Binding and internalization of angiotensin II (AII) were studied on bovine adrenal medullary cells in primary culture. Binding of [125I]AII was reversible, saturable, specific and showed high affinity. AII was found to be internalized by bovine adrenal medullary cells. Monensin increased whereas phenylarsine oxide (PhAsO) decreased the internalization. Excess of unlabelled AII or saralasin could block the internalization, indicating a receptor mediated internalization process. The kinetic analysis indicated that, during the first 4 min, about 25% of the membrane bound ligand was internalized per min and the recycling of internalized ligand and receptor initiated around 4 min.
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