一种线粒体质量控制机制可以逆转由Mycobacterium tuberculosis引起的菌体成熟停止
bioRxiv : the preprint server for biology
|December 11, 2023
概括
削弱p62蛋白质会破坏线粒体质量控制,导致Mycobacterium tuberculosis对溶酶体的向性增强. 这种意想不到的交叉声调逆转了细胞成熟的停止,为结核病治疗提供了新的途径.
科学领域:
- 细胞生物学 细胞生物学
- 免疫学 免疫学 免疫学
- 微生物学 微生物学
背景情况:
- 结核菌 (Mycobacterium tuberculosis,Mtb) 通过阻止菌体成熟来逃避宿主防御.
- 从含有Mtb的细胞中排除RAB7是这种逮捕的一个标志.
研究的目的:
- 调查线粒体质量控制 (MQC) 在Mtb病变发生中的作用.
- 确定可以逆转细胞成熟阻断 (PMA) 的新机制.
主要方法:
- 通过CRISPR介导的p62/SQSTM1.1的耗尽.
- 对Mtb生长,存活和在巨细胞内定位的分析.
- 评估线粒体质量控制途径,包括线粒体和线粒体衍生囊泡 (MDVs).
- 研究RAB7和TOM20的本地化和功能.
主要成果:
- p62 枯竭阻断了线粒体,但保持了线粒体质量.
- 在p62-贫乏细胞中,mtb生长和生存率显著降低.
- 观察到TOM20+线粒体衍生囊泡 (MDVs) 的增强生物发生.
- MDVs被定向于溶解体和Mtb-phagosomes,促进RAB7的招募和逆转PMA.
- 发现了氧化环境的增加和Mtb的溶酶体向.
结论:
- 在MQC和细胞成熟路径之间的一种新型交叉连接可以逆转Mtb诱导的PMA.
- 对于控制Mtb感染而言,p62依赖的MQC通路,特别是TOM20+MDV,至关重要.
- 利用这种MQC抗菌途径为宿主导的抗结核治疗提供了潜力.
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