Associations of IL-2 and IL-4 Expression and Polymorphisms With the Risks of Mycoplasma pneumoniae Infection and Asthma in Children.

Abstract:

INTRODUCTION:Asthma is an inflammatory disorder of the airways and the symptoms of asthma could be exacerbated by Mycoplasma pneumoniae infection. Interleukin-2 and interleukin-4 have been implicated in immune and inflammatory reactions. We examined the associations of IL2 and IL4 polymorphisms and expression with the risks of asthma and M. pneumoniae infection in children. METHODS:392 asthmatic children and 849 controls were recruited into the study. Eight polymorphisms in IL2 and IL4 were genotyped with Sequenom MassARRAY platform. M. pneumoniae infection and copy number was determined with fluorescence PCR. IL-2 and IL-4 serum expression levels were determined by using ELISA. RESULTS:We found a significant association of IL2 rs6534349 polymorphism with increased asthma risk (heterozygotes, P=.029; homozygous variants; P=.013) and of IL4 rs2227284 polymorphism with reduced asthma risk (heterozygotes, P=.026; homozygous variants; P=.001). Besides, the association of other polymorphisms, except rs2070874 polymorphism, became apparent when the asthmatic children were grouped according to GINA classification of asthma control and severity. In addition, IL-2 and IL-4 serum expression levels were significantly higher in M. pneumoniae negative (P=.038) and positive (P=.011) subjects respectively. This observation holds true among asthmatic patients (P=.016 for IL-2 and P=.042 for IL-4), but only the IL-4 observation remained correct among non-asthmatic controls (P=.032). We also observed that the rs6534349 GG genotype was significantly associated with increased odds of getting high load M. pneumoniae infection (P=.0376). CONCLUSIONS:IL2 and IL4 could be important biomarkers for estimating the risks of asthma and M. pneumoniae infection in children.

journal_name

Arch Bronconeumol

authors

Wang RS,Jin HX,Shang SQ,Liu XY,Chen SJ,Jin ZB

doi

10.1016/j.arbres.2014.11.004

subject

Has Abstract

pub_date

2015-11-01 00:00:00

pages

571-8

issue

11

eissn

0300-2896

issn

1579-2129

pii

S0300-2896(14)00442-6

journal_volume

51

pub_type

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