Photobiomodulation by dual-wavelength low-power laser effects on infected pressure ulcers

Area of Science:

• Biomedical Engineering
• Wound Healing Research
• Photomedicine

Background:

• Pressure ulcers (PUs) pose a significant clinical challenge due to impaired healing and high infection rates.
• Bacterial bioburden complicates wound management and delays tissue regeneration.
• Novel therapeutic strategies are needed to enhance PU healing and combat infection.

Purpose of the Study:

• To investigate the efficacy of dual-wavelength photobiomodulation (PBM) on pressure ulcer healing.
• To assess the impact of PBM on bacterial bioburden in infected PU models.
• To evaluate PBM's effects on key tissue repair markers and inflammatory responses.

Main Methods:

• Development of pressure ulcer models in Swiss mice using ischemia reperfusion cycles.
• Infection of PU models with Pantoea agglomerans to simulate a clinical scenario.
• Application of dual-wavelength (660 and 808 nm) low-power laser therapy (PBM) over 14 sessions.
• Histological and molecular analysis of wound tissues, including contraction, reepithelialization, bacterial survival, and cytokine mRNA expression (IL-1β, IL-10).

Main Results:

• PBM significantly accelerated wound healing, showing improved contraction and reepithelialization in infected PUs treated with laser therapy compared to untreated infected controls.
• The PBM treatment led to a reduction in bacterial survival within the wounds.
• Analysis revealed a thinner neo-epidermis in infected, irradiated PUs, with a trend towards increased IL-1β and decreased IL-10 mRNA expression, suggesting modulation of the inflammatory environment.

Conclusions:

• Dual-wavelength photobiomodulation demonstrates therapeutic potential for pressure ulcer management.
• PBM enhances wound healing by reducing bacterial load and promoting tissue repair mechanisms.
• The findings suggest PBM is a promising adjunctive therapy for accelerating pressure ulcer healing and combating infection.