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- W2141741768 abstract "Nociceptin/orphanin FQ (N/OFQ), nocistatin, and prepro-N/OFQ 160-187 (C-peptide) are all derived from the same precursor protein. We examine the pharmacological mechanisms of nocistatin- and C-peptide-induced pronociceptive responses in a novel algogenic-induced nociceptive flexion test in mice. The intraplantar (i.pl.) injection of nocistatin- and C-peptide induced pronociceptive responses in a range of 0.01 to 10 or 1 pmol, respectively, which showed 100- to 1000-fold less potent effects than the N/OFQ. The nociceptive effects of both peptides were not affected by 1-[(3R,4R)-1-cyclooctylmethyl-3-hydroxymethyl-4-piperidyl]-3-ethyl-1,3-dihydro-2H-benzimidazole-2-one (J-113397) (i.pl.), an N/OFQ receptor antagonist, indicating that they are mediated by a novel mechanism independent of activation of N/OFQ receptor. Like N/OFQ, nocistatin-induced nociception was abolished by i.pl. injection of pertussis toxin, phospholipase C inhibitor, or CP-99994, a neurokinin 1 receptor antagonist, indicating that nocistatin may elicit nociception through a substance P release from nociceptor endings via activation of Gi/o and phospholipase C. The nociception was abolished by neonatal pretreatment (s.c.) with capsaicin or by i.t. pretreatment with CP-99994, but not MK-801 (i.t.), an N-methyl-d-aspartate receptor antagonist. In contrast, C-peptide-induced nociception was attenuated by the pretreatment with antisense oligodeoxynucleotide for Galphas (i.t.) and with KT-5720 (i.pl.), a cyclic AMP-dependent protein kinase inhibitor, but not with pertussis toxin. The nociception was neither attenuated by neonatal capsaicin nor by i.t. injection with CP-99994, but it was attenuated by i.t. injection with MK-801. These results suggest that nocistatin and C-peptide derived from prepro-N/OFQ stimulate distinct nociceptive fibers through different in vivo signaling mechanisms." @default.
- W2141741768 created "2016-06-24" @default.
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- W2141741768 date "2003-03-28" @default.
- W2141741768 modified "2023-10-13" @default.
- W2141741768 title "Nocistatin and Prepro-Nociceptin/Orphanin FQ 160–187 Cause Nociception through Activation of G<sub>i/o</sub>in Capsaicin-Sensitive and of G<sub>s</sub>in Capsaicin-Insensitive Nociceptors, Respectively" @default.
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- W2141741768 doi "https://doi.org/10.1124/jpet.103.049361" @default.
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