Biomaterials as Local Niches for Immunomodulation.

Area of Science:

• Biomaterials science
• Immunology
• Biomedical engineering

Background:

• The immune system defends against threats like cancer and infection.
• Traditional systemic immunomodulation causes side effects due to off-target effects.
• Localized delivery using biomaterial scaffolds can improve therapeutic outcomes.

Purpose of the Study:

• To review the fabrication of biomaterial scaffolds for immunomodulation.
• To discuss the application of these scaffolds in cancer immunotherapy, including in situ vaccination and T cell expansion.
• To explore the use of biomaterial scaffolds beyond cancer for immune tolerance and tissue regeneration.

Main Methods:

• Fabrication of macroscale biomaterial scaffolds with controlled properties (biocompatibility, biodegradability, porosity, release kinetics).
• Utilizing scaffolds for localized delivery of immunomodulatory agents and immune cell control.
• Application in in situ cancer vaccination and in vitro T cell expansion for adoptive cell therapy.

Main Results:

• Biomaterial scaffolds enable controlled release of therapeutic agents like GM-CSF for enhanced immune responses.
• Scaffolds facilitate recruitment, activation, and migration of immune cells, crucial for anti-tumor immunity.
• Scaffolds show promise in promoting immune tolerance and accelerating tissue regeneration.

Conclusions:

• Macroscale biomaterial scaffolds provide a versatile platform for localized immunomodulation.
• These scaffolds enhance cancer immunotherapy efficacy and offer potential for treating autoimmune diseases and promoting tissue repair.
• Tailoring scaffold design is key to achieving desired therapeutic effects and minimizing systemic toxicity.