电针调控新西兰兔骨关节炎性疼痛及对脊髓IL-17、IL-17R表达的影响

目的 研究电针是否通过抑制脊髓内白细胞介素(IL)-17及IL-17R的表达来调控新西兰兔骨关节炎性疼痛.方法 新西兰兔随机分为假手术组、炎症模型组、假手术+IL-17组、炎症+抗IL-17组、炎症+电针组、炎症+假电针组,每组8只,4％木瓜蛋白酶构建兔骨关节炎模型,IL-17及IL-17抗血清采用椎管内注射,电针组选择电针刺激足三里(30 min,2 Hz连续波,1～2 mA),假电针组采用非穴位刺激,测定兔痛阈,采用实时荧光定量PCR(RT-qPCR)检测兔脊髓组织IL-17、IL-17R的mRNA表达,Western bolt检测IL-17、IL-17R蛋白表达.结果 在构建骨关节炎模型后新西兰兔痛阈显著下降(P＜0.05),椎管注射IL-17后可以显著降低假手术新西兰兔痛阈(P＜0.05),而椎管注射IL-17抗血清后可明显增加骨关节炎模型兔痛阈值.选择足三里电针刺激可显著提升兔痛阈(P＜0.05).骨关节炎模型组IL-17、IL-17R的mRNA及蛋白表达显著增加(P＜0.05),而电针刺激后其表达显著下降(P＜0.05).结论 新西兰兔骨关节炎性疼痛发生可能涉及脊髓IL-17异常表达,而电针可能通过抑制脊髓IL-17、IL-17R的表达来调控骨关节炎性疼痛.

Electroacupuncture regulates pain and its effect on IL-17 and IL-17R expression of spinal cord in New Zealand rabbit with osteoarthritis

Objective To investigate whether electroacupuncture(EA) regulates the pain in New Zealand rabbits with osteo arthritis by inhibiting the IL-17 and IL-17R expression in spinal cord.Methods New Zealand rabbits were randomly divided into the sham operation group,inflammation model group,sham operation+ IL-17 group,inflammation+ IL-17 group,inflammation + EA group and inflammation +sham EA group,8 cases in each group.The rabbit osteoarthritis model was established by using the papaya protease,IL-17 and IL-17 antiserum was injected into the spinal canal,The EA group selected the EA at Zusanli point(30 min,2 Hz continuous wave,1～ 2 mA),the sham EA group adopted the non-acupoint stimulation.Then the pain threshold of rabbits was detected.The mRNA expression of IL-17 and IL-17R in rabbit spinal cord tissue was detected by RT-qPCR and the protein expression was detected by Western-Bolt.Results The rabbit pain threshold was significantly decreased after constructing the New Zealand osteoarthritis model(P＜0.05),and the spinal canal injection of IL-17 could significantly decrease the pain threshold of sham operation New Zealand rabbit(P＜0.05),while the spinal canal injection of IL-17 antiserum could significantly increase the pain threshold of osteoarthritis model rabbit.Selecting EA at Zusanli point could significantly enhance the rabbit pain threshold (P＜0.05).The mRNA and protein expression of IL-17 and IL-17R of the osteoarthritis model group were significantly increased (P＜0.05),while the expressions were significantly decreased after EA stimulation(P＜0.05).Conclusion The pain occurrence of New Zealand rabbit osteoarthritis may involve the IL-17 abnormal expression in spinal cord.EA may regulate the osteoarthritis pain by inhibiting the expression of IL-17 and IL-17R in spinal cord.