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Characterization of Actinobacillus seminis biofilm formation

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Abstract

Actinobacillus seminis is an autochthonous gram-negative bacterium that affects reproductive organs, causing epididymitis, low fertility, and occasional abortions in ovine and goats. The virulence factors and the pathogenicity mechanisms of A. seminis have not been clearly elucidated yet. In this work, biofilm production by A. seminis in in vitro assays is described and characterized. After 48-h incubation at 37 °C in trypticase soy broth, A. seminis formed biofilms containing an extracellular matrix comprised mainly of fibrillar material. Microaerophilia or the presence of calcium diminished biofilm formation in approximately 50% and 70%, respectively, but low iron concentrations increased it 40%. Through enzymatic digestion, it was found that proteins were the main component of these biofilms. Structural observations through scanning electron microscopy indicated the presence of a high amount of fibrillar material in which bacteria were immersed. Antibodies against different bacterial surface proteins, such as anti-biofilm matrix and anti-adhesin, diminished biofilm formation in 70% and 25%, respectively; whereas furanone C-30 and LED-209, compounds described as quorum-sensing inhibitors, completely inhibited biofilm formation. In conclusion, environmental conditions can influence strongly biofilm formation in A. seminis, and this could be an advantageous strategy that allows bacteria to persist inside a host.

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Funding

This study was funded by grant from DGAPA-UNAM PAPIIT IN219919. FMG is a doctoral student from the Programa de Doctorado en Ciencias de la Producción y Salud Animal, Universidad Nacional Autónoma de México (UNAM) and was supported by a scholarship from CONACYT (283503).

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EZ and ENA designed the experiments, FMG, LR and CVC performed the experiments. EZ, ENA and CVC wrote the drafts of the article. EZ, ENA, FMG and CVC revised this last version of the manuscript.

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Correspondence to Erasmo Negrete Abascal.

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The authors declare that they have no conflict of interest.

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García, J.F.M., Rojas, L., Zenteno, E. et al. Characterization of Actinobacillus seminis biofilm formation. Antonie van Leeuwenhoek 113, 1371–1383 (2020). https://doi.org/10.1007/s10482-020-01447-w

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  • DOI: https://doi.org/10.1007/s10482-020-01447-w

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