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Related Experiment Videos

IL-4 release by human leukemic and activated normal basophils

M Arock1, H Merle-Béral, B Dugas

  • 1Immunology Department, CNRS URA625, Pitié-Salpêtrière Hospital, Paris, France.

Journal of Immunology (Baltimore, Md. : 1950)
|August 1, 1993
PubMed
Summary

Human basophils can produce Interleukin-4 (IL-4). This study found leukemic basophils spontaneously secrete IL-4, while normal basophils require activation, demonstrating basophil IL-4 production capabilities.

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Area of Science:

  • Immunology
  • Hematology
  • Cell Biology

Background:

  • Interleukin-4 (IL-4) is a key cytokine in immune responses.
  • The capacity of human basophils to produce IL-4 has been a recent area of investigation.
  • Chronic myelogenous leukemia (CML) can involve significant basophil proliferation.

Purpose of the Study:

  • To investigate IL-4 production by human basophils, particularly in the context of leukemia.
  • To compare IL-4 production in leukemic versus normal basophils.
  • To characterize the conditions required for IL-4 expression and secretion by basophils.

Main Methods:

  • Isolation and analysis of leukemic basophils from patients with CML.
  • Assay of IL-4 messenger RNA (mRNA) expression and protein secretion in vitro.

Related Experiment Videos

  • Purification of normal human basophils from bone marrow cultures.
  • Stimulation of basophils using Fc epsilon RI ligation and calcium ionophores.

    • Main Results:

    • Leukemic basophils (>90% purity) expressed IL-4 mRNA, contained IL-4 protein, and secreted IL-4 spontaneously in vitro.
    • IL-4 production by leukemic basophils increased upon activation.
    • Normal human basophils required in vitro activation (Fc epsilon RI ligation or ionophore) to express and secrete IL-4.
    • Both normal and leukemic basophils secreted histamine but not tryptase upon activation.

    Conclusions:

    • Human basophils are capable of producing IL-4 both in vivo and in vitro.
    • Leukemic basophils exhibit a higher degree of spontaneous IL-4 production compared to normal basophils.
    • These findings highlight the role of basophils as a source of IL-4 in certain hematological conditions.