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Related Concept Videos

T Cell Types and Functions01:24

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.
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T Cell Activation and Clonal Selection01:22

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.
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Inflammatory Response01:28

Inflammatory Response

An inflammatory response is a localized, nonspecific immune reaction that occurs when a tissue is injured. It is characterized by redness, swelling, heat, and pain, which are commonly called the cardinal signs and symptoms of inflammation. Inflammation can sometimes result in a loss of function.
Inflammation can be triggered by various stimuli, such as impact, abrasion, chemical irritation, infections, and extreme hot or cold temperatures. These can damage cells and connective tissue fibers,...

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Selective expression rather than specific function of Txk and Itk regulate Th1 and Th2 responses.

Nisebita Sahu1, Ana M Venegas, Dragana Jankovic

  • 1Center for Molecular Immunology and Infectious Disease and Department of Veterinary and Biomedical Sciences, Pennsylvania State University, University Park, PA 16802, USA.

Journal of Immunology (Baltimore, Md. : 1950)
|October 23, 2008
PubMed
Summary

Interleukin-2-inducible T-cell kinase (Itk) and Tyrosine kinase expressed in hepatocellular carcinoma (Txk) are Tec family kinases. Txk does not specifically regulate T-helper 1 (Th1) responses, suggesting Itk and Txk influence T-cell function via expression levels.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Signaling

Background:

  • Tec family kinases, including Itk and Txk, are crucial for T-cell function.
  • Itk is present in Th1 and Th2 cells, while Txk is predominantly in Th1 cells.
  • Existing research suggests Itk's role in Th2 responses and Txk's potential in Th1 regulation, but their distinct functions remain unclear.

Purpose of the Study:

  • To investigate the distinct roles of Itk and Txk in T-helper (Th) cell differentiation and function.
  • To determine if Txk specifically regulates Th1 responses or if its function is linked to expression levels.

Main Methods:

  • Analysis of Txk-null CD4(+) T cells for cytokine production.
  • Utilizing Itk-null mice with a Txk transgene to mimic Itk expression levels in Th2 cells.
  • Employing allergic asthma and schistosome egg-induced lung granuloma models to assess Th2 responses.

Main Results:

  • Txk-null CD4(+) T cells produced both Th1 and Th2 cytokines, similar to wild-type cells.
  • The Txk transgene in Itk-null mice rescued Th2 cytokine production and Th2 symptoms in asthma and granuloma models.
  • IFN-gamma expression was not significantly enhanced by the Txk transgene, indicating Txk is not a specific Th1 regulator.

Conclusions:

  • Txk does not appear to be a specific regulator of Th1 responses.
  • Itk and Txk likely exert their distinct effects on Th cell differentiation and function primarily through their expression levels.