椎管注射氟柠檬酸对针刺保护高湿热应激大鼠胃黏膜作用的影响

目的:观察预先椎管注射氟柠檬酸(FCA)对针刺“足三里”穴保护受高湿热刺激大鼠胃黏膜损伤作用的影响,以探讨脊髓内胶质细胞是否参与此针刺作用。方法:将36只雄性SD大鼠随机分为6组。空白对照组(A)不做任何刺激;湿热应激组(B)大鼠放入仿真模拟气候舱内[干球温度(40.0±0.5)℃,相对湿度(60±5)%],60 min后取出;针刺+湿热应激组(C)大鼠放入仿真模拟气候舱内做应激处理的同时开始电针双侧“足三里”穴;FCA+湿热应激组(D)先向大鼠椎管注射FCA 1μL,60 min后做应激处理;FCA+针刺+湿热应激组(E)向大鼠椎管注射FCA 1μL后,再做电针和应激处理;椎管注射生理盐水(NS)+针刺+湿热应激组(F)向大鼠椎管注射NS 10μL后,再做电针和应激处理。采用免疫组织化学方法观察脊髓腰膨大段胶质原纤维酸性蛋白(GFAP)和小胶质细胞特异性标记物OX42的表达,并记录各组动物的胃黏膜损伤指数。结果:大鼠在高湿热刺激60 min后胃黏膜出现点、线状出血灶,并有溃疡形成。B组胃黏膜损伤指数为33.7±2.8,而C组胃黏膜损伤指数明显下降为20.4±1.6(P<0.01),同时腰膨大后角浅层中GFAP和OX42的表达有明显增加(P<0.01)。E组胃黏膜损伤指数为24.1±2.7,腰膨大GFAP和OX42的表达有明显下调,与C组比较差异有统计学意义(P<0.05)。F组与C组之间比较无明显差异。结论:电针“足三里”穴对高湿热应激大鼠胃黏膜损伤具有保护作用,脊髓腰膨大中的胶质细胞可能参与了此保护作用。

Influence of Intrathecal Injection of Fluorocitrate on the Protective Effect of Electroacupuncture on Gastric Mucosa in High Humid Heat Stress Rats

OBJECTIVE: To study if the spinal glial cells involve in the protective effect of acupuncture on gastric mucosa in high humid heat stress rats. METHODS: Thirty-six male SD rats were randomized into 6 groups: control, stress model, electroacupuncture (EA), Fluorocitrate(FCA, intrathecal injection of FCA. 1 microL, 60 min before humid heat stress), EA+ normal saline (NS, intrathecal injection of NS) and EA+ FCA groups. Stress model was established by putting the rats in a container with higher temperature and higher humidity [(40.0 +/- 0.5) degrees C, relative humidity (60 +/- 5)%] for 60 min. EA (50 Hz, intermittent waves, 2-5 V) was applied to bilateral "Zusanli" (ST 36) for 60 min. Using immunofluorescent methods, we observed glial fibrillary acidic protein (GFAP) and microglia OX42 immunoreactivity (OD value) in the tissue of the lumbar enlargement segment of the spinal cord. We evaluated and recorded the damage index (DI) of gastric mucosa of rats according to Guth's method. RESULTS: There were clear dot-line-like hemorrhage foci with formation of ulcer in the gastric mucosa 60 minutes after high humid heat stimulation. Compared with model group, DI of gastric mucosa in EA and EA+ NS groups decreased significantly (P < 0.05, suggesting a protective effect of EA on the gastric mucosa under stress), OD values of EA and EA + NS groups increased considerably (P < 0.05). Comparison between EA and EA+ FCA groups showed that DI of EA + FCA group was higher than that of EA group, while the OD values of GFAP and OX42 in EA+ FCA group was markedly lower than those in EA group (P < 0.05), suggesting an inhibitory effect of FCA on the effects of EA in improving stress-induced damage of gastric mucosa and upregulation of GFAP and OX42 expression. CONCLUSION: EA at "Zusanli" (ST 36) can prevent the gastric mucosa from injury caused by high humid heat stimulation. The lumbar spinal glial cells may play a role in EA's protective function.