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DNA Origami-Mediated Substrate Nanopatterning of Inorganic Structures for Sensing Applications
Published on: September 27, 2019
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Patterned Antigens on DNA Origami Controls the Structure and Cellular Uptake of Immune Complexes.
Travis R Douglas1, Shana Alexander1, Leo Y T Chou1
1Institute of Biomedical Engineering, University of Toronto, Toronto M5S 2E3, Canada.
ACS Nano
|January 6, 2025
Summary
Researchers created precise synthetic immune complexes (ICs) using DNA origami. Controlling antigen arrangement dictates IC structure and influences immune cell interactions, paving the way for targeted therapies and vaccines.
Area of Science:
- Immunology
- Nanotechnology
- Biochemistry
Background:
- Immune complexes (ICs) are crucial for immunity, vaccines, and therapies.
- Current IC synthesis methods yield heterogeneous structures, limiting control over cellular interactions and pharmacokinetics.
Purpose of the Study:
- To develop synthetic ICs with defined structure and controlled cellular interactions using DNA origami.
- To investigate how antigen arrangement influences IC formation and immune cell responses.
Main Methods:
- Utilized DNA origami to display antigens (Ags) in precise spatial patterns on synthetic ICs.
- Investigated the impact of Ag spacing relative to antibody (Ab) Fab arm tolerance on IC assembly (monomeric vs. multimeric).
- Analyzed how IC structural parameters (Ag number, Ab-Ag ratio, DNA origami shape) affect Fc valency and immune cell interactions.
Main Results:
- Ag arrangement dictates IC formation into monomeric or multimeric structures based on Fab arm tolerance.
- Fine-tuned IC size, shape, and Fc valency by adjusting Ag number, Ab-Ag ratios, and DNA origami shape.
- Demonstrated differential IC uptake by macrophages (sensitive to cross-linking) and dendritic cells (responsive to Ab valency).
Conclusions:
- Established design principles for controlling synthetic IC structure and cellular interactions.
- Highlighted DNA origami-scaffolded ICs as a programmable platform for immunology research.
- Showcased potential for developing Fc receptor (FcγR)-targeted therapeutics and vaccines.
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