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Related Concept Videos

Inflammation01:38

Inflammation

Overview
Defense Mechanism Against Infection01:26

Defense Mechanism Against Infection

Natural flora, body system defenses, and inflammation are natural barriers of the body against infectious agents regardless of previous exposure. Normal floras of the human body refer to the microbial population that colonizes the skin and mucous membranes.
In addition, many body organ systems have unique defenses against infection. The skin is an intact, multilayered surface preventing invasion by microorganisms unless impaired. Mucous membranes lining the mouth, nose, and eyelids are barriers...
Cells of the Innate Immune Response01:28

Cells of the Innate Immune Response

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...
Immune Surveillance by NK Cells and Phagocytes01:25

Immune Surveillance by NK Cells and Phagocytes

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...
Defense Against Bacterial Pathogens01:31

Defense Against Bacterial Pathogens

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...
Colonisation of Pathogens01:25

Colonisation of Pathogens

Pathogen colonization of host tissues is a critical step in the development of infectious diseases. Various pathogenic microorganisms, including bacteria, fungi, viruses, and protozoa, have evolved complex strategies to attach to, invade, and persist within host environments. These mechanisms enable pathogens to establish infections, evade immune responses, and resist antimicrobial treatments.Attachment to Host CellsIn bacteria, colonization typically begins with adherence to host epithelial...

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Related Experiment Video

Updated: Jun 18, 2026

Isolation, Purification and Labeling of Mouse Bone Marrow Neutrophils for Functional Studies and Adoptive Transfer Experiments
07:28

Isolation, Purification and Labeling of Mouse Bone Marrow Neutrophils for Functional Studies and Adoptive Transfer Experiments

Published on: July 10, 2013

Neutrophils and host defense.

R I Lehrer1, T Ganz, M E Selsted

  • 1Department of Medicine, UCLA School of Medicine.

Annals of Internal Medicine
|July 15, 1988
PubMed
Summary

Neutrophil dysfunction underlies frequent infections, impacting host defense. Understanding neutrophil receptors, oxidant production, and antimicrobial components aids clinical evaluation of immune disorders.

Area of Science:

  • Immunology
  • Cell Biology
  • Clinical Medicine

Background:

  • Neutrophils are primary phagocytes crucial for early infection response.
  • Neutropenia and neutrophil dysfunction are linked to increased infection susceptibility.
  • Recent research elucidates molecular underpinnings of neutrophil disorders.

Purpose of the Study:

  • To review neutrophil function in host defense.
  • To connect molecular pathology to clinical syndromes of frequent infections.
  • To guide physicians in evaluating patients with recurrent or unusual infections.

Main Methods:

  • Review of advances in neutrophil receptor function (recognition, movement, adhesion).
  • Analysis of chronic granulomatous disease pathogenesis for insights into oxidant production.

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Isolation and Characterization of Neutrophils with Anti-Tumor Properties

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Detecting Migration and Infiltration of Neutrophils in Mice

Published on: February 6, 2020

Related Experiment Videos

Last Updated: Jun 18, 2026

Isolation, Purification and Labeling of Mouse Bone Marrow Neutrophils for Functional Studies and Adoptive Transfer Experiments
07:28

Isolation, Purification and Labeling of Mouse Bone Marrow Neutrophils for Functional Studies and Adoptive Transfer Experiments

Published on: July 10, 2013

Isolation and Characterization of Neutrophils with Anti-Tumor Properties
10:15

Isolation and Characterization of Neutrophils with Anti-Tumor Properties

Published on: June 19, 2015

Detecting Migration and Infiltration of Neutrophils in Mice
10:33

Detecting Migration and Infiltration of Neutrophils in Mice

Published on: February 6, 2020

  • Identification and characterization of neutrophil antimicrobial components, including defensins.
  • Main Results:

    • Defined roles of neutrophil receptors in cellular processes.
    • Elucidated enzymatic machinery for antimicrobial oxidant production.
    • Characterized natural antibiotics like defensins and their role in host defense.

    Conclusions:

    • Understanding neutrophil molecular pathology is key to diagnosing immune dysfunction.
    • Knowledge of neutrophil function aids clinical assessment of frequent infections.
    • This review provides a clinical context for evaluating patients with neutrophil-related disorders.