Mechanically heterogeneous hydrogel with cell-programmed network restructuring promotes tissue regeneration by...

Area of Science:

• Biomaterials Science
• Stem Cell Biology
• Tissue Engineering

Background:

• Stem cell differentiation involves dynamic extracellular matrix (ECM) remodeling, creating biomechanical cues crucial for tissue development.
• Conventional biomaterials lack the spatiotemporal heterogeneity of native ECM, hindering their ability to guide complex developmental processes.
• Mimicking the dynamic and adaptive nature of the native ECM is essential for advanced regenerative medicine.

Purpose of the Study:

• To develop a novel biomaterial capable of dynamic microenvironmental remodeling guided by cellular activity.
• To investigate the role of cell-programmed matrix adaptation in promoting stem cell differentiation and tissue regeneration.
• To establish a new paradigm for biomaterials that actively interact with and guide stem cell fate.

Main Methods:

• Development of a cell-programmed adaptive contraction (CPAC) hydrogel.
• Utilizing alkaline phosphatase-mediated transitions within microgels to induce cell-driven remodeling.
• Analysis of mechanotransduction pathways, including microRNA expression, EZH2, and H3K27 trimethylation.
• In vivo studies using rat cranial defect models to assess bone repair efficacy.

Main Results:

• CPAC hydrogels enabled mesenchymal stem cells (MSCs) to actively remodel their microenvironment, creating mechanical heterogeneity.
• This remodeling process promoted osteogenesis via a positive feedback loop involving enhanced mechanotransduction.
• The dynamic matrix changes modulated gene expression critical for osteogenic differentiation.
• Significant enhancement of bone repair was observed in vivo using MSC-laden CPAC hydrogels.

Conclusions:

• Cell-programmed adaptive biomaterials can recapitulate native ECM dynamics to effectively guide stem cell fate.
• CPAC hydrogels represent a promising platform for regenerative medicine, particularly for bone defect repair.
• This approach offers a new strategy for creating biomaterials that actively orchestrate tissue morphogenesis.