Interactions between spider silk and cells--NIH/3T3 fibroblasts seeded on miniature weaving frames.

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Biotechnology

Background:

• Silk biomaterials are promising for tissue engineering due to mechanical properties.
• Silkworm silk can be immunogenic; spider silk offers a biocompatible alternative.
• Native spider dragline silk, the strongest natural fiber, was investigated.

Purpose of the Study:

• To evaluate native spider silk as a biomaterial for tissue engineering.
• To assess fibroblast cell adhesion and proliferation on spider silk scaffolds.
• To compare native spider silk with modified (enzymatically treated) silk.

Main Methods:

• Spider silk was harvested, sterilized, and fabricated into scaffolds.
• Fibroblast cells were seeded onto scaffolds to analyze morphology, actin alignment, and proliferation.
• Cell proliferation was quantified via cell counts and fluorescence over 5 days.
• Native silk results were compared to trypsin-digested silk and control surfaces.

Main Results:

• Fibroblast cells demonstrated clear adherence and alignment on native spider silk scaffolds.
• Significant cell proliferation (p<0.01) was observed on native spider silk.
• Enzymatic treatment of spider silk tended to reduce adhesion and proliferation rates, though not significantly.
• Native spider silk showed less proliferation than collagen- and fibronectin-coated surfaces.

Conclusions:

• Native spider silk supports cell adhesion and proliferation effectively, without requiring chemical modification.
• Spider silk's inherent properties make it a viable biomaterial for tissue engineering applications.
• This study pioneers research into cellular mechanics on native spider silk fibers, despite challenges in biotechnological production.