Wang Wen-Han, Chen Hsuan-Yu, Chen Sheng-Yuan, Lan Chung-Yu
Institute of Molecular and Cellular Biology, National Tsing Hua University, Hsinchu 300044, Taiwan.
Department of Life Science, National Tsing Hua University, Hsinchu 300044, Taiwan.
Biosci Rep. 2024 Dec 17;44(12). doi: 10.1042/BSR20240689.
Candida albicans is a member of the human commensal microbiota but can also cause opportunistic infections, including life-threatening invasive candidiasis, particularly in immunocompromised patients. One of the important features of C. albicans commensalism and virulence is its ability to adapt to diverse environmental stress conditions within the host. Rap1 is a DNA-binding protein identified in yeasts, protozoa, and mammalian cells, and it plays multiple functions, including telomere regulation. Intriguingly, our previous study showed that Rap1 is also involved in cell wall integrity, biofilm formation, and virulence in C. albicans. In this work, using RNA-seq analysis and other approaches, the role of C. albicans Rap1 in oxidative stress response was further revealed. The RAP1-deletion mutant exhibited greater resistance to the superoxide generator menadione, a lower level of intracellular reactive oxygen species (ROS) upon menadione treatment, and higher expression levels of superoxide dismutase genes, all in response to oxidative stress. Moreover, the association between Rap1-mediated oxidative stress response and the mitogen-activated protein kinase (MAPK) Hog1, the transcription factor Cap1 and the TOR signalling was also determined. Together, these findings expand our understanding of the complex signalling and transcriptional mechanisms regulating stress responses in C. albicans.
白色念珠菌是人类共生微生物群的成员,但也可引起机会性感染,包括危及生命的侵袭性念珠菌病,尤其是在免疫功能低下的患者中。白色念珠菌共生和致病的重要特征之一是其适应宿主体内多种环境应激条件的能力。Rap1是一种在酵母、原生动物和哺乳动物细胞中发现的DNA结合蛋白,它具有多种功能,包括端粒调控。有趣的是,我们之前的研究表明,Rap1也参与白色念珠菌的细胞壁完整性、生物膜形成和致病性。在这项工作中,通过RNA测序分析和其他方法,进一步揭示了白色念珠菌Rap1在氧化应激反应中的作用。RAP1缺失突变体对超氧化物生成剂甲萘醌表现出更强的抗性,在甲萘醌处理后细胞内活性氧(ROS)水平较低,超氧化物歧化酶基因的表达水平较高,所有这些都是对氧化应激的反应。此外,还确定了Rap1介导的氧化应激反应与丝裂原活化蛋白激酶(MAPK)Hog1、转录因子Cap1和TOR信号传导之间的关联。总之,这些发现扩展了我们对白色念珠菌应激反应复杂信号传导和转录机制的理解。
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