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(Hypertension. 2002;39:756.)
© 2002 American Heart Association, Inc.

Scientific Contributions

Aldosterone and D-Glucose Stimulate the Proliferation of Human Cardiac Myofibroblasts In Vitro

Susanne Neumann; Klaus Huse; Robert Semrau; Anno Diegeler; Rolf Gebhardt; Gayane Hrachia Buniatian; Gerhard H. Scholz

From the Department of Internal Medicine II (S.N.) and III (G.H.S.), Department of Heart and Cardiovascular Surgery (A.D.), Institute of Biochemistry (G.H.B., R.G.), University of Leipzig, Germany; and Institute of Molecular Biotechnology (K.H.) and Department of Radiation Oncology, University of Cologne (R.S.), Cologne, Germany.

Correspondence to Gerhard H. Scholz, Department of Internal Medicine III, University of Leipzig, Ph.-Rosenthal-Str.27, 04103 Leipzig, Germany. E-mail schog{at}medizin.uni-leipzig.de

The renin-angiotensin-aldosterone-system appears to be involved in the development of cardiac fibrosis in rodents, characterized by nonepithelial cell proliferation and changes in the extracellular matrix. The aim of our study was to investigate the effect of high aldosterone concentrations on the proliferation of human cardiac interstitial cells in vitro. In addition, the effect of D-glucose as another risk factor for fibrosis, eg, in the diabetic heart, was investigated. Human cardiac myofibroblast cultures were established, and growth rates were measured by WST-1 assay in fetal calf serum-free Dulbecco’s modified Eagle’s medium (DMEM). Cells in culture showed a significant increase in number between 24 to 72 hours of cultivation under basal conditions (DMEM, 10% fetal calf serum). Aldosterone at high concentrations (10^-8 and 10^-7 mol/L) significantly (P<0.01) increased the proliferation of cultured cardiac myofibroblasts. Comparable effects were observed after incubation of the cells with high D-glucose concentrations (15 and 25 mmol/L, P<0.01). No additive growth stimulation was evident when the cells were incubated in medium containing both aldosterone and D -glucose. These results suggest a role for aldosterone and glucose in mediating the cardiac fibrosis through stimulation of myofibroblast growth in patients with dysregulated renin-angiotensin-aldosterone-system (especially hyperaldosteronism) and impaired glucose homeostasis.

Key Words: aldosterone • glucose • cardiac myofibroblasts • human

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