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- W2208976714 abstract "The present study was designed to test whether endothelin (ET) A and/or B receptors in the adrenal medulla are functionally involved in ET-1-induced catecholamine (CA) release in anesthetized dogs. ET-1 was locally infused into the gland via the left adrenolumbar artery. Plasma CA in adrenal venous and aortic blood was determined by a high-performance liquid chromatography method. In the control group, the local infusion of ET-1 (0.5 microg, 0.4 microM) resulted in a significant increase in CA output. In the presence of a low dose of BQ-123 (5 microg, 16.4 microM), the ET-1-induced CA response was significantly attenuated by approximately 80%. With a high dose of BQ-123 (50 microg, 164 microM), the CA response was further blocked by approximately 95%. This inhibition was significantly greater than that obtained with the low dose of BQ-123. By contrast, a low dose of BQ-788 (5 microg, 15.1 microM) did not significantly affect the CA response. With a high dose of BQ-788 (50 microg, 151 microM), the CA response was only partially inhibited by approximately 70%. The results indicate that BQ-123 significantly inhibited ET-1-induced adrenal CA release in a dose-dependent manner. With the low doses, the CA response was markedly inhibited by BQ-123 but remained unchanged in the presence of BQ-788. Moreover, the high dose of BQ-123 virtually abolished the CA response, whereas BQ-788 failed to do so within the dose range tested. The present study suggests that the ET(A) receptor may play a predominant role in mediating the ET-1-induced CA secretion in the canine adrenal gland in vivo, although the possible involvement of the ET(B) receptor could not completely be excluded under the present experimental conditions." @default.
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- W2208976714 date "1997-04-01" @default.
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- W2208976714 title "Role of ET(A) and ET(B) receptors in endothelin-1-induced adrenal catecholamine secretion in vivo" @default.
- W2208976714 doi "https://doi.org/10.1152/ajpregu.1997.272.4.r1290" @default.
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