Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/79759
Type: Artigo de periódico
Title: Effect of LED Phototherapy (lambda 700 +/- 20 nm) on TGF-beta Expression During Wound Healing: An Immunohistochemical Study in a Rodent Model
Author: de Sousa, APC
Neto, ADPDV
Marchionni, AMT
Ramos, MD
dos Reis, JA
Pereira, MCMC
Cangussu, MCT
Reis, SRD
Pinheiro, ALB
Abstract: Objective: The aim of the present investigation was to evaluate transforming growth factor beta (TGF-beta) expression on cutaneous wounds in rodents treated or not treated with LED light. Background: TGF-beta is a multifunctional cytokine that presents a central action during tissue repair. Although several studies both in vitro and in vivo have shown that LED phototherapy influences tissue repair, a full understanding of the mechanisms involved in its usage, such as in the modulation of some growth factors, remains unclear. Materials and Methods: Under general anesthesia, 24 young adult male Wistar rats weighing 200-250 g had one excisional wound created on the dorsum of each, and were randomly distributed into two groups: G0 (Control) and G1 (LED, lambda 700 +/- 20 nm, 16 mW, SAEF - 5 J/cm(2), Illuminated Area - 2 cm(2), 8 mWcm(2), 626 s) Each group was subdivided into three subgroups according to the animal death timing (2, 4, and 6 days). LED phototherapy started immediately after surgery and was repeated every other day during the experimental time. Following animal death, specimens were removed, routinely processed to wax, cut and immunomarked with polyclonal anti-TGF-beta, and underwent histological analysis by light microscopy. The mean area of expression of each group was calculated. The data were statistically analyzed using ANOVA and Tukey's test. Results: The area of the expression of TGF-beta on LED-irradiated animals was significantly smaller than on controls at day 2 (p = 0.013). No significant difference was found at later times. It is concluded that the use of LED light, at these specific parameters, caused an inhibition of the expression of TGF-beta at an early stage of the healing process.
Country: EUA
Editor: Mary Ann Liebert Inc
Rights: embargo
Identifier DOI: 10.1089/pho.2010.2833
Date Issue: 2011
Appears in Collections:Unicamp - Artigos e Outros Documentos

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