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Immune Surveillance by NK Cells and Phagocytes01:25

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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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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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Cells pull particles inward and engulf them in spherical vesicles in an energy-requiring process called endocytosis. Phagocytosis ("cellular eating") is one of three major types of endocytosis. Cells use phagocytosis to take in large objects, such as other cells (or their debris), bacteria, and even viruses.
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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.
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Leukocytes are classified into two groups based on the presence or absence of cytoplasmic granules. Granular leukocytes, which contain granules, belong to the myeloid lineage and are divided into three subtypes: neutrophils, eosinophils, and basophils. These cells are roughly spherical and characterized by the granules in their cytoplasm.
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Related Experiment Video

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Use of a Monocyte Monolayer Assay to Evaluate Fc&#947; Receptor-mediated Phagocytosis
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Human mononuclear phagocyte system reunited.

Muzlifah Haniffa1, Venetia Bigley1, Matthew Collin1

  • 1Human DC Lab, Institute of Cellular Medicine, Newcastle University, Newcastle upon Tyne NE2 4HH, UK.

Seminars in Cell & Developmental Biology
|May 20, 2015
PubMed
Summary
This summary is machine-generated.

The human mononuclear phagocyte network includes dendritic cells (DCs), monocytes, and macrophages, crucial for immunity. This review clarifies their classification, development, and functions in humans and mice.

Keywords:
Comparative biologyDendritic cellsMacrophagesMononuclear phagocytesOntogeny

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Area of Science:

  • Immunology
  • Cell Biology

Background:

  • The human mononuclear phagocyte network consists of dendritic cells (DCs), monocytes, and macrophages.
  • These cells are vital for immune functions, including antigen presentation, bridging innate and adaptive immunity.
  • Distinct subsets with unique functions and developmental pathways are increasingly understood in various tissues.

Purpose of the Study:

  • To review the current classification of human mononuclear phagocytes.
  • To compare the organization of this network in humans and mice.
  • To discuss the genetic control, developmental pathways, and immunological functions of distinct mononuclear phagocyte subsets.

Main Methods:

  • Comparative biology studies
  • Literature review of existing research on mononuclear phagocyte subsets
  • Analysis of genetic and cellular pathways

Main Results:

  • Emergence of a unified nomenclature for mononuclear phagocytes through comparative studies.
  • Identification of homologous subsets across different species.
  • Detailed discussion of distinct human and mouse mononuclear phagocyte subsets.

Conclusions:

  • The mononuclear phagocyte network is complex, with diverse subsets playing critical roles in immunity.
  • Understanding these subsets, their development, and functions is essential for comprehending health and inflammatory conditions.
  • Comparative studies are advancing a unified classification and understanding of these cells across species.