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Transcriptional up-regulation of nNOS in the dorsal vagal complex during low endotoxemia.

机译:低内毒素血症期间背迷走神经复合物中nNOS的转录上调。

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The present study analyses the expression and distribution of neuronal nitric oxide synthase (nNOS) in the brainstem of animals pre-treated with Escherichia coli or Helicobacter pylori LPS, at doses that modulate gastric motor function. Systemic administration of H. pylori LPS prevented in a dose-dependent manner (5, 40 and 100 microg kg(-1), i.v.) the increase in intragastric pressure induced by 2-deoxy-D-glucose (200 mg kg(-1), i.v.) in urethane-anaesthetized rats. Quantitative analysis showed a significant increase in the amount of nNOS mRNA induced by E. coli or H. pylori LPS (2 h later), in a segment of the brainstem containing the dorsal vagal complex (DVC). Immunohistochemical studies showed nNOS presence in the DVC of vehicle-treated rats. Both E. coli (40 microg kg(-1), i.p.) and H. pylori LPS (100 microg kg(-1), i.p.) significantly increased (2 h later) the number of nNOS immunoreactive cells in this area, mainly at the most rostral level. The present study shows that systemic administration of E. coli or H. pylori LPS induces a transcriptional up-regulation of the nNOS in the DVC of the brainstem and suggests a role for NO synthesis in this area in the control of gastric motor function under endotoxemia.
机译:本研究分析了用大肠杆菌或幽门螺杆菌LPS预处理的动物的脑干中神经元一氧化氮合酶(nNOS)的表达和分布,其剂量可调节胃运动功能。幽门螺杆菌LPS的全身给药以剂量依赖性方式(5、40和100 microg kg(-1),iv)防止了2-脱氧-D-葡萄糖(200 mg kg(-1)引起的胃内压升高),iv)在氨基甲酸乙酯麻醉的大鼠中。定量分析显示,在包含背迷走神经复合体(DVC)的脑干部分中,大肠杆菌或幽门螺杆菌LPS诱导的nNOS mRNA量显着增加(2小时后)。免疫组织化学研究表明,媒介物治疗大鼠的DVC中存在nNOS。大肠杆菌(40 microg kg(-1),ip)和幽门螺杆菌LPS(100 microg kg(-1),ip)均显着增加(2 h后)该区域nNOS免疫反应细胞的数量最有浮雕的水平。本研究表明,全身施用大肠杆菌或幽门螺杆菌LPS可以诱导脑干DVC中nNOS的转录上调,并提示该区域内NO合成在内毒素血症控制胃运动功能中的作用。

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