肠上皮质PTPN2通过免疫导向的抗微生物反应限制了病原生物的殖民化
Pritha Chatterjee1, Marianne R Spalinger1,2, Charly Acevedo1
1Division of Biomedical Sciences, University of California, Riverside, Riverside, CA, USA.
Gut microbes
|September 16, 2025
概括
在肠道上皮细胞中失去蛋白氨酸酸酶非受体2型 (PTPN2) 会增加对致病性大肠杆菌的易感性. PTPN2对肠道免疫至关重要,调节抗微生物和屏障功能,以控制细菌殖民.
科学领域:
- 胃肠病学 胃肠病学
- 免疫学 免疫学 免疫学
- 微生物学 微生物学
背景情况:
- 蛋白氨酸酸酶非受体2型 (PTPN2) 活性的丧失与炎症性肠病 (IBD) 和改变的肠道微生物群有关.
- 附着侵入性大肠杆菌 (AIEC) 扩散与IBD病原发生有关,但宿主限制的机制尚不清楚.
研究的目的:
- 研究肠上皮细胞 (IEC) 特定PTPN2在调节AIEC殖民和宿主防御中的作用.
- 了解PTPN2如何影响肠道屏障和对细菌病原生物的免疫反应.
主要方法:
- 使用泰莫西芬诱导性IEC特异性Ptpn2淘汰赛小鼠 (Ptpn2∆IEC) 和对照 littermates.
- 被非侵入性大肠杆菌K12或光标记的mAIEC (mAIECred) 感染的小鼠和量化细菌负载.
- 评估mRNA/蛋白质表达,细胞因子水平 (IL-22,IL-6,IL-17A) 和肠道屏障功能,使用光德克斯探针.
主要成果:
- Ptpn2∆IEC小鼠与对照小鼠相比,在偏远结肠中显示出更多的mAIECred殖民.
- 在Ptpn2∆IEC小鼠中观察到α-defensin抗微生物 (AMPs) 和MMP7的减少表达后mAIECred感染.
- 在mAIECred感染后的Ptpn2∆IEC小鼠中,增加了肠道透性 (FD4) 和降低了IL-22,IL-6和IL-17A细胞因子水平.
- 再组合IL-22的使用逆转了透性缺陷,并减少了细菌负担.
结论:
- 肠上皮质PTPN2对于粘膜免疫和肠道平衡至关重要.
- PTPN2通过协调的上皮-免疫反应促进抗菌防御,限制病原生物殖民.
- 针对PTPN2介导的途径可能为IBD和相关疾病提供治疗策略.
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