Dynamic alterations of hepatocellular function by on-demand elasticity and roughness modulation.

Area of Science:

• Biomaterials Science
• Cell Biology
• Tissue Engineering

Background:

• Cell culture substrates traditionally offer static mechanical environments.
• Dynamic control over substrate properties is crucial for mimicking in vivo conditions.
• Understanding cell mechanosensing requires tunable material platforms.

Purpose of the Study:

• To develop and characterize temperature-responsive cell culture substrates.
• To investigate the impact of dynamic substrate softening on hepatocellular function.
• To determine the role of mechanical priming in substrate-induced cellular responses.

Main Methods:

• Fabrication of temperature-responsive polymer substrates.
• Characterization of material properties (bulk modulus, surface roughness) via temperature changes.
• Cell culture of hepatocytes on dynamic substrates.
• Assessment of hepatocellular function (e.g., albumin secretion, CYP activity) and morphology.
• Quantification of mechanical priming effects through controlled pre-stiffening.

Main Results:

• Substrates exhibited reversible bulk softening and surface roughening upon temperature change.
• Hepatocellular function was significantly altered following substrate softening.
• The degree of functional alteration was dependent on the duration and stiffness of prior mechanical priming.
• Dynamic material transitions influenced cell-material interactions and cellular phenotype.

Conclusions:

• Temperature-responsive substrates offer a novel platform for dynamic cell culture.
• Temporally controlled mechanical cues from substrates modulate hepatocellular function.
• Mechanical history of cells plays a critical role in their response to dynamic microenvironments.