Red light accelerates the formation of a human dermal equivalent

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Photomedicine

Background:

• Developing substitutes for natural tissues is crucial in tissue engineering.
• Type I collagen is a promising biomaterial for creating dermal equivalents.
• Photobiomodulation may enhance cell proliferation and differentiation.

Purpose of the Study:

• To create a dermal equivalent in vitro using a collagen-based scaffold.
• To evaluate the effects of red light photobiomodulation on cells within the scaffold.
• To assess the potential of this system for reconstructing human dermal tissue.

Main Methods:

• Prepared a collagen sponge from hydrolyzed porcine serous collagen.
• Characterized the sponge's porosity, pore size, and absorption properties.
• Cultured Vero cells and human dermal cells on the scaffold and evaluated cytotoxicity.
• Irradiated cell cultures with 630 nm red light at 30 J/cm².
• Assessed cell differentiation and extracellular matrix secretion.

Main Results:

• The collagen sponge exhibited favorable properties: 95% porosity, 44 µm median pore size, and high culture medium absorption (95%).
• The sponge showed no cytotoxicity to Vero cells.
• Red light (630 nm) induced cellular photobiomodulation in both monolayer and 3D dermal equivalent cultures.
• Cells cultured on the scaffold demonstrated differentiation and extracellular matrix secretion.

Conclusions:

• The developed collagen sponge serves as an effective polymeric matrix for cell support in tissue engineering.
• Photobiomodulation with 630 nm red light enhances cellular activity within the collagen scaffold.
• This combined approach is efficient for producing reconstructed human dermal equivalents in vitro.