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[Dendritic cells and interaction with other cell types. Immune tolerance].
1Centre d'immunologie de Marseille Luminy, CNRS-INSERM, Université de la Méditerranée Parc scientifique de Luminy, case 906, 13288 Marseille, France.
Pathologie-Biologie
|August 4, 2001
Summary
The thymus deletes self-reactive T cells, but some escape to the periphery. Peripheral mechanisms like deletion and immune deviation control these potentially harmful T cells to maintain self-tolerance.
Area of Science:
- Immunology
- T cell biology
- Self-tolerance
Context:
- T cell tolerance is crucial for preventing autoimmune diseases.
- The thymus is the primary site for establishing T cell tolerance.
- Self-reactive T cells that escape thymic deletion pose a risk to the host.
Purpose:
- To explain the mechanisms of T cell tolerance.
- To highlight the roles of the thymus and periphery in controlling self-reactive T cells.
- To discuss how escaped self-reactive T cells are managed in the periphery.
Summary:
- T cell tolerance is established in the thymus through the deletion of self-reactive T cells, involving interdigitating dendritic cells and medullary epithelial cells.
- Despite thymic censorship, some self-reactive T cells enter the peripheral circulation.
- Peripheral mechanisms, including deletion and immune deviation, further control these potentially harmful T cells to maintain immune homeostasis.
Impact:
- Understanding these tolerance mechanisms is vital for developing therapies for autoimmune diseases.
- This knowledge can inform strategies to prevent graft-versus-host disease after transplantation.
- Elucidating these processes contributes to the broader understanding of immune system regulation.