Jornal Vascular Brasileiro
Jornal Vascular Brasileiro
Artigo Original

Inibição da expressão de ciclooxigenase 2 em feridas cutâneas de camundongos NOD submetidos à terapia a laser de baixa intensidade

Inhibition of cyclooxygenase 2 expression in NOD mice cutaneous wound by low-level laser therapy

Carolina de Lourdes Julião Vieira Rocha; Adeir Moreira Rocha Júnior; Beatriz Julião Vieira Aarestrup; Fernando Monteiro Aarestrup

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CONTEXTO: A terapia a laser de baixa intensidade (LLLT) tem sido relatada como importante moduladora da cicatrização de feridas cutâneas aumentando a proliferação fibroblástica associada ao aumento da expressão da citocina fator transformador de crescimento- β2 (TGF-βB2). OBJETIVO: No presente estudo foram avaliados os efeitos da LLLT sobre a expressão da enzima ciclooxigenase 2 (COX2) no sítio do reparo tecidual utilizando o modelo experimental com camundongos diabéticos não obesos (NOD) para estudar a cicatrização de feridas cutâneas. MÉTODOS: Foram utilizados 30 camundongos NOD, destes 14 ficaram diabéticos e foram divididos em dois grupos: o grupo I (n=7) foi submetido a um procedimento cirúrgico de feridas cutâneas e o grupo II (n=7) foi submetido a um procedimento cirúrgico de feridas cutâneas e tratados com LLLT. O grupo II foi submetido à LLLT nos seguintes parâmetros: 15 mW de potência, dose de 3,8 J/cm² e tempo de aplicação de 20 segundos. Após sete dias do ato cirúrgico e após aplicação do laser, os animais foram eutanasiados com sobredose de anestesia e amostras das feridas foram colhidas para posterior análise histopatológica, histomorfométrica e imuno-histoquímica. RESULTADOS: A LLLT promoveu a inibição da expressão da COX2 em feridas cutâneas de camundongos diabéticos. CONCLUSÃO: Em conjunto, os resultados sugeriram que a LLLT é capaz de modular negativamente a expressão da enzima COX2 contribuindo para o controle da resposta inflamatória em feridas cutâneas de camundongos NOD.


camundongos endogâmicos NOD, ciclooxigenase 2, terapia a laser de baixa intensidade


BACKGROUND: Low-level laser therapy (LLLT) has been reported to modulate the healing of wounds by inducing an increase in fibroblast number associated with increased expression of the cytokine transforming growth factor-β2 (TGF-β2). OBJECTIVE: In the present study, the effect of LLLT on expression of COX2 at the site of tissue repair was evaluated, using an experimental model with non obese diabetic mice (NOD) to study cutaneous wound healing. METHODS: Thirty NOD mice were used, of which 14 were diabetic and were divided into two groups: group I (n=7) underwent a surgical procedure of skin wounds and group II (n=7) underwent a surgical procedure of skin wounds and treated with LLLT. Group II was submitted to LLLT in the following parameters: 15 mW of power, dose of 3.8 J/cm² and exposure time of 20 seconds. Seven days after surgery and after laser application, animals were euthanized with an overdose of anesthesia and tissue samples were collected for subsequent histological analysis, histomorphometry and immunohistochemistry. RESULTS: The LLLT has promoted the inhibition of COX2 expression in skin wounds in mice diabetic. Taken together the results suggest that LLLT modulate the expression of COX2 improved the control of inflammatory reaction in cutaneous wound lesions in NOD mice. CONCLUSION: Taken together, the results suggested that LLLT is able to negatively modulate the expression of COX2 enzyme contributing to the inflammatory response in cutaneous wounds in NOD mice.


mice, inbred NOD, cyclooxygenase 2, laser therapy, low-level


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