Effect of Laser Diode Light Irradiation on Growth Capability of Human Hair Follicle Dermal Papilla Cells
July 2017
TLDR Laser diode light boosts hair follicle cell growth and certain gene expressions.
The study investigated the effects of 808 nm laser diode light on the proliferation and gene expression of human hair follicle dermal papilla cells. Cells exposed to light doses higher than 0.5 J/cm² showed increased specific growth rates. Gene expression analysis revealed that while collagen type 1 (Col1), alkaline phosphatase (Alp), and versican (Vcan) did not increase, the sex determining region y-box 2 (Sox2) gene was up-regulated at 0.5 and 1 J/cm², and fibroblast growth factor 7 (Fgf7) gene increased at 0.5, 1, 2.5, and 4 J/cm². Higher doses did not affect gene expression, suggesting an optimal range for laser treatment efficacy.