Indole contributes to tetracycline resistance via the outer membrane protein OmpN in Vibrio splendidus

As an interspecies and interkingdom signaling molecule, indole has recently received attention for its diverse effects on the physiology of both bacteria and hosts. In this study, indole increased the tetracycline resistance of Vibrio splendidus. The minimal inhibitory concentration of tetracycline...

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Bibliographic Details
Published in:World Journal of Microbiology and Biotechnology
Main Authors: Zhang, Shanshan, Shao, Yina, Zhao, Xuelin, Li, Chenghua, Guo, Ming, Lv, Zhimeng, Zhang, Weiwei
Format: Article in Journal/Newspaper
Language:English
Published: 2020
Subjects:
Biology and Life Sciences
Vibrio splendidus
Indole
Tetracycline resistance
Outer membrane protein
ESCHERICHIA-COLI
PATHOGENICITY
EXPRESSION
VIRULENCE
TURBOT
GENES
Turbot
Online Access:https://biblio.ugent.be/publication/8654610
http://hdl.handle.net/1854/LU-8654610
https://doi.org/10.1007/s11274-020-02813-6
https://biblio.ugent.be/publication/8654610/file/8654611
Description
Summary:As an interspecies and interkingdom signaling molecule, indole has recently received attention for its diverse effects on the physiology of both bacteria and hosts. In this study, indole increased the tetracycline resistance of Vibrio splendidus. The minimal inhibitory concentration of tetracycline was 10 mu g/mL, and the OD600 of V. splendidus decreased by 94.5% in the presence of 20 mu g/mL tetracycline; however, the OD600 of V. splendidus with a mixture of 20 mu g/mL tetracycline and 125 mu M indole was 10- or 4.5-fold higher than that with only 20 mu g/mL tetracycline at different time points. The percentage of cells resistant to 10 mu g/mL tetracycline was 600-fold higher in the culture with an OD600 of approximately 2.0 (higher level of indole) than that in the culture with an OD600 of 0.5, which also meant that the level of indole was correlated to the tetracycline resistance of V. splendidus. Furthermore, one differentially expressed protein, which was identified as the outer membrane porin OmpN using SDS-PAGE combined with MALDI-TOF/TOF MS, was upregulated. Consequently, the expression of the ompN gene in the presence of either tetracycline or indole and simultaneously in the presence of indole and tetracycline was upregulated by 1.8-, 2.54-, and 6.01-fold, respectively, compared to the control samples. The combined results demonstrated that indole enhanced the tetracycline resistance of V. splendidus, and this resistance was probably due to upregulation of the outer membrane porin OmpN.

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