Janus particles as artificial antigen-presenting cells for T cell activation

Area of Science:

• Biotechnology
• Immunology
• Materials Science

Background:

• T cell activation is crucial for adaptive immunity.
• Antigen-presenting cells (APCs) orchestrate T cell responses through specific cell-surface interactions.
• Mimicking APCs with synthetic materials could offer novel immunomodulatory tools.

Purpose of the Study:

• To engineer bifunctional Janus particles that mimic the "bull's eye" pattern of T cell-APC junctions.
• To investigate the effect of ligand spatial distribution on T cell activation.
• To explore the potential of Janus particles as artificial APCs.

Main Methods:

• Fabrication of bifunctional Janus particles with spatially segregated anti-CD3 and fibronectin ligands.
• Co-culture of engineered Janus particles with T cells.
• Assessment of T cell activation levels via various assays.
• Analysis of intracellular protein clustering.

Main Results:

• Janus particles successfully mimicked the "bull's eye" protein pattern.
• Modulating the spatial distribution of ligands on Janus particles allowed for tunable T cell activation.
• Ligand patterning influenced intracellular protein clustering within T cells.
• The engineered particles functioned as effective artificial APCs.

Conclusions:

• Multifunctional Janus particles can be effectively utilized for in vitro T cell activation.
• The spatial arrangement of ligands on anisotropic particles is a critical factor in modulating immune cell responses.
• Janus particles represent a promising platform for developing artificial APCs to control T cell activation.