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• W2031343588 abstract "Forebrain injections of nociceptin/orphanin FQ (N/OFQ), the endogenous ligand of the NOP opioid receptor, previously referred to as ORL1 or OP4 receptor, stimulate feeding in freely feeding rats, while the NOP receptor antagonist [Nphe(1)]N/OFQ(1-13)NH(2) inhibits food deprivation-induced feeding. To further evaluate whether the N/OFQ-NOP receptor system plays a physiological role in feeding control, the present study evaluated forebrain mRNA levels for the N/OFQ precursor (pro-N/OFQ), as well as for the NOP receptor in food deprived rats. The results obtained show that food deprived rats have lower mRNA levels for the NOP receptor in several forebrain regions; a significant reduction was found in the paraventricular and lateral hypothalamic nuclei and in the central nucleus of the amygdala. Food deprived rats also exhibited lower pro-N/OFQ mRNA levels in the central amygdala. These results suggest that the N/OFQ-NOP receptor system may have a physiological role in feeding control. The observation that food deprivation reduces gene expression of the N/OFQ-NOP receptor system is apparently not consistent with a direct hyperphagic action for N/OFQ. Taking into account that N/OFQ exerts inhibitory actions at cellular level, the present results may be in keeping with the hypothesis that N/OFQ stimulates feeding by inhibiting neurons inhibitory for food intake; under conditions of food deprivation, these neurons may be silent and the N/OFQ-NOP receptor system, which controls them, may also be regulated at a lower level. Consistently, in the present study N/OFQ stimulated food intake in freely feeding rats, but did not further increase feeding in food deprived rats." @default.
• W2031343588 created "2016-06-24" @default.
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• W2031343588 date "2002-12-01" @default.
• W2031343588 modified "2023-10-16" @default.
• W2031343588 title "Pro-nociceptin/orphanin FQ and NOP receptor mRNA levels in the forebrain of food deprived rats" @default.
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• W2031343588 doi "https://doi.org/10.1016/s0006-8993(02)03678-8" @default.
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