Literature DB >> 21239110

Role of peripheral 5-HT(4), 5-HT(6), and 5-HT(7) receptors in development and maintenance of secondary mechanical allodynia and hyperalgesia.

Beatriz Godínez-Chaparro1, Paulino Barragán-Iglesias, Gabriela Castañeda-Corral, Héctor I Rocha-González, Vinicio Granados-Soto.   

Abstract

The role of 5-hydroxytryptamine (5-HT)(4), 5-HT(6), and 5-HT(7) receptors in formalin-induced secondary allodynia and hyperalgesia in rats was assessed. Formalin produced acute nociceptive behaviors (flinching and licking/lifting) followed by long-term secondary mechanical allodynia and hyperalgesia. Pretreatment (-10min) with cromoglycate (195-1950nmol/paw) partially inhibited acute nociceptive behaviors and completely prevented secondary allodynia and hyperalgesia on day 6 after injection. Ipsilateral peripheral pretreatment with the selective 5-HT(4) (ML-10302, 1-100nmol/paw), 5-HT(6) (EMD-386088, 0.001-0.01nmol/paw), and 5-HT(7) (LP-12, 0.01-100nmol/paw) receptor agonists significantly increased secondary allodynia and hyperalgesia in both paws. In contrast, ipsilateral peripheral pretreatment with the selective 5-HT(4) (GR-125487, 1-100nmol/paw), 5-HT(6) (SB-258585, 0.00001-0.001nmol/paw), and 5-HT(7) (SB-269970, 0.1-10nmol/paw) receptor antagonists significantly prevented formalin-induced secondary allodynia and hyperalgesia in both paws. The pronociceptive effect of ML-10302 (100nmol/paw), EMD-386088 (0.01nmol/paw), and LP-12 (100nmol/paw) were completely prevented by GR-125487 (5-HT(4) antagonist, 1nmol/paw), SB-258585 (5-HT(6) antagonist, 0.00001nmol/paw), and SB-269970 (5-HT(7), antagonist, 0.01nmol/paw), respectively. Ipsilateral peripheral posttreatment with cromoglycate or GR-125487 (1-100nmol/paw), SB-258585 (0.001-0.1nmol/paw), and SB-269970 (0.1-10nmol/paw) reversed formalin-induced secondary allodynia and hyperalgesia in both paws. Results suggest that a barrage of afferent input induced by 5-HT at peripheral 5-HT(4), 5-HT(6), and 5-HT(7) receptors participate in the development and maintenance of formalin-induced long-term secondary allodynia and hyperalgesia in the rat. 5-hydroxytryptamine (5-HT) released in peripheral tissues after formalin injection sensitized primary afferent neurons via 5-HT(4), 5-HT(6), and 5-HT(7) receptors, leading to development and maintenance of secondary allodynia and hyperalgesia.
Copyright © 2010 International Association for the Study of Pain. Published by Elsevier B.V. All rights reserved.

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Year:  2011        PMID： 21239110     DOI： 10.1016/j.pain.2010.12.020

Source DB:  PubMed          Journal:  Pain        ISSN： 0304-3959            Impact factor:   6.961


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