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Bcl-xL/Bcl-2 coordinately regulates apoptosis, cell cycle arrest and cell cycle entry
Yelena M Janumyan1, Courtney G Sansam, Anuja Chattopadhyay
1Department of Cancer Biology, Vanderbilt-Ingram Cancer Center, Vanderbilt University School of Medicine, Nashville, TN 37232, USA.
The EMBO Journal
|October 9, 2003
Summary
Bcl-x(L) and Bcl-2 proteins inhibit apoptosis and cell proliferation. These proteins enhance G(0) arrest, contributing to cell cycle delay, with both functions arising from intrinsic properties.
Area of Science:
- Molecular Biology
- Cell Biology
- Biochemistry
Background:
- Bcl-x(L) and Bcl-2 are key regulators of apoptosis and cell proliferation.
- Understanding the relationship between their anti-apoptotic and cell cycle functions is crucial.
Purpose of the Study:
- To investigate the relationship between the apoptosis inhibition and cell cycle regulation functions of Bcl-x(L) and Bcl-2.
- To determine the specific phase of the cell cycle (G(0) or G(1)) affected by Bcl-x(L) and Bcl-2.
Main Methods:
- Analysis of 24 Bcl-x(L) and Bcl-2 mutant alleles.
- Forward scatter and pyronin Y fluorescence measurements.
- Assessment of cell cycle entry kinetics and G(0) arrest efficacy.
Main Results:
- Cell cycle delay and anti-apoptosis functions of Bcl-x(L) and Bcl-2 co-segregated across all analyzed mutants.
- Bcl-2 and Bcl-x(L) proteins enhance G(0) arrest and delay the G(0)-G(1) transition.
- The Bad protein reversed the cell cycle effects of Bcl-2 and Bcl-x(L).
Conclusions:
- The cell cycle delay observed is significantly contributed by the enhanced G(0) arrest mediated by Bcl-x(L) and Bcl-2.
- Both cell cycle regulation and enhanced survival appear to be intrinsic functions of Bcl-2 and Bcl-x(L).