大肠杆菌细胞毒性死因子-1通过引起氧化应激,DNA损伤和肠道透性改变来促进结直肠癌发生
Michela Tozzi1, Alessia Fiore2, Sara Travaglione2
1Department of Oncology and Molecular Medicine, Istituto Superiore di Sanità, Rome, Italy.
Journal of experimental & clinical cancer research : CR
|January 28, 2025
概括
来自大肠杆菌的细胞毒性死因子1 (CNF1) 毒素通过引起DNA损伤和改变肠道屏障功能来促进结直肠癌 (CRC). 这项研究证实了CNF1的存在.
科学领域:
- 微生物学 微生物学
- 胃肠病学 胃肠病学
- 在瘤学瘤学.
背景情况:
- 细菌毒素,特别是来自大肠杆菌的细胞毒性死因子1 (CNF1),在结肠直肠癌 (CRC) 发病过程中越来越多地被发现.
- 在CRC患者中,CNF1的患病率较高,并且在体外表现出促进瘤的作用,但此前尚未确定与CRC的直接因果关系.
研究的目的:
- 调查CNF1在结直肠癌 (CRC) 发病中的活性作用.
- 在体外和体内分析由CNF1诱导的特定亲致癌效应.
主要方法:
- 通过生命力测定,共聚焦显微镜 (γH2AX,53BP1) 和肠道细胞的细胞遗传学分析,评估了CNF1诱导的基因毒性.
- 在Caco-2单层和球体中评估CNF1-介导的肠道透性变化,有或没有炎症.
- 在体内炎症性肠病 (IBD) 模型中研究了CNF1的致癌潜力,使用免疫组织化学,免疫光和16SrRNA基因测序进行便微生物群分析.
主要成果:
- 在肠道上皮细胞中,CNF1诱导反应性氧物种和染色体不稳定.
- CNF1通过改变紧密的接口和阻碍球状分化来破坏肠道屏障的完整性.
- 在体内,CNF1的管理促进了IBD模型中的异常密码焦点和结肠直肠腺瘤,与中性恋透,改变的细胞因子概况和前瘤便微生物群转移有关.
结论:
- 这项研究提供了强有力的证据,表明CNF1积极促进结直肠癌发生.
- 这些发现提高了对细菌毒素在CRC中的作用的理解,并表明了对查和预防策略的含义.
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