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Human Pluripotent Stem Cell Culture on Polyvinyl Alcohol-Co-Itaconic Acid Hydrogels with Varying Stiffness Under Xeno-Free Conditions
Published on: February 3, 2018
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Substrate elasticity does not impact DNA methylation changes during differentiation of pluripotent stem cells
Mohamed H Elsafi Mabrouk1, Kira Zeevaert1, Ann-Christine Henneke1
1Helmholtz-Institute for Biomedical Engineering, RWTH Aachen University Medical School, Aachen, Germany; Institute for Stem Cell Biology, University Hospital of RWTH Aachen, Aachen, Germany.
Cytotherapy
|April 7, 2024
Summary
Substrate stiffness does not significantly impact induced pluripotent stem cell (iPSC) differentiation. Epigenetic differences were observed between polydimethylsiloxane (PDMS) and tissue culture plastic (TCP), but not across varying PDMS elasticities.
Area of Science:
- Biomaterials Science
- Stem Cell Biology
- Epigenetics
Background:
- Substrate elasticity is a known factor influencing stem cell fate.
- The specific impact of matrix stiffness on induced pluripotent stem cell (iPSC) differentiation and associated epigenetic modifications remains largely unexplored.
Purpose of the Study:
- To investigate how matrix stiffness affects the differentiation of iPSCs into endoderm, mesoderm, and ectoderm.
- To determine if epigenetic modifications, specifically DNA methylation, correlate with substrate stiffness during iPSC differentiation.
Main Methods:
- Culturing iPSCs on tissue culture plastic (TCP) and polydimethylsiloxane (PDMS) with varying Young's moduli (0.2 kPa, 16 kPa, 64 kPa).
- Assessing iPSC growth and differentiation using immunofluorescence and gene expression of canonical markers.
- Analyzing DNA methylation profiles of undifferentiated and differentiated iPSCs.
Main Results:
- No significant impact of PDMS substrate stiffness on iPSC differentiation markers was observed.
- DNA methylation profiles showed no significant differences across the tested PDMS elasticities.
- Epigenetic differences in DNA methylation were detected when comparing PDMS substrates to TCP, particularly during mesodermal differentiation.
Conclusions:
- The stiffness of PDMS substrates does not influence the directed differentiation of iPSCs.
- Observed epigenetic differences between PDMS and TCP may be due to factors other than stiffness, such as chemical properties of TCP.
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