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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.
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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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Common myeloid progenitors (CMPs) are oligopotent cells that can differentiate into granulocytes and macrophages. Granulocytes and macrophages are essential for protecting the body against bacterial, viral, or fungal infections. They migrate from the bone marrow into the circulating blood to reach specific tissue sites where they differentiate and help in immune surveillance. However, they survive only for a few days and must be continuously made available to the organism to maintain a robust...
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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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Related Experiment Video

Updated: Feb 24, 2026

Morphological and Compositional Analysis of Neutrophil Extracellular Traps Induced by Microbial and Chemical Stimuli
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Morphological and Compositional Analysis of Neutrophil Extracellular Traps Induced by Microbial and Chemical Stimuli

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Innate Immune Function of Neutrophil Cytoplasts Generated Post-Vital NETosis.

Nithish Raj Prasad, Balaji Ganesh, Steven Dudek

    Biorxiv : the Preprint Server for Biology
    |February 23, 2026
    PubMed
    Summary
    This summary is machine-generated.

    Vital NETosis generates anuclear polymorphonuclear neutrophils (PMN cyto) that phagocytose bacteria and reduce lung injury in pneumonia. These cytoplasts show promise as a cell-based therapy for bacterial infections.

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    Development and Identification of a Novel Subpopulation of Human Neutrophil-derived Giant Phagocytes In Vitro
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    Development and Identification of a Novel Subpopulation of Human Neutrophil-derived Giant Phagocytes In Vitro

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    Area of Science:

    • Immunology
    • Cell Biology
    • Infectious Disease

    Background:

    • Polymorphonuclear neutrophils (PMNs) are key in innate immunity, migrating to infection sites like the lungs during pneumonia.
    • Neutrophil Extracellular Traps (NETs) are formed by PMNs, trapping pathogens but often studied via lytic NETosis.
    • Vital NETosis, producing anuclear PMN cytoplasts (PMN cyto) without cell lysis, is less understood.

    Purpose of the Study:

    • To investigate the function of PMN cyto in host defense during pneumonia.
    • To determine the therapeutic potential of PMN cyto in combating bacterial infections and lung injury.

    Main Methods:

    • Induction of pneumonia in mice using *Pseudomonas aeruginosa* (PA).
    • Utilized transgenic mice (tDTomato) to track PMN migration and PMN cyto generation.
    • Assessed PMN cyto phagocytosis, bactericidal activity, and effects on lung injury and mortality.
    • Investigated the role of mitochondria and PAD4 in PMN cyto function.

    Main Results:

    • PA pneumonia induced PMN transmigration and significant PMN cyto generation in lung airspace.
    • PMN cyto actively phagocytosed and killed PA, possessing intact plasma membranes and retained bactericidal pathways.
    • Instillation of PMN cyto reduced PA-induced lung injury and mortality, requiring functional mitochondria.
    • Genetic deletion of PAD4 enhanced PMN cyto generation and abrogated pneumonia-induced mortality.

    Conclusions:

    • PMN cyto generated via vital NETosis play a crucial role in host defense against pneumonia.
    • PMN cyto exhibit potent anti-bacterial functions and protective effects against lung injury.
    • PMN cyto represent a promising cell-based therapeutic strategy for bacterial pneumonia.