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Negative-Pressure Wound Therapy in a Pseudomonas aeruginosa Infection Model

Guoqi Wang1, Zhirui Li1, Tongtong Li2

  • 1Department of Orthopedics, Chinese PLA General Hospital, No. 28 Fuxing Road, Beijing 100853, China.

Biomed Research International
|June 5, 2018
PubMed
Abstract

Insights

Negative-pressure wound therapy (NPWT) effectively reduces Pseudomonas aeruginosa virulence factors, biofilm components like eDNA, and bacterial counts in infected wounds. This therapy inhibits virulence-regulated gene expression, aiding in infected wound management.

Area of Science:

  • Wound Healing and Infectious Disease Research
  • Microbiology and Molecular Biology

Background:

  • Negative-pressure wound therapy (NPWT) is a recognized treatment for contaminated wounds, particularly those infected with Pseudomonas aeruginosa.
  • The study investigates NPWT's impact on virulence factors and biofilm formation in P. aeruginosa wound infections.

Purpose of the Study:

  • To evaluate the efficacy of NPWT in reducing P. aeruginosa virulence factors and biofilm components.
  • To determine NPWT's effect on the expression of virulence-regulated genes in P. aeruginosa.

Main Methods:

  • Rabbit wound models were inoculated with P. aeruginosa and treated with NPWT or gauze.
  • Quantification of virulence factors (exotoxin A, rhamnolipid, elastase) and biofilm component (eDNA) was performed.
  • Gene expression analysis using RT-PCR and in vivo biofilm visualization were conducted.

Main Results:

  • NPWT significantly reduced virulence factors, bacteria counts, and eDNA compared to control treatment.
  • NPWT treatment led to significant inhibition of P. aeruginosa virulence-regulated genes and quorum-sensing systems.
  • Biofilm formation was notably reduced in the NPWT group.

Conclusions:

  • NPWT demonstrates effectiveness in decreasing bacterial load, virulence factors, and eDNA in P. aeruginosa infected wounds.
  • The study suggests NPWT's benefits stem from reduced virulence gene expression and enhanced drainage.
  • Findings provide clinical insights into NPWT mechanisms for treating infected wounds.

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