石榴皮鞣质对实验性胃损伤的作用

Effects of Pomegranate tannins on experimental gastric damages

目的:研究石榴皮鞣质对动物实验性胃损伤的影响。方法:应用大鼠幽门结扎型胃溃疡模型、大鼠乙醇诱导的胃黏膜损伤模型和小鼠水拘禁应激致胃溃疡模型,观察不同剂量的石榴皮鞣质ig给予对实验性胃损伤的防治作用,对胃黏膜中一氧化氮(NO)和丙二醛(MDA)含量,对谷胱甘肽还原酶(GSH-PX)和超氧化物歧化酶(SOD)活力,对胃液、胃酸、胃黏液和胃蛋白酶分泌的影响。结果:石榴皮鞣质(500,150,50 mg.kg-1)ig给予呈剂量依赖性明显抑制水拘禁应激性小鼠胃溃疡及大鼠幽门结扎型胃溃疡的形成和无水乙醇致胃黏膜损伤的发生,阻遏无水乙醇引起的胃黏膜组织内NO水平下降和MDA生成增加,抑制胃黏膜GSH-PX和SOD活力降低和促进胃黏液的分泌,但对胃液分泌、游离酸度、总酸度和总酸排出量及胃蛋白酶活性无明显影响。结论:石榴皮鞣质对动物实验性胃溃疡具有良好的防治疗作用,这种作用可能与促进胃黏液分泌,维护黏膜屏障的完整性,进而减少自由基生成、降低抗脂质过氧化反应酶的消耗和调控NO水平有关。

Objective： To observe the antiulcer effects of pomegranate tannins in animal models. Method： Gastric ulcer models were established by pylorus ligation, intragastric absolute ethanol, and water-immersion stress, respectively. The ulcer index, the contents of nitric oxide （NO） and malondialdehyde （ MDA）, the activities of glutathione peroxidase （GSH-PX） and superoxide dismutase （SOD） from gastric mucosa of rats, the gastric juice volume, free acidity, total acidity,total acid output, the pepsin activity, the amount of adherent mucus and free mucus were measured, respectively. Result： Pomegranate tannins （500,150,50 mg·kg^-1 ） significantly inhibited ulcerative formation induced by both water immersion stress and pylorus ligation, obviously decreased the gastric mucosa damages induced by intragastric absolute ethanol, in dose-dependent manner. Pomegranate tannins significantly inhibited absolute alcohol-induced elevation of MDA as well as decreasing of NO level, and activities of both SOD and GHS-PX from gastric mucosa. Pomegranate tannins significantly increased the secretion of adherent mucus and free mucus, but did not affect elevation of the free acidity, total acidity, and total acid output, gastric juice volume, gastric pepsin activity induced by pylorus ligation. Conclusion： Pomegranate tannins play a protective role against gastric ulcer. Its antiulcer effect is related to increasing secretion of adherent mucus and free mucus from the stomach wall, which may inhibit generation of oxygen-derived free radicals, and decrease the consumption of GSH-PX and SOD, and maintain content of NO at normal level.