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Related Concept Videos

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
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Surface Membrane Barriers01:18

Surface Membrane Barriers

The skin and mucous membranes serve as the primary line of defense against pathogens by providing both physical and chemical protection. These barriers are essential in preventing the entry and establishment of microbes, thereby maintaining the integrity of the host.
The outer layer of the skin, the epidermis, is a robust barrier comprising layers of closely packed keratinized cells. This dense arrangement prevents microbes from penetrating the body. The periodic shedding of epidermal cells...
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.
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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.
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Antimicrobial Proteins01:23

Antimicrobial Proteins

Antimicrobial proteins are important components of the immune system. They aid the body in combating pathogens by either killing them directly or hindering their replication processes. Four main types of antimicrobial substances are interferons, the complement system, iron-binding proteins, and antimicrobial proteins.
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Related Experiment Video

Updated: Jul 7, 2026

Simultaneous Study of the Recruitment of Monocyte Subpopulations Under Flow In Vitro
09:16

Simultaneous Study of the Recruitment of Monocyte Subpopulations Under Flow In Vitro

Published on: November 26, 2018

Monocyte-mediated defense against microbial pathogens.

Natalya V Serbina1, Ting Jia, Tobias M Hohl

  • 1Infectious Diseases Service, Department of Medicine, Immunology Program, Sloan-Kettering Institute, Memorial Sloan-Kettering Cancer Center, New York, New York 10021, USA. serbinan@mskcc.org

Annual Review of Immunology
|February 29, 2008
PubMed
Summary
This summary is machine-generated.

Circulating monocytes are key immune cells that differentiate into macrophages and dendritic cells (DCs). Inflammatory monocytes, identified by CCR2, are crucial for fighting infections like Listeria and tuberculosis.

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Last Updated: Jul 7, 2026

Simultaneous Study of the Recruitment of Monocyte Subpopulations Under Flow In Vitro
09:16

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Published on: November 26, 2018

Prediction of Red Blood Cell Antibody Significance Using the Monocyte-Macrophage Assay
11:27

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Quantification of Monocyte Chemotactic Activity In Vivo and Characterization of Blood Monocyte Derived Macrophages
09:57

Quantification of Monocyte Chemotactic Activity In Vivo and Characterization of Blood Monocyte Derived Macrophages

Published on: August 12, 2019

Area of Science:

  • Immunology
  • Cell Biology

Background:

  • Circulating monocytes are essential precursors for tissue macrophages and dendritic cells (DCs).
  • Monocytes exist in subsets, with inflammatory monocytes trafficking to inflamed tissues and contributing to immune defense.
  • Inflammatory monocytes express CCR2 and are recruited to infection sites via MCP-1 (CCL2).

Purpose of the Study:

  • To investigate the role of inflammatory monocytes in host defense against microbial pathogens.
  • To elucidate the mechanisms of inflammatory monocyte recruitment and function during infection.

Main Methods:

  • Utilized murine models to study monocyte subsets and their roles in infection.
  • Examined CCR2-mediated monocyte trafficking in response to microbial stimuli.
  • Investigated the contribution of inflammatory monocytes to defense against bacterial, protozoal, and fungal pathogens.

Main Results:

  • CCR2-mediated monocyte recruitment is vital for defense against Listeria monocytogenes, Mycobacterium tuberculosis, Toxoplasma gondii, and Cryptococcus neoformans.
  • Inflammatory monocytes rapidly secrete cytokines and antimicrobial factors upon microbial stimulation.
  • Monocyte recruitment involves CCR2-mediated egress from bone marrow and subsequent trafficking to infected tissues.

Conclusions:

  • Inflammatory monocytes play a critical role in innate immunity against a diverse range of pathogens.
  • The CCR2-MCP-1 axis is essential for recruiting monocytes to sites of infection.
  • Further research is needed to fully understand the in vivo mechanisms of monocyte differentiation, trafficking, and microbial killing.