Extrinsic Pathway for Apoptosis (Homo sapiens)

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Known as the "death receptor pathway" the extrinsic or caspase 8/10 dependent pathway is activated by ligand binding. The "death receptors" are specialized cell-surface receptors including Fas/CD95, tumor necrosis factor-alpha (TNF-alpha) receptor 1, and two receptors, DR4 and DR5, that bind to the TNF-alpha related apoptosis-inducing ligand (TRAIL). The extrinsic and intrinsic pathways unite in the activation of Caspase-3, though the two pathways communicate through the pro-apoptotic Bcl-2 family member Bid before uniting at the shared activation of Caspase-3.

• Cellular Process
• Homo sapiens