Abstract
This study analyzed the effects of light-emitting diode (LED) therapy on the morphology of muscle tissue as well as collagen remodeling and matrix metalloproteinase 2 (MMP-2) activity in the skeletal muscle of rats following acute injury. Wistar rats were divided into four groups: (1) control, (2) sham, (3) untreated cryoinjury, and (4) cryoinjury treated with LED. Cryoinjury was induced by two applications of a metal probe cooled in liquid nitrogen directly onto the belly of the tibialis anterior muscle. For treatment, the LED equipment (wavelength 850 nm, output power 30 mW, and total energy 3.2 J) was used daily. The study periods were 1, 3, and 7 days after cryoinjury. Morphological aspects were evaluated through hematoxylin-eosin staining. The amount of collagen fibers was evaluated using Picro Sirius Red staining under polarized light. The gelatinase activity of MMP-2 was evaluated using zymography. The results showed significant reductions in inflammatory infiltrate after 3 days and an increased number of immature muscle fibers after 7 days. Furthermore, treatment induced a reduction in the gelatinolytic activity of MMP-2 after 1, 3, and 7 days in comparison to the untreated injury groups and increased the collagen deposition after 3 and 7 days in the treated groups. LED therapy at 850 nm induced a significant reduction in inflammation, decreased MMP-2 activity, and increased the amount of immature muscle and collagen fibers during the muscle repair process following acute injury.
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Acknowledgments
The authors would like to thank UNINOVE and the Brazilian fostering agencies Coordination for the Improvement of Higher Education Personnel (CAPES- grant: 1182781), National Council for Scientific and Technological Development (CNPq- grants: 303662/2012 and 305739/2014-0), and São Paulo Research Foundation (FAPESP- grants: 2013/21540-3, and 2014/12381-1) for their financial support.
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The experiments were performed in accordance with the guidelines of the Brazilian National Council for Animal Experiments and received approval from the Ethics Committee for Animal Research of University Nove de Julho (UNINOVE) (process number AN0015/2013).
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de Melo, C.A.V., Alves, A.N., Terena, S.M.L. et al. Light-emitting diode therapy increases collagen deposition during the repair process of skeletal muscle. Lasers Med Sci 31, 531–538 (2016). https://doi.org/10.1007/s10103-016-1888-9
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DOI: https://doi.org/10.1007/s10103-016-1888-9