Expression profiling of genes related to asthma exacerbations
Article first published online: 22 JAN 2009
© 2009 Blackwell Publishing Ltd
Clinical & Experimental Allergy
Volume 39, Issue 2, pages 213–221, February 2009
How to Cite
Aoki, T., Matsumoto, Y., Hirata, K., Ochiai, K., Okada, M., Ichikawa, K., Shibasaki, M., Arinami, T., Sumazaki, R. and Noguchi, E. (2009), Expression profiling of genes related to asthma exacerbations. Clinical & Experimental Allergy, 39: 213–221. doi: 10.1111/j.1365-2222.2008.03186.x
- Issue published online: 22 JAN 2009
- Article first published online: 22 JAN 2009
- Submitted 25 July 2007; revised 31 October 2008; accepted 3 November 2008
- asthma exacerbation;
- gene ontology;
- respiratory infection
Background Asthma is a chronic airway inflammatory disease; however, the molecular mechanisms that underlie asthma exacerbation are only partially understood.
Objective To identify gene expression signatures that reflect the acute exacerbation of asthma, we examined the differential expression of genes during asthma exacerbation and stable condition by using microarray analysis.
Methods The subjects were mite-sensitive asthmatic children and non-asthmatic control children. The children were divided into four groups (AE: asthma exacerbation, n=12; SA: stable asthma, n=11; IC: infected control, n=6; and NC: non-infected control, n=5). Total RNA was extracted from peripheral blood mononuclear cells and subjected to microarray analysis with Illumina Human Ref8 BeadChip arrays. Welch's t-test was performed to identify genes whose expression was altered during asthma exacerbation. Quantitative real-time RT-PCR was performed on samples collected from 43 asthmatic children and 11 control children to verify the microarray results.
Results The expression of 137/16 genes was significantly up/down-regulated during asthma exacerbation assessed by microarray analysis. Of the genes, 62 were also differentially expressed during upper respiratory infection. Many of the asthma exacerbation related genes were involved in defence responses and responses to external stimuli, but these associations disappeared after excluding the infection-related genes. Quantitative real-time RT-PCR confirmed that the genes related (S100A8 and GAS6) and unrelated to infections (CD200 and RBP7) were differentially expressed during asthma exacerbation (P<0.01).
Conclusions Previously unidentified immune responses during asthma exacerbation may provide further clarification of the molecular mechanisms underlying asthma.