Interleukin-2 activates human peripheral blood eosinophils

Ronit Hoenstein*, Dan Admon, Abraham Solomon, Alan Norris, Redwan Moqbel, Francesca Levi-Schaffer

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


The effect of interleukin (IL)-2 on eosinophil survival and mediator release was investigated in vitro. Human peripheral blood eosinophils were isolated and purified from mildly atopic donors and cultured on albumin-coated wells with different concentrations of IL-2, interferon (IFN)-γ, and granulocyte,macroph age colony stimulating factor (GM-CSF) and their viability was evaluated after 4 days in culture. Eosinophils were cultured with IL-2 (1000 u/mi), IFN-γ (1000 u/ml), or GM-CSF (10 ng/ml) for 18 h, or with platelet activating factor (PAF) (10-6 M) for 20 min, and the release of eosinophil peroxidase (EPO) and IL-6 was measured. Nedocromil sodium (10-5 M) was added with each of the above cytokines to study the inhibitory effect of this drug on EPO release. A significant increase of EPO release was induced by IL-2, IFN-γ, and GM-CSF after 18 h in culture. IL-2 as well as IFN-γ induced a significant IL-6 release from eosinophils. Nedocromil sodium significantly inhibited EPO release from eosinophils induced by IL-2 or PAF. These results show that IL-2 can activate peripheral blood eosinophils to release granule mediators (EPO) and cytokines (IL-6). Taken together with the presence of IL-2 receptors on eosinophils, we conclude that IL-2 is an important mediator in allergic inflammation and a possible target for pharmacological modulation. 2001, Academic Press.

Original languageAmerican English
Pages (from-to)116-124
Number of pages9
JournalCellular Immunology
Issue number2
StatePublished - 15 Jun 2001

Bibliographical note

Funding Information:
1 This work was partially supported by a grant from Ronc Poulenc Rorer Pharmaceuticals to F. Levi-Schaffer.


  • Eosinophil peroxidase
  • Eosinophils
  • Interleukin-2
  • Interleukin-6
  • Nedocromil sodium
  • Platelet activating factor


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