Abstract
The use of low-level laser for lung inflammation treatment has been evidenced in animal studies as well as clinical trials. The laser action mechanism seems to involve downregulation of neutrophil chemoattractants and transcription factors. Innate immune responses against microorganisms may be mediated by toll-like receptors (TLR). Intestinal ischemia and reperfusion (i-I/R) lead to bacterial product translocation, such as endotoxin, which consequently activates TLRs leading to intestinal and lung inflammation after gut trauma. Thus, the target of this study was to investigate the role of TLR activation in the laser (660 nm, 30 mW, 67.5 J/cm2, 0.375 mW/cm2, 5.4 J, 180 s, and spot size with 0.08 cm2) effect applied in contact with the skin on axillary lymph node in lung inflammation induced by i-I/R through a signaling adaptor protein known as myeloid differentiation factor 88 (MyD88). It is a quantitative, experimental, and laboratory research using the C57Bl/6 and MyD88−/− mice (n = 6 mice for experimental group). Statistical differences were evaluated by ANOVA and the Tukey-Kramer multiple comparisons test to determine differences among groups. In order to understand how the absence of MyD88 can interfere in the laser effect on lung inflammation, MyD88−/− mice were treated or not with laser and subjected to occlusion of the superior mesenteric artery (45 min) followed by intestinal reperfusion (4 h). In summary, the laser decreased the MPO activity and the lung vascular permeability, thickened the alveolar septa, reduced both the edema and the alveolar hemorrhage, as well as significantly decreased neutrophils infiltration in MyD88-deficient mice as well in wild-type mice. It noted a downregulation in chemokine IL-8 production as well as a cytokine IL-10 upregulation in these animals. The results also evidenced that in absence of IL-10, the laser effect is reversed. Based on these results, we suggest that the beneficial effect of laser in acute lung injury after i-I/R is dependent on the secretion of IL-10 and independent of the TLR/MyD88 signaling.
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Research funder: Research Support Foundation of São Paulo State (FAPESP); Grant number: 2008/08838/5. There is no conflict of interest with FAPESP.
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The FAPESP is an agency of the state of São Paulo that finances research projects with buying from equipment and reagents needed for research. In this manuscript, the role of funding source was finance purchases of MyD88 knockout animals and reagents for other experimental studies.
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The animals’ housing and use were in accordance with the guidelines of the Committee on Care and Use of Laboratory Animal Resources of the University of São Paulo, Institute of Biomedical Sciences, which are similar to the guidelines of the Canadian Council of Animal Care.
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The experiments were done with mice.
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Carvalho, J.L., Britto, A., de Oliveira, A.P.L. et al. Beneficial effect of low-level laser therapy in acute lung injury after i-I/R is dependent on the secretion of IL-10 and independent of the TLR/MyD88 signaling. Lasers Med Sci 32, 305–315 (2017). https://doi.org/10.1007/s10103-016-2115-4
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DOI: https://doi.org/10.1007/s10103-016-2115-4