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- W2090433743 abstract "The presence of the angiotensin AT1A-like receptor subtype in the pulmonary artery and AT1B-like receptor subtype in the pulmonary trunk of the rabbit has been reported in two earlier studies. The present study further investigated these receptor subtypes using five other angiotensins (namely angiotensin II, angiotensin III, angiotensin IV, angiotensin-(1–7) and angiotensin-(4–8)). The direct action of the angiotensins on the rabbit pulmonary arterial and trunk sections and the ability of each angiotensin to further contract or relax preconstricted sections of the pulmonary artery and trunk were studied using the organ bath set-up. The effects of angiotensin III on the 3H overflow from re-uptaken [3H]noradrenaline in the electrically-contracted rabbit pulmonary arterial and trunk sections were also studied. The contractile response of the arterial and trunk section had the following rank order potency: angiotensin II > angiotensin III > angiotensin IV. The contractile response to these angiotensins was greatly reduced or absent in the pulmonary trunk. Angiotensin II further contracted the preconstricted arterial and trunk sections. In contrast, angiotensin III further contracted the preconstricted arterial section but relaxed the preconstricted trunk section. Angiotensin IV similarly relaxed the preconstricted trunk section but had minimum effect on the preconstricted arterial section. Angiotensin-(1–7) and angiotensin-(4–8) had no effect on both sections. The actions of the three angiotensins were inhibited by losartan, an AT1-selective antagonist. Indomethacin, a cyclo-oxygenase inhibitor, inhibited the relaxation caused by angiotensin III and angiotensin IV in the trunk section. The effects of angiotensin III on the electrically preconstricted sections of the pulmonary trunk and artery were not accompanied by any significant changes in 3H overflow. The differential responses produced by angiotensin II and its immediate metabolites via two positionally located and functionally opposing receptor subtypes suggest that the pulmonary trunk and artery is not a passive conduit but an important regulator of blood flow from the heart to the lung." @default.
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- W2090433743 date "2000-03-01" @default.
- W2090433743 modified "2023-09-27" @default.
- W2090433743 title "Actions of angiotensin peptides on the rabbit pulmonary artery" @default.
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- W2090433743 doi "https://doi.org/10.1016/s0024-3205(00)00507-5" @default.
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