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Increased sputum and bronchial biopsy IL-13 expression in severe asthma.

Authors: Saha, SK  Berry, MA  Parker, D  Siddiqui, S  Morgan, A  May, R  Monk, P  Bradding, P  Wardlaw, AJ  Pavord, ID  Brightling, CE 
Citation: Saha SK, etal., J Allergy Clin Immunol. 2008 Mar;121(3):685-91.
Pubmed: (View Article at PubMed) PMID:18328894
DOI: Full-text: DOI:10.1016/j.jaci.2008.01.005

BACKGROUND: The importance of IL-13 in the asthma paradigm is supported by increased expression in human subjects, particularly in patients with mild-to-moderate asthma. However, the role of IL-13 in severe asthma needs to be further defined. OBJECTIVE: We sought to assess IL-13 expression in sputum and bronchial biopsy specimens from subjects with mild-to-severe asthma. METHODS: Sputum IL-13 concentrations were measured in 32 control subjects, 34 subjects with mild asthma, 21 subjects with moderate asthma, and 26 subjects with severe asthma. Enumeration of mast cells, eosinophils, and IL-13+ cells in the bronchial submucosa and airway smooth muscle (ASM) bundle was performed in 7 control subjects, 14 subjects with mild asthma, 7 subjects with moderate asthma, and 7 subjects with severe asthma. RESULTS: The proportion of subjects with measurable IL-13 in the sputum was increased in the mild asthma group (15/34) and severe asthma group (10/26) compared with that seen in the control group (4/32; P = .004). IL-13+ cells were increased within the submucosa in all asthma severity groups compared with control subjects (P = .006). The number of IL-13+ cells were increased within the ASM bundle in the severe asthma group compared with that seen in the other groups (P < .05). Asthma control questionnaire scores positively correlated with sputum IL-13 concentrations (R(s) = 0.35, P = .04) and mast cells in the ASM bundle (R(s) = 0.7, P = .007). IL-13+ cells within the submucosa and ASM correlated with sputum eosinophilia (R(s) = 0.4, P < or = .05). CONCLUSIONS: IL-13 overexpression in sputum and bronchial biopsy specimens is a feature of severe asthma.

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CRRD Object Information
CRRD ID: 4145777
Created: 2010-11-15
Species: All species
Last Modified: 2010-11-15
Status: ACTIVE



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RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.