RESUMO
Objective To observe effects of warming acupuncture therapy on expressions of IL-6 and SOCS3 in spinal cord in rats with neuropathic pain; To discuss its mechanism for treating neuropathic pain. Methods Experimental rats were randomly divided into: normal group, model group, warming acupuncture and IL-6 group, with 6 rats in each group. Sciatic nerve chronic constriction injury neuralgia model was established in the model group, without intervention. After modeling for 5 days in the warming acupuncture group, "Pishu" and "Shenshu" acupoints were chosen for warming acupuncture therapy for 10 times. After modeling for 5 days in the IL-6 group, IL-6 group was successfully intrathecally injected 3 times with recombinant IL-6. After finishing all experiments, the mechanical pain behavior was measured with electronic Frye fibers. The mRNA levels of IL-6 and SOCS3 and protein concentration of spinal Iba-1were detected with ELISA and RT-PCR analysis. Results Compared with model group, mechanical withdrawal thresholdsin the warm acupuncture group significantly increased, and the content of Iba-1 decreased significantly (P<0.01); The mRNA level of IL-6 decreased significantly (P<0.01), and the mRNA level of SOCS3 significantly increased (P<0.01). Conclusion Warming acupuncture therapy can reduce the pain response in rats with neuropathic pain through inhibiting spinal cord microglial activation, down-regulating the gene expression of lL-6 and up-regulating the gene expression of SOCS3.