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Related Concept Videos

Cells of the Innate Immune Response01:28

Cells of the Innate Immune Response

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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 by NK Cells and Phagocytes01:25

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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.
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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.
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The Extrinsic Apoptotic Pathway01:17

The Extrinsic Apoptotic Pathway

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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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Phagocytosis of Apoptotic Cells01:17

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Cells undergoing apoptosis form apoptotic bodies that must be removed immediately to prevent inflammation, autoimmune diseases, and necrosis. Phagocytosis is carried out by professional phagocytes such as macrophages or  immature dendritic cells. Non-professional phagocytes such as  epithelial cells and fibroblasts also take part in this process; however, they are not as effective as professional phagocytes. 
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Related Experiment Video

Updated: Oct 25, 2025

Measurement of Natural Killer Cell-Mediated Cytotoxicity and Migration in the Context of Hepatic Tumor Cells
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How natural killer cells avoid self-destruction when killing their targets.

Hannah Wurzer1,2, Liza Filali1, Clément Thomas1

  • 1Cytoskeleton and Cancer Progression, Department of Oncology, Luxembourg Institute of Health, Luxembourg City, Luxembourg.

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Natural killer (NK) cells possess unique defense mechanisms to prevent self-harm during immune responses. This study reveals how these crucial immune cells protect themselves from their own cytotoxic weapons when attacking diseased cells.

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Flow Cytometry-based Assay for the Monitoring of NK Cell Functions
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Area of Science:

  • Immunology
  • Cellular Biology
  • Molecular Medicine

Background:

  • Cytotoxic lymphocytes, such as natural killer (NK) cells, eliminate diseased cells through targeted release of cytotoxic granules.
  • A critical question in immunology is how these effector cells avoid self-destruction from their own cytotoxic molecules.
  • Understanding NK cell self-protection is vital for immune system regulation and therapeutic development.

Purpose of the Study:

  • To elucidate the specific molecular mechanisms underlying NK cell protection against autologous cytotoxic granule-mediated damage.
  • To identify key pathways and molecules involved in preventing NK cell apoptosis during target cell engagement.

Main Methods:

  • Utilized advanced microscopy techniques to visualize NK cell interactions with target cells.
  • Employed genetic and pharmacological approaches to dissect the roles of specific proteins in NK cell survival.
  • Analyzed gene expression and protein localization during cytotoxic immune responses.

Main Results:

  • Identified a novel protective mechanism involving the rapid polarization of cytotoxic granules away from the NK cell nucleus.
  • Demonstrated that specific adaptor proteins are essential for orchestrating this protective response.
  • Showcased that NK cells can actively downregulate pro-apoptotic signaling upon granule exocytosis.

Conclusions:

  • NK cells employ sophisticated strategies to ensure their survival while performing cytotoxic functions.
  • The findings provide new molecular targets for modulating immune responses and enhancing NK cell-based therapies.
  • This research deepens our understanding of immune cell homeostasis and self-recognition.