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Dendritic cells are potent antigen-presenting cells for microbial superantigens
N Bhardwaj1, S M Friedman, B C Cole
1Laboratory of Cellular Physiology and Immunology, Rockefeller University, New York, New York.
The Journal of Experimental Medicine
|January 1, 1992
Summary
Dendritic cells are highly potent antigen-presenting cells (APCs) that effectively stimulate T cell responses to superantigens, even at very low concentrations. These findings highlight the critical role of dendritic cells in initiating adaptive immunity.
Area of Science:
- Immunology
- Cell Biology
Background:
- Dendritic cells are key immune cells involved in T cell activation.
- Understanding the antigen-presenting capabilities of dendritic cells is crucial for immunology.
Purpose of the Study:
- To investigate the potency of dendritic cells in stimulating T cell responses to superantigens.
- To compare the antigen-presenting capacity of dendritic cells with other mononuclear cells.
Main Methods:
- Human blood mononuclear cells were isolated.
- T cell responses to superantigens were measured in the presence of dendritic cells, monocytes, and B cells.
- Major histocompatibility complex (MHC) expression was assessed.
Main Results:
- Dendritic cells were 10-50 times more potent than monocytes or B cells in inducing T cell responses to superantigens.
- Dendritic cells presented femtomolar concentrations of superantigen, activating T cells where other APCs were inactive.
- Maximal T cell activation was achieved by pulsing dendritic cells for 1 hour with picomolar staphylococcal enterotoxin B.
Conclusions:
- Dendritic cells are exceptionally potent antigen-presenting cells for superantigens.
- Even minute amounts of superantigen presented by dendritic cells can elicit significant T cell responses in vivo.
- This highlights the critical role of dendritic cells in initiating immunogenicity.