Towards 4th generation biomaterials: a covalent hybrid polymer-ormoglass architecture

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Tissue Engineering

Background:

• Hybrid materials are crucial for mimicking the extracellular matrix (ECM) in bone tissue engineering.
• Conventional hybrid materials often suffer from poor constituent interaction and non-homogeneous degradation.
• Existing scaffolds frequently fail to provide optimal biological responses due to masked bioactive phases.

Purpose of the Study:

• To develop a novel hybrid biomaterial with enhanced constituent interaction and exposed bioactive surfaces.
• To create a scaffold that effectively mimics the bone ECM microenvironment for regenerative applications.
• To investigate the influence of tailored surface properties on cellular behavior.

Main Methods:

• Covalent coating of polylactic acid electrospun fibers with a bioactive organically modified glass (ormoglass, Si-Ca-P2 system).
• Modification of ormoglass composition and experimental parameters to tailor surface properties like roughness, stiffness, and morphology.
• Assessment of material properties including hydrophilicity, mechanical strength, ion release, nanoroughness, and cell adhesion/spreading (using rMSCs and rEPCs).

Main Results:

• The developed hybrid fibers exhibited improved hydrophilicity and mechanical properties compared to pure polymeric mats.
• The material demonstrated bioactive ion release and a nanorough surface structure.
• Significant improvements in cell adhesion and spreading of rat mesenchymal stem cells (rMSCs) and rat endothelial progenitor cells (rEPCs) were observed within one day.
• Tailoring ormoglass composition allowed for control over surface characteristics, influencing cellular response.

Conclusions:

• The novel hybrid material offers strong interactions between constituents and an exposed bioactive surface, effectively mimicking the bone ECM.
• The material demonstrates promising potential as an instructive scaffold for bone tissue engineering due to enhanced cellular response.
• This approach represents a significant advancement in designing functional regenerative biomaterials by providing tunable physical and chemical cues to cells.