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外源性自身诱导剂-2通过PAR2/MMP3信号通路缓解死性肠球炎的肠损伤
Qian Sun1, Yan-Chun Ji1, Qing Ai1
1Department of Neonatology, Children's Hospital of Chongqing Medical University, Chongqing, China; National Clinical Research Center for Child Health and Disorders, Chongqing, China; Key Laboratory of Children's Development and Disorders, Ministry of Education, Chongqing, China; National International Science and Technology Cooperation Base for Development and Critical Disorders in Children, Chongqing, China; Key Laboratory of Pediatrics in Chongqing, Chongqing 400014, China.
自动诱导剂-2 (AI-2) 通过增强肠道屏障蛋白质,如ZO-1和occludin来缓解死角性肠球炎 (NEC). 这项研究表明,AI-2在NEC模型中减少了炎症和损伤,提供了一个有前途的治疗方法.
科学领域:
- 微生物学和胃肠道学
- 分子生物学和细胞信号传递
背景情况:
- 不平衡的肠道微生物群和肠道屏障功能障碍是致死性肠球炎 (NEC) 发展的关键因素.
- 自动诱导剂-2 (AI-2) 显示出在修复肠道损伤和减少炎症方面的潜力.
研究的目的:
- 研究AI-2对NEC中zonula occludens-1 (ZO-1) 和occludin蛋白表达的作用.
- 为了评估AI-2在体内使用NEC小鼠模型和体内使用脂多糖 (LPS) 刺激的肠细胞在体内对AI-2的影响.
主要方法:
- 进行了肠道组织的组织学分析和细胞增殖试验 (CCK-8).
- 实时定量PCR (RT-qPCR) 评估了MMP3,PAR2,IL-1β和IL-6的mRNA水平.
- 分析了MMP3,PAR2,ZO-1和奥克卢丁的蛋白质表达,这些蛋白质通过西部斑,免疫组织化学和免疫光学分析.
主要成果:
- AI-2显著缓解了NEC诱导的肠损伤,并促进了IEC-6细胞的增殖.
- AI-2干预减少了MMP3和PAR2 (mRNA和蛋白质) 的表达,并降低了IL-1β和IL-6mRNA水平.
- AI-2 增加了紧结蛋白 ZO-1 和 occludin 的蛋白质水平.
结论:
- 在NEC模型中,AI-2增强了紧结蛋白表达 (ZO-1,ocludin),减轻了肠道损伤.
- AI-2的保护作用可能涉及到PAR2和MMP3信号通路的调制.
- AI-2显示出作为治疗性干预的显著前景,用于死性肠球炎.
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