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.
journal_name
Painjournal_title
Painauthors
Godínez-Chaparro B,Barragán-Iglesias P,Castañeda-Corral G,Rocha-González HI,Granados-Soto Vdoi
10.1016/j.pain.2010.12.020subject
Has Abstractpub_date
2011-03-01 00:00:00pages
687-697issue
3eissn
0304-3959issn
1872-6623pii
00006396-201103000-00032journal_volume
152pub_type
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