Abstract
In isolated rat atria, 1 μM bromoacetylalprenololmentane shifted the tension development curve for isoproterenol to the right of the control curve. After a 2 h washout period, no significant recovery of the isoproterenol concentration-response curve had occurred. Pretreatment of rat atrial membranes with 1 μM bromoacetylalprenololmentane resulted in an 83% decrease in the concentration of β-adrenoceptors with no change in the KD value for [125I]iodocyanopindolol binding to the receptors left. The results indicated that bromoacetylalprenololmentane was an irreversible β-blocker.
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