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Study of relation between ITF,COX-2,iNOS and gastric mucosa adaptation to stress in rats
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- Author:
- No author available
- Journal Title:
- CHINESE JOURNAL OF EMERGENCY MEDICINE
- Issue:
- 3
- DOI:
- 10.3760/j.issn:1671-0282.2005.03.006
- Key Word:
- 应激;胃黏膜;细胞保护;肠三叶因子;环氧合酶-2;诱导型一氧化氮合酶
Abstract： 目的研究肠三叶因子(ITF)、环氧合酶2(COX-2 )、诱导型一氧化氮合酶(iNOS)在水浸束缚应激(WRS)大鼠胃黏膜基因表达变化,探讨其在应激胃黏膜适应性细胞保护中的相互关系及作用.方法采用重复WRS制作模型,Ⅲ型激光多谱勒血流仪(LDF-3)动态监测胃黏膜血流量(GMBF),大体及光镜下观察黏膜损伤程度(UI)及组织学变化,逆转录-多聚酶链反应(RT-PCR)和Western blot检测ITF、COX-2及iNOS表达变化.结果单次应激造成胃黏膜广泛损伤,重复应激后胃黏膜产生适应性,胃黏膜血流量上升,损伤逐渐减轻;4次应激后,损伤指数降低为单次应激时的21.99%,并且胃腺区细胞增殖.单次应激后,ITF 、COX-2及iNOS均增强;重复应激后,ITF表达继续逐渐增强,而COX-2及iNOS表达则逐渐减弱;正常时,ITF 、COX-2及iNOS几乎无表达;应激后,ITF不但在胃腺颈部黏膜增殖带表达增强,而且在胃腺基底部亦有表达,COX-2及iNOS在溃疡及其边缘存在.结论胃黏膜适应性细胞保护伴有细胞增殖,ITF表达逐渐增强,COX-2及iNOS表达逐渐减弱;表明三者在这一现象中具有重要的调节作用.
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