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Das System Thioredoxin /Thioredoxin Reduktase(Trx/TrxR) ist ein sehr versatiles System zur neutralisation reaktiver Sauerstoffspezies, zur Regulation redox-sensitiver Vorgänge und zur Aktivierung von Transkriptionsfaktoren wie Steroidhormonrezeptoren, AP-1 und NFkB. Das Enzym Thioredoxin Reduktase war zunächst nur als zytosolisches Enzym beschrieben, es ist mittlerweile bekannt, dass es z. B. nach Phorbolester-Stimulation auch sezeniert werden kann. Adäquate Stimuli für die nucläere Translokation von Trx sind z. B. UV-Licht und TNF-Signalling. Zudem wurde in der vorhandenen Arbeit anhand transienter Transfektion und immunhistochemischer Untersuchungen nachgewiesen, dass beide Komponenten des Systems auch im Zellkern präsent sind. Ein Teil er Arbeit stellt die Charakteriesierung der subzellulären Lokalisation zweier Isoformen von Thioredoxin Reduktase 1 mit unterschiedlichem N-Terminus dar. Es konnte gezeigt werden, dass die beiden Isoformen als mRNA und Protein vorhanden sind. Es wurde dann die Interaktion des Enzyms Thioredoxin Reduktase mit anderen Komponenten des Zellkerns, hier speziell mit Enzymen der DNA-Prozessierung untersucht. Zudem wurde in einem Immunpräzipitationsansatz ("Pull-Down-Assay") nucläere Interaktionspartner des Enzyms charakterisiert. Diese Partner sollen nach Gelelektrophorese und MALDI-TOF-Analyse identifiziert werden. Zu den DNA-Prozessierungsenzyme zählt auch Topisomerase I. Durch Antikörpervermittelte Assays gelang es nachzuweisen, dass Topoisomerase I mit TrxR eine Protein-Protein-Wechsekwirkung eingeht. In einem Rekonstruktionssystem mit rekombinanter Topoisomerase I und gerenigter TrxR ergab sich jedoch keiner Hinweis für eine funktionelle Interaktion in DNA-Relaxations-Assay. Die Aufschlüsselung der Protein-Protein-Interaktion, der detaillierten molekularen Mechanismen und ihrer physiologischen relevanz bleibt weiteren Unterschungen vorbehalten.
Vitamin D deficiency is a global health concern that is estimated to afflict over one billion people globally. The major role of vitamin D is that of a regulator of calcium and phosphate metabolism, thus, being essential for proper bone mineralisation. Concomitantly, vitamin D is known to exert numerous extra-skeletal actions. For example, it has become evident that vitamin D has direct anti-proliferative, pro-differentiation and pro-apoptotic actions on cancer cells. Hence, vitamin D deficiency has been associated with increased cancer risk and worse prognosis in several malignancies. We have recently demonstrated that vitamin D deficiency promotes secondary cancer growth in bone. These findings were partly attributable to an increase in bone remodelling but also through direct effects of vitamin D on cancer cells. To date, very little is known about vitamin D status of patients with bone tumours in general. Thus, the objective of this study was to assess vitamin D status of patients with diverse bone tumours. Moreover, the aim was to elucidate whether or not there is an association between pre-diagnostic vitamin D status and tumour malignancy in patients with bone tumours.
In a multi-center analysis, 25(OH)D, PTH and calcium levels of 225 patients that presented with various bone tumours between 2017 and 2018 were assessed. Collectively, 76% of all patients had insufficient vitamin D levels with a total mean 25(OH)D level of 21.43 ng/ml (53.58 nmol/L). In particular, 52% (117/225) of patients were identified as vitamin D deficient and further 24% of patients (55/225) were vitamin D insufficient. Notably, patients diagnosed with malignant bone tumours had significantly lower 25(OH)D levels than patients diagnosed with benign bone tumours [19.3 vs. 22.75 ng/ml (48.25 vs. 56.86 nmol/L); p = 0.04).
In conclusion, we found a widespread and distressing rate of vitamin D deficiency and insufficiency in patients with bone tumours. However, especially for patients with bone tumours sufficient vitamin D levels seem to be of great importance. Thus, we believe that 25(OH)D status should routinely be monitored in these patients. Collectively, there should be an increased awareness for physicians to assess and if necessary correct vitamin D status of patients with bone tumours in general or of those at great risk of developing bone tumours.
48 Patienten mit Rotatorenmanschettenrupturen (39-mal SSP, 3-mal SSP+ISP, 2-mal SSP+SSC, 4-mal SSP+ISP+SSC) wurden präoperativ sowie postoperativ nach sechs und sieben Wochen klinisch und sonographisch untersucht. Die klinische Untersuchung umfasste die Bestimmung des Constant-Scores sowie die Bewertung der dynamischen Schulterblattbewegung. Die sonographische Untersuchung erfolgte nach der von Müller et al. (1998) beschriebenen Methode, die eine standardisierte Dickenmessung der Mm. SSP und ISP, die Beurteilung ihrer Echogenitäten und Abgrenzbarkeiten sowie die Bewertung ihrer Kinetik bei definierten Bewegungen der Arme beinhaltete. Präoperativ lagen bei 40 Patienten pathologische Schulterblattbewegungsmuster vor. Mit Beginn der aktiven Rehabilitation kam es bei der Armbewegung in Abduktionsrichtung zu einer im Mittel signifikanten Besserung. Die Echogenität von M. SSP und M. ISP war bei intakter Sehne normal, bei Defekten präoperativ oft verändert und zeigte postoperativ eine weitere Verschlechterung. Der M. SSP war bei den Männern prä-, postoperativ und unabhängig davon, ob seine Sehne gerissen war, signifikant dicker als bei den Frauen. Für den M. ISP galt dies nur bei intakter Sehne. Die postoperative Ruhigstellung führte zu einer signifikanten Atrophie des M. ISP mit intakter Sehne. Die Mm. SSP und ISP mit Sehnenruptur waren schon präoperativ signifikant schmäler als die der gesunden Gegenseite und veränderten sich im postoperativen Verlauf nicht mehr. Die postoperative Ruhigstellung führte zu einer signifikanten Verschlechterung der ursprünglich normalen Muskelkinetik des M. ISP ohne Sehnenruptur. Bei den Mm. SSP und ISP mit Sehnenruptur war die Kinetik schon präoperativ signifikant schlechter als auf der Gegenseite und verschlechterte sich im postoperativen Verlauf noch weiter. Muskeln mit postoperativ rerupturierten Sehnen zeigten eine schlechterte Muskelkinetik als jene mit erfolgreich operierten Sehnen. Sowohl prä- als auch postoperativ korrelierten Echogenität, Abgrenzbarkeit und Muskelkinetik sehr gut mit der Defektgröße und dem postoperativen Constant-Score. Hingegen war die Korrelation der dynamischen Schulterblattbewegung mit Defektgröße und Constant-Score nur sehr schwach. Die verwendete Methode der Bestimmung der dynamischen Schulterblattbewegung ist zur Verlaufsbeobachtung einer operierten Rotatorenmanschette, zur Prognose über die tatsächliche Defektgröße und das funktionelle Ergebnis nach sieben Wochen nur begrenzt geeignet. Die sonographische Methode hingegen eignet sich als zusätzliches diagnostisches Kriterium bei Defekten der Rotatorenmanschette, hilft bei der Abschätzung der Defektgröße, ermöglicht eine prognostische Aussage über die postoperativ zu erwartende Funktion und bietet die Möglichkeit der objektiven Befundkontrolle während der Rehabilitation.
Es sollte eine dynamische MRT Methode entwickelt werden, welche die Berechnung und Darstellung einer Achse einer komplexen Bewegung ermöglicht. Dabei war die eigens auferlegte Definition von „Dynamik“, dass ein kompletter Bewegungsablauf als dreidimensionaler Datensatz im Zeitverlauf erfasst und ausgewertet werden soll (4 Dimensionen).
Diese Methode sollte auf die komplexe Bewegung des Kniegelenks angewendet werden und mit einem Knie-Modell verglichen werden.
Schlussendlich sollte die Flexion-Extensionsbewegung als vereinfacht monoaxial verifiziert werden.
Für diese Ziele wurden folgende Schritte durchgeführt:
Es wurden zunächst 10 Kadaver-Knie präpariert und hierbei u.a. kontrastmittelhaltige Kugeln als Tracker eingebracht. Die Knie wurden dann im Rahmen des Versuchsaufbaus in einer speziellen, pneumatischen Bewegungsschiene befestigt, welche dann automatisiert eine passive Bewegung vollzog. Diese wurde mit einer dynamischen MRT Methode festgehalten. Der entstandene 4D-Datensatz wurde eingelesen und die Kugelpositionen ausgewertet. Die Koordinaten der Positionen dienten dann als Grundlage für spezielle mathematische Algorithmen, welche die Flexion-Extensionsachse und ggf. die Innen- und Außenrotationsachse berechneten und schließlich eine graphische Darstellung ermöglichten. Zur Überprüfung wurde zudem ein Knie-Modell herangezogen und von diesem die gleichen Berechnungen durchgeführt.
Background: To describe changes in health-related quality of life (HRQoL) of postmenopausal women with osteoporosis treated with teriparatide for up to 18 months and followed-up for a further 18 months, and to assess the influence of recent prior and incident fractures.
Methods: The European Forsteo Observational Study (EFOS) is an observational, prospective, multinational study measuring HRQoL using the EQ-5D. The primary objective was to assess changes in HRQoL during 36 months in the whole study population. A secondary post-hoc analysis examined fracture impact on HRQoL in four subgroups classified based on recent prior fracture 12 months before baseline and incident clinical fractures during the study. Changes from baseline were analysed using a repeated measures model.
Results: Of the 1581 patients, 48.4% had a recent prior fracture and 15.6% of these patients had an incident fracture during follow-up. 10.9% of the 816 patients with no recent prior fracture had an incident fracture. Baseline mean EQ-VAS scores were similar across the subgroups. In the total study cohort (n = 1581), HRQoL (EQ-VAS and EQ-5D index scores) improved significantly from baseline to 18 months and this improvement was maintained over the 18-month post-teriparatide period. Improvements were seen across all five EQ-5D domains during teriparatide treatment that were maintained after teriparatide was discontinued. Subjects with incident clinical fractures had significantly less improvement in EQ-VAS than those without incident fractures. Recent prior fracture did not influence the change in EQ-VAS during treatment.
Conclusions: EFOS is the first longitudinal study in women with severe postmenopausal osteoporosis in the real world setting to show a substantial improvement in HRQoL during teriparatide treatment that was sustained during subsequent treatment with other medications. The increase in HRQoL was lower in the subgroups with incident fracture but was not influenced by recent prior fracture. The results should be interpreted in the context of the design of an observational study.
This predefined analysis of the European Forsteo Observational Study (EFOS) aimed to describe clinical fracture incidence, back pain, and health-related quality of life (HRQoL) during 18 months of teriparatide treatment and 18 months post-teriparatide in the subgroup of 589 postmenopausal women with osteoporosis aged ≥75 years. Data on clinical fractures, back pain (visual analogue scale, VAS), and HRQoL (EQ-5D) were collected over 36 months. Fracture data were summarized in 6-month intervals and analyzed using logistic regression with repeated measures. A repeated-measures model analyzed changes from baseline in back pain VAS and EQ-VAS. During the 36-month observation period, 87 (14.8 %) women aged ≥75 years sustained a total of 111 new fractures: 37 (33.3 %) vertebral fractures and 74 (66.7 %) nonvertebral fractures. Adjusted odds of fracture was decreased by 80 % in the 30 to <36–month interval compared with the first 6-month interval (P < 0.009). Although the older subgroup had higher back pain scores and poorer HRQoL at baseline than the younger subgroup, both age groups showed significant reductions in back pain and improvements in HRQoL postbaseline. In conclusion, women aged ≥75 years with severe postmenopausal osteoporosis treated with teriparatide in normal clinical practice showed a reduced clinical fracture incidence by 30 months compared with baseline. An improvement in HRQoL and, possibly, an early and significant reduction in back pain were also observed, which lasted for at least 18 months after teriparatide discontinuation when patients were taking other osteoporosis medication. The results should be interpreted in the context of an uncontrolled observational study.
In the adult skeleton, bone remodeling is required to replace damaged bone and functionally adapt bone mass and structure according to the mechanical requirements. It is regulated by multiple endocrine and paracrine factors, including hormones and growth factors, which interact in a coordinated manner. Because the response of bone to mechanical signals is dependent on functional estrogen receptor (ER) and Wnt/β-catenin signaling and is impaired in postmenopausal osteoporosis by estrogen deficiency, it is of paramount importance to elucidate the underlying mechanisms as a basis for the development of new strategies in the treatment of osteoporosis. The present study aimed to investigate the effectiveness of the activation of the ligand-dependent ER and the Wnt/β-catenin signal transduction pathways on mechanically induced bone formation using ovariectomized mice as a model of postmenopausal bone loss. We demonstrated that both pathways interact in the regulation of bone mass adaption in response to mechanical loading and that the activation of Wnt/β-catenin signaling considerably increased mechanically induced bone formation, whereas the effects of estrogen treatment strictly depended on the estrogen status in the mice.
Osteoporosis, or steroid-induced osteonecrosis of the hip, is accompanied by increased bone marrow adipogenesis. Such a disorder of adipogenic/osteogenic differentiation, affecting bone-marrow-derived mesenchymal stem cells (BMSCs), contributes to bone loss during aging. Here, we investigated the effects of extracellular vesicles (EVs) isolated from human (h)BMSCs during different stages of osteogenic differentiation on the osteogenic and adipogenic differentiation capacity of naïve (undifferentiated) hBMSCs. We observed that all EV groups increased viability and proliferation capacity and suppressed the apoptosis of naïve hBMSCs. In particular, EVs derived from hBMSCs at late-stage osteogenic differentiation promoted the osteogenic potential of naïve hBMSCs more effectively than EVs derived from naïve hBMSCs (naïve EVs), as indicated by the increased gene expression of COL1A1 and OPN. In contrast, the adipogenic differentiation capacity of naïve hBMSCs was inhibited by treatment with EVs from osteogenic differentiated hBMSCs. Proteomic analysis revealed that osteogenic EVs and naïve EVs contained distinct protein profiles, with pro-osteogenic and anti-adipogenic proteins encapsulated in osteogenic EVs. We speculate that osteogenic EVs could serve as an intercellular communication system between bone- and bone-marrow adipose tissue, for transporting osteogenic factors and thus favoring pro-osteogenic processes. Our data may support the theory of an endocrine circuit with the skeleton functioning as a ductless gland.
The present study aimed to evaluate the effect of high intensity dynamic resistance exercise (HIT-DRT) and whey protein supplementation (WPS) on bone mineral density (BMD) and sarcopenia parameters in osteosarcopenic men. Men ≥ 72 years with osteosarcopenia (n = 43) were randomly assigned to a HIT-RT (HIT-RT: n = 21) or a non-training control group (n = 22). Supervised HIT-RT twice/week was applied for 18 months, while the control group maintained their habitual lifestyle. Supplying WPS, total protein intake amounted to 1.5–1.6 (HIT-RT) and 1.2 g/kg/body mass/d (control). Both groups were supplied with calcium and vitamin D. Primary study outcomes were BMD and the sarcopenia Z-score. After adjusting for multiplicity, we observed significant positive effects for sarcopenia Z-score (standardized mean difference (SMD): 1.40), BMD at lumbar spine (SMD: 0.72) and total hip (SMD: 0.72). In detail, effect sizes for skeletal muscle mass changes were very pronounced (1.97, p < 0.001), while effects for functional sarcopenia parameters were moderate (0.87, p = 0.008; handgrip strength) or low (0.39, p = 0.209; gait velocity). Apart from one man who reported short periods of temporary worsening of existing joint pain, no HIT-RT/WPS-related adverse effects or injuries were reported. We consider HIT-RT supported by whey protein supplementation as a feasible, attractive, safe and highly effective option to fight osteosarcopenia in older men.