Abstract
An alternative angiotensin II-forming system distinct from the vascular renin-angiotensin system was demonstrated using a rat hindlimb perfusion system and synthetic substrates. This pathway was resistant to captopril and aprotinin, but was highly sensitive to chymostatin. Moreover, angiotensin II formation was substrate-dependent, i.e. angiotensin II formation from tridecapeptide human renin substrate in the presence of captopril was more than twice that that from an equimolar amount of angiotensin I. Both pathways may play a role in regulating the peripheral circulation.
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