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A New Approach to Detection of the Protective Effect of Escherichia coli on Gram-Positive Bacteria in Binary Biofilms in the Presence of Antibiotics

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Abstract

Binary biofilms containing gram-positive bacteria Micrococcus thailandicus HB or Kocuria rhizophila strain 4A-2G and gram-negative bacteria Escherichia coli strain K-12 or strain ET12567 pRAG56 were obtained. Strain E. coli ET12567 contained a plasmid encoding aminoglycoside phosphotransferase, the enzyme which inactivates kanamycin. A new kinetic approach was developed for selective detection of metabolically active gram-positive bacteria in binary biofilms with E. coli, based on the differences in reduction rate of the electron acceptor, 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT). It was found that the studied E. coli strains did not exert a protective effect upon the action of antibiotics vancomycin and oxacillin on gram-positive bacteria in the binary biofilms under formation. However, a protective effect was found in the case of preformed binary biofilms: the growth of gram-positive bacteria in binary biofilms was observed at the concentrations of antibiotics oxacillin and kanamycin, which almost completely suppressed growth in the mono-species biofilms of these gram-positive bacteria. The presence of a protective effect was confirmed by several methods (dynamics of MTT reduction, densitometric evaluation of biofilm staining, measurement of the optical density of MTT extracts, and CFU enumeration).

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FUNDING

This work was supported by the Ministry of Science and Higher Education of the Russian Federation.

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Correspondence to V. K. Plakunov.

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Statement of the welfare of animals. The present article does not contain any data obtained using animals as subjects.

Conflict of interests. The authors declare that they have no conflict of interests.

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Translated by A. Oleskin

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Plakunov, V.K., Nikolaev, Y.A., Gannesen, A.V. et al. A New Approach to Detection of the Protective Effect of Escherichia coli on Gram-Positive Bacteria in Binary Biofilms in the Presence of Antibiotics. Microbiology 88, 275–281 (2019). https://doi.org/10.1134/S0026261719030093

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