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Induction of apoptosis in AK-5 cells by rotenone involves participation of caspases
1Centre for Cellular and Molecular Biology, Hyderabad, India. khar@ccmb.ap.nic.in
Abstract:
AK-5 tumour cells undergo apoptosis after treatment with rotenone an electron transport inhibitor and oligomycin which inhibits mitochondrial ATPases. Apoptotic process involves the induction of caspases 2 and 3, whereas caspase 1 does not seem to be participating in rotenone/oligomycin induced apoptosis. DEVD which is a specific inhibitor of caspase 3, inhibited apoptosis in AK-5 cells. We have also observed a significant lowering of intracellular pH in AK-5 cells which are induced into the apoptotic process by rotenone. These results suggest an important role for mitochondrial electron transport in the induction of apoptosis in AK-5 tumour cells.
Insights
Rotenone and oligomycin trigger apoptosis in AK-5 tumor cells by inhibiting mitochondrial function. This programmed cell death involves caspases 2 and 3, and a drop in intracellular pH.
Area of Science:
- Biochemistry
- Cell Biology
- Cancer Research
Background:
- Mitochondrial dysfunction is implicated in various diseases, including cancer.
- Understanding the mechanisms of apoptosis induction is crucial for developing targeted cancer therapies.
Purpose of the Study:
- To investigate the role of mitochondrial electron transport in rotenone/oligomycin-induced apoptosis in AK-5 tumor cells.
- To elucidate the specific caspases involved in this apoptotic pathway.
Main Methods:
- Treatment of AK-5 tumor cells with rotenone and oligomycin.
- Analysis of caspase activation (caspase 1, 2, and 3).
- Assessment of intracellular pH changes.
- Use of DEVD, a specific caspase 3 inhibitor.
Main Results:
- Rotenone and oligomycin induced apoptosis in AK-5 cells.
- Caspases 2 and 3 were activated, while caspase 1 was not.
- DEVD significantly inhibited apoptosis, confirming caspase 3's role.
- A significant decrease in intracellular pH was observed during rotenone-induced apoptosis.
Conclusions:
- Mitochondrial electron transport inhibition is a key factor in inducing apoptosis in AK-5 tumor cells.
- Caspase 3 plays a critical role in this specific apoptotic pathway.
- Mitochondrial dysfunction and subsequent pH changes are important events in tumor cell apoptosis.