The involvement of the TRPA1 receptor in a mouse model of sympathetically maintained neuropathic pain.

Published on Jan 15, 2015in European Journal of Pharmacology3.263
· DOI :10.1016/J.EJPHAR.2014.11.039
Francielle de Vargas Pinheiro9
Estimated H-index: 9
(UFSM: Universidade Federal de Santa Maria),
Jardel Gomes Villarinho15
Estimated H-index: 15
(UFSM: Universidade Federal de Santa Maria)
+ 10 AuthorsEunice André20
Estimated H-index: 20
(UFSM: Universidade Federal de Santa Maria)
Abstract Sympathetic fibres maintain some forms of neuropathic pain, but the underlying mechanisms are poorly understood. Therefore, this study investigated the possible involvement of transient receptor potential ankyrin 1 (TRPA1) and the role of the sympathetic nervous system (involved in sympathetically maintained neuropathic pain) in a model of neuropathic pain induced by sciatic nerve chronic constriction injury (CCI) in mice. Systemic injection of the selective TRPA1 antagonist HC-030031 reversed the mechanical and cold allodynia that was induced by sciatic nerve chronic constriction injury (CCI). Nerve injury also sensitised mice to nociception, which was induced by the intraplantar injection of a low dose of the TRPA1 agonist allyl isothiocyanate without changing TRPA1 immunoreactivity in the injected paw. Furthermore, chemical sympathectomy produced by guanethidine largely prevented CCI-induced mechanical and cold allodynia. CCI also induced a norepinephrine-triggered nociception that was inhibited by an α-adrenoceptor antagonist, norepinephrine transporter block and monoamine oxidase inhibition. Finally, the peripheral injection of HC-030031 also largely reduced CCI-induced norepinephrine nociception and mechanical or cold allodynia. Taken together, the present findings reveal a critical role of TRPA1 in mechanical and cold hypersensitivity and norepinephrine hypersensitivity following nerve injury. Finally, our results suggest that TRPA1 antagonism may be useful to treat patients who present sympathetically maintained neuropathic pain.
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