Objective:To study the therapeutic effect of emodin on inflammatory pain induced by complete Freund’s adjuvant (CFA)in mice and its possible molecular mechanism. Methods:CFA was injected subcutaneously on the dorsal side of the right hind paw of C57BL/6 to induce an inflammatory pain model,and emodin solution was injected intraperitoneally for intervention. The pain threshold was evaluated by the von Frey test and the hot plate test. qRT-PCR and ELISA measure the expression of inflammatory cytokines tumor necrosis factor α(TNF -α),interleukin -1β(IL -1β)and interleukin -6(IL -6). Western blot was used to detect the expression of transient receptor potential vanillic acid 1(TRPV1)and transient receptor potential vanillic acid 4(TRPV4)in dorsal root ganglion(DRG). Results:The mechanical pain and thermal pain thresholds of mice in the CFA group were significantly lower than those of the control group(P < 0.05). Emodin treatment significantly increased mechanical pain and thermal pain threshold in mice with induced inflammatory pain(P < 0.05). Compared with the control group,emodin intervention can not only significantly reduce the inflammatory cytokines TNF-α,IL-1β and IL-6 in DRG and serum of mice with CFA inflammatory pain,but also reduce the expression levels of TRPV1 and TRPV4 in DRG(P < 0.05). Conclusion:Emodin relieves CFA-induced inflammatory pain by reducing the content of inflammatory cytokines TNF-α,IL-1β and IL-6 in DRG and serum,and down-regulating the expression of pain- related ion channels TRPV1 and TRPV4 in DRG.
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ZHENG Xiang, WU Zhouquan, FU Guowei, ZHAO Lin, YUN Huifang. Therapeutic effect and mechanism of emodin on CFA induced inflammatory pain in mice[J].,2022,42(10):1364-1370.