网络首发:2016-10-14,
纸质出版:2016
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诱导型多能干细胞通过修复ZO-1蛋白改善脓毒症小鼠肠 黏膜通透性和细菌移位[J]. 中山大学学报(医学科学版), 2016,37(5).
Effects of Human Induced Pluripotent Stem Cells on Intestinal Permeability and Bacterial Translocation of Lipopolysaccharide -induced Septic Mice via ZO -1 Restoration[J]. Journal of Sun Yat-sen University (Medical Sciences), 2016, 37(5).
诱导型多能干细胞通过修复ZO-1蛋白改善脓毒症小鼠肠 黏膜通透性和细菌移位[J]. 中山大学学报(医学科学版), 2016,37(5). DOI:
Effects of Human Induced Pluripotent Stem Cells on Intestinal Permeability and Bacterial Translocation of Lipopolysaccharide -induced Septic Mice via ZO -1 Restoration[J]. Journal of Sun Yat-sen University (Medical Sciences), 2016, 37(5). DOI:
【目的】 探讨诱导型多能干细胞(iPS-MSC)对脓毒症小鼠肠黏膜通透性的改善作用和对肠道菌群移位的影响。【方法】采用尾静脉注射脂多糖(LPS,10 mg/Kg)建立小鼠脓毒症模型。常规培养及传代iPS-MSC。在脓毒症建立2 h和6 h经小鼠尾静脉注射进行治疗干预(1 × 106/只)。利用基因重组技术制备新质粒pET28b(+)-EGFP,转染大肠杆菌,并在脓毒症后连续2 d予小鼠进行灌胃处理。在脓毒症发生72 h后,取各组小鼠腹水及肠系膜淋巴结匀浆于Kan抗性的LB培养基培养鉴定,计算和比较菌群负荷。通过透射电镜观察小鼠小肠黏膜上皮细胞超微结构的变化。Western blotting法检测各组小鼠肠黏膜ZO-1蛋白的表达。荧光显微镜下观察带有GFP绿色荧光蛋白的ips-MSC在损伤肠黏膜的移行和归巢情况。【结果】成功构建表达绿色荧光的重组大肠杆菌pET-28b(+)-EGFP作为实验用示踪菌。灌胃处理后,ips-MSC治疗的小鼠腹水和肠系膜淋巴结的示踪菌的菌负荷较脓毒症组明显降低,其中ips-MSC 2 h治疗组较6 h治疗组降低的更明显。透射电镜观察发现脓毒症小鼠肠系膜上皮细胞间紧密连接结构破坏,细胞间缝隙增宽,而经iPS-MSC治疗的小鼠细胞间紧密连接结构破坏明显改善,在2 h治疗组表现更为明显,伴随紧密连接蛋白ZO-1的表达水平升高。【结论】 静脉注射iPS-MSC能够向脓毒症小鼠损伤的肠黏膜移行,通过提高连接蛋白ZO-1的表达,修复紧密连接,改善脓毒症小鼠肠黏膜的通透性,减少脓毒症时肠道菌群的移位。
【Objective】 To investigate the beneficial effects of induced pluripotent stem cell(ips -MSC) on permeability of intestinal mucosa and bacterial translocation in septic mice. 【Methods】 Sepsis model of mice was induced by Lipopolysacharide(LPS,10mg/Kg)via tail vein. iPS -MSC were cultured routinely and injected by tail vein 2h and 6h after sepsis respectively. A new double expression pasmid pET28b(+) -EGFP was constructed with technology of genetic recombination and transfected into competent E.coli.All mice were administrated E.coli(10 mL/Kg) labeled with GFP gene by gavage for 2 days after sepsis. At 72h of the trial, mice were sacrified with ether.Bacterial translocation was assessed by bacterial culture of the ascetic fluid and mesenteric lymph nodes which were collected under strict sterile conditions. Ultrastructure changes of intestinal epithelial cells were observed by transmission electron microscope. ZO -1 protein expression of intestinal mucosa were detected by western blotting. The homing of ips -MSC to damaged intestine mucosal was observed by fluorescence microscope. 【Results】 The double expression plasmid named pET -28b(+) -EGFP was constructed and espressed green fluorescent protein in E.coli successfully. The bacteria burden of ascetic fluid and mesenteric lymph nodes of ips-MSC intervention group was lower than that of sepsis group,especially in LPS 2h+ips-MSC group.The tight junction was destroyed with opened gap junction, diorsered-arranged micovilli and neurophil infiltration of intestinal mucosal epithelium in septic mice, while the microstructure pathological changes were improved with ips-MSC treatment, especially 2h after sepsis.Meanwhile, lower expression level of ZO-1 protein was detected in sepsis group, compared with ips-MSC invertention, but there is no significant different between LPS2h+ips-MSC and LPS6h+ips-MSC group at 72h.The GFP-taggedips-MSC were observed in damaged intestine mucosal by fluorescence micropscope. 【Conclusion】 Ips-MSC could repare tight junction to improve permeability of intestinal mucosa and decrease bacterial translocation through structural protein ZO-1 expression level elevated.
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