Abstract
Nisin is a promising therapeutic candidate because of its potent activity against Gram-positive bacteria. The present study aimed to describe the in vitro and in vivo antibacterial effects of nisin against Streptococcus suis, an important zoonotic pathogen. The minimal inhibitory concentrations (MICs) and minimal bactericidal concentrations (MBCs) of nisin against different S. suis strains ranged from 0.12 to 4.0 μg/mL and from 0.25 to 8.0 μg/mL, respectively. Time-killing curve assays illustrated that nisin killed 100% of tested virulent S. suis strains within 4 h when used at 2× MIC, which indicates the rapid bactericidal activity of nisin against the bacteria. Transmission and scanning electron microscopy revealed that nisin destroyed S. suis cell membrane integrity and affected its cellular ultrastructure, including a significantly wrinkled surface, intracellular content leakage, and cell lysis. In addition, nisin inhibited biofilm formation by S. suis in a concentration-dependent manner and exhibited strong degrading activities against preformed biofilms. More importantly, nisin displayed antimicrobial activity against S. suis infection in vivo. Upon treatment with 5.0–10 mg/kg nisin solution, the survival rates of mice challenged with a lethal dose of virulent S. suis virulent ranged 87.5–100%. Nisin significantly decreased bacterial proliferation and translocation in the mouse spleen, brain, and blood. These results indicate that nisin has potential as a novel antimicrobial agent for the clinical treatment and prevention of infection caused by S. suis in animals.
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We thank Joe Barber Jr., PhD, from Liwen Bianji, Edanz Editing China (www.liwenbianji.cn/ac), for editing the English text of a draft of this manuscript.
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This work was supported by the National Key Research and Development Program (2018YFD0500101), the Special Fund for Public Welfare Industry of Chinese Ministry of Agriculture (201303041), the National Natural Sciences Foundation of China (31302114), and the Innovation of Agricultural Sciences in Jiangsu province (CX(14)5042). The funders had no role in the study design, data collection and analysis, decision to publish, or preparation of the manuscript.
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Conceived and designed the experiments: HZ, LH and KH. Performed the experiments: HZ, LH and DW. Analyzed the data: HZ, LH. Contributed reagents/materials/analysis tools: YN, ZY, JZ, BL and WZ. Wrote and revised the manuscript: HZ, LH and KH. All authors read, advised and approved the final manuscript.
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Zhu, H., Han, L., Ni, Y. et al. In vitro and In vivo Antibacterial Effects of Nisin Against Streptococcus suis. Probiotics & Antimicro. Prot. 13, 598–610 (2021). https://doi.org/10.1007/s12602-020-09732-w
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DOI: https://doi.org/10.1007/s12602-020-09732-w