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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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Lysosomes are the site for the degradation of macromolecules and biological polymers released during membrane trafficking events such as secretory, endocytic, autophagic, and phagocytic pathways. The membrane-enclosed area of the lysosome, called the lumen, contains hydrolytic enzymes active in an acidic environment. These acid hydrolases are functional at a pH between 4.5 and 5 and are involved in cellular processes such as cell signaling, energy metabolism, restoration of the plasma membrane,...
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Related Experiment Video

Updated: May 27, 2025

Measurement of Natural Killer Cell-Mediated Cytotoxicity and Migration in the Context of Hepatic Tumor Cells
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Mitochondrial dysfunction drives natural killer cell dysfunction in systemic lupus erythematosus.

Natalia W Fluder, Morgane Humbel, Emeline Recazens

    Medrxiv : the Preprint Server for Health Sciences
    |February 20, 2025
    PubMed
    Summary

    Systemic lupus erythematosus (SLE) impairs natural killer (NK) cells by causing mitochondrial dysfunction due to poor mitophagy. Restoring mitophagy with Urolithin A can improve NK cell function in SLE patients.

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    Analysis of Human Natural Killer Cell Metabolism
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    Area of Science:

    • Immunology
    • Cell Biology
    • Mitochondrial Biology

    Background:

    • Systemic lupus erythematosus (SLE) is an autoimmune disease marked by immune dysregulation and inflammation.
    • Natural killer (NK) cells are crucial for immune surveillance but show impaired function in SLE, including reduced cytotoxicity and cytokine production.
    • The precise mechanisms behind NK cell dysfunction in SLE, particularly concerning mitochondrial health, are not fully understood.

    Purpose of the Study:

    • To investigate the role of dysfunctional mitochondria and impaired mitophagy in NK cell impairment in SLE.
    • To explore potential therapeutic strategies for restoring NK cell function by targeting mitochondrial quality control in SLE.

    Main Methods:

    • Assessed mitochondrial structure and function in NK cells from 104 SLE patients and 104 healthy controls using flow cytometry, transmission electron microscopy, and proteomics.
    • Quantified mitophagy-related gene expression via RT-qPCR.
    • Evaluated the effects of Urolithin A (mitophagy activator) and hydroxychloroquine (HCQ) on mitochondrial recycling and NK cell function in vitro.

    Main Results:

    • SLE NK cells displayed enlarged, dysfunctional mitochondria, impaired lysosomal acidification, and increased cytosolic mitochondrial DNA leakage, indicating defective mitophagy.
    • Proteomic and transcriptomic analyses revealed downregulated mitophagy-related genes in SLE NK cells, correlating with diminished effector functions (degranulation, cytokine production).
    • In vitro treatment with Urolithin A enhanced mitophagy, improved mitochondrial and lysosomal function, and restored NK cell effector responses; HCQ showed partial recovery.

    Conclusions:

    • Mitochondrial dysfunction and impaired mitophagy are key contributors to NK cell abnormalities in SLE.
    • This study reveals a novel immunometabolic mechanism underlying SLE pathogenesis.
    • Targeting mitochondrial quality control pathways presents a promising therapeutic avenue for SLE.