A Relevant Wound-Like in vitro Media to Study Bacterial Cooperation and Biofilm in Chronic Wounds.

Autor:	Pouget C; Virulence Bactérienne et Infections Chroniques, INSERM U1047, Université de Montpellier, Nîmes, France.; Biofilm Pharma SAS, Saint-Beauzire, France., Dunyach-Remy C; Virulence Bactérienne et Infections Chroniques, INSERM U1047, Université de Montpellier, Department of Microbiology and Hospital Hygiene, CHU Nîmes, Nîmes, France., Bernardi T; Biofilm Pharma SAS, Saint-Beauzire, France., Provot C; Biofilm Pharma SAS, Saint-Beauzire, France., Tasse J; Biofilm Pharma SAS, Saint-Beauzire, France., Sotto A; Virulence Bactérienne et Infections Chroniques, INSERM U1047, Université de Montpellier, Department of Infectious and Tropical Diseases, CHU Nîmes, Nîmes, France., Lavigne JP; Virulence Bactérienne et Infections Chroniques, INSERM U1047, Université de Montpellier, Department of Microbiology and Hospital Hygiene, CHU Nîmes, Nîmes, France.
Jazyk:	angličtina
Zdroj:	Frontiers in microbiology [Front Microbiol] 2022 Apr 06; Vol. 13, pp. 705479. Date of Electronic Publication: 2022 Apr 06 (Print Publication: 2022).
DOI:	10.3389/fmicb.2022.705479
Abstrakt:	Biofilm on the skin surface of chronic wounds is an important factor in the pathology, inhibiting wound healing. The polymicrobial nature of these infected wounds and bacterial interactions inside this pathogenic biofilm are the keys for understanding chronic infection. The aim of our work was to develop an innovative in vitro medium that closely mimics the chronic wound emphasizing the microbiological, cellular, and inflammatory environment of chronic wounds but also focusing on the pH found at the wound level. This new medium, called chronic wound medium (CWM), will thus facilitate the study of pathogenic biofilm organization. Clinical Staphylococcus aureus and Pseudomonas aeruginosa strains coisolated from diabetic foot infection were collected and cultivated in this new medium for 24 h in monoculture and coculture. Bacterial growth (growth curves), presence of small colony variant (SCV), biofilm formation (BioFilm Ring Test ® assay, biofilm biomass quantification), and virulence (survival curve in a Caenorhabditis elegans model) were evaluated. After 24 h in the in vitro conditions, we observed that P. aeruginosa growth was not affected, compared with a control bacterial medium, whereas for S. aureus , the stationary phase was reduced by two logs. Interestingly, S. aureus growth increased when cocultured with P. aeruginosa in CWM. In coculture with P. aeruginosa , SCV forms of S. aureus were detected. Biofilm studies showed that bacteria, alone and in combination, formed biofilm faster (as soon as 3 h) than the bacteria exposed in a control medium (as soon as 5 h). The virulence of all strains decreased in the nematode model when cultivated in our new in vitro medium. Taken together, our data confirmed the impact of the chronic wound environment on biofilm formation and bacteria virulence. They indicated that P. aeruginosa and S. aureus cooperated in coinfected wounds. Therefore, this in vitro model provides a new tool for bacterial cooperation investigation and polymicrobial biofilm formation. Competing Interests: The authors were co-inventors of the CWM (European patent application EP21305337, filed on 18 March 2021). CPo was the recipient of a grant from Biofilm Pharma (Bourse CIFRE). CPo, TB, CPr, and JT were employed by Biofilm Pharma SAS. (Copyright © 2022 Pouget, Dunyach-Remy, Bernardi, Provot, Tasse, Sotto and Lavigne.)
Databáze:	MEDLINE
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