Intracellular apoptosis machinery

The intracellular apoptosis machinery is a complex network of proteins and signaling pathways responsible for executing programmed cell death (PMC409892). It is broadly categorized into the intrinsic (mitochondrial) pathway, regulated by the Bcl-2 family of proteins, and the extrinsic (death receptor) pathway, initiated by extracellular ligands such as TRAIL (JCI, 2024). Key molecular components include caspases, which act as proteolytic executioners, and the inhibitor of apoptosis (IAP) proteins, which serve as endogenous brakes on the system (PMC11135444). Dysregulation of this machinery is a fundamental hallmark of cancer, where evasion of apoptosis allows for uncontrolled tumor growth and resistance to therapy (PMC2634616). Conversely, excessive activation of these pathways contributes to neurodegenerative and cardiovascular diseases. Therapeutic interventions target specific nodes within this machinery, such as BCL-2 inhibitors (e.g., venetoclax) or SMAC mimetics, to restore apoptotic sensitivity in malignant cells (PMC11135444).

Other names

Apoptotic signaling pathwayProgrammed cell death machineryCore apoptotic machineryApoptotic cascade

Modulation of pro-apoptotic or anti-apoptotic proteins and enzymes to induce or inhibit programmed cell death.