Infrared low-level diode laser on inflammatory process modulation in mice: pro- and anti-inflammatory cytokines
Fukuda, Thiago Y. [UNIFESP]
Tanji, Maury M.
Silva, Suelen R.
Sato, Maria N.
Plapler, Helio [UNIFESP]
Is part ofLasers in Medical Science
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To evaluate the modulation of proinflammatory (interleukin-6, IL-6; tumor necrosis factor-alpha, TNF-alpha; and interferon-gamma, IFN-gamma) and anti-inflammatory cytokines (transforming growth factor-beta 1, TGF-beta 1) in the inflammation processes in vivo with low-level laser action, 50 isogenic mice were randomly distributed into three groups: control (no surgical procedure, n = 10), sham (surgical procedure with three standard cutaneous incisions, followed by an abdominal muscle incision and suture, n = 20), and laser (same procedure followed by laser exposure, n = 20). the sham group was divided into three subgroups: sham I (euthanasia and evaluation, 36 h after surgical procedure), sham II (euthanasia and evaluation, 60 h after surgical procedure), and sham III (euthanasia and evaluation, 84 h after surgical procedure). the laser group was also divided in three subgroups: laser I (a single laser session, 12 h after surgery), laser II (two laser sessions, 12 and 36 h after surgery), and laser III (three laser sessions, 12, 36, and 60 h after surgery). All animals in the laser groups received three points per session of continuous infrared laser (wavelength of 780 nm, power of 20 mW, fluency of 10 J/cm(2), exposure time of 20 s per point, and energy of 0.4 J). After euthanasia, spleen mononuclear cells were isolated and cultured for 48 h. Concentrations of IL-6, TNF-alpha, IFN-gamma, and TGF-beta 1 were obtained by enzyme-linked immunosorbent assay method. There was a significant difference between the IL-6 and TNF-alpha concentrations in the 60-and 84-h evaluations when the laser and sham groups were compared to the control group (p < 0.05), except for laser II in the TNF-alpha analysis (p > 0.05). the IFN-gamma concentration analysis showed a significant difference only in sham II when compared to the control group (p < 0.05). Thus, there was a modulatory effect of TNF-alpha and IFN-gamma in the laser group, particularly in the 60-h postoperative evaluation. There was no significant difference between the laser, sham, and control groups for TGF-beta 1 analysis (p > 0.05). the low-level laser application decreased the TNF-alpha and IFN-gamma release in vivo of spleen mononuclear cells in mice, especially after two exposure sessions. However, there was no modulation of the IL-6 and TGF-beta 1 release.
CitationLasers in Medical Science. London: Springer London Ltd, v. 28, n. 5, p. 1305-1313, 2013.
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