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Airway Microbiome in Asthma: Relationships to Asthma Phenotype and Inhaled Corticosteroid Treatment
There are new, very sensitive methods for detecting bacteria. These methods show that hundreds of millions of microbes (organisms that can only be seen with microscopes), especially bacteria, live in healthy people. The collection of different microbes found in a site is called a "microbiome." The investigators know that microbiomes of the skin, sinuses, mouth, gastro-intestinal tract, etc. differ from each other. The make-up of the microbiome - which bacteria are found in a site - may be necessary for good health. For example, the microbiome of the mouth is different in people with inflammation of the gums (periodontitis), and the microbiome of the bowel is different in people with inflammation of the intestinal tract (inflammatory bowel disease).
The purpose of this research study is to find out if the microbiome in the lungs is different in healthy people without asthma compared to people with asthma. This study will also find out if the microbiome of the lungs changes when people with asthma take a daily "controller" medication called an inhaled corticosteroid.
Studie Overzicht
Toestand
Interventie / Behandeling
Gedetailleerde beschrijving
Studietype
Inschrijving (Werkelijk)
Fase
- Niet toepasbaar
Contacten en locaties
Studie Locaties
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California
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San Francisco, California, Verenigde Staten, 94143-0130
- University of California, San Francisco, Adult
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Colorado
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Denver, Colorado, Verenigde Staten, 80206
- National Jewish Health
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Illinois
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Chicago, Illinois, Verenigde Staten, 60611
- Northwestern Memorial Hospital
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Massachusetts
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Boston, Massachusetts, Verenigde Staten, 02115
- Brigham & Women's Hospital
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Missouri
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St. Louis, Missouri, Verenigde Staten, 63110
- Washington University
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North Carolina
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Durham, North Carolina, Verenigde Staten, 27110
- Duke University School of Medicine
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Winston-Salem, North Carolina, Verenigde Staten, 27157
- Wake Forest University Health Sciences
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Pennsylvania
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Pittsburgh, Pennsylvania, Verenigde Staten, 15213
- University of Pittsburgh, Adult
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Wisconsin
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Madison, Wisconsin, Verenigde Staten, 53972
- University of Wisconsin
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Deelname Criteria
Geschiktheidscriteria
Leeftijden die in aanmerking komen voor studie
Accepteert gezonde vrijwilligers
Geslachten die in aanmerking komen voor studie
Beschrijving
Inclusion Criteria:
Asthmatic:
- History of physician-diagnosed asthma.
- Methacholine PC20 < 8mg/ml and/or FEV1 improvement ≥ 12% in response to 180 mcg albuterol.
- FEV1 ≥ 70% of predicted after 180 mcg albuterol.
- Stable asthma for ≥ 3 months prior to enrollment (no urgent care visits, no systemic corticosteroid treatment).
- Asthma Control Questionnaire 6 Score < 1.5.
- Able to provide informed consent.
- Able to perform spirometry as per ATS criteria.
- Evidence by allergen skin test of sensitivity to an aeroallergen.
- Willingness, if female and able to conceive, to utilize one medically-acceptable form of contraception.
Healthy Control:
- Evidence by allergen skin test of sensitivity to an aeroallergen.
- Able to provide informed consent.
- Able to perform spirometry as per ATS criteria.
Exclusion Criteria:
Asthmatic:
- Presence of lung disease other than asthma.
- Use of > 10 doses of nasal corticosteroids in the previous 3 months.
- Presence of significant medical illness or other chronic diseases whose treatment could affect the clinical features measured, responses to the therapies to be given in this study, or risks of participating in the study.
- History of atrial or ventricular tachyarrhythmia.
- Changes suggestive of cardiac ischemia on ECG at baseline.
- History of upper respiratory infection, sinusitis, bronchitis, or antibiotic use in the previous 3 months.
- History of chronic sinus disease.
- Smoking > 5 pack-years, or within the past year
- History of long-term controller medication use for asthma (inhaled or oral corticosteroid, leukotriene pathway antagonist, cromolyn, or theophylline within the preceding 6 months.
- History of bleeding disorder.
- Reduced creatinine clearance.
- Inability, in the opinion of the Study Investigator, to coordinate use of inhaler or otherwise comply with medication regimens.
- Contraindication to bronchoscopy on history or examination.
Healthy Control:
- History of chronic respiratory disease including asthma.
- Presence of significant medical illness or other chronic diseases whose treatment could affect the clinical features measured, responses to the therapies to be given in this study, or risks of participating in the study.
- History of atrial or ventricular tachyarrhythmia.
- Changes suggestive of cardiac ischemia on ECG at baseline.
- History of upper respiratory infection, sinusitis, bronchitis, or antibiotic use in the previous 3 months.
- Methacholine PC20 < 16 mg/ml or FEV1 improvement ≥ 12% in response to albuterol.
- History of chronic sinus disease
- Smoking > 5 pack-years, or within the past year
- Use of > 10 doses of a nasal corticosteroid preparation in the previous 3 months
- FEV1 or FVC < 80% predicted.
- History of bleeding disorder.
- Reduced creatinine clearance.
- Contraindication to bronchoscopy on history or examination.
Studie plan
Hoe is de studie opgezet?
Ontwerpdetails
- Toewijzing: Gerandomiseerd
- Interventioneel model: Parallelle opdracht
- Masker: Verviervoudigen
Wapens en interventies
Deelnemersgroep / Arm |
Interventie / Behandeling |
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Geen tussenkomst: Gezonde controle
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Experimenteel: Inhaled corticosteroid
Fluticasone (250 mcg/puff, one puff, twice a day)
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Dry Powder Inhaler: 250 mcg/puff, one puff, twice a day
Andere namen:
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Placebo-vergelijker: Placebo
Placebo fluticasone (one puff, twice a day)
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Dry Powder Inhaler: Placebo
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Geen tussenkomst: Atopic Non-asthmatics
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Wat meet het onderzoek?
Primaire uitkomstmaten
Uitkomstmaat |
Maatregel Beschrijving |
Tijdsspanne |
|---|---|---|
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Microbial Community Richness
Tijdsspanne: baseline and after 6 weeks of treatment
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Richness is the total number of different bacterial taxa detected in the sample.
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baseline and after 6 weeks of treatment
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Microbial Community Diversity
Tijdsspanne: baseline and after 6 weeks of treatment
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The Shannon diversity index is a type of entropy measure and is a function of the distribution of the total number of organisms across all of the species.
If S is the total number of species in the sample and p_i is the number of organisms in the i-th species divided by the total number of organisms, then Diversity = -Σ p_i log(p_i).
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baseline and after 6 weeks of treatment
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Microbial Community Evenness
Tijdsspanne: baseline and after 6 weeks of treatment
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Pielou's evenness index is a scaled measure of biodiversity and is equal to the observed Shannon diversity index divided by the maximum possible Shannon diversity index, which would occur if all of the species in the sample were equally abundant.
Evenness = D/log(S), where D is the Shannon Diversity index and log(S) is the maximum diversity of the sample.
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baseline and after 6 weeks of treatment
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Medewerkers en onderzoekers
Sponsor
Onderzoekers
- Hoofdonderzoeker: Lewis Smith, MD, Northwestern Memorial Hospital
- Hoofdonderzoeker: Richard Martin, MD, National Jewish Health
- Hoofdonderzoeker: Christine Sorkness, MD, University of Wisconsin, Madison
- Hoofdonderzoeker: Sally Wenzel, MD, University of Pittsburgh Medical Center
- Hoofdonderzoeker: Stephen Peters, MD, Wake Forest University Health Sciences
Publicaties en nuttige links
Studie record data
Bestudeer belangrijke data
Studie start
Primaire voltooiing (Werkelijk)
Studie voltooiing (Werkelijk)
Studieregistratiedata
Eerst ingediend
Eerst ingediend dat voldeed aan de QC-criteria
Eerst geplaatst (Schatting)
Updates van studierecords
Laatste update geplaatst (Schatting)
Laatste update ingediend die voldeed aan QC-criteria
Laatst geverifieerd
Meer informatie
Termen gerelateerd aan deze studie
Aanvullende relevante MeSH-voorwaarden
- Ziekten van de luchtwegen
- Ziekten van het immuunsysteem
- Longziekten
- Overgevoeligheid, Onmiddellijk
- Bronchiale ziekten
- Longziekten, obstructief
- Ademhalingsovergevoeligheid
- Overgevoeligheid
- Astma
- Fysiologische effecten van medicijnen
- Autonome agenten
- Agenten van het perifere zenuwstelsel
- Ontstekingsremmende middelen
- Dermatologische middelen
- Bronchusverwijdende middelen
- Anti-astmatische middelen
- Agenten van het ademhalingssysteem
- Anti-allergische middelen
- Fluticason
Andere studie-ID-nummers
- AsthmaNet 003
- U10HL098115 (Subsidie/contract van de Amerikaanse NIH)
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