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Aggregate Size Optimization in Microwells for Suspension-based Cardiac Differentiation of Human Pluripotent Stem Cells
Published on: September 25, 2016
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Development of Pyramidal Microwells for Enhanced Cell Spheroid Formation in a Cell-on-Chip Microfluidic System for
Tepparit Wongpakham1, Thanapat Chunfong1, Wutthinan Jeamsaksiri2
1Department of Mechanical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand.
Cells
|January 8, 2025
Summary
Optimizing microfluidic devices with 90° pyramidal microwells enhances mouse embryonic stem cell (mESC) spheroid growth and cardiac differentiation. This 3D culture method surpasses traditional hanging drop techniques for tissue engineering applications.
Area of Science:
- Biotechnology
- Tissue Engineering
- Stem Cell Biology
Background:
- Three-dimensional (3D) cell culture models, such as those using microfluidic devices, offer more physiologically relevant environments than traditional 2D cultures.
- Mouse embryonic stem cells (mESCs) are a valuable model for studying early development and differentiation, including cardiac lineages.
Purpose of the Study:
- To investigate the impact of pyramidal microwell geometry in microfluidic devices on mouse embryonic stem cell (mESC) spheroid formation, growth, viability, and differentiation.
- To compare the efficiency of microfluidic 3D culture with varying microwell angles against the static hanging drop (HD) method.
Main Methods:
- Fabrication of microfluidic chips with pyramidal microwells of 66°, 90°, and 106° tip angles.
- Flow simulations to analyze fluid dynamics and shear stress within different microwell geometries.
- Culturing mESCs in microfluidic devices and HD method, followed by measurements of spheroid size, cell viability, and gene expression (Brachyury).
- Immunofluorescence staining to confirm cardiomyocyte differentiation.
Main Results:
- Flow simulations indicated that increased tip angle led to more uniform flow and reduced velocity gradients, with 90° microwells offering optimal conditions.
- Spheroids in 90° microwells achieved significantly larger diameters (~400 µm by Day 3) compared to other microwell angles and the HD method.
- Brachyury gene expression, a marker for mesodermal differentiation, was four times higher in 90° microwells than in HD cultures, suggesting enhanced differentiation potential.
- Immunofluorescence confirmed successful cardiomyocyte differentiation in mESCs cultured within the 90° microwells.
Conclusions:
- Microwell geometry critically influences fluid dynamics and cellular behavior in 3D microfluidic cultures.
- Pyramidal microwells with a 90° tip angle are superior for promoting mESC spheroid growth and cardiac differentiation.
- These findings provide crucial insights for designing optimized microfluidic systems for tissue engineering and regenerative medicine applications.
