Nanocomposite gold-silk nanofibers

Area of Science:

• Biomaterials Science
• Nanotechnology
• Cell Biology

Background:

• Cell-material interactions are crucial for tissue engineering.
• Surface chemistry and nanotopography significantly influence cell behavior.
• Silk nanofibers (SNFs) offer a promising scaffold material.

Purpose of the Study:

• To create advanced silk nanofibers (SNFs) incorporating gold nanoparticles (AuNPs).
• To chemically modify these AuNP-doped SNFs with arginine-glycine-aspartic acid (RGD) peptides.
• To investigate the impact of these modified SNFs on human mesenchymal stem cell (hMSC) behavior.

Main Methods:

• Electrospinning of silk fibroin with gold seed nanoparticles to form SNF(seed).
• Gold reduction to create AuNP-doped SNFs (SNFs(Au)) with enhanced mechanical properties.
• Chemical modification of SNFs(Au) with RGD peptides.

Main Results:

• AuNPs were successfully synthesized and dispersed within the SNFs.
• SNFs(Au) exhibited a 70% increase in Young's modulus compared to bare SNFs.
• RGD-modified SNFs(Au) promoted a 2-fold increase in hMSC area and cell spreading.

Conclusions:

• Combining nanotopography and surface chemistry in SNFs enhances cell-material interactions.
• RGD-modified AuNP-doped SNFs represent a promising biomaterial for tissue engineering.
• This approach offers a versatile strategy for controlling cell behavior at the material interface.