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- W2012952384 abstract "Evidence indicates that endogenous opioids play a role in body temperature (Tb) regulation in mammals but no data exist about the involvement of the specific opioid receptors, mu, kappa and delta, in the reduction of Tb induced by hypoxia. Thus, we investigated the participation of these opioid receptors in the anteroventral preoptic region (AVPO) in hypoxic decrease of Tb. To this end, Tb of unanesthetized Wistar rats was monitored by temperature data loggers before and after intra-AVPO microinjection of the selective kappa-opioid receptor antagonist nor-binaltorphimine dihydrochloride (nor-BNI; 0.1 and 1.0 microg/100 nL/animal), the selective mu-opioid receptor antagonist D-Phe-Cys-Tyr-D-Trp-Arg-Thr-Pen-Thr-NH2 cyclic (CTAP; 0.1 and 1.0 microg/100 nL/animal), and the selective delta-opioid receptor antagonist Naltrindole (0.06 and 0.6 microg/100 nL/animal) or saline (vehicle, 100 nL/animal), during normoxia and hypoxia (7% inspired O2). Under normoxia, no effect of opioid antagonists on Tb was observed. Hypoxia induced Tb to reduce in vehicle group, a response that was inhibited by the microinjection intra-AVPO of nor-BNI. In contrast, CTAP and Naltrindole did not change Tb during hypoxia but caused a longer latency for the return of Tb to the normoxic values just after low O2 exposure. Our results indicate the kappa-opioid receptor in the AVPO is important for the reduction of Tb during hypoxia while the mu and delta receptors are involved in the increase of Tb during normoxia post-hypoxia." @default.
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- W2012952384 date "2009-08-01" @default.
- W2012952384 modified "2023-10-16" @default.
- W2012952384 title "Role of preoptic opioid receptors in the body temperature reduction during hypoxia" @default.
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- W2012952384 doi "https://doi.org/10.1016/j.brainres.2009.06.039" @default.
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