Patterned and Gradient Conductive Hydrogel for Regulating Nerve Cell Behavior.

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Neuroscience

Background:

• Developing multifunctional hydrogel scaffolds with gradient conductivity and patterned morphologies to mimic the extracellular matrix and modulate neuronal behavior is challenging.
• Existing methods lack precise control over conductivity gradients and microstructural patterning within hydrogels.

Purpose of the Study:

• To develop a conductive, morphology-gradient hydrogel using an electrophoresis-based strategy.
• To precisely control graphene oxide (GO) distribution and patterned morphologies within a polyisocyanopeptide (PIC) hydrogel matrix.
• To investigate the impact of gradient conductivity and morphology on neuronal cell behavior.

Main Methods:

• Utilized a thermosensitive polyisocyanopeptide (PIC) hydrogel as the matrix.
• Employed an electrophoresis-based strategy for graphene oxide (GO) nanosheet migration and gradient formation.
• Controlled GO distribution and patterned morphologies by adjusting electric field strength and electrode configuration.
• Cultured SH-SY5Y cells on the gradient hydrogels to assess cellular response.

Main Results:

• Successfully developed a conductive hydrogel with a continuous gradient of conductivity, microstructure, and fiber alignment.
• Demonstrated precise control over GO distribution and patterned morphologies through electrophoresis.
• Observed SH-SY5Y cell alignment along the conductivity gradient.
• Found that higher GO regions promoted greater cell circularity and smaller cell areas compared to low-GO regions and controls.

Conclusions:

• This work provides new insights into designing programmable multigradient conductive hydrogels.
• The developed hydrogel scaffolds show strong potential for advancing neural tissue engineering.
• The electrophoresis-based strategy offers a versatile method for creating complex hydrogel architectures for regenerative medicine.