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Modulation of Huh7.5 spheroid formation and functionality using modified PEG-based hydrogels of different stiffness
Bae Hoon Lee1, Myung Hee Kim1, Jae Ho Lee1
1School of Materials Science and Engineering, Nanyang Technological University, Singapore, Singapore.
Plos One
|February 19, 2015
Summary
Researchers tuned hydrogel stiffness to control liver cell spheroids. Softer hydrogels promoted larger spheroids and enhanced liver-like functions, offering a model for drug screening.
Area of Science:
- Biomaterials Engineering
- Tissue Engineering
- Cellular Mechanobiology
Background:
- Cell microenvironment stiffness influences cellular behaviors like differentiation, viability, and proliferation.
- Tunable mechanical stiffness is a key feature for smart scaffold design in tissue engineering.
Purpose of the Study:
- To synthesize fibrinogen-modified poly(ethylene glycol)-diacrylate (PEG-DA) hydrogels with tunable mechanical properties.
- To investigate the effect of hydrogel stiffness on spheroid formation and liver-like function of encapsulated Huh7.5 cells in a 3D liver tissue model.
- To establish guidelines for controlling Huh7.5 cell spheroid formation in modified PEG-DA hydrogels for potential drug screening applications.
Main Methods:
- Synthesis of fibrinogen-modified PEG-DA hydrogels with stiffness ranging from 0.1-6 kPa.
- Encapsulation of Huh7.5 cells within the hydrogels to form 3D liver tissue models.
- Culturing spheroids over three weeks and analyzing spheroid size, cell proliferation, albumin secretion, and CYP450 expression.
Main Results:
- Hydrogel stiffness was successfully tuned to mimic normal (compliant) and cirrhotic (stiff) liver environments.
- Softer hydrogels (lower stiffness) promoted the formation of larger spheroids (50-200 μm) and enhanced cell proliferation, albumin secretion, and CYP450 expression.
- Incorporation of PEGylated-fibrinogen in hydrogels improved cell survival and functionality, potentially via enhanced fibronectin binding.
Conclusions:
- Hydrogel stiffness is a critical factor in controlling liver cell spheroid formation and function in 3D engineered tissues.
- Softer, fibrinogen-modified PEG-DA hydrogels support enhanced liver-like functions and cell viability, serving as a promising model for drug discovery.
- This study provides a framework for designing biomaterials to mimic native tissue mechanics for improved cell-based assays.
