Related Experiment Videos
Thiol-mediated apoptosis in prostate carcinoma cells
R N Coffey1, R W Watson, N J Hegarty
1Department of Surgery, University College Dublin, Mater Misericordiae Hospital, Ireland.
Cancer
|May 17, 2000
Summary
Thiol depletion effectively induces apoptosis in prostate cancer cells by activating caspase-3. This method shows promise for treating both androgen-sensitive and insensitive prostate carcinomas.
Area of Science:
- Cellular redox homeostasis
- Apoptosis induction mechanisms
- Prostate cancer therapeutics
Background:
- Glutathione (GSH) is crucial for cellular redox balance.
- Disruptions in GSH levels are linked to apoptosis.
- This study investigates the impact of thiol depletion on prostate cancer cells.
Purpose of the Study:
- To evaluate the effects of diethylmaleate (DEM), a thiol-depleting agent, on prostate carcinoma cells.
- To assess DEM's efficacy in both androgen-sensitive and insensitive cell lines.
- To explore mechanisms of DEM-induced apoptosis.
Main Methods:
- Utilized LNCaP and PC-3 prostate cancer cell lines.
- Induced apoptosis using DEM and diamide.
- Quantified apoptosis via flow cytometry (annexin V, propidium iodide) and DNA gel electrophoresis.
- Measured intracellular GSH, reactive oxygen intermediates, and protein expression (caspase-3, -8, Bcl-2, Bcl-XL).
- Assessed mitochondrial permeability.
Main Results:
- DEM and diamide induced apoptosis in both cell types.
- Apoptosis was dependent on caspase-3 but independent of caspase-8.
- Mitochondrial permeability changes were partially mitigated by bongkrekic acid, but apoptosis induction persisted.
- Decreased Bcl-2 and Bcl-XL expression correlated with caspase-3 activation.
Conclusions:
- Thiol depletion is an effective strategy for activating caspase-3 in prostate cancer cells.
- This approach can induce apoptosis in both androgen-sensitive and insensitive prostate carcinoma cells.
- Direct caspase-3 activation presents a potential therapeutic strategy for prostate cancer.