ECM protein nanofibers and nanostructures engineered using surface-initiated assembly

Area of Science:

• Biomaterials Engineering
• Cell Biology
• Tissue Engineering

Background:

• The extracellular matrix (ECM) is a complex 3D network crucial for cellular functions.
• Cell-mediated assembly, exemplified by fibronectin (FN) fibrillogenesis, involves cell receptors and forces to organize ECM proteins.
• Current methods lack precise control over ECM architecture and composition.

Purpose of the Study:

• To develop a novel method for recapitulating cell-mediated ECM assembly in vitro.
• To engineer ECM protein-based materials with controlled fiber geometry and scaffold architecture.
• To create biomimetic materials for studying cellular processes and tissue regeneration.

Main Methods:

• Surface-initiated assembly (SIA) using protein adsorption onto hydrophobic polydimethylsiloxane (PDMS) surfaces.
• Microcontact printing to pattern unfolded ECM proteins onto thermally responsive poly(N-isopropylacrylamide) (PIPAAm) surfaces.
• Thermally-triggered release and assembly of ECM protein nanofibers and nanostructures.

Main Results:

• SIA successfully generated insoluble ECM protein fibers and nanostructures with controlled geometries.
• The method demonstrated precise control over protein composition, including multi-component assemblies (FN, laminin, fibrinogen, collagens).
• Engineered patterns on PDMS stamps allowed for the creation of complex ECM architectures.

Conclusions:

• SIA effectively recapitulates cell-mediated ECM assembly using protein-surface interactions.
• This technique offers precise control over ECM material properties, mimicking in vivo structures.
• SIA provides a versatile platform for engineering biomimetic scaffolds for various biological applications.