Published in:
01-11-2009 | Original Article
Effect of laser phototherapy on the release of fibroblast growth factors by human gingival fibroblasts
Authors:
Carla Andreotti Damante, Giorgio De Micheli, Sueli Patrícia Harumi Miyagi, Ilíria Salomão Feist, Márcia Martins Marques
Published in:
Lasers in Medical Science
|
Issue 6/2009
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Abstract
The effects of laser phototherapy on the release of growth factors by human gingival fibroblasts were studied in vitro. Cells from a primary culture were irradiated twice (6 h interval), with continuous diode laser [gallium–aluminum–arsenium (GaAlAs), 780 nm, or indium–gallium–aluminum–phosphide (InGaAlP),_660 nm] in punctual and contact mode, 40 mW, spot size 0.042 cm2, 3 J/cm2 and 5 J/cm2 (3 s and 5 s, respectively). Positive [10% fetal bovine serum (FBS)] and negative (1%FBS) controls were not irradiated. Production of keratinocyte growth factor (KGF) and basic fibroblast growth factor (bFGF) was quantified by enzyme-linked immunosorbent assay (ELISA). The data were statistically compared by analysis of variance (ANOVA) followed by Tukey’s test (P ≤ 0.05). The characterization of the cell line indicated a mesenchymal nature. KGF release was similar in all groups, while that of bFGF was significantly greater (1.49-times) in groups treated with infra-red laser. It was concluded that increased production of bFGF could be one of the mechanisms by which infra-red laser stimulates wound healing.