| Literature DB >> 20495569 |
Siyoung Yang1, Jonghwan Kim, Je-Hwang Ryu, Hwanhee Oh, Churl-Hong Chun, Byoung Ju Kim, Byoung Hyun Min, Jang-Soo Chun.
Abstract
Osteoarthritic cartilage destruction is caused by an imbalance between anabolic and catabolic factors. Here, we show that hypoxia-inducible factor-2alpha (HIF-2alpha, encoded by EPAS1) is a catabolic transcription factor in the osteoarthritic process. HIF-2alpha directly induces the expression in chondrocytes of genes encoding catabolic factors, including matrix metalloproteinases (MMP1, MMP3, MMP9, MMP12 and MMP13), aggrecanase-1 (ADAMTS4), nitric oxide synthase-2 (NOS2) and prostaglandin-endoperoxide synthase-2 (PTGS2). HIF-2alpha expression was markedly increased in human and mouse osteoarthritic cartilage, and its ectopic expression triggered articular cartilage destruction in mice and rabbits. Moreover, mice transgenic for Epas1 only in chondrocytes showed spontaneous cartilage destruction, whereas heterozygous genetic deletion of Epas1 in mice suppressed cartilage destruction caused by destabilization of the medial meniscus (DMM) or collagenase injection, with concomitant modulation of catabolic factors. Our results collectively demonstrate that HIF-2alpha causes cartilage destruction by regulating crucial catabolic genes.Entities:
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Year: 2010 PMID： 20495569 DOI： 10.1038/nm.2153
Source DB: PubMed Journal: Nat Med ISSN： 1078-8956 Impact factor: 53.440