Differential rates of apoptosis and recruitment limit eosinophil accumulation in the lungs of asthma-resistant CBA/Ca mice

Damon J. Tumes, Alex C H Wong, William A. Sewell, Shaun R. McColl, Ashley Connolly, Lindsay A. Dent

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The accumulation of eosinophils is a common feature of allergic airway inflammation and correlates with disease severity. In an ovalbumin (OVA)-induced murine model of allergic lung disease, CBA/Ca mice develop much lower levels of lung eosinophilia, lung oedema, mucus hypersecretion and airways obstruction than BALB/c and C57BL/6 strains. In this study these strains have been examined to identify mechanisms that control the recruitment and survival of eosinophils in the allergic lung. Following immunization with OVA, CBA/Ca mice developed a robust systemic allergic response, with high levels of total and OVA-specific IgE and increases in peripheral blood eosinophils. Lung eotaxin-1 levels and expression of CD18 on eosinophils recovered by bronchoalveolar lavage (BAL) were least pronounced in CBA/Ca mice, whereas mRNA for L-selectin was highest in eosinophils from C57BL/6 mice. Apoptosis of BAL eosinophils ex vivo was most pronounced in the CBA/Ca strain. BALB/c mice expressed the highest levels of the eosinophil growth and survival factor interleukin (IL)-5 in the lungs and BAL eosinophils from these animals expressed more of the anti-apoptotic proteins Bcl-xL and Bcl-2 than cells from the other strains. A combination of lower levels of recruitment and rapid apoptosis may therefore limit the accumulation of eosinophils and pathology in the lungs of CBA/Ca mice. In addition, although the level of pathology that developed in C57BL/6 and BALB/c mice was similar, some of the underlying mechanisms are likely to differ.

LanguageEnglish
Pages3609-3617
Number of pages9
JournalMolecular Immunology
Volume45
Issue number13
DOIs
Publication statusPublished - 1 Aug 2008

Keywords

  • Allergy
  • Asthma
  • Inflammation
  • Interleukin

ASJC Scopus subject areas

  • Immunology
  • Molecular Biology

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