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BH3-only proteins in apoptosis and beyond: an overview

Abstract

BH3-only BCL-2 family proteins are effectors of canonical mitochondrial apoptosis. They discharge their pro-apoptotic functions through BH1–3 pro-apoptotic proteins such as BAX and BAK, while their activity is suppressed by BH1–4 anti-apoptotic BCL-2 family members. The precise mechanism by which BH3-only proteins mediate apoptosis remains unresolved. The existing data are consistent with three mutually non-exclusive models (1) displacement of BH1–3 proteins from complexes with BH1–4 proteins; (2) direct interaction with and conformational activation of BH1–3 proteins; and (3) membrane insertion and membrane remodeling. The BH3-only proteins appear to play critical roles in restraining cancer and inflammatory diseases such as rheumatoid arthritis. Molecules that mimic the effect of BH3-only proteins are being used in treatments against these diseases. The cell death activity of a subclass of BH3-only members (BNIP3 and BNIP3L) is linked to cardiomyocyte loss during heart failure. In addition to their established role in apoptosis, several BH3-only members also regulate diverse cellular functions in cell-cycle regulation, DNA repair and metabolism. Several members are implicated in the induction of autophagy and autophagic cell death, possibly through unleashing of the BH3-only autophagic effector Beclin 1 from complexes with BCL-2/BCL-xL. The Chapters included in the current Oncogene Review issues provide in-depth discussions on various aspects of major BH3-only proteins.

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Acknowledgements

GC received grant support from the National Cancer Institute Grants CA-33616, CA-116262 and CA-73803. We thank John Tavis, Ling-jun Zhao and Carolyn Mulhall for reading the paper.

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Correspondence to G Chinnadurai.

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Lomonosova, E., Chinnadurai, G. BH3-only proteins in apoptosis and beyond: an overview. Oncogene 27 (Suppl 1), S2–S19 (2008). https://doi.org/10.1038/onc.2009.39

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