Implications and Stability of Clinical and Molecular Phenotypes of Severe Asthma

Sally E. Wenzel MD715 enrolled

Overview

The Severe Asthma Research Program III is an NIH cooperative agreement involving 7 clinical centers that encompass a multidisciplinary partnerships between asthma clinician-scientists and scientists with expertise in immunology, pulmonary physiology, molecular genetics, molecular phenotyping, imaging, and bioinformatics. These clinical centers will jointly recruit volunteers with asthma for an observational longitudinal follow-up study. However, centers will also conduct specific mechanistic research projects at each participating institution. The University of Pittsburgh's SARP III study will determine the molecular and clinical stability of asthma phenotypes over time.

The longitudinal follow-up study is divided into a characterization and longitudinal phase. During the characterization subjects will undergo a baseline evaluation that will include will include answering questionnaires, lung function testing, and chest tomography. Subsequently, to determine steroid responsiveness, all subjects will receive one intramuscular dose of 40 mg in 1ml (1 mg/kg for children \<18 years old, up to 40 mg maximum. Participants at the University of Pittsburgh will undergo a bronchoscopy to provide airway samples. The longitudinal phase will include a 36 month follow-up time with annual visits and phone calls every 6 months. During it, participants will answer questionnaires and provide sputum samples on two occasions, and will perform lung function testing. The SARP III longitudinal follow up study (all centers) will determine the long term stability and implications of clinical and molecular asthma phenotypes and identify potential systemic biomarkers for these phenotypes The University of Pittsburgh center will test the hypothesis that a) a mast cell signature is present and longitudinally maintained in severe asthma; and b) That the persistent signature determines short and long term outcomes through interactions with lung and inflammatory cells.

Study Type

OBSERVATIONAL

Enrollment

715

Conditions

Asthma

Eligibility

Sex: ALLMin age: 6 YearsHealthy volunteers:

Medical Language ↔ Plain English

Asthmatic Subjects Inclusion Criteria: * Previous asthma diagnosis * FEV1 bronchodilator reversibility ≥12% or airway hyperresponsiveness reflected by a methacholine PC20 ≤16 mg/mL (Historical methacholine data from previous NIH trial \[SARP I or II, AsthmaNet, ALA-ACRC, ACRN or CARE\] will be allowed). Exclusion Criteria: * Exclusion criteria include any of the following: * Pregnancy during the characterization phase * Current smoking, * Smoking history \> 10 pack years if ≥30 years of age, or smoking history \> 5 pack years if \<30 years of age (Note: if a subject has a smoking history, no smoking within the past year), * Other chronic pulmonary disorders associated with asthma-like symptoms, including (but not limited to) cystic fibrosis, chronic obstructive pulmonary disease, chronic bronchitis, vocal cord dysfunction (that is the sole cause of respiratory symptoms and at the PI's discretion), severe scoliosis or chest wall deformities that affect lung function, or congenital disorders of the lungs or airways, * History of premature birth before 35 weeks gestation, * Unwillingness to receive an intramuscular triamcinolone acetonide injection. * Evidence that the participant or family may be unreliable or poorly adherent to their asthma treatment or study procedures, * Planning to relocate from the clinical center area before study completion, * Any other criteria that place the subject at unnecessary risk according to the judgment of the Principal Investigator and/or attending physician(s) of record, or * Currently participating in an investigational drug trial. Healthy Controls: Inclusion Criteria * Healthy subjects between the age of 18 and 65 * At least 3 of the 7 subjects per center should be aged 35 or older Exclusion Criteria: * History of chronic diseases that affect the lungs: Chronic airway disease (asthma, cystic fibrosis, COPD, chronic bronchitis, bronchiectasis); Interstitial lung disease, sarcoidosis, occupational lung disease; Obstructive sleep apnea; Vocal cord dysfunction; Severe scoliosis or chest wall deformities. * A history suggestive of allergic rhinitis (based on the best judgment of the physician investigator). * A history of eczema. * Chronic sinusitis. * An improvement in FEV1 of more than 12% following 4 puffs of albuterol. * Chronic systemic diseases requiring ongoing anti-inflammatory treatment. * Current use of beta adrenergic blocking agent or a cholinesterase inhibitor (medicine used to treat myasthenia gravis or Alzheimer's disease). * Smoking history \> 10 pack years if ≥30 years of age, or smoking history \> 5 pack years if \<30 years of age (Note: if a subject has a smoking history, no smoking within the past year). * Respiratory tract infection within the past 4 weeks. * Pregnancy. * History of premature birth (\<35 weeks). * Any other criteria that place the subject at increased risk of complications from study procedures, according to the judgment of the Principal Investigator and/or attending physician(s) of record.

Outcomes

Primary Outcomes

Airway lumen mast cells

Determine the impact of mast cell markers on human airway epithelial cell phenotype and function.

Time frame: Once, during bronchoscopy

Longitudinal asthma phenotype

Determine the long term stability and implications of previously identified clinical and molecular asthma phenotypes, specifically the mast cell signature, and identify potential systemic biomarkers for these phenotypes. Determine whether a biomarker for the lung mast cell signature can be identified in serum/plasma of both adult and pediatric severe asthmatics

Time frame: Change rates, determined annually for three years