A Modular Bioinstructive Platform Reveals Mechanistic Insights into Additive-Free, Topography-Driven Osteogenesis

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Cell Biology

Background:

• Developing physiologically relevant in vitro bone models is crucial for drug discovery and regenerative medicine.
• Reproducing osteogenesis (bone formation) without biochemical induction remains a significant challenge.

Purpose of the Study:

• To present a scalable, bioinstructive microparticle platform that induces mesenchymal stem cell osteogenesis via topography-mediated mechanotransduction.
• To demonstrate the potential of precision-engineered biomaterials for additive-free in vitro modeling.

Main Methods:

• Engineered 3D surface topographies on microparticles using two-photon polymerization lithography.
• Utilized RNA-Seq and signaling analyses to elucidate the osteogenic mechanism.
• Investigated topography-mediated mechanotransduction in the absence of exogenous additives.

Main Results:

• Engineered 3D topographies successfully induced mesenchymal stem cell osteogenesis.
• Identified a mechanistic pathway involving cytoskeletal reorganization, Hedgehog signaling (GLI1), RUNX2, SOX9, and IGF-II.
• Demonstrated graded GLI1 expression in response to tunable 3D topography dimensions.

Conclusions:

• The bioinstructive microparticle platform provides a scalable and modular strategy for reproducible control of cell fate.
• This approach enables additive-free, standardized bone models for in vitro research and regenerative medicine applications.