结核菌利用SIRT2捕获铁,使其在细胞内存活
Sharmila Talukdar1, Radheshyam Modanwal1, Gaurav Kumar Chaubey1
1CSIR-Institute of Microbial Technology, Sector 39A, Chandigarh, 160036, India.
Free radical biology & medicine
|November 3, 2024
概括
结核菌 (Mtb) 通过操纵SIRT2,一种蛋白质脱乙酶来劫持宿主铁. 抑制SIRT2通过通过新型宿主防御机制限制铁的可用性来减少Mtb感染.
科学领域:
- 微生物学 微生物学
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
背景情况:
- 铁对宿主-病原体相互作用至关重要,而结核菌 (Mtb) 占用宿主铁以求生存.
- 主体免疫反应的目的是限制铁的可用性,以入侵病原体,如Mtb.
- SIRT2是一种依赖NAD+的脱乙酶,调节细胞铁稳态,并在Mtb感染期间升高调节.
研究的目的:
- 阐明Mtb利用SIRT2来指挥宿主铁的机制.
- 为了研究SIRT2在宿主铁限制策略中在Mtb感染期间的作用.
- 基于宿主导铁调节来确定结核病的新型治疗点.
主要方法:
- 在Mtb感染的巨细胞中,SIRT2的化学抑制和淘汰.
- 铁进口和出口蛋白质表达的分析.
- 流细胞计用于研究细胞内铁的动态.
- 对糖-3酸盐脱酶 (GAPDH) 招募到细胞表面的研究.
主要成果:
- 在SIRT2抑制或淘汰后降低了mtb细菌负荷,与铁的可用性降低有关.
- 铁运输蛋白的微分调节,表明宿主试图限制病原体铁的访问.
- 确定一种非正规的细胞内铁出口途径,涉及细胞表面GAPDH和阿波转林捕获.
结论:
- SIRT2通过促进病原体对宿主铁的获取,在Mtb病变发生过程中发挥着至关重要的作用.
- 宿主细胞在Mtb感染期间采用了一种涉及GAPDH的新机制来对铁进行隔离.
- 准SIRT2或已识别的铁出口途径为开发新的宿主导向结核病疗法提供了潜力.
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