© 1995 American Heart Association, Inc.
Articles |
Contraction-Induced Cell Wounding and Release of Fibroblast Growth Factor in Heart
From the Departments of Anatomy and Cellular Biology (M.S.F.C., K.M., P.L.M.) and Pharmacology and Toxicology (R.W.C., H.C.), The Medical College of Georgia, Augusta.
Correspondence to Dr Paul L. McNeil, Department of Anatomy and Cellular Biology, The Medical College of Georgia, Augusta, GA 30912-2000.
Abstract The heart hypertrophies in response to certain forms of increased mechanical load, but it is not understood how, at the molecular level, the mechanical stimulus of increased load is transduced into a cell growth response. One possibility is that mechanical stress provokes the release of myocyte-derived autocrine growth factors. Two such candidate growth factors, acidic and basic fibroblast growth factor (aFGF and bFGF, respectively), are released via mechanically induced disruptions of the cell plasma membrane. In the present study, we demonstrate that transient, survivable disruption (wounding) of the cardiac myocyte plasma membrane is a constitutive event in vivo. Frozen sections of normal rat heart were immunostained to reveal the distribution of the wound event marker, serum albumin. Quantitative image analysis of these sections indicated that an average of 25% of the myocytes contained cytosolic serum albumin; ie, this proportion had suffered a plasma membrane wound. Wounding frequency increased approximately threefold after ß-adrenergic stimulation of heart rate and force of contraction. Heparin-Sepharose chromatography, enzyme-linked immunosorbent assay, growth assay coupled with antibody neutralization, and two-dimensional SDS-PAGE followed by immunoblotting were used to demonstrate that both aFGF and bFGF were released from an ex vivo beating rat heart. Importantly, ß-adrenergic stimulation of heart rate and force of contraction increased FGF release. Cell wounding is a fundamental but previously unrecognized aspect of the biology of the cardiac myocyte. We propose that contraction-induced cardiac myocyte wounding releases aFGF and bFGF, which then may act as autocrine growth-promoting stimuli.
Key Words: fibroblast growth factor • myocardium • cell injury • plasma membrane • heart hypertrophy
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