Ligand-conjugated quantum dots monitor antigen uptake and processing by dendritic cells.
basic_science · Level V
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Abstract
The dendritic cell (DC) specific pathogen-uptake receptor (DC-SIGN) internalizes antigens for degradation and presentation onto MHC molecules. At the cell membrane, DC-SIGN forms nanoclusters that facilitate virus capture. However, internalized viruses, such as HIV-1, escape degradation. Here, we exploit ligand-conjugated, virus-sized, highly photostable quantum dots (QDs) to monitor in living cells antigen binding, entry, and trafficking. The antigen-coated QDs specific uptake and persistence in live DCs open the possibility for tracking antigen-presenting cells in vivo.
Medical subject headings
- Antigens
- Cell Adhesion Molecules
- Dendritic Cells
- Immunoassay
- Lectins, C-Type
- Microscopy, Fluorescence
- Quantum Dots
- Receptors, Cell Surface