Apoptosis-related proteins

Apoptosis-related proteins constitute a broad functional class of molecules that orchestrate programmed cell death, a fundamental process for development and tissue homeostasis (StatPearls, 2023). This category encompasses several distinct families, most notably the BCL-2 family (including BCL-2, BAX, and BAK), the caspase family of cysteine proteases, and the Inhibitor of Apoptosis Proteins (IAPs) (NCBI, 2022). In healthy cells, these proteins maintain a delicate balance between pro-survival and pro-death signals; however, in many diseases, particularly cancer, this balance is skewed toward survival through the overexpression of anti-apoptotic proteins like BCL-2 or MCL-1 (Nature Reviews Cancer, 2020). Therapeutic intervention often involves the use of BH3 mimetics like venetoclax, which bind to and inhibit anti-apoptotic proteins, thereby lowering the threshold for cell death in malignant cells (PubChem, 2024). Beyond oncology, dysregulation of these proteins is a hallmark of neurodegenerative diseases, where excessive apoptosis leads to neuronal loss, and autoimmune diseases, where defective apoptosis allows the persistence of self-reactive lymphocytes (Cell Death & Differentiation, 2021).

Other names

Programmed cell death proteinsApoptotic regulatorsBCL-2 family proteinsCaspasesInhibitor of Apoptosis Proteins (IAPs)

Inhibition of anti-apoptotic BCL-2 family proteins; Mimicking BH3-only proteins to displace pro-apoptotic factors; Antagonizing Inhibitor of Apoptosis Proteins (IAPs); Direct activation of caspases; Inhibition of nuclear export of pro-apoptotic factors.