[Effect of isadrine and propranolol on the membrane potential of mammary secretory cells].

1.10(-7)--1.10(-5) g/ml of isadrine induced a 2-phase hyperpolarization changes of MP of the secretory cell. Propranolol (1.10(-6) g/ml) decreased the amplitude of hyperpolarization response of the MP to oxytocin by 36%; 1.10(-9)--1.10(-8) g/ml of isadrine induced a 42% and 53% decrease respectively, and 1.10(-7)--1.10(-5) g/ml blocked the response of secretory cells to oxytocin. The data obtained suggest that catecholamines can effect the MP by means of interaction with beta-adrenoreceptors of mammary secretory cells.