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Nociceptin/orphanin FQ (N/OFQ), an endogenous agonist of the opioid N/OFQ (NOP) receptor, increases food intake when administered centrally. As N/OFQ is part of a larger neural network that governs consummatory behavior, presumably its orexigenic properties stem from interplay with other neuropeptidergic components of the feeding-related circuitry. One such peptide may be the ligand of the melanocortin-3...
The paraventricular hypothalamic nucleus (PVN) appears to integrate orexigenic properties of a novel peptide, ghrelin. Thus, we examined central mechanisms underlying feeding generated by intra-PVN ghrelin. We established that 0.03nmol of PVN-injected ghrelin was the lowest dose increasing food consumption and it induced c-Fos immunoreactivity (a marker of neuronal activation) in the PVN itself, as...
Nociceptin/orphanin FQ (N/OFQ) is an endogenous ligand of the ORL1 receptor. N/OFQ, when administered centrally, stimulates feeding in a fashion similar to other opioids. Intracerebroventricular administration of N/OFQ induces changes in c-Fos immunoreactivity in several feeding-related brain sites. A synthetic pseudopeptide, [Phe 1 ι(CH 2 -NH)Gly 2 ]-nociceptin(1-13)-NH ...
Nocistatin, a product of the same precursor as nociceptin/orphanin FQ (N/OFQ), has been shown to antagonize effects of N/OFQ. N/OFQ stimulates feeding, most probably by inhibiting activation of neurons containing oxytocin (OT) and vasopressin (VP), peptides considered as satiety factors, and implicated in the development of conditioned taste aversion (CTA). The present study was designed to investigate...
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