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Stories From the Dendritic Cell Guardhouse.

J Kenneth Hoober1, Laura L Eggink1, Robert Cote1

  • 1Susavion Biosciences, Inc., Tempe, AZ, United States.

Frontiers in Immunology
|January 11, 2020
PubMed
Summary
This summary is machine-generated.

C-type lectin-like (CLEC) receptors on dendritic cells (DCs) are crucial for immune responses. How these receptors are engaged determines whether T cells are activated for immunity or tolerance.

Keywords:
CLEC10ADEC205anergycalciumdectin-1endocytosisimmunosuppressionmannose receptor

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Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Phagocytic cells, including dendritic cells (DCs), use C-type (Ca2+-dependent) lectin-like (CLEC) receptors to detect pathogens and danger signals.
  • CLEC receptors on DCs are vital for initiating immune responses by presenting antigens to T cell receptors (TCRs) and interacting with co-stimulatory molecules.
  • The sequential activation of DCs and T cells, along with cytokine production (IL-12, IFN-α/β), is essential for T cell differentiation and expansion.

Purpose of the Study:

  • To explore the dual role of CLEC receptor engagement on DCs in modulating T cell responses.
  • To illustrate how CLEC receptor interactions can lead to either immune activation or immune tolerance.
  • To highlight specific CLEC receptors (Dectin-1, DEC205, Mannose Receptor, CLEC10A) involved in these processes.

Main Methods:

  • Review of existing literature on CLEC receptor function in phagocytic cells, particularly DCs.
  • Analysis of the sequential events required for T cell activation, including antigen presentation, co-stimulation, and cytokine signaling.
  • Case studies examining the impact of specific CLEC receptors (Dectin-1, DEC205, Mannose Receptor, CLEC10A) on immune outcomes.

Main Results:

  • The manner in which CLEC receptors on DCs are engaged dictates the subsequent T cell response.
  • Improper sequencing or lack of inflammatory signals during DC-T cell interaction can result in T cell unresponsiveness, deletion, or regulatory T cell induction.
  • Specific CLEC receptors play distinct roles in determining the balance between immunity and tolerance.

Conclusions:

  • CLEC receptors are key regulators of immune responses, acting as critical checkpoints for initiating adaptive immunity or inducing tolerance.
  • Understanding the specific engagement patterns of CLEC receptors is crucial for developing targeted immunotherapies.
  • The examples of Dectin-1, DEC205, Mannose Receptor, and CLEC10A demonstrate the diverse functional outcomes mediated by CLEC receptors on DCs.