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Related Experiment Videos

Functional differences of human basophils with different densities.

Y Morita1, M Asakawa, K Hirai

  • 1Department of Medicine and Physical Therapy, Faculty of Medicine, University of Tokyo, Japan.

International Archives of Allergy and Applied Immunology
|January 1, 1989
PubMed
Summary

Blood basophil populations exhibit distinct responses to stimuli. Band-2 basophils show enhanced histamine release to anti-IgE and formyl-methionyl-leucyl-phenylalanine, while band-1 basophils are more sensitive to calcium ionophore A23187.

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Area of Science:

  • Immunology
  • Cell Biology

Background:

  • Blood basophils are known to exist in at least two populations with differing densities.
  • Understanding these subpopulations is crucial for comprehending allergic responses and developing targeted therapies.

Purpose of the Study:

  • To compare the functional responses of two distinct basophil density populations (band-1 and band-2) to various secretagogues and anti-allergic agents.
  • To investigate potential differences in histamine release and sensitivity to stimuli between these basophil subsets.

Main Methods:

  • Basophils were isolated from healthy subjects and patients with bronchial asthma or Japanese cedar pollinosis using density gradient centrifugation with Percoll.
  • Two distinct populations, band-1 and band-2 basophils, were collected based on their density interfaces.

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  • The histamine release from each population was measured in response to stimulation with anti-IgE, formyl-methionyl-leucyl-phenylalanine (fMLP), and the calcium ionophore A23187.

    • Main Results:

    • Band-2 basophils demonstrated significantly higher histamine release in response to anti-IgE and fMLP compared to band-1 basophils.
    • Band-1 basophils exhibited greater sensitivity to stimulation by the calcium ionophore A23187 than band-2 basophils.
    • These differential responses suggest distinct functional roles for the two basophil populations.

    Conclusions:

    • Blood basophils comprise functionally distinct subpopulations with varying sensitivities to different stimuli.
    • Band-2 basophils appear more responsive to immunological and chemotactic signals, while band-1 basophils are more reactive to direct calcium influx.
    • These findings contribute to a deeper understanding of basophil heterogeneity and their roles in allergic and inflammatory conditions.