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• W2052293044 abstract "We designed experiments to characterize the role of superoxide anions in the mediation of endothelium-dependent contractions 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 levels of cyclic GMP and cyclic AMP. Calcium ionophore A23187 (10(-9) to 10(-6) mol/L) caused concentration-dependent contractions. The removal of endothelium abolished the effect of A23187. Contractions to A23187 were reversed into relaxations in the presence of superoxide dismutase (150 U/mL) or the prostaglandin H2/thromboxane A2 receptor antagonist SQ29548 (10(-6) mol/L). NG-nitro-L-arginine methyl ester (3 x 10(-4) mol/L) augmented contractions to A23187. In rings with endothelium, A23187 (3 x 10(-7) mol/L) significantly increased levels of both cyclic AMP and cyclic GMP. Indomethacin (10(-5) mol/L) inhibited stimulatory effects of A23187 on cyclic AMP production. In contrast, indomethacin augmented A23187-induced production of cyclic GMP. Selective augmentation of cyclic GMP production by indomethacin appears to be due to protection of nitric oxide or a closely related molecule released following translocation of calcium into endothelial cells. Our findings suggest that (1) an increased concentration of calcium in endothelial cells may activate both cyclooxygenase and the L-arginine/nitric oxide pathway, (2) arachidonic acid metabolism via cyclooxygenase is a source of superoxide anions, and (3) superoxide anions may be responsible for impairment of balance between relaxing and contracting factors leading to contraction of underlying smooth muscle cells." @default.
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• W2052293044 date "1994-02-01" @default.
• W2052293044 modified "2023-09-25" @default.
• W2052293044 title "Role of superoxide anions in the mediation of endothelium-dependent contractions." @default.
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• W2052293044 doi "https://doi.org/10.1161/01.hyp.23.2.229" @default.
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