Bundle Gel Fibers with a Tunable Microenvironment for in Vitro Neuron Cell Guiding

Area of Science:

• Biomaterials Science
• Neuroscience
• Polymer Chemistry

Background:

• Developing effective scaffolds for in vitro neuron cell guidance is crucial for neural tissue engineering.
• Existing materials often lack the specific microstructural and mechanical properties required for optimal neuron cell behavior.

Purpose of the Study:

• To fabricate and characterize novel gel fibers with a bundle structure for guiding neuron cell elongation and differentiation.
• To investigate the influence of polymer blend ratios on the microstructure, topology, and stiffness of the gel fibers.
• To evaluate the potential of these gel fibers as cell culture scaffolds for neuronal progenitor cells.

Main Methods:

• Fabrication of bundle gel fibers using a microfluidic device system.
• Casting a phase-separating polymer blend solution of hydroxypropyl cellulose (HPC) and sodium alginate (Na-Alg).
• Characterization of gel fiber microstructure, topology, and stiffness based on varying HPC and Na-Alg ratios.
• Culturing and assessing the behavior of human-induced pluripotent-stem-cell-derived dopaminergic neuron progenitor cells on the fabricated scaffolds.

Main Results:

• Bundle gel fibers with tunable microstructure and stiffness were successfully fabricated.
• Higher concentrations of sodium alginate (Na-Alg) resulted in smaller microfibrils and increased stiffness.
• The gel fibers facilitated neuron cell elongation along the fiber axis.
• Neuronal differentiation of progenitor cells was achieved on the bundle gel scaffolds.

Conclusions:

• The developed bundle gel fibers offer a promising scaffold material for guiding neuron cell growth and differentiation in vitro.
• The microstructure and mechanical properties of the gel fibers can be controlled by adjusting the polymer blend ratio.
• These scaffolds provide an optimal microenvironment for neural cell culture, demonstrating significant potential for regenerative medicine applications.