Characterization of Adults for Asthma Microbiome Research Studies

Healthy Clinical Trial

— CAARS  

Official title:

Characterization of Adults for Asthma Microbiome Research Studies (CAARS)

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT02887911
• Other study ID #: HUM00097163
• Secondary ID: 5R01AI129958
• Status: Completed
• Start date: December 22, 2015
• Est. completion date: March 13, 2020

Study information

• Verified date: July 2022
• Source: University of Michigan
• Contact: n/a
• Is FDA regulated: No
• Study type: Observational

Clinical Trial Summary

The purpose of this study is to characterize adult subjects regarding their history of allergy and asthma, clinical manifestations of asthma, and exposures and conditions that may influence asthma severity and control. Assessments include baseline medical history, lung function tests, questionnaires, and collection of specimens for phenotypic characterization.

Description:

This is a prospective, observational study in which approximately 200 subjects will be enrolled, including healthy controls, atopic controls without asthma, and patients with stable asthma (n = 150). Among asthmatics, 2/3 will be on regular inhaled corticosteroid therapy and 1/3 will not be taking inhaled corticosteroids. Subjects who meet study criteria will undergo phenotypic characterization in multiple domains, including evaluation of lung function, assessments of asthma/allergy history, asthma triggers, asthma symptom control, environmental microbial exposures and dietary intake. Oral rinse, sputum, stool, urine and blood specimens will be collected for microbiome-related analyses, including molecular and culture-based assays, metabolite studies, and to relate these to markers of inflammation and immune function. The overall goal is to enroll a cohort of well-characterized asthmatic and non-asthmatic control subjects to enable mechanism-oriented studies of how members of the airway microbiota and possibly also gut microbiota influence phenotypes of adult asthma.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 171
• Est. completion date: March 13, 2020
• Est. primary completion date: March 13, 2020
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: All
• Age group: 18 Years to 75 Years

Eligibility

1. For all subjects:

Inclusion criteria:

• Men/Women, ages 18-75, with or without current asthma, are eligible to be screened.

Exclusion criteria:

• Cigarette smoking history of >30 total pack-years

• Current use of other smoked products or recreational drugs (e.g. pipes, cigars, e-cigarettes, other illicit drugs)

• History of lung disease other than asthma

• Recent upper respiratory tract infection treated with antibiotics within 8 weeks of visit 1

• Recent antibiotic use (except topical or ocular) within 8 weeks of visit 1 (chronic antibiotic use for asthma management allowed)

• Currently pregnant or breast-feeding

• Other medical conditions or treatments that may increase subject risk or affect study results, based on study physician judgment. These include the following: significant cardiovascular disease(+/- active symptoms), arrhythmia, or stroke, active cancer, post-organ transplant

• Any other condition for which subject is taking immunosuppressive therapies (except steroids for asthma)

• History of allergy to albuterol or methacholine

2. For asthma subjects only:

Note: Enrollment target is for 90 asthmatics already taking inhaled corticosteroids prescribed by their physician (any formulation and dose) and 60 subjects who are not currently using inhaled corticosteroid.

Additional inclusion criteria:

• History of asthma symptoms within the last 2 years (e.g. wheeze, shortness of breath, etc.)

• Evidence of stable asthma as assessed by initial screening

• No changes in asthma medications within 30 days of visit 1

• Methacholine PC20 (dose at which there is a 20 percent change) = 8 mg/ml (for those asthmatics on inhaled steroids, PC20 = 16 mg/ml), or change in FEV1 (forced expiratory volume in first second of spirometry effort)= 12% after 4 puffs of albuterol on reversibility testing (or PI discretion)

• If negative methacholine challenge or no evidence of bronchodilator reversibility, a strong history of physician-diagnosed/physician-managed asthma may allow for study inclusion, based on PI's judgement or discretion.

• Individuals with a history of physician-diagnosed asthma who have had bronchodilator reversibility testing or methacholine challenge performed within 60 days of screening may be enrolled and these existing test results used in lieu of repeating the same test at visit 1 or visit 2.

Additional exclusion criteria:

• An asthma exacerbation requiring treatment with oral or IV steroids within 1 month of visit 1

• No asthma symptoms within the last 2 years

3. For healthy control or atopic non-asthma subjects:

Additional exclusion criteria:

• Evidence of abnormal lung function by any of the following: FEV1/FVC ratio <0.70, FEV1 or FVC (forced vital capacity on spirometry) < 80% predicted, methacholine PC20 < 16 mg/ml, or FEV1 improvement > 12% in response to albuterol

• Atopic non-asthma subjects found to have evidence of abnormal lung function, but without a clear or recent history of asthma, may be enrolled per PI's discretion.

• Possible pulmonary disease is identified by PI or Co-Is to explain an abnormal lung function result at the time of testing. The subject may be re-screened later at investigator's discretion.

Related Conditions & MeSH terms

• Asthma
• Healthy

Locations

Country	Name	City	State
United States	University of Michigan	Ann Arbor	Michigan

Sponsors (2)

Lead Sponsor	Collaborator
University of Michigan	National Institute of Allergy and Infectious Diseases (NIAID)

Country where clinical trial is conducted

United States, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Other	To apply culture and molecular methods to study functions of asthma-associated airway microbiota in corticosteroid-enriched environments		Day 1" for the first one and "up to 60 days"
Other	To evaluate the temporal stability of the airway microbiome in asthmatic and healthy subjects		Day 1" for the first one and "up to 60 days"
Other	To explore relationships between airway and gut microbiome composition in asthma, including among obese subjects		Day 1" for the first one and "up to 60 days"
Primary	To characterize adult subjects with asthma in multiple domains, including disease severity and control, patterns of airway inflammation, microbial exposures and patterns of airway and gut microbial colonization		Day 1" for the first one and "up to 60 days"
Secondary	To evaluate differences in airway and gut microbiota composition related to inhaled corticosteroid use (ICS) among asthmatics already regularly taking ICS, asthmatics not taking ICS, and healthy controls		Day 1" for the first one and "up to 60 days"