Related Experiment Video
Updated: Jan 1, 2026
10:34
Ligand Nano-cluster Arrays in a Supported Lipid Bilayer
Published on: April 23, 2017
7.2K
Ultrasmall silica nanoparticles directly ligate the T cell receptor complex
Bradley Vis1,2, Rachel E Hewitt1, Tom P Monie1
1Biomineral Research Group, Department of Veterinary Medicine, University of Cambridge, CB3 0ES Cambridge, United Kingdom.
Summary
Ultrasmall silica nanoparticles (USSN) activate T cells by directly binding the T cell receptor (TCR):CD3 complex. USSN act as partial agonists, initiating T cell signaling without full activation, offering therapeutic potential.
Area of Science:
- Immunology
- Nanotechnology
- Biochemistry
Background:
- The immune system's response to ultrasmall nanoparticles (<10-nm diameter) is not well understood.
- Ultrasmall silica nanoparticles (USSN) show therapeutic promise and can directly stimulate T lymphocytes.
Purpose of the Study:
- To elucidate the mechanisms and cell signaling pathways involved in USSN-induced T cell activation.
- To determine if USSN can be translated into therapeutic applications.
Main Methods:
- Competitive binding assays and molecular modeling were used to study USSN interactions with the T cell receptor (TCR):CD3 complex.
- Analysis of T cell signaling pathways, including protein phosphorylation and cytokine secretion.
Main Results:
- USSN directly bind the TCR:CD3 complex, activating both αβ and γδ T cells.
- USSN initiate primary T cell signaling pathways, such as the nuclear factor of activated T cells (NF-κB) pathway, by phosphorylating key downstream proteins.
- Full T cell proliferation and IL-2 secretion require costimulatory signals, indicating USSN are partial agonists.
Conclusions:
- USSN function as partial agonists of the TCR complex, inducing primary T cell activation signals.
- USSN's ability to bind the TCR complex transiently and dissolve into harmless orthosilicic acid makes them attractive for targeted therapies.
