Silk fibroin nanoparticles for cellular uptake and control release.

Area of Science:

• Biomaterials Science
• Nanotechnology
• Drug Delivery Systems

Background:

• Silk fibroin, a natural polymer, offers biocompatibility and biodegradability.
• Nanoparticles are increasingly explored for targeted drug and growth factor delivery.
• Controlled release of therapeutic agents is crucial for effective treatment.

Purpose of the Study:

• To characterize silk nanoparticles from Bombyx mori and Antheraea mylitta.
• To evaluate their potential as a sustained release system for vascular endothelial growth factor (VEGF).
• To assess cellular uptake and toxicity of these silk nanoparticles.

Main Methods:

• Preparation of silk nanoparticles from silk fibroin solutions.
• Characterization of particle size, surface charge, stability, and morphology.
• In vitro cellular uptake studies using fluorescence-conjugated nanoparticles.
• In vitro assessment of VEGF release kinetics over 21 days.

Main Results:

• Silk nanoparticles were stable, spherical, negatively charged, with an average diameter of 150-170nm.
• Nanoparticles exhibited a Silk II (beta-sheet) structure and showed no overt toxicity.
• Significant accumulation of nanoparticles was observed in the cytosol of murine squamous cell carcinoma cells.
• Sustained release of VEGF from nanoparticles was observed over a 3-week period.

Conclusions:

• Silk nanoparticles are a promising, non-toxic platform for growth factor delivery.
• The sustained release of VEGF indicates potential therapeutic applications.
• These findings support the use of silk nanoparticles in regenerative medicine and cancer therapy.