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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...

Inhibition of Cdk Activity

Inhibition of Cdk Activity

The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...

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Updated: Jul 16, 2026

Tailoring In Vivo Cytotoxicity Assays to Study Immunodominance in Tumor-specific CD8+ T Cell Responses

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A role for CD44 in T cell development and function during direct competition between CD44+ and CD44- cells.

Victoria A Graham¹, Amanda L Marzo, David F Tough

¹The Edward Jenner Institute for Vaccine Research, Compton, Newbury, Berkshire, UK.

European Journal of Immunology

|March 3, 2007

Summary

CD44 is crucial for T cell development and function. CD44-deficient T cells show reduced development and impaired responses to infection, highlighting CD44's essential role in T cell biology.

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Area of Science:

Immunology
Cell Biology

Background:

The function of CD44, a cell adhesion molecule, in T cell biology is not fully understood.
Previous studies suggest CD44 involvement in T cell processes, but CD44-deficient mice show limited T cell defects.

Purpose of the Study:

To investigate the role of CD44 in T cell development and mature T cell function.
To analyze T cell competition between CD44-deficient and wild-type cells.

Main Methods:

Generation of mixed bone marrow chimeras with CD44-deficient (CD44(-/-)) and wild-type (WT, CD44(+/+)) cells.
Assessment of T cell development within the thymus.
Evaluation of mature T cell responses following lymphocytic choriomeningitis virus infection in mice.

Main Results:

CD44(-/-) T cell development in the thymus was reduced compared to WT cells.
Mature CD44(-/-) CD8(+) T cells exhibited a significantly lower response to viral infection than WT T cells.
Impaired T cell responses were observed in both lymphoid and non-lymphoid tissues.

Conclusions:

CD44 plays a critical role in intrathymic T cell development.
CD44 is essential for optimal mature T cell function and response to viral infections.
CD44-deficient T cells have a reduced capacity to compete with wild-type T cells.