在Cryptococcus neoformans的先天性交配类型之间,卡路里限制的明显效应
Natalia Kronbauer Oliveira1, Kyungyoon Yoo1, Somanon Bhattacharya2
1Department of Microbiology and Immunology, Renaissance School of Medicine, Stony Brook University, Stony Brook, NY, 11794, USA.
Scientific reports
|August 6, 2024
概括
卡路里限制 (CR) 在Cryptococcus neoformans交配类型中不同地延长了酵母的寿命. MATα细胞使用sirtuins并获得可纳耐受性,而MATA细胞降低TOR信号的调节.
科学领域:
- 菌类学 菌类学是指菌类学.
- 细胞生物学 细胞生物学
- 衰老研究研究 衰老研究
背景情况:
- 新型菌 (Cryptococcus neoformans) 是一种机会性病原体,会引起脑膜炎.
- 已知卡路里限制 (CR) 可以延长复制寿命 (RLS),并模仿与Cn感染相关的低葡萄糖条件.
- 之前关于Cn中CR效应的研究仅集中在MATα交配类型上.
研究的目的:
- 为了比较Cn.的MATα和MATa交配类型之间的CR介导的压力和寿命调节的影响.
- 在每个交配类型中,研究CR不同调节的分子通路.
- 确定CR对不同交配类型的抗真菌药物耐受性的影响.
主要方法:
- 在CR条件下对MATα和MATa菌株进行比较分析.
- 基因表达分析侧重于sirtuins和TOR通路组件.
- 测量氧化应激,ATP生产和ABC输送活性.
- 评估在CR的反应中对可纳的耐受性.
主要成果:
- 无论是MATα细胞还是MATA细胞都在CR下扩展了RLS,但通过不同的机制.
- 在MATα细胞中,Sirtuins被上调,其中SIR2对于RLS延伸至关重要,而MATA细胞没有显示sirtuin上调.
- 在CR下,TOR信号在MATa细胞下调,但在MATα细胞中没有.
- 由于ABC载体的上调,MATα细胞表现出减少的氧化应激,更高的ATP产生,以及增强的可纳耐受性.
- 在这两种交配类型中,SIR2在线粒体功能中发挥了作用.
结论:
- 在Cryptococcus neoformans中,CR会诱导特定于交配类型的反应.
- 糖因子,TOR和代谢途径的差异调节会影响长寿和耐药性.
- 了解这些交配类型的差异对于开发有效的抗真菌策略至关重要.
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