tailieunhanh - Báo cáo y học: "Anabolic and catabolic responses of human articular chondrocytes to varying oxygen percentages"

Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học General Psychiatry cung cấp cho các bạn kiến thức về ngành y đề tài: Anabolic and catabolic responses of human articular chondrocytes to varying oxygen percentages. | Strobel et al. Arthritis Research Therapy 2010 12 R34 http content 12 2 R34 RESEARCH ARTICLE Open Access Anabolic and catabolic responses of human articular chondrocytes to varying oxygen percentages 1 1 2 4 Simon Strobel Marko Loparic David Wendt Andreas D Schenk Christian Candrian Raija LP Lindberg Florina Moldovan5 Andrea Barbero1 Ivan Martin1 Abstract Introduction Oxygen is a critical parameter proposed to modulate the functions of chondrocytes ex-vivo as well as in damaged joints. This article investigates the effect of low more physiological oxygen percentage on the biosynthetic and catabolic activity of human articular chondrocytes HAC at different phases of in vitro culture. Methods HAC expanded in monolayer were cultured in pellets for two weeks Phase I or up to an additional two weeks Phase II . In each Phase cells were exposed to 19 or 5 oxygen. Resulting tissues and culture media were assessed to determine amounts of produced released proteoglycans and collagens metalloproteinases MMPs collagen degradation products and collagen fibril organization using biochemical immuno -histochemical gene expression and scanning electron microscopy analyses. In specific experiments the hypoxia-inducible factor-1a HIF-1a inhibitor cadmium chloride was supplemented in the culture medium to assess the involvement of this pathway. Results Independent from the oxygen percentage during expansion HAC cultured at 5 O2 vs 19 O2 during Phase I accumulated higher amounts of glycosaminoglycans and type II collagen and expressed reduced levels of MMP-1 and MMP-13 mRNA and protein. Switching to 19 oxygen during Phase II resulted in reduced synthesis of proteoglycan and collagen increased release of MMPs accumulation of type II collagen fragments and higher branching of collagen fibrils. In contrast reducing O2 during Phase II resulted in increased proteoglycan and type II collagen synthesis and reduced expression and release of MMP-13 mRNA and .

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