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IL-1 beta protects human chondrocytes from CD95-induced apoptosis
1Division of Arthritis Research, Department of Molecular Medicine, The Scripps Research Institute, La Jolla, CA 92037, USA.
Journal of Immunology (Baltimore, Md. : 1950)
|February 5, 2000
Summary
Interleukin-1 beta (IL-1 beta) protects human articular chondrocytes from CD95-induced apoptosis. This protective effect involves tyrosine phosphorylation and NF-kappa B activation, not nitric oxide or prostaglandins.
Area of Science:
- Immunology
- Cell Biology
- Biochemistry
Background:
- Apoptosis, or programmed cell death, is crucial in maintaining tissue homeostasis.
- The CD95 (Fas) receptor pathway is a key mediator of apoptosis.
- Interleukin-1 beta (IL-1 beta) is a pro-inflammatory cytokine with complex roles in cellular processes.
Purpose of the Study:
- To investigate the role of IL-1 beta in modulating CD95-induced apoptosis in human articular chondrocytes.
- To elucidate the molecular mechanisms underlying IL-1 beta's protective effects.
Main Methods:
- Primary human articular chondrocytes were treated with agonistic anti-CD95 antibodies.
- The effects of IL-1 beta on apoptosis were assessed.
- Inhibitors of nitric oxide synthase, cyclooxygenase, NF-kappa B, and protein tyrosine kinases were used.
- Expression of Bcl-2 was measured.
Main Results:
- IL-1 beta significantly inhibited anti-CD95 antibody-induced apoptosis in chondrocytes.
- The protective effect was partially reversed by inhibiting NF-kappa B induction.
- IL-1 beta increased Bcl-2 expression.
- Inhibition of protein tyrosine kinase activity abolished the protective effect of IL-1 beta.
Conclusions:
- IL-1 beta exerts an anti-apoptotic effect on CD95-mediated cell death in chondrocytes.
- This protection is mediated through mechanisms involving tyrosine phosphorylation and NF-kappa B-dependent gene activation.
- Nitric oxide and prostaglandins are not involved in IL-1 beta's modulation of CD95-induced apoptosis.