利用生物发光活体成像技术观察肠黏膜损伤状态下细菌易位的初步研究

[目的]临床上各种疾病会导致肠黏膜屏障损伤并伴随大量的细菌易位发生。本实验拟使用发光细菌的小鼠活体成像技术,观察肠黏膜损伤状态下易位细菌的动态移位过程。[方法]构建重组荧光脂酶基因(Lux)的质粒pXen-1、pXen-18,转化大肠杆菌DH5a,筛选阳性细菌克隆,扩增培养后,定量(107)注射到肠黏膜屏障损伤模型小鼠肠腔不同部位内,利用生物发光活体成像技术进行细菌易位的病理生理观察研究。实验分为四组:小肠注射菌实验组和对照组、盲肠注射菌实验组和对照组。其中实验组为肠道缺血再灌注损伤,对照组无任何干预措施。[结果]发光细菌小鼠活体成像观察到,存在肠黏膜损伤的小鼠肠腔内的细菌数量及分布发生明显的改变,提示细菌易位在肠黏膜损伤时起着重要的病理生理作用。注入小肠内的发光细菌数量在试验过程中明显下降,提示小肠肠腔环境可以杀灭一定的细菌。[结论]生物发光活体成像技术,可以直观、可靠、敏感地观察肠道内细菌的存活状态,并可观察肠黏膜损伤状态下细菌易位的动态过程。该技术为肠黏膜屏障损伤细菌易位机制的研究提供了一个有力的工具。

PRELIMINARY STUDY OF USING IN VIVO BIOLUMINESCENCE IMAGING TECHNIQUE TO OBSERVE BACTERIAL TRANSLOCATION IN A STATE OF INTESTINAL MUCOSAL INJURY

[Objective]Many clinical diseases will lead to intestinal mucosal barrier injury,while the mucosal barrier injury is accompanied by a large number of bacterial translocation.At present,there are many ways to confirm and detect ectopic intestinal bacteria.In this study,we use sensitive and reliable bioluminescence experiment,which is using luminous bacteria in mice in vivo imaging techniques,to observe the dynamics process of bacterial translocation in the state of intestinal mucosal injury,providing a relia...