• Bmc Neurosci · Jun 2016

    The preventive effect of resiniferatoxin on the development of cold hypersensitivity induced by spinal nerve ligation: involvement of TRPM8.

    • Won Uk Koh, Seong-Soo Choi, Ji Hyun Kim, Hye Joo Yoon, Ho-Soo Ahn, Sun Kyung Lee, Jeong Gil Leem, Jun Gol Song, and Jin Woo Shin.
    • Department of Anesthesiology and Pain Medicine, Asan Medical Center, University of Ulsan, College of Medicine, 88 Olympic-ro 43 gil, Songpa-Gu, Seoul, 05505, Korea.
    • Bmc Neurosci. 2016 Jun 21; 17 (1): 38.

    BackgroundResiniferatoxin (RTX) is a potent analog of capsaicin and activates transient receptor potential (TRP) vanilloid type (TRPV) 1. In the current study, we investigated the preventive effect of perineural RTX on the development of cold hypersensitivity induced by spinal nerve ligation (SNL) in rats. Furthermore, we examined the association between the expression level of TRPV1, TRP ankyrin type (TRPA) 1 and TRP melastatin type (TRPM) 8 in the dorsal root ganglion (DRG) and cold hypersensitivity after SNL.ResultsRTX pretreatment prevented the development of SNL-induced hypersensitivity to mechanical, thermal, and cold stimuli. Western blot analysis 4 weeks after RTX pretreatment showed that RTX pretreatment decreased the protein expression level of SNL-induced TRPM8, but not TRPV1 or TRPA1, in the DRG of SNL rats. Immunofluorescent analysis revealed that up-regulated TRPM8-stained neurons after SNL co-localized with neurofilament 200-positive neurons located in the DRG.ConclusionsPretreatment with perineural RTX significantly inhibits SNL-induced mechanical, thermal, and cold hypersensitivity. The antinociceptive effect of perineural RTX, especially on cold hypersensitivity, may be related to the suppression of TRPM8 expression in DRG.

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