Impact of acidic and alkaline conditions on Staphylococcus aureus and Acinetobacter baumannii interactions and their biofilms

IF 2.3 3区 生物学 Q3 MICROBIOLOGY
Suthi Subbarayudu, P Snega priya, Rajakrishnan Rajagopal, Ahmed Alfarhan, Ajay Guru, Jesu Arockiaraj
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引用次数: 0

Abstract

Bacterial biofilms pose significant challenges due to their association with antibiotic resistance, metabolic adaptation, and survival under harsh conditions. Among notable pathogens forming biofilms, Staphylococcus aureus and Acinetobacter baumannii are concerning pathogens in nosocomial settings. However, their behaviour under acidic (pH 4.5) and alkaline (pH10.5) conditions, especially in co-culture setups, remains insufficiently understood. This study investigates these aspects, by examining growth rates, biofilm formation, pH shifts, phenotypic analysis, and gene expression profiles. The results showed A. baumannii exhibited reduced  growth and biofilm formation at pH 4.5, while S. aureus showed slow growth and low biofilm formation at pH10.5 in mono-cultures. S. aureus leaned towards an acidic pH (6–6.5), whereas A. baumannii shifted towards an alkaline pH (8–9). In co-culture environments, growth rates and biofilm formation increased across all pH conditions, converging towards a neutral pH over time. Phenotypic motility assays indicated that A. baumannii exhibited greater motility in alkaline conditions, while S. aureus showed increased staphyloxanthin production under acidic conditions. Gene expression analyses revealed that the fibronectin-binding protein A (FnbA) and N-acetylglucosaminyl-transferase (icaA) genes, responsible for initial attachment during biofilm formation, were highly expressed in acidic co-culture condition but poorly expressed in alkaline condition. In A. baumannii, the outer membrane protein A (OmpA) gene associated with adhesion and virulence, was upregulated in co-culture. The LuxR gene involved in quorum sensing was upregulated in acidic conditions and poorly expressed at pH 10.5. This study elucidates the metabolic adaptability and biofilm formation tendencies of S. aureus towards acidic conditions and A. baumannii towards alkaline conditions, providing insights for better management of biofilm-related infections.

酸性和碱性条件对金黄色葡萄球菌和鲍曼不动杆菌相互作用及其生物膜的影响。
由于细菌生物膜与抗生素耐药性、新陈代谢适应性和在恶劣条件下的生存有关,因此带来了巨大的挑战。在形成生物膜的主要病原体中,金黄色葡萄球菌和鲍曼不动杆菌是非医院环境中的常见病原体。然而,人们对它们在酸性(pH4.5)和碱性(pH10.5)条件下的行为,尤其是在共培养条件下的行为,仍然缺乏足够的了解。本研究通过检测生长率、生物膜形成、pH 值变化、表型分析和基因表达谱,对这些方面进行了研究。结果表明,鲍曼尼氏菌在 pH 值为 4.5 时的生长和生物膜形成均有所减少,而金黄色葡萄球菌在单培养基 pH 值为 10.5 时的生长缓慢,生物膜形成较少。金黄色葡萄球菌偏向于酸性 pH 值(6-6.5),而鲍曼不动杆菌偏向于碱性 pH 值(8-9)。在共培养环境中,生长率和生物膜的形成在所有 pH 值条件下都有所增加,随着时间的推移逐渐趋向于中性 pH 值。表型运动试验表明,鲍曼不动杆菌在碱性条件下表现出更强的运动能力,而金黄色葡萄球菌在酸性条件下则显示出更多的短链霉素产生。基因表达分析表明,负责生物膜形成过程中初始附着的纤连蛋白结合蛋白 A(FnbA)和 N-乙酰葡糖胺基转移酶(icaA)基因在酸性共培养条件下表达较高,而在碱性条件下表达较低。在鲍曼不动杆菌中,与粘附和毒力有关的外膜蛋白 A(OmpA)基因在共培养中上调。参与法定量感应的 LuxR 基因在酸性条件下上调,而在 pH 10.5 条件下表达较差。这项研究阐明了金黄色葡萄球菌对酸性条件和鲍曼不动杆菌对碱性条件的代谢适应性和生物膜形成倾向,为更好地处理生物膜相关感染提供了启示。
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来源期刊
Archives of Microbiology
Archives of Microbiology 生物-微生物学
CiteScore
4.90
自引率
3.60%
发文量
601
审稿时长
3 months
期刊介绍: Research papers must make a significant and original contribution to microbiology and be of interest to a broad readership. The results of any experimental approach that meets these objectives are welcome, particularly biochemical, molecular genetic, physiological, and/or physical investigations into microbial cells and their interactions with their environments, including their eukaryotic hosts. Mini-reviews in areas of special topical interest and papers on medical microbiology, ecology and systematics, including description of novel taxa, are also published. Theoretical papers and those that report on the analysis or ''mining'' of data are acceptable in principle if new information, interpretations, or hypotheses emerge.
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