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Effect of angiotensin on noradrenaline-3H accumulation and synthesis in vivo.

The effect of slow intravenous infusion of angiotensin (0.017, 0.17, and 1.7 μg/min/100 g) on the endogenous noradrenaline (NA) level and on the accumulation and synthesis of NA-3H was studied in rat heart, spleen, and aorta. No significant changes in endogenous NA level were observed in rat aorta and heart after infusion of angiotensin for 1 h. In the spleen, only, a statistically significant lowering of NA was observed with 0.17 and 1.7 μg/min/100 g of angiotensin. The entry of NA-3H into nerve terminals was not affected by angiotensin, but the retention of the amine in a nonmetabolized state was significantly reduced. The angiotensin action varied from one organ to another, reflecting the differences in their capacity to accumulate and metabolize NA. Angiotensin potentiated the inhibitory effect of desmethylimipramine and ouabain on NA accumulation. The incorporation of tyrosine-3H into adrenergic nerves was not blocked by angiotensin infusion, while the amount of newly sythesized catecholamines-3H was...