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Related Concept Videos

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Advanced Imaging of Lung Homing Human Lymphocytes in an Experimental In Vivo Model of Allergic Inflammation Based on Light-sheet Microscopy
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Small Extracellular Vesicle Signaling and Mitochondrial Transfer Reprograms T Helper Cell Function in Human Asthma.

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    Asthma airway inflammation is worsened by myeloid-derived regulatory cell (MDRC) small extracellular vesicles (sEVs) transferring mitochondria to T cells. Blocking this mitochondrial transfer and signaling offers a potential therapeutic target for asthma.

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    Area of Science:

    • Immunology
    • Cell Biology
    • Respiratory Medicine

    Background:

    • Small extracellular vesicles (sEVs) mediate intercellular communication.
    • Myeloid-derived regulatory cells (MDRCs) influence T cell responses in asthma.
    • The role of sEVs and mitochondria in asthma pathogenesis is not fully understood.

    Purpose of the Study:

    • To investigate the role of MDRC-derived sEVs and mitochondrial transfer in asthmatic airway inflammation.
    • To elucidate the mechanisms of sEV-mediated mitochondrial signaling in T cell activation and polarization.
    • To explore potential therapeutic targets for asthma.

    Main Methods:

    • Analysis of MDRC-derived sEVs from asthmatic patients.
    • Investigating T cell activation and polarization upon sEV internalization.
    • Utilizing in vivo murine models of asthma to assess the impact of sEVs and mitochondria.

    Main Results:

    • Asthmatic MDRC-derived sEVs transfer mitochondria to CD4+ T cells, inducing antigen-specific activation and Th17/Th2 polarization.
    • T cell activation is mediated by sEV mitochondrial oxidant signaling and reactive oxygen species.
    • Mitochondrial fission (Drp1-dependent) is crucial for packaging mitochondria into sEVs, which enhance airway inflammation in vivo.

    Conclusions:

    • MDRC-derived sEVs play a significant role in perpetuating asthmatic airway inflammation through mitochondrial transfer and signaling.
    • Dysregulated T cell activation and Th cell polarization via sEV-mediated mitochondrial transfer represent a novel therapeutic avenue for asthma.
    • Targeting mitochondrial fission and sEV-mediated mitochondrial transfer could mitigate asthma pathology.