Excitation-transcription coupling in arterial smooth muscle

Circulation Research
Brian R WamhoffGary K Owens

Abstract

The primary function of the vascular smooth muscle cell (SMC) is contraction for which SMCs express a selective repertoire of genes (eg, SM alpha-actin, SM myosin heavy chain [SMMHC], myocardin) that ultimately define the SMC from other muscle cell types. Moreover, the SMC exhibits extensive phenotypic diversity and plasticity, which play an important role during normal development, repair of vascular injury, and in vascular disease states. Diverse signals modulate ion channel activity in the sarcolemma of SMCs, resulting in altered intracellular calcium (Ca) signaling, activation of multiple intracellular signaling cascades, and SMC contraction or relaxation, a process known as "excitation-contraction coupling" (EC-coupling). Over the past 5 years, exciting new studies have shown that the same signals that regulate EC-coupling in SMCs are also capable of regulating SMC-selective gene expression programs, a new paradigm coined "excitation-transcription coupling" (ET-coupling). This article reviews recent progress in our understanding of the mechanisms by which ET-coupling selectively coordinates the expression of distinct gene subsets in SMCs by disparate transcription factors, including CREB, NFAT, and myocardin, via selective...Continue Reading

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