Hydrogel viscoelasticity modulates cell nascent extracellular matrix deposition

Area of Science:

• Biomaterials Science
• Cell Biology
• Tissue Engineering

Background:

• Polymeric hydrogels mimic native tissue extracellular matrix (ECM) mechanical properties.
• Investigating cell responses to time-dependent ECM mechanics is crucial.
• Cellular remodeling via nascent ECM deposition is a key, yet understudied, factor in hydrogel environments.

Purpose of the Study:

• To develop a hydrogel system for independent control of viscous and elastic properties.
• To investigate the role of nascent ECM deposition in cell-hydrogel interactions under varying mechanical conditions.
• To understand how hydrogel viscosity influences cell-mediated ECM remodeling.

Main Methods:

• Development of an interpenetrating polymer network hydrogel.
• Independent tuning of hydrogel viscosity and elasticity.
• Culturing cells on hydrogels with controlled mechanical properties.
• Quantifying nascent ECM deposition and hydrogel remodeling.

Main Results:

• Cells cultured on high-viscosity hydrogels deposited significantly more nascent ECM.
• Increased nascent ECM deposition correlated with enhanced hydrogel remodeling.
• Nascent ECM deposition on high-viscosity hydrogels was independent of intracellular contractility.

Conclusions:

• Hydrogel viscosity directly influences nascent ECM deposition by cells.
• Nascent ECM plays a critical role in cell-hydrogel mechanical communication.
• Findings provide new insights into cell-matrix interactions and hydrogel design for regenerative medicine.