Abstract
The effect of bretylium and guanethidine has been studied on the uptake and the spontaneous and reserpine-induced release of [3H]-noradrenaline in the rat heart and in the splenic nerve endings of the cat. Bretylium and guanethidine inhibited the uptake by the heart of circulating [3H]-noradrenaline. Bretylium blocked spontaneous and reserpine-induced release of [3H]-noradrenaline, while guanethidine caused release and partially antagonized the reserpine-induced release. Both compounds produced a transient liberation of [3H]-noradrenaline from splenic nerves, but blocked the release of the [3H]-catechol amine following stimulation of the splenic nerve.
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