The effect of CD14 and TLR4 gene polimorphisms on asthma phenotypes in adult Turkish asthma patients: a genetic study

BMC Pulmonary Medicine

Kenan Midilli²  Nilgün Karaca³  Mert Ahmet Kuskucu²  Ayşegül Kuskucu¹  Pınar Yıldız⁴  Füsun Şahin⁴ 

[1] Department of Medical Genetics, Yeditepe University School of Medicine, İstanbul, Turkey;Department of Medical Microbiology, Cerrahpaşa School of Medicine, İstanbul University, İstanbul, Turkey;Department of Biotechnology, Yeditepe Univesity Institute of Science, İstanbul, Turkey;Department of Chest Diseases, Yedikule Chest Diseases and Surgery Training and Research Hospital, Zeytinburnu/İstanbul, 34760, Turkey

关键词: Eosinophil;    Total IgE;    TLR4;    CD14;    Gen polymorphism;    Atopy;    Asthma;   

Others  :  865429
DOI  :  10.1186/1471-2466-14-20

 received in 2013-06-25, accepted in 2014-02-03,  发布年份 2014

【 摘 要 】

Background

Endotoxins stimulate T helper 1 cell maturation and send a negative signal to T helper 2 polarisation. This causes a decrease IgE levels and prevents atopy (Hygiene hypothesis). It is shown that this response is under genetic control by polymorphisms in CD14 and TLR4 genes in some researchs. We aimed to investigate the effects of genetic variants of CD14 (−) and TLR4 (Asp299Gly, Thr399Ile) genes on asthma phenotypes in adults with asthma.

Methods

Asthma patients (n = 131) and healthy control cases (n = 75) were included in the study. Relations between CD14 C-159 T, TLR4 299 and TLR4 399 genotypes and duration of asthma history of allergic rhinitis-dermatitis, total IgE, eosinophil, skin prick test, forced expiratory volume 1 (FEV1) and severity of disease were evaluated. Real time PCR (RT-PCR) was used for genotyping.

Results

For CD14-159, presence of the C allele (CC + CT) was more frequent among those with low median log (logarithm) IgE levels, but no statistically significant difference in all asthma group (p = 0.09). C allele was significantly correlated with low total IgE levels and T allele with high total IgE levels in atopics (p = 0.04). CC + CT genotype was more frequent in moderate and severe asthma group in atopics (p = 0.049). TLR4 299 and TLR4 399 genotypes and asthma phenotypes were not found to be significantly correlated (p > 0.05).

Conclusions

Total IgE levels were found to be low among patients with the CC + CT genotype, and high among patients with the TT genotype contrary to the results of many other studies, which is therefore an important finding. Another important finding was that the C allele is a risk factor for moderate and severe asthma.

【 授权许可】

   
2014 Şahin et al.; licensee BioMed Central Ltd.

【 图 表 】

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