Abstract
Transient receptor potential vanilloid 4 (TRPV4) is a Ca2+-permeable non-selective cation channel that is involved in the development of neuropathic pain. P2X7 receptor (P2X7) belongs to a class of ATP-gated nonselective cation channels that plays an important role in neuropathic pain. Nevertheless, little is known about the interaction between them for neuropathic pain. In this paper, we investigated role of TRPV4-P2X7 pathway in neuropathic pain. We evaluated the effect of TRPV4-P2X7 pathway on neuropathic pain in a chronic compression of the dorsal root ganglion (DRG) (hereafter termed CCD) model. We analyzed the effect of P2X7 on mechanical and thermal hyperalgesia mediated by TRPV4 in CCD. Furthermore, we assessed the effect of TRPV4 on the expression of P2X7 and the release of IL-1β and IL-6 in DRG after CCD. We found that intraperitoneal injection of TRPV4 agonist GSK-1016790A led to a significant increase of mechanical and thermal hyperalgesia in CCD, which was partially suppressed by P2X7 blockade with antagonist Brilliant Blue G (BBG). Then, we further noticed that GSK-1016790A injection increased the P2X7 expression of CCD, which was decreased by TRPV4 blockade with antagonist RN-1734 and HC-067047. Furthermore, we also discovered that the expressions of IL-1β and IL-6 were upregulated by GSK-1016790A injection but reduced by RN-1734 and HC-067047. Our results provide evidence that P2X7 contributes to development of neuropathic pain mediated by TRPV4 in the CCD model, which may be the basis for treatment of neuropathic pain relief.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Grant No. 81401868, Liping Ning; Grant No. 81502148, Chuanwei Wang), the Shandong Province Medical and Health Science and Technology Development Project (Grant No. 2017WS468, Liang Zhou), and the Teaching reform and research project of undergraduate education in Clinical Medicine College of Shandong University (Grant No. LCJY-72, Shaocan Tang).
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Supplementary file1 (TIF 4963 kb)
Confocal laser scanning micrographs of SGCs showing immunostaining for P2X7 (green; A) and GFAP (red; B) in CCD rats. C. Merged image showed a partial colocalization between P2X7 and GFAP. Scale bars=25um, n = 3 rats in each group.
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Role of TRPV4 antagonist in hyperalgesia of CCD rats. A: Effect of RN-1734 and HC-067047 on CCD-induced mechanical hyperalgesia. B: Effect of RN-1734 and HC-067047 on CCD-induced thermal hyperalgesia. **P < 0.01 compared with sham group. ##P < 0.01 compared with CCD+NS group. n = 6 rats in each group. CCD: chronic compression of the dorsal root ganglion; PWMT: paw withdrawal mechanical threshold; PWTL: paw withdrawal thermal latency.
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Fan, X., Wang, C., Han, J. et al. Role of TRPV4-P2X7 Pathway in Neuropathic Pain in Rats with Chronic Compression of the Dorsal Root Ganglion. Neurochem Res 46, 2143–2153 (2021). https://doi.org/10.1007/s11064-021-03352-8
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DOI: https://doi.org/10.1007/s11064-021-03352-8