Effects of Low-Level Gallium-Aluminum-Arsenide Laser Therapy on Human Dermal Fibroblast Proliferation, ATP, and ROS...

Area of Science:

• Biomedical Engineering
• Cell Biology
• Photomedicine

Background:

• Fibroblasts are critical for tissue repair and wound healing.
• Low-level laser therapy (LLLT) is explored for its therapeutic potential in regenerative processes.
• Understanding cellular responses to specific laser parameters is essential for optimizing treatment.

Purpose of the Study:

• To investigate the impact of continuous Gallium-Aluminum-Arsenide (Ga-Al-As) laser irradiation on human fibroblast cells.
• To evaluate the effects of different laser output powers (10 mW and 27 mW) and energy densities on fibroblast proliferation, adenosine triphosphate (ATP) production, and reactive oxygen species (ROS) generation.
• To determine optimal LLLT parameters for enhancing fibroblast activity.

Main Methods:

• Human fibroblast cells were cultured and exposed to an 830 nm Ga-Al-As laser at 10 mW and 27 mW with varying energy densities.
• Cell proliferation was quantified using the MTT assay 24 hours post-irradiation.
• ATP levels and ROS production were measured using microplate reader assays.

Main Results:

• A significant increase in fibroblast proliferation was observed at 10 mW and 3.78 J/cm² (0.79±0.07) compared to controls (0.51±0.05).
• ATP production was markedly elevated in the 10 mW group at 3.78 J/cm² (15,404±819) versus controls (115±51).
• The 27 mW group showed reduced proliferation at 10 J/cm², and no significant differences in ROS levels were found across groups.

Conclusions:

• LLLT with a 10 mW, 830 nm Ga-Al-As laser at 3.78 J/cm² effectively promotes fibroblast proliferation.
• This specific LLLT protocol significantly enhances ATP synthesis in fibroblasts.
• The findings suggest potential therapeutic applications of optimized LLLT in wound healing and tissue regeneration.