Collagen production in diabetic wounded fibroblasts in response to low-intensity laser irradiation at 660 nm.
BACKGROUND
Collagen type I (Col-I) is a major component of the extracellular matrix and is important in wound healing processes. Several studies have shown that low-intensity laser irradiation (LILI) biostimulates Col-I synthesis both in vitro and in vivo. This study aimed to determine if LILI affects collagen production and related cellular responses in an in vitro diabetic wounded fibroblast model.


METHODS
This study was performed on isolated human skin fibroblasts. Different cell models (normal and diabetic wounded) were used. Cells were irradiated with 5 J/cm(2) at a wavelength of 660 nm and incubated for 48 or 72 h. Nonirradiated cells (0 J/cm(2)) were used as controls. Cellular viability (Trypan blue exclusion test), morphology (bright-field microscopy), proliferation [VisionBlue™ quick cell proliferation assay and 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay], and Col-I (enzyme-linked immunoabsorbent assay) were assessed.


RESULTS
Diabetic wounded cells irradiated with 5 J/cm(2) at 660 nm showed a significant increase in cell migration, viability, proliferation, and collagen content.


CONCLUSIONS
This study shows that LILI stimulates Col-I synthesis in diabetic wound healing in vitro at 660 nm.
Laser Research Centre, Faculty of Health Sciences, University of Johannesburg, Doornfontein, South Africa.
Sandra M
SM
Ayuk
Nicolette N
NN
Houreld
Heidi
H
Abrahamse
D049109:Cell Proliferation; D002478:Cells, Cultured; D003094:Collagen / Q000378:metabolism*; D017719:Diabetic Foot / Q000150:complications / Q000532:radiotherapy*; D005347:Fibroblasts / Q000378:metabolism* / Q000528:radiation effects; D006801:Humans; D028022:Low-Level Light Therapy; D011829:Radiation Dosage; D012867:Skin / Q000166:cytology / Q000378:metabolism* / Q000528:radiation effects; D014945:Wound Healing / Q000528:radiation effects*
D003094:Collagen