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Pulsed Radiofrequency Treatment Enhances Dorsal Root Ganglion Expression of Hyperpolarization-Activated Cyclic Nucleotide-Gated Channels in a Rat Model of Neuropathic Pain

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Abstract

Pulsed radiofrequency (PRF) treatment is a minimally invasive technique with multiple therapeutic applications. Hyperpolarization-activated cyclic nucleotide-gated (HCN) channel mediating Ih may regulate neuropathic pain signaling. This study aimed to determine whether PRF suppresses neuropathic pain by altering HCN channel expression in dorsal root ganglion (DRG) neurons. Male Sprague Dawley rats with sciatic nerve chronic constriction injury (CCI) were randomly assigned to PRF (n = 60) and sham control (n = 60) groups, respectively. On postoperative day 7 (D07), PRF or sham treatment was delivered to the proximal sciatic nerve for 8 min. Behavioral tests were performed before surgery (D0), on D07, and on D1, D7, and D14 after PRF or sham treatment. HCN1 and HCN2 expression levels in the DRG were examined by immunohistochemistry and Western blot. The results showed that thermal hyperalgesia, mechano-allodynia, and mechano-hyperalgesia were lower, and DRG expression levels of HCN1 and HCN2 higher, in the PRF group compared with sham control animals (all P < 0.05 at D14). In conclusion, PRF can upregulate HCN channel expression in the DRG of rats with sciatic nerve CCI. How this regulation of Ih in nociceptive afferents contributes to the suppression of neuropathic pain by PRF remains to be determined.

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Acknowledgments

This study was supported by Peking University People’s Hospital Research and Development Funds.

Conflict of Interest

The authors declare that they have no competing interests.

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Authors and Affiliations

  1. Pain medicine department, Peking University People’s Hospital, No. 11, Xizhimen South Street, Xicheng District, Beijing, 100044, China

    Yiming Liu, Yi Feng & Tingjie Zhang

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  1. Yiming Liu
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  2. Yi Feng
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  3. Tingjie Zhang
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Correspondence to Tingjie Zhang.

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Liu, Y., Feng, Y. & Zhang, T. Pulsed Radiofrequency Treatment Enhances Dorsal Root Ganglion Expression of Hyperpolarization-Activated Cyclic Nucleotide-Gated Channels in a Rat Model of Neuropathic Pain. J Mol Neurosci 57, 97–105 (2015). https://doi.org/10.1007/s12031-015-0582-x

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  • DOI: https://doi.org/10.1007/s12031-015-0582-x

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