Laser and LED phototherapies on angiogenesis

Area of Science:

• Biomedical Engineering
• Regenerative Medicine
• Photomedicine

Background:

• Angiogenesis, the formation of new blood vessels, is vital for effective wound healing.
• Research on light-emitting diode (LED) phototherapy's impact on angiogenesis, particularly in vivo, is limited.
• Understanding phototherapy's role in wound healing requires investigating different light sources and wavelengths.

Purpose of the Study:

• To histologically evaluate the effect of laser and LED phototherapy on angiogenesis in dorsal cutaneous wounds.
• To compare the efficacy of different wavelengths of laser (660 nm, 790 nm) and LED (700 nm, 530 nm, 460 nm) in promoting angiogenesis.
• To determine if light coherence influences the angiogenic response in a rodent wound healing model.

Main Methods:

• Excisional dorsal cutaneous wounds were created in Wistar rats.
• Animals were divided into six groups: control, laser (660 nm, 790 nm), and LED (700 nm, 530 nm, 460 nm).
• Phototherapy was administered every other day for 7 days; wounds were analyzed histologically on day 8 for blood vessel count.

Main Results:

• Green LED (530 nm), red LED (700 nm), 790 nm laser, and 660 nm laser significantly increased angiogenesis compared to the control group.
• Both laser and LED treatments demonstrated a positive effect on blood vessel formation.
• The study found no decisive role of light coherence in the observed angiogenic outcomes.

Conclusions:

• Both laser and LED phototherapy are effective in stimulating angiogenesis in cutaneous wounds.
• Wavelength and light source (laser vs. LED) are key factors in phototherapy for wound healing.
• Phototherapy presents a promising non-invasive approach to enhance wound healing by promoting neovascularization.