自免疫性和H. 螺旋杆菌感染协同促进上皮细胞瘤原生分化和全身免疫调节
bioRxiv : the preprint server for biology
|December 15, 2025
概括
自身免疫和Helicobacter pylori (HP) 感染一起抑制免疫力并促进胃癌. 这种组合加快了胃癌的发展,即使在HP消除后,突出了需要新的治疗方法.
科学领域:
- 免疫学 免疫学 免疫学
- 胃肠病学 胃肠病学
- 在瘤学瘤学.
背景情况:
- 胃癌 (GC) 的发病率在年轻人群,特别是女性中正在上升.
- 虽然慢性Helicobacter pylori (HP) 感染是已知的危险因素,但其患病率下降并不能解释早期出现GC的增加.
- 女性更常见的自身免疫是潜在的促成因素,可能与HP感染相互作用.
研究的目的:
- 研究HP感染和自身免疫对胃瘤发生和免疫反应的联合影响.
- 了解在GC发育中HP与自身免疫之间的相互作用背后的分子和细胞机制.
主要方法:
- 使用CTLA4缺陷小鼠模型 (CTLA4KD) 进行自身免疫驱动的GC,感染HP.
- 通过组织学评估瘤发生,并通过光谱流细胞计分析免疫细胞.
- 与HP共同培养人类PBMC,然后进行流细胞计和基因表达分析.
主要成果:
- 结合HP感染和自身免疫,加速了腹膜发育不良和胃粘膜中的三级淋巴体结构的增加.
- 在组合条件下,E-Cadherin和DMBT1的损失加剧.
- 观察到NK细胞 (先天性免疫) 的添加性减少和Helios表达的CD4+T细胞 (适应性免疫) 的合作性增加,这些细胞表现出抑制标记物.
结论:
- 自免疫和HP感染协同诱导长期抑制先天性和适应性免疫.
- 这种组合促进了肠上皮细胞在胃中的瘤性分化.
- 研究结果表明,在早期发病的胃癌中,除了消除HP之外的干预措施是必要的.
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