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Microengineering 3D Collagen Hydrogels with Long-Range Fiber Alignment
Published on: September 7, 2022
Alignment of multi-layered muscle cells within three-dimensional hydrogel macrochannels
Stephanie L Hume1, Sarah M Hoyt, John S Walker
1Department of Chemical and Biological Engineering, University of Colorado Boulder, Boulder, CO 80309, USA.
Acta Biomaterialia
|February 14, 2012
Summary
This study developed poly(ethylene glycol) hydrogels with controllable macrochannels to align skeletal myoblasts. Three-dimensional features improved cell alignment and myoblast differentiation, highlighting the role of spatial cues.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Cell Biology
Background:
- Poly(ethylene glycol) (PEG) hydrogels are widely used biomaterials.
- Skeletal myoblast alignment and differentiation are crucial for muscle regeneration.
- Controlling the microenvironment is key to directing cell behavior.
Purpose of the Study:
- To develop and test PEG hydrogels with independently controlled macrochannel dimensions.
- To investigate the effect of macrochannel geometry on skeletal myoblast alignment.
- To assess the impact of macrochannel dimensions on myoblast differentiation.
Main Methods:
- Fabrication of UV-photopatterned thiol-ene molds for macrochannel creation.
- Synthesis of PEG-RGD hydrogels with tunable channel widths (40-200 μm) and depths (100-200 μm).
- Culture of skeletal myoblasts (C2C12) within hydrogel channels and analysis of cell alignment and differentiation markers (myoD, myogenin, MCH IIb).
Main Results:
- Successful culture of skeletal myoblasts in multi-layered channels.
- Improved cell alignment with decreasing channel width, increasing channel depth, and increasing cell layer distance from the base.
- Myoblast differentiation into myotubes occurred across all channel geometries, but myotube size and nuclei number increased in larger channels.
Conclusions:
- Three-dimensional macrochannel features promote skeletal myoblast alignment more effectively than 2D cues.
- Channel geometry influences cell alignment, while differentiation is less dependent on size.
- This work highlights the significance of 3D spatial cues in directing cell behavior for tissue engineering applications.
