Neurotropin® relieves oxaliplatin-induced neuropathy via Gi protein-coupled receptors in the monoaminergic descending pain inhibitory system |
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Authors: | Ken Masuguchi Hitomi WatanabeTakehiro Kawashiri Soichiro UshioNana Ozawa Haruka MoritaRyozo Oishi Nobuaki Egashira |
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Institution: | Department of Pharmacy, Kyushu University Hospital, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan |
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Abstract: | AimsOxaliplatin is a key drug in the treatment of colorectal cancer, but it causes acute and chronic peripheral neuropathies. We previously reported that repeated administration of neurotropin prevents oxaliplatin-induced mechanical allodynia by inhibiting axonal degeneration in rats. In the present study, we investigated the analgesic effect of a single administration of neurotropin on oxaliplatin-induced neuropathy in rats.Main methodsOxaliplatin (4 mg/kg) was administered intraperitoneally twice a week for 4 weeks. Cold hyperalgesia was assessed using the acetone test and mechanical allodynia was evaluated using the von Frey test.Key findingsRepeated injection of oxaliplatin induced cold hyperalgesia on day 5 and mechanical allodynia on day 28. A single administration of neurotropin transiently relieved both pain behaviors. The analgesic effect of neurotropin was inhibited by pretreatment with 5-HT1A, 5-HT2, 5-HT3, and α2 receptor antagonists and by monoamine depletion. Moreover, the analgesic effect of neurotropin was abolished by intrathecal injection of pertussis toxin, a Gi protein inhibitor.SignificanceThese results suggest that neurotropin is effective in relieving oxaliplatin-induced neuropathy, and that Gi protein-coupled receptors in the monoaminergic descending pain inhibitory system may be involved in the analgesic effect of neurotropin. Neurotropin may have clinical potential for the treatment of oxaliplatin-induced neuropathies. |
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Keywords: | Oxaliplatin (PubChem CID: 5310940) Prazosin (PubChem CID: 4893) Yohimbine (PubChem CID: 8969) WAY100635 (PubChem CID: 5684) Ketanserin (PubChem CID: 3822) 6-Hydroxydopamine (PubChem CID: 4624) p-Chlorophenylalanine (PubChem CID: 26229) |
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