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  • The lower airway microbiota in early cystic fibrosis lung disease: a longitudinal analysis

    Author(s)
    Frayman, Katherine B
    Armstrong, David S
    Carzino, Rosemary
    Ferkol, Thomas W
    Grimwood, Keith
    Storch, Gregory A
    Teo, Shu Mei
    Wylie, Kristine M
    Ranganathan, Sarath C
    Griffith University Author(s)
    Grimwood, Keith
    Year published
    2017
    Metadata
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    Abstract
    Rationale In infants and young children with cystic fibrosis, lower airway infection and inflammation are associated with adverse respiratory outcomes. However, the role of lower airway microbiota in the pathogenesis of early cystic fibrosis lung disease remains uncertain. Objectives To assess the development of the lower airway microbiota over time in infants and young children with cystic fibrosis, and to explore its association with airway inflammation and pulmonary function at age 6 years. Methods Serial, semi-annual bronchoscopies and bronchoalveolar lavage (BAL) procedures were performed in infants newly diagnosed ...
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    Rationale In infants and young children with cystic fibrosis, lower airway infection and inflammation are associated with adverse respiratory outcomes. However, the role of lower airway microbiota in the pathogenesis of early cystic fibrosis lung disease remains uncertain. Objectives To assess the development of the lower airway microbiota over time in infants and young children with cystic fibrosis, and to explore its association with airway inflammation and pulmonary function at age 6 years. Methods Serial, semi-annual bronchoscopies and bronchoalveolar lavage (BAL) procedures were performed in infants newly diagnosed with cystic fibrosis following newborn screening. Quantitative microbiological cultures and inflammatory marker (interleukin 8 and neutrophil elastase) measurements were undertaken contemporaneously. 16S ribosomal RNA gene sequencing was conducted on stored BAL samples. Spirometry results recorded at 6 years of age were extracted from medical records. Measurements and main results Ninety-five BAL samples provided 16S ribosomal RNA gene data. These were collected from 48 subjects aged 1.2–78.3 months, including longitudinal samples from 27 subjects and 13 before age 6 months. The lower airway microbiota varied, but diversity decreased with advancing age. Detection of recognised cystic fibrosis bacterial pathogens was associated with reduced microbial diversity and greater lower airway inflammation. There was no association between the lower airway microbiota and pulmonary function at age 6 years. Conclusions In infants with cystic fibrosis, the lower airway microbiota is dynamic. Dominance of the microbiota by recognised cystic fibrosis bacterial pathogens is associated with increased lower airway inflammation, however early microbial diversity is not associated with pulmonary function at 6 years of age.
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    Journal Title
    Thorax
    Volume
    72
    DOI
    https://doi.org/10.1136/thoraxjnl-2016-209279
    Subject
    Clinical Sciences not elsewhere classified
    Clinical Sciences
    Publication URI
    http://hdl.handle.net/10072/364253
    Collection
    • Journal articles

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