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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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T Cell Types and Functions01:24

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When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...
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Related Experiment Video

Updated: Sep 18, 2025

Visualizing Antigen Specific CD4+ T Cells using MHC Class II Tetramers
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CD73 Expression by CD4 + T Cells Marks Early Effector Memory T Cells.

Luxia Chen1, Sabine Ring1, Anna Jurga1

  • 1Department of Dermatology, University Hospital Heidelberg, Heidelberg, Germany.

Immunology
|June 27, 2025
PubMed
Summary
This summary is machine-generated.

CD73 on naive CD4+ T cells promotes their survival and proliferation. This ectoenzyme also marks cells for differentiation into effector T cells, enhancing immune responses.

Keywords:
5′ectonucleotidaseCD4+ T cellsCD73memory T cells

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Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • CD73 is a membrane-bound ectoenzyme that produces immunosuppressive adenosine.
  • CD73 is highly expressed on regulatory T cells but variably on conventional CD4+ T cells.

Purpose of the Study:

  • To investigate the distinct functions of CD73+ and CD73- naive CD4+ T cell subsets.
  • To determine the role of CD73 in T cell survival, proliferation, and differentiation.

Main Methods:

  • Flow cytometry to distinguish CD73+ and CD73- CD4+ T cells.
  • In vitro assays to assess proliferation and resistance to activation-induced cell death (AICD).
  • In vivo studies involving transfer into lymphopenic hosts to evaluate T cell behavior.

Main Results:

  • Naïve CD73+ CD4+ T cells showed superior proliferation and AICD resistance compared to CD73- counterparts.
  • CD73+ cells differentiated into a "Th1-like" phenotype, expressing IFN-γ, TNF-α, and Tbx21.
  • In vivo, CD73+ CD4+ T cells exhibited enhanced survival, proliferation, and developed an effector memory phenotype.

Conclusions:

  • CD73 acts as a promoter of survival and proliferation in naive CD4+ T cells.
  • CD73 serves as a marker for T cell differentiation into effector cells.
  • These findings highlight CD73's critical role in adaptive immunity and T cell effector functions.