Epigenetic modulation of Wnt signaling contributes to neuropathic pain in rats

Feng,Wei; Teng,Ruynag; Zhao,Yang; Gao,Jie; Chu,Haichen

doi:10.3892/mmr.2015.3972

Epigenetic modulation of Wnt signaling contributes to neuropathic pain in rats

Authors:
- Wei Feng
- Ruynag Teng
- Yang Zhao
- Jie Gao
- Haichen Chu
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Affiliations: Department of Anesthesiology, Affiliated Hospital of Qingdao University, Qingdao, Shandong 266021, P.R. China
Published online on: June 22, 2015 https://doi.org/10.3892/mmr.2015.3972
Pages: 4727-4733

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Abstract

Previous studies have demonstrated that the Wnt/β‑catenin signaling pathway is critical to the induction and maintenance of chronic neuropathic pain caused by peripheral inflammation and nerve damage. Emerging evidence from recent studies suggests that epigenetic mechanisms may also be critical to the pathogenesis of chronic pain. The present study aimed to elucidate the epigenetic mechanisms underlying altered Wnt signaling and their involvement in CCI‑induced neuropathic pain in rat sciatic nerves. The results of the present study demonstrated a significant increase in the expression levels of Wnt3a in the dorsal horn of the rats with CCI. In addition, a significant increase in histone H3 acetylation, and a significant decrease in cytosine methylation in the promoter region of Wnt3a was observed in the dorsal horn of the rats with CCI. Intrathecal application of XAV939, which acts as an inhibitor of Wnt signaling, significantly decreased the expression levels of active β‑catenin, and attenuated the rat behavioral responses to thermal and mechanical pain stimuli. These results suggest that the epigenetic upregulation of Wnt3a in the dorsal horn contributes to the maintenance of pain‑induced behavior in rats with CCI.

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