A decellularized matrix enriched collagen microscaffold for a 3D in vitro liver model

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Regenerative Medicine

Background:

• Developing functional liver tissue requires scaffolds that mimic the native three-dimensional (3D) structure and extracellular matrix (ECM) composition.
• Existing liver tissue engineering approaches face challenges in preserving hepatocyte functionality and native matrix characteristics.

Purpose of the Study:

• To design and validate an alginate-based platform for liver tissue engineering using decellularized matrices and collagen.
• To assess the scaffold's ability to support liver cell proliferation, function, and drug-induced toxicity studies.

Main Methods:

• Scaffold fabrication using alginate, decellularized matrices (skin and liver), and exogenous collagen.
• Characterization via scanning electron microscopy (SEM) and fluorescence microscopy.
• Evaluation of hepatocellular carcinoma (HuH7) cell proliferation and primary rat hepatocyte functionality.
• Assessment of drug-induced cytochrome P450 (CYP) activation (CYP1A1 gene induction).

Main Results:

• Decellularized skin scaffolds with collagen enhanced HuH7 cell proliferation.
• Addition of exogenous collagen to liver matrix significantly improved hepatocyte functionality.
• The platform successfully modeled drug-induced toxicity, showing significant CYP1A1 gene induction.
• The developed microscaffold system offers advantages in sample volume, throughput, and cost-effectiveness.

Conclusions:

• Alginate-based scaffolds incorporating decellularized matrices and collagen are effective for liver cell culture and function.
• This platform shows potential for efficient drug-induced liver toxicity screening using primary hepatocytes.
• The study highlights the need for tailored matrix composition for healthy versus cirrhotic liver models.