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Identification of alpha-enolase as an autoantigen associated with severe asthma.

Authors
Nahm, DH; Lee, KH; Shin, JY; Ye, YM; Kang, Y; Park, HS
Citation
The Journal of allergy and clinical immunology, 118(2):376-381, 2006
Journal Title
The Journal of allergy and clinical immunology
ISSN
0091-67491097-6825
Abstract
BACKGROUND: Approximately 5% to 10% of patients with asthma have severe disease that is not effectively controlled by typical therapies. The existence of an autoantigen associated with severe asthma has been previously reported.



OBJECTIVE: We attempted to identify the autoantigen.



METHODS: Severe asthma was defined as patients having at least 1 severe asthmatic exacerbation requiring an emergency department visit or admission in the last year despite continuous typical therapies. Autoantibodies to airway epithelial cells (A549) were examined in sera from patients with severe asthma by immunoblot analysis.



RESULTS: IgG autoantibodies to the 52-kd airway epithelial cell antigen were detected in sera from 32 of 78 patients with severe asthma (41%), 9 of 83 patients with mild-to-moderate asthma (11%), and 2 of 58 healthy controls (3%; P < .001). The 52-kd autoantigen was identified as alpha-enolase by mass spectrometry analysis and confirmed by using recombinant human alpha-enolase protein. The detection of IgG autoantibodies to alpha-enolase was the most significant indicator for distinguishing severe asthma from mild-to-moderate asthma, even after adjusting for the effects of other clinical variables, including age, sex, atopy, and FEV(1) (adjusted odds ratio, 5.2; 95% CI, 2.1-12.9; P < .001).



CONCLUSION: The alpha-enolase was identified as an autoantigen associated with severe asthma. Further studies are needed to determine the significance of this autoantigen in severe asthma.



CLINICAL IMPLICATIONS: IgG autoantibodies to alpha-enolase could be a biological marker for severe asthma.
MeSH terms
AdultAsthma/immunology*Autoantibodies/bloodAutoantibodies/immunologyAutoantigens/immunology*Biological Markers/bloodCell LineEpithelial Cells/immunologyFemaleHumansImmunoglobulin G/bloodImmunoglobulin G/immunology*MalePhosphopyruvate Hydratase/immunology*Respiratory Mucosa/immunology
DOI
10.1016/j.jaci.2006.04.002
PMID
16890761
Appears in Collections:
Journal Papers > School of Medicine / Graduate School of Medicine > Allergy
Journal Papers > School of Medicine / Graduate School of Medicine > Physiology
AJOU Authors
남, 동호예, 영민강, 엽박, 해심
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