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Non-steroidal anti-inflammatory drugs protect against chondrocyte apoptotic death
P Mukherjee1, C Rachita, P S Aisen
1Neuroinflammation Research Center, Department of Psychiatry, Mount Sinai School of Medicine, Box 1229, One Gustave L. Levy Place, New York, N.Y. 10029, USA.
Abstract:
Recent evidence suggests that the degradation of cartilage in osteoarthritis is characterized by chondrocyte apoptosis, but little is known about the molecular mechanisms involved or potential protective measures. In the present study, we used an immortalized chondrocyte cell line to explore the mechanisms of apoptotic chondrocyte cell death. We found that staurosporine-mediated chondrocyte death depended on the concentration and time of incubation, and coincided with increased Bax:Bcl-X mRNA expression, cytochrome C release, and activation of caspase-3. Pre-treatment of the cultures with nimesulide, a preferential cyclooxygenase (COX)-2 inhibitor, or with ibuprofen, a non-selective COX-1/COX-2 inhibitor, protected the chondrocytes against the staurosporine-mediated nuclear damage and cell death in a concentration-dependent manner (10(-12) to 10(-6) M). Cell protection coincided with inhibition of the staurosporine-mediated induction of caspase-3 activation. Notably, the selective COX-2 inhibitor NS-398 (10(-6) M, 24 hr pre-treatment) did not protect the cells against staurosporine-mediated apoptotic death. The data suggest that nimesulide and ibuprofen, in addition to their anti-inflammatory and analgesic benefits, may also have a protective effect in osteoarthritis through the inhibition of apoptosis in chondrocytes.
Insights
Osteoarthritis involves chondrocyte apoptosis. Nimesulide and ibuprofen protect these cells from death by inhibiting caspase-3 activation, suggesting a potential therapeutic role beyond pain relief.
Area of Science:
- Cell Biology
- Pharmacology
- Biochemistry
Background:
- Osteoarthritis (OA) is characterized by cartilage degradation.
- Chondrocyte apoptosis is implicated in OA pathogenesis.
- Molecular mechanisms and protective strategies for chondrocyte apoptosis remain unclear.
Purpose of the Study:
- To investigate the mechanisms of apoptotic chondrocyte cell death.
- To explore the potential protective effects of cyclooxygenase (COX) inhibitors on chondrocytes.
Main Methods:
- Utilized an immortalized chondrocyte cell line.
- Induced apoptosis using staurosporine.
- Assessed cell death, Bax:Bcl-X mRNA expression, cytochrome C release, and caspase-3 activation.
- Investigated the effects of nimesulide, ibuprofen, and NS-398 pre-treatment.
Main Results:
- Staurosporine induced chondrocyte death via increased Bax:Bcl-X, cytochrome C release, and caspase-3 activation.
- Nimesulide and ibuprofen protected chondrocytes from staurosporine-induced death and caspase-3 activation.
- Selective COX-2 inhibitor NS-398 did not provide protection.
Conclusions:
- Nimesulide and ibuprofen exhibit chondroprotective effects by inhibiting apoptosis.
- These COX inhibitors may offer therapeutic benefits in osteoarthritis beyond anti-inflammatory and analgesic properties.
- The protective mechanism involves the inhibition of caspase-3 activation.