Controlled Thermal Stimulation Using 980-nm Laser for Collagen Remodeling

Area of Science:

• Dermatology
• Biomedical Engineering
• Laser Physics

Background:

• Collagen is crucial for skin structure and function.
• Energy-based devices (radiofrequency, ultrasound) stimulate collagen but lack precise temperature control.
• Controlled thermal stimulation is needed for optimized collagen synthesis.

Purpose of the Study:

• To evaluate collagen synthesis induced by controlled thermal stimulation using a 980nm laser.
• To determine optimal laser parameters for safe and effective collagen induction in skin.

Main Methods:

• Ex vivo testing identified laser conditions (50°C-60°C).
• In vivo rat skin was irradiated with 2.5W, 980nm laser for 35s.
• Skin samples analyzed via histology and RT-qPCR at days 0, 14, and 28.

Main Results:

• Histology revealed a three-fold increase in dermal thickness and 15% increase in collagen density by day 28.
• RT-qPCR confirmed upregulation of FGF2, AKT, and COL3A1.
• Minimal inflammation observed, with no significant changes in IL-1β or IL-6, and decreased NF-κB expression.

Conclusions:

• Controlled 980nm laser stimulation effectively enhances collagen synthesis.
• The method promotes significant increases in dermal thickness and collagen density.
• Minimal inflammation indicates a safe profile for skin tissue, warranting further investigation with thermal sensors.