ResumoO emprego de fontes de luz de baixa potência, como diodos emissores de luz-LEDs, pode propiciar um recurso terapêutico opcional aos convencionais ou ser utilizado em conjunto com estes, com a vantagem do baixo custo e comprovada eficiência no tratamento de úlceras e outras enfermidades. O estudo de caso foi realizado com um paciente do Ambulatório de Clinicas do HC/UEL que apresenta úlceras nos membros inferiores. A aplicação foi feita uma vez por semana, empregando LEDs com comprimento de onda de 628 nm na úlcera do membro inferior esquerdo e o direito foi utilizado como controle. A evolução foi medida por meio de registro fotográfico, medida da área e mensuração da dor. Foram realizadas 18 sessões. Os resultados apontaram mudanças nas características clínicas da lesão e a área cicatrizada foi 30% maior em relação à úlcera controle. Quanto à dor, a escala análoga visual variou de oito para zero no membro irradiado e de nove para dois no controle. Assim, podese concluir que a LED terapia é um recurso de eleição no tratamento da úlcera venosa, nos aspectos cicatriciais e redução da dor. Palavras-chave: Úlcera. LED. Cicatrização.
AbstractThe use of low power light sources, such as diodes emitters of light -LEDs, provides an alternative and complementary therapeutic resource to the conventional ones, with the advantage of being cost-effective and reliable in the treatment of ulcers and other infirmities. This study was carried out on a patient from the HC/UEL Outpatient Clinic with ulcers on both lower limbs. LEDs were applied once a week, using a wave length of 628 nm on the left lower limb ulcer ,using the right limb as control. Evolution 1 Fisioterapeuta formada pela UEL, Aprimoramento em Ortopedia e Traumatologia pela USP -Ribeirão Preto, Especialista em Ciências Fisiológicas -UEL -Londrina, Doutora em Bases Gerais da Cirurgia -UNESP -Botucatu, Docente do Curso de Fisioterapia
The use of light emitting diodes (LED) as a therapeutic resource for wound healing has increased over the last years; however, little is still known about the molecular pathways associated to LED exposure. In the present study, we verified the effects of LED therapy on DNA methylation and expression of the DNA methyltransferase (Dnmt) genes, Dnmt1 and Dnmt3a, in an in vivo model of epithelial wound healing. Male Wistar rats were submitted to epithelial excision in the dorsal region and subsequently distributed within the experimental groups: group 1, animals that received irradiation of 0.8 J/cm(2) of LED (604 nm); group 2, animals that received 1.6 J/cm(2) of LED (604 nm); control (CTL), animals not submitted to therapeutic intervention. LED applications were performed during 7 days, and tissues from the periphery of the wound area were obtained for molecular analysis. The Image-J software was used for analysis of the wound area. DNA methylation was evaluated by ELISA-based method and gene expressions were quantified by real-time PCR. Decrease on global DNA methylation profile was observed in all experimental groups (CTL, 1, and 2) revealing the participation of DNA methylation in the healing process. Significant decrease in the wound area accompanied by increase in the Dnmt3a expression was associated to group 2. Based on our findings, we propose that DNA methylation is an important molecular mechanism associated to wound healing and that irradiation with 1.6 J/cm(2) of LED evokes an increase in the expression of the Dnmt3a that might associates to the efficiency of the epithelial wound healing.
ResumoEmbora haja atualmente um extenso emprego de fontes de luz como LASERs (Light Amplification by Stimulated Emission of Radiation) e LEDs (Light Emitting Diodes) em diversas técnicas terapêuticas, as bases científicas de seus efeitos sobre sistemas biológicos ainda é relativamente desconhecida pela comunidade acadêmica. Neste estudo é apresentada uma breve revisão sobre os efeitos da luz em sistemas biológicos. O emprego de fontes de luz de baixa potência, como diodos emissores de luzLEDs, pode propiciar um recurso terapêutico opcional aos convencionais ou ser utilizado em conjunto com estes, com a vantagem do baixo custo e comprovada eficiência no tratamento de úlceras e outras enfermidades. Palavras-chave: Propriedades óticas. Efeitos biológicos. Diodo emissor de luz. Led.
AbstractAlthough nowadays light sources such as LASERs (Light Amplification by Stimulated Emission of Radiation) and LEDs (Light Emitting Diodes) are largely used in several therapeutic areas, the scientific basis of their effects on biological systems still is relatively unknown by the academic community. In this study, a brief revision about effects of light on biological systems is presented. Low power light sources such as LEDs may be used as an alternative therapeutic method or be used associated to the conventional methods, having the advantage of being a low cost method and of proven efficiency in the treatment of ulcers and other diseases.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.