The contractile effects of porcine tetradecapeptide renin substrate in human resistance vesselsevidence of activation by vascular wall renin and serine proteases
作者:
Stuart Bund,
Christian Aalkjaer,
Anthony Heagerty,
Brenda Leckie,
Anthony Lever,
期刊:
Journal of Hypertension
(OVID Available online 1989)
卷期:
Volume 7,
issue 9
页码: 741-746
ISSN:0263-6352
年代: 1989
出版商: OVID
关键词: Human resistance vessel;vascular renin;tetradecapeptide renin substrate;serine protease
数据来源: OVID
摘要:
In order to test the hypothesis that the contraction induced in human resistance arterioles by porcine tetradecapeptide renin substrate (TDP) is mediated by enzymes specific to the renin–angiotensin cascade, human resistance vessels from skin and subcutaneous fat were mounted in a myograph and exposed to TDP in the presence and absence of the human renin inhibitor H261, the serine protease inhibitor aprotinin, a polyclonal anti-human renin antibody and captopril. TDP induced a dose-dependent contraction that could be abolished by saralasin. The sensitivity to TDP was significantly attenuated by H261, aprotinin and combinations of captopril with aprotinin and captopril plus aprotinin and H261, as indicated by a significant reduction in pD2(-log10ED50[mmol/l]) for TDP. However, captopril alone was ineffective. It was concluded that at physiological pH, porcine TDP induces contraction in human resistance vessels by the action of enzymes not specific to the renin–angiotensin cascade. Whilst a clear inhibitory effect of H261 was demonstrated, a significant comparable inhibition by captopril and a polyclonal renin antibody was not observed. This may reflect the difficulty with which these inhibitors gain access to their intracellularry located substrates.
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