Tissue Engineering Scaffolds and Mechanical Properties

Scaffolds in tissue engineering serve as three-dimensional frameworks that mimic the extracellular matrix, offering mechanical support and guiding cell attachment, proliferation and differentiation. Material choice—ranging from synthetic polymers such as polylactic acid and polycaprolactone to natural biopolymers like chitosan and collagen or composites incorporating hydroxyapatite—directly influences scaffold stiffness, degradation rate and bioactivity. Fabrication techniques including electrospinning, thermally induced phase separation, nonsolvent-induced phase separation, three-dimensional printing and melt electrowriting allow precise regulation of pore size, interconnectivity and fibre orientation. Mechanical properties such as elastic modulus, tensile strength and viscoelasticity play a pivotal role in dictating mechanotransduction pathways and ensuring structural integrity under physiological loads. By optimising these properties, researchers aim to accelerate the repair of bone, cartilage and vascular tissues, addressing global challenges in regenerative medicine and advancing clinical translation through scalable manufacturing and regulatory compliance.

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Research from all publishers

Recent advances in electrospun hybrid scaffolds have combined a synthetic polymer core of polylactic acid with chitosan shells to create microfibrous networks exhibiting reinforced mechanical stability in both dry and wet environments. Controlled plasma treatments further enhance polymer–biopolymer adhesion, yielding scaffolds with elevated tensile strength and elastic modulus. These hybrid structures support the mineralisation process and promote osteogenic differentiation of pre-osteoblastic cell lines, highlighting their promise for bone defect repair.

Nonsolvent-induced phase separation has been employed to fabricate polycaprolactone scaffolds embedded with varying concentrations of nanohydroxyapatite, yielding a range of porosity levels and pore size distributions at different thicknesses. Mechanical testing correlates higher ceramic content with increased compressive yield strength and anisotropic stiffness, while micro-computed tomography and scanning electron microscopy confirm uniformly distributed microporous morphologies. This approach enables bespoke scaffold designs tuned to specific load-bearing requirements in bone tissue engineering.

Bilayer scaffolds produced by thermally induced phase separation integrate two layers of poly-L-lactic acid supplemented with hydroxyapatite, each engineered to distinct pore sizes to mimic cartilage and subchondral bone architectures. The dual-layer topology facilitates spatially directed differentiation of mesenchymal stromal cells and articular chondrocytes, supporting extracellular matrix deposition and sulphated glycosaminoglycan synthesis. The constructs exhibit high cytocompatibility and mechanical resilience suitable for osteochondral defect repair.

Tissue Engineering Scaffolds and Mechanical Properties publication trend

The graph below shows the total number of articles in tissue engineering scaffolds and mechanical properties across all publications each year (not limited to Nature Index journals).

Technical terms

Scaffold: A three-dimensional structure providing mechanical support and guidance for cell growth.

Porosity: The proportion of void space within a scaffold, influencing cell infiltration and nutrient diffusion.

Elastic modulus: A measure of a material’s stiffness under applied stress.

Electrospinning: A fabrication technique using electrostatic forces to produce fine polymer fibres.

Phase separation: A method to induce polymer–solvent demixing, creating interconnected pores in scaffolds.

Biocompatibility: The ability of a material to elicit an appropriate cellular response without adverse effects.

Hydroxyapatite: A calcium phosphate bioceramic commonly incorporated into scaffolds to enhance osteoconductivity.

References

1. Improvement of Osteogenic Differentiation of Mouse Pre-Osteoblastic MC3T3-E1 Cells on Core–Shell Polylactic Acid/Chitosan Electrospun Scaffolds for Bone Defect Repair. International Journal of Molecular Sciences (2024).
2. Microstructural Characterization of PCL-HA Bone Scaffolds Based on Nonsolvent-Induced Phase Separation. ACS Omega (2023).
3. The Phenotype of Mesenchymal Stromal Cell and Articular Chondrocyte Cocultures on Highly Porous Bilayer Poly-L-Lactic Acid Scaffolds Produced by Thermally Induced Phase Separation and Supplemented with Hydroxyapatite. Polymers (2024).