Photobiological response of mast cells to green and red light-emitting diodes (LEDs) in cutaneous burns Rhuan Isllan dos Santos Gonçalves, José de Alencar Fernandes Neto, Joabe dos Santos Pereira, Cassiano Francisco Weege Nonaka, Maria Helena Chaves de Vasconcelos Catão Photochemistry and Photobiology, 2025 This study assessed the effects of red and green LEDs on mast cells (MCs) in third‐degree burns in 75 Wistar rats, divided into control, red LED (RED), and green LED (GREEN) groups. Animals were irradiated daily with RED (630 nm, 300 mW, 0.779 W/cm2, 9 J/cm2, 30 s) and GREEN (520 nm, 180 mW, 0.467 W/cm2, 60 J/cm2, 30 s). Histological sections stained with toluidine blue were analyzed for total and subtype MCs. Standardized MC counting was performed across the viable lesion area, considering lesion margins, through intact connective tissue and the integrity of skin appendages. No statistically significant differences in MCs 2 (with released granules and intact cell border) were found between groups. Irradiated groups showed increased total MCs at 7, 14, and 21 days (p < 0.05), with a decrease in MCs 1 (intact MCs) at all time points compared to control (p < 0.05). Significant changes in MCs 3 (with massive degranulation and partial or complete disintegration of the cell border) degranulation were noted in RED at 7, 14, and 21 days (p < 0.009) and in GREEN at 14 (p < 0.009) and 32 days (p < 0.028). Results suggest red and green LEDs modulate MC recruitment and degranulation in third‐degree burns.
RECENT SCHOLAR PUBLICATIONS
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MOST CITED SCHOLAR PUBLICATIONS
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