The actions of many hormones, neurotransmitters, and growth factors are mediated by the hydrolysis of phosphatidylinositol 4, 5-bisphosphate catalyzed by specific isozymes of phospholipase C. This hydrolysis releases inositol 1, 4, 5-trisphosphate, which mobilizes Ca2+ ions from components of the endoplasmic reticulum, and 1, 2-diacylglycerol, which activates isozymes of protein kinase C. The hormones and neurotransmitters activate p-isozymes of phospholipase C through receptors that have seven transmembrane segments and couple to G proteins of the Gq and Gvo families. Activation of phospholipase C by the Gq family involves their a-subunits, whereas activation by the Gvo family involves their by-subunits. The growth factors activate y-isozymes of phospholipase C through receptors that become autophosphorylated due to their stimulated tyrosine kinase activity and provide binding sites for the Src homology domains of the isozymes. The molecular mechanisms by which agonists activate phopholipase isozymes are described in detail.