Microcapsules with improved mechanical stability for hepatocyte culture

Area of Science:

• Biomaterials Engineering
• Hepatocyte Culture
• Bioartificial Organs

Background:

• Bioartificial liver assist devices (BLADs) utilize bioreactors with microencapsulated hepatocytes.
• Current microcapsule designs require improved mechanical stability for high perfusion rates.
• Optimizing microcapsule properties is key to successful BLAD applications.

Purpose of the Study:

• To investigate the impact of terpolymer molecular weight on microcapsule mechanical properties.
• To assess the effect of terpolymer molecular weight on encapsulated hepatocyte functions.
• To determine the suitability of modified microcapsules for BLADs.

Main Methods:

• Synthesis of six terpolymers with varying molecular weights (M(w)) via radical polymerization.
• Fabrication of microcapsules using terpolymers and methylated collagen.
• Evaluation of microcapsule mechanical properties, membrane thickness, and serum albumin permeability.
• Assessment of encapsulated hepatocyte functions: urea synthesis, albumin synthesis, and cytochrome P450 activity.

Main Results:

• Higher terpolymer M(w) significantly improved microcapsule mechanical properties.
• Terpolymer M(w) had minimal impact on capsule membrane thickness and albumin permeability.
• Encapsulated hepatocyte functions (urea, albumin synthesis, P450 activity) were not significantly affected by M(w).

Conclusions:

• Terpolymer molecular weight is a critical factor for enhancing microcapsule mechanical stability in BLADs.
• The developed microcapsules maintain optimal hepatocyte function, supporting their use in liver assist devices.
• This study provides a pathway for engineering more robust microcapsules for bioartificial liver applications.