Dynamically changing extracellular matrix stiffness drives Schwann cell phenotype

Area of Science:

• Biomaterials Science
• Neuroscience
• Cell Biology

Background:

• Schwann cells (SCs) are vital for peripheral nervous system (PNS) function and regeneration after injury.
• SCs respond to physical and chemical cues to aid axonal repair and extracellular matrix (ECM) remodeling.
• The impact of dynamic, time-dependent changes in the ECM microenvironment on SCs post-injury is not well understood.

Purpose of the Study:

• To investigate Schwann cell (SC) responses to temporally changing mechanical properties of the microenvironment.
• To utilize a tunable biomaterial to mimic the dynamic ECM changes following peripheral nervous system (PNS) trauma.
• To understand how dynamic mechanical cues influence SC phenotype and plasticity for improved regenerative therapies.

Main Methods:

• Development of a UV-tunable polydimethylsiloxane (PDMS) biomaterial with dynamically changing stiffness.
• Culturing Schwann cells (SCs) on static (stiff/soft) and dynamic stiffness-changing PDMS substrates.
• Analysis of SC phenotype markers, including stress fibers, YAP expression, and c-Jun production.

Main Results:

• SCs cultured on the dynamic biomaterial exhibited increased stress fibers compared to static controls.
• Elevated YAP expression was observed in SCs on the dynamic substrate.
• Fluctuations in c-Jun production were noted in SCs responding to the time-varying mechanical environment.

Conclusions:

• Dynamic changes in substrate stiffness significantly influence Schwann cell (SC) phenotype and behavior.
• Mechanically tunable biomaterials can effectively model the temporal microenvironmental shifts post-PNS injury.
• This approach offers a promising avenue for developing advanced therapeutic strategies for PNS regeneration.