电针“足三里”“三阴交”穴对胶原性关节炎大鼠滑膜细胞分泌功能的影响

目的:观察电针"足三里"三阴交"对胶原性关节炎(collagen-induced arthritis,CIA)大鼠的治疗作用,并探讨该疗法调节CIA大鼠滑膜细胞分泌功能的部分机制。方法:36只Wistar大鼠随机分为正常对照组、模型对照组和电针治疗组。模型对照组和电针治疗组采用牛Ⅱ型胶原在大鼠背部正中线作多点皮内注射诱发CIA模型。电针治疗组选取"足三里"三阴交"穴进行电针刺激,频率2Hz,强度2mA,时间30min,连续治疗30d。处理前后分别观察CIA大鼠足跖肿胀度、痛阈;采用ELISA法检测大鼠膝关节滑膜细胞培养上清液中前列腺素E2(PGE2)、肿瘤坏死因子-α(TNF-α)、白介素-1β(IL-1β)水平。结果:模型对照组大鼠足跖肿胀度,滑膜细胞培养上清中PGE2浓度和TNF-α、IL-1β含量均高于正常对照组大鼠,差异有统计学意义(P<0.05,P<0.01),痛阈低于正常对照组大鼠,差异有统计学意义(P<0.05)。与模型对照组比较,电针治疗组大鼠足跖肿胀度减小,痛阈升高,关节滑膜细胞培养上清中PGE2浓度下降,TNF-α和IL-1β含量降低,差异有统计学意义(P<0.05)。结论:电针"足三里"三阴交"穴对胶原性关节炎大鼠具有良好的治疗作用,该作用可能与抑制关节滑膜细胞的分泌功能有关。

Effect of Electroacupuncture at "Zusanli"(ST 36)and "Sanyinjiao"(SP 6)on Collagen-induced Arthritis and Secretory Function of Knee-joint Synoviocytes in Rats

Objective To observe the effect of electroacupuncture (EA) of "Zusanli" (ST 36) and "Sanyinjiao" (SP 6) on collagen-induced arthritis (CIA) and its underlying mechanism in regulating the secretory function of knee-joint synovial cells in CIA rats. Methods Thirty-six Wistar rats were equally randomized into control, model and EA groups. CIA model (rheumatoid arthritis) was duplicated by intradermal injection of Bovine type E collagen into the back of the anesthetized rats. EA (2 Hz, 2 mA) was applied to "Zusanli" (ST 36) and "Sanyinjiao" (SP 6) for 30 min, once a day for 30 days. The paw volume was measured by using a Plethysmometer and hot water tail-flick tests (50 ℃ ) were conducted for detecting the rats' pain threshold (PT) before and after the treatment. The contents of PGE_2, IL-1β and TNF-α in supernatant of the cultured joint synoviocytes were detected by enzyme linked immunosorbent assay (ELISA). Results In comparison with control group, the swelled paw volume, the declined PT, PGE_2,TNF-α and IL-1β contents in knee-joint synoviocyte supernatant were significantly higher in model group (P<0. 05). Compared with model group, PT increased obviously (P<0. 05); paw volume, supernatant PGE_2, TNF-α and IL-1β contents decreased obviously (P<0. 05) in EA group. Conclusion EA of ST 36 and SP 6 has a pronounced therapeutic effect in relieving knee joint pain and inflammation in CIA rats, which may be related to its effect in regulating the secretory function of the knee-joint synoviocytes.