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Hypoxia-inducible factor-2alpha is a catabolic regulator of osteoarthritic cartilage destruction.

Authors
Yang, S; Kim, J; Ryu, JH; Oh, H; Chun, CH; Kim, BJ; Min, B; Chun, JS
Citation
Nature medicine, 16(6):687-693, 2010
Journal Title
Nature medicine
ISSN
1078-89561546-170X
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.
MeSH terms
AnimalsBasic Helix-Loop-Helix Transcription Factors/physiology*Cartilage/metabolism*Cartilage/physiopathologyChondrocytes/metabolismChondrocytes/physiologyCollagenases/metabolismCollagenases/physiologyCyclic AMP Receptor Protein/geneticsCyclic AMP Receptor Protein/physiologyGene Expression Regulation/geneticsGene Expression Regulation/physiologyGene Knockdown TechniquesGenes/geneticsGenes/physiologyHumansMaleMiceMice, Inbred C57BLMice, Inbred CBAMice, Inbred ICRMice, TransgenicOsteoarthritis/metabolism*Osteoarthritis/physiopathologyRabbitsTranscription Factors/physiology*
DOI
10.1038/nm.2153
PMID
20495569
Appears in Collections:
Journal Papers > School of Medicine / Graduate School of Medicine > Orthopedic Surgery
AJOU Authors
민, 병현
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