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Regulation of dendritic cell function by microbial stimuli.

C Reis e Sousa1, S D Diebold, A D Edwards

  • 1Immunobiology laboratory, cancer research UK, London research institute, 44, Lincoln's Inn Fields, WC2A 3PX, London, United Kingdom. caetano@cancer.org.uk <caetano@cancer.org.uk>

Pathologie-Biologie
|June 13, 2003
PubMed
Summary

Dendritic cells (DCs) transition from a resting to an effector state upon infection, influencing adaptive immunity. Different pathogen encounters dictate DC cytokine production, shaping immune responses.

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Area of Science:

  • Immunology
  • Cellular Biology

Background:

  • Dendritic cells (DCs) are crucial for initiating T cell responses and regulating adaptive immunity.
  • DCs exist in a resting state in vivo, requiring external signals, often from infection, to become activated effector cells capable of priming T cells.

Purpose of the Study:

  • To investigate how pathogen recognition by dendritic cells influences their activation state and cytokine production.
  • To understand the plasticity of dendritic cells in directing adaptive immune responses based on encountered pathogens.

Main Methods:

  • Exposure of murine dendritic cells to various pathogens or their products.
  • Analysis of dendritic cell migration, MHC presentation, co-stimulatory potential, and cytokine production (IL-12 p70, IL-10).
  • Investigation of the role of Toll-like receptors (TLRs) in pathogen recognition by dendritic cells.

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Main Results:

  • Pathogen exposure induces DC migration, enhances MHC presentation, and increases co-stimulatory capacity.
  • Dendritic cell cytokine profiles (IL-12 p70 vs. IL-10) are pathogen-dependent, particularly in splenic CD8alpha+ and CDalpha-CD4- subsets.
  • CD4+ DCs appear unable to produce IL-12 p70, highlighting subset-specific responses.

Conclusions:

  • Dendritic cell activation and function are significantly modulated by infection.
  • The type of pathogen encountered dictates the cytokine profile of specific DC subsets, thereby directing distinct adaptive immune responses.
  • Dendritic cells exhibit remarkable plasticity in responding to infection and orchestrating immunity.