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Ōsaka, Japan

Harada M.,Institute of Physical and Chemical Research | Hirota T.,Institute of Physical and Chemical Research | Jodo A.I.,Institute of Physical and Chemical Research | Hitomi Y.,Institute of Physical and Chemical Research | And 29 more authors.
American Journal of Respiratory Cell and Molecular Biology | Year: 2011

Thymic stromal lymphopoietin (TSLP) triggers dendritic cell - mediated T helper (Th) 2 inflammatory responses. A single-nucleotide polymorphism (SNP), rs3806933, in the promoter region of the TSLP gene creates a binding site for the transcription factor activating protein (AP) - 1. The variant enhances AP-1 binding to the regulatory element, and increases the promoter - reporter activity of TSLP in response to polyinosinic-polycytidylic acid (poly[I:C]) stimulation in normal human bronchial epithelium (NHBE). We investigated whether polymorphisms including the SNP rs3806933 could affect the susceptibility to and clinical phenotypes of bronchial asthma. We selected three representative (i.e., Tag) SNPs and conducted association studies of the TSLP gene, using two independent populations (639 patientswith childhood atopic asthma and 838 control subjects, and 641 patients with adult asthma and 376 control subjects, respectively).We further examined the effects of corticosteroids and a long-acting β2-agonist (salmeterol) on the expression levels of the TSLP gene in response to poly(I:C) in NHBE. We found that the promoter polymorphisms rs3806933 and rs2289276 were significantly associated with disease susceptibility in both childhood atopic and adult asthma. The functional SNP rs3806933 was associated with asthma (meta-analysis, P = 0.000056; odds ratio, 1.29; 95% confidence interval, 1.14-1.47). A genotype of rs2289278 was correlated with pulmonary function. Moreover, the induction of TSLP mRNA and protein expression induced by poly(I:C) in NHBE was synergistically impaired by a corticosteroid and salmeterol. TSLP variants are significantly associated with bronchial asthma and pulmonary function. Thus, TSLP may serve as a therapeutic target molecule for combination therapy.

Shimoda T.,Clinical Research Center | Obase Y.,Kawasaki Medical School | Kishikawa R.,Clinical Research Center | Iwanaga T.,Clinical Research Center | And 2 more authors.
Allergology International | Year: 2013

Background: Fractional exhaled nitric oxide (FeNO) is known to be a good marker of airway eosinophilic inflammation in bronchial asthma. Recently, serum high sensitivity C-reactive protein (hs-CRP) has been shown to be also useful to detect the airway inflammation. Methods: Newly diagnosed 90 cough variant asthma and 92 bronchial asthma patients were enrolled. FeNO, serum hs-CRP, pulmonary function tests, bronchial hyperresponsiveness, IgE and sputum eosinophils ratio were compared. Ninety healthy control subjects were set for FeNO and serum hs-CRP normal range reference. We have compared the clinical utilities of FeNO and serum hs-CRP to differentiate bronchial asthma and cough variant asthma. Results: FeNO was significantly higher in bronchial asthma (92.6 ± 85.5 ppb) than in cough variant asthma (35.6 ± 43.3; p < 0.001) and both were significantly higher than normal range (18.0 ± 6.4, p < 0.001, respectively), and in differentiating between the two groups showed a sensitivity of 0.69 and a specificity of 0.73 at the cutoff value of 28 ppb. Serum hs-CRP did not differ significantly between bronchial asthma (723 ± 1162 ng ml) and cough variant asthma (558 ± 758) even if both were significantly higher than normal range (345 ± 401, p < 0.01 and p < 0.05 respectively). Conclusions: FeNO is more useful than serum hs-CRP in differentiating patients with bronchial asthma from those with cough variant asthma, and healthy persons. © 2013 Japanese Society of Allergology.

Otsuki M.,Osaka University | Miyatake A.,Miyatake Asthma Clinic | Fujita K.,University of Shiga Prefecture | Hamasaki T.,Osaka University | Kasayama S.,Osaka University
European Respiratory Journal | Year: 2010

Although inflammation is an important component of atherosclerosis, it is unknown whether inhaled corticosteroids (ICS) as anti-inflammatory drugs prevent atherosclerosis. In the present study, carotid atherosclerosis was evaluated by ultrasonography in 150 asthmatic patients who had been regularly treated with ICS, and in 150 matched nonasthmatic controls, with an assessment of atherosclerotic risk factors. Carotid intima-media thickness was significantly lower in the asthmatic patients than in the controls. The prevalence of carotid plaque tended to be lower in the asthmatic patients than in the controls. Defined carotid atherosclerosis was diagnosed in 51 of the asthmatic patients, who were older, with a higher prevalence of males, a higher prevalence of dyslipidaemia and a lower mean daily dose of ICS than the 99 patients without carotid atherosclerosis. Stepwise multiple logistic regression analysis identified age, male sex and dyslipidaemia as positive risk factors for carotid atherosclerosis. The mean daily dose of ICS was a negative risk factor. Carotid atherosclerosis is reduced in asthmatic patients treated with ICS compared with matched controls. This study suggests that ICS may have protective effects against atherosclerosis. Copyright©ERS 2010.

Undarmaa S.,Chiba University | Mashimo Y.,Chiba University | Hattori S.,Chiba University | Shimojo N.,University of Shiga Prefecture | And 9 more authors.
Journal of Human Genetics | Year: 2010

In asthma genetics, the association of highly replicated susceptibility genes lacks consistency across populations. To identify genuine associations, we investigated the reproducibility of the 23 most promising asthma and asthma-related candidate genes in a moderately sized sample from the Japanese population. We compared the frequency of 33 polymorphisms in unrelated cases and controls and tested for their association with asthma, atopy and serum total IgE levels using allele frequency, codominant, dominant and recessive genotype models. On the basis of the consistency of our findings with previous meta-analyses and large replication studies, IL13, TNF, ADAM33, IL4RA and TBXA2R might represent common major asthma and asthma-related trait genes. Individual gene assessment was extended to the interactions between two polymorphisms using our original method. Interactions between TBXA2R and ADAM33, and IL4RA and C3 were suggested to increase the risk for childhood and all asthma (adult and childhood asthma combined). The confirmation of previously reported associations between gene polymorphisms and phenotypes was problematic when as few as several hundred samples per group were used. Stratification of the subjects by environmental factors or other confounding factors may be necessary to improve the sensitivity and reliability of association results. © 2010 The Japan Society of Human Genetics All rights reserved.

Chang W.-C.,Kaohsiung Medical University | Lee C.-H.,Kaohsiung Medical University | Hirota T.,RIKEN | Wang L.-F.,National Taiwan University | And 20 more authors.
PLoS ONE | Year: 2012

Atopic dermatitis is a chronic inflammatory skin disease. Multiple genetic and environmental factors are thought to be responsible for susceptibility to AD. In this study, we collected 2,478 DNA samples including 209 AD patients and 729 control subjects from Taiwanese population and 513 AD patients and 1027 control subject from Japanese population for sequencing and genotyping ORAI1. A total of 14 genetic variants including 3 novel single-nucleotide polymorphisms (SNPs) in the ORAI1 gene were identified. Our results indicated that a non-synonymous SNP (rs3741596, Ser218Gly) associated with the susceptibility of AD in the Japanese population but not in the Taiwanese population. However, there is another SNP of ORAI1 (rs3741595) associated with the risk of AD in the Taiwanese population but not in the Japanese population. Taken together, our results indicated that genetic polymorphisms of ORAI1 are very likely to be involved in the susceptibility of AD. © 2012 Chang et al.

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