电针足三里穴对烫伤早期大鼠肝损伤的影响

目的 评价电针足三里穴对烫伤早期大鼠肝损伤的影响.方法 40只成年雄性SD大鼠,体重220～250 g,采用随机数字表法,将其随机分为5组(n=8):假手术组(Ⅰ组)、烫伤组(Ⅱ组)、电针足三里穴组(Ⅲ组)、非经非穴组(Ⅳ组)和α7烟碱型乙酰胆碱受体拮抗剂α-银环蛇毒素组(Ⅴ组).Ⅱ组～Ⅴ组制备30%总体表面积Ⅲ度烫伤模型,烫伤后腹腔注射乳酸钠林格氏液进行液体治疗.液体治疗后Ⅲ组和Ⅴ组给予脉冲电流持续刺激双侧足三里穴20 min(刺激参数3 V,3 Hz,2 ms),每8 h刺激一次,共刺激6次,V组电针刺激前静脉注射α-银环蛇毒素1.0 μg/kg,Ⅳ组给予两侧非经非穴电针刺激.烫伤后48 h处死动物,取肝组织,采用ELISA法和免疫组化法测定高迁移率族-1(HMGB1)水平,光镜和电镜下观察肝组织病理学结果.结果 与Ⅰ组比较,Ⅱ组和Ⅳ组肝组织HMGB1水平升高(P＜0.01);与Ⅱ组、Ⅳ组和Ⅴ组比较,Ⅲ组肝组织HMGB1 水平降低(P＜0.05).Ⅲ组肝组织病理学损伤明显轻于Ⅱ组、Ⅳ组和Ⅴ组.结论 电针足三里穴可减轻烫伤早期大鼠肝损伤,其机制与激活α烟碱型乙酰胆碱受体介导的胆碱能抗炎通路有关.

Abstract：

Objective To. investigate the effect of electroacupuncture at acupoint Zusanli (ST36) on the liver injury during the early stage after bum in rats. Methods Forty adult male SD rats weighing 220-250 g were randomly divided into 5 groups ( n = 8 each) : group sham operation (group Ⅰ ) ; group burn (group Ⅱ ) ; group acupoint at Zusanli (ST36) (group Ⅲ ); group non-acupoint stimulation (group Ⅳ ) and group ST36 + alphabungarotoxin (alpha7 nicotinic acetylcholine receptor antagonist) (group Ⅴ ). Rats were subjected to 3rd degree burn covering 30% of the total body surface area. Rats were resuscitated with lactataed Ringer's solution according to Parkland formula (4 ml/kg per 1% body surface area) immediately after burn. Bilateral acupoints Zusanli were stimulated with constant voltage (3 V, 3 Hz,2ms) for 20 min 3 times a day for 2 days starting immediately after resuscitation in H and V groups. In group V alpha-bungarotoxin 1.0 μg/kg was administered iv immediately after fluid resuscitation before acupuncture. In group Ⅳ same electric stimulation was performed at a point 0.5 cm lateral to Zusanli. The animals were sacrificed at 48 h after burn. The content and expression of high mobility group box 1 (HMGB1) protein in liver were measured. Liver specimens were obtained for microscopic examination (with light and electronic microscope). Results Compared with group Ⅰ , hepatic HMGB1 protein level significantly increased in Ⅱ and Ⅳ groups. There were significant ultrastructural changes in the liver in burn rats in group Ⅱ and group Ⅳ. Electric stimulation of ST36 significantly attenuated the histologic changes in the liver and decreased the hepatic HMGB1 protein level in group Ⅲ . Pretreatment with specific alpha.7 nicotinie acetylcholine receptor antagonist alpha-bungarotoxin reversed the beneficial effect of electroacupuncture at Zusanli. Conclusion Electric stimulation of acupoint ST36 can ameliorate liver injury during the early stage of burn by activating alpha7 nicotinic acetylcholine receptor-mediated pathways for anti-inflammation.

Effect of electroacupuncture at Zusanli on liver injury during early stage after burn in rats

Objective To. investigate the effect of electroacupuncture at acupoint Zusanli (ST36) on the liver injury during the early stage after bum in rats. Methods Forty adult male SD rats weighing 220-250 g were randomly divided into 5 groups ( n = 8 each) : group sham operation (group Ⅰ ) ; group burn (group Ⅱ ) ; group acupoint at Zusanli (ST36) (group Ⅲ ); group non-acupoint stimulation (group Ⅳ ) and group ST36 + alphabungarotoxin (alpha7 nicotinic acetylcholine receptor antagonist) (group Ⅴ ). Rats were subjected to 3rd degree burn covering 30% of the total body surface area. Rats were resuscitated with lactataed Ringer's solution according to Parkland formula (4 ml/kg per 1% body surface area) immediately after burn. Bilateral acupoints Zusanli were stimulated with constant voltage (3 V, 3 Hz,2ms) for 20 min 3 times a day for 2 days starting immediately after resuscitation in H and V groups. In group V alpha-bungarotoxin 1.0 μg/kg was administered iv immediately after fluid resuscitation before acupuncture. In group Ⅳ same electric stimulation was performed at a point 0.5 cm lateral to Zusanli. The animals were sacrificed at 48 h after burn. The content and expression of high mobility group box 1 (HMGB1) protein in liver were measured. Liver specimens were obtained for microscopic examination (with light and electronic microscope). Results Compared with group Ⅰ , hepatic HMGB1 protein level significantly increased in Ⅱ and Ⅳ groups. There were significant ultrastructural changes in the liver in burn rats in group Ⅱ and group Ⅳ. Electric stimulation of ST36 significantly attenuated the histologic changes in the liver and decreased the hepatic HMGB1 protein level in group Ⅲ . Pretreatment with specific alpha.7 nicotinie acetylcholine receptor antagonist alpha-bungarotoxin reversed the beneficial effect of electroacupuncture at Zusanli. Conclusion Electric stimulation of acupoint ST36 can ameliorate liver injury during the early stage of burn by activating alpha7 nicotinic acetylcholine receptor-mediated pathways for anti-inflammation.