biofilms9-100
https://doi.org/10.5194/biofilms9-100
biofilms 9 conference
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Bidirectional alterations in antibiotics susceptibility in Staphylococcus aureus - Pseudomonas aeruginosa dual-species biofilm

Elena Trizna1, Diana Baidamshina1, Maria Yarullina1, Anna Mironova1, Alsu Khabibrakhmanova2, Almira Kurbangalieva2, and Airat Kayumov1
Elena Trizna et al.
  • 1Kazan Federal University, Institute of Fundamental Medicine and Biology, Genetics, Russian Federation (trizna9144@gmail.com)
  • 2Kazan Federal University, A. Butlerov Institute of Chemistry, Biofunctional Chemistry Laboratory, Russian Federation (almira99@mail.ru)

While in biofilms bacteria are embedded into an extracellular matrix which forms inaccessible barrier for antimicrobials thereby drastically increasing the concentrations of antibiotics required for treatment. Here we show that the susceptibility of S. aureus and P. aeruginosa to antibiotics in mixed biofilms significantly differs from monoculture biofilms depending on both conditions and chosen antimicrobial agents. While S. aureus could completely avoid vancomycin, ampicillin and ceftriaxone by embedding into the biofilm of P. aeruginosa, the very same consortium was characterized by 10–fold increase in susceptibility to broad-spectrum antimicrobials like ciprofloxacin and aminoglycosides compared to monocultures. These data clearly indicate that efficient treatment of biofilm-associated mixed infections requires antimicrobials active against both pathogens, since the interbacterial antagonism would enhance the efficacy of treatment. Moreover, similar increase in antibiotics efficacy was observed when P. aeruginosa suspension was added to the mature S. aureus biofilm, compared to S. aureus monoculture, and vice versa. These findings open promising perspectives to increase the antimicrobial treatment efficacy of the wounds infected with nosocomial pathogens by the transplantation of the skin residential microflora.

This work was supported by the Russian Science Foundation (Project №20-64-47014)

How to cite: Trizna, E., Baidamshina, D., Yarullina, M., Mironova, A., Khabibrakhmanova, A., Kurbangalieva, A., and Kayumov, A.: Bidirectional alterations in antibiotics susceptibility in Staphylococcus aureus - Pseudomonas aeruginosa dual-species biofilm, biofilms 9 conference, Karlsruhe, Germany, 29 September–1 Oct 2020, biofilms9-100, https://doi.org/10.5194/biofilms9-100, 2020