Local effect of melatonin in an original dermal film limiting lipid peroxidation and accelerating healing in experimental thermal trauma
Abstract
Background. Development and pathogenetic justification of new approaches for local therapy of thermal trauma (TT) is a relevant and in-demand issue. Of special interest are dermal films (DF) containing endogenous pleiotropic regulators of homeostasis. Melatonin (MT) is one of such regulators that is suggested to be protective in TT. The aim of this study was to evaluate the effect of MT in the original DF on indexes of repair and concentration of lipid peroxidation (LPO) products in the injured skin after experimental TT. Methods. Experiments were performed on 126 Wistar male rats. Grade IIIA TT with an area of 3.5% was modeled by immersing a section of interscapular skin in purified water at a temperature of 98-99 °C for 12 s. MT formulated into DF (0.005 g/g) based on sodium carboxymethylcellulose was applied after TT daily for 5 days. The macroscopic picture, area and depth of the burn wound, and the wound epithelization rate were evaluated on days 5 and 10 after TT. Concentration of LPO products in the injured skin homogenate was measured by extraction spectrophotometry in heptane and isopropanol phases of the lipid extract. Results. The accumulation of secondary and final LPO products in the heptane and isopropanol phases of the lipid extract on days 5 and 10 was associated with the burn area. The use of the original DF with MT resulted in a decrease in the absolute and relative areas of the burn and an increase in the rate of burn surface epithelialization. On day 5, a decrease in the content of secondary and final LPO products in the isopropanol phase was observed, and on day 10 decreases in secondary peroxidation products in the heptane phase and end LPO products in the isopropanol phase were detected. Conclusion. The results of this study demonstrated that MT formulated into DF accelerates skin repair in the TT focus due to its LPOlimiting effect, expands the understanding of MT pleiotropic effect, and represents a prerequisite for the clinical use of DF with MT.
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References
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