PIP: A Critical Regulator of Vascular Ion Channels Hiding in Plain Sight

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 2020 Aug 9

PMID 32764146

Citations 36

Authors

Osama F Harraz

David Hill-Eubanks

Mark T Nelson

Affiliations

Soon will be listed here.

Abstract

The phosphoinositide, phosphatidylinositol 4,5-bisphosphate (PIP), has long been established as a major contributor to intracellular signaling, primarily by virtue of its role as a substrate for phospholipase C (PLC). Signaling by G-protein-coupled receptors triggers PLC-mediated hydrolysis of PIP into inositol 1,4,5-trisphosphate and diacylglycerol, which are well known to modulate vascular ion channel activity. Often overlooked, however, is the role PIP itself plays in this regulation. Although numerous reports have demonstrated that PIP is critical for ion channel regulation, how it impacts vascular function has received scant attention. In this review, we focus on PIP as a regulator of ion channels in smooth muscle cells and endothelial cells-the two major classes of vascular cells. We further address the concerted effects of such regulation on vascular function and blood flow control. We close with a consideration of current knowledge regarding disruption of PIP regulation of vascular ion channels in disease.

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