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Role of histamine and acid back-diffusion in modulation of gastric microvascular permeability and hemorrhagic ulcers in Salmonella typhimurium-infected rats

机译:组胺和酸的反向扩散在鼠伤寒沙门氏菌感染大鼠胃微血管通透性和出血性溃疡的调节中的作用

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Documentation concerning the pathogenesis of gastric hemorrhagic ulcer in Salmonella typhimurium (Salmonella typhi)-infective disease is lacking. This research first proposed that alterations of mast cell histamine release, gastric acid back-diffusion and mucosal microvascular permeability are important in modulating gastric ulcer and hemorrhage in Salmonella typhi-infected rats. Additionally, effects of several histamine-related drugs on this ulcer model were evaluated. Male Wistar rats were deprived food for 36 h. Live cultures of Salmonella typhi (OU 5045, 1 x 1(10) CFU in 1.0 mL of sterilized phosphate buffer saline) were challenged intrajejunally to rats just before withdrawal of food. Control rats received the same volume of sterilized vehicle only. Rat stomachs were irrigated for 3 h with either normal saline or simulated gastric juice. Gastric acid back-diffusion, mucosal histamine concentration, microvascular permeability as well as luminal hemoglobin content and ulcer areas were determined. Severe gastric hemorrhage and mucosal ulcerations, particularly in acidic stomachs, were observed in Salmonella typhi-infected rats. A positive correlation of histamine to gastric hemorrhage and ulcer was found in those rats with Salmonella typhi-infection. This hemorrhagic ulcer in Salmonella typhi-infected rats was effectively ameliorated by intraperitoneal ketotifen, diphenhydramine and ranitidine but was worsen by exogenous histamine or diamine oxidase. In conclusion, enhancement of acid back-diffusion, mast cell histamine release and microvascular permeability is important in modulating gastric hemorrhage and ulcer in Salmonella typhi-infected rats. (C) 2003 Elsevier Inc. All rights reserved. [References: 38]
机译:缺乏关于鼠伤寒沙门氏菌(伤寒沙门氏菌)感染性疾病的胃出血性溃疡发病机理的文献。这项研究首先提出肥大细胞组胺释放,胃酸向后扩散和粘膜微血管通透性的改变在调节伤寒沙门氏菌感染大鼠的胃溃疡和出血中起重要作用。另外,评估了几种组胺相关药物对该溃疡模型的作用。雄性Wistar大鼠被剥夺食物36小时。在撤回食物之前,空肠内对鼠伤寒沙门氏菌的活培养物(OU 5045,在1.0 mL无菌磷酸盐缓冲盐水中的1 x 1(10)CFU)进行了空肠攻击。对照大鼠仅接受相同体积的无菌媒介物。用生理盐水或模拟胃液冲洗大鼠胃3小时。测定胃酸反扩散,粘膜组胺浓度,微血管通透性以及管腔血红蛋白含量和溃疡面积。在伤寒沙门氏菌感染的大鼠中观察到严重的胃出血和粘膜溃疡,特别是在酸性胃中。在伤寒沙门氏菌感染的大鼠中发现组胺与胃出血和溃疡呈正相关。伤寒沙门氏菌感染大鼠的这种出血性溃疡可通过腹膜内酮替芬,苯海拉明和雷尼替丁得到有效缓解,但外源性组胺或二胺氧化酶则可加剧这种出血性溃疡。总之,增强酸性反扩散,肥大细胞组胺的释放和微血管通透性在调节伤寒沙门氏菌感染大鼠的胃出血和溃疡中起重要作用。 (C)2003 Elsevier Inc.保留所有权利。 [参考:38]

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