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Related Concept Videos

Cytotoxic T Cells-mediated Immune Response01:27

Cytotoxic T Cells-mediated Immune Response

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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.
Immunological surveillance is the ability of immune cells to monitor and eliminate infected cells with intracellular pathogens, neoplastically transformed cells, and cells with non-self antigens. Cytotoxic T cells and NK...
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The innate immune response is an immediate and non-specific response against pathogens, acting swiftly to prevent the spread of infections. The primary cells involved in this response are phagocytes and natural killer (NK) cells.
Phagocytes
Phagocytes police the peripheral tissues by removing cellular debris and responding to the invasion of foreign substances or pathogens. Many phagocytes attack and remove microorganisms even before lymphocytes detect them. The human body has two general...
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Immune surveillance is an integral part of the innate immune system, involving the continuous monitoring of peripheral tissues to detect and respond to pathogens, infected cells, or cancerous cells. This surveillance is conducted primarily by natural killer (NK) cells and phagocytes, which employ distinct but complementary mechanisms to identify and eliminate threats.
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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.
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T Cell Types and Functions01:24

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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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Measurement of Natural Killer Cell-Mediated Cytotoxicity and Migration in the Context of Hepatic Tumor Cells
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Themis2 regulates natural killer cell memory function and formation.

Tsukasa Nabekura1,2,3, Elfira Amalia Deborah4,5, Saeko Tahara4,6,7

  • 1Life Science Center for Survival Dynamics, Tsukuba Advanced Research Alliance (TARA), University of Tsukuba, Ibaraki, 305-8575, Japan. nabekura.tsukasa.fe@u.tsukuba.ac.jp.

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|November 8, 2023
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The scaffold protein Themis2 regulates natural killer (NK) cell memory. Themis2 deficiency enhances memory NK cell formation and host protection against mouse cytomegalovirus (MCMV) infection.

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Area of Science:

  • Immunology
  • Cell Biology
  • Infectious Disease

Background:

  • Immunological memory is a key feature of adaptive immunity.
  • Natural killer (NK) cells, crucial for innate defense, can develop into memory NK cells.
  • The molecular pathways governing memory NK cell differentiation remain incompletely understood.

Purpose of the Study:

  • To identify key regulators of memory NK cell differentiation and function.
  • To elucidate the role of the scaffold protein Themis2 in NK cell memory.
  • To investigate the molecular mechanisms underlying Themis2-mediated regulation of NK cell memory.

Main Methods:

  • Analysis of Themis2-deficient NK cells in vitro and in vivo.
  • Assessment of NK cell differentiation and effector function.
  • Investigation of signaling pathways involving Ly49H, ZAP70/Syk, and Zfp740.
  • Mouse cytomegalovirus (MCMV) infection models.

Main Results:

  • Themis2 deficiency leads to enhanced differentiation of memory NK cells.
  • Themis2-deficient NK cells provide augmented protection against MCMV infection.
  • Themis2 inhibits Ly49H signaling by attenuating ZAP70/Syk phosphorylation.
  • Themis2 interacts with Zfp740 in the nucleus to regulate memory NK cell persistence.

Conclusions:

  • Themis2 is a critical regulator of both quantitative and qualitative aspects of NK cell memory formation.
  • The Themis2-Zfp740 pathway is important for controlling the persistence and function of memory NK cells.
  • Targeting Themis2 may offer novel strategies for modulating NK cell-based immunity.