ω-6大豆油脂肪乳对大鼠实验性胃溃疡的保护作用∗

摘要

目的：研究ω-6大豆油脂肪乳对乙酸烧灼诱导的大鼠胃溃疡的保护作用,并探讨其机制。方法将30只大鼠随机分为假手术组、模型对照组和ω-6大豆油脂肪乳组,每组10只。模型对照组和ω-6大豆油脂肪乳组制备胃溃疡模型。造模后第5天,ω-6大豆油脂肪乳组尾静脉注射ω-6大豆油脂肪乳10 mL.kg－1.d－1,假手术组与模型对照组尾静脉注射等容量0.9％氯化钠溶液,连续给药10 d。苏木精-伊红( HE)染色观察大鼠胃组织病理特征,酸碱中和滴定法测定大鼠胃酸浓度,比色法测定胃蛋白酶活力,硝酸还原酶法检测血清一氧化氮( NO),免疫组化法观测胃黏膜表皮生长因子受体(EGFR)表达水平。结果ω-6大豆油脂肪乳组大鼠胃黏膜溃疡面积(5.67±2.32) mm2,较模型对照组[(8.68±1.98) mm2]显著缩小(P<0.05)。模型对照组胃酸浓度(2.01±0.57) mmol.L－1,胃蛋白活力[(41.28±17.25) U],血清NO浓度(85.76±17.75)μmol.L－1；ω-6大豆油脂肪乳组胃酸浓度(1.70±0.53) mmol.L－1,胃蛋白活力(23.12±6.97 U),血清NO(64.62±13.86)μmol.L－1,均较模型对照组低,胃黏膜EGFR表达增加,其中胃蛋白活力、血清NO浓度、胃黏膜EGFR表达,差异有统计学意义( P<0.05)。结论ω-6大豆油脂肪乳可促进大鼠胃溃疡愈合,其机制可能与其抑制胃酸、胃蛋白酶及NO,促进EGFR对胃黏膜的保护作用有关。%Objective To study the preventive effect ofω-6 soybean oil fatty emulsion on gastric ulcer caused by acetic acid in rat model, and investigate its mechanisms. Methods Thirty healthy rats were randomly and equally assigned to the following 3 groups:sham operation,gastric ulcer,andω-6 Soybean oil fatty emulsion group.The model was induced by acetic acid. Five days after the model was established successfully,rats in ω-6 soybean oil group received the treatment by tail intravenous injection with the dose of 10 mL.kg-1 .d-1 ,the sham operation group and gastric ulcer group were given the same dose of 0.9%sodium chloride solution.The rats were sacrificed at 10th day after the treatment.The pathological changes of rat gastric ulcer tissue were observed by HE staining, and the concentration of gastric acid was detected by acid-base neutralization method,as well as the activity of pepsin was detected by colorimetry.Serum NO concentration was detected with nitrate reductive enzymatic method, and the expression of EGFR in gastric mucosal was detected with immunohistochemical method. Results Gastric ulcer area inω-6 soybean oil fatty emulsion group (5.67±2.32 mm2) was significantly lower than that in gastric ulcer group(8.68±1.98 mm2). The concentration of gastric acid (1.70±0.53 mmol.L-1), activity of pepsin(23.12±6.97 U) and NO level (64.62±13.86μmol.L-1 ) inω-6 soybean oil fatty emulsion group were much lower than those in the model control group.While the expression of EGFR in gastric ulcer tissue was increased after treatment withω-6 soybean oil fatty emulsion. Conclusion ω-6 soybean oil fatty emulsion exerts significant promotion effect on the healing of gastric ulcer,and its mechanism might be related to inhibiting the level of gastric acid, pepsin and NO, while improving the protective effect of EGFR on gastric mucosa.