Binding Sites for Angiotensin II in Human Mononuclear Leucocytes1

Abstract
Angiotensin II binding sites were demonstrated in human mononuclear leucocytes by use of [125I]angiotensin II. The binding of [125I]angiotensin II to mononuclear leucocytes was rapid and reversible. The abilities of unlabeled compounds to displace [125I]angiotensin II were proportional to their abilities to displace labeled hormone in adrenal and smooth muscle membrane preparations. The Scatchard plot revealed two apparent orders of binding sites. The affinity constants were comparable with those for binding sites in other main target tissues of angiotensin II.

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