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Related Concept Videos

T Cell Activation and Clonal Selection01:22

T Cell Activation and Clonal Selection

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T cells are integral to our adaptive immune system, recognizing and effectively responding to foreign antigens. T cell activation and clonal selection are pivotal in orchestrating this immune response. This article elucidates these mechanisms, detailing the roles of cluster of differentiation (CD) markers, major histocompatibility complex (MHC) molecules, costimulatory signals, and the process of clonal selection.
Naive T cells that have not yet encountered an antigen express two primary CD...
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Integrated Cross-Species Analysis Identifies a Conserved Transitional Dendritic Cell Population.

Rebecca Leylek1, Marcela Alcántara-Hernández1, Zachary Lanzar1

  • 1Microbiology & Immunology Department and Immunology Program, Stanford University School of Medicine, Stanford, CA 94305, USA.

Cell Reports
|December 12, 2019
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Summary

Researchers discovered a new type of transitional dendritic cell (tDC) in mice, which specializes in antigen presentation rather than type I interferon (IFN-I) production. This finding helps classify immune cell diversity and offers potential therapeutic targets.

Keywords:
ASDCAXL(+) dendritic cellsCyTOFhumanmousenoncanonical dendritic cellsplasmacytoid dendritic cellspre-DCstransitional dendritic cellsviral infection

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Area of Science:

  • Immunology
  • Cell Biology
  • Single-cell analysis

Background:

  • Plasmacytoid dendritic cells (pDCs) are crucial immune sensors with varied functions, including type I interferon (IFN-I) production and antigen presentation.
  • The precise regulation of pDC functions and the existence of specialized subpopulations remain incompletely understood.

Purpose of the Study:

  • To investigate the diversity within pDC populations using high-dimensional single-cell analysis.
  • To identify and characterize functionally distinct pDC subpopulations in mice.
  • To establish cross-species comparisons for understanding human and murine dendritic cell populations.

Main Methods:

  • Mass cytometry (CyTOF) was employed for high-dimensional single-cell analysis of murine immune cells.
  • Cross-species comparative analysis was conducted to compare murine and human dendritic cell populations.
  • Developmental and recruitment dynamics during viral infection were studied.

Main Results:

  • A distinct murine pDC-like population was identified, characterized by specialization in antigen presentation and limited IFN-I production.
  • This population was identified as the murine equivalent of human AXL+ DCs, unified under the term transitional DCs (tDCs).
  • tDCs exhibit characteristics transitional between pDCs and conventional type 2 dendritic cells (cDC2s) and share developmental and recruitment traits with pDCs.

Conclusions:

  • The study defines a new dendritic cell subset, transitional DCs (tDCs), in mice with distinct immune functions.
  • This research provides a framework for understanding the roles of pDCs and tDCs in disease pathogenesis.
  • The findings may pave the way for novel therapeutic strategies targeting dendritic cell functions in various diseases.