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T Cell Activation and Clonal Selection

T Cell Activation and Clonal Selection

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...

T Cell Types and Functions

T Cell Types and Functions

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 4, 2025

A Three-dimensional Thymic Culture System to Generate Murine Induced Pluripotent Stem Cell-derived Tumor Antigen-specific Thymic Emigrants

A Three-dimensional Thymic Culture System to Generate Murine Induced Pluripotent Stem Cell-derived Tumor Antigen-specific Thymic Emigrants

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Id3 expression identifies CD4⁺ memory Th1 cells.

Laura A Shaw¹, Tianda Z Deng¹, Kyla D Omilusik¹

¹Department of Biological Sciences, University of California, La Jolla, CA 92093.

Proceedings of the National Academy of Sciences of the United States of America

|July 20, 2022

Summary

This summary is machine-generated.

Id3 expression identifies multipotent memory CD4+ T cells. These cells, found in T follicular helper and T helper 1 lineages, can re-expand and generate diverse effector cells during secondary infections, crucial for long-term immunity.

Keywords:

CD4 T cell Th1 memory

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Generation of Induced Regulatory T Cells from Primary Human Naïve and Memory T Cells

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Published on: April 16, 2012

Area of Science:

Immunology
Cell Biology
Vaccinology

Background:

Memory CD4+ T cells are crucial for long-term immunity and vaccine development.
Identifying specific memory precursor cells among diverse CD4+ T helper subsets remains challenging.
The lineage origin of secondary CD4+ T helper subsets from a single memory precursor is unclear.

Purpose of the Study:

To investigate the role of Id3 expression in identifying memory precursor CD4+ T cells.
To determine if Id3 marks multipotent memory CD4+ T cells with potential for diverse lineage generation.

Main Methods:

Analysis of CD4+ T cell subsets, including T follicular helper (Tfh) and T helper 1 (Th1) cells, following viral infection.
Assessment of Id3 expression as a marker for memory potential.
Evaluation of cell re-expansion and secondary effector cell generation upon re-infection.

Main Results:

Id3 expression identified a subset of CD4+ Tfh and Th1 cells with significant memory potential.
Id3-expressing Th1 cells in the memory phase showed enhanced expansion and generated both Th1 and Tfh effector cells.
Id3-expressing memory cells were enriched for molecules associated with memory potential compared to Id3-low cells.

Conclusions:

Id3 expression serves as a definitive marker for multipotent memory CD4+ T cells.
This finding clarifies the potential for lineage plasticity within memory CD4+ T cell subsets.
Id3 as a marker has implications for vaccine design and understanding adaptive immunity.