Necroptosis pathway components (RIPK1/RIPK3/MLKL axis)

Necroptosis is a regulated, caspase-independent form of necrotic cell death characterized by cellular swelling, organelle dysfunction, and plasma membrane rupture. The core machinery of this pathway consists of Receptor-interacting serine/threonine-protein kinase 1 (RIPK1), Receptor-interacting serine/threonine-protein kinase 3 (RIPK3), and the pseudokinase Mixed lineage kinase domain-like protein (MLKL). Upon activation by stimuli such as tumor necrosis factor (TNF), Toll-like receptor ligands, or viral infection, RIPK1 and RIPK3 interact via their RIP homotypic interaction motif (RHIM) domains to form a signaling complex known as the necrosome. Within this complex, RIPK3 phosphorylates MLKL, triggering its oligomerization and translocation to the plasma membrane, where it forms pores that lead to cell lysis and the release of pro-inflammatory damage-associated molecular patterns (DAMPs). This pathway is a critical driver of pathology in various conditions, including neurodegenerative diseases, inflammatory disorders, and ischemia-reperfusion injuries, making its components high-priority targets for therapeutic intervention.

Other names

Programmed necrosis pathwayRIPK1-RIPK3-MLKL axisNecrosome complexRegulated necrosis pathway

Inhibition of RIPK1 or RIPK3 kinase activity to prevent necrosome formation; inhibition of MLKL oligomerization or membrane translocation to prevent pore formation and cell lysis.