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pubmed-article:17292806pubmed:abstractTextProdynorphins (PDYNs) from the African clawed frog (Xenopus laevis), originally described as 'proxendorphins', are novel members of the family of opioid-like precursor polypeptides and were recently discovered based on polymerase chain reaction (PCR) isolates from a Xenopus brain cDNA library. This amphibian prodynorphin was found in two isoforms, (Xen)PDYN-A and (Xen)PDYN-B, consisting of 247 and 279 amino acids, respectively. Each prepropeptide contains five potential opioid-like peptides, collectively named xendorphins. One of these, xendorphin B1 ((Xen)PDYN-B sequence 96-111: YGGFIRKPDKYKFLNA), is a hexadecapeptide that displaced [3H]naloxone and the radiolabelled kappa opioid, [3H]dynorphin A (1-17), with nanomolar affinity from rat brain membranes. Using the acetic acid pain test, the present study examined the antinociceptive effects of spinally administered xendorphin B1 in amphibians. Xendorphin B1 produced a long-lasting and dose-dependent antinociceptive effect in the Northern grass frog (Rana pipiens) with an ED50 value of 44.5 nmol/frog. The antinociceptive effects of xendorphin B1 were significantly blocked by pretreatment with the non-selective opioid antagonist, naltrexone. This is the first report of the in vivo characterization of a non-mammalian prodynorphin-derived peptide and suggests that xendorphin peptides may play a role in the modulation of noxious information in vertebrates.lld:pubmed
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pubmed-article:17292806pubmed:articleTitleXendorphin B1, a novel opioid-like peptide determined from a Xenopus laevis brain cDNA library, produces opioid antinociception after spinal administration in amphibians.lld:pubmed
pubmed-article:17292806pubmed:affiliationOklahoma State University-Center for Health Sciences, College of Osteopathic Medicine, Tulsa, OK, USA.lld:pubmed
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