A novel three-dimensional model system for keloid study: organotypic multicellular scar model

Area of Science:

• Biomedical Engineering
• Dermatology
• Tissue Engineering

Background:

• Keloids are abnormal scars characterized by excessive extracellular matrix deposition.
• Understanding the keloid microenvironment is crucial for developing effective treatments.
• Existing models often fail to fully replicate the complex in vivo conditions of keloid tissue.

Purpose of the Study:

• To develop and validate a three-dimensional (3D) organotypic multicellular spheroid scar model.
• To mimic the human keloid tissue microenvironment for research purposes.
• To assess the utility of this model for studying keloid pathogenesis and therapeutic responses.

Main Methods:

• Development of a 3D organotypic multicellular spheroid model using keloid tissues.
• Histological evaluation of cellularity and TUNEL assay for apoptosis.
• Immunohistochemistry to assess expression of transforming growth factor-β (TGF-β), collagen I, collagen III, elastin, fibronectin, matrix metalloproteinase-2, and matrix metalloproteinase-9.
• Treatment of spheroids with triamcinolone acetonide to evaluate therapeutic effects.

Main Results:

• The keloid spheroid model maintained cell viability and morphology for up to 7 days ex vivo.
• High expression levels of collagen I and TGF-β were retained in the spheroids for up to 7 days.
• Ex vivo treatment with triamcinolone acetonide significantly reduced collagen I, collagen III, elastin, and fibronectin expression, mirroring clinical outcomes.

Conclusions:

• The 3D organotypic multicellular spheroid keloid culture effectively mimics key characteristics of human keloid tissues.
• This model retains biological activity and responsiveness to therapeutic agents like triamcinolone acetonide.
• The developed model provides a valuable platform for investigating keloid pathogenesis and screening potential therapeutic strategies.