Comparison of effects of anti-IL-3, IL-5 and GM-CSF treatments on eosinophilopoiesis and airway eosinophilia induced by allergen

Masafumi Tomaki, Lin Ling Zhao, Margareta Sjöstrand, Anders Lindén, Masakazu Ichinose, Jan Lötvall

Research output: Contribution to journalReview articlepeer-review

14 Citations (Scopus)


Allergic inflammation is dominated by eosinophils. IL-3, IL-5, and GM-CSF are involved in production and activation of eosinophils. IL-5 has been reported to be crucial for the induction of airway eosinophilia. However, the contribution of IL-3 and GM-CSF to allergic airway inflammation remains to be determined. To address this issue, ovalbumin-sensitized Balb/c mice were repeatedly exposed to allergen via airway route. Animals were pretreated intraperitoneally with neutralising anti-IL-3, anti-IL-5 and/or anti-GM-CSF antibodies. Newly produced inflammatory cells were pulse-labelled with the thymidine analogue 5-bromo-2′-deoxyuridine (BrdU), which is incorporated into DNA during the cell mitosis. BAL and bone marrow cells were collected 24 h after the last allergen exposure, and differential cell counts and immunocytochemical detection of BrdU-labelled cells were performed. Anti-IL-5 strongly reduced both BAL and bone marrow eosinophilia, as well as the number of BrdU-positive BAL-granulocytes. In contrast, anti-IL-3 and anti-GM-CSF alone had little and no inhibitory effect on these responses, respectively. Even the combined treatment with anti-IL-3 and anti-GM-CSF showed only a non-significant tendency to attenuate these responses. These data suggest that the efficacy of treatments with anti-IL-3 and anti-GM-CSF is much weaker than that with anti-IL-5. IL-5 may be the preferred target to block eosinophilia in allergic diseases.

Original languageEnglish
Pages (from-to)161-168
Number of pages8
JournalPulmonary Pharmacology and Therapeutics
Issue number2
Publication statusPublished - 2002 Jan 1


  • Asthma
  • Eosinophil
  • GM-CSF
  • IL-3
  • IL-5

ASJC Scopus subject areas

  • Pulmonary and Respiratory Medicine
  • Biochemistry, medical
  • Pharmacology (medical)


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