Extracellular matrix cues modulate Schwann cell morphology, proliferation, and protein expression

Area of Science:

• Biomaterials Science
• Cell Biology
• Neuroscience

Background:

• Peripheral nerve injuries (PNIs) necessitate complex cellular and extracellular matrix (ECM) signaling for effective regeneration and functional recovery.
• Schwann cells (SCs), the primary glial cells in the peripheral nervous system (PNS), are crucial for nerve regeneration, exhibiting a remarkable ability to adapt their phenotype post-injury to aid healing.

Purpose of the Study:

• To investigate the intricate mechanisms governing the interaction between the ECM and SCs.
• To determine how specific ECM cues influence and regulate the phenotype of SCs.

Main Methods:

• SCs were cultured on polydimethylsiloxane (PDMS) substrates with varying Young's moduli, coated with ECM proteins.
• Cellular responses including spreading area, proliferation, cell and nuclear shape, and c-Jun expression were analyzed.
• Microcontact printing was used to precisely control cell-adhesive areas, geometry, and SC spreading.

Main Results:

• Substrates with a stiffness of 8.67 kPa coated with laminin significantly promoted the highest expression of c-Jun, a marker for regenerative SC phenotype.
• Controlled cell spreading area and cellular elongation via microcontact printing modulated c-Jun expression, either promoting or downregulating it.

Conclusions:

• This study elucidates the significant interplay between ECM cues and SC phenotype.
• The findings offer a potential strategy for enhancing PNS regeneration through targeted cellular therapies.