Adaptive expression of biofilm regulators and adhesion factors of Staphylococcus aureus during acute wound infection under the treatment of negative pressure wound therapy in vivo
Open Access
- 23 April 2020
- journal article
- research article
- Published by Spandidos Publications in Experimental and Therapeutic Medicine
- Vol. 20 (1), 512-520
- https://doi.org/10.3892/etm.2020.8679
Abstract
Negative pressure wound therapy (NPWT) is gaining acceptance as a physical therapy for a wide variety of infected wounds. To gain insight into the response of bacteria to NPWT in vivo, the adaptive expression of biofilm regulators and adhesion factors of Staphylococcus aureus (S. aureus), the most frequently isolated pathogen in the clinic, during acute wound infection was investigated. A 3 cm full‑thickness dermal wound was created on each side of a rabbit back and inoculated with green fluorescent protein‑labeled S. aureus. NPWT was initiated at 6 h post inoculation, with the wound on the contralateral side as the untreated self‑control. The wounds were subjected to a 28 day observation period. Histological analysis, laser scanning confocal microscopy and scanning electron microscopy revealed a transition of S. aureus to a free‑living phenotype in tissues treated with NPWT, compared with microcolonies in untreated wounds. Viable bacteria counts showed a modest reduction in the bioburden of NPWT group on day 8 (P4 days during both stages of colonization. Meanwhile, low expression levels of the effector molecule (RNAIII) of the accessory gene regulator type I (agr) system was detected in NPWT group, suggesting that the bacterial density in NPWT‑treated wounds was under the threshold for agr activation, thus not leading to an active and invasive infection. The wounds treated by NPWT healed completely on day 28, compared with an average of an 8.11% defect area in the control group (P<0.001). The results of the current study indicated that S. aureus responds to NPWT by regulating gene expression, manifesting a decrease in biofilm formation and an increase in bacterial colonization in vivo, which potentially benefits the wound repair and healing process.Keywords
This publication has 41 references indexed in Scilit:
- Microbial Symbionts Accelerate Wound Healing via the Neuropeptide Hormone OxytocinPLOS ONE, 2013
- Bacteriophage Therapy for Staphylococcus aureus Biofilm–Infected WoundsPlastic and Reconstructive Surgery, 2013
- The Expression of Small Regulatory RNAs in Clinical Samples Reflects the Different Life Styles of Staphylococcus aureus in Colonization vs. InfectionPLOS ONE, 2012
- Staphylococcal biofilm disassemblyTrends in Microbiology, 2011
- Induction of Attachment-Independent Biofilm Formation and Repression ofhfqExpression by Low-Fluid-Shear Culture of Staphylococcus aureusApplied and Environmental Microbiology, 2011
- Peptide Signaling in the StaphylococciChemical Reviews, 2010
- Temporal Expression of Adhesion Factors and Activity of Global Regulators during Establishment ofStaphylococcus aureusNasal ColonizationThe Journal of Infectious Diseases, 2010
- Staphylococcal biofilms impair wound healing by delaying reepithelialization in a murine cutaneous wound modelWound Repair and Regeneration, 2009
- The biological role of death and lysis in biofilm developmentNature Reviews Microbiology, 2007
- Analysis of Relative Gene Expression Data Using Real-Time Quantitative PCR and the 2−ΔΔCT MethodMethods, 2001