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Inhibition of Mycobacterium abscessus, M. chelonae, and M. fortuitum biofilms by Methylobacterium sp

The Journal of Antibiotics volume 73, pages 40–47 (2020)Cite this article

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Abstract

Methylobacterium sp. is isolated from water distribution systems and has been linked in the biofilms of the systems with a lower presence of Mycobacterium avium. In this study we aimed to determine the in vitro activity of Methylobacterium sp. in the development of rapidly growing mycobacteria (RGM) biofilms. Methylobacterium sp. CECT 7805 was added as a suspension of living bacteria (LB), an autoclaved suspension (AS), and an extract obtained after sonication (ES) at different times (24, 48, and 72 h), to preformed biofilms of Mycobacterium abscessus DSM 44196, Mycobacterium chelonae ATCC 19235, and Mycobacterium fortuitum ATCC 6841, using a 96 h control of each species. The biofilms were analyzed by confocal laser scanning microscopy and by the Calgary biofilm device using the plates MBECTM Biofilm Inoculator. A statistically significant reduction in the thickness and covered surface was observed in all mycobacterial biofilms with all forms of Methylobacterium sp. A statistically significant increase in the autofluorescence was observed in M. abscessus biofilms but not in other biofilms. The increased percentage of dead mycobacteria was statistically significant in all cases. The reduced log CFU (colony-forming units)/peg recount was statistically significant in M. chelonae biofilms after treatment with AS and ES, but in M. fortuitum biofilms the recount decreased only with AS. M. abscessus biofilms were always significantly reduced with AS at 72 h and with ES. Methylobacterium sp. could inhibit RGM biofilm formation. Living cells of Methylobacterium sp. were not necessary to inhibit the growth of a preformed biofilm. M. chelonae biofilms were the most greatly reduced.

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Authors and Affiliations

  1. Department of Clinical Microbiology, IIS-Fundación Jiménez Díaz, UAM, Madrid, Spain

    Marta García-Coca, Graciela Rodríguez-Sevilla, Andrea Pérez-Domingo, John-Jairo Aguilera-Correa, Jaime Esteban & María-Carmen Muñoz-Egea

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  1. Marta García-Coca
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  2. Graciela Rodríguez-Sevilla
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Correspondence to Marta García-Coca.

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García-Coca, M., Rodríguez-Sevilla, G., Pérez-Domingo, A. et al. Inhibition of Mycobacterium abscessus, M. chelonae, and M. fortuitum biofilms by Methylobacterium sp. J Antibiot 73, 40–47 (2020). https://doi.org/10.1038/s41429-019-0232-6

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