Inhibition of spleen tyrosine kinase prevents mast cell activation and airway hyperresponsiveness

Shigeki Matsubara, Guiming Li, Katsuyuki Takeda, Joan E. Loader, Polly Pine, Esteban S. Masuda, Nobuaki Miyahara, Satoko Miyahara, Joseph J. Lucas, Azzeddine Dakhama, Erwin W. Gelfand

Research output: Contribution to journalArticle

81 Scopus citations

Abstract

Rationale: Spleen tyrosine kinase (Syk) is important for Fc and B-cell receptor-mediated signaling. Objective: To determine the activity of a specific Syk inhibitor (R406) on mast cell activation in vitro and on the development of allergen-induced airway hyperresponsiveness (AHR) and inflammation in vivo. Methods: AHR and inflammation were induced after 10 d of allergen (ovalbumin [OVA]) exposure exclusively via the airways and in the absence of adjuvant. This approach was previously established to be IgE, FcεRI, and mast cell dependent. Alternatively, mice were passively sensitized with OVA-specific IgE, followed by limited airway challenge. In vitro, the inhibitor was added to cultures of IgE-sensitized bone marrow-derived mast cells (BMMCs) before cross-linking with allergen. Results: The inhibitor prevented OVA-induced degranulation of passively IgE-sensitized murine BMMCs and inhibited the production of interleukin (IL)-13, tumor necrosis factor α, IL-2, and IL-6 in these sensitized BMMCs. When administered in vivo, R406 inhibited AHR, which developed in BALB/c mice exposed to aerosolized 1% OVA for 10 consecutive d (20 min/d), as well as pulmonary eosinophilia and goblet cell metaplasia. A similar inhibition of AHR was demonstrated in mice passively sensitized with OVA-specific IgE and exposed to limited airway challenge. Conclusion: This study delineates a functional role for Syk in the development of mast cell- and IgE-mediated AHR and airway inflammation, and these results indicate that inhibition of Syk may be a target in the treatment of allergic asthma.

Original languageEnglish (US)
Pages (from-to)56-63
Number of pages8
JournalAmerican Journal of Respiratory and Critical Care Medicine
Volume173
Issue number1
DOIs
StatePublished - Jan 1 2006

Keywords

  • Airway hyperresponsiveness
  • Eosinophils
  • Goblet cell metaplasia
  • Mast cells
  • Spleen tyrosine kinase

ASJC Scopus subject areas

  • Pulmonary and Respiratory Medicine
  • Critical Care and Intensive Care Medicine

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    Matsubara, S., Li, G., Takeda, K., Loader, J. E., Pine, P., Masuda, E. S., Miyahara, N., Miyahara, S., Lucas, J. J., Dakhama, A., & Gelfand, E. W. (2006). Inhibition of spleen tyrosine kinase prevents mast cell activation and airway hyperresponsiveness. American Journal of Respiratory and Critical Care Medicine, 173(1), 56-63. https://doi.org/10.1164/rccm.200503-361OC