Lipoplex-Functionalized Thin-Film Surface Coating Based on Extracellular Matrix Components as Local Gene Delivery...

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Regenerative Medicine

Background:

• Smart biomaterials are crucial for advanced tissue engineering applications.
• Developing effective coatings that mimic the natural bone extracellular matrix is essential for bone regeneration.
• Gene delivery systems integrated into biomaterials offer novel therapeutic strategies.

Purpose of the Study:

• To create a gene-activated surface coating for bone tissue engineering.
• To functionalize polyelectrolyte multilayers with DNA/lipid-nanoparticles (lipoplexes) for enhanced biomaterial properties.
• To investigate the potential of this coating to promote osteogenic differentiation of mesenchymal stem cells.

Main Methods:

• Fabrication of polyelectrolyte multilayers using collagen I and chondroitin sulfate via layer-by-layer assembly.
• Incorporation of DNA/lipid-nanoparticles (lipoplexes) into the multilayers.
• Analysis of thin-film formation, collagen structuring, and lipoplex embedding using surface-sensitive methods.
• Culture of mesenchymal stem cells on the functionalized coating and assessment of cell attachment, growth, and DNA uptake.
• Induction of osteogenic differentiation using lipoplexes encoding for bone morphogenetic protein 2, verified by gene expression analysis and histochemical staining.

Main Results:

• Successful fabrication of thin-film polyelectrolyte multilayers with fibrillar collagen structuring and homogenous lipoplex embedding.
• Excellent mesenchymal stem cell attachment, growth, and cargo uptake observed on the lipoplex-functionalized coating.
• Lipoplex-mediated delivery of DNA encoding for bone morphogenetic protein 2 successfully induced osteogenic differentiation of mesenchymal stem cells.
• Demonstrated mRNA quantification for osteogenic genes and positive histochemical staining.

Conclusions:

• A novel gene-functionalized, extracellular matrix-mimicking multilayer coating has been developed.
• This smart surface functionalization, combining collagen I, chondroitin sulfate, and lipoplexes, shows significant promise for bone tissue engineering constructs and implant coatings.
• The coating effectively promotes stem cell differentiation and holds potential for enhancing bone regeneration.