Features of the regulation of reparative processes of chronic wounds in response to the effect of photobiomodulation therapy on a wound defect. Photobiomodulation therapy for chronic wounds.

Abstract

Background: One of the promising methods of influencing the wound process is photobiomodulation (PBM) therapy. The optimal parameters of PBM therapy have not yet been found because the molecular mechanisms of light interaction with tissue are not fully understood.

Objective: Studying the influence of PBM of various parameters on the regulation of reparative process- es of chronic wounds using the example of indicators of aggregation activity of platelets, platelet-derived growth factor (PDGF), interleukin-8 (IL-8), and amino-terminal propeptide of type III procollagen (PIIINP) at the remodeling stage. And also the study of the structural and functional features of chronic wound heal- ing in an experiment under various parameters of PBM therapy.

Methods: Experiments were carried out on Wistar rats. Chronic wounds were simulated. Experimental animals were exposed to PBM at a wavelength of 660 nm and an energy density of 1 J/cm2. In serum, PDGF, IL-8, and PIIINP levels were measured by enzyme-linked immunosorbent assay. The functional activity of platelets was measured using the turbidimetric method. Histological analysis was performed.

Results: The work noted the dose-dependent effect of PBM using the example of platelet aggregation at the remodeling stage during the healing of chronic wounds. The use of PBM therapy resulted in increased serum PDGF levels. Histological examination data indicate a positive effect of PBM therapy on the wound healing process.

Conclusions: The effectiveness of the use of PBM therapy for the healing of chronic wounds to regulate reparative processes has been proven.