Phospholipase C Signaling Mechanisms in Cellular Processes
Summary
Phospholipase C (PLC) enzymes constitute a pivotal hub in cellular signalling by hydrolysing the membrane lipid phosphatidylinositol 4,5-bisphosphate (PIP₂) to generate the second messengers diacylglycerol (DAG) and inositol 1,4,5-trisphosphate (IP₃). These mediators respectively recruit and activate protein kinase C (PKC) isoforms at the membrane and trigger Ca²⁺ release from intracellular stores, thereby orchestrating diverse processes including cell proliferation, differentiation, migration and gene expression. Seven classes and over a dozen isozymes of mammalian PLC have been identified, each defined by unique regulatory domains that determine activation by G protein-coupled receptors (GPCRs), receptor tyrosine kinases and small GTPases such as Ras. Spatial control of PLC activity—through membrane targeting, autoinhibition and compartmentalisation—ensures precise timing and amplitude of downstream signals. Dysregulation of PLC pathways has been implicated in cardiovascular disorders, neurodevelopmental syndromes, immune dysfunction and cancer, underlining both the fundamental biological importance of PIP₂ hydrolysis and the therapeutic potential of selectively modulating individual PLC isozymes.
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Phospholipase C Signaling Mechanisms in Cellular Processes publication trend
The graph below shows the total number of articles in phospholipase c signaling mechanisms in cellular processes across all publications each year (not limited to Nature Index journals).
Technical terms
Phosphatidylinositol 4,5-bisphosphate (PIP₂): A minor yet critical plasma-membrane phospholipid substrate for PLC enzymes.
Diacylglycerol (DAG): A lipid second messenger that recruits and activates protein kinase C at membranes.
Inositol 1,4,5-trisphosphate (IP₃): A soluble second messenger that binds endoplasmic reticulum receptors to release Ca²⁺.
G protein-coupled receptor (GPCR): A seven-transmembrane receptor that activates heterotrimeric G proteins to regulate PLCβ isozymes.
Protein kinase C (PKC): A family of serine/threonine kinases activated by DAG and Ca²⁺, modulating diverse downstream pathways.
References
- Gβγ activates PIP2 hydrolysis by recruiting and orienting PLCβ on the membrane surface. Proceedings of the National Academy of Sciences of the United States of America (2023).
- PLCβ1 by-passes early growth response -1 to induce the differentiation of neuronal cells. Cell Death Discovery (2024).
- Emerging Roles of Phospholipase C Beta Isozymes as Potential Biomarkers in Cardiac Disorders. International Journal of Molecular Sciences (2023).
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