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Apoptosis in normal and osteoarthritic human articular cartilage
F Héraud1, A Héraud, M F Harmand
1INSERM U443, Victor Segalen University, Bordeaux, France.
Annals of the Rheumatic Diseases
|November 23, 2000
Summary
Apoptosis, or programmed cell death, is significantly higher in osteoarthritis (OA) cartilage. Human recombinant interleukin-1beta (hrIL1beta) also increases chondrocyte apoptosis, suggesting a new therapeutic target for OA.
Area of Science:
- Cell biology
- Orthopedics
- Rheumatology
Background:
- Osteoarthritis (OA) is a degenerative joint disease characterized by cartilage breakdown.
- The role of programmed cell death (apoptosis) in OA pathogenesis is not fully understood.
Purpose of the Study:
- To determine if apoptosis occurs in human osteoarthritis (OA) cartilage.
- To investigate the effect of human recombinant interleukin-1beta (hrIL1beta) on chondrocyte apoptosis.
Main Methods:
- Human articular cartilage from OA patients (n=14) and controls (n=4) was analyzed.
- Apoptosis was quantified in situ and in vitro using TUNEL and Annexin-V-fluos assays.
Main Results:
- OA cartilage exhibited significantly higher chondrocyte apoptosis (18-21%) compared to normal cartilage (2-5%).
- hrIL1beta dose-dependently increased apoptosis in both OA and normal chondrocytes in vitro.
Conclusions:
- Apoptosis is a prevalent feature in OA cartilage.
- Chondrocyte apoptosis, modulated by hrIL1beta, represents a potential therapeutic target for osteoarthritis.