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Antimicrobial activities of Agave fructans against multi-resistant and biofilm-producing Staphylococcus aureus isolated from bovine mastitis

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Abstract

Bovine mastitis is an emerging disease that causes large economic losses. Staphylococcus aureus its main etiological agent, is multi-resistant to antimicrobials and produces biofilm. The objective of this study was to investigate the effect of Agave fructans (AF), a type of prebiotic, on multi-resistant and biofilm-forming isolates of S. aureus. Ten isolates of S. aureus from bovine subclinical mastitis previously characterized as highly resistant to antimicrobials and biofilm formers were used in this study. The growth kinetics of S. aureus in the presence of AF was evaluated by the Baranyi and Roberts microbial growth model using the DMFit program. The antibacterial activity of AF against S. aureus was studied by the well-diffusion method and the effect on biofilm formation by the crystal violet method. All assays were performed in triplicate for each isolate and an ANOVA with Tukey’s post hoc was performed considering p < 0.05 as significant. The AF showed a decrease in maximum growth rate (µmax) and OD max levels (Ymax) in all isolates with all concentrations. Also, zones of inhibition were observed due to the effect of all AF concentrations in all isolates in a dose-dependent manner. Interestingly, S. aureus biofilm formation was inhibited by all AF concentrations assessed in this study. More investigations are required to elucidate the mechanisms of action of AF on S. aureus as well as in vivo studies to evaluate its therapeutic efficacy for bovine mastitis.

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The data sets generated during the present study are available from the corresponding author upon reasonable request.

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Acknowledgements

Amador-Sánchez MA thanks CONACYT for a scholarship for their postgraduate studies.

Guzmán-Rodríguez JJ thanks CONACYT for the postdoc fellowship.

We thank Dr. Pedro Damián Loeza Lara from the Universidad de la Ciénega del Estado de Michoacán de Ocampo who donated the S. aureus isolates for this research.

Project conducted by Elena Franco-Robles, member of Thematic network Sustainable Integral Use and Biotechnology of Agaves (AGARED), CONACYT, Mexico.

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All authors contributed to the study’s conception and design. Material preparation, data collection and analysis were performed by J.J.G.R., M.A.A.S, and E.F.R. The first draft of the manuscript was written by J.J.G.R. and E.F.R. and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Elena Franco-Robles.

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Guzmán-Rodríguez, J.J., Gutiérrez-Chávez, A.J., Meléndez-Soto, R.M. et al. Antimicrobial activities of Agave fructans against multi-resistant and biofilm-producing Staphylococcus aureus isolated from bovine mastitis. Vet Res Commun 48, 61–67 (2024). https://doi.org/10.1007/s11259-023-10180-4

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  • DOI: https://doi.org/10.1007/s11259-023-10180-4

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