Sound-based assembly of three-dimensional cellularized and acellularized constructs.

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Biophysics

Background:

• Osteoinductive materials like beta-Tricalcium phosphate (β-TCP) are crucial for bone regeneration.
• Efficient methods for assembling cells and biomaterials are needed for creating functional tissue constructs.
• Current techniques often struggle to achieve native tissue-like cell densities and structural complexity.

Purpose of the Study:

• To develop an accessible technique for rapid assembly of osteoinductive particles and cells.
• To engineer centimeter-scaled, three-dimensional cellularized and acellularized constructs.
• To investigate the role of biological building block connections in mineral deposition.

Main Methods:

• Utilized Faraday waves to generate hydrodynamic forces for particle and cell aggregation.
• Employed a layer-by-layer assembly procedure.
• Investigated the packing densities and structural properties of the assembled constructs.

Main Results:

• Achieved rapid, tight aggregation of beta-Tricalcium phosphate particles and human osteoblast spheroids.
• Fabricated centimeter-scaled, three-dimensional constructs with native tissue-like packing densities.
• Demonstrated that intimate cell-cell connections are essential for localized mineral deposition.

Conclusions:

• Faraday waves provide an accessible method for assembling biomaterials and cells.
• This technique enables the creation of complex, three-dimensional osteoinductive constructs.
• The study highlights the importance of cell-cell interactions in engineered tissues.