Cellular apoptotic machinery (AM)

The cellular apoptotic machinery is a complex, evolutionarily conserved system of proteins and signaling pathways responsible for executing programmed cell death, or apoptosis. It is fundamentally divided into the intrinsic (mitochondrial) and extrinsic (death receptor) pathways, which converge on the activation of a family of cysteine proteases known as caspases (1, 6). Key components include the Bcl-2 family of proteins, which regulate mitochondrial membrane permeability, and the Inhibitor of Apoptosis Proteins (IAPs) that directly suppress caspase activity (2, 7). Dysregulation of this machinery is a hallmark of many diseases; for instance, cancer cells often overexpress anti-apoptotic proteins like Bcl-2 to evade death, while excessive apoptosis contributes to neurodegenerative and cardiovascular disorders (3, 9). Therapeutic strategies targeting this machinery aim to restore the cell's ability to undergo apoptosis, particularly in oncology (4, 11). Drugs such as Venetoclax (a Bcl-2 inhibitor) and various SMAC mimetics have been developed to neutralize anti-apoptotic factors and sensitize tumor cells to death-inducing stimuli (7, 14). However, targeting these pathways presents challenges, including potential toxicity to healthy tissues and the development of drug resistance (7, 9).

Other names

Apoptotic machineryApoptosis pathwayProgrammed cell death machineryCore apoptotic machinery

Induction of programmed cell death through the activation of the intrinsic or extrinsic pathways, inhibition of anti-apoptotic proteins (e.g., Bcl-2, IAPs), and direct activation of the caspase cascade.