Reversal of airway inflammation and remodeling in asthma by a bispecific antibody fragment linking CCR3 to CD300a

Ariel Munitz, Ido Bachelet, Francesca Levi-Schaffer*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

85 Scopus citations


Background: Mast cells (MCs) and eosinophils are critically involved in asthma-associated airway damage and remodeling. However, molecular pathways that inhibit their functions in this process have been scarcely characterized. Recently we established that cross-linking of CD300a inhibits MC and eosinophil activation. Objective: To inhibit effector cell functions in a chronic model of experimental asthma by coaggregation of CD300a with CC chemokine receptor 3 (CCR3) using a bispecific antibody fragment (LC1). Methods: Mast cells and eosinophils were treated with LC1 before their activation. Mediator release, survival, and intracellular signaling were assessed. Furthermore, chronic experimental asthma was induced, and starting on day 30, the mice were challenged (3 challenges/wk) for an additional 38 days. With each challenge, the mice received LC1 intranasally. Results: LC1 inhibited MCs and eosinophil activation in vitro and in vivo. Mice that displayed airway inflammation on day 28 and were treated with LC1 completely recovered from the disease process. In the bronchoalveolar lavage fluid of these mice, cellular inflammation cytokine expression was comparable to that of saline-treated mice. Bronchoalveolar lavage fluid levels of TGF-β1 correlated significantly with reduced eosinophilia. Histologic analysis revealed significant reduction in lung inflammation, mucus production, collagen deposition, and peribronchial smooth-muscle thickening. Conclusion: CD300a is a critical modulator of MCs and eosinophil functions in allergic settings. Clinical implications: Specific targeting of CD300a in CCR3 + cells may be a potent tool for treating airway inflammation and tissue remodeling in asthma.

Original languageAmerican English
Pages (from-to)1082-1089
Number of pages8
JournalJournal of Allergy and Clinical Immunology
Issue number5
StatePublished - Nov 2006
Externally publishedYes

Bibliographical note

Funding Information:
Disclosure of potential conflict of interest: F. Levi-Schaffer has received grant support from Yissum Ltd and the Israeli Ministry of Industry and Commerce. The rest of the authors have declared that they have no conflict of interest.

Funding Information:
Supported by grants from Yissum and the Israeli Ministry of Industry and Commerce. Dr Levi-Schaffer is affiliated with the David R. Bloom Center of Pharmacy at the Hebrew University of Jerusalem.


  • Asthma
  • CD300a
  • airway remodeling
  • bispecific antibody
  • eosinophils


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