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J Mol Cell Cardiol. 1999 Apr;31(4):751-60.

Localization of changes in beta-actin expression in remodeled canine myocardium.

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  • 1Cardiovascular Division, Department of Medicine, University of Minnesota School of Medicine, 420 Delaware Street, Minneapolis, MN, 55455, USA.

Abstract

Beta-actin is a cytoskeletal protein that has been implicated as a potentially important mediator of the growth, signaling, migration, and remodeling of cells. Beta-actin is upregulated in remodeling myocardium in response to either pressure or volume overload. The cellular localization of this response has, however, not been determined and is a necessary first step to begin to clarify the role of beta-actin in myocardial remodeling. Here we demonstrate that beta -actin protein was confined primarily to the cardiac interstitium using immunofluorescent and immunohistochemical staining. Furthermore, both staining and immunoblotting showed markedly increased beta-actin protein in myocardium within 24 h of either regional left ventricular damage or chronic volume overload. More importantly, this increase persisted up to 90 days in both models. Double staining showed co-localization of beta-actin protein and von Willebrand factor, a specific endothelial cell marker. These results suggest that increased beta-actin expression predominantly localized in cardiac interstitial cells, including endothelial cells. The increased beta-actin could be due to either proliferation of the interstitial cells or upregulation of the beta-actin gene.

Copyright 1999 Academic Press.

[PubMed - indexed for MEDLINE]
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