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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Focal adhesion kinase is activated and mediates the early hypertrophic response to stretch in cardiac myocytes

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Autor(es):
Torsoni, Adriana S. ; Constancio, Sabata S. ; Nadruz Júnior, Wilson ; Hanks, Steven K. ; Franchini, Kleber G. [5]
Número total de Autores: 5
Tipo de documento: Artigo Científico
Fonte: Circulation Research; v. 93, n. 2, p. 140-147, July 2003.
Área do conhecimento: Ciências da Saúde - Medicina
Assunto(s):Sistema cardiovascular   Miocárdio   Hipertrofia   Mecanotransdução celular   Quinase 1 de adesão focal
Resumo

Previously we reported that the rapid activation of the Fak/Src multicomponent signaling complex mediates load-induced activation of growth and survival signaling pathways in adult rat heart. In this study, we report that 5% to 20% (10-minute) cyclic stretch (1 Hz) of neonatal rat ventricular myocytes (NRVMs) was paralleled by increases of Fak phosphorylation at Tyr-397 (from 1.5- to 2.8-fold), as detected by anti-Fak-pY397 phosphospecific antibody. Moreover, 15% cyclic stretch lasting from 10 to 120 minutes increased Fak phosphorylation at Tyr-397 by 2.5- to 3.5-fold. This activation was accompanied by a dramatic change in Fak localization in NRVMs from densely concentrated in the perinuclear regions in nonstretched cells to aggregates regularly distributed along the myofilaments in stretched cells. Furthermore, a 4-hour cyclic stretch enhanced the activity of an atrial natriuretic factor (ANF) promoter-luciferase reporter gene by 2.7-fold. Disrupting endogenous Fak/Src signaling either by expression of a dominant-negative Fak mutant with phenylalanine substituted for Tyr-397 or by treatment with a c-Src pharmacological inhibitor (PP-2) markedly attenuated stretch-induced Fak activation and clustering at myofilaments and inhibited stretch-induced ANF gene activation. On the other hand, overexpression of wild-type Fak potentiated the stretch-induced Fak phosphorylation but did not enhance either baseline or stretch-induced ANF promoter-luciferase reporter gene activity compared with the responses of nontransfected NRVMs. These findings identify Fak as an important element in the early responses induced by stretch in cardiac myocytes, indicating that it may coordinate the cellular signaling machinery that controls gene expression program associated with load-induced cardiac myocyte hypertrophy. (AU)

Processo FAPESP: 00/05137-4 - Avaliação da expressão localização e função de proteínas sinalizadoras com microscopia confocal
Beneficiário:Sara Teresinha Olalla Saad
Linha de fomento: Auxílio à Pesquisa - Programa Equipamentos Multiusuários
Processo FAPESP: 01/11698-1 - Mecanismos de sinalização celular ativados por sobrecarga mecânica: implicações na hipertrofia e remodelamento miocárdicos
Beneficiário:Kleber Gomes Franchini
Linha de fomento: Auxílio à Pesquisa - Temático