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- W2337222335 abstract "Experiments were designed to determine the role of the L-arginine pathway in endothelium-dependent relaxations to vasopressin. The effects of L-arginine analogues NG-nitro-L-arginine (L-NNA), NG-nitro-L-arginine methyl ester (L-NAME), and NG-monomethyl-L-arginine (L-NMMA) on basal and vasopressin-induced activity of nitric oxide synthase were studied in isolated canine basilar arteries. Rings with and without endothelium were suspended for isometric tension recording in Krebs-Ringer bicarbonate solution bubbled with 94% O2-6% CO2 (37 degrees C, pH 7.4). Radioimmunoassay was used to determine the level of guanosine 3',5'-cyclic monophosphate (cGMP). All experiments were performed in the presence of indomethacin, a cyclooxygenase inhibitor. L-NAME and L-NMMA caused endothelium-dependent contractions and inhibited basal production of cGMP. In contrast, L-NNA did not affect basal tone or basal production of cGMP. L-Arginine analogues inhibited relaxations to vasopressin but did not affect relaxations to a nitric oxide donor, molsidomine (SIN-1). The effects of L-NNA, L-NAME, and L-NMMA were reversed in the presence of L-arginine. The relaxations to vasopressin were associated with an increase of cGMP levels in the arterial wall. This effect of vasopressin was inhibited in the presence of L-NNA. These studies suggest that the relaxations to vasopressin are mediated by activation of the endothelial L-arginine pathway, leading to increased production of nitric oxide, with subsequent activation of guanylate cyclase in smooth muscle cells. In canine basilar artery, L-NAME and L-NMMA are nonselective inhibitors of both basal and stimulated production of nitric oxide, whereas L-NNA selectively inhibits vasopressin-induced activation of the L-arginine pathway." @default.
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- W2337222335 date "1993-02-01" @default.
- W2337222335 modified "2023-09-28" @default.
- W2337222335 title "Endothelial L-arginine pathway and relaxations to vasopressin in canine basilar artery" @default.
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- W2337222335 doi "https://doi.org/10.1152/ajpheart.1993.264.2.h413" @default.
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