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Stencil Micropatterning of Human Pluripotent Stem Cells for Probing Spatial Organization of Differentiation Fates
Published on: June 17, 2016
Confined 3D microenvironment regulates early differentiation in human pluripotent stem cells
Giovanni G Giobbe1, Monica Zagallo, Massimo Riello
1Department of Industrial Engineering (DII), University of Padua, via Marzolo 9, 35131 Padua, Italy.
Biotechnology and Bioengineering
|June 8, 2012
Summary
Biomaterials in 3D microwells can guide human pluripotent stem cell differentiation into specific germ layers by concentrating secreted factors. This controlled microenvironment enhances ectoderm and endoderm development, unlike suspension cultures favoring mesoderm.
Area of Science:
- Stem cell biology
- Biomaterials science
- Developmental biology
Background:
- Directing human pluripotent stem cell (hPSC) differentiation into specific lineages is challenging for therapeutic applications.
- Cell differentiation involves secretome activity, extracellular matrix remodeling, and self-organization into germ layers.
Purpose of the Study:
- To investigate how 3D microenvironments regulate early germ layer differentiation in human embryonic stem cell-derived embryoid bodies (EBs).
- To design a hydrogel microwell array to create confined niches for EB culture, controlling secreted molecule accumulation.
Main Methods:
- Designed a permeable, biocompatible hydrogel microwell array.
- Utilized Fluorescence Recovery After Photobleaching (FRAP) to characterize hydrogel properties.
- Cultured EBs in suspension and in microwells with different width/depth ratios (1:1 and 1:2).
- Analyzed cell viability, size, gene expression (whole genome microarrays), and germ layer marker expression (immunofluorescence).
Main Results:
- EBs cultured in microwells remained viable with comparable size to suspension cultures after 8 days.
- Significant differential gene expression was observed between suspension and confined EB cultures.
- Microwell culture promoted genes for pattern specification, brain development, ectoderm, and endoderm differentiation.
- Suspension culture favored genes for mesoderm specification and heart development.
- Immunofluorescence confirmed that confined EB culture drives specific differentiation patterns.
Conclusions:
- Local accumulation of secreted molecules within confined 3D microenvironments, like hydrogel microwells, directs hPSC differentiation patterns.
- Biomaterials can control hPSC differentiation by creating specific niches through secreted factor concentration.
- Findings are applicable to both human embryonic stem cells (hESCs) and human induced pluripotent stem cells (hiPSCs).
