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• W2025072007 abstract "1 The possible roles of the l-arginine-NO pathway and of guanosine 3′:5′-cyclic monophosphate (cyclic GMP) in regulating the prejunctional release of noradrenaline and neurogenic vasoconstriction were investigated in the perfused rat tail artery. 2 In the presence of Nω-nitro-l-arginine methyl ester (l-NAME; 30 μm), an inhibitor of NO formation, the vasoconstrictor responses to perivascular nerve stimulation (24 pulses at 0.4 Hz, 0.3 ms, 200 mA) and to exogenous noradrenaline (1 μm) were significantly enhanced, whereas the stimulation-evoked tritium overflow from [3H]-noradrenaline preloaded arteries was not modified. The vasoconstriction enhancing effect of l-NAME was prevented by l-arginine (1 mm) but not d-arginine (1 mm) and was abolished by removal of the endothelium. 3 The NO donor, 3-morpholinosydnonimine-N-ethylcarbamide (SIN-1; 0.1–30 μm), and the cyclic GMP phosphodiesterase inhibitor, zaprinast (0.1–30 μm) both induced a concentration-dependent inhibition of the electrical field stimulation-induced vasoconstriction, while atrial natriuretic peptide (ANP; 100 nm) produced only a slight decrease of the vasoconstrictor response. Methylene blue (3μm), a known inhibitor of soluble guanylate cyclase increased the electrical field stimulation-induced vasoconstriction. SIN-1 and methylene blue when administered simultaneously, antagonized each others effect. None of the compounds tested (SIN-1, zaprinast, ANP or methylene blue) had any significant effect on the stimulation-evoked [3H]-noradrenaline overflow. 4 8-Bromo-cyclic GMP, a potent activator of cyclic GMP-dependent protein kinase, markedly and concentration-dependently (3–300 μm) increased [3H]-noradrenaline overflow but decreased field stimulation-induced vasoconstriction. Dibutyryl-cyclic GMP (100 μm), a weak activator of cyclic GMP-dependent protein kinase, affected neither the pre- nor the postjunctional response to electrical field stimulation. 5 These data show that an NO-like substance of endothelial origin, derived from l-arginine, attenuates vasoconstriction in the rat tail artery, whether neurally-induced or evoked by exogenous noradrenaline. Since noradrenaline release was unaltered by compounds modifying NO production, this NO-like compound acted through a postjunctional mechanism. The lack of prejunctional effects of both soluble and membrane-associated guanylate cyclase activators, despite a large effect of 8-bromo-cyclic GMP, suggests that endogenous cyclic GMP production, if present in sympathetic nerves, may not be involved in the regulation of noradrenaline release in the rat tail artery." @default.
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• W2025072007 date "1992-12-01" @default.
• W2025072007 modified "2023-10-18" @default.
• W2025072007 title "Role of the l-arginine-NO pathway and of cyclic GMP in electrical field-induced noradrenaline release and vasoconstriction in the rat tail artery" @default.
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• W2025072007 doi "https://doi.org/10.1111/j.1476-5381.1992.tb13394.x" @default.
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