Study the antibacterial mechanism of cinnamaldehyde against drug-resistant Aeromonas hydrophila in vitro

文献类型： 外文期刊

第一作者： Yin, Lizi

作者： Yin, Lizi;Chen, Jiehao;Wang, Kaiyu;Geng, Yi;Lai, Weiming;Guo, Hongrui;Fang, Jing;Chen, Zhengli;Tang, Li;Huang, Chao;Ouyang, Ping;Li, Ningqiu;Huang, Xiaoli;Chen, Defang

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关键词： Cinnamaldehyde; A. hydrophila; Antibacterial mechanism; Cell morphology; Protein metabolism

期刊名称：MICROBIAL PATHOGENESIS （ 影响因子：3.738； 五年影响因子：3.663 ）

ISSN： 0882-4010

年卷期： 2020 年 145 卷

页码：

收录情况： SCI

摘要： Aeromonas hydrophila, a highly infectious pathogen, causes several infections in aquatic animals and huge economic losses. Antibiotics are often used to treat A. hydrophila infections. However, overuse and irrational usage of antibiotics has led to severe antibiotic residues and emergence of resistance. There is therefore an urgent need for a new sustainable drug to control bacterial infection. Cinnamaldehyde, a plant-derived ingredient, has been found to have good antibacterial activity against A. hydrophila in vitro, but its mechanism of action remains unknown. In this study, we investigated the mechanism of cinnamaldehyde against A. hydrophila by evaluating the effects of cinnamaldehyde on A. hydrophila cell growth, cell morphology, electrical conductivity, lactate dehydrogenase (LDH), protein metabolism and DNA. The minimal inhibitory concentration and minimum bactericidal concentration of cinnamaldehyde were 256 and 512 mu g/mL, respectively. Microscopy results showed disrupted cell wall and membrane, loss of cytoplasm, interior cavitation and unusual binary fission in the cinnamaldehyde-treated group. Electrical conductivity, LDH activity content and DNA extravasation in cinnamaldehyde-treated A. hydrophila increased by 7.14%, 16.75% and 20.29 mu g/mL, respectively. Furthermore, nucleic acid fluorescence intensity and density decreased over time in the cinnamaldehyde-treated group. Taken together, these findings suggest that cinnamaldehyde can inhibit the growth of A. hydrophila by disrupting cell membranes and affecting protein metabolism.

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