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Effect of laser therapy on skeletal muscle repair process in diabetic rats

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Abstract

Skeletal muscle myopathy is a common source of disability in diabetic patients. This study evaluated whether low-level laser therapy (LLLT) influences the healing morphology of injured skeletal muscle. Sixty-five male Wistar rats were divided as follows: (1) sham; (2) control; (3) diabetic; (4) diabetic sham; (5) nondiabetic cryoinjured submitted to LLLT (LLLT); (6) diabetic cryoinjured submitted to LLLT (D-LLLT); and (7) diabetic cryoinjured non-treated (D). Diabetes was induced with streptozotocin. Anterior tibialis muscle was cryoinjured and received LLLT daily (780 nm, 5 J/cm2, 10 s per point; 0.2 J; total treatment, 1.6 J). Euthanasia occurred on day 1 in groups 1, 2, 3, and 4 and on days 1, 7, and 14 in groups 5, 6, and 7. Muscle samples were processed for H&E and Picrosirius Red and photographed. Leukocytes, myonecrosis, fibrosis, and immature fibers were manually quantified using the ImageJ software. On day 1, all cryoinjured groups were in the inflammatory phase. The D group exhibited more myonecrosis than LLLT group (p < 0.05). On day 14, the LLLT group was in the remodeling phase; the D group was still in the proliferative phase, with fibrosis, chronic inflammation, and granulation tissue; and the D-LLLT group was in an intermediary state in relation to the two previous groups. Under polarized light, on day 14, the LLLT and D-LLLT groups had organized collagen bundles in the perimysium, whereas the diabetic groups exhibited fibrosis. LLLT can have a positive effect on the morphology of skeletal muscle during the tissue repair process by enhancing the reorganization of myofibers and the perimysium, reducing fibrosis.

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Acknowledgments

This study was supported by the Fundação de Amparo à Pesquisa do Estado de São Paulo (grants: 2011/20867-3; 2011/17638-2; and 2011/04452-8). The authors thank Fabiana dos Santos, Carina Aparecida dos Santos, and Daniela dal Molin Pissutti for their valuable technical assistance during the experimental procedures.

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The authors declare no conflicts of interest related to this study.

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Correspondence to Cristiane Miranda França.

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França, C.M., de Loura Santana, C., Takahashi, C.B. et al. Effect of laser therapy on skeletal muscle repair process in diabetic rats. Lasers Med Sci 28, 1331–1338 (2013). https://doi.org/10.1007/s10103-012-1249-2

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  • DOI: https://doi.org/10.1007/s10103-012-1249-2

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