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Status: Bibliographieeintrag

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Verfasst von:Praxenthaler, Heiko [VerfasserIn]   i
 Krämer, Elisabeth [VerfasserIn]   i
 Weisser, Melanie Bianca [VerfasserIn]   i
 Hecht, Nicole [VerfasserIn]   i
 Fischer, Jennifer [VerfasserIn]   i
 Grossner, Tobias [VerfasserIn]   i
 Richter, Wiltrud [VerfasserIn]   i
Titel:Extracellular matrix content and WNT/β-catenin levels of cartilage determine the chondrocyte response to compressive load
Verf.angabe:Heiko Praxenthaler, Elisabeth Krämer, Melanie Weisser, Nicole Hecht, Jennifer Fischer, Tobias Grossner, Wiltrud Richter
Jahr des Originals:2017
Umfang:9 S.
Fussnoten:Available online 19 December 2017 ; Gesehen am 19.10.2018
Titel Quelle:Enthalten in: Biochimica et biophysica acta / Molecular basis of disease
Jahr Quelle:2018
Band/Heft Quelle:1864(2018), 3, S. 851-859
ISSN Quelle:1879-260X
Abstract:During osteoarthritis (OA)-development extracellular matrix (ECM) molecules are lost from cartilage, thus changing gene-expression, matrix synthesis and biomechanical competence of the tissue. Mechanical loading is important for the maintenance of articular cartilage; however, the influence of an altered ECM content on the response of chondrocytes to loading is not well understood, but may provide important insights into underlying mechanisms as well as supplying new therapies for OA. Objective here was to explore whether a changing ECM-content of engineered cartilage affects major signaling pathways and how this alters the chondrocyte response to compressive loading. Activity of canonical WNT-, BMP-, TGF-β- and p38-signaling was determined during maturation of human engineered cartilage and followed after exposure to a single dynamic compression-episode. WNT/β-catenin- and pSmad1/5/9-levels declined with increasing ECM-content of cartilage. While loading significantly suppressed proteoglycan-synthesis and ACAN-expression at low ECM-content this catabolic response then shifted to an anabolic reaction at high ECM-content. A positive correlation was observed between GAG-content and load-induced alteration of proteoglycan-synthesis. Induction of high β-catenin levels by the WNT-agonist CHIR suppressed load-induced SOX9- and GAG-stimulation in mature constructs. In contrast, the WNT-antagonist IWP-2 was capable of attenuating load-induced GAG-suppression in immature constructs. In conclusion, either ECM accumulation-associated or pharmacologically induced silencing of WNT-levels allowed for a more anabolic reaction of chondrocytes to physiological loading. This is consistent with the role of proteoglycans in sequestering WNT-ligands in the ECM, thus reducing WNT-activity and also provides a novel explanation of why low WNT-activity in cartilage protects from OA-development in mechanically overstressed cartilage.
DOI:doi:10.1016/j.bbadis.2017.12.024
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

Verlag: http://dx.doi.org/10.1016/j.bbadis.2017.12.024
 Verlag: http://www.sciencedirect.com/science/article/pii/S0925443917304787
 DOI: https://doi.org/10.1016/j.bbadis.2017.12.024
Datenträger:Online-Ressource
Sprache:eng
K10plus-PPN:1582131430
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