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Cells of the Innate Immune Response01:28

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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.
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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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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.
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 transcription factor NF-κB was discovered in 1986 in the lab of Nobel laureate Professor David Baltimore, for its interaction with the immunoglobulin light chain enhancer in B-cells. After more than three decades of study, it is now evident that NF-κB regulates the expression of over 100 genes. Most of these genes play an essential role in the innate and adaptive immune responses as well as the inflammatory responses of animals.
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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.
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The extrinsic apoptotic pathway is initiated when extracellular death-inducing signals, such as specific cytokines, activate the death receptors expressed on the cell surface. The immune cells involved in this pathway are natural killer cells (NK cells) and cytotoxic T-lymphocytes. NK cells are critical in innate immune response, while cytotoxic T-lymphocytes are associated with adaptive immune response. These cells recognize specific receptors expressed on the altered cells and activate...
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Measurement of Natural Killer Cell-Mediated Cytotoxicity and Migration in the Context of Hepatic Tumor Cells
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Dok1 and Dok2 proteins regulate natural killer cell development and function.

Javier Celis-Gutierrez1, Marilyn Boyron2, Thierry Walzer3

  • 1INSERM U1068 Centre de Recherche en Cancérologie de Marseille, Marseille, France Institut Paoli-Calmettes, Marseille, France CNRS UMR7258 Centre de Recherche en Cancérologie de Marseille, Marseille, France Aix-Marseille Université, Marseille, France.

The EMBO Journal
|June 26, 2014
PubMed
Summary
This summary is machine-generated.

Dok1 and Dok2 proteins regulate natural killer (NK) cell activation. These molecules form a negative feedback loop, ensuring proper immune responses against tumors and microbes.

Keywords:
Dok moleculesadaptor proteinscell signalingcytokine productionnatural killer cells

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Area of Science:

  • Immunology
  • Cellular Biology
  • Molecular Signaling

Background:

  • Natural killer (NK) cells are crucial for innate immunity against viral infections and tumors.
  • NK cell activity is tightly regulated by activating and inhibitory signals to maintain immune homeostasis.
  • Intrinsic and extrinsic mechanisms control NK cell tolerance and effector functions.

Purpose of the Study:

  • To investigate the role of cytoplasmic signaling molecules Dok1 and Dok2 in NK cell regulation.
  • To elucidate the involvement of Dok1 and Dok2 in the signaling pathways downstream of NK cell-activating receptors.

Main Methods:

  • Analysis of Dok1 and Dok2 tyrosine phosphorylation in activated human NK cells.
  • Overexpression studies of Dok proteins in human NK cells.
  • Gene ablation studies in mice to assess NK cell maturation and function.

Main Results:

  • Dok1 and Dok2 undergo tyrosine phosphorylation following NK cell activation.
  • Increased expression of Dok1 and Dok2 inhibits NK cell activation mediated by activating receptors.
  • Genetic deletion of Dok1 and Dok2 in mice results in impaired NK cell maturation.
  • Dok1 and Dok2 deficiency leads to enhanced Interferon-gamma (IFN-γ) production in response to activating stimuli.

Conclusions:

  • Dok1 and Dok2 function as key negative regulators in NK cell signaling.
  • These proteins are involved in an intrinsic negative feedback mechanism downstream of NK cell-activating receptors.
  • Dok1 and Dok2 play conserved roles in regulating NK cell responses in both mice and humans.