Referenced in: none

Automatically associated channels: TRP , TRPA , TRPA1

Title: The role of transient receptor potential A 1 (TRPA1) in the development and maintenance of carrageenan-induced hyperalgesia.

Authors: Ivan J M Bonet, Luana Fischer, Carlos Amílcar Parada, Claudia H Tambeli

Journal, date & volume: Neuropharmacology, 2013 Feb , 65, 206-12

PubMed link: http://www.ncbi.nlm.nih.gov/pubmed/23098993

Abstract
Transient receptor potential ankyrin 1 (TRPA1) is a nonselective cation channel important in setting nociceptive threshold. It is expressed in nociceptive C-fibers and in non-neuronal cells involved in pro-inflammatory mediators' release. We asked whether TRPA1 contributes to carrageenan-induced hyperalgesia in rats, and if so, whether this contribution is mediated by mechanisms involved in inflammation such as cytokine release and neutrophil migration and/or by a direct sensitization of the primary afferent nociceptors. Pharmacological blockade of local TRPA1 by its selective antagonist HC 030031 prevented and reversed carrageenan-induced hyperalgesia, which was detected either by a mechanical or chemical (low dose of capsaicin) stimulus. However, it did not affect either carrageenan-induced cytokines expression or neutrophil migration. The neuronal TRPA1 gene silencing induced by intrathecal pre-treatment with antisense oligodoexynucleotide completely prevented carrageenan-induced hyperalgesia over 24 h and significantly reduced TRPA1 expression in the dorsal root ganglia cells (L5-6), which was not affected by carrageenan treatment. We conclude that TRPA1 plays an important role in the development and maintenance of carrageenan-induced inflammatory hyperalgesia by directly contributing to nociceptor excitability.