G9a和Sirtuin6在表观遗传上调节宿主胆固醇的积累,以促进菌根细菌的生存
Praveen Prakhar1, Bharat Bhatt1, Gaurav Kumar Lohia1
1Department of Microbiology and Cell Biology, Indian Institute of Science, Bangalore, Karnataka, India.
PLoS pathogens
|October 23, 2023
概括
主体胆固醇的积累有助于Mycobacterium结核病 (Mtb) 通过减少氧化压力生存. 基斯基因修饰剂G9a和SIRT6协调了这一过程,为Mtb感染提供了新的治疗点.
科学领域:
- 微生物学 微生物学
- 分子生物学分子生物学
- 免疫学 免疫学 免疫学
背景情况:
- 主体胆固醇对于Mycobacterium结核病 (Mtb) 病原发生至关重要.
- Mtb用来积累宿主胆固醇的分子机制尚未完全理解.
研究的目的:
- 为了阐明 WNT 响应性基因组修饰剂在 Mtb 诱导的宿主胆固醇积累中的作用.
- 研究宿主胆固醇积累对Mtb存活率和宿主免疫反应的影响.
主要方法:
- 使用了MTB感染的体外和体外小鼠模型.
- 研究了G9a (H3K9甲基转移酶) 和SIRT6 (H3K9脱乙酶) 的功能.
- 评估与胆固醇代谢,摄取和排泄相关的基因表达,以及抗氧化基因.
主要成果:
- G9a和SIRT6协调,以增加MTB感染细胞中的胆固醇积累.
- G9a促进了胆固醇生物合成和摄取基因,而SIRT6,与G9a一起,抑制了胆固醇外流基因.
- 累积的胆固醇增强了抗氧化剂基因表达,减少了氧化应激,并支持了Mtb的生存.
- 功能丧失或抑制G9a/SIRT6降低了宿主胆固醇和Mtb负担.
结论:
- 通过操纵宿主胆固醇代谢,G9a和SIRT6在Mtb感染中发挥了新的作用.
- 由G9a和SIRT6主导的宿主胆固醇积累,增强了抗氧化防御,促进了Mtb的生存.
- 准G9a和SIRT6是对MTB感染的潜在治疗策略.
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