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Scaffold Pore Geometry Guides Gene Regulation and Bone-like Tissue Formation in Dynamic Cultures
Marina Rubert1, Jolanda Rita Vetsch1, Iina Lehtoviita1
1Department of Health Sciences and Technology, Institute for Biomechanics, ETH Zurich, Zurich, Switzerland.
Tissue Engineering. Part A
|December 10, 2020
Summary
Scaffold pore geometry and mechanical stimuli influence bone tissue formation. Controlled spherical pores in monodisperse templated scaffolds (MTSC) and dynamic culture conditions enhance bone-like tissue development and mineralization.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Cell Biology
Background:
- Bone tissue engineering scaffolds often have uncontrolled pore geometries, complicating the study of cell responses to mechanical stimuli.
- Understanding how cells interact with scaffold features under dynamic conditions is crucial for designing effective bone regeneration strategies.
Purpose of the Study:
- To investigate the impact of controlled scaffold pore geometry and dynamic culture conditions on osteoblast differentiation and bone-like tissue formation.
- To compare the performance of monodisperse templated scaffolds (MTSC) with conventional salt-leached scaffolds (SLSC) under static and dynamic (wall shear stress) culture.
Main Methods:
- Fabrication of MTSC with controlled spherical pores and comparison with SLSC.
- Culture of human bone marrow-derived stromal cells under static and dynamic conditions in spinner flask bioreactors for up to 7 weeks.
- Assessment of osteoblast differentiation, extracellular matrix (ECM) formation, mineralization, and gene expression using collagen staining and microcomputed tomography (micro-CT).
Main Results:
- Dynamic culture conditions promoted more regular ECM formation and mineral distribution compared to static conditions for both scaffold types.
- MTSC enhanced ECM mineralization under dynamic conditions, while SLSC favored osteoblast differentiation and ECM formation.
- The spherical pore shape of MTSC under dynamic conditions resulted in a more trabecular bone-like structure.
Conclusions:
- Both scaffold pore geometry and mechanical environment significantly influence cell activity and bone-like tissue formation.
- Optimized scaffold design, considering both geometry and mechanical cues, is essential for mimicking bone tissue complexity and guiding engineered bone development.
- Fabrication methods enabling reproducible, geometrically controlled structures are vital for scaffold design optimization in bone regeneration.
