ISSN 1006-298X      CN 32-1425/R

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肾脏病与透析肾移植杂志 ›› 2019, Vol. 28 ›› Issue (1): 30-35.DOI: 10.3969/j.issn.1006-298X.2019.01.006

• 论文 • 上一篇    下一篇


益生菌改善尿毒症大鼠肠道巨噬细胞介导的细菌移位

  

  • 出版日期:2019-02-28 发布日期:2019-03-04

Probiotics improve intestinal macrophagemediated bacterial translocation in experimental uremia

  • Online:2019-02-28 Published:2019-03-04

摘要:

目的:评估尿毒症大鼠是否存在肠道屏障功能异常及细菌移位,以及益生菌对肠道屏障功能和巨噬细胞功能的保护作用。
方法:5/6肾切除造模尿毒症大鼠,随机分为尿毒症组和尿毒症+益生菌组(乳酸杆菌灌胃4周),处死前2h绿色荧光蛋白标记的示踪大肠杆菌灌胃。比较示踪菌移位情况、肠道黏膜屏障功能、肠道通透性、血中内毒素和炎症因子水平。透射电子显微镜观察肠巨噬细胞形态;检测肠组织中早期生长因子1(EGR1)以及Toll样受体4(TLR4) mRNA和蛋白的表达。
结果:尿毒症组肠道组织、肠系膜淋巴结、肝脏、脾脏中可见绿色荧光标记的示踪菌并且示踪菌与巨噬细胞共定位。服用益生菌后,示踪菌在肠道和肠系膜淋巴结、肝脏、脾脏中的数量较服用前减少;肠道黏膜上皮细胞排列整齐、微绒毛结构完整、紧密连接结构模糊程度减轻;肠道通透性下降(P<005);血中内毒素、C反应蛋白(CRP)、白细胞介素6(IL6)、肿瘤坏死因子α(TNFα)(均P<005)水平显著降低;肠巨噬细胞伪足和突触增多;EGR1及TLR4 mRNA和蛋白的表达较前明显减少。
结论:尿毒症状态下,肠道细菌发生移位,巨噬细胞起到载体的作用,存在巨噬细胞吞噬功能障碍;乳酸杆菌改善细菌移位和微炎症状态。

关键词: 巨噬细胞, 细菌移位, 微炎症, 尿毒症

Abstract:

Objective:To investigated the involvement of macrophages in bacterial translocation(BT) and microinflammation in uremic rats and whether Lactobacillus(LB) can influence macrophage activity.
Methodology:Macrophages and GFPlabeled tracer bacteria in intestinal and parenteral tissues were observed by fluorescence microscopy. To detect changes after adminstration of  LB in the level of intestinal permeability,blood endotoxin,hsCRP,IL6,TNFα. RTPCR and western blot were employed to assess the mRNA and protein expression of EGR1 and TLR4.
Results:In uremic rats,the colocalization of GFPlabeled tracer bacteria and macrophages was visible in intestinal and parenteral tissues. Administration of Lactobacillus LB restored the protrusions and pseudopodia. Compared with the uremia group,the uremia+probiotic group exhibited macrophages with lower mRNA and protein expression of TLR4 and EGR1 (P<005) and endotoxin,intestinal permeability,hsCRP,IL6 and TNFα were significantly lower than those in uremia group (P<005).
Conclusion:
Macrophages with impaired phagocytic function are associated with BT.

Key words: macrophage, bacterial translocation, microinflammatio, nurem