Cited by 125Osteoarthritis Treatment and MechanismsHip disorders and treatmentsProteoglycans and glycosaminoglycans research

Hypoxia-inducible factor-2α regulates Fas-mediated chondrocyte apoptosis during osteoarthritic cartilage destruction

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Ryu, J-H, Shin, Y, Huh, Y H, Yang, S, Chun, C-H, Chun, J-S·2012·Cell Death & Differentiation

Abstract

Apoptosis of articular chondrocytes is associated with the pathogenesis of osteoarthritis (OA). Recently, we demonstrated that hypoxia-inducible factor (HIF)-2α, encoded by Epas1, causes OA cartilage destruction by regulating the expression of various matrix-degrading enzymes. Here, we investigated the involvement of HIF-2α in chondrocyte apoptosis and OA cartilage destruction. HIF-2α levels in human and mouse OA chondrocytes were markedly elevated in association with increased apoptosis of articular chondrocytes. Overexpression or knockdown of HIF-2α alone did not cause chondrocyte apoptosis. However, HIF-2α expression markedly increased chondrocyte apoptosis in the presence of an agonistic anti-Fas (CD95) antibody. HIF-2α enhanced Fas expression and potentiated downstream signaling pathways, increasing the activity of initiator and executioner caspases. Overexpression of HIF-2α in mouse cartilage tissue, either by intra-articular injection of Epas1 adenovirus (Ad-Epas1) or in the context of chondrocyte-specific Epas1 transgenic mice, increased chondrocyte apoptosis and cartilage destruction. In contrast, chondrocyte-specific knockout of Epas1 in mice suppressed DMM (destabilization of the medial meniscus)-induced chondrocyte apoptosis and inhibited OA cartilage destruction. Moreover, Fas-deficient mice exhibited diminished chondrocyte apoptosis and OA cartilage destruction in response to Ad-Epas1 injection or DMM surgery. Taken together, our results demonstrate that HIF-2α potentiates Fas-mediated chondrocyte apoptosis, which is associated with OA cartilage destruction.

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  • A stress-induced increase in HIF-2α activity overshadows HIF-1α and drives osteoarthritis changes.

    “According to this paradigm, a stress-induced increase in the activity of HIF-2α will overshadow the beneficial effects of the closely related HIF-1α, then push the chondrocytes in the joint toward a more differentiated state known as hypertrophy, which then drives osteoarthritis changes [6,7].”

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Authors
Ryu, J.-H., Shin, Y., Huh, Y. H., Yang, S., Chun, C.-H., & Chun, J.-S.
Affiliations
  • Gwangju Institute of Science and Technology (KR)
  • Wonkwang University Hospital (KR)
Corresponding author
Chun, J-S
Venue
Cell Death & Differentiation
Published
2011-08-26
Volume
19
Issue
3
Pages
440-450
ISSN
  • 1350-9047 (ISSN-L)
  • 1476-5403
OpenAlex
W1971564704
Cited by
123
References
39
Citations by year
2026: 5 · 2025: 3 · 2024: 13 · 2023: 14 · 2022: 8 · 2021: 13 · 2020: 11 · 2019: 8 · 2018: 4 · 2017: 5 · 2016: 9 · 2015: 14 · 2014: 10 · 2013: 4 · 2012: 2
FWCI
3.74
Type
journal article
Language
en
Open access
Locations
  • Cell Death and Differentiation (publishedVersion, cc-by-nc-nd)
  • PubMed Central (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
Funders
  • National Research Foundation
  • National Research Foundation of Korea
Topics
  • Health Sciences › Medicine › Rheumatology › Osteoarthritis Treatment and Mechanisms
  • Health Sciences › Medicine › Surgery › Hip disorders and treatments
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Proteoglycans and glycosaminoglycans research
Keywords
HIF-2α, EPAS1, Fas, chondrocyte apoptosis, osteoarthritis, cartilage destruction, caspase activation, destabilization of the medial meniscus, Fas-deficient mice, articular cartilage
MeSH terms
Endothelial PAS Domain-Containing Protein 1, Animals, Cartilage, Cells, Cultured, Gene Expression Regulation, Humans, Mice, Transgenic, Osteoarthritis, Signal Transduction, Apoptosis, fas Receptor, Chondrocytes, Mice, Basic Helix-Loop-Helix Transcription Factors, Basic Helix-Loop-Helix Proteins

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