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Giulia Bruno¹, Giuseppina Iachetta¹, Luca Ceseracciu¹

¹Italian Institute of Technology, Plasmon Nanotechnologies, via Morego 30, 16163 Genova, Italy.

|April 20, 2026

Summary

This summary is machine-generated.

Substrate stiffness significantly impacts neuronal development. Soft substrates promote better adhesion and network connectivity in human induced pluripotent stem cell-derived neurons compared to stiff ones.

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Area of Science:

Biomedical Engineering
Neuroscience
Materials Science

Background:

Substrate properties critically influence neuronal cell behavior.
Polydimethylsiloxane (PDMS) is widely used in neural tissue engineering scaffolds.
Understanding mechanical cues is vital for optimizing neural cultures.

Purpose of the Study:

To investigate the effect of substrate stiffness on human induced pluripotent stem cell (hiPSC)-derived neuronal cultures.
To analyze neuronal adhesion, outgrowth, and network connectivity on soft versus stiff PDMS.
To determine the role of mechanical compliance in neuronal development.

Main Methods:

Culturing hiPSC-derived neurons on soft (∼12 kPa) and stiff (∼1.5 MPa) PDMS substrates.
Utilizing confocal imaging to assess Neural Cell Adhesion Molecule (NCAM) expression.
Employing network topology analysis to evaluate neuronal connectivity metrics.

Main Results:

Higher NCAM expression and enhanced neuronal adhesion/outgrowth were observed on soft PDMS at 10 days in vitro (DIV).
Soft PDMS substrates facilitated increased neuronal clustering and reduced path length.
Network topology analysis revealed higher small-worldness on soft PDMS, indicating more efficient neural network connectivity.

Conclusions:

Substrate compliance is a crucial factor in promoting neuronal development and network formation.
Soft PDMS scaffolds offer superior support for hiPSC-derived neuronal cultures compared to stiff ones.
These findings provide essential insights for designing advanced scaffolds in neural engineering applications.