The low-level laser on acute myositis in rats

Carvalho, Ana Flávia Machado de; Sousa, Paula Fernanda Batista de; Feitosa, Maura Cristina Porto; Coelho, Nayana Pinheiro Machado de Freitas; Barros, Esmeralda Maria Lustosa; Feitosa, Valrian Campos; Arisawa, Emília Ângela Lo Schiavo

doi:10.1590/s0102-865020150120000003

Cited by 9 publications

(3 citation statements)

References 16 publications

(11 reference statements)

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“…LLLT has positive effects on muscle tissue and muscle repair, because it reduces pain [25], modulates the inflammatory process [26][27][28], increases the formation of new myofibrils [29], causes angiogenesis [29,30], increases the number of cells, and activates satellite cells [29].…”

Section: Discussionmentioning

confidence: 99%

Pulsed low-level infrared laser alters mRNA levels from muscle repair genes dependent on power output inWistarrats

Trajano¹,

Trajano²,

Thomé³

et al. 2017

Laser Phys. Lett.

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Satellite cells are present in skeletal muscle functioning in the repair and regeneration of muscle injury. Activation of these cells depends on the expression of myogenic factor 5 (Myf5), myogenic determination factor 1(MyoD), myogenic regulatory factor 4 (MRF4), myogenin (MyoG), paired box transcription factors 3 (Pax3), and 7 (Pax7). Low-level laser irradiation accelerates the repair of muscle injuries. However, data from the expression of myogenic factors have been controversial. Furthermore, the effects of different laser beam powers on the repair of muscle injuries have been not evaluated. The aim of this study was to evaluate the effects of low-level infrared laser at different powers and in pulsed emission mode on the expression of myogenic regulatory factors and on Pax3 and Pax7 in injured skeletal muscle from Wistar rats. Animals that underwent cryoinjury were divided into three groups: injury, injury laser 25 Mw, and injury laser 75 mW. Low-level infrared laser irradiation (904 nm, 3 J cm −2 , 5 kHz) was carried out at 25 and 75 mW. After euthanasia, skeletal muscle samples were withdrawn and the total RNA was extracted for the evaluation of mRNA levels from the MyoD, MyoG, MRF4, Myf5, Pax3, and Pax7 gene. Pax 7 mRNA levels did not alter, but Pax3 mRNA levels increased in the injured and laser-irradiated group at 25 mW. MyoD, MyoG, and MYf5 mRNA levels increased in the injured and laser-irradiated animals at both powers, and MRF4 mRNA levels decreased in the injured and laser-irradiated group at 75 mW. In conclusion, exposure to pulsed low-level infrared laser, by power-dependent effect, could accelerate the muscle repair process altering mRNA levels from paired box transcription factors and myogenic regulatory factors.

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Section: Discussionmentioning

confidence: 99%

Pulsed low-level infrared laser alters mRNA levels from muscle repair genes dependent on power output inWistarrats

Trajano¹,

Trajano²,

Thomé³

et al. 2017

Laser Phys. Lett.

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“…Also, significant edema regression (P = 0.040) in the MT group achieved similar results in rats. 12 Moreover, the positive effects of laser therapy have been seen in a few cases of dermatomyositis. 13 HILT which includes higher intensity laser radiation is a new, painless, and powerful modality and it has shown significant results concerning pain reduction in the osteoarthritis and other musculoskeletal disorders.…”

Section: Discussionmentioning

confidence: 99%

The Effect of High-Intensity Laser Therapy on Trapezius Focal Myositis: A Rare Case Report

Ghanbarnasab

Nejati

Moeinoddin³

et al. 2019

J Lasers Med Sci

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Focal myositis (FM) is a rare inflammatory myopathy characterized by a painful swelling of a skeletal muscle. The lower limb is the most common site for FM, but it has also been reported in the abdomen, forearm, neck, and tongue musculature. Some conservative treatments such as non-steroidal anti-inflammatory drugs, physiotherapy, and steroids can relieve muscle pain and its minor complications. This report describes a patient who had shoulder pain and was diagnosed with FM in the left trapezius muscle with an excellent response to high-intensity laser therapy.

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“…To induce myositis, after manual epication of the dorsal region of the right hind limb of the animal, followed by asepsis with polyvinyliodopyrrolidone (PVPI), 0.2 ml of 1% acetic acid with hypodermic needle and insulin syringe were injected into the right gastrocnemius muscle 11 .…”

Section: Induction Of Experimental Injurymentioning

confidence: 99%

Topical action of Buriti oil (Mauritia flexuosa L.) in myositis induced in rats

Barbosa¹,

Silva²,

Barros³

et al. 2017

Acta Cir. Bras.

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Results: The neutrophil number there was statistically significant difference, after 7 and 14 days, between groups C and MI (p <0.001) (p<0.01). The group MT there was a significant difference in relation to MI group in both experimental times with (p<0.001). The number of fibroblasts in the 14 days showed that when comparing the groups M and MT the differences were also significant (p<0.001). As for the DLL, in 7 days, there was a significant difference between group C and MI group (p <0.001). When considering the MT group, there was a significant difference in relation to the MI group (p <0.001). Conclusion:The extract of Mauritia flexuosa L. leaves lessened acute and chronic inflammation, increased fibroblast proliferation and reduced macroscopically edema.

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The low-level laser on acute myositis in rats

Cited by 9 publications

References 16 publications

Pulsed low-level infrared laser alters mRNA levels from muscle repair genes dependent on power output inWistarrats

Pulsed low-level infrared laser alters mRNA levels from muscle repair genes dependent on power output inWistarrats

The Effect of High-Intensity Laser Therapy on Trapezius Focal Myositis: A Rare Case Report

Topical action of Buriti oil (Mauritia flexuosa L.) in myositis induced in rats

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