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Proceedings: Inhibition of accumulation of adrenaline and noradrenaline in arterial smooth muscle by steroids.

Steroid hormones potentiate the response of arterial smooth muscle to catecholamines (Kalsner, 1969a, b). It is possible that in arteries, where few smooth muscle cells are in close proximity to adrenergic nerves, extraneuronal accumulation and metabolism of noradrenaline may serve as an important route of inactivation (Lightman & Iversen, 1969). A steroid-induced inhibition of Uptake2 in the rat heart has been demonstrated (Iversen & Salt, 1970). The present experiments were undertaken to assess directly the effect of steroids on the accumulation of adrenaline and noradrenaline in arterial smooth muscle.