Sorting and Expression Profiling of Airway Cells From Humans (The SEARCH Study)

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

COMPLETED

Total Enrollment

32 participants

Study Classification

OBSERVATIONAL

Study Start Date

2017-01-31

Study Completion Date

2023-03-31

Brief Summary

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This will be a single site, mechanistic study of asthmatic subjects and healthy, non-asthmatic controls involving a baseline characterization visit and a research bronchoscopy visit. We will identify differences in airway epithelial epigenetic enhancer signatures in asthma, by analyzing freshly isolated airway epithelial cells from healthy controls and from well-characterized subjects with asthma.

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Detailed Description

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The airway epithelium is critical for normal lung function and changes in the epithelium are central to the development of asthma. Precise regulation of gene transcription is essential for airway epithelial cell differentiation and transcription changes lead to many abnormalities seen in asthma. Despite the dominant role of enhancers in regulating transcription, little is known about how these DNA regulatory elements control airway epithelial cell transcription or about how enhancer activity differs in asthma compared to health. Closing this knowledge gap will have a major impact on our understanding of normal epithelial development and asthma. In addition, enhancer-based approaches for reprogramming the airway epithelium promise to be powerful tools for dissecting mechanism that will set the stage for developing a new class of precisely targeted treatments for asthma. Our overall goals are to identify enhancers that are important in regulation of key airway epithelial cell genes, to determine how enhancer activity changes in asthma, and to develop approaches for targeting the activity of these enhancers.

Conditions

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Asthma

Study Design

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Observational Model Type

CASE_CONTROL

Study Time Perspective

CROSS_SECTIONAL

Study Groups

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Asthma

Participants with a history of asthma

No interventions assigned to this group

Healthy controls

Participants without a history of asthma

No interventions assigned to this group

Asthma Bronchoscopy sub-group

Participants with a history of asthma who will undergo the same procedures as other healthy controls with the addition of bronchoscopy

No interventions assigned to this group

Healthy Bronchoscopy sub-group

Participants without a history of asthma who will undergo the same procedures as other healthy controls with the addition of bronchoscopy

No interventions assigned to this group

Eligibility Criteria

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Inclusion Criteria

1. Male and female subjects between the ages of 18 and 70 years
2. Ability to provide written informed consent and ability to comply with the requirements of the study
3. No hyperreactivity to methacholine (PC20 FEV1 Methacholine \>16 mg/mL)
4. No history of allergic rhinitis/seasonal allergies

1. Male and female subjects between the ages of 18 and 70 years
2. Ability to provide written informed consent and ability to comply with the requirements of the study
3. History of asthma
4. No use of oral or inhaled corticosteroids for the treatment of asthma during the past 6 weeks
5. Hyperreactivity to methacholine (PC20 FEV1 Methacholine \< 8 mg/ml)

Exclusion Criteria

1. Current smokers, defined by (a) \>5 cigarettes smoked in past 12 months, and (b) ≤ 8 weeks since last time smoking; or former smokers who have a total smoking history ≥10 pack-years
2. Pregnant, breastfeeding, or unwilling to practice birth control during participation in the study
3. Subjects with a history of lung disease other than asthma
4. Subjects with a history of a medical disease, which in the opinion of the Investigator may put the subject at extra risk from study-related procedures or because the disease may influence the results of the study
5. Prior esophageal hernia surgery.
6. Current participation in an investigational drug trial

Minimum Eligible Age

18 Years

Maximum Eligible Age

70 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

Yes