Apoptotic machinery in human monocytic cells

The apoptotic machinery in human monocytic cells refers to the collective network of proteins and signaling pathways that regulate and execute programmed cell death in monocytes and macrophages. This system is divided into the intrinsic (mitochondrial) pathway, which is controlled by the balance of pro- and anti-apoptotic Bcl-2 family members, and the extrinsic (death receptor) pathway, which is initiated by ligands such as TNF-alpha or TRAIL binding to their respective receptors. In monocytic cells, this machinery is vital for maintaining immune homeostasis and resolving inflammatory responses by ensuring the timely removal of activated or infected cells. Dysregulation of these pathways, often through the overexpression of anti-apoptotic proteins like Bcl-2 or Mcl-1, is a key driver of survival in hematological malignancies such as Chronic Myelomonocytic Leukemia (CMML). Therapeutic intervention typically focuses on using BH3 mimetics to inhibit anti-apoptotic proteins or using DNA-damaging agents to trigger the intrinsic death cascade, thereby overcoming apoptosis resistance in malignant cells.

Other names

Apoptosis pathwayProgrammed cell death machineryApoptotic signaling cascadeCore apoptotic machinery

Induction of programmed cell death through the inhibition of anti-apoptotic proteins (e.g., Bcl-2, Mcl-1) or the direct activation of pro-apoptotic signaling cascades (e.g., caspases).