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Hostrup A.,Copenhagen University | Christensen G.L.,Glostrup Hospital | Christensen G.L.,Neurosearch | Christensen G.L.,Laboratory for Molecular Cardiology | And 14 more authors.
Cellular Physiology and Biochemistry | Year: 2012

Angiotensin II (AngII) is a key peptide in cardiovascular homeostasis and is a ligand for the Angiotensin II type 1 and 2 seven transmembrane receptors (AT1R and AT2R). The AT1receptor is a seven-transmembrane (7TM) G protein-coupled receptor (GPCR) mediating the majority of the physiological functions of AngII. The AT1R mediates its effects through both G protein-dependent and independent signaling, which can be separated by functionally selective agonists. In the present study we investigate the effect of AngII and the β-arrestin biased agonist [SII]AngII on ischemia-reperfusion injury in rat hearts. Isolated hearts mounted in a Langendorff perfused rat heart preparations showed that preconditioning with [SII]AngII reduced the infarct size induced by global ischemia from 46±8.4% to 22±3.4%. In contrast, neither preconditioning with AngII nor postconditioning with AngII or [SII]AngII had a protective effect. Together these results demonstrate a cardioprotective effect of simultaneous blockade of G protein signaling and activation of G protein independent signaling through AT1receptors. Copyright © 2012 S. Karger AG, Basel.

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