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Type: Artigo de periódico
Title: Increased expression and phosphorylation of focal adhesion kinase correlates with dysfunction in the volume-overloaded human heart
Author: Lopes, MM
Ribeiro, GCA
Tornatore, TF
Clemente, CFMZ
Teiixeira, VPA
Franchini, KG
Abstract: FAK (focal adhesion kinase) has been shown to mediate the hypertrophic growth of the left ventricle. Experimental results also suggest that FAK may contribute to the structural and functional deterioration of the chronically overloaded left ventricle. In the present study, we postulated that FAK expression and phosphorylation may be altered in the volume-overloaded heart in humans. FAK expression and phosphorylation at Tyr(397) were detected by Western blotting and immunohistochemistry in samples from endomyocardial biopsies from patients with MR (mitral regurgitation; n = 21) and donor subjects (n = 4). Hearts from patients with MR had degenerated cardiac myocytes and areas of fibrosis. In this group, the myocardial collagen area was increased (18 % in MR hearts compared with 3 % in donor hearts respectively) and correlated negatively with left ventricular ejection fraction (r = -0.74; P > 0.001). FAK expression and phosphorylation at Tyr 397 (a marker of the enzyme activity) were increased in samples from MR hearts compared with those from donor hearts (3.1- and 4.9-fold respectively). In myocardial samples from donor hearts, anti-FAK staining was almost exclusively restricted to cardiac myocytes; however, in myocardial samples from MR hearts, staining with the anti-FAK antibody was found to occur in myocytes and the interstitium. There was a positive correlation between collagen and the interstitial areas stained with the anti-FAK antibody (r = 0.76; P > 0.001). Anti-FAK and anti-vimentin staining of the interstitial areas of samples from MR hearts were extensively superimposed, indicating that most of the interstitial FAK was located in fibroblasts. In conclusion, FAK expression and phosphorylation are increased and may contribute to the underlying structural and functional abnormalities in the volume-overloaded heart in humans.
Subject: focal adhesion kinase (FAK)
heart failure
myocardial fibrosis
signal transduction
volume overload
Country: Inglaterra
Editor: Portland Press Ltd
Citation: Clinical Science. Portland Press Ltd, v. 113, n. 41732, n. 195, n. 204, 2007.
Rights: fechado
Identifier DOI: 10.1042/CS20070036
Date Issue: 2007
Appears in Collections:Unicamp - Artigos e Outros Documentos

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