Angiotensin II-stimulated signaling through G proteins and beta-arrestin.

Published

Journal Article

Beta-arrestin, originally identified as a protein that inhibits heterotrimeric guanine nucleotide-binding protein (G protein) coupling to cognate seven-transmembrane receptors [(7TMRs), also known as G protein-coupled receptors (GPCRs)], is currently being appreciated as a positive signaling mediator for various cell surface receptors. Activation of mitogen-activated protein kinases (MAPKs), especially extracellular signal regulated kinases 1 and 2 (ERK1/2), is a hallmark of intracellular signaling resulting from stimulation of various growth factor receptors, as well as 7TMRs. The resulting ERK activity can occur through multiple parallel or converging mechanisms. Using human embryonic kidney 293 (HEK-293) cells as a model system and utilizing RNA interference technology, two distinct pathways of angiotensin II-mediated ERK activation have been uncovered: (i) a G protein-dependent pathway that produces a transient activation of nuclear ERK and (ii) a beta-arrestin-dependent pathway that leads to sustained activation of ERK that is localized to the cytosol and endosomes. The spatial and temporal segregation of ERK activated by G protein and beta-arrestin pathways suggests that the physiological consequences may be different, and thus ligands that selectively stimulate or inhibit one of these pathways may be therapeutically valuable.

Full Text

Duke Authors

Cited Authors

  • Shenoy, SK; Lefkowitz, RJ

Published Date

  • November 22, 2005

Published In

Volume / Issue

  • 2005 / 311

Start / End Page

  • cm14 -

PubMed ID

  • 16304060

Pubmed Central ID

  • 16304060

Electronic International Standard Serial Number (EISSN)

  • 1525-8882

Digital Object Identifier (DOI)

  • 10.1126/stke.3112005cm14

Language

  • eng