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- W2019922765 abstract "Previously we showed that prolonged exposure to severe hypoxia produces decreased peripheral chemoreceptor responsiveness to hypoxia and attenuates central nervous system (CNS) chemosensory translation, which together may contribute to the decreased hypoxic ventilatory response (HVR) in chronic hypoxia. In this study, we sought to determine whether the central or peripheral activity of endogenous dopamine modulates this decreased HVR. We examined the effects of peripheral and central dopamine receptor blockade on HVR and carotid sinus nerve (CNS) response to hypoxia in controls and in cats exposed to a simulated altitude of 5500 m for 3 weeks. Domperidone increased CSN response to hypoxia in hypoxic cats to levels similar to those observed in controls. HVR was also augmented by domperidone in hypoxic cats, but remained below that of controls. As a result, the CNS chemosensory translation remained reduced in hypoxic animals. We further treated animals with haloperidol. However, this combined treatment with domperidone and haloperidol led to no further increase in CSN or ventilatory responses to hypoxia, or in CNS chemosensory translation in hypoxic cats. Thus, decreased HVR in hypoxic cats is mediated both by depression of hypoxic sensitivity of the carotid body, which is largely dopaminergic, and by decreased CNS chemosensory translation which must involve non-dopaminergic mechanisms." @default.
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- W2019922765 date "1995-07-01" @default.
- W2019922765 modified "2023-09-23" @default.
- W2019922765 title "Decreased carotid body hypoxic sensitivity in chronic hypoxia: role of dopamine" @default.
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- W2019922765 doi "https://doi.org/10.1016/0034-5687(95)00012-3" @default.
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