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Bcl-xS and Bax induce different apoptotic pathways in PC12 cells
L Lindenboim1, J Yuan, R Stein
1Department of Neurobiochemistry, George S. Wise Faculty of Life Sciences, Tel Aviv University, Ramat Aviv, Israel.
Oncogene
|April 25, 2000
Summary
This study reveals that Bcl-xS and Bax proteins trigger distinct apoptosis pathways in PC12 cells. Bcl-xS-induced cell death is caspase-dependent and inhibited by NGF, while Bax-induced death is caspase-independent.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Apoptosis, or programmed cell death, is tightly regulated by the Bcl-2 protein family.
- Key members include pro-apoptotic proteins like Bax and anti-apoptotic proteins like Bcl-xL.
- The precise mechanisms of Bcl-xS-induced apoptosis and its regulation remain incompletely understood.
Purpose of the Study:
- To compare the apoptotic effects of Bcl-xS and Bax in PC12 cells, a neuronal apoptosis model.
- To investigate the role of nerve growth factor (NGF) in protecting against apoptosis induced by these proteins.
- To elucidate the specific cell death pathways mediated by Bcl-xS and Bax.
Main Methods:
- Utilized PC12 cells, a pheochromocytoma cell line, for apoptosis studies.
- Employed subcellular fractionation to determine protein localization.
- Investigated apoptosis induction via overexpression of Bcl-xS and Bax, with and without co-expression of Bcl-2, Bcl-xL, or treatment with caspase inhibitors (Z-VAD-FMK) and NGF.
Main Results:
- Overexpression of Bcl-xS or Bax induced cell death in PC12 cells.
- Bcl-xS-induced apoptosis was caspase-dependent, inhibited by Bcl-2, Bcl-xL, Z-VAD-FMK, and NGF.
- Bax-induced apoptosis was caspase-independent, inhibited by Bcl-2 and Bcl-xL, but not by Z-VAD-FMK or NGF.
Conclusions:
- Bcl-xS and Bax activate distinct apoptotic pathways in PC12 cells.
- Bcl-xS triggers a caspase-mediated pathway sensitive to NGF signaling.
- Bax initiates a caspase-independent pathway regulated by Bcl-2 but not NGF.