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Type: Artigo de periódico
Title: Load-induced focal adhesion kinase activation in the myocardium: role of stretch and contractile activity
Author: Domingos, PP
Fonseca, PM
Nadruz, W
Franchini, KG
Abstract: We investigated the influence of stretch and contractile activity on load-induced activation of focal adhesion kinase (FAK) and extracellular signal-regulated kinase (ERK)1/2 in isolated rat hearts. Increases of diastolic pressure from similar to0 to similar to15 mmHg rapidly increased FAK tyrosine phosphorylation (maximum: 2.3-fold) and binding to c-Src (maximum: 2.8-fold) and Grb2 (maximum: 3.6-fold). This was paralleled by activation (maximum: 2.8-fold) and binding of ERK1/2 to FAK. FAK and ERK1/2 were immunolocalized at sarcolemmal sites of cardiac myocytes and in the nuclei, in the case of ERK1/2. Balloon inflation to raise ventricular pressure in hearts perfused with cardioplegic solution also activated FAK and ERK1/2. However, increases in contractile activity induced by increasing calcium concentration in the perfusate (from 0.5 to 5 mM) did not activate the FAK multicomponent signaling complex or ERK1/2 in the myocardium. These results indicate that stretch rather than contractile activity induces FAK and ERK1/2 activation in the myocardium. In addition, the activation and binding of ERK1/2 to FAK suggest that FAK drives the load-induced activation of ERK1/2.
Subject: cytoskeleton
cell signaling
rat heart
Country: EUA
Editor: Amer Physiological Soc
Citation: American Journal Of Physiology-heart And Circulatory Physiology. Amer Physiological Soc, v. 282, n. 2, n. H556, n. H564, 2002.
Rights: embargo
Date Issue: 2002
Appears in Collections:Unicamp - Artigos e Outros Documentos

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