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Glutathione reductase modulates endogenous oxidative stress and affects growth and virulence in Avibacterium paragallinarum

文献类型： 外文期刊

作者： Zhi, Yan 1 ; Mei, Chen 1 ; Liu, Zhenyi 1 ; Liu, Ying 1 ; Wang, Hongjun 1 ;

作者机构： 1.Beijing Acad Agr & Forestry Sci, Inst Anim Husb & Vet Med, Beijing, Peoples R China

关键词： Glutathione reductase; Av. paragallinarum; Oxidative stress; Bacterial virulence; Redox homeostasis; Metabolic adaptation

期刊名称：VETERINARY RESEARCH （ 影响因子：3.5； 五年影响因子：4.0 ）

ISSN： 0928-4249

年卷期： 2025 年 56 卷 1 期

页码：

收录情况： SCI

摘要： Glutathione reductase (GR) plays a pivotal role in managing oxidative stress, a process crucial for microbial virulence and adaptation, yet it has not been extensively explored in bacteria such as Avibacterium paragallinarum (Av. paragallinarum). This study examined the specific roles of GR in Av. paragallinarum, focusing on how GR modulates the bacterium's response to oxidative stress and impacts its pathogenic behavior. Using gene knockouts together with transcriptomic and metabolomic profiling, we identified an important shift in redox balance due to GR deficiency, which disrupted energy metabolism and weakened the oxidative stress defense, culminating in a notable decline in virulence. In addition, decreased growth rates, reduced biofilm production, and weakened macrophage interactions were observed in GR-deficient strains. Notably, our findings reveal a sophisticated adaptation mechanism wherein the bacterium recalibrated its metabolic pathways in response to GR deficiency without fully restoring virulence. Our in vivo studies further highlight the pivotal role of GR in pathogen fitness. Together, our findings connect GR-mediated redox control to bacterial virulence, thereby furthering the understanding of microbial adaptation and positioning GR as a potential antimicrobial target. Our insights into the GR-centric regulatory network pave the way for leveraging bacterial redox mechanisms in the development of novel antimicrobial therapies, highlighting the importance of oxidative stress management in bacterial pathogenicity.

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