Variants in the interleukin 8 gene and the response to inhaled bronchodilators in cystic fibrosis.

Abstract:

OBJECTIVE:Interleukin 8 protein promotes inflammatory responses, even in airways. The presence of interleukin 8 gene variants causes altered inflammatory responses and possibly varied responses to inhaled bronchodilators. Thus, this study analyzed the interleukin 8 variants (rs4073, rs2227306, and rs2227307) and their association with the response to inhaled bronchodilators in cystic fibrosis patients. METHODS:Analysis of interleukin 8 gene variants was performed by restriction fragment length polymorphism of polymerase chain reaction. The association between spirometry markers and the response to inhaled bronchodilators was evaluated by Mann-Whitney and Kruskal-Wallis tests. The analysis included all cystic fibrosis patients, and subsequently patients with two mutations in the cystic fibrosis transmembrane conductance regulator gene belonging to classes I to III. RESULTS:This study included 186 cystic fibrosis patients. There was no association of the rs2227307 variant with the response to inhaled bronchodilators. The rs2227306 variant was associated with FEF50% in the dominant group and in the group with two identified mutations in the cystic fibrosis transmembrane conductance regulator gene. The rs4073 variant was associated with spirometry markers in four genetic models: co-dominant (FEF25-75% and FEF75%), dominant (FEV1, FEF50%, FEF75%, and FEF25-75%), recessive (FEF75% and FEF25-75%), and over-dominant (FEV1/FVC). CONCLUSIONS:This study highlighted the importance of the rs4073 variant of the interleukin 8 gene, regarding response to inhaled bronchodilators, and of the assessment of mutations in the cystic fibrosis transmembrane conductance regulator gene.

journal_name

J Pediatr (Rio J)

journal_title

Jornal de pediatria

authors

Furlan LL,Ribeiro JD,Bertuzzo CS,Salomão Junior JB,Souza DRS,Marson FAL

doi

10.1016/j.jped.2017.03.005

subject

Has Abstract

pub_date

2017-01-01 00:00:00

pages

639-648

issue

6

eissn

0021-7557

issn

1678-4782

pii

S0021-7557(17)30634-4

journal_volume

93

pub_type

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