Tailored Physicochemical Cues Direct Human Mesenchymal Stem Cell Differentiation through Epigenetic Regulation Using...

Area of Science:

• Biomaterials Science
• Stem Cell Biology
• Mechanobiology

Background:

• The extracellular matrix (ECM) critically influences stem cell differentiation via biophysical cues.
• Understanding stem cell fate decisions under complex ECM cues is limited by the lack of versatile ECM models.

Purpose of the Study:

• To design and utilize versatile artificial ECMs to investigate mechanotransduction and stem cell fate regulation.
• To probe the effects of engineered ECMs on human adipose-derived stem cells (hASCs) differentiation.

Main Methods:

• Fabrication of binary colloidal crystals (BCC) and polydimethylsiloxane-embedded BCC (BCCP) using colloidal self-assembly.
• Characterization of ECM properties (chemistry, roughness, stiffness, ion release, protein adsorption).
• Assessment of hASC adhesion, proliferation, differentiation, focal adhesion complex, cytoskeletal organization, and signaling pathway activation.

Main Results:

• BCC and BCCP exhibited distinct effects on hASC fate, with BCC promoting early osteogenesis and later adipogenesis.
• BCC-mediated cell adhesion altered focal adhesion complex size, cytoskeletal rearrangement, and mechanosensitive transcription factors (e.g., c-FOS).
• Modulation of PI3K/AKT and Hippo signaling pathways, alongside histone modifications, indicated BCC-driven mechanotransduction and chromatin remodeling.

Conclusions:

• Versatile BCCs serve as effective artificial ECMs for regulating human stem cell fate.
• Engineered ECMs can uniquely control stem cell behavior through specific biological signaling.
• Findings provide a foundation for advanced biomaterial design and stem cell engineering applications.