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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...

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PKCtheta and Itk functionally interact during primary mouse CD3+ T cell activation.

Nikolaus Thuille¹, Christina Lutz-Nicoladoni, Thomas Letschka

¹Department for Medical Genetics, Molecular and Clinical Pharmacology, Medical University of Innsbruck, Innsbruck, Austria. Nikolaus.Thuille@i-med.ac.at

Immunology Letters

|August 18, 2009

Summary

Protein kinase C theta (PKCtheta) and Interleukin-2-inducible T-cell kinase (Itk) are crucial for T cell signaling. Their combined deficiency partially rescues T cell activation defects, suggesting complex crosstalk in T cell receptor signaling.

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Area of Science:

Immunology
Molecular Biology
Cell Signaling

Background:

Protein kinase C theta (PKCtheta) and Interleukin-2-inducible T-cell kinase (Itk) are key kinases in T lymphocyte signal transmission.
A functional interaction between PKCtheta and Itk during T cell development and response is hypothesized.

Purpose of the Study:

To investigate the functional crosstalk between PKCtheta and Itk in T cell activation.
To elucidate the roles of PKCtheta and Itk in T cell receptor signaling pathways.

Main Methods:

Generation of PKCtheta/Itk double knockout mice.
Comparison of T cell activation responses in double knockout, single knockout, and wild-type mice.
Ex vivo analysis of cytokine secretion and transactivation responses (NFAT/AP-1, NF-kappaB).

Main Results:

Both Itk and PKCtheta are required for modulating CD3(+) T cell cytokine secretion.
Itk- and PKCtheta-deficient T cells exhibit impaired NFAT/AP-1 and NF-kappaB transactivation.
Combined deficiency partially rescued the severe NFAT and NF-kappaB activation defects seen in Itk single-deficient T cells.

Conclusions:

The study provides evidence for a complex functional crosstalk between Itk and PKCtheta during T cell receptor signaling.
The findings suggest that the interplay between these kinases is more intricate than previously understood.