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Photobiomodulation therapy on expression of HSP70 protein and tissue repair in experimental acute Achilles tendinitis

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Abstract

The aim of the present study was to investigate the effects of photobiomodulation (PBM) therapy on the expression of heat shock protein 70 (HSP70) and tissue repair in an experimental model of collagenase-induced Achilles tendinitis. Thirty Wistar rats (aged 12 weeks) were randomly distributed among control group (n = 8), tendinitis group (n = 11), and LED group (n = 11). Tendinitis was induced in the tendinitis and LED groups through a peritendinous injection of collagenase (100 μl). The LED group animals received the first irradiation 1 h after injury. A 630 ± 20 nm, 300-mW continuous wave light-emitting diode (LED), spot size 1 cm2, was placed in contact with the skin. One point over the tendon was irradiated for 30 s, delivering 9 J (9 J/cm2). LED irradiation was performed once daily for 7 days, with the total energy delivered being 63 J. The tendons were surgically removed and expression of the HSP70 protein was calculated using semi-quantitative analyses of immunohistochemistry (HSCORE). Number of fibroblasts and amount of collagen were measured using histological and histochemical analyses. An increase in the mean HSCORE for HSP70, in the number of fibroblasts, and in the amount of collagen were found in the LED group compared with those in the tendinitis and control group (P ≤ 0.05). PBM therapy increased the expression of the HSP70, number of fibroblasts, and amount of collagen in the acute Achilles tendinitis in rats.

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Funding

This study was supported in part by the Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG) (APQ-01239-14) and the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) (finance code 001).

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Contributions

All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by André Nobre Evangelista, Lorena Pacheco de Oliveira Martins, Flávia Franciele dos Santos, Karine Beatriz Costa, Etel Rocha-Vieira, and Ana Paula Santos. Funding acquisition and supervision were performed by Murilo Xavier Oliveira, Thais Peixoto Gaiad, and Alex Sander Dias Machado. The first draft of the manuscript was written by André Nobre Evangelista, Lorena Pacheco de Oliveira Martins, and Flávia Franciele dos Santos, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Murilo Xavier Oliveira.

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The authors declare that they have no conflict of interest.

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The study was approved by the Ethics Committee on Animal Use of the Federal University of Jequitinhonha and Mucuri Valleys (certificate number: 007/2014).

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Evangelista, A.N., dos Santos, F.F., de Oliveira Martins, L.P. et al. Photobiomodulation therapy on expression of HSP70 protein and tissue repair in experimental acute Achilles tendinitis. Lasers Med Sci 36, 1201–1208 (2021). https://doi.org/10.1007/s10103-020-03155-3

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  • DOI: https://doi.org/10.1007/s10103-020-03155-3

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