铁调节蛋白2通过保持巨细胞中的溶酶体功能,有助于抗菌免疫
Chen Cheng1, Zhiyao Xing1, Wenxin Zhang1
1State Key Laboratory of Pharmaceutical Biotechnology, Jiangsu Key Laboratory of Molecular Medicine, Medical School, Nanjing University, Nanjing 210093, People's Republic of China.
概括
铁调节蛋白2 (IRP2) 缺乏会损害巨细胞的溶解体功能,增加肠道炎症期间对肝的敏感性. 在克罗恩病模型中,恢复TFEB功能可以防止细菌感染.
科学领域:
- 免疫学 免疫学 免疫学
- 胃肠病学 胃肠病学
- 分子生物学分子生物学
背景情况:
- 发烧性肝是结直肠癌和克罗恩病患者的并发症,与免疫细胞细菌清除受损有关.
- 铁调节蛋白2 (IRP2) 在细胞铁平衡中起作用,但其在肠道炎症期间免疫反应中的特定功能尚未完全理解.
研究的目的:
- 调查IRP2在保护肠道炎症期间免受肝的作用.
- 阐明IRP2影响巨细胞功能和细菌清除的分子机制.
主要方法:
- 使用全球和髓状细胞特异性IRP2缺乏的小鼠模型,经受酸德克斯诱导的肠损伤.
- 评估了肝脏组织和巨细胞中的 lysosomal 酸化,生物发生和细菌清除.
- 研究了转录因子EB (Tfeb) 的局部化及其下游基因表达.
- 检查了克罗恩病患者的临床样本,并利用生物信息学分析炎症性肠病患者数据库.
主要成果:
- 在肠道受伤的小鼠中,IRP2缺乏导致对肝的敏感性增加.
- IRP2对于溶酶体酸化和生物发生是必不可少的,对细菌清除至关重要.
- 缺少IRP2导致Tfeb的核转移减少,降低 lysosomal生物发生基因的调节.
- 通过抑制低氧诱导因子2或乳酸生产,Tfeb错位可逆.
- 克罗恩病患者的临床数据和生物信息分析证实了IRP2和TFEB依赖性溶解体基因表达的减少.
结论:
- 在肠道炎症期间,IRP2对于维持巨细胞溶解体功能和抗菌活性至关重要.
- IRP2促进了Tfeb核转位,从而促进了溶酶体生物发生和细菌清除.
- 对IRP2-Tfeb-lysosome轴的调节失调有助于在炎症性肠道疾病中增加肝的易感性.
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