Synthesis of gelatin microspheres containing interferon

Area of Science:

• Biomaterials Science
• Drug Delivery Systems
• Immunology

Background:

• Gelatin microspheres are promising drug carriers.
• Controlling drug release and degradation is crucial for effective delivery.
• Interferon-alpha has therapeutic applications but requires targeted delivery.

Purpose of the Study:

• To synthesize and characterize gelatin microspheres for drug delivery.
• To investigate the effect of glutaraldehyde cross-linking on microsphere degradation and interferon release.
• To evaluate the interaction of these microspheres with macrophages and their intracellular fate.

Main Methods:

• Synthesis of sub-micron gelatin microspheres via glutaraldehyde cross-linking.
• Degradation studies in collagenase-containing phosphate-buffered saline.
• Interferon-alpha incorporation and release kinetics analysis.
• In vitro phagocytosis assays with macrophages.

Main Results:

• Microsphere degradation rate decreased with increased glutaraldehyde cross-linking.
• High trapping efficiency for interferon-alpha was achieved.
• Cross-linking extent modulated the rate of interferon release.
• Macrophages readily phagocytosed microspheres irrespective of cross-linking.
• Intracellular degradation of microspheres resulted in sustained interferon release.

Conclusions:

• Glutaraldehyde cross-linking offers a tunable method to control gelatin microsphere degradation and drug release kinetics.
• Gelatin microspheres are effectively internalized by macrophages, enabling intracellular drug delivery.
• These findings support the potential of cross-linked gelatin microspheres as a platform for sustained intracellular delivery of interferon-alpha.