Characterization of 5-Hydroxytryptamine Receptors on the Isolated Pig Basilar Artery by Functional and Radioligand Binding Studies

We aimed to clarify responsiveness to angiotensin (Ang) II in the porcine basilar artery and the role of Ang II receptor subtypes by functional, radioligand binding, and cell culture studies. Ang II induced more potent contractions in the proximal part than in the distal part of isolated porcine basilar arteries. The contraction induced by Ang II was inhibited by the Ang II type 1 (AT 1 ) receptor antagonist losartan, but the Ang II type 2 (AT 2 ) receptor antagonist PD123319 enhanced it. After removal of the endothelium, the effect of losartan remained but the effect of PD123319 was abolished. The specific binding site of [ 3 H]Ang II on the smooth muscle membrane was inhibited by losartan, but not by PD123319. Stimulation of angiotensin II increased nitric oxide (NO) production in cultured basilar arterial endothelial cells. This production was inhibited by PD123319 and the NO synthase inhibitor L-N G -nitroarginine. These results suggest that the contraction induced by Ang II might be mediated via the activation of AT 1 receptors on the basilar arterial smooth muscle cells and be modulated via the activation of AT 2 receptors on the endothelial cells, followed by NO production.

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Characterization of 5-Hydroxytryptamine Receptors on the Isolated Pig Basilar Artery by Functional and Radioligand Binding Studies

Cited by 3 publications

References 25 publications

Vasomotor effects of noradrenaline, acetylcholine, histamine, 5-hydroxytryptamine and bradykinin on snake (Trimeresurus flavoviridis) basilar arteries

Vasomotor effects of noradrenaline, acetylcholine, histamine, 5-hydroxytryptamine and bradykinin on snake (Trimeresurus flavoviridis) basilar arteries

Vasomotor effects of noradrenaline, 5-hydroxytryptamine, angiotensin II, bradykinin, histamine, and acetylcholine on the bat (Rhinolophus ferrumequinum) basilar artery

Role of angiotensin II receptor subtypes in porcine basilar artery: Functional, radioligand binding, and cell culture studies

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