Neurite outgrowth at the biomimetic interface

Area of Science:

• Biomaterials Science
• Neuroscience
• Tissue Engineering

Background:

• Neuronal growth and directed axon guidance are critical for neural tissue engineering.
• The cellular microenvironment provides complex cues that influence neuronal behavior.
• Deconstructing these cues is essential for developing effective neural regeneration strategies.

Purpose of the Study:

• To isolate and investigate the topographical information from cells as a guidance cue for neurons.
• To determine the capacity of biomimetic materials presenting cell-derived topographies to guide neuronal growth.
• To compare the guidance effects of different cell types' topographies and bioinspired designs.

Main Methods:

• Generated replica materials mimicking the topographies of oriented astrocytes (ACs), endothelial cells (ECs), and Schwann cells (SCs).
• Created computer-aided design (CAD) materials inspired by cell contours (bioinspired-CAD) with distinct topographies and anisotropies.
• Assessed the guidance of dorsal root ganglia (DRG) cells and neurites on these engineered materials.

Main Results:

• Both replica and bioinspired-CAD materials with distinct topographies were sufficient to guide neurons.
• Bioinspired-CAD materials with anisotropic features and 90-degree edges induced the most directed DRG cell and neurite response.
• Schwann cell (SC) bioinspired-CAD materials resulted in the strongest DRG alignment, followed by AC and EC bioinspired-CAD materials.

Conclusions:

• The topographical features of anisotropic tissue structures are sufficient to guide neuronal growth.
• Bioinspired designs, particularly those with specific edge geometries, can optimize topographical guidance.
• This research provides insights into feature dimensions, morphology, and guidepost hypotheses for neural engineering.