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Characterization of Airway Mucus in Bronchiectasis Patients and Healthy Controls

20. juli 2017 opdateret af: University of North Carolina, Chapel Hill
Analysis of mucus, mucin and DNA concentration, MUC5B/5AC ratio, rheology, osmotic pressure, cohesion and nucleotides in sputum on 30 individual samples of good quality in healthy individuals and those with bronchiectasis. (60 total)

Studieoversigt

Status

Afsluttet

Betingelser

Detaljeret beskrivelse

In this study the investigators will investigate the mucus properties in individuals with idiopathic bronchiectasis and healthy individuals without a history of lung disease. In order to understand how mucus is abnormal in disease conditions, the investigators need to understand the mucus biochemical and biophysical properties in healthy individuals. In this study the investigators will prospectively recruit patients with bronchiectasis and healthy individuals from the community to provide airway sputum samples. In these samples the investigators will measure an array of mucus properties. This will help our understanding of the mucus-obstructive lung diseases and facilitate the development of appropriate and effective disease prevention strategies.

A key question is whether mucus is hyper-concentrated and has abnormal biophysical properties in individuals with mucus-obstructive lung disease. To answer this question, the investigators need to understand the properties of the mucus in individuals with idiopathic bronchiectasis and no history of lung disease. This study will allow us to collect airway mucus (sputum) from individuals with bronchiectasis and healthy individuals with no history of lung disease.

Undersøgelsestype

Observationel

Tilmelding (Faktiske)

30

Kontakter og lokationer

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

Studiesteder

  • Forenede Stater
    • North Carolina
      • Chapel Hill, North Carolina, Forenede Stater, 27599
        • Center for Environmental Medicine Asthma and Lung Biology
      • Chapel Hill, North Carolina, Forenede Stater, 27599
        • Marsico Research Institure at Meadowmont

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 99 år (Voksen, Ældre voksen)

Tager imod sunde frivillige

Ja

Køn, der er berettiget til at studere

Alle

Prøveudtagningsmetode

Ikke-sandsynlighedsprøve

Studiebefolkning

The proposed study will recruit 30 patients with bronchiectasis and 30 healthy individuals with no history of lung disease aged over the age of 18 years.

Beskrivelse

Participants who meet all the following criteria are eligible for the study:

  • Written informed consent
  • Bronchiectasis patients: Available CT of the chest that shows evidence of dilated airways fulfilling radiographic criteria for bronchiectasis in more than one lobe and chronic cough.

Participants who meet any of the following criteria will not be eligible for the study:

  • Healthy individuals: A history of lung disease, current asthma symptoms or medication use, premature birth (<37 week gestation), a history of lung disease of infancy, or neurological or cardiovascular illness, current smoker or a history of smoking tobacco products.
  • Bronchiectasis patients: Premature birth (<37 week gestation), a history of lung disease of infancy, or neurological or cardiovascular illness.
  • Younger than 18 years of age

Studieplan

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

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

Kohorter og interventioner

Gruppe / kohorte
control
healthy individuals with no history of lung disease
bronchiectasis patients
individuals with a diagnoses of bronchiectasis

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Mucus concentration (% solids)
Tidsramme: 6 months
The percentage of solid content of sputum (an index of hydration) will be calculated my measuring the wet to dry weight ratio using a microbalance (mean percent solids ± standard deviation).
6 months

Sekundære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Biophysical properties of mucus by rheology
Tidsramme: 6 months
The rheological properties of the sputum will be assayed by macro-rheology (cone and plate) and microbead rheology. Macro-rheology provides measures of the viscosity (median log viscosity in Pascal (range)) and elasticity (median log elasticity in Pascal (range) of the sputum. Microbead rheology is performed by analyzing the diffusive motion of embedded 1μm tracer particles (6). The primary outcome measure from microbead rheology will be the mean square displacement MSD(Mean squared displacement) (median MSD cm2 s-1 (range)).
6 months
Mucin composition by mass spectroscopy
Tidsramme: 6 months
We will use mass spectroscopy to determine the relative abundance of the two major polymeric mucin proteins, MUC5B(Mucin type 5B)and MUC5AC(Mucin type 5AC), which are responsible for the viscoelastic properties of mucus.
6 months
Sputum extracellular nucleotide analysis
Tidsramme: 6 months
Sputum adenosine and adenine nucleotides will be ethenoderivatized and measured by HPLC(High performance liquid chromatography) analysis (7) (median nucleotide concentration in μg/ml (range)).
6 months
Osmotic Pressure
Tidsramme: 6 months
The osmotic pressure of the mucus will be assessed by placing an aliquot of mucus onto an osmometer with a 10kDa (10 kilodaltons) molecular weight polyethersulfone membrane (Millipore) separating the test chamber and reference chamber filled with PBS (phosphate-buffered saline) (mean osmotic pressure in Pascal ± standard deviation).
6 months
Total mucin concentration
Tidsramme: 6 months
Mucins will be quantitated using sepharose CL2B(Cross-linked derivative of Sepharose 2B) UPLC(Ultra performance liquid chromatography) coupled to an Optilab interference refractometer with a filter at 680 nm and parallel flow chambers for solvent and the solution (mean mucin concentration (μg/ml) ± standard deviation) (4). With this approach, we will ensure that the solute is at full Donnan equilibrium with the solution within the context of gel chromatography, which creates an accurate equilibration of solute and solvent. This procedure also separates the mucins from contaminating proteins, allowing the mucins to be isolated for biochemical studies. DNAse can be added if significant DNA is present.
6 months
polymeric DNA concentration
Tidsramme: 6 months
The quantification of free DNA will be performed using the DNA Quant-iT PicoGreen assay (Molecular Probes, Inc., Eugene, OR, USA), which utilizes an ultra-sensitive fluorescent nucleic acid stain for quantitating double-stranded DNA (median log DNA concentration (μg/ml) (range)).
6 months

Samarbejdspartnere og efterforskere

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

Sponsor

University of North Carolina, Chapel Hill

Efterforskere

  • Studiestol: Richard Boucher, MD, University of North Carolina, Chapel Hill
  • Ledende efterforsker: Kathryn Ramsey, University of North Carolina, Chapel Hill

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 (Faktiske)

10. marts 2017

Primær færdiggørelse (Faktiske)

27. juni 2017

Studieafslutning (Faktiske)

27. juni 2017

Datoer for studieregistrering

Først indsendt

14. april 2017

Først indsendt, der opfyldte QC-kriterier

18. april 2017

Først opslået (Faktiske)

24. april 2017

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

24. juli 2017

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

20. juli 2017

Sidst verificeret

1. juli 2017

Mere information

Begreber relateret til denne undersøgelse

Nøgleord

Yderligere relevante MeSH-vilkår

Andre undersøgelses-id-numre

  • 16-3142

Plan for individuelle deltagerdata (IPD)

Planlægger du at dele individuelle deltagerdata (IPD)?

INGEN

Lægemiddel- og udstyrsoplysninger, undersøgelsesdokumenter

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