Abstract
The effect of enalapril and angiotensin II on junctional conductance (gj) of isolated rat heart cell pairs was investigated. It was found that enalapril (1 micrograms/ml) increases gj by 106 +/- 3.1% (SEM) (n = 20) within 4 min. The effect of enalapril on gj was not suppressed by propranolol (10(-6) M) or by a cAMP-dependent protein kinase inhibitor. Angiotensin II (1 micrograms/ml) reduced gj by 55%. These observations might indicate that an intrinsic renin-angiotensin system in heart is involved in the control of gj in cardiac muscle.
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