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• W2001000107 abstract "The aim of this study was to clarify, using in vitro and in vivo approaches in the rat, the site of mediation of the inhibition of H(2)S induced arterial chemoreceptor stimulation, by hyperoxia and methemoglobinemia. We first determined the ventilatory dose-response curves during intravenous injections of H(2)S. A very high dose of NaHS, i.e. 0.4 μmol (concentration: 800 μM), was needed to stimulate breathing within 1s following i.v. injection. Above this level (and up to 2.4 μmol, with a concentration of 4800 μM), a dose-dependent effect of H(2)S injection was observed. NaHS injection into the thoracic aorta produced the same effect, suggesting that within one circulatory time, H(2)S pulmonary exchange does not dramatically reduce H(2)S concentrations in the arterial blood. The ventilatory response to H(2)S was abolished in the presence of MetHb (12.8%) and was significantly depressed in hyperoxia and, surprisingly, in 10% hypoxia. MetHb per se did not affect the ventilatory response to hypoxia or hyperoxia, but dramatically enhanced the oxidation of H(2)S in vitro, with very fast kinetics. These findings suggest that, the decrease/oxidation of exogenous H(2)S in the blood is the primary effect of MetHb in vivo. In contrast, the in vitro oxidative properties of blood for H(2)S were not affected by the level of [Formula: see text] between 23 and >760 mmHg. This suggests that the inhibition of the ventilatory response to H(2)S by hyperoxia during aortic or venous injection originates within the CB and not in the blood. The implications of these results on the role of endogenous H(2)S in the arterial chemoreflex are discussed." @default.
• W2001000107 created "2016-06-24" @default.
• W2001000107 creator A5056320736 @default.
• W2001000107 creator A5077107031 @default.
• W2001000107 date "2012-05-01" @default.
• W2001000107 modified "2023-09-23" @default.
• W2001000107 title "Inhibitory effects of hyperoxia and methemoglobinemia on H2S induced ventilatory stimulation in the rat" @default.
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• W2001000107 doi "https://doi.org/10.1016/j.resp.2012.03.018" @default.
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