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Angiotensin II and Angiotensin III in Rat Blood

Angiotensin II and its metabolites, [des-Asp1]-angiotensin II (angiotensin III), [des-(Asp1,Arg2)]angiotensin II, and [des-(Asp1, Arg2, Val3)]angiotensin II, were measured in arterial and venous plasma from normal rats. Paper chromatography was used to separate the peptides which were measured with a radioimmunoassay method using an angiotensin II antiserum which had a 100% cross-reaction with each of these metabolites. A mean of 33% of the immunoreactive material in arterial plasma was angiotensin II, 58% angiotensin HI, and 9% [des-(Asp1, Arg2)]angiotensin II/[des-(Asp1, Arg2,Val3)]angiotensin II. A similar distribution was found in venous plasma. This and other evidence indicates that angiotensin-induced aldosterone secretion in the rat, unlike that in other mammalian species so far studied, may be mediated by angiotensin III.