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Institute
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Background: Dental professionals are subjected to higher risks for musculoskeletal disorders (MSDs) than other professional groups, especially the hand region. This study aims to investigate the prevalence of hand complaints among dentists (Ds) and dental assistants (DAs) and examines applied therapies. Methods: For this purpose, an online questionnaire analysed 389 Ds (240female/149male) and 406 DAs (401female/5male) working in Germany. The self-reported data of the two occupational groups were compared with regard to the topics examined. The questionnaire was based on the Nordic Questionnaire (self-reported lifetime, 12-month and 7-day MSDs prevalence of the hand, the conducted therapy and its success), additional occupational and sociodemographic questions as well as questions about specific medical conditions. Results: 30.8% of Ds affirmed MSDs in the hand at any time in their lives, 20.3% in the last twelve months and 9.5% in the last seven days. Among DAs, 42.6% reported a prevalence of MSDs in the hand at any time in their lives, 31.8% in the last 12 months and 15.3% in the last seven days. 37.5% of the Ds and 28.3% of the DAs stated that they had certain treatments. For both, Ds and DAs, physiotherapy was the most frequently chosen form of therapy. 89.7% of Ds and 63.3% of DAs who received therapy reported an improvement of MSDs. Conclusion: Although the prevalence of MSDs on the hand is higher among DAs than among Ds, the use of therapeutic options and the success of therapy is lower for DAs compared to Ds.
This study deals with 3D laser investigation on the border between the human lymph node T-zone and germinal centre. Only a few T-cells specific for antigen selected B-cells are allowed to enter germinal centres. This selection process is guided by sinus structures, chemokine gradients and inherent motility of the lymphoid cells. We measured gaps and wall-like structures manually, using IMARIS, a 3D image software for analysis and interpretation of microscopy datasets. In this paper, we describe alpha-actin positive and semipermeable walls and wall-like structures that may hinder T-cells and other cell types from entering germinal centres. Some clearly defined holes or gaps probably regulate lymphoid traffic between T- and B-cell areas. In lymphadenitis, the morphology of this border structure is clearly defined. However, in case of malignant lymphoma, the wall-like structure is disrupted. This has been demonstrated exemplarily in case of angioimmunoblastic T-cell lymphoma. We revealed significant differences of lengths of the wall-like structures in angioimmunoblastic T-cell lymphoma in comparison with wall-like structures in reactive tissue slices. The alterations of morphological structures lead to abnormal and less controlled T- and B-cell distributions probably preventing the immune defence against tumour cells and infectious agents by dysregulating immune homeostasis.
Background: The intraoperative blood loss is estimated daily in the operating room and is mainly done by visual techniques. Due to local standards, the surgical sponge colours can vary (e.g. white in US, green in Germany). The influence of sponge colour on accuracy of estimation has not been in the focus of research yet. Material and methods: A blood loss simulation study containing four “bleeding” scenarios each per sponge colour were created by using expired whole blood donation samples. The blood donations were applied to white and green surgical sponges after dilution with full electrolyte solution. Study participants had to estimate the absorbed blood loss in sponges in all scenarios. The difference to the reference blood loss was analysed. Multivariate linear regression analysis was performed to investigate other influence factors such as staff experience and sponge colour. Results: A total of 53 anaesthesists participated in the study. Visual estimation correlated moderately with reference blood loss in white (Spearman's rho: 0.521; p = 3.748*10−16) and green sponges (Spearman's rho: 0.452; p = 4.683*10−12). The median visually estimated blood loss was higher in white sponges (250ml IRQ 150–412.5ml) than in green sponges (150ml IQR 100-300ml), compared to reference blood loss (103ml IQR 86–162.8). For both colour types of sponges, major under- and overestimation was observed. The multivariate statistics demonstrates that fabric colours have a significant influence on estimation (p = 3.04*10−10), as well as clinician’s qualification level (p = 2.20*10−10, p = 1.54*10−08) and amount of RBL to be estimated (p < 2*10−16). Conclusion: The deviation of correct blood loss estimation was smaller with white surgical sponges compared to green sponges. In general, deviations were so severe for both types of sponges, that it appears to be advisable to refrain from visually estimating blood loss whenever possible and instead to use other techniques such as e.g. colorimetric estimation.
Objectives: In this study, localization accuracy and sensitivity to acoustic interaural time differences (ITDs) in subjects using cochlear implants with combined electric-acoustic stimulation (EAS) were assessed and compared with the results of a normal hearing control group. Methods: Eight CI users with EAS (2 bilaterally implanted, 6 unilaterally implanted) and symmetric binaural acoustic hearing and 24 normal hearing subjects participated in the study. The first experiment determined mean localization error (MLE) for different angles of sound incidence between ± 60° (frontal and dorsal presentation). The stimuli were either low-pass, high-pass or broadband noise bursts. In a second experiment, just noticeable differences (JND) of ITDs were measured for pure tones of 125 Hz, 250 Hz and 500 Hz (headphone presentation). Results: Experiment 1: MLE of EAS subjects was 8.5°, 14.3° and 14.7°, (low-, high-pass and broadband stimuli respectively). In the control group, MLE was 1.8° (broadband stimuli). In the differentiation between sound incidence from front and back, EAS subjects performed on chance level. Experiment 2: The JND-ITDs were 88.7 μs for 125 Hz, 48.8 μs for 250 Hz and 52.9 μs for 500 Hz (EAS subjects). Compared to the control group, JND-ITD for 125 Hz was on the same level of performance. No statistically significant correlation was found between MLE and JND-ITD in the EAS cohort. Conclusions: Near to normal ITD sensitivity in the lower frequency acoustic hearing was demonstrated in a cohort of EAS users. However, in an acoustic localization task, the majority of the subjects did not reached the level of accuracy of normal hearing. Presumably, signal processing time delay differences between devices used on both sides are deteriorating the transfer of precise binaural timing cues.
Background: Anemia is the most important complication during major surgery and transfusion of red blood cells is the mainstay to compensate for life threating blood loss. Therefore, accurate measurement of hemoglobin (Hb) concentration should be provided in real-time. Blood Gas Analysis (BGA) provides rapid point-of-care assessment using smaller sampling tubes compared to central laboratory (CL) services. Objective: This study aimed to investigate the accuracy of BGA hemoglobin testing as compared to CL services. Methods: Data of the ongoing LIBERAL-Trial (Liberal transfusion strategy to prevent mortality and anemia-associated ischemic events in elderly non-cardiac surgical patients, LIBERAL) was used to assess the bias for Hb level measured by BGA devices (ABL800 Flex analyzer®, GEM series® and RapidPoint 500®) and CL as the reference method. For that, we analyzed pairs of Hb level measured by CL and BGA within two hours. Furthermore, the impact of various confounding factors including age, gender, BMI, smoker status, transfusion of RBC, intraoperative hemodilution, and co-medication was elucidated. In order to ensure adequate statistical analysis, only data of participating centers providing more than 200 Hb pairs were used. Results: In total, three centers including 963 patients with 1,814 pairs of Hb measurements were analyzed. Mean bias was comparable between ABL800 Flex analyzer® and GEM series®: - 0.38 ± 0.15 g/dl whereas RapidPoint 500® showed a smaller bias (-0.09 g/dl) but greater median absolute deviation (± 0.45 g/dl). In order to avoid interference with different standard deviations caused by the different analytic devices, we focused on two centers using the same BGA technique (309 patients and 1,570 Hb pairs). A Bland-Altman analysis and LOWESS curve showed that bias decreased with smaller Hb values in absolute numbers but increased relatively. The smoker status showed the greatest reduction in bias (0.1 g/dl, p<0.001) whereas BMI (0.07 g/dl, p = 0.0178), RBC transfusion (0.06 g/dl, p<0.001), statins (0.04 g/dl, p<0.05) and beta blocker (0.03 g/dl, p = 0.02) showed a slight effect on bias. Intraoperative substitution of volume and other co-medications did not influence the bias significantly. Conclusion: Many interventions like substitution of fluids, coagulating factors or RBC units rely on the accuracy of laboratory measurement devices. Although BGA Hb testing showed a consistently stable difference to CL, our data confirm that BGA devices are associated with different bias. Therefore, we suggest that hospitals assess their individual bias before implementing BGA as valid and stable supplement to CL. However, based on the finding that bias decreased with smaller Hb values, which in turn are used for transfusion decision, we expect no unnecessary or delayed RBC transfusion, and no major impact on the LIBERAL trial performance.
Objectives: To review systematically the past 10 years of research activity into the healthcare experiences (HCX) of patients with chronic heart failure (CHF) in Germany, in order to identify research foci and gaps and make recommendations for future research. Design: In this scoping review, six databases and grey literature sources were systematically searched for articles reporting HCX of patients with CHF in Germany that were published between 2008 and 2018. Extracted results were summarised using quantitative and qualitative descriptive analysis. Results: Of the 18 studies (100%) that met the inclusion criteria, most were observational studies (60%) that evaluated findings quantitatively (60%). HCX were often concerned with patient information, global satisfaction as well as relationships and communication between patients and providers and generally covered ambulatory care, hospital care and rehabilitation services. Overall, the considerable heterogeneity of the included studies’ outcomes only permitted relatively trivial levels of synthesis. Conclusion: In Germany, research on HCX of patients with CHF is characterised by missing, inadequate and insufficient information. Future research would benefit from qualitative analyses, evidence syntheses, longitudinal analyses that investigate HCX throughout the disease trajectory, and better reporting of sociodemographic data. Furthermore, research should include studies that are based on digital data, reports of experiences gained in under-investigated yet patient-relevant healthcare settings and include more female subjects.
Hintergrund/Zielsetzung: Die Studentische Poliklinik Frankfurt (SP) ist die erste sogenannte Student-run Free Clinic in Deutschland. In ihr versorgen Studenten der Humanmedizin unter ärztlicher Aufsicht nicht-krankenversicherte Patienten. Vor der Tätigkeit in der SP müssen die Studenten ein intensives Vorbereitungsprogramm absolvieren. Dieses Programm ist seit Sommer 2013 als Wahlpflichtfach an der Medizinischen Fakultät der Goethe-Universität Frankfurt curricular verankert. Im Wintersemester 2016/2017 wurde zusätzlich zum bestehenden Peer-assisted Learning Kurs ein web-basierter Virtual Patient Learning Kurs eingeführt.
Ziel dieser Studie war es, die Wirksamkeit von Peer-assisted Learning mit Virtual Patient Learning im Erwerb allgemeinmedizinischer Grundkenntnisse und -fertigkeiten zu vergleichen. Betrachtet wurden hierbei unterschiedliche Ebenen des Kompetenzerwerbs: theoretisches Wissen, praktisches Wissen und Selbstevaluation standen im Fokus der Studie.
Methoden: 51 Studenten des fünften Fachsemesters wurden randomisiert in eine Peer-assisted Learning Gruppe (PAL Gruppe; n = 20), eine Virtual Patient Learning Gruppe (VPL Gruppe; n = 20) und eine Kontrollgruppe (KG, n = 11). Alle Gruppen absolvierten den curricularen Unterricht des ersten klinischen Semesters. Zusätzlich durchlief die PAL Gruppe das Wahlfach der SP im Peer-assisted Learning Format. Die VPL Gruppe durchlief das Wahlfach der SP im web-basierten Format mit sogenannten virtuellen Patienten auf der e-Learning Plattform Lernbar der Goethe Universität Frankfurt.
Die Messung des Wissenserwerbs beinhaltete einen theoretischen Vortest und Nachtest (Langzeit-Test) mit je 24 Single-Choice Fragen und theoretische Kurzzeit-Tests nach jedem der Kasuistikseminare mit je fünf Single-Choice Fragen. Der praktische Kompetenzerwerb wurde durch eine curriculare und eine zum Wahlfach gehörende Objective Structured Clinical Examination (OSCE) nach Abschluss der Intervention gemessen. Außerdem schätzten die Studienteilnehmer ihren Wissens- und Kompetenzerwerb vor und nach Teilnahme am Wahlfach der SP mit Hilfe eines Fragebogens ein. Hierfür beantworteten sie 34 Fragen anhand einer sechsstufigen Likert-Skala (1 = sehr sicher; 6 = überhaupt nicht sicher).
Nach jedem Kasuistikseminar evaluierten die Studenten die jeweilige Kasuistik mit je fünf Fragen anhand einer sechsstufigen Likert-Skala (1 = ich stimme voll zu; 6 = ich stimme überhaupt nicht zu).
Das Signifikanzniveau wurde auf 0.05 festgelegt.
Ergebnisse: Im gesamten theoretischen Nachtest erwarben alle Gruppen (PAL, VPL und KG) einen signifikanten Wissenszuwachs (PAL p < 0.0001; VPL p < 0.0001; KG p = 0.0156) verglichen mit dem theoretischen Vortest. In allen theoretischen Kurzzeit-Tests wies die VPL Gruppe ein signifikant besseres Ergebnis auf als die PAL Gruppe (Mittelwert PAL = 85.75 %; Mittelwert VPL = 90.57 %; p = 0.0047).
Im Wahlfach OSCE zeigte sich kein signifikanter Unterschied zwischen der PAL und VPL Gruppe (p = 0.5395). Im curricularen OSCE zeigte sich kein signifikanter Unterschied zwischen beiden Testgruppen und der KG (p = 0.4263).
In der Selbsteinschätzung nach Intervention schätzte sich die PAL Gruppe in 31 von 34 Items signifikant besser ein als zuvor. Die VPL Gruppe schätzte sich in 25 Items und die KG in 16 der 34 Items signifikant besser ein als zuvor.
Die Kasuistikseminare wurden von der PAL und VPL Gruppe ähnlich bewertet. Die Mediane für die einzelnen Kasuistiken lagen bei 1 oder 2.
Allgemeinmedizinische Grundkenntnisse und Fertigkeiten können mit VPL genauso effektiv vermittelt werden wie mit PAL. Aufgrund der Kosteneffizienz, einer hohen Reproduzierbarkeit und des frei wählbaren Umfangs bezüglich Bearbeitungsort-und Zeit, sollte VPL häufiger in der allgemeinmedizinischen Lehre im Rahmen von Student-run Free Clinics durchgeführt werden. Letztendlich kann dies zu einer verbesserten Behandlungsqualität und Patientenzufriedenheit führen.
Die VPL Seminare sollten dennoch weiterentwickelt werden und besonders im Hinblick auf Feedback an die Studenten moduliert und individualisierter gestaltet werden.
Aims: In primary central nervous system tumours, epithelial-to-mesenchymal transition (EMT) gene expression is associated with increased malignancy. However, it has also been shown that EMT factors in gliomas are almost exclusively expressed by glioma vessel-associated pericytes (GA-Peris). In this study, we aimed to identify the mechanism of EMT in GA-Peris and its impact on angiogenic processes.
Methods; In glioma patients, vascular density and the expression of the pericytic markers platelet derived growth factor receptor (PDGFR)-β and smooth muscle actin (αSMA) were examined in relation to the expression of the EMT transcription factor SLUG and were correlated with survival of patients with glioblastoma (GBM). Functional mechanisms of SLUG regulation and the effects on primary human brain vascular pericytes (HBVP) were studied in vitro by measuring proliferation, cell motility and growth characteristics.
Results: The number of PDGFR-β- and αSMA-positive pericytes did not change with increased malignancy nor showed an association with the survival of GBM patients. However, SLUG-expressing pericytes displayed considerable morphological changes in GBM-associated vessels, and TGF-β induced SLUG upregulation led to enhanced proliferation, motility and altered growth patterns in HBVP. Downregulation of SLUG or addition of a TGF-β antagonising antibody abolished these effects.
Conclusions: We provide evidence that in GA-Peris, elevated SLUG expression is mediated by TGF-β, a cytokine secreted by most glioma cells, indicating that the latter actively modulate neovascularisation not only by modulating endothelial cells, but also by influencing pericytes. This process might be responsible for the formation of an unstructured tumour vasculature as well as for the breakdown of the blood–brain barrier in GBM.
Functional roles of COMP and TSP-4 in articular cartilage and their relevance in osteoarthritis
(2020)
Osteoarthritis (OA) is a slowly progressing disease, resulting in the degradation of cartilage and the loss of joint functionality. The cartilage extracellular matrix (ECM) is degraded and undergoes remodelling in OA progression. Chondrocytes start to express degrading proteases but are also reactivated and synthesise ECM proteins. The spectrum of these newly synthesised proteins and their involvement in OA specific processes and cartilage repair is hardly investigated.
Human articular cartilage obtained from OA patients undergoing knee replacement surgery was evaluated according to the OARSI histopathology grading system. Healthy, non-OA cartilage samples were used as controls. The expression and distribution of thrombospondin-4 (TSP-4) and the closely related COMP were analysed on the gene level by PCR and on the protein level by immunohistology and immunoblot assays. The potential of TSP-4 as a diagnostic marker was evaluated by immunoblot assays, using serum samples from OA patients and healthy individuals. The functional role of both proteins was further investigated in in vitro studies using chondrocytes isolated from femoral condyles of healthy pigs. The effect of COMP and TSP-4 on chondrocyte migration and attachment was investigated via transwell and attachment assays, respectively. Moreover, the potential of COMP and TSP-4 to modulate the chondrocyte phenotype by inducing gene expression, ECM protein synthesis and matrix formation was investigated by immunofluorescence staining and qPCR. The activation of cartilage relevant signalling pathways was investigated by immunoblot assays.
These results showed for the first time the presence of TSP-4 in articular cartilage. Its amount dramatically increased in OA compared to healthy cartilage and correlated positively with OA severity. In healthy cartilage TSP-4 was primarily found in the superficial zone while it was wider distributed in the middle and deeper zones of OA cartilage. The amount of specific TSP-4 fragments was increased in sera of OA patients compared to healthy controls, indicating a potential to serve as an OA biomarker. COMP was ubiquitously expressed in healthy cartilage but degraded in early as well as re-expressed in late-stage OA. The overall protein levels between OA severity grades were comparable. Contrary to TSP-4, COMP was localised primarily in the upper zone of OA cartilage, in particular in areas with severe damage. COMP could attract chondrocytes and facilitated their attachment, while TSP-4 did not affect these processes. COMP and TSP 4 were generally weak inducers of gene expression, although both could induce COL2A1 and TSP-4 additionally COL12A1 and ACAN after 6 h. Correlating data were obtained on the protein level: COMP and TSP-4 promoted the synthesis and matrix formation of collagen II, collagen IX, collagen XII and proteoglycans. In parallel, both proteins suppressed chondrocyte hypertrophy and dedifferentiation by reducing collagen X and collagen I. By analysing the effect of COMP and TSP-4 on intracellular signalling, both proteins induced Erk1/2 phosphorylation and TSP-4 could further promote Smad2/3 signalling induced by TGF-β1. None of the two proteins had a direct or modulatory effect on Smad1/5/9 dependent signalling.
In summary, COMP and TSP-4 contribute to ECM maintenance and repair by inducing the expression of essential ECM proteins and suppressing chondrocyte dedifferentiation. These effects might be mediated by Erk1/2 phosphorylation. The presented data demonstrate an important functional role of COMP and TSP-4 in both healthy and OA cartilage and provide a basis for further studies on their potential in clinical applications for OA diagnosis and treatment.
Mesenchymale Knochenmarksstammzellen (engl. Bone Marrow-Derived Mesenchymal Stem Cells (BMSCs)) sind hochproliferative multipotente Progenitorzellen mit einem hohen Regenerationspotential. Sie können aus dem Knochenmark in geschädigte Knorpelareale migrieren und dort zu Chondrozyten differenzieren. Somit können sie zur Reparatur traumatisch oder osteoarthrotisch bedingter Knorpelschäden beitragen. In verschiedenen Bereichen des Gelenks konnten zudem sympathische Nervenfasern sowie der sympathische Neurotransmitter Noradrenalin (NE) nachgewiesen werden. NE inhibiert die chondrogene Differenzierungskapazität von BMSCs und kann so zur Pathogenese der Osteoarthrose (OA) beitragen. Unbekannt ist zum derzeitigen Zeitpunkt, inwiefern NE die Proliferation von humanen BMSCs beeinflusst. Ziel unserer Studie war, den Einfluss von NE auf die Proliferationskapazität humaner BMSCs zu untersuchen und beteiligte intrazelluläre Signalwege zu identifizieren.
Zu diesem Zweck wurden BMSCs von Patienten nach stattgehabtem Gelenktrauma (Trauma BMSCs) und von Patienten mit diagnostizierter OA (OA BMSCs) untersucht. Zunächst erfolgte eine Analyse des Genexpressionsmusters der verschiedenen Adrenorezeptoren (ARs). Anschließend wurden sowohl Trauma als auch OA BMSCs mit NE in unterschiedlichen Konzentrationen sowie mit NE in Kombination mit verschiedenen AR-Antagonisten (Doxazosin (α1), Yohimbin (α2) oder Propranolol (β2)) behandelt. Die Aktivierung der AR-gekoppelten Signalwege wurde anhand der Phosphorylierung der beiden Hauptsignalwege der extrazellulären signalregulierten Kinasen 1/2 (ERK1/2) und der Proteinkinase A (PKA) via Western Blot untersucht.
Die Genexpression diverser AR-Subtypen konnte in Trauma (α2B-, α2C- und β2-AR) und OA BMSCs (α2A-, α2B- und β2-AR) nachgewiesen werden. Die Behandlung mit NE in hohen Konzentrationen führte zu einer statistisch signifikanten Inhibition der Proliferation von Trauma und OA BMSCs. Die Behandlung mit NE in niedrigen Konzentrationen hatte hingegen keinen Einfluss auf die Proliferation von Trauma und OA BMSCs. Sowohl ERK1/2 als auch PKA wurden in Trauma und OA BMSCs nach Behandlung mit NE aktiviert. Lediglich der β2-Antagonist Propranolol konnte sowohl die Effekte auf die Proliferation als auch auf die Aktivierung von ERK1/2 und PKA aufheben. Doxazosin und Yohimbin hatten hingegen keinen signifikanten Einfluss auf die Proliferation sowie die ERK1/2- und PKA-Phosphorylierung.
Unsere Untersuchungen zeigen, dass NE die Proliferation von Trauma und OA BMSCs konzentrationsabhängig inhibiert. Dieser Effekt wird vornehmlich über eine β2-AR-gekoppelte ERK1/2- und PKA-Aktivierung vermittelt. Über diesen Mechanismus kann NE das regenerative Potential von humanen BMSCs verringern und somit zur Pathogenese der OA beitragen. Über eine zielgerichtete Beeinflussung des β2-Signalweges könnten sich zukünftig neue therapeutische Optionen bei der Behandlung osteoarthrotisch oder traumatisch bedingter Knorpelschäden ergeben.
Ein professioneller Orchestermusiker verbringt die meiste Zeit in körperlich ungünstiger Sitzhaltung beim Spielen. Die Folge ist ein Anstieg des Risikos für die Entwicklung von muskuloskelettalen Beschwerden [44, 127, 128]. Eine Verbesserung der Arbeitsbedingungen lässt sich u.a. durch den Einsatz von ergonomischen Stühlen erzielen, da sie einen Einfluss auf die Körperhaltung des Orchestermusikers besitzen. Im Mittelpunkt der vorliegenden Arbeit standen daher sechs unterschiedliche von der Firma Mey für Orchestermusiker konzipierte Stühle. Die Studie beinhaltete eine Untersuchung des Einflusses der Stühle auf die Oberkörperstatik und die Sitzdruckverteilung von Orchestermusikern und den Einfluss auf ihr Instrumentalspiel im Vergleich zur habituellen Sitzhaltung. Das Probandenkollektiv umfasste 24 Berufsmusiker des Polizeiorchesters Mainz (Rheinland-Pfalz, Deutschland) und bestand zum größten Teil aus Blasinstrumentalisten (3 Frauen, 21 Männer). Das Durchschnittsalter betrug 45 Jahre. Die Überprüfung der Oberkörperstatik erfolgte durch einen 3D-Rückenscanner (ABW GmbH, Frickenhausen, Deutschland), eine Evaluation der Druckverhältnisse im Gesäß durch eine Druckmessmatte (GeBioM GmbH, Münster, Deutschland), womit sich bei jedem Stuhl ein bestimmtes Druckmuster kennzeichnen ließ. Die Messung erfolgte pro Stuhl und Messgerät stets im Wechsel zwischen der statischen Position ohne Instrument (oI) und der statischen Position mit Instrument (mI). Bei der statistischen Auswertung kam es zur Verwendung nicht parametrischer Tests (Friedman-, Wilcoxon Matched- Pairs-Test), wobei das Signifikanzniveau bei ≤0,05 lag. Es erfolgte eine Unterteilung in einen Inter- und einen Intrastuhlvergleich.
Die Ergebnisse des Interstuhlvergleichs zeigten bezüglich der Schulterregion keine signifikanten Veränderungen, wohingegen im Hinblick auf die WS-Parameter Signifikanzen zwischen Stuhl 2 und 5 verzeichnet wurden: in der habituellen Position offenbarte die Rumpflänge D die größte Abweichung mit einem Längenunterschied von 14mm (p≤0,001), so auch die Rumpflänge S (16 mm; p≤0,001). Bezüglich dieser Stühle wiesen die restlichen WS-Parameter Abweichungen von max. 4° bzw. 3mm auf. Zwischen Stuhl 2 und 3 ergaben sich m.I. im Hinblick auf den thorakalen (p≤0,01) und lumbalen Biegungswinkel (p≤0,001) max. Diskrepanzen von 2,5°. Die größten Unterschiede in der Beckenregion zeigten sich beim Beckenabstand zwischen Stuhl 3 und 5 o.I. (7mm) und m.I. (4mm), (beide Bedingungen p≤0,001). Im Hinblick auf die Druckparameter fand sich eine Abhängigkeit zwischen belasteter Fläche und Sitzbeinhöckerdruck (SBH): eine kleine Fläche bedeutete eine schlechte Druckverteilung und umgekehrt. Stühle 1 und 4 besaßen den geringsten SBH (p≤0,001). Im Intrastuhlvergleich zeigten die Bereiche der WS, Schultern und Becken jeweils mindestens einen signifikanten Parameter auf, wie z.B. Schulterblattabstand, sagittale Rumpfneigung und Beckenabstand. Korrelationen zwischen den Parametern waren nicht zu erkennen. M.I. kommt es hinsichtlich des SBH auf der linken Hälfte im Schnitt auf allen Stühlen zu einer Druckerhöhung von 8,46%, auf der rechten zu einer von 11,11%. Im Hinblick auf den Oberschenkeldruck (OS) vollzieht sich die größte Veränderung (7,4bar) der rechten Gesäßhälfte auf Stuhl 2 mit p≤0,001. Der Interstuhlvergleich zeigt also, dass die Wahl eines Stuhls keine Auswirkung auf die Körperhaltung hat. Ursache für Diskrepanzen hinsichtlich des SBH ist die unterschiedliche Polsterung und Größe der Sitzfläche, welche eine hohe Relevanz in Bezug auf die Umverteilung des Drucks und den subjektiven Komfort besitzt. Eine gepolsterte und große Oberfläche ist gleichzusetzen mit einer günstigen Druckverteilung und einem angenehmen individuellen Sitzgefühl. Der Intrastuhlvergleich offenbart ebenfalls keine klinisch relevanten Veränderungen im Oberkörper. Ausschließlich in der Druckverteilung ist eine signifikante Variabilität hinsichtlich des OS rechts bei Stuhl 2 vorhanden (p≤0,001). Die Sitzposition der Probanden ist symmetrisch. Die Symmetrie bezieht sich sowohl auf den Schulter-, WS- und Beckenbereich, als auch auf die Druckverhältnisse im Gesäßbereich.
In der vorliegenden Studie konnte belegt werden, dass gepolsterte und breite Sitzoberflächen mit gleichmäßiger Druckverteilung und gleichzeitig hohem Komfort einhergehen. Im Hinblick auf das Musizieren über einen längeren Zeitraum ist das Vorhandensein eines hohen Komforts für den Orchestermusiker von Bedeutung. Diese Erkenntnisse sind bei der Weiterentwicklung von ergonomischen Stühlen zu berücksichtigen. Eine Analyse der Schulter- und Rumpfmuskulatur und Messung des Beckenwinkels ist in weiteren Studien zusätzlich erforderlich, um zu erforschen, inwieweit die Stühle die Fehlfunktionen des Bewegungsapparates beeinflussen.
Die Therapie langstreckiger Knochendefekte stellt auch weiterhin eine große Herausforderung dar. Dies beruht unter anderem darauf, dass der therapeutische Goldstandard - die Verwendung von autogener Knochensubstanz aus dem Beckenkamm - neben der begrenzten Verfügbarkeit vor allem Komplikationen im Bereich der Entnahmestelle mit sich bringen kann. Es wurde bisher aber noch kein durchschlagendes Ergebnis in der Entwicklung neuer Scaffolds zum Einsatz bei langstreckigen Knochendefekten erreicht. Dies kann eine Vielzahl an Ursachen haben, die sich von der verwendeten Ausgangssubstanz, bis hin zum verwendeten Design erstrecken können. Neben dem Ausgangsmaterial spielen vor
allem die Formgebung und physikalische Eigenschaften, wie Porosität und Mikroarchitektur, eine wichtige Rolle.
Ein aktueller Ansatz zur Nutzung als alternatives Knochenersatzmaterial ist das Knochen-Tissue-Engineering. Hierbei werden körpereigene, knochen-regenerative Zellen mit einem dreidimensionalen Gerüststoff (Knochenersatzmaterial oder -scaffold) kombiniert und in den Knochendefekt implantiert. In dieser Arbeit wurde der Fokus auf die Designentwicklung eines neuen Kochenersatz-Scaffolds gelegt. Nach Vorbild schon vorgestellter Knochenersatzdesigns und unter Berücksichtigung einer Grundstruktur, die auch Phasen der Knochenheilung wie die Frakturhämatomausbreitung und initiale Nährstoffversorgung einbeziehen sollte, wurden mehrere Designs (Raster, Tempel, Zwiebel) entwickelt. Mithilfe des additiv extrusionsbasierten Schmelzschichtverfahrens (Fused Filament Fabrication) wurden die in Computer-Aided Design entworfenen Scaffolds realisiert.
Dieser Ansatz beinhaltet, unter Verwendung des resorbierbaren und biokompatiblen Trägerpolymers Polylaktat, mehrstufige Designs, die kleine biologisch funktionelle Einheiten in eine tragende, kompressionsfeste Rahmenstruktur einbetten. Hierdurch entsteht einerseits die nötige mechanische Belastbarkeit und andererseits eine offene Architektur mit Poren, die Diffusion von Sauerstoff und
Nährstoffen in die inneren Bereiche des Implantats ermöglicht. Es wurden verschiedene Designs entwickelt, gedruckt und mechanisch sowie in vitro in den Kernbereichen Zelladhäsion, Zellaktivität und osteogene Differenzierung nach Besiedelung mit Saos-2-Zellen charakterisiert.
Ein weiterer Entwicklungsschritt stellte das Einführen eines neuartigen, innerhalb der Designs kompatiblen Baukastensystems dar. Hierdurch wird nicht nur die Anpassbarkeit an den Knochendefekt verbessert, es sind auch weitere Funktionen ergänzbar und die unterschiedlichen Designs untereinander kombinierbar.
Die Ergebnisse dieser Dissertationsarbeit dienen als Basis für einen völlig neuen Ansatz von Knochenersatzmaterialien mit positiven biologischen sowie biophysikalischen Eigenschaften.
The intestinal epithelium acts as a selective barrier for the absorption of water, nutrients and orally administered drugs. To evaluate the gastrointestinal permeability of a candidate molecule, scientists and drug developers have a multitude of cell culture models at their disposal. Static transwell cultures constitute the most extensively characterized intestinal in vitro system and can accurately categorize molecules into low, intermediate and high permeability compounds. However, they lack key aspects of intestinal physiology, including the cellular complexity of the intestinal epithelium, flow, mechanical strain, or interactions with intestinal mucus and microbes. To emulate these features, a variety of different culture paradigms, including microfluidic chips, organoids and intestinal slice cultures have been developed. Here, we provide an updated overview of intestinal in vitro cell culture systems and critically review their suitability for drug absorption studies. The available data show that these advanced culture models offer impressive possibilities for emulating intestinal complexity. However, there is a paucity of systematic absorption studies and benchmarking data and it remains unclear whether the increase in model complexity and costs translates into improved drug permeability predictions. In the absence of such data, conventional static transwell cultures remain the current gold-standard paradigm for drug absorption studies.
Verletzungen der Fingerkuppen stellen einen häufigen Grund für die Vorstellung in der Notaufnahme dar. Während viele Verletzungen konservativ behandelt werden können, benötigen einige Patienten eine operative Versorgung. Dabei kommen verschiedene operative Verfahren zur Anwendung, darunter eine Fingerkuppenrekonstruktion mit einer neurovaskulären Insel-Lappenplastik.
Ziel der neurovaskulären Insel-Lappenplastik ist die Wiederherstellung einer taktil sensiblen und wieder belastungsfähigen Fingerkuppe ohne ein Längendefizit des Fingers.
In der vorliegenden Studie wurden Langzeit-Behandlungsergebnisse mit einer mittleren Nachuntersuchungsdauer von 105 Monaten bei 28 Patienten mit 29 durch neurovaskuläre Insel-Lappenplastiken rekonstruierten Fingerkuppen in der Berufsgenossenschaftlichen Unfallklinik Frankfurt am Main erfasst. Die untersuchten Patienten hatten zum Zeitpunkt der Verletzung ein Durchschnittsalter von 38,4 Jahren. Es handelte sich überwiegend um männliche und berufstätige Patienten.
Es wurden nur Fingerkuppenverletzungen mit freiliegenden Knochen (Allen-Klassifikation Zone III und IV) operativ versorgt. In unserer Studie traten am häufigsten die Verletzungen am Mittelfinger, Zeigefinger und Ringfinger auf. Die Mehrheit der Fingerkuppenverletzungen geschah in Folge eines Arbeitsunfalls, die Arbeitsunfähigkeitsdauer betrug ca. 6,1 Wochen. Die maximale Größe eines neurovaskulären Insel-Lappen lag bei 6 x 3,5 cm.
Alle Patienten waren mit den Behandlungsergebnissen anhand der numerischen Rating-Skala und des DASH Fragebogens bezüglich Funktionalität sowie dem ästhetischen Outcome zufrieden und würden sich wieder operieren lassen.
Die Sensibilität konnte anhand der Zwei-Punkte-Diskrimination sowie Semmes-Weinstein Monofilament-Testes als gut bewertet werden und normale physiologische Werte erreichen. Die Narbe war überwiegend weich und in der Mehrheit der Fälle entsprach sie anhand der Vancouver Scar Scale Werte annähend der normalen Haut. Zwei Drittel der Patienten gaben keine Schmerzen in Ruhe an. Die Hälfte der Patienten gaben Schmerzen unter Belastung anhand der numerischen Rating-Scala an.
Trotz der hohen Anzahl von Krallennagelbildungen in 56,5 % und einer Differenz der Nagellänge bzw. Form waren alle Patienten mit dem Erhalt des Nagels zufrieden und haben dies subjektiv nicht als störend empfunden.
Als besonders beeinträchtigend wurde eine Kälteempfindlichkeit von 48,3 % Patienten beschrieben.
Der Mittelwert der Fingerkraft im Schlüsselgriff mit Hilfe des Pinch-Gauge zwischen Daumen und den vier Fingerspitzen im Wechsel wurde bei fast allen Messungen an den gesunden Fingern gering größer gemessen ohne eine statistisch signifikante Differenz. Die Messung der Handkraft mittels Jamar-Dynamometer ergab ein Defizit von 8,8 % (Vergleich betroffene zur gesunden Hand).
Bei drei von 24 Patienten hat sich eine Beugekontraktur im Interphalangealgelenk von 5°, 15°, 20° und bei einem von 22 Patienten im distalen Interphalangealgelenk von 10° gebildet. Zum Nachuntersuchungszeitpunkt wurden durch die Untersucherin ein Hoffmann-Tinel- Zeichen in 24,1 % und Druckschmerz in 17,2 % im Bereich der verletzten Fingerkuppe festgestellt. Subjektiv empfand kein Patient diese Symptome als störend und alle berufstätigen Patienten konnten ihre vor dem Unfall ausgeübte Tätigkeit wieder aufnehmen. Diese Studie konnte belegen, dass die Defektdeckung der Fingerkuppenverletzungen mit Hilfe von neurovaskulären Insel-Lappenplastiken ein sehr gutes ästhetisches und funktionelles Ergebnis mit einer fast identischen Hautqualität erzielt. Mit dieser Methode konnte eine Wiederherstellung des Weichteilgewebes der sensiblen Fingerkuppe auch bei großflächigen Defekten der Fingerkuppe erreicht werden. Die subjektive Patientenzufriedenheit mit dieser Rekonstruktionsmethode ist hoch.
Background: Dentists are at a higher risk of suffering from musculoskeletal disorders (MSD) than the general population. However, the latest study investigating MSD in the dental profession in Germany was published about 20 years ago. Therefore, the aim of this study was to reveal the current prevalence of MSD in dentists and dental students in Germany. Methods: The final study size contained 450 (287 f/163 m) subjects of different areas of specialization. The age of the participants ranged from 23 to 75 years. The questionnaire consisted of a modified version of the Nordic Questionnaire, work-related questions from the latest questionnaire of German dentists, typical medical conditions and self-developed questions. Results: The overall prevalence showed that dentists suffered frequently from MSD (seven days: 65.6%, twelve months: 92%, lifetime: 95.8%). The most affected body regions included the neck (42.7%–70.9%–78.4%), shoulders (29.8%–55.6%–66.2%) and lower back (22.9%–45.8%–58.7%). Overall, female participants stated that they suffered from pain significantly more frequently, especially in the neck, shoulders and upper back. Conclusion: The prevalence of MSD among dentists, especially in the neck, shoulder and back area, was significantly higher than in the general population. In addition, women suffered more frequently from MSD than men in almost all body regions.
Large spines are stable and important for memory trace formation. The majority of large spines also contains synaptopodin (SP), an actin-modulating and plasticity-related protein. Since SP stabilizes F-actin, we speculated that the presence of SP within large spines could explain their long lifetime. Indeed, using 2-photon time-lapse imaging of SP-transgenic granule cells in mouse organotypic tissue cultures we found that spines containing SP survived considerably longer than spines of equal size without SP. Of note, SP-positive (SP+) spines that underwent pruning first lost SP before disappearing. Whereas the survival time courses of SP+ spines followed conditional two-stage decay functions, SP-negative (SP-) spines and all spines of SP-deficient animals showed single-phase exponential decays. This was also the case following afferent denervation. These results implicate SP as a major regulator of long-term spine stability: SP clusters stabilize spines, and the presence of SP indicates spines of high stability.
Prostate cancer patients whose tumors develop resistance to conventional treatment often turn to natural, plant-derived products, one of which is sulforaphane (SFN). This study was designed to determine whether anti-tumor properties of SFN, identified in other tumor entities, are also evident in cultivated DU145 and PC3 prostate cancer cells. The cells were incubated with SFN (1–20 µM) and tumor cell growth and proliferative activity were evaluated. Having found a considerable anti-growth, anti-proliferative, and anti-clonogenic influence of SFN on both prostate cancer cell lines, further investigation into possible mechanisms of action were performed by evaluating the cell cycle phases and cell-cycle-regulating proteins. SFN induced a cell cycle arrest at the S- and G2/M-phase in both DU145 and PC3 cells. Elevation of histone H3 and H4 acetylation was also evident in both cell lines following SFN exposure. However, alterations occurring in the Cdk-cyclin axis, modification of the p19 and p27 proteins and changes in CD44v4, v5, and v7 expression because of SFN exposure differed in the two cell lines. SFN, therefore, does exert anti-tumor properties on these two prostate cancer cell lines by histone acetylation and altering the intracellular signaling cascade, but not through the same molecular mechanisms.
Human placentation is a highly invasive process. Deficiency in the invasiveness of trophoblasts is associated with a spectrum of gestational diseases, such as preeclampsia (PE). The oncogene B-cell lymphoma 6 (BCL6) is involved in the migration and invasion of various malignant cells. Intriguingly, its expression is deregulated in preeclamptic placentas. We have reported that BCL6 is required for the proliferation, survival, fusion, and syncytialization of trophoblasts. In the present work, we show that the inhibition of BCL6, either by its gene silencing or by using specific small molecule inhibitors, impairs the migration and invasion of trophoblastic cells, by reducing cell adhesion and compromising the dynamics of the actin cytoskeleton. Moreover, the suppression of BCL6 weakens the signals of the phosphorylated focal adhesion kinase, Akt/protein kinase B, and extracellular regulated kinase 1/2, accompanied by more stationary, but less migratory, cells. Interestingly, transcriptomic analyses reveal that a small interfering RNA-induced reduction of BCL6 decreases the levels of numerous genes, such as p21 activated kinase 1, myosin light chain kinase, and gamma actin related to cell adhesion, actin dynamics, and cell migration. These data suggest BCL6 as a crucial player in the migration and invasion of trophoblasts in the early stages of placental development through the regulation of various genes associated with the migratory machinery.
The formation of oligomers of the amyloid-β peptide plays a key role in the onset of Alzheimer's disease. We describe herein the investigation of disease-relevant small amyloid-β oligomers by mass spectrometry and ion mobility spectrometry, revealing functionally relevant structural attributes. In particular, we can show that amyloid-β oligomers develop in two distinct arrangements leading to either neurotoxic oligomers and fibrils or non-toxic amorphous aggregates. Comprehending the key-attributes responsible for those pathways on a molecular level is a pre-requisite to specifically target the peptide's tertiary structure with the aim to promote the emergence of non-toxic aggregates. Here, we show for two fibril inhibiting ligands, an ionic molecular tweezer and a hydrophobic peptide that despite their different interaction mechanisms, the suppression of the fibril pathway can be deduced from the disappearance of the corresponding structure of the first amyloid-β oligomers.
Background: MitraClip ® (MC) is an established procedure for severe mitral regurgitation (MR) in patients deemed unsuitable for surgery. Right ventricular dysfunction (RVD) is associated with a higher mortality risk. The prognostic accuracy of heart failure risk scores like the Seattle heart failure model (SHFM) and Meta-Analysis Global Group in Chronic Heart Failure (MAGGIC) score in pts undergoing MC with or without RVD has not been investigated so far. Methods: SHFM and MAGGIC score were calculated retrospectively. RVD was determined as tricuspid annular plane systolic excursion (TAPSE) ≤15 mm. Area under receiver operating curves (AUROC) of SHFM and MAGGIC were performed for one-year all-cause mortality after MC. Results: N = 103 pts with MR III° (73 ± 11 years, LVEF 37 ± 17%) underwent MC with a reduction of at least I° MR. One-year mortality was 28.2%. In Kaplan-Meier analysis, one- year mortality was significantly higher in RVD-pts (34.8% vs 2.8%, p = 0.009). Area under the Receiver Operating Characteristic (AUROC) for SHFM and MAGGIC were comparable for both scores (SHFM: 0.704, MAGGIC: 0.692). In pts without RVD, SHFM displayed a higher AUROC and therefore better diagnostic accuracy (SHFM: 0.776; MAGGIC: 0.551, p < 0.05). In pts with RVD, MAGGIC and SHFM displayed comparable AUROCs. Conclusion: RVD is an important prognostic marker in pts undergoing MC. SHFM and MAGGIC displayed adequate over-all prognostic power in these pts. Accuracy differed in pts with and without RVD, indicating higher predictive power of the SHFM score in pts without RVD.