Asthma Origins and Remission Study (ARMS)
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|ClinicalTrials.gov Identifier: NCT03141814|
Recruitment Status : Recruiting
First Posted : May 5, 2017
Last Update Posted : July 17, 2017
Asthma is characterized by chronic airway inflammation of the large and small airways. Asthma patients often have episodes with symptoms of dyspnea, wheezing and nocturnal awakening. Currently available inhaled anti-inflammatory treatments reduce the airway inflammation and treatment but do not cure the disease. Therefore asthma patients often need life-long treatment to control their asthma.
In a small subset of patients, their asthma resolves spontaneously. This phenomenon is called asthma remission. Subjects with asthma remission do not experience symptoms or signs of airway inflammation anymore and do not require inhaled treatments. Some subjects with asthma remission also have a completely normal lung function without signs of bronchial hyperresponsivess: they have complete asthma remission. Unfortunately, asthma remission occurs only in a small subset of 15-25% of asthma patients.Objective: to determine the underlying mechanisms and molecular events leading to remission of asthma.
|Condition or disease|
Rationale: Asthma inception occurs only in susceptible individuals, and is often triggered by specific environmental factors, such as respiratory viruses and aeroallergens. Although asthma is generally viewed as a chronic persistent disease, remission of asthma is possible in a subset of patients. This is highly relevant, since understanding mechanisms that contribute to asthma inception and remission may teach us how asthma can be stopped and thus may provide novel avenues for the treatment of asthma. In adulthood, average remission rates of asthma are approximate 2% per year 1. We observed that remission in adulthood is more likely with earlier onset of asthma, less airway obstruction, more severe bronchial hyperresponsiveness, and smoking cessation. A proper definition of remission is very important; we therefore introduced the terms 'clinical remission' and 'complete remission' 2. Clinical remission was defined as the absence of asthma symptoms and no use of asthma medication, complete remission as the absence of asthma symptoms, no use of asthma medication, normal lung function and no bronchial hyperresponsiveness. In a longitudinal study of 119 allergic asthmatic children followed-up for 30 years, our group found that clinical remission occurred in 30% and complete remission in 22% of all cases.
Objective: to determine the underlying mechanisms and molecular events involved in the inception and remission of asthma.
Methods: We will include a 40 subjects divided over the following 4 groups: i) clinical asthma remission (10 subjects), ii) complete asthma remission (10 subjects), iii) ongoing asthma (10 patients), iv) non-asthmatic healthy controls (10 subjects) in a cross-sectional study. All subjects will be extensively clinically characterized including respiratory symptoms/questionnaires, in- and expiratory CT-scans, and parameters of large and small airway function and inflammation. In addition, blood and nasal epithelial brushes will be obtained to study the genetic and epigenetic mechanisms of asthma remission. Finally, bronchoscopy with bronchial biopsies and brushes will be performed under conscious sedation. Bronchial biopsies from all four patient groups will be used for index FACS sorting of the three most important cell types orchestrating the asthmatic inflammatory process: i.e. B lymphocytes, CD4+ T cells and CD8+ T cells. We will perform single cell whole-genome transcriptome sequencing on at least 100 cells of each type and the primary outcome of the study is to identify how the transcriptomic profile of bronchial epithelial cells is changed between asthma patients and healthy controls as a consequence of asthma inception and what transcriptomic profile changes occur in CD4+ CD8+ and B lymphocytes in the airways from subjects with asthma remission compared to patients with ongoing asthma and healthy controls.
|Study Type :||Observational|
|Estimated Enrollment :||80 participants|
|Official Title:||A Better Understanding of Molecular Mechanisms Leading to Asthma and Its Remission|
|Study Start Date :||October 2015|
|Estimated Primary Completion Date :||October 2018|
|Estimated Study Completion Date :||October 2018|
20 patients with ongoing ashma
complete asthma remission
20 subjects with complete asthma remission
clinical asthma remission
20 subjects with clinical asthma remission
non-asthmatic healthy controls
20 subjects without respiratory symptoms and normal lung function and no bronchial hyperresponsiveness to methacholine and/or AMP
- Single cell sequencing data [ Time Frame: baseline ]Single cell mRNA sequencing of lymphocytes in bronchial biopsies and blood eosinophils
- Spirometry [ Time Frame: baseline ]FEV1, FVC, FEV1/FVC, FEF25-75.
- body box [ Time Frame: baseline ]RV, RV/TLC, FRC, IC, ERV
- HRCT [ Time Frame: baseline ]emphysema and small airways disease
- Airway inflammation [ Time Frame: baseline ]Sputum, blood, biopsy inflammatory cell counts, exhaled nitric oxide, small particles in exhaled breath
- Small airways disease [ Time Frame: baseline ]Multiple breath nitrogen washout: LCI, Sacin, Scond
- genetic and genome-wide mRNA, non-coding RNA, and DNA methylation [ Time Frame: baseline ]assessed in bronchial and nasal epithelial brushes, biopsies and blood
Biospecimen Retention: Samples With DNA
To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT03141814
|Contact: Maarten van den Berge, MD, PhDfirstname.lastname@example.org|
|Contact: Martijn Nawijn, PhDemail@example.com|
|Groningen, Netherlands, 9713|
|Contact: Huib AM Kerstjens, prof. dr. +31 50 3610280 firstname.lastname@example.org|
|Principal Investigator:||Maarten van den Berge, MD PhD||University Medical Center Groningen|