DNA origami-based artificial antigen-presenting cells for adoptive T cell therapy

Area of Science:

• Biotechnology
• Immunology
• Nanotechnology

Background:

• Nanosized artificial antigen-presenting cells (aAPCs) are crucial for effective adoptive cell therapy.
• Precise spatial control over ligand presentation is key to enhancing T cell activation.

Purpose of the Study:

• To engineer highly effective aAPCs using DNA origami nanostructures.
• To investigate the impact of ligand density and spatial arrangement on T cell activation and function.

Main Methods:

• Utilized DNA origami nanostructures as scaffolds to precisely position anti-CD28 antibodies and peptide-major histocompatibility complex (pMHC) ligands.
• Quantified ligand-receptor interactions and T cell activation at the single-molecule level.
• Performed in vitro and in vivo assays to evaluate the therapeutic efficacy of the engineered aAPCs.

Main Results:

• Increased pMHC density on DNA origami scaffolds enhanced pMHC-TCR binding dwell time (9.9 to 12.1 s), leading to improved T cell responses.
• Optimized DNA origami-based aAPCs demonstrated significant tumor growth inhibition in vivo.
• The study provided insights into the quantitative analysis of T cell activation dynamics.

Conclusions:

• DNA origami nanostructures enable rational design of aAPCs with controlled ligand presentation for enhanced immunotherapy.
• Engineered aAPCs show promising potential for effective cancer immunotherapy and molecular vaccine development.