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• W2129129780 endingPage "R1422" @default.
• W2129129780 startingPage "R1412" @default.
• W2129129780 abstract "Hypoxia evokes a regulated decrease in body temperature, a response that has been termed anapyrexia, but the mechanisms involved are poorly understood. Therefore, the present study was undertaken to test the hypothesis that hypoxia-induced anapyrexia results from the activation of cAMP- and cGMP-dependent pathways in the preoptic region (PO). Adult male Wistar rats weighing 230–260 g were used. Body temperature was monitored by biotelemetry, and the levels of cAMP and cGMP were determined in the anteroventral third ventricular region (AV3V), where the PO is located. Using immunohistochemistry, we observed that the PO contains a high density of cAMP- and cGMP-containing cells. Interestingly, hypoxia exposure raised the levels of cAMP and cGMP in the AV3V. Intra-PO microinjection of Rp-cAMPS, an inhibitor of cAMP-dependent protein kinase, attenuated hypoxia-induced anapyrexia. Similarly, intra-PO microinjection of the mixed β-adrenoceptor/serotonin (5-HT 1A ) receptor antagonist propranolol also impaired the drop in body temperature in response to hypoxia. The reduction in body temperature evoked by intra-PO serotonin, but not epinephrine, was blocked by Rp-cAMPS, indicating the involvement of a preoptic serotonin-cAMP pathway in the development of anapyrexia. Moreover, microinjection of N G -monomethyl-l-arginine, an inhibitor of nitric oxide (NO) synthesis, or Rp-cGMPS, an inhibitor of cGMP-dependent protein kinase, into the PO also attenuated hypoxia-induced anapyrexia. In conclusion, the present study supports that hypoxia-induced anapyrexia results from the activation of the serotonin-cAMP and NO-cGMP pathways in the PO." @default.
• W2129129780 created "2016-06-24" @default.
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• W2129129780 creator A5058314246 @default.
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• W2129129780 date "2002-12-01" @default.
• W2129129780 modified "2023-10-15" @default.
• W2129129780 title "A neurochemical mechanism for hypoxia-induced anapyrexia" @default.
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• W2129129780 doi "https://doi.org/10.1152/ajpregu.00328.2002" @default.
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