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Title: Low-level laser therapy promotes proliferation and invasion of oral squamous cell carcinoma cells
Authors: Henriques, Águida Cristina Gomes
Ginani, Fernanda
Oliveira, Ruth Medeiros
Keesen, Tatjana Souza Lima
Barboza, Carlos Augusto Galvão
Rocha, Hugo Alexandre Olivera
Castro, Jurema Freire Lisboa de
Coletta, Ricardo Della
Freitas, Roseana de Almeida
Keywords: Cell cycle;Cell proliferation;Flow cytometry;Low-level laser therapy;Squamous cell carcinoma
Issue Date: 2014
Citation: HENRIQUES, Águida Cristina Gomes et al. Low-level laser therapy promotes proliferation and invasion of oral squamous cell carcinoma cells. Lasers in Medical Science, v. 29, n. 4, p. 1385-1395, 2014.
Portuguese Abstract: Low-level laser therapy (LLLT) has been shown to be effective in promoting cell proliferation. There is speculation that the biostimulatory effect of LLLT causes undesirable enhancement of tumor growth in neoplastic diseases since malignant cells are more susceptible to proliferative stimuli. This study evaluated the effects of LLLT on proliferation, invasion, and expression of cyclin D1, E-cadherin, β-catenin, and MMP-9 in a tongue squamous carcinoma cell line (SCC25). Cells were irradiated with a diode laser (660 nm) using two energy densities (0.5 and 1.0 J/cm(2)). The proliferative potential was assessed by cell growth curves and cell cycle analysis, whereas the invasion of cells was evaluated using a Matrigel cell invasion assay. Expression of cyclin D1, E-cadherin, β-catenin, and MMP-9 was analyzed by immunofluorescence and flow cytometry and associated with the biological activities studied. LLLT induced significantly the proliferation of SCC25 cells at 1.0 J/cm(2), which was accomplished by an increase in the expression of cyclin D1 and nuclear β-catenin. At 1.0 J/cm(2), LLLT significantly reduced E-cadherin and induced MMP-9 expression, promoting SCC25 invasion. The results of this study demonstrated that LLLT exerts a stimulatory effect on proliferation and invasion of SCC25 cells, which was associated with alterations on expression of proteins studied.
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