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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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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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Immune Response Against Viral Pathogens01:29

Immune Response Against Viral Pathogens

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The immune system's response to viral infections is a complex and coordinated process involving natural killer (NK) cells, T cell-mediated responses, and antibody-mediated responses.
NK Cells
NK cells are a crucial part of our innate immune system, acting as the first line of defense against viral infections. These cells can recognize and kill infected cells without prior exposure to the virus, effectively slowing down the spread of infection. Additionally, NK cells produce proinflammatory...
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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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Enhanced IL-15-mediated NK cell activation and proliferation by an ADAM17 function-blocking antibody involves CD16A,

Anders W Matson1, Rob Hullsiek2, Kate J Dixon3

  • 1Graduate Program in Comparative and Molecular Biosciences, University of Minnesota, Saint Paul, Minnesota, USA.

Journal for Immunotherapy of Cancer
|July 25, 2024
PubMed
Summary

Inhibiting ADAM17 with the Medi-1 antibody enhances IL-15-driven natural killer (NK) cell activation and proliferation. This novel strategy boosts NK cell antitumor activity, offering therapeutic potential for cancer treatment.

Keywords:
AntibodyCytokineImmune Checkpoint InhibitorImmune modulatoryInnate

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Area of Science:

  • Immunology
  • Cell Biology
  • Cancer Therapy

Background:

  • Natural killer (NK) cells are crucial for cancer immunotherapy, activated by tumor cell ligands and cytokines like IL-15.
  • The protease ADAM17 negatively regulates NK cell function by cleaving cell-surface receptors.
  • Inhibiting ADAM17 can enhance IL-15-mediated NK cell proliferation, a mechanism requiring further investigation.

Purpose of the Study:

  • To investigate the mechanism by which ADAM17 inhibition enhances IL-15-driven NK cell proliferation.
  • To explore the role of CD16A and CD137 in mediating the effects of ADAM17 inhibition.

Main Methods:

  • Cultured human peripheral blood mononuclear cells (PBMCs) or enriched NK cells with rhIL-15 and/or an ADAM17 function-blocking antibody (Medi-1 and variants).
  • Assessed NK cell proliferation and phenotype using flow cytometry.
  • Examined CD16A signaling via immunoblotting and measured NK cell antitumor activity using live cell imaging.

Main Results:

  • The ADAM17 blocking antibody Medi-1 significantly enhanced early NK cell activation by IL-15.
  • CD16A engagement with Medi-1 blocked ADAM17 shedding, prolonging NK cell signaling without inducing dysfunction.
  • Synergistic signaling between Medi-1 and IL-15 upregulated CD137 on CD16A+ NK cells, augmenting proliferation with accessory cells.

Conclusions:

  • CD16A and CD137 mediate the enhanced NK cell activation and proliferation induced by Medi-1 and IL-15.
  • Medi-1 represents a novel therapeutic strategy to boost IL-15-driven NK cell proliferation.
  • This approach holds potential for increasing NK cell antitumor activity in cancer patients.