Anti-apoptotic proteins

Anti-apoptotic proteins are a class of proteins within the B-cell lymphoma-2 (BCL-2) family that prevent programmed cell death (apoptosis). They are crucial for cell survival, maintaining tissue homeostasis, and function by inhibiting pro-apoptotic signals. They are characterized by conserved BCL-2 homology (BH) domains and are primarily located on mitochondria, where they regulate cytochrome c release. Key members include BCL-2, BCL-XL, MCL-1, BFL-1, BCL-W, and BCL-B. Their overexpression is implicated in various diseases, most notably cancer, where they promote tumor cell survival and therapeutic resistance. Understanding their function and mechanisms provides potential targets for therapeutic intervention.

Other names

BCL-2 family anti-apoptotic proteinsBCL-2B-cell lymphoma 2BCL-XLBCL-2-like 1MCL-1Myeloid cell leukemia-1BFL-1BCL-2-related protein A1BCL2A1BCL-WBCL-2-like 2BCL-BBCL2L10

Therapeutic approaches involve the development of inhibitors that block the function of anti-apoptotic proteins, particularly in cancer. This can include blocking their direct inhibitory interactions with pro-apoptotic proteins like BAX and BAK, preventing mitochondrial membrane permeabilization, blocking the downstream caspase pathway, binding to BH3-only proteins, or inhibiting the generation of pro-apoptotic cytosolic calcium signals. Anticancer agents can also induce reactive oxygen species (ROS) generation, leading to mitochondrial membrane damage and activation of the apoptotic pathway, thus counteracting the anti-apoptotic effect.