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Journal of Endocrinology (1998) 156, 389-394       DOI: 10.1677/joe.0.1560389
© 1998 Society for Endocrinology
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Journal of Endocrinology, Vol 156, Issue 2, 389-394
Copyright © 1998 by Society for Endocrinology

Articles

Characterisation of kinin receptors on the human isolated umbilical artery

F Abbas, JK Clayton, KM Marshall, and J Senior


The aim of this study was to determine the kinin responses on human umbilical artery (HUA) and to characterise the kinin receptors present on this tissue. The HUA was found to constrict in response to both the B2 receptor agonist, bradykinin (BK), and the B1 receptor agonist, des-Arg9-BK. The presence of indomethacin (2.79 microM) was found to have no significant effect on the responses to BK and des-Arg9-BK. The presence of the B2 receptor antagonist, HOE-140 (+2.79 microM indomethacin), resulted in a concentration-related rightward displacement of the concentration-effect curves to BK. The antagonism of the constrictor responses to BK by HOE-140 was found to be competitive (pA2 = 7.5). The responses to BK were not significantly affected by the B1 receptor antagonist des-Arg9(leu8)BK. The presence of des-Arg9(leu8)BK (+2.79 microM indomethacin) resulted in a concentration-related rightward displacement of the concentration-effect curve to des-Arg9-BK. The antagonism of the response to des-Arg9-BK by des-Arg9(leu8)BK was found to be competitive (pA2 = 5.9). The responses to des-Arg9-BK were not significantly affected by HOE-140. The results of the present study suggest that the products of the cyclooxygenase pathway are not involved in the kinin constrictor response on HUA and indicate the presence of B1 and B2 receptors on this tissue.


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