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In vivo enhancement of dendritic cell function
Janine Bilsborough1, Joanne L Viney
1Amgen, 1201 Amgen Court West, Seattle, WA 98119, USA.
Annals of the New York Academy of Sciences
|February 1, 2005
Summary
Mucosal dendritic cells (DCs) in the gut promote immune tolerance by enhancing regulatory T cell function and limiting T cell proliferation. These findings reveal a key mechanism for maintaining gut homeostasis despite constant antigen exposure.
Area of Science:
- Immunology
- Gastroenterology
- Cell Biology
Background:
- The gut immune system typically maintains tolerance to ingested antigens, despite T cell recognition.
- Dendritic cells (DCs) are known for antigen presentation, but their role in gut tolerance is complex.
- Previous work indicated enhanced tolerance with increased DC numbers in vivo.
Purpose of the Study:
- Investigate the mechanistic basis of oral tolerance induction.
- Identify unique features of mucosal DCs.
- Determine the functional role of mucosal DCs in early T cell responses to fed antigens.
Main Methods:
- Focused on identifying specific features of mucosal dendritic cells.
- Examined the functional involvement of these DCs in T cell responses.
- Stimulated DCs with CpG to assess IFN-alpha secretion and T cell differentiation.
Main Results:
- Identified a population of plasmacytoid DCs in mucosal tissues.
- These DCs secrete IFN-alpha upon CpG stimulation.
- They drive naive T cells toward regulatory phenotypes, suppress T cell proliferation, and enhance regulatory T cell efficacy.
Conclusions:
- Mucosal DCs play a critical role in promoting gut immune tolerance.
- These DCs contribute to homeostatic regulation by enhancing regulatory T cell function.
- Intestinal DCs are crucial for tolerogenic antigen presentation in the face of high antigenic stimulation.