Produção Nacional
Revisado por pares
Effect of LED Phototherapy (λ700 ± 20 nm) on TGF-β Expression During Wound Healing: An Immunohistochemical Study in a Rodent Model
2011; Mary Ann Liebert, Inc.; Volume: 29; Issue: 9 Linguagem: Inglês
10.1089/pho.2010.2833
ISSN1557-8550
AutoresAna Paula Cavalcanti de Sousa, Alberto de Aguiar Pires de Aguiar Valença Neto, Antônio Márcio Teixeira Marchionni, Marília de Araújo Ramos, João Alves dos Reis Júnior, Manoela Carrera Martinez Cavalcante Pereira, Maria Cristina Teixeira Cangussú, Sílvia Regina de Almeida Reis, Antônio Luiz Barbosa Pinheiro,
Tópico(s)Laser Applications in Dentistry and Medicine
ResumoThe 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.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.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/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-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.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.
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