in dieser Studie erstmalig beschrieben.
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Die NOD.α4-/- Maus ist eine auf hämatopoetische Zellen beschränkt α4-inkompetente Maus auf dem NOD Hintergrund. Die Maus ist vollständig gegen Diabetes gefeit, entwickelt keine Insulitis und keine Sialitis. Analysen der α- und ß-Diversität des Mikrobioms zeigen eine vergleichbare Zusammensetzung in NOD.α4-/- und NOD Kontrollmaus, während erkrankte Mäuse ein auffällig eingeschränktes Mikrobiom und atypische Spezies aufweisen. Inselzellantigen-spezifische CD8+ T-Zellen und anti-Insulin-Autoantikörper sind quantitativ stark vermindert im Vergleich zu NOD Kontrollen, jedoch sicher nachweisbar. Das 5-Linien-Differenzialblutbild ist absolut und relativ unauffällig. Die NOD.α4-/- Maus entwickelt nach adoptivem Transfer von CD3+ Zellen diabetischer NOD-Spender mit kurzer Latenz und 100%iger Penetranz Diabetes, ein isolierter Transfer diabetogener CD4+ Zellen ist hierzu nicht hinreichend. α4-kompetente CD8+ Zellen sind also unerlässlich für den adoptiven Transfer von Diabetes in die NOD.α4-/- Maus. Rekonstitution prädiabetischer wildtypischer NOD Empfänger mit NOD.α4-/- Hämatopoese schützt diese zuverlässig vor dem Progress der Insulitis zum Diabetes. Diese Arbeit unterstreicht und sichert die bisherigen α4-Antikörper Studien in der NOD Maus und korrigiert die Annahme, α4-Blockade schütze nicht vor dem Voranschreiten der Sialitis. NOD.a4-/- Lymphozyten werden regelrecht gegen Autoantigene sensibilisiert, in Ermangelung effektiver Infiltration der Zielorgane bleibt jedoch die Expansion antigenspezifischer T-zellen und das Boosten von humoralen Autoimmunantworten aus. α4-inkompetente Leukozyten migrieren auch nach Beginn einer Insulitis oder damit einhergehender Hochregulierung verschiedenster endothelialer Oberflächenproteine nicht in die entzündeten Langerhans-Inseln. Die sichere Prävention der Erkrankung durch Rekonstitution mit α4-/- Hämatopoese identifiziert die α4-Blockade als mögliche Therapie des Typ 1 Diabetes während der Phase des Prädiabetes.
Differentialdiagnostik der frühen primären Myelofibrose (präPMF) gemäß der neuen WHO-Klassifikation
(2020)
Die vorliegende Arbeit stützt sich auf die retrospektive Begutachtung von 348 Knochenmarkbiopsien, welche anhand der WHO-Klassifikation von 2016 erneut reevaluiert wurden. Insbesondere widmeten wir uns der Differentialdiagnostik der „echten ET“ und der thrombozythämisch verlaufenden Form der PMF (präPMF). Die Einteilung erfolgte anhand morphologischer Kriterien, wie sie in der WHO-Klassifikation von 2016 aufgeführt sind.
Zusammengefasst ist eine richtungsweisende diagnostische Entscheidung der Patienten mit ET und präPMF nur möglich, wenn man sowohl die molekulargenetischen und klinischen Parameter in Kombination mit histologischen Kriterien und deren charakteristischen Mustern betrachtet. Eine repräsentative Knochenmarkbiopsie und deren standardisierte Befundung ist daher von absoluter diagnostischer Wichtigkeit für die Subtypisierung der MPN. Augenmerk sollte auf das typisch dargebotene morphologische Muster gelegt werden und nicht auf einzelne Merkmale. Die vorliegende Knochenmarkbiopsie muss nicht, wie früher praktiziert, anhand vieler einzelner Merkmale detailliert betrachtet und bewertet werden. Durch eine kombinierte Betrachtung von nur wenigen morphologischen Schlüsselparametern ist bereits eine Diagnose mit hoher Reproduzierbarkeit möglich. Mit dieser Arbeit wird der Stellenwert der WHO-Klassifikation unterstrichten, da die hier vorgegebenen Kriterien absolut essentiell und trotzdem in ihrem Umfang ausreichend sind, um die Differentialdiagnostik der MPN in Zukunft zu verbessern.
In der vorliegenden Studie sollte der Einfluss eines systematischen Krafttrainings auf die ergonomische Arbeitsweise und die ergonomische Risikobeurteilung von Zahnärzten und Zahnmedizinischen Fachangestellten anhand objektiver Daten untersucht werden. Dafür wurden 22 Probanden rekrutiert. An der Studie nahmen 13 ZÄ, 7 ZFAs und 2 Studenten der Zahnmedizin teil. Als Einschlusskriterium wurden Beschwerden im Rücken- und/oder Nacken- und/oder Schulterbereich innerhalb der letzten zwölf Monaten definiert. In den Einrichtungen des Instituts für Arbeitsmedizin, Sozialmedizin und Umweltmedizin des Universitätsklinikums Frankfurt am Main (Deutschland) fanden biomechanische Prä- und Postmessungen der ergonomischen Arbeitsweise statt. Die Messungen erfolgten mit dem inertialen Messsystem MVN BIOMECH Link der Firma XSens (Enschede, Niederlande). Die Probanden arbeiteten während der Messung an einer ihnen vertrauten Behandlungseinheit und behandelten am Phantomkopf in einer ihrer Fachrichtung entsprechenden Behandlungssimulation bestehend aus praxisnahen zahnmedizinischen Aufgaben. Zwischen der Prä- und Postmessung absolvierten die Probanden eine 10- bis 12-wöchige, systematische Krafttrainingsintervention mit zwei einstündigen Trainingseinheiten pro Woche. Für das Training wurden Übungen zur Kräftigung der stabilisierenden Haltemuskulatur ausgewählt, insbesondere im Rücken, Nacken, Schultern und Rumpf, entsprechend den vorherrschenden Regionen muskuloskelettaler Beschwerden unter ZÄ und ZFAs. Das Training wurde in Kleingruppen von den Untersuchern betreut.
Die erhobenen kinematischen Daten der biomechanischen Messungen wurden im Programm Matlab (MATrix LABoratory) auf Grundlage der gemessenen Gelenkwinkel und -positionen sowie des angepassten RULA Arbeitsbogens ausgewertet. Die statistische Auswertung erfolgte mit den Programmen BiAS Version 11.12 (Epsilon Verlag, Darmstadt, Deutschland, 2020) und IBM SPSS Statistics Version 26 (IBM, New York, USA, 2019). Die erhobenen RULA Parameter wurden mit dem Wilcoxon-Matched-Pairs Test statistisch ausgewertet. Die erhobenen Gelenkwinkel wurden mithilfe des Systematic Parametric Mapping statistisch überprüft. Das Signifikanzniveau lag bei 5%.
Die vorliegende Studie konnte anhand objektiver Daten die Ergebnisse vorheriger Autoren bestätigen, dass ZÄ und ZFAs oftmals mit vorgebeugtem Nacken und Oberkörper arbeiten, während diese z.T. zusätzlich noch rotiert und/oder seitlich gebeugt sind.
Besonders der Nacken weicht bei der Arbeit stark von einer neutralen Haltung ab. Mit den oberen Extremitäten arbeiten die Behandler oftmals asymmetrisch. Der rechte Oberarm ist stärker angehoben und abduziert als der linke und weicht stärker von einer neutralen Haltung ab. Mit den Unterarmen arbeiten ZÄ und ZFAs oftmals exzentrisch über die Körpermitte hinaus bzw. außerhalb ihrer Körpermitte. Die Handgelenke sind zumeist stark angewinkelt und zeigen eine deutliche Radialdeviation. Die ergonomische Arbeitsweise von zahnmedizinischem Personal konnte anhand dieser Studie als gesundheitlich hoch risikobehaftet eingestuft werden. Besonders die Nackenregion, die Unterarme sowie die beiden Handgelenke konnten anhand der objektiven Daten als Risikobereiche ausgemacht werden. Der Einfluss des systematischen Krafttrainings wurde im Prä-Post-Vergleich anhand der kinematischen Daten überprüft. Die gemessenen Gelenkwinkel und -positionen zeigten sich nach der Trainingsintervention größtenteils unverändert oder zeigten keine Verbesserung hin zu neutralen Gelenkwinkeln. Dies suggeriert, dass ein 10-12 wöchiges systematisches Krafttraining nicht oder nur begrenzt zu einer aufrechteren, entspannten und symmetrischeren Arbeitshaltung führt wie sie für die zahnmedizinischen Berufe gefordert wird. Der Einfluss des systematischen Krafttrainings wurde ebenfalls bezüglich der ergonomische Risikobeurteilung durch RULA im Prä-Post-Vergleich überprüft. Für die Gesamtbewertung der Arbeitsweise konnte statistisch keine signifikante (p≥ 0,05) Veränderung und deskriptiv keine Verbesserung nachgewiesen werden. Auch im Vergleich der ergonomischen Risikobeurteilung der einzelnen Körperregionen zeigte nur der Nacken eine statistisch signifikante Veränderung (p ≤ 0,05). Für ihn konnte bestätigt werden, dass ein systematisches Krafttraining zu einer wenn auch geringen verbesserten objektiven Bewertung der ergonomischen Arbeitsweise und weniger Arbeitszeit in gesundheitlich riskanten ergonomischen Arbeitsweisen führt.
Mit dieser Studie konnte anhand objektiver Daten das hohe gesundheitliche Risiko zahnmedizinischer Berufe und ihrer ergonomischen Arbeitsweise bestätigt werden. Ein systematisches 10- bis 12-wöchiges Krafttraining zeigte zumeist keinen Einfluss bzw. keine Verbesserung bezüglich der ergonomischen Arbeitsweise. Die Studienergebnisse stellen in Frage, in wie fern sich die Arbeitshaltung in zahnärztlichen Berufen durch verhaltenspräventive Maßnahmen wie körperliches Training beeinflussen lassen.
The scope of extracorporeal membrane oxygenation (ECMO) is expanding, nevertheless, pharmacokinetics in patients receiving cardiorespiratory support are fairly unknown leading to unpredictable drug concentrations. Currently, there are no clear guidelines for antibiotic dosing during ECMO. This study aims to evaluate the pharmacokinetics (PK) of cefazolin in patients undergoing ECMO treatment. Total and unbound plasma cefazolin concentration of critically ill patients on veno-arterial ECMO were determined. Observed PK was compared to dose recommendations calculated by an online available, free dosing software. Concentration of cefazolin varied broadly despite same dosage in all patients. The mean total and unbound plasma concentration were high showing significantly (p = 5.8913 E−09) greater unbound fraction compared to a standard patient. Cefazolin clearance was significantly (p = 0.009) higher in patients with preserved renal function compared with CRRT. Based upon the calculated clearance, the use of dosing software would have led to lower but still sufficient concentrations of cefazolin in general. Our study shows that a “one size fits all” dosing regimen leads to excessive unbound cefazolin concentration in these patients. They exhibit high PK variability and decreased cefazolin clearance on ECMO appears to compensate for ECMO- and critical illness-related increases in volume of distribution.
Zielsetzung: Das Ziel dieser Arbeit war die Beurteilung der diagnostischen Leistungsfähigkeit der virtuellen Noncalcium (VNCa) Dual-Energy-Computertomographie (DECT) für den Nachweis lumbaler Bandscheibenvorfälle im Vergleich zu der konventionellen Graustufen-Computertomographie. Dabei galt die Magnetresonanztomographie (MRT) als Referenzstandard.
Material und Methodik: Für diese retrospektive Studie wurden 41 Patienten (243 Bandscheiben; Durchschnittsalter 68 Jahre; 24 Frauen [Durchschnittsal-ter, 68 Jahre] und 17 Männer [Durchschnittsalter, 68 Jahre]) zwischen März 2017 und Januar 2018 einer klinisch indizierten DECT, durchgeführt mit einem Dual-Source-Computertomographie (DSCT)-Scanner der dritten Generation (Somatom Force; Siemens Healthineers, Forchheim, Deutschland) sowie einer 3.0-Tesla MRT (Magnetom PrismaFit; Siemens Healthineers, Forchheim, Deutschland) im Abstand von maximal zwei Wochen unterzogen. Sechs Radiologen, verblindet hinsichtlich der klinischen und MRT-Informationen, untersuchten unabhängig voneinander die konventionellen Graustufen-DECT-Bildserien auf das Vorhandensein und den Grad eines Bandscheibenvorfalls sowie der Affektion der Spinalnervenwurzeln. Nach acht Wochen wurden die Bildserien von den gleichen sechs Untersuchern unter Verwendung von farbkodierten VNCa-Rekonstruktionen neu ausgewertet. Die MRT, die von zwei unabhängigen, erfahrenen und in Bezug auf klinische und DECT-Informationen verblindeten Radiologen ausgewertet wurde, diente dabei als Referenzstandard. Sensitivität und Spezifität waren die wichtigsten Kennzahlen der Diagnoseleistung.
Ergebnisse: Insgesamt wurden 112 Bandscheibenvorfälle der Lendenwirbelsäule in der MRT erfasst. VNCa zeigte insgesamt eine höhere Sensitivität (612 von 672 [91%] versus (vs.) 534 von 672 [80%]) und Spezifität (723 von 786 [92%] vs. 665 von 786 [85%]) zur Detektion eines lumbalen Bandscheibenvorfalls im Vergleich zur Standard-Computertomographie (CT) (alle Vergleiche, P < 0.001). Die Interrater-Reliabilität war „exzellent“ für VNCa und „gut“ für die Standard-CT (k = 0,82 vs. 0,67; P < 0.001). VNCa erreichte im Vergleich zum Standard-CT eine überlegene Diagnosesicherheit und Bildqualität bei niedrigerem Bildrauschen (alle Vergleiche, P < 0.001).
Schlussfolgerung: Farbkodierte Dual-Energy CT VNCa-Rekonstruktionen zeigen im Vergleich zur Standard-CT eine signifikant bessere diagnostische Genauigkeit und Sicherheit für die Detektion eines lumbalen Bandscheibenvorfalls.
Autophagy is a highly conserved catabolic process through which defective or otherwise harmful cellular components are targeted for degradation via the lysosomal route. Regulatory pathways, involving post-translational modifications such as phosphorylation, play a critical role in controlling this tightly orchestrated process. Here, we demonstrate that TBK1 regulates autophagy by phosphorylating autophagy modifiers LC3C and GABARAP-L2 on surface-exposed serine residues (LC3C S93 and S96; GABARAP-L2 S87 and S88). This phosphorylation event impedes their binding to the processing enzyme ATG4 by destabilizing the complex. Phosphorylated LC3C/GABARAP-L2 cannot be removed from liposomes by ATG4 and are thus protected from ATG4-mediated premature removal from nascent autophagosomes. This ensures a steady coat of lipidated LC3C/GABARAP-L2 throughout the early steps in autophagosome formation and aids in maintaining a unidirectional flow of the autophagosome to the lysosome. Taken together, we present a new regulatory mechanism of autophagy, which influences the conjugation and de-conjugation of LC3C and GABARAP-L2 to autophagosomes by TBK1-mediated phosphorylation.
Peri-implantitis: summary and consensus statements of group 3. The 6th EAO Consensus Conference 2021
(2021)
Objective: To evaluate the influence of implant and prosthetic components on peri-implant tissue health. A further aim was to evaluate peri-implant soft-tissue changes following surgical peri-implantitis treatment. Materials and methods: Group discussions based on two systematic reviews (SR) and one critical review (CR) addressed (i) the influence of implant material and surface characteristics on the incidence and progression of peri-implantitis, (ii) implant and restorative design elements and the associated risk for peri-implant diseases, and (iii) peri-implant soft-tissue level changes and patient-reported outcomes following peri-implantitis treatment. Consensus statements, clinical recommendations, and implications for future research were discussed within the group and approved during plenary sessions. Results: Data from preclinical in vivo studies demonstrated significantly greater radiographic bone loss and increased area of inflammatory infiltrate at modified compared to non-modified surface implants. Limited clinical data did not show differences between modified and non-modified implant surfaces in incidence or progression of peri-implantitis (SR). There is some evidence that restricted accessibility for oral hygiene and an emergence angle of >30 combined with a convex emergence profile of the abutment/prosthesis are associated with an increased risk for peri-implantitis (CR). Reconstructive therapy for peri-implantitis resulted in significantly less soft-tissue recession, when compared with access flap. Implantoplasty or the adjunctive use of a barrier membrane had no influence on the extent of peri-implant mucosal recession following peri-implantitis treatment (SR).
Das Hepatozelluläre Karzinom (HCC) steht weltweit an dritter Stelle tumorbedingter Todesursachen. Eine kurative Therapie durch Leberresektion oder Transplantation ist nur dann Erfolg versprechend, wenn der Patient in einem frühen Stadium diagnostiziert wird, in dem noch keine Fernmetastasen oder Gefäßinvasionen vorliegen. Die Ausbildung von Mikrometastasen sind mittels Bildgebung nicht detektierbar.
Mit Hilfe der „liquid biopsy“, einem Blutanalyseverfahren, das sich auf die Detektion zirkulierender Tumorzellen (CTCs) im Patientenblut fokussiert, ist es m glich, diese Tumorzellen im Anschluss an ihre Isolation auf ihre molekularen Eigenschaften hin zu untersuchen. Im Laufe des Metastasierungsprozesses kommt es zur De- und Repolarisierung der CTCs.
In der vorliegenden Promotionsarbeit wurde ein immunologisches Verfahren zur Detektion polarisierter Tumorzellen (p-CTCs) im Blut von Patienten mit HCC entwickelt. Dazu erfolgte zunächst die Isolation der CTCs mittels Dichtegradientverfahren (Oncoquick@, Fa. Greiner
bio-one) und die anschließende Immunfluoreszenzfärbung der CTCs mittels Anti-Ezrin-Alexa- Fluor 488 zum strukturellen Nachweis des zytoskelletalen Membranproteins Ezrin.
Anhand der Lokalisation des Ezrin innerhalb der CTCs war es m glich, die CTCs in polarisierte(p-CTC) und nicht-polarisierte Zellen (non-polarized CTC) zu unterteilen. Mit diesem Verfahren konnten in einem Zeitraum von Juni 2018 bis Januar 2019 Blutproben (5 ml/Patient) von 15 Patienten mit HCC und von 10 Patienten mit einer nicht malignen Lebererkrankung (NMLD) untersucht werden.
Die häufigste Grunderkrankung war mit 30,43% (n=7) C2 Abusus, gefolgt von der NASH mit 26% (n=6) und DM Typ 2 mit Leberzirrhose mit 13,04% (n=2). 10 (66,6%) HCC-Patienten hatten eine Leberzirrhose. Bei einem Patienten war die Tumorgröße <2 cm, bei 7 Patienten zwischen 2-5 cm, und 7 Patienten hatten eine Tumorgröße von > 5 cm. Die meisten Patienten hatten ein BCLC-Stadium C (n=7), gefolgt von BCLC-Stadium B (n=4), und BCLC-Stadium D (n=3) und nur ein Patient hatte ein BCLC-Stadium 0.
In 14 (93,3%) HCC-Patienten konnten CTCs 1,2 CTCs/ml (0,4-3 CTCs/ml) nachgewiesen werden. Die Falsch-Positiv-Rate lag bei 0,2 isolierte Zelle/ml (p=0,0006). P-CTC konnten in 10/14(71%) HCC-Patienten identifiziert werden. Die HCC-Gruppe wies mit 0,42 p-CTCs/ml signifikant mehr p-CTCs als die NMLD-Patienten(0 p-CTCs/ml, p=0,002).
Eine negative Korrelation fand sich zwischen der Tumorgröße, BCLC-Stadium und der Anzahl polarisierter CTCs (r=-0,029, p=ns).
Die hier vorgestellten Daten zum Nachweis der Polarisierung von CTCs in Zusammenhang mit HCC könnten zukünftig eine Rolle in der molekularen Charakterisierung von CTCs und der
Diagnose des HCC darstellen.
Background: Treatment of acute stroke is highly time-dependent and performed by a multiprofessional, interdisciplinary team. Interface problems are expectable and issues relevant to patient safety are omnipresent. The Safety Attitudes Questionnaire (SAQ) is a validated and widely used instrument to measure patient safety climate. The objective of this study was to evaluate the SAQ for the first time in the context of acute stroke care. Methods: A survey was carried out during the STREAM trial (NCT 032282) at seven university hospitals in Germany from October 2017 to October 2018. The anonymous survey included 33 questions (5-point Likert scale, 1 = disagree to 5 = agree) and addressed the entire multiprofessional stroke team. Statistical analyses were used to examine psychometric properties as well as descriptive findings. Results: 164 questionnaires were completed yielding a response rate of 66.4%. 67.7% of respondents were physicians and 25.0% were nurses. Confirmatory Factor Analysis revealed that the original 6-factor structure fits the data adequately. The SAQ for acute stroke care showed strong internal consistency (α = 0.88). Exploratory analysis revealed differences in scores on the SAQ dimensions when comparing physicians to nurses and when comparing physicians according to their duration of professional experience. Conclusion: The SAQ is a helpful and well-applicable tool to measure patient safety in acute stroke care. In comparison to other high-risk fields in medicine, patient safety climate in acute stroke care seems to be on a similar level with the potential for further improvements. Trial registration: www.ClinicalTrials.gov Identifier: NCT032282.
Hematopoietic stem cell transplantation (HSCT) is widely used in pediatric patients as a successful curative therapy for life-threatening conditions. The treatment is intensive, with risks of serious complications and lethal outcomes. This study aimed to provide insight into current data on the place and cause of death of transplanted children, the available specialized pediatric palliative care services (SPPCS), and what services HSCT professionals feel the SPPCS team should provide. First, a retrospective database analysis on the place and cause of death of transplanted pediatric HSCT patients was performed. Second, a survey was performed addressing the availability of and views on SPPCS among HSCT professionals. Database analysis included 233 patients of whom the majority died in-hospital: 38% in the pediatric intensive care unit, 20% in HSCT units, 17% in other hospitals, and 14% at home or in a hospice (11% unknown). For the survey, 98 HSCT professionals from 54 centers participated. Nearly all professionals indicated that HSCT patients should have access to SPPCS, especially for pain management, but less than half routinely referred to this service at an early stage. We, therefore, advise HSCT teams to integrate advance care planning for pediatric HSCT patients actively, ideally from diagnosis, to ensure timely SPPCS involvement and maximize end-of-life preparation.
Platelets comprise a highly interactive immune cell subset of the circulatory system traditionally known for their unique haemostatic properties. Although platelets are considered as a vault of growth factors, cytokines and chemokines with pivotal role in vascular regeneration and angiogenesis, the exact mechanisms by which they influence vascular endothelial cells (ECs) function remain underappreciated. In the present study, we examined the role of human IL-17A/IL-17RA axis in platelet-mediated pro-angiogenic responses. We reveal that IL-17A receptor (IL-17RA) mRNA is present in platelets transcriptome and a profound increase is documented on the surface of activated platelets. By quantifying the protein levels of several factors, involved in angiogenesis, we identified that IL-17A/IL17RA axis selectively induces the release of vascular endothelial growth factor, interleukin -2 and -4, as well as monocyte chemoattractant protein -1 from treated platelets. However, IL-17A exerted no effect on the release of IL-10, an anti-inflammatory factor with potentially anti-angiogenic properties, from platelets. Treatment of human endothelial cell two-dimensional tubule networks or three-dimensional spheroid and mouse aortic ring structures with IL-17A-induced platelet releasate evoked pro-angiogenic responses of ECs. Our findings suggest that IL-17A may critically affect platelet release of pro-angiogenic factors driving ECs towards a pro-angiogenic state.
Container-breeding Aedes spp. (Diptera: Culicidae) mosquitoes can be surveilled at low cost using ovitraps. Hence, this method is a preferred monitoring approach of dengue vectors in low-resource settings. The ovitraps consist of a cup filled with water and an oviposition substrate for female mosquitoes. The attractiveness of the substrates for female mosquitoes can greatly differ due to differences in texture, color, and smell of the materials used. We compare four oviposition substrates, which are all low priced, easy to transport, and easy to purchase, to maximize the success of Aedes egg sampling. Sampled egg material is often reared to adulthood for further taxonomic identification and transported to (international) laboratories for specialized vector research. Here we introduce a transport technique for sampled eggs. In addition, we explored the impact of international transport by means of a bilateral hatching experiment in Nepal, the country of origin, and in Germany, in a laboratory specialized in ecophysiological research. The best low-cost oviposition substrate for the dengue vectors Aedes albopictus (Skuse) and Aedes aegypti (L.) was found to be a white cotton sheet. The introduced transport technique of sampled eggs is easy to build from laboratory and household materials and ensures good transport conditions (i.e., temperature and relative humidity). Even under good temperature (17.4–31.0 °C) and humidity conditions (58.9–94.2%), hatching success of eggs was found to be reduced after international transport to Germany when compared to the hatching success of eggs in Nepal. We postulate that air pressure during international transport may have reduced the hatching success and strongly recommend pressure-regulated transport boxes for egg transport via airplane. As the proposed operation procedure is useful in assisting the monitoring of Ae. albopictus and Ae. aegypti in low-resource settings, Aedes researchers are encouraged to follow it for the sampling and transport of Aedes eggs.
Aim: The aim of this study is to utilize the niche measurement guidelines outlined by Jordans et al. in order to establish normal values and accurate description of caesarean section scars in a normal population. After defining the normal distribution, abnormal pregestational scar characteristics will be identified for predicting adverse pregnancy outcomes. Methods: This is a prospective observational multicenter clinical study where women with a history of only one caesarean section and yet open family planning are enrolled. The uterine length, cervical length, niche length, niche depth, niche width, residual myometrial thickness, endometrial thickness, scar to internal os distance, anterior myometrial thickness superior and inferior to the scar and the posterior myometrial thickness opposite the scar, superior and inferior to it are measured in a pregestational uterus. The lower uterine segment is measured over a length of 3 cm during subsequent pregnancy and followed up until delivery. Results: Data from 500 patients will yield normal distribution curves for all predefined measurements. Establishing a correlation between deviations from the normal measures and adverse events would be instrumental for counseling women regarding subsequent pregnancy and mode of delivery.
Conclusion: This study will demonstrate the changes of the post-caesarean scar from a non-pregnant uterus until delivery and can confirm the importance of the scar characteristics in predicting pregnancy outcome.
Background: Brodalumab is a fully human monoclonal immunoglobulin IgG2 antibody that binds to the human IL-17 receptor subunit A and by that inhibits the biologic action of IL-17A, IL-17F, IL-17C and IL-17E. Therapy with fumaric acid esters (FAE) is a well established and widely used first-line systemic treatment for subjects with moderate-to-severe plaque psoriasis. Objectives: To compare brodalumab to FAE in terms of clinical efficacy, patient-reported outcomes and safety in subjects with moderate-to-severe plaque psoriasis who were naïve to systemic treatment. Methods: Eligible subjects were randomized 1 : 1 to 210 mg brodalumab injections or oral FAE according to product label in this 24-week, open-label, assessor-blinded, multi-centre, head-to-head phase 4 trial. The primary endpoints were having PASI75 and having sPGA score of 0 or 1 (sPGA 0/1). Subjects with missing values for the primary endpoints were considered non-responders. Results: A total of 210 subjects were randomized. 91/105 subjects completed brodalumab treatment and 58/105 subjects completed FAE treatment. At Week 24, significantly more subjects in the brodalumab group compared to the FAE group had PASI75 (81.0% vs. 38.1%, P < 0.001) and sPGA 0/1 (64.8% vs. 20.0%, P < 0.001). In the brodalumab group, the median time to both PASI75 and to PASI90 was significantly shorter than in the FAE group (4.1 weeks vs. 16.4 weeks, and 7.4 weeks vs. 24.4 weeks, respectively, P < 0.0001 for both). The rate of adverse events was lower in subjects treated with brodalumab compared to subjects treated with FAE (616.4 vs. 1195.8 events per 100 exposure years). No new safety signals were detected for brodalumab. Conclusions: Brodalumab was associated with rapid and significant improvements in signs and symptoms of moderate-to-severe plaque psoriasis, with a superior efficacy profile to what was observed with FAE in systemic-naïve subjects over 24 weeks.
Background: One of the lesser recognized complications of diabetes mellitus are musculoskeletal (MSK) complications of the upper and lower extremity. No prevalence studies have been conducted in general practice. Thus, the aim of this study was to investigate the prevalence of upper extremity MSK disorders in patients with type 2 diabetes (T2DM) in the Netherlands. Methods: We conducted a cross-sectional study with two different approaches, namely a representative Dutch primary care medical database study and a questionnaire study among patients with T2DM. Results: In the database study, 2669 patients with T2DM and 2669 non-diabetes patients were included. MSK disorders were observed in 16.3% of patients with T2DM compared to 11.2% of non-diabetes patients (p < 0.001, OR 1.53, 95% CI 1.31, 1.80). In the questionnaire study, 200 patients with T2DM were included who reported a lifetime prevalence of painful upper extremity body sites for at least four weeks of 67.3%. Conclusion: We found that upper extremity MSK disorders have a high prevalence in Dutch patients with T2DM presenting in general practice. The prevalence ranges from 16% based on GP registered disorders and complaints to 67% based on self-reported diagnosis and pain. Early detection and treatment of these disorders may play a role in preventing the development of chronic MSK disorders.
Biological exploration of early biomarkers for chronic kidney disease (CKD) in (pre)diabetic individuals is crucial for personalized management of diabetes. Here, we evaluated two candidate biomarkers of incident CKD (sphingomyelin (SM) C18:1 and phosphatidylcholine diacyl (PC aa) C38:0) concerning kidney function in hyperglycemic participants of the Cooperative Health Research in the Region of Augsburg (KORA) cohort, and in two biofluids and six organs of leptin receptor-deficient (db/db) mice and wild type controls. Higher serum concentrations of SM C18:1 and PC aa C38:0 in hyperglycemic individuals were found to be associated with lower estimated glomerular filtration rate (eGFR) and higher odds of CKD. In db/db mice, both metabolites had a significantly lower concentration in urine and adipose tissue, but higher in the lungs. Additionally, db/db mice had significantly higher SM C18:1 levels in plasma and liver, and PC aa C38:0 in adrenal glands. This cross-sectional human study confirms that SM C18:1 and PC aa C38:0 associate with kidney dysfunction in pre(diabetic) individuals, and the animal study suggests a potential implication of liver, lungs, adrenal glands, and visceral fat in their systemic regulation. Our results support further validation of the two phospholipids as early biomarkers of renal disease in patients with (pre)diabetes.
Electroencephalography (EEG) represents a widely established method for assessing altered and typically developing brain function. However, systematic studies on EEG data quality, its correlates, and consequences are scarce. To address this research gap, the current study focused on the percentage of artifact-free segments after standard EEG pre-processing as a data quality index. We analyzed participant-related and methodological influences, and validity by replicating landmark EEG effects. Further, effects of data quality on spectral power analyses beyond participant-related characteristics were explored. EEG data from a multicenter ADHD-cohort (age range 6 to 45 years), and a non-ADHD school-age control group were analyzed (ntotal = 305). Resting-state data during eyes open, and eyes closed conditions, and task-related data during a cued Continuous Performance Task (CPT) were collected. After pre-processing, general linear models, and stepwise regression models were fitted to the data. We found that EEG data quality was strongly related to demographic characteristics, but not to methodological factors. We were able to replicate maturational, task, and ADHD effects reported in the EEG literature, establishing a link with EEG-landmark effects. Furthermore, we showed that poor data quality significantly increases spectral power beyond effects of maturation and symptom severity. Taken together, the current results indicate that with a careful design and systematic quality control, informative large-scale multicenter trials characterizing neurophysiological mechanisms in neurodevelopmental disorders across the lifespan are feasible. Nevertheless, results are restricted to the limitations reported. Future work will clarify predictive value.
Coagulation factor XIII (FXIII) is a protransglutaminase which plays an important role in clot stabilization and composition by cross-linking the α- and γ-chains of fibrin and increasing the resistance of the clot to mechanical and proteolytic challenges. In this study, we selected six DNA aptamers specific for activated FXIII (FXIIIa) and investigated the functional characterization of FXIIIa after aptamer binding. One of these aptamers, named FA12, efficiently captures FXIIIa even in the presence of zymogenic FXIII subunits. Furthermore, this aptamer inhibits the incorporation of FXIII and α2-antiplasmin (α2AP) into fibrin(ogen) with IC50-values of 38 nM and 17 nM, respectively. In addition to FA12, also another aptamer, FA2, demonstrated significant effects in plasma-based thromboelastometry (rotational thromboelastometry analysis, ROTEM)-analysis where spiking of the aptamers into plasma decreased clot stiffness and elasticity (p < 0.0001). The structure–function correlations determined by combining modeling/docking strategies with quantitative in vitro assays revealed spatial overlap of the FA12 binding site with the binding sites of two FXIII substrates, fibrinogen and α2AP, while FA2 binding sites only overlap those of fibrinogen. Taken together, these features especially render the aptamer FA12 as an interesting candidate molecule for the development of FXIIIa-targeting therapeutic strategies and diagnostic assays.
Simple Summary: Children with acute myeloid leukemia (AML) experience high relapse rates of about 30%; still, survival rates following the first relapse are encouraging. Hence, it is critically important to examine the consequences of a second relapse; however, little is known about this subgroup of patients. This retrospective population-based analysis intends to describe response, survival and prognostic factors relevant for the survival of children with second relapse of AML. Treatment approaches include many different therapeutic regimens, including palliation and intensive treatment with curative intent (63% of the patients). Survival is poor; however, patients who respond to reinduction attempts can be rescued with subsequent hematopoietic stem cell transplantation. We deciphered risk factors, such as short time interval from first to second relapse below one year as being associated with a poor outcome. This analysis will help to improve future international treatment planning and patient care of children with advanced AML.
Abstract: Successful management of relapse is critical to improve outcomes of children with acute myeloid leukemia (AML). We evaluated response, survival and prognostic factors after a second relapse of AML. Among 1222 pediatric patients of the population-based AML-Berlin–Frankfurt–Munster (BFM) study group (2004 until 2017), 73 patients met the quality parameters for inclusion in this study. Central review of source documentation warranted the accuracy of reported data. Treatment approaches included palliation in 17 patients (23%), intensive therapy with curative intent (n = 46, 63%) and other regimens (n = 10). Twenty-five patients (35%) received hematopoietic stem cell transplantation (HSCT), 21 of whom (88%) had a prior HSCT. Survival was poor, with a five-year probability of overall survival (pOS) of 15 ± 4% and 31 ± 9% following HSCT (n = 25). Early second relapse (within one year after first relapse) was associated with dismal outcome (pOS 2 ± 2%, n = 44 vs. 33 ± 9%, n = 29; p < 0.0001). A third complete remission (CR) is required for survival: 31% (n = 14) of patients with intensive treatment achieved a third CR with a pOS of 36 ± 13%, while 28 patients (62%) were non-responders (pOS 7 ± 5%). In conclusion, survival is poor but possible, particularly after a late second relapse and an intensive chemotherapy followed by HSCT. This analysis provides a baseline for future treatment planning.
Simple Summary: The incidence of brain metastases from breast cancer is increasing and the treatment is still a major challenge. Several scores have been developed in order to estimate the prognosis of patients with brain metastases by objective criteria. Here, we validated all three published graded-prognostic-assessment (GPA)-scores in a subcohort of 882 breast cancer patients with brain metastases in the Brain Metastases in the German Breast Cancer (BMBC) registry. Although all three available GPA-scores were associated with OS, they all show limitations mainly in predicting short-term (below 3 months) survival but also in long-term (above 12 months) survival. We discuss the test performances of all scores in our work and provide evidence how physicians should use them as a tool to select patients for different treatment options.
Abstract: Several scores have been developed in order to estimate the prognosis of patients with brain metastases (BM) by objective criteria. The aim of this analysis was to validate all three published graded-prognostic-assessment (GPA)-scores in a subcohort of 882 breast cancer (BC) patients with BM in the Brain Metastases in the German Breast Cancer (BMBC) registry. The median age at diagnosis of BM was 57 years. All in all, 22.3% of patients (n = 197) had triple-negative, 33.4% (n = 295) luminal A like, 25.1% (n = 221) luminal B/HER2-enriched like and 19.2% (n = 169) HER2 positive like BC. Age ≥60 years, evidence of extracranial metastases (ECM), higher number of BM, triple-negative subtype and low Karnofsky-Performance-Status (KPS) were all associated with worse overall survival (OS) in univariate analysis (p < 0.001 each). All three GPA-scores were associated with OS. The breast-GPA showed the highest probability of classifying patients with survival above 12 months in the best prognostic group (specificity 68.7% compared with 48.1% for the updated breast-GPA and 21.8% for the original GPA). Sensitivities for predicting 3 months survival were very low for all scores. In this analysis, all GPA-scores showed only moderate diagnostic accuracy in predicting the OS of BC patients with BM.
Shikonin reduces growth of docetaxel-resistant prostate cancer cells mainly through necroptosis
(2021)
Simple Summary: Prostate carcinoma (PCa) is the most common tumor in men with an increasing age-associated risk. Several therapy strategies, one of which is docetaxel (DX) chemotherapy, have been established. However, due to the development of therapy resistance, in which chemotherapy no longer effectively combats the cancer, advanced, metastasized PCa with a poor prognosis may become manifested and therapy inevitably fails. Thus, new treatment options are urgently needed. Shikonin (SHI), from Traditional Chinese Medicine, has revealed promising antitumor activity in several tumor entities. In the current study, the impact of SHI on four therapy-sensitive and four respective DX-resistant PCa cell lines was determined. SHI induced growth inhibition mainly by necroptosis, a type of cell death, in all the tested therapy-sensitive, but more importantly, DX-resistant PCa cell lines. Corresponding molecular alterations contributing to growth inhibition after SHI exposure were found. SHI could, therefore, be a promising additive in treating advanced PCa.
Abstract: The prognosis for advanced prostate carcinoma (PCa) remains poor due to development of therapy resistance, and new treatment options are needed. Shikonin (SHI) from Traditional Chinese Medicine has induced antitumor effects in diverse tumor entities, but data related to PCa are scarce. Therefore, the parental (=sensitive) and docetaxel (DX)-resistant PCa cell lines, PC3, DU145, LNCaP, and 22Rv1 were exposed to SHI [0.1–1.5 μM], and tumor cell growth, proliferation, cell cycling, cell death (apoptosis, necrosis, and necroptosis), and metabolic activity were evaluated. Correspondingly, the expression of regulating proteins was assessed. Exposure to SHI time- and dose-dependently inhibited tumor cell growth and proliferation in parental and DX-resistant PCa cells, accompanied by cell cycle arrest in the G2/M or S phase and modulation of cell cycle regulating proteins. SHI induced apoptosis and more dominantly necroptosis in both parental and DX-resistant PCa cells. This was shown by enhanced pRIP1 and pRIP3 expression and returned growth if applying the necroptosis inhibitor necrostatin-1. No SHI-induced alteration in metabolic activity of the PCa cells was detected. The significant antitumor effects induced by SHI to parental and DX-resistant PCa cells make the addition of SHI to standard therapy a promising treatment strategy for patients with advanced PCa.
Vascular biotransformation of organic nitrates is independent of cytochrome P450 monooxygenases
(2021)
Background and Purpose: Organic nitrates such as nitroglycerin (NTG) or pentaerythritol tetranitrate (PETN) have been used for over a century in the treatment of angina or ischaemic heart disease. These compounds are prodrugs which release their nitrovasodilators upon enzymic bioactivation by aldehyde dehydrogenase (ALDH2) or cytochromes P450 (CYP). Whereas ALDH2 is known to directly activate organic nitrates in vessels, the contribution of vascular CYPs is unknown and was studied here.
Experimental Approach: As all CYPs depend on cytochrome P450 reductase (POR) as electron donor, we generated a smooth muscle cell-specific, inducible knockout mouse of POR (smcPOR−/−) to investigate the contribution of POR/CYP to vascular biotransformation of organic nitrates.
Key Results: Microsomes containing recombinant CYPs expressed in human vascular tissues released nitrite from NTG and PETN with CYP2C9 and CYP2C8 being most efficient. SFK525, a CYP suicide inhibitor, blocked this effect. smcPOR−/− mice exhibited no obvious cardiovascular phenotype (normal cardiac weight and endothelium-dependent relaxation) and plasma and vascular nitrite production was similar to control (CTL) animals. NTG- and PETN-induced relaxation of isolated endothelium-intact or endothelium-denuded vessels were identical between CTL and smcPOR−/−. Likewise, nitrite release from organic nitrates in aortic rings was not affected by deletion of POR in smooth muscle cells (SMCs). In contrast, inhibition of ALDH2 by benomyl (10 μM) inhibited NTG-induced nitrite production and relaxation. Deletion of POR did not modulate this response.
Conclusions and Implications: Our data suggest that metabolism by vascular CYPs does not contribute to the pharmacological function of organic nitrates.
Parent ratings are often used for screening during the diagnostic evaluation of anxiety disorders. Clinically, it is important to correctly differentiate between anxiety and other psychiatric disorders and to distinguish specific anxiety disorders. The present study examined the validity of the screening results obtained by the Parent Questionnaire for Anxiety and Obsessive-Compulsive Disorders (FBB-ANZ). We exam- ined whether the FBB-ANZ discriminated (1) anxiety and other psychiatric disorders and (2) specific anxiety disorders in children and adoles- cents using ROC analyses. 972 parents of 4;00–11;11-year-old children and 12;00–17;11-year-old adolescents with anxiety disorders, depres- sive episodes, or externalizing disorders completed the FBB-ANZ. Discrimination of anxiety disorders and externalizing disorders in children (AUC = .72) and adolescents (AUC = .76) as well as depressive episodes in children (AUC = .77) was moderate. Good discrimination of different anxiety disorders was found only for separation anxiety in children (AUC = .84) and adolescents (AUC = .87). The results indicate the limited di- agnostic benefit of parent ratings for discriminating different anxiety disorders in children and adolescents. Potential explanations for the re- sults are critically discussed.
Background: Transplantation of human corneal tissue is associated with the potential risk of transmittance of viral infections. In accordance with European directives and federal laws, in Germany each tissue donor has to be tested for infectious diseases such as hepatitis B and C virus (HBV and HCV) and human immunodeficiency virus (HIV) infection. However, most of the currently available CE-marked serologic and nucleic acid screening systems are only validated for antemortem blood. Methods: Twenty related and paired ante- and postmortem blood samples from cornea donors were obtained and subsequently analyzed for hepatitis B surface antigen (HBsAg), hepatitis B antibody (anti-HBc), anti-HCV, HCV RNA, anti-HIV-1/2, and HIV p24 Ag using Abbott test systems. The sera were also spiked with reference materials in concentrations giving low and high positivity for HBV, HCV, and HIV markers. Results: The spiked ante- and postmortem sera from related donors showed similar results for HBsAg, anti-HBc, anti-HCV, HCV RNA, anti-HIV, and HIV p24 Ag, indicating a high stability of viral markers in cadaveric specimens. Three cornea donors had a medical history of HBV infection and revealed anti-HBc at similar levels in the ante- and postmortem sera. In addition, there was a single postmortem sample demonstrating a weak signal of anti-HIV-1 and HIV-1 p24 Ag. False-positive or false-negative results were not detected. The results obtained with the Abbott ARCHITECT analyzer and Abbott RealTime HCV PCR showed no significant differences. Conclusion: The analyzed screening assays are suitable for the detection of infectious markers of HBV, HCV, and HIV at similar levels in spiked ante- and postmortem sera from cornea donors.
Lower leg fractures in children and adolescents - comparison of conservative vs. ECMES treatment
(2021)
Background: Lower leg fractures are one of the most common fractures in pediatric age. In general, treatment of lower leg fractures is predominantly non-operative, requiring clinical and radiological controls. Nevertheless, it can be observed that in recent years tibial shaft fractures have increasingly been treated surgically. The aim of the present study is to investigate treatment strategies in the context of different fracture types of the lower leg Methods: In this retrospective chart review, we analyzed 168 children with a diaphyseal fracture of the lower leg admitted to a trauma center between 2005 and 2017. The fractures were classified according to the AO Pediatric Comprehensive Classification of Long Bone Fractures (AO-PCCF). Results: The frequency of fractures based on the AO-PCCF classification was as follows: Simple oblique fracture of the tibia (43.5%, n = 73), hereof 32 toddler's fractures, multifragmentary oblique fracture of the tibia in 14.3% (n = 24) and simple oblique fracture of both, tibia and fibula in 18 patients (10.7%). Most pediatric fractures were treated conservatively by cast (n = 125). Thirty-seven patients received an ECMES, whereas 3 patients were treated with an external fixator and also 3 fractures were stabilized by plate osteosynthesis. Conservatively treated patients were significantly younger (mean age 6.0) compared to patients treated with ECMES (mean age 10.2) or plate osteosynthesis (PO)/external fixator (EF) (mean age 11.3), even if toddler's fractures (mean age 2.0) are excluded (mean age 7.4). There was no difference in time to full weight-bearing, hospitalization of patients treated with ECMES compared to conservative therapy although ECMES-treated fractures show more instability. The consolidation time was significantly higher in ECMES treated patients compared to conservative therapy. Conclusion: Pediatric patients (≤4 years) with lower leg fractures most often showed simple oblique fractures of the tibia, half of them toddler's fractures, which were treated predominantly by conservative therapy. All in all, the consolidation time was longer in intramedullary nailing (ECMES) than in conservative therapy. Nevertheless, time to full weight bearing and duration of cast was the same in both groups, even though ECMES treated fractures show more instability.
Background: The alpha7 nicotinic acetylcholine receptor (Chrna7) plays an essential anti-inflammatory role in immune homeostasis and was recently found on mast cells (MC). Psychosocial stress can trigger MC hyperactivation and increases pro-inflammatory cytokines in target tissues such as the skin. If the cholinergic system (CS) and Chrna7 ligands play a role in these cascades is largely unknown. Objective: To elucidate the role of the CS in the response to psychosocial stress using a mouse-model for stress-triggered cutaneous inflammatory circuits. Methods: Key CS markers (ACh, Ch, SLURP-1, SLURP-2, Lynx1, Chrm3, Chrna7, Chrna9, ChAT, VAChT, Oct3, AChE, and BChE) in skin and its MC (sMC), MC activation, immune parameters (TNFα, IL1β, IL10, TGFβ, HIF1α, and STAT3) and oxidative stress were analyzed in skin from 24 h noise-stressed mice and in cultured MC (cMC) from C57BL/6 or Chrna7-Knockout mice. Results: First, Chrna7 and SLURP-1 mRNA were exclusively upregulated in stressed skin. Second, histomorphometry located Chrna7 and SLURP-1 in nerves and sMC and demonstrated upregulated contacts and increased Chrna7+ sMC in stressed skin, while 5 ng/mL SLURP-1 degranulated cMC. Third, IL1β+ sMC were high in stressed skin, and while SLURP-1 alone had no significant effect on cMC cytokines, it upregulated IL1β in cMC from Chrna7-KO and in IL1β-treated wildtype cMC. In addition, HIF1α+ sMC were high in stressed skin and Chrna7-agonist AR-R 17779 induced ROS in cMC while SLURP-1 upregulated TNFα and IL1β in cMC when HIF1α was blocked. Conclusions: These data infer that the CS plays a role in the regulation of stress-sensitive inflammatory responses but may have a surprising pro-inflammatory effect in healthy skin, driving IL1β expression if SLURP-1 is involved.
Complement has been considered as an important factor impacting the host–pathogen association of spirochetes belonging to the Borrelia burgdorferi sensu lato complex, and may play a role in the spirochete’s ecology. Birds are known to be important hosts for ticks and in the maintenance of borreliae. Recent field surveys and laboratory transmission studies indicated that certain avian species act as reservoir hosts for different Borrelia species. Nevertheless, our current understanding of the molecular mechanisms determining host tropism of Borrelia is still in its fledgling stage. Concerning the role of complement in avian-host tropism, only a few bird species and Borrelia species have been analysed so far. Here, we performed in vitro serum bactericidal assays with serum samples collected from four bird species including the European robin Erithacus rubecula, the great tit Parus major, the Eurasian blackbird Turdus merula, and the racing pigeon Columba livia, as well as four Borrelia species (B. afzelii, B. garinii, B. valaisiana, and B. burgdorferi sensu stricto). From July to September 2019, juvenile wild birds were caught using mist nets in Portugal. Racing pigeons were sampled in a loft in October 2019. Independent of the bird species analysed, all Borrelia species displayed an intermediate serum-resistant or serum-resistant phenotype except for B. afzelii challenged with serum from blackbirds. This genospecies was efficiently killed by avian complement, suggesting that blackbirds served as dead-end hosts for B. afzelii. In summary, these findings suggest that complement contributes in the avian–spirochete–tick infection cycle and in Borrelia-host tropism.
Background: To investigate patients’ perspectives on polypharmacy and the use of a digital decision support system to assist general practitioners (GPs) in performing medication reviews. Methods: Qualitative interviews with patients or informal caregivers recruited from participants in a cluster-randomized controlled clinical trial (cRCT). The interviews were transcribed verbatim and analyzed using thematic analysis. Results: We conducted 13 interviews and identified the following seven themes: the patients successfully integrated medication use in their everyday lives, used medication plans, had both good and bad personal experiences with their drugs, regarded their healthcare providers as the main source of medication-related information, discussed medication changes with their GPs, had trusting relationships with them, and viewed the use of digital decision support tools for medication reviews positively. No unwanted adverse effects were reported. Conclusions: Despite drug-related problems, patients appeared to cope well with their medications. They also trusted their GPs, despite acknowledging polypharmacy to be a complex field for them. The use of a digital support system was appreciated and linked to the hope that reasons for selecting specific medication regimens would become more comprehensible. Further research with a more diverse sampling might add more patient perspectives.
Background: To assess the potential of radiomic features to quantify components of blood in intraaortic vessels to non-invasively predict moderate-to-severe anemia in non-contrast enhanced CT scans. Methods: One hundred patients (median age, 69 years; range, 19–94 years) who received CT scans of the thoracolumbar spine and blood-testing for hemoglobin and hematocrit levels ± 24 h between 08/2018 and 11/2019 were retrospectively included. Intraaortic blood was segmented using a spherical volume of interest of 1 cm diameter with consecutive radiomic analysis applying PyRadiomics software. Feature selection was performed applying analysis of correlation and collinearity. The final feature set was obtained to differentiate moderate-to-severe anemia. Random forest machine learning was applied and predictive performance was assessed. A decision-tree was obtained to propose a cut-off value of CT Hounsfield units (HU). Results: High correlation with hemoglobin and hematocrit levels was shown for first-order radiomic features (p < 0.001 to p = 0.032). The top 3 features showed high correlation to hemoglobin values (p) and minimal collinearity (r) to the top ranked feature Median (p < 0.001), Energy (p = 0.002, r = 0.387), Minimum (p = 0.032, r = 0.437). Median (p < 0.001) and Minimum (p = 0.003) differed in moderate-to-severe anemia compared to non-anemic state. Median yielded superiority to the combination of Median and Minimum (p(AUC) = 0.015, p(precision) = 0.017, p(accuracy) = 0.612) in the predictive performance employing random forest analysis. A Median HU value ≤ 36.5 indicated moderate-to-severe anemia (accuracy = 0.90, precision = 0.80). Conclusions: First-order radiomic features correlate with hemoglobin levels and may be feasible for the prediction of moderate-to-severe anemia. High dimensional radiomic features did not aid augmenting the data in our exemplary use case of intraluminal blood component assessment.
Die Sonografie wird als primäre Untersuchungsmethode zur Abklärung vielfältiger Krankheitsbilder eingesetzt und hat sich auch in Leitlinien etabliert. Die Rolle der Sonografie in der Geriatrie ist weniger bekannt und nicht systematisch untersucht.
Ziel der Studie war die Evaluierung der Sonografie als routinemäßig eingesetztes Verfahren und erweiterte körperliche Untersuchung bei geriatrischen Patienten in der medizinischen Akutversorgung. Alle sogenannten geriatrischen Assessments und auch die Sonografie als Screening-Untersuchung erfolgten unabhängig von der Symptomatik des geriatrischen Patienten. Die Befunde wurden mit einem hand-held ultrasound device (HHUSD) und einem high-end ultrasound (HEUS) erhoben und dann verglichen. Die HEUS-Ergebnisse wurden als Goldstandard angesehen. Die Untersuchungen mit HEUS erfolgten meist zu einem späteren Zeitpunkt als mit HHUSD; in der Regel in einem Zeitraum von bis zu sieben Tagen.
Es handelt sich um eine prospektive Studie, die 86 Patienten in einem Zeitraum von 10 Monaten eingeschlossen hat. Die Untersucherin und Doktorandin stellte Folgendes dar: Das Abdomen und die basalen Abschnitte des Thorax sowie die Schilddrüse. Zusätzlich erfolgte eine elastografische Untersuchung der Leber mittels FibroScan.
Die Ultraschalluntersuchung war bei 22/86 (25,6 %) Patienten aufgrund der Symptomatik indiziert und erfolgte bei 64/86 (74,4 %) Patienten als Screening, also ohne klinische Fragestellung. Die Indikationen der Untersuchungen waren: Tumorsuche (8/86 (9,3 %)), Anämie (5/86 (5,8 %)), Leberwert-Erhöhung (5/86 (5,8 %)), Dyspnoe (5/86 (5,8 %)), Frage nach Milzpathologien (2/86 (2,3 %)), Gewichtsverlust (1/86 (1,2 %)), Infektfokussuche (1/86 (1,2 %)), Durchfall (1/86 (1,2 %)), Frage nach intraabdominalem Hämatom (1/86 (1,2 %)) und Kontrolle bei bekanntem Bauchaortenaneurysma (1/86 (1,2 %)). Bei einigen Patienten kamen mehrere Fragestellungen vor.
Die Befunde, die am häufigsten gefunden wurden, waren: Cholezystolithiasis (28/86 (32,6 %); mit HHUSD 5 falsch negative Ergebnisse), rechtsseitiger Pleuraerguss (27/86 (31,4 %); 5 falsch positive Ergebnisse mit HHUSD), Schilddrüsenknoten (26/86 (30,2 %); 2 falsch negative und 1 falsch positiver Befunde mit HHUSD), Nierenzysten (24/86 (27,9 %); 6 falsch negative Ergebnisse mit HHUSD) und Fettleber (23/86 (26,7 %); 3 falsch negative Befunde mit HHUSD). Von 64/86 (74,4 %) untersuchten Patienten ergab sich bei 8/86 (9,3 %) eine therapeutische Konsequenz. Die wichtigsten Befunde, die mit HHUSD übersehen wurden waren: 2 zystische Formationen im Pankreas (2/86 (2,3 %); mit HEUS insgesamt (6/86 (7,0 %)), eine Lebezirrhose (mit HEUS 2/86 (2,3 %)), eine Choledocholithiasis (1/86 (1,2 %); mit HEUS 2/86 (2,3 %)) und ein Lungeninfiltrat (1/86 (1,2 %); mit HEUS 2/86 (2,3 %)). Alle übersehenen Befunde hatten keine dringende therapeutische Konsequenz, so dass die point of care Sonografie (POCUS) hier ausreichend war, um die „ja/nein“-Fragen zu klären.
Bei 65/86 (75,6 %) Patienten war eine Messung der Lebersteifigkeit mittels FibroScan erfolgreich.
Es gab keine Interobserver-Variabilität. Die Untersucherin war eine Fachärztin für Innere Medizin aber keine DEGUM-ausgebildete Ultraschallerin.
Insgesamt zeigte sich eine ausreichende bis gute Übereinstimmung der erhobenen Befunde zwischen HHUSD und HEUS. Die POCUS-Untersuchung lieferte in den meisten Fällen eine Antwort auf die häufigsten Fragestellungen in der Geriatrie (wie Hydratationsstatus, Harnverhalt). Weiterhin konnte die Behandlung bei zufällig gescreenten Patienten optimiert werden. Zur Bestimmung der Organgröße konnte ebenfalls eine gute Korrelation der beiden Geräte festgestellt werden, so dass sich die alleinige Untersuchung mit HHUSD in diesen Fällen ausreichend gezeigt hätte. Ein routinemäßiger Einsatz der Sonografie in der Geriatrie muss in weiteren Studien untersucht werden. Da es sich bei geriatrischen Patienten um multimorbide Patienten mit entsprechend angepassten therapeutischen Zielen handelt, hatten mehrere der erhobenen Befunde in dieser Studie zum Zeitpunkt der geriatrischen Behandlung keine therapeutische Konsequenz.
Mycophenolate-Mofetil (MMF) clinically used as CellCept is inserted as immunosuppressive xenobiotic drug for preventing transplantate rejection. It is well known that MMF works selectively through inhibiting the IMPDH which is an essential enzyme in the de novo pathway for biosynthesis of guanosine Nukleotides.
In this study, we investigated the effects of MMF on the astrocytes, because astrocytes are important glial cells of the CNS with various functions in the healthy tissue, such as being involved in the neuronal differentiation, axonal growth and regulation of the environmental composition. They also build up the scared tissue during acute CNS lesions by releasing neurotoxic substances such as NO and different inflammatory Zytokines, e.g. IL-1ß and TNF-a, which even influence the microglial cell proliferation, migration and activity. Therefore, astrocytes are impressingly involved in the extent of the neuronal damage.
Our observations revealed an influence of astrocytic proliferation dependent on the concentration of the serum (10%, 5%, 2%, 1% and serum free medium) used for the in vitro cultivation: the more the serum part in the medium the more the extent of the cell proliferation. The proliferation of astrocytes cultured in serum free medium can be increased by Corticotropin Releasing Factor (CRF) 10µM and Guanosine application. Dose-dependent MMF led to a suppression of the astrocytic proliferation which is antagonisable with Guanosine only.
The number of the isolated proliferating astrocytes labeled by BrdU was significantly reduced after simultaneous treatment with serum (10% or 1%) and dose-dependent MMF (10µg/ ml, 1µg/ ml and 0,1µg/ ml) application, whereas LPS showed no effect on the proliferating rate. But, as measured by ELISA, with LPS conditioned medium contained relevant amounts of TNF-a and NO, but surprisingly not of IL-1ß. There were a significant reduction of cytokine and NO amounts determined in the astrocytic conditioned medium treated only with MMF dependent of the concentration (10µg/ml, 1µg/ml and 0,1µg/ml). Even the simultaneous treatment with LPS and MMF revealed compared to the LPS stimulated astrocytic group a measurable significant decrease of TNF-a. The treatment of the astrocytic cultures with guanosine lifted up the effects of MMF on TNF-a secretion. Therefore, we conclude, that the immunosuppressive drug MMF might have a neuroprotective and scar formation modulating effect through the antiproliferative potency on astrocytic cells and modulating character of the microenvironment by influencing the TNF-a secretion. Moreover, these regulatory effect on microglial cells are described as suppression (Hailer NP,Wirjatijana F,Roser N,Hirschebeth GT,Korf HW,Dehghani F,2001).
Zielstellung: Es sollte im Rahmen dieser Arbeit geprüft werden ob (1) ein Zusammenhang zwischen einer radiologischen Beinlängendifferenz und einer veränderten Hüft- bzw. Kniegelenksbelastung bei Coxarthrosepatienten besteht. Des Weiteren galt es zu prüfen (2) ob die radiologisch-anatomische Beinachse bei Coxarthrosepatienten einen Einfluss auf die Gelenksbelastung von Hüfte und Knie habe und (3) ob sich in diesem Zusammenhang Unterschiede zwischen unilateral und bilateral betroffenem Patientenkollektiv darstellen ließe.
Hintergründe: Es konnte bereits gezeigt werden, dass Coxarthrosepatienten ein verändertes Gangbild aufweisen. Diese Veränderungen sind mitverantwortlich für eine veränderete Gelenkbelastung sowohl in Knie als auch Hüfte, sowohl im Vergleich zwischen betroffener und nicht betroffener Seite als auch im Vergleich zu hüftgesunden Normprobanden. Insbesondere bezüglich der Kniegelenksbelastung konnte bei den Betroffenen ein reduziertes Knieadduktionsmoment (KAM) während der Standphase nachgewiesen werden. Dies steht im Einklang mit der Beobachtung, dass Coxarthrosepatienten vermehrt eine laterale Kniearthrose auf der ipsilateralen Seite entwickeln. Coxarthrosepatienten zeigten darüber hinaus eine veränderte Beinachse, mit einer Tendenz hin zu einer Valgusfehlstellung. In wieweit insbesondere die proximale Beinachse einen Einfluss auf die alterierten Gelenkmomente hat, bleibt bislang jedoch offen. Zu bilateralen Patienten sind darüber hinaus nur wenige Daten vorliegend.
Methoden: Um die oben genannten Hypothesen zu prüfen wurden bei insgesamt 29 Patienten, bei welchen die Indikation für eine Hüfttotalendoprothese aufgrund einer fortgeschrittenen Coxarthrose gestellt wurde, eine instrumentelle Bewegungsanalyse sowie eine biplanare EOSRöntgenaufnahme, welche in diesem Zusammenhang die konventionelle präoperative Planungsaufnahme ersetzte, durchgeführt. Anschließend wurden die Daten, die aus der 3D EOS Rekonstruktion über die Beinachse gewonnen wurden, sowie die Ergebnisse der Bewegungsanalyse mit bereits zuvor erhobenen Normdaten sowie untereinander verglichen und statistisch analysiert.
Ergebnisse: Es zeigte sich, dass die Patienten eine bis auf MFA nicht von der Norm abweichende Beinachse hatten. Die bilateralen zeigten eine signifikant größere Beinlängendifferenz als die Norm, die unilateralen Patienten jedoch diesbezüglich keine Abweichung. Insgesamt zeigten die Patienten ein verändertes Gangbild, welches weitgehend den bereits in der Literatur beschriebenen Veränderungen entsprach.
Bezüglich der Gelenkmomente zeigte sich ein im Vergleich zur Norm erniedrigtes KAM 2, die übrigen Gelenkmomente zeigten keine Abweichungen von der Norm.
Es zeigten sich weder für die Beinachse noch für die Gelenkmomente signifikante Unterschiede zwischen unilateralem und bilateralem Patientenkollektiv.
Die unilateralen Patienten als gesamtes zeigten keine Korrelationen mit der absoluten Beinlängendifferenz. In einer unilateralen Subgruppe, in der die betroffene Seite länger war, konnte eine inverse Korrelation mit HAM 1 und HAM 2 gefunden werden.
KAM 1 und KAM 2 korrelierten signifikant mit allen Beinachsenparametern. In einer schrittweisen Regressionsanalyse mit HKA, FO und MFA konnten damit 68% der KAM 1 Alterationen und 57,5 % der Veränderungen von KAM 2 erklärt werden. HAM 1 und HAM 2 zeigten jeweils eine signifikante Korrelation mit MFA.
Schlussfolgerung: Die vorliegenden Ergebnisse zeigen, dass die Beinachse, insbesondere das Offset, einen Teil der Veränderungen der Kniegelenksbelastung erklären. Eine intraoperative Vergrößerung des Offsets und damit eine Varisierung der Beinachse könnte möglicherweise so zu einer Normalisierung der Kniegelenksbelastung führen.