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Related Experiment Videos

Eosinophils: a review.

B J McEwen1

  • 1Department of Pathology, Ontario Veterinary College, University of Guelph, Canada.

Veterinary Research Communications
|January 1, 1992
PubMed
Summary
This summary is machine-generated.

Eosinophils, discovered in 1846, are key immune cells traditionally seen as protective against parasites and in allergic reactions. However, recent research highlights their paradoxical role in causing tissue damage, challenging their benign modulator status.

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Area of Science:

  • Immunology
  • Cell Biology
  • Hematology

Background:

  • Eosinophils, identified in 1846 and named by Paul Ehrlich in 1879, are characterized by basic proteins in their granules that bind acidic dyes.
  • Traditionally, eosinophils are recognized for their roles in combating parasitic infections and modulating Type I hypersensitivity reactions.
  • These functions, involving cationic proteins and enzymes, contrast with their proposed regulatory roles in inflammation, presenting an enigma.

Purpose of the Study:

  • To provide a concise overview of the structure and biology of mammalian eosinophils.
  • To emphasize the dual and often contradictory functions of eosinophils in biological systems.
  • To explore the complex role of eosinophils beyond their traditional classifications.

Main Methods:

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  • Literature review of historical and recent scientific publications.
  • Analysis of studies on eosinophil function in parasitic infestations and hypersensitivity.
  • Examination of research investigating eosinophil interactions with the cellular immune system.

    • Main Results:

    • Eosinophils possess potent parasiticidal capabilities due to their granular cationic proteins and enzymes.
    • Evidence suggests eosinophils can act as modulators of inflammation, but also as agents of tissue destruction.
    • The presence of eosinophils does not exclusively indicate IgE-mediated hypersensitivity, as shown by their interaction with cellular immunity.

    Conclusions:

    • Eosinophils exhibit a paradoxical role, acting as both effectors of tissue damage and regulators of inflammation.
    • The traditional view of eosinophils solely as protective or regulatory cells is challenged by emerging evidence.
    • Understanding the complex biology of eosinophils is crucial for comprehending their impact on health and disease.