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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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Inhibition of Cdk Activity02:34

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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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Cytotoxic T Cells-mediated Immune Response01:27

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Cytotoxic T cells are a vital component of the immune system. They have the remarkable ability to identify and target antigens on infected or abnormal cells. These antigens often originate from intracellular pathogens such as viruses or abnormal proteins cancer cells produce.
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Related Experiment Video

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Metabolic programming and PDHK1 control CD4+ T cell subsets and inflammation.

Valerie A Gerriets, Rigel J Kishton, Amanda G Nichols

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    Inflammatory CD4+ effector T cells (Teffs) use glycolysis, while regulatory T cells (Tregs) use oxidative metabolism. Inhibiting pyruvate dehydrogenase kinase 1 (PDHK1) selectively targets Teffs, offering a potential strategy for autoimmune diseases.

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    Area of Science:

    • Immunology
    • Cellular Metabolism
    • Molecular Biology

    Background:

    • CD4+ T cell activation leads to effector (Teff) and regulatory (Treg) subsets with distinct metabolic needs.
    • Understanding these metabolic differences is crucial for controlling T cell populations in inflammatory diseases.

    Purpose of the Study:

    • To investigate the distinct metabolic pathways of CD4+ Teff and Treg subsets.
    • To identify key metabolic regulators that control T cell differentiation and function.
    • To explore therapeutic targeting of T cell metabolism in autoimmune conditions.

    Main Methods:

    • Murine models were used to analyze CD4+ T cell populations.
    • Metabolic profiling identified pyruvate dehydrogenase (PDH) as a critical metabolic regulator.
    • Gene expression analysis and knockdown experiments targeted PDH kinases (PDHKs), specifically PDHK1.

    Main Results:

    • Inflammatory Teffs exhibit high glycolytic rates, whereas Tregs rely on oxidative metabolism.
    • PDHK1 expression is specific to Th17 cells, and its inhibition selectively suppressed Th17 cells while promoting Treg differentiation.
    • PDHK1 inhibition modulated immune responses and protected against experimental autoimmune encephalomyelitis by reducing Th17 cells and increasing Tregs, partly via reactive oxygen species (ROS).

    Conclusions:

    • CD4+ T cell subsets utilize distinct metabolic programs, with PDH acting as a key metabolic checkpoint.
    • Targeting PDHK1 offers a potential therapeutic strategy to rebalance T cell populations and treat autoimmune and inflammatory diseases.