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. 2012 Dec;67(12):1061-6.
doi: 10.1136/thoraxjnl-2012-201634. Epub 2012 Sep 26.

Epithelial eotaxin-2 and eotaxin-3 Expression: Relation to Asthma Severity, Luminal Eosinophilia and Age at Onset

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Free PMC article

Epithelial eotaxin-2 and eotaxin-3 Expression: Relation to Asthma Severity, Luminal Eosinophilia and Age at Onset

John M Coleman et al. Thorax. .
Free PMC article

Abstract

Background: Eosinophilic inflammation is implicated in asthma. Eotaxin 1-3 regulate eosinophil trafficking into the airways along with other chemotactic factors. However, the epithelial and bronchoalveolar lavage (BAL) cell expression of these chemokines in relation to asthma severity and eosinophilic phenotypes has not been addressed.

Objective: To measure the expression of the three eotaxin isoforms in bronchoscopically obtained samples and compare them with clinically relevant parameters between normal subjects and patients with asthma.

Methods: Normal subjects and patients with asthma of varying severity recruited through the Severe Asthma Research Program underwent clinical assessment and bronchoscopy with airway brushing and BAL. Eotaxin 1-3 mRNA/protein were measured in epithelial and BAL cells and compared with asthma severity, control and eosinophilic inflammation.

Results: Eotaxin-2 and eotaxin-3 mRNA and eotaxin-2 protein were increased in airway epithelial brushings from patients with asthma and were highest in cases of severe asthma (p values 0.0155, 0.0033 and 0.0006, respectively), with eotaxin-2 protein increased with age at onset. BAL cells normally expressed high levels of eotaxin-2 mRNA/protein but BAL fluid levels of eotaxin-2 were lowest in severe asthma. Epithelial eotaxin-2 and eotaxin-3 mRNA/protein was associated with sputum eosinophilia, lower forced expiratory volume in 1 s and more asthma exacerbations. Airway epithelial cell eotaxin-2 protein differed by asthma severity only in those with late onset disease, and tended to be highest in those with late onset eosinophilic asthma.

Conclusions: Epithelial eotaxin-2 and 3 are increased in asthma and severe asthma. Their expression may contribute to luminal migration of eosinophils, especially in later onset disease, asthma control and severity.

Figures

Figure 1
Figure 1
(A) Eotaxin-2 mRNA expression in cells obtained by epithelial brushings from patients with asthma and normal controls. (bB) Eotaxin-2 protein levels among the subject groups. Data represent the values of the median, 25th and 75th percentiles with maximum/minimum whiskers. GAPDH, glyceraldehyde 3-phosphate dehydrogenase; ICS inhaled corticosteroid.
Figure 2
Figure 2
Eotaxin-3 mRNA levels in cells obtained by epithelial brushings from patients with asthma and normal controls (NCs). Data represent the values of the median, 25th and 75th percentiles with maximum/minimum whiskers. GAPDH, glyceraldehyde 3-phosphate dehydrogenase; ICS inhaled corticosteroid.
Figure 3
Figure 3
Bronchoalveolar lavage fluid eotaxin-2 levels from patients with asthma and normal controls. Data represent medians with 25th–75th percentiles and maximum/minimum whiskers. BALF, bronchoalveolar lavage fluid; ICS inhaled corticosteroid.

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