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Essential role of EGFR in cardioprotection and signaling responses to A1 adenosine receptors and ischemic preconditioning

Essential role of EGFR in cardioprotection and signaling responses to A1 adenosine receptors and... Abstract Transactivation of epidermal growth factor receptor (EGFR) may contribute to specific protective responses (e.g. mediated by δ-opioid, bradykinin, or muscarinic receptors). No studies have assessed EGFR involvement in cardioprotection mediated by adenosine receptors (ARs), and the role of EGFR in ischemic preconditioning (IPC) is unclear. We tested EGFR, matrix metalloproteinase (MMP), and heparin-binding EGF (HB-EGF) dependencies of functional protection via A 1 AR agonism or IPC. Pretreatment of mouse hearts with 100 nM of A 1 AR agonist 2-chloro- N 6 -cyclopentyladenosine (CCPA) or IPC (3 × 1.5-min ischemia/2-min reperfusion) substantially improved recovery from 25-min ischemia, reducing left ventricular diastolic dysfunction up to 50% and nearly doubling pressure development and positive change in pressure over time (+dP/d t ). Benefit with both CCPA and IPC was eliminated by inhibitors of EGFR tyrosine kinase (0.3 μM AG1478), MMP (0.3 μM GM6001), or HB-EGF ligand (0.3 ng/ml CRM197), none of which independently altered postischemic outcome. Phosphorylation of myocardial EGFR, Erk1/2, and Akt increased two- to threefold during A 1 AR agonism, with responses blocked by AG1478, GM6001, and CRM197. Studies in HL-1 myocytes confirm A 1 AR-dependent Erk1/2 phosphorylation is negated by AG1478 or GM6001, and reduced with CRM197 (as was Akt activation). These data collectively reveal that A 1 AR- and IPC-mediated functional protection is entirely EGFR and MMP dependent, potentially involving the HB-EGF ligand. Myocardial survival kinase activation (Erk1/2, Akt) by A 1 AR agonism is similarly MMP/HB-EGF/EGFR dependent. Thus MMP-mediated EGFR activation appears essential to cardiac protection and signaling via A 1 ARs and preconditioning. contractile dysfunction epidermal growth factor receptor ischemia-reperfusion kinase signaling matrix metalloproteinase stunning Copyright © 2011 the American Physiological Society http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png AJP - Heart and Circulatory Physiology The American Physiological Society

Essential role of EGFR in cardioprotection and signaling responses to A1 adenosine receptors and ischemic preconditioning

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Publisher
The American Physiological Society
Copyright
Copyright © 2011 the American Physiological Society
ISSN
0363-6135
eISSN
1522-1539
DOI
10.1152/ajpheart.00639.2010
pmid
21460200
Publisher site
See Article on Publisher Site

Abstract

Abstract Transactivation of epidermal growth factor receptor (EGFR) may contribute to specific protective responses (e.g. mediated by δ-opioid, bradykinin, or muscarinic receptors). No studies have assessed EGFR involvement in cardioprotection mediated by adenosine receptors (ARs), and the role of EGFR in ischemic preconditioning (IPC) is unclear. We tested EGFR, matrix metalloproteinase (MMP), and heparin-binding EGF (HB-EGF) dependencies of functional protection via A 1 AR agonism or IPC. Pretreatment of mouse hearts with 100 nM of A 1 AR agonist 2-chloro- N 6 -cyclopentyladenosine (CCPA) or IPC (3 × 1.5-min ischemia/2-min reperfusion) substantially improved recovery from 25-min ischemia, reducing left ventricular diastolic dysfunction up to 50% and nearly doubling pressure development and positive change in pressure over time (+dP/d t ). Benefit with both CCPA and IPC was eliminated by inhibitors of EGFR tyrosine kinase (0.3 μM AG1478), MMP (0.3 μM GM6001), or HB-EGF ligand (0.3 ng/ml CRM197), none of which independently altered postischemic outcome. Phosphorylation of myocardial EGFR, Erk1/2, and Akt increased two- to threefold during A 1 AR agonism, with responses blocked by AG1478, GM6001, and CRM197. Studies in HL-1 myocytes confirm A 1 AR-dependent Erk1/2 phosphorylation is negated by AG1478 or GM6001, and reduced with CRM197 (as was Akt activation). These data collectively reveal that A 1 AR- and IPC-mediated functional protection is entirely EGFR and MMP dependent, potentially involving the HB-EGF ligand. Myocardial survival kinase activation (Erk1/2, Akt) by A 1 AR agonism is similarly MMP/HB-EGF/EGFR dependent. Thus MMP-mediated EGFR activation appears essential to cardiac protection and signaling via A 1 ARs and preconditioning. contractile dysfunction epidermal growth factor receptor ischemia-reperfusion kinase signaling matrix metalloproteinase stunning Copyright © 2011 the American Physiological Society

Journal

AJP - Heart and Circulatory PhysiologyThe American Physiological Society

Published: Jun 1, 2011

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