3D cell sheet structure augments mesenchymal stem cell cytokine production

Area of Science:

• Regenerative Medicine
• Biomaterials Science
• Cell Biology

Background:

• Mesenchymal stem cells (MSCs) are crucial for tissue regeneration via secreted paracrine factors.
• Three-dimensional (3D) microenvironments can enhance MSC paracrine function.
• Scaffold-free cell sheet technology offers a novel 3D platform for MSC cultivation.

Purpose of the Study:

• To explore scaffold-free cell sheet technology as a 3D platform for enhancing MSC therapeutic potency.
• To investigate the structural and molecular changes in MSCs cultured in a 3D cell sheet format.
• To evaluate the impact of 3D cell sheet formation on MSC-secreted regenerative factors.

Main Methods:

• Cultured MSCs on temperature-responsive dishes to form 2D monolayers.
• Harvested cell sheets by reducing temperature, inducing spontaneous contraction and 3D construct formation.
• Analyzed changes in cell morphology, cytoskeleton, gene expression, and protein secretion.

Main Results:

• Scaffold-free cell sheets underwent a 2.4-fold diameter reduction and 8.0-fold thickness increase, forming a 3D tissue-like construct.
• The 2D-to-3D transition reorganized the actin cytoskeleton and altered cell morphology.
• 3D culture significantly upregulated genes for cell interaction (β-catenin, integrin β1, connexin 43) and regenerative cytokines (VEGF, HGF, IL-10).
• VEGF secretion per MSC increased 2.1-fold in 3D cell sheets compared to 2D cultures.

Conclusions:

• Scaffold-free cell sheet technology effectively generates 3D MSC constructs.
• 3D cell sheet formation enhances MSCs' molecular profile for tissue regeneration.
• This 3D platform demonstrates potential for improving MSC therapeutic efficacy.