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- W2034705245 abstract "1 The pharmacological profiles of presynaptic nociceptin/orphanin FQ (N/OFQ) peptide receptors (NOP) modulating 5-hydroxytryptamine (5-HT) and noradrenaline (NE) release in the rat neocortex were characterized in a preparation of superfused synaptosomes challenged with 10 mM KCl. 2 N/OFQ concentration-dependently inhibited K(+)-evoked [(3)H]-5-HT and [(3)H]-NE overflow with similar potency (pEC(50) approximately 7.9 and approximately 7.7, respectively) and efficacy (maximal inhibition approximately 40%). 3 N/OFQ (0.1 micro M) inhibition of [(3)H]-5-HT and [(3)H]-NE overflow was antagonized by selective NOP receptor antagonists of peptide ([Nphe(1)]N/OFQ(1-13)NH(2) and UFP-101; 10 and 1 microM, respectively) and non-peptide (J-113397 and JTC-801; both 0.1 microM) nature. Antagonists were routinely applied 3 min before N/OFQ. However, a 21 min pre-application time was necessary for J-113397 and JTC-801 to prevent N/OFQ inhibition of [(3)H]-NE overflow. 4 The NOP receptor ligand [Phe(1)psi(CH(2)-NH)Gly(2)]N/OFQ(1-13)NH(2) ([F/G]N/OFQ(1-13)NH(2); 3 microM) did not affect K(+)-evoked [(3)H]-NE but inhibited K(+)-evoked [(3)H]-5-HT overflow in a UFP-101 sensitive manner. [F/G]N/OFQ(1-13)NH(2) antagonized N/OFQ actions on both neurotransmitters. 5 The time-dependency of JTC-801 action was studied in CHO cells expressing human NOP receptors. N/OFQ inhibited forskolin-stimulated cAMP accumulation and JTC-801, tested at different concentrations (0.1-10 microM) and pre-incubation times (0, 40 and 90 min), antagonized this effect in a time-dependent manner. The Schild-type analysis excluded a competitive type of antagonism. 6 We conclude that presynaptic NO receptors inhibiting 5-HT and NE release in the rat neocortex have similar pharmacological profiles. Nevertheless, they can be differentiated pharmacologically on the basis of responsiveness to [F/G]N/OFQ(1-13)NH(2) and time-dependent sensitivity towards non-peptide antagonists." @default.
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- W2034705245 date "2003-01-01" @default.
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- W2034705245 title "Pharmacological profiles of presynaptic nociceptin/orphanin FQ receptors modulating 5-hydroxytryptamine and noradrenaline release in the rat neocortex" @default.
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- W2034705245 doi "https://doi.org/10.1038/sj.bjp.0705005" @default.
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