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CCL17 blockade by CCL17mAb/GSK-J4 ameliorates hyperalgesia in a rat model of postoperative pain.
Biological & Pharmaceutical Bulletin 2023 Februrary 16
CCL17 (C-C motif chemokine ligand 17), an important chemokine, plays a vital role in regulating immune balance in the central nervous system. In this study, we explored the potential roles of CCL17 in a rat postoperative pain model and that of blocking CCL17 in the prevention of postoperative pain in rats. A right plantar incision in rat was used as a model of postoperative pain. A behavioral change was measured preoperatively and postoperatively using mechanical withdrawal thresholds and thermal withdrawal latency. CCL17 and its upstream Jmjd-3 mRNA levels in the spinal cord were detected using real-time PCR, CCL17 levels in the serum were measured using ELISA, and the expression of IRF4, which interacts with Jmjd-3, was detected by immunohistochemistry staining. After that, rats were intraperitoneally injected with either anti-CCL17mAb or GSK-J4 (the Jmjd3 inhibitor) to evaluate the protective effects of blocking CCL17 on postoperative pain. We found that CCL17 and Jmjd-3 were significantly increased in the spinal cords of the postoperative pain rat, consistent with changes in hyperalgesia. In addition, our results showed that the mechanical and thermal allodynia was significantly ameliorated using anti-CCL17mAb or GSK-J4. Moreover, we found that anti-CCL17mAb or GSK-J4 treatment decreased c-fos expression in response to peripheral stimulation. Finally, our preliminary exploration found that anti-CCL17mAb or GSK-J4 had a protective effect on tissue damage. These findings indicated that high expression of CCL17 played a critical role in postoperative pain induced by plantar incision and that CCL17 blockade may serve as an effective approach to managing postoperative pain.
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