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Airway Microbiome in Asthma: Relationships to Asthma Phenotype and Inhaled Corticosteroid Treatment

17. november 2016 opdateret af: dave mauger, Milton S. Hershey Medical Center

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.

Studieoversigt

Status

Afsluttet

Betingelser

Intervention / Behandling

Detaljeret beskrivelse

Two broad specific aims of this study are: 1)To evaluate whether the microbiota of the bronchial airways in atopic asthmatics and atopic healthy controls differ in microbial diversity, richness, evenness, or composition of specific bacterial taxa. 2) To determine whether inhaled corticosteroid treatment alters bronchial microbial community composition in asthmatics.

Undersøgelsestype

Interventionel

Tilmelding (Faktiske)

84

Fase

  • Ikke anvendelig

Kontakter og lokationer

Dette afsnit indeholder kontaktoplysninger for dem, der udfører undersøgelsen, og oplysninger om, hvor denne undersøgelse udføres.

Studiesteder

  • Forenede Stater
    • California
      • San Francisco, California, Forenede Stater, 94143-0130
        • University of California, San Francisco, Adult
    • Colorado
      • Denver, Colorado, Forenede Stater, 80206
        • National Jewish Health
    • Illinois
      • Chicago, Illinois, Forenede Stater, 60611
        • Northwestern Memorial Hospital
    • Massachusetts
      • Boston, Massachusetts, Forenede Stater, 02115
        • Brigham & Women's Hospital
    • Missouri
      • St. Louis, Missouri, Forenede Stater, 63110
        • Washington University
    • North Carolina
      • Durham, North Carolina, Forenede Stater, 27110
        • Duke University School of Medicine
      • Winston-Salem, North Carolina, Forenede Stater, 27157
        • Wake Forest University Health Sciences
    • Pennsylvania
      • Pittsburgh, Pennsylvania, Forenede Stater, 15213
        • University of Pittsburgh, Adult
    • Wisconsin
      • Madison, Wisconsin, Forenede Stater, 53972
        • University of Wisconsin

Deltagelseskriterier

Forskere leder efter personer, der passer til en bestemt beskrivelse, kaldet berettigelseskriterier. Nogle eksempler på disse kriterier er en persons generelle helbredstilstand eller tidligere behandlinger.

Berettigelseskriterier

Aldre berettiget til at studere

18 år til 60 år (Voksen)

Tager imod sunde frivillige

Ja

Køn, der er berettiget til at studere

Alle

Beskrivelse

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.

Studieplan

Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

  • Tildeling: Randomiseret
  • Interventionel model: Parallel tildeling
  • Maskning: Firedobbelt

Våben og indgreb

Deltagergruppe / Arm
Intervention / Behandling
Ingen indgriben: Sund kontrol
Eksperimentel: Inhaled corticosteroid
Fluticasone (250 mcg/puff, one puff, twice a day)
Medicin: fluticasone
Dry Powder Inhaler: 250 mcg/puff, one puff, twice a day
Andre navne:
  • Flovent 250
Placebo komparator: Placebo
Placebo fluticasone (one puff, twice a day)
Medicin: Placebo
Dry Powder Inhaler: Placebo
Ingen indgriben: Atopic Non-asthmatics

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Microbial Community Richness
Tidsramme: baseline and after 6 weeks of treatment
Richness is the total number of different bacterial taxa detected in the sample.
baseline and after 6 weeks of treatment
Microbial Community Diversity
Tidsramme: baseline and after 6 weeks of treatment
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).
baseline and after 6 weeks of treatment
Microbial Community Evenness
Tidsramme: baseline and after 6 weeks of treatment
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.
baseline and after 6 weeks of treatment

Samarbejdspartnere og efterforskere

Det er her, du vil finde personer og organisationer, der er involveret i denne undersøgelse.

Sponsor

Milton S. Hershey Medical Center

Samarbejdspartnere

National Heart, Lung, and Blood Institute (NHLBI)

Efterforskere

  • Ledende efterforsker: Lewis Smith, MD, Northwestern Memorial Hospital
  • Ledende efterforsker: Richard Martin, MD, National Jewish Health
  • Ledende efterforsker: Christine Sorkness, MD, University of Wisconsin, Madison
  • Ledende efterforsker: Sally Wenzel, MD, University of Pittsburgh Medical Center
  • Ledende efterforsker: Stephen Peters, MD, Wake Forest University Health Sciences

Publikationer og nyttige links

Den person, der er ansvarlig for at indtaste oplysninger om undersøgelsen, leverer frivilligt disse publikationer. Disse kan handle om alt relateret til undersøgelsen.

Generelle publikationer

Datoer for undersøgelser

Disse datoer sporer fremskridtene for indsendelser af undersøgelsesrekord og resumeresultater til ClinicalTrials.gov. Studieregistreringer og rapporterede resultater gennemgås af National Library of Medicine (NLM) for at sikre, at de opfylder specifikke kvalitetskontrolstandarder, før de offentliggøres på den offentlige hjemmeside.

Studer store datoer

Studiestart

1. oktober 2012

Primær færdiggørelse (Faktiske)

1. juli 2014

Studieafslutning (Faktiske)

1. juli 2014

Datoer for studieregistrering

Først indsendt

9. februar 2012

Først indsendt, der opfyldte QC-kriterier

16. februar 2012

Først opslået (Skøn)

23. februar 2012

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Skøn)

30. november 2016

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

17. november 2016

Sidst verificeret

1. november 2016

Mere information

Begreber relateret til denne undersøgelse

Yderligere relevante MeSH-vilkår

Andre undersøgelses-id-numre

  • AsthmaNet 003
  • U10HL098115 (U.S. NIH-bevilling/kontrakt)

Disse oplysninger blev hentet direkte fra webstedet clinicaltrials.gov uden ændringer. Hvis du har nogen anmodninger om at ændre, fjerne eller opdatere dine undersøgelsesoplysninger, bedes du kontakte register@clinicaltrials.gov. Så snart en ændring er implementeret på clinicaltrials.gov, vil denne også blive opdateret automatisk på vores hjemmeside .

Kliniske forsøg med fluticasone

Søg i lignende forsøg

Sponsorer og samarbejdspartnere

Medicinske tilstande

Narkotikainterventioner

CROs by country

CROs in Greece

Betingelser

Sjældne sygdomme

Narkotikainterventioner

Kosttilskud

Sponsor / samarbejdspartnere

Placeringer

Abonner