RGS2 is a component of the cellular stress response
Nguyen CH, Zhao PS, Sobiesiak AJ, Chidiac P
Regulator of G protein signaling (RGS) proteins are GTPase accelerating proteins for heterotrimeric G protein alpha-subunits. RGS2 has recently been shown to have additional G protein-independent functions including control of ion channel currents, microtubule polymerization, and protein synthesis. Cellular levels of RGS2 mRNA and protein are upregulated in response to various forms of stress suggesting that it may be a stress-adaptive protein: however, direct evidence to support this notion has remained elusive. In this report, we show that thermal stress upregulates RGS2 expression and this serves to arrest de novo protein synthesis. The latter is an established cellular response to stress. Inhibiting the stress-induced RGS2 upregulation by way of siRNA knockdown diminished the repression of global protein synthesis. The collective results of our study implicate RGS2 upregulation as a cellular mechanism of controlling de novo protein synthesis in response to stress. This work provides greater insight into the stress proteome and the role of RGS2. (C) 2012 Elsevier Inc. All rights reserved.
Keywords:RGS protein;Translation;Protein synthesis;Cellular stress response