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Liquid-Liquid Phase Separation-Mediated Cellular-Scale Compartmentalization of Hydrogel Covalent Cross-Linking
Jianyang Zhao1,2,3, Yuan Hu1,2,3, Hao Li4
1School of Biomedical Sciences and Engineering, Guangzhou International Campus, South China University of Technology, Guangzhou 511442, P.R. China.
Journal of the American Chemical Society
|April 19, 2025
Summary
Researchers developed novel biomimetic hydrogels using liquid-liquid phase separation (LLPS) to mimic the extracellular matrix (ECM). These hydrogels support cell development and enhance bone regeneration by controlling structural heterogeneity.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Cell Biology
Background:
- The extracellular matrix (ECM) exhibits structural heterogeneity crucial for cell mechanotransduction and development.
- Mimicking this ECM heterogeneity in biomaterials is challenging but essential for inductive cell carriers.
- Controlled liquid-liquid phase separation (LLPS) is a key process in natural ECM formation.
Purpose of the Study:
- To engineer ECM-mimetic hydrogels with controlled structural heterogeneity using temperature-assisted LLPS.
- To investigate the impact of these hydrogels on human mesenchymal stem cell (hMSC) behavior and function.
- To enhance osteogenesis and bone regeneration using these novel biomaterials.
Main Methods:
- Utilized temperature-assisted liquid-liquid phase separation (LLPS) of a temperature-responsive macromer (TRM).
- Fabricated hydrogels with compartmentalized microdomains of dense cross-linking within a loosely cross-linked matrix.
- Encapsulated human mesenchymal stem cells (hMSCs) within the developed hydrogels.
Main Results:
- Successfully created ECM-mimetic hydrogels with distinct microdomain structures via LLPS.
- Demonstrated enhanced hMSC spreading, microtubule-based mechanotransduction, and autophagic flux.
- Observed significantly improved osteogenesis and bone regeneration in encapsulated hMSCs.
Conclusions:
- LLPS is a viable strategy for fabricating ECM-mimetic hydrogels with controlled structural heterogeneity.
- The developed hydrogels effectively support cell mechanotransduction and promote osteogenic differentiation.
- These findings offer insights into biomaterial design for regenerative medicine and mechanobiology.
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