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Mol Immunol. 2017 Feb;82:34-45. doi: 10.1016/j.molimm.2016.12.012. Epub 2016 Dec 21.

Biomarkers associated with disease severity in allergic and nonallergic asthma.

Author information

1
Immunology Department, IIS-Jiménez Díaz Foundation, UAM, Madrid, Spain; CIBERES, CIBER of Respiratory Diseases, Spain.
2
Immunology Department, IIS-Jiménez Díaz Foundation, UAM, Madrid, Spain.
3
CIBERES, CIBER of Respiratory Diseases, Spain; Allergy Department, Jiménez Díaz Foundation, Madrid, Spain.
4
Allergy Department, Vírgen del Rocío University Hospital, Seville, Spain.
5
Allergy Department, San Cecilio University Hospital, Granada, Spain.
6
Immunology Department, IIS-Jiménez Díaz Foundation, UAM, Madrid, Spain; CIBERES, CIBER of Respiratory Diseases, Spain. Electronic address: bcardaba@fjd.es.

Abstract

Asthma is a complex, chronic respiratory disease with a wide clinical spectrum. Use of high-throughput technologies has generated a great deal of data that require validation. In this work the objective was to validate molecular biomarkers related to asthmatic disease types in peripheral blood samples and define their relationship with disease severity. With this purpose, ninety-four previously described genes were analyzed by qRT-PCR in 30 healthy control (HC) subjects, 30 patients with nonallergic asthma (NA), 30 with allergic asthma (AA), and 14 patients with allergy (rhinitis) but without asthma (AR). RNA was extracted from peripheral blood mononuclear cells (PBMCs) using the TRIzol method. After data normalization, principal component analysis (PCA) was performed, and multiple approaches were used to test for differential gene expression. Relevance was defined by RQ (relative quantification) and corrected P value (<0.05). Protein levels of IL-8 and MSR1 were determined by ELISA and Western blot, respectively. PCA showed 4 gene expression clusters that correlated with the 4 clinical phenotypes. Analysis of differential gene expression between clinical groups and HCs revealed 26 statistically relevant genes in NA and 69 in AA. Protein interaction analysis revealed IL-8 to be a central protein. Average levels of IL-8 were higher in the asthma patients' sera (NA: 452.28±357.72, AA: 327.46±377pg/ml) than in HCs (286.09±179.10), but without reaching statistical significance. Nine genes, especially MSR1, were strongly associated with severe NA. In conclusion, several molecular biomarkers of asthma have been defined, some of which could be useful for the diagnosis or prognosis of disease severity.

KEYWORDS:

Allergy; Asthma; Biomarkers; Gene expression; Severity

PMID:
28011367
DOI:
10.1016/j.molimm.2016.12.012
[Indexed for MEDLINE]

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