Invited Review ArticleRegulation of Phosphatidylinositol-specific Phospholipase C at the Nuclear Envelope in Cardiac MyocytesSmrcka, Alan V. PhDAuthor Information Department of Pharmacology and Physiology, University of Rochester School of Medicine and Dentistry, Rochester, NY. Reprints: Alan V. Smrcka, PhD, Department of Pharmacology and Physiology, University of Rochester School of Medicine and Dentistry, 601 Elmwood Avenue, Rochester, NY 14642 (e-mail: [email protected]). The author reports no conflicts of interest. Received August 19, 2014 Accepted November 11, 2014 Journal of Cardiovascular Pharmacology: March 2015 - Volume 65 - Issue 3 - p 203-210 doi: 10.1097/FJC.0000000000000195 Buy Metrics Abstract Abstract: Phosphatidylinositol 4,5-bisphosphate hydrolysis at the plasma membrane by phospholipase C is one of the major hormone regulated intracellular signaling systems. The system generates the diffusible second messenger IP3 and the membrane bound messenger diacylglycerol. Spatial regulation of this system has been thought to be through specific subcellular distributions of the IP3 receptor or PKC. As is becoming increasingly apparent, receptor-stimulated signaling systems are also found at intracellular membranes. As discussed in this issue, G protein–coupled receptors have been identified at the nuclear envelope implying intracellular localization of the signaling systems that respond to G protein–coupled receptors. Here, we discuss the evidence for the existence of PLC signals that regulate nuclear processes, as well as the evidence for nuclear and nuclear envelope localization of PLC signaling components, and their implications for cardiac physiology and disease. Copyright © 2015 Wolters Kluwer Health, Inc. All rights reserved.