Catecholamine-induced cardiac hypertrophy: significance of proto-oncogene expression
Abstract
The effect of beta- and alpha-adrenergic stimulation on cardiovascular function and development of cardiac hypertrophy was studied in rats by measuring the heart weight/body weight and cardiac RNA/DNA ratios. Beta-receptor stimulation with isoproterenol over 3 days induced an increase in the biosynthesis of cardiac adenine nucleotides, myocardial protein synthesis, and the heart weight/body weight ratio. The isoproterenol-induced metabolic effects were prevented by simultaneous beta-adrenergic blockade with propranolol. Alpha-adrenergic stimulation with norfenephrine for 3 days induced an increase in heart rate, total peripheral resistance, the myocardial RNA/DNA, and left ventricular weight/body weight ratio. The calcium antagonist verapamil prevented the hemodynamic changes but did not influence the development of cardiac hypertrophy. The alpha-adrenergic blocker prazosin reversed the norfenephrine-induced functional changes and prevented cardiac hypertrophy. Norepinephrine was infused into isolated perfused working rat hearts to elucidate some molecular biological changes that precede the development of cardiac hypertrophy. It increased transiently and sequentially the mRNA of c-fos and c-myc. This enhancement occurred at ab...Continue Reading
Citations
Changes in the Ca2+-activated K+ channels of the coronary artery during left ventricular hypertrophy
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