Toward Morphologically Relevant Extracellular Matrix in Vitro Models: 3D Fiber Reinforced Hydrogels.

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Cell Biology

Background:

• The extracellular matrix (ECM) provides crucial physical and chemical cues for cell health and tissue function.
• Current 3D cell culture matrices, typically single-phase hydrogels, cannot replicate the complex morphology and mechanics of native ECM.
• Studying cell behavior within intricate ECM-like structures is essential for advancing tissue engineering.

Purpose of the Study:

• To develop a novel fiber-reinforced composite hydrogel system for 3D cell culture.
• To investigate the influence of combined morphological and mechanical properties on cell behavior.
• To create a platform for studying cell-matrix interactions in a biomimetic environment.

Main Methods:

• A continuous hybrid manufacturing process combining far-field electrospinning and gravity-assisted droplet-based hydrogel addition.
• Fabrication of fiber-reinforced composite hydrogels with controlled fiber deposition.
• Embedding cell-laden hydrogel components into the fibrous matrix.
• Assessing cell viability and morphology within the engineered hydrogels over 8 days.

Main Results:

• The developed process successfully created fiber-reinforced composite hydrogels.
• The addition of fibers marginally increased the hydrogel's elastic modulus.
• Embedded cells remained viable for 8 days.
• Cells in proximity to fibers spread and aligned along them, while those without fiber contact formed spheroidal clusters.

Conclusions:

• The fiber-reinforced hydrogels effectively mimic aspects of the native ECM's structural complexity.
• The composite hydrogels demonstrate the ability to direct cell behavior through morphological cues provided by the fibers.
• This technology offers a promising new tool for 3D cell culture and tissue engineering research.