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Please use this identifier to cite or link to this item: http://repositorio.ufba.br/ri/handle/ri/16357

Title: Effect of LED Phototherapy (λ700 ± 20 nm) on TGF-β Expression During Wound Healing: An Immunohistochemical Study in a Rodent Model
Other Titles: Photomedicine and Laser Surgery
Authors: Sousa, Ana Paula Cavalcanti de
Valença Neto, Alberto de Aguiar Pires de Aguiar
Marchionni, Antônio Márcio Teixeira
Ramos, Marília de Araújo
Reis Júnior, João Alves dos
Pereira, Manoela Carrera Martinez Cavalcante
Cangussu, Maria Cristina Teixeira
Reis, Silvia Regina de Almeida
Pinheiro, Antonio Luiz Barbosa
Keywords: Phototherapy;Transforming Growth Factor beta
Issue Date: 2011
Abstract: The aim of the present investigation was to evaluate transforming growth factor β (TGF-β) expression on cutaneous wounds in rodents treated or not treated with LED light. Background: TGF-β 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, λ700 ± 20 nm, 16 mW, SAEF = 5 J/cm2, Illuminated Area = 2 cm2, 8 mWcm2, 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-β, 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-β 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-β at an early stage of the healing process.
Description: Texto completo: acesso restrito. p. 605-611
URI: http://repositorio.ufba.br/ri/handle/ri/16357
ISSN: 1549-5418
Appears in Collections:Artigos Publicados em Periódicos (Odontologia)

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