Biofilm model on mice skin wounds

Area of Science:

• Microbiology
• Wound Healing Research
• Translational Medicine

Background:

• Biofilms are crucial in chronic wound pathogenesis.
• Pseudomonas aeruginosa is a common pathogen in wound infections.
• Understanding biofilm formation is key to effective treatment.

Purpose of the Study:

• To establish and evaluate a mouse model for Pseudomonas aeruginosa biofilm in excisional cutaneous wounds.
• To assess the impact of biofilm induction on wound healing kinetics and clinical parameters.

Main Methods:

• A preclinical study using 64 C57BL/6 mice, divided into control and intervention groups.
• Evaluation of wound healing, bacterial load, and tissue morphology via wound closure, quantitative culture, and transmission electron microscopy (TEM).
• Clinical assessments included liver tissue culture, weight variation, and leukocyte counts.

Main Results:

• A bacterial load of 10^4 CFU·mL^-1 induced infection and impacted survival.
• Delayed wound healing and necrotic tissue were observed in the intervention group at days 5 and 7 (p < 0.0001 and p < 0.01, respectively).
• Significant differences in wound cultures and animal weight were noted at days 5 and 7 (p < 0.01), while liver cultures and leukocyte counts showed no statistical differences. TEM did not identify bacteria in planktonic or biofilm forms.

Conclusions:

• The study's results challenge the current understanding of the ease and prevalence of biofilm formation in chronic wounds.
• Further research is needed to elucidate the mechanisms of biofilm development and its role in non-healing wounds.
• The model's limitations, particularly the lack of TEM confirmation of biofilms, warrant careful interpretation of findings regarding biofilm presence.