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Related Experiment Videos

Characterization of eosinophil homotypic aggregation

M M Teixeira1, T J Williams, B T Au

  • 1Department of Applied Pharmacology, National Heart & Lung Institute, London, UK.

Journal of Leukocyte Biology
|February 1, 1995
PubMed
Summary

Guinea pig eosinophils aggregate when stimulated by platelet-activating factor (PAF) and leukotriene B4 (LTB4). This aggregation is a reliable indicator of eosinophil activation, requiring specific ions and partially involving CD18.

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Area of Science:

  • Immunology
  • Cell Biology

Background:

  • Eosinophils play a role in inflammatory responses.
  • Understanding eosinophil activation mechanisms is crucial for studying allergic diseases.

Purpose of the Study:

  • To investigate eosinophil aggregation as a measure of eosinophil activation.
  • To characterize the stimuli and conditions that induce eosinophil aggregation.

Main Methods:

  • Stimulation of guinea pig peritoneal eosinophils with various agonists including platelet-activating factor (PAF), leukotriene B4 (LTB4), and C5a.
  • Assessment of aggregation using light transmission changes and confirmed with light microscopy.
  • Investigation of ion requirements (Ca2+, Mg2+) and desensitization patterns.
  • Evaluation of the role of diacylglycerol kinase inhibitor R59022 and the adhesion glycoprotein CD18.

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Main Results:

  • PAF, LTB4, and C5a induced rapid, concentration-dependent, and partially reversible eosinophil aggregation.
  • Phorbol myristate acetate induced slower, irreversible aggregation.
  • Homologous but not heterologous desensitization was observed for PAF and LTB4.
  • Aggregation required both Ca2+ and Mg2+.
  • Superoxide anion generation was enhanced by R59022, while aggregation was augmented for LTB4 but not PAF.
  • Eosinophil aggregation was partially dependent on CD18.

Conclusions:

  • Eosinophil aggregation is a reliable and measurable indicator of eosinophil activation.
  • Specific agonists and conditions modulate eosinophil aggregation.
  • The findings provide insights into the signaling pathways involved in eosinophil activation.