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• W2000027332 abstract "Nociceptin/orphanin FQ (N/OFQ) modulates several biological functions by activating a specific G‐protein coupled receptor (NOP). Few molecules are available that selectively activate or block the NOP receptor. Here we describe the in vitro and in vivo pharmacological profile of a novel NOP receptor ligand, [Nphe 1 ,Arg 14 ,Lys 15 ]N/OFQ‐NH 2 (UFP‐101). UFP‐101 binds to the human recombinant NOP receptor expressed in Chinese hamster ovary (CHO) cells with high affinity (pK i 10.2) and shows more than 3000 fold selectivity over classical opioid receptors. UFP‐101 competitively antagonizes the effects of N/OFQ on GTPγ 35 S binding in CHO hNOP cell membranes (pA 2 9.1) and on cyclic AMP accumulation in CHO hNOP cells (pA 2 7.1), being per se inactive at concentrations up to 10 μ M . In isolated peripheral tissues of mice, rats and guinea‐pigs, and in rat cerebral cortex synaptosomes preloaded with [ 3 H]‐5‐HT, UFP‐101 competitively antagonized the effects of N/OFQ with pA 2 values in the range of 7.3–7.7. In the same preparations, the peptide was inactive alone and did not modify the effects of classical opioid receptor agonists. UFP‐101 is also active in vivo where it prevented the depressant action on locomotor activity and the pronociceptive effect induced by 1 nmol N/OFQ i.c.v. in the mouse. In the tail withdrawal assay, UFP‐101 at 10 nmol produces per se a robust and long lasting antinociceptive effect. UFP‐101 is a novel, potent and selective NOP receptor antagonist which appears to be a useful tool for future investigations of the N/OFQ‐NOP receptor system. British Journal of Pharmacology (2002) 136 , 303–311; doi: 10.1038/sj.bjp.0704706" @default.
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• W2000027332 date "2002-05-01" @default.
• W2000027332 modified "2023-10-18" @default.
• W2000027332 title "[Nphe¹ ,Arg¹⁴ ,Lys¹⁵ ]Nociceptin-NH₂ , a novel potent and selective antagonist of the nociceptin/orphanin FQ receptor" @default.
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• W2000027332 doi "https://doi.org/10.1038/sj.bjp.0704706" @default.
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