Phospholipid Signaling Pathway

The phospholipid signaling pathway is a fundamental cellular mechanism in which membrane phospholipids act as precursors for the generation of lipid-derived second messengers. These messengers transmit signals from activated cell surface receptors to intracellular targets, orchestrating diverse physiological responses such as cell proliferation, differentiation, migration, and survival. Key components include phospholipids (PIP2, PC), enzymes (PLC, PLD, PLA2), and second messengers (DAG, IP3). Upon ligand binding to receptors, PLC activation cleaves PIP2 into DAG and IP3. IP3 triggers Ca²⁺ release, and elevated Ca²⁺ with DAG activates PKC family enzymes, which phosphorylate downstream targets. Other branches involve PLD generating PA or PLA2 producing modulatory lipids. It regulates cell growth, differentiation, apoptosis, vesicular trafficking, and immune responses. Dysregulation is implicated in cancer, neurological disorders, and metabolic diseases.

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