Potential of oxygen and nitrogen reactive intermediates to disperse Listeria monocytogenes from biofilms

被引:0
作者
Fernanda Barbosa dos Reis-Teixeira
Natália Conceição
Lilian Pereira da Silva
Virgínia Farias Alves
Elaine Cristina Pereira De Martinis
机构
[1] Universidade de São Paulo (FCFRP-USP),Faculdade de Ciências Farmacêuticas de Ribeirão Preto
[2] Universidade Federal de Goiás,Faculdade de Farmácia
来源
Brazilian Journal of Microbiology | 2019年 / 50卷
关键词
Dispersal; Reactive oxygen intermediate; ROI; Reactive nitrogen intermediate; RNI;
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学科分类号
摘要
Studying biofilm dispersal is important to prevent Listeria monocytogenes persistence in food processing plants and to avoid finished product contamination. Reactive oxygen and nitrogen intermediates (ROI and RNI, respectively) may trigger cell detachment from many bacterial species biofilms, but their roles in L. monocytogenes biofilms have not been fully investigated. This study reports on ROI and RNI quantification in Listeria monocytogenes biofilms formed on stainless steel and glass surfaces; bacterial culture and microscopy combined with fluorescent staining were employed. Nitric oxide (NO) donor and inhibitor putative effects on L. monocytogenes dispersal from biofilms were evaluated, and transcription of genes (prfA, lmo 0990, lmo 0807, and lmo1485) involved in ROI and RNI stress responses were quantified by real-time PCR (qPCR). Microscopy detected the reactive intermediates NO, peroxynitrite, H2O2, and superoxide in L. monocytogenes biofilms. Neither NO donor nor inhibitors interfered in L. monocytogenes growth and gene expression, except for lmo0990, which was downregulated. In conclusion, ROI and RNI did not exert dispersive effects on L. monocytogenes biofilms, indicating that this pathogen has a tight control for protection against oxidative and nitrosative stresses.
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页码:501 / 506
页数:5
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