Phosphoinositide phospholipase C (PLC) (PLC)

Phosphoinositide phospholipase C (PLC), also known as 1-phosphatidylinositol 4,5-bisphosphate phosphodiesterase, is a family of enzymes essential for eukaryotic signal transduction. These enzymes catalyze the hydrolysis of the membrane phospholipid phosphatidylinositol 4,5-bisphosphate (PIP2) into two critical second messengers: inositol 1,4,5-trisphosphate (IP3) and diacylglycerol (DAG) [PubMed: 28844071]. IP3 triggers the release of calcium from the endoplasmic reticulum, while DAG activates protein kinase C (PKC), together regulating diverse cellular processes such as proliferation, differentiation, and gene expression [UniProt: P19174]. The PLC family includes several isoforms (e.g., PLC-beta, PLC-gamma, PLC-delta) that are activated by different cell surface receptors, including G protein-coupled receptors and receptor tyrosine kinases [PubMed: 30635414]. Dysregulation of PLC activity is implicated in various diseases, including cancer, where it can promote tumor growth and metastasis, and immune disorders like autoinflammation or immunodeficiency associated with PLC-gamma 2 mutations [PubMed: 30635414]. Consequently, PLC isoforms are significant therapeutic targets in oncology and immunology. While direct inhibitors like edelfosine have been explored, many current clinical strategies involve indirect modulation through upstream kinases, such as Bruton's tyrosine kinase (BTK) inhibitors used in B-cell malignancies [PubMed: 24172124]. Developing isoform-specific inhibitors remains a major focus for achieving therapeutic efficacy while minimizing off-target effects [PubMed: 22430132].

Other names

1-phosphatidylinositol 4,5-bisphosphate phosphodiesterasePhospholipase CPI-PLCTriphosphoinositide phosphodiesterasePhosphoinositide-specific phospholipase C

Hydrolysis of phosphatidylinositol 4,5-bisphosphate (PIP2) into inositol 1,4,5-trisphosphate (IP3) and diacylglycerol (DAG), which act as second messengers to mobilize intracellular calcium and activate protein kinase C [PubMed: 28844071].