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Engineering hepatocellular morphogenesis and function via ligand-presenting hydrogels with graded mechanical
Eric J Semler1, Perry A Lancin, Anouska Dasgupta
1Department of Chemical and Biochemical Engineering, Rutgers University, 98 Brett Road, Piscataway, NJ 08854, USA.
Biotechnology and Bioengineering
|March 4, 2005
Summary
Hepatocytes cultured on gels with varying stiffness and fibronectin (FN) levels showed altered cell shape and function. Substrate stiffness significantly impacts how cells respond to fibronectin, influencing liver-specific functions.
Area of Science:
- Biomaterials Science
- Cell Biology
- Tissue Engineering
Background:
- Hepatocyte behavior is influenced by the physical and biochemical properties of their microenvironment.
- Understanding these interactions is crucial for developing effective tissue engineering strategies and biomaterials for liver applications.
Purpose of the Study:
- To investigate how substrate stiffness and fibronectin (FN) concentration affect hepatocellular morphogenesis and function.
- To identify specific regimes where hepatocytes are sensitive or insensitive to ligand presentation based on substrate compliance.
Main Methods:
- Hepatocytes were cultured on polyacrylamide gels with controlled stiffness and varying fibronectin (FN) functionalization.
- Cellular morphology, albumin secretion, and gene expression were analyzed under different substrate conditions.
Main Results:
- Hepatocellular morphogenesis varied from 2D-spread to 3D-spheroid formation, regulated by both substrate compliance and FN concentration.
- Increasing substrate compliance promoted cell compaction and increased albumin secretion.
- Increasing FN concentration generally inhibited cell compaction and reduced liver-specific function.
- Hepatocytes on stiffer substrates showed greater sensitivity to changes in FN concentration.
Conclusions:
- Substrate stiffness plays a critical role in modulating hepatocellular responses to fibronectin (FN) presentation.
- Designing biomaterials with specific biochemical and biophysical properties is essential for supporting liver-specific functions.
- These findings offer insights for creating advanced hepatospecific biomaterials.