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Related Concept Videos

Immunodeficiency Diseases01:25

Immunodeficiency Diseases

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Immunodeficiency disorders are conditions in which the immune system's ability to fight infectious disease and cancer is compromised or entirely absent. The immune system comprises a complex network of cells, tissues, and organs that work together to protect the body from potentially harmful invaders. When this system is deficient or not functioning properly, it leaves the body susceptible to infections, diseases, or other complications.
There are three main causes of immunodeficiency...
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Immune Surveillance by NK Cells and Phagocytes01:25

Immune Surveillance by NK Cells and Phagocytes

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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.
Natural Killer Cells: The Fast Responders
NK cells are large granular lymphocytes found in the blood and lymphatic system. These...
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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.
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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Cell-mediated Immune Responses01:40

Cell-mediated Immune Responses

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Overview
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Phagocytosis of Apoptotic Cells01:17

Phagocytosis of Apoptotic Cells

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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. 
Normal cells contain receptors that prevent them from being recognized...
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Defense Against Bacterial Pathogens01:31

Defense Against Bacterial Pathogens

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The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
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Related Experiment Video

Updated: Jun 12, 2025

High Throughput Fluorometric Technique for Assessment of Macrophage Phagocytosis and Actin Polymerization
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Immunodeficiency: Quantitative and qualitative phagocytic cell defects.

David Mickey, Juanita Valdes Camacho, Adil Khan

    Allergy and Asthma Proceedings
    |September 19, 2024
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    Summary
    This summary is machine-generated.

    This primer reviews innate immune system defects in phagocytes, crucial cells for fighting infections. Understanding these phagocytic defects is key to diagnosing and treating related bacterial and fungal diseases.

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    Area of Science:

    • Immunology
    • Cell Biology

    Background:

    • The immune system comprises innate and adaptive branches.
    • Innate immunity provides rapid, non-specific defense against pathogens and injury.
    • Phagocytes (macrophages, monocytes, neutrophils) are key innate immune cells involved in pathogen clearance and debris removal.

    Purpose of the Study:

    • To review significant innate defects of phagocytic cells.
    • To highlight the clinical implications of phagocytic dysfunction.

    Main Methods:

    • This primer synthesizes current knowledge on phagocyte defects.
    • It focuses on specific functional impairments of phagocytic cells.

    Main Results:

    • Phagocytic defects lead to increased susceptibility to fungal and bacterial infections.
    • These defects are associated with conditions affecting the respiratory tract, skin, and lymph nodes.
    • Inflammatory bowel disease is also commonly linked to phagocyte disorders.

    Conclusions:

    • Defects in respiratory burst, neutrophil migration, and neutropenias are critical phagocyte disorders.
    • Understanding these defects is essential for managing recurrent infections and associated inflammatory conditions.