TY - JOUR
T1 - Soluble fibre supplementation with and without a probiotic in adults with asthma
T2 - A 7-day randomised, double blind, three way cross-over trial
AU - McLoughlin, Rebecca
AU - Berthon, Bronwyn S.
AU - Rogers, Geraint B.
AU - Baines, Katherine J.
AU - Leong, Lex E.X.
AU - Gibson, Peter G.
AU - Williams, Evan J.
AU - Wood, Lisa G.
N1 - ©2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license
PY - 2019/8/1
Y1 - 2019/8/1
N2 - Background: Soluble fibre modulates airway inflammation in animal models. The aim of this study was to investigate the effects of soluble fibre supplementation, with and without a probiotic, on plasma short chain fatty acids (SCFA), airway inflammation, asthma control and gut microbiome in adults with asthma. Methods: A randomised, double-blinded, placebo controlled 3-way cross-over trial in 17 subjects with stable asthma at the Hunter Medical Research Institute, Newcastle, Australia. Subjects received 3 × 7 day oral interventions in random order; soluble fibre (inulin 12 g/day), soluble fibre + probiotic (inulin 12 g/day + multi-strain probiotic >25 billion CFU) and placebo. Plasma SCFA, sputum cell counts and inflammatory gene expression, asthma control gut microbiota, adverse events including gastrointestinal symptoms were measured. Findings: There was no difference in change in total plasma SCFA levels (μmol/L) in the placebo versus soluble fibre (Δmedian [95% CI] 16·3 [−16·9, 49·5], p = 0·335) or soluble fibre+probiotic (18·7 [−14·5, 51·9], p = 0·325) group. Following the soluble fibre intervention there was an improvement in the asthma control questionnaire (ACQ6) (∆median (IQR) -0·35 (−0·5, −0·13), p = 0·006), sputum %eosinophils decreased (−1.0 (−2·5, 0), p = 0·006) and sputum histone deacetylase 9 (HDAC9) gene expression decreased (−0.49 (−0.83, −0.27) 2-ΔCt, p =.008). Individual bacterial operational taxonomic units changed following both inulin and inulin+probiotic arms. Interpretation: Soluble fibre supplementation for 7 days in adults with asthma did not change SCFA levels. Within group analysis showed improvements in airway inflammation, asthma control and gut microbiome composition following inulin supplementation and these changes warrant further investigation, in order to evaluate the potential of soluble fibre as a non-pharmacological addition to asthma management. Fund: John Hunter Hospital Charitable Trust.
AB - Background: Soluble fibre modulates airway inflammation in animal models. The aim of this study was to investigate the effects of soluble fibre supplementation, with and without a probiotic, on plasma short chain fatty acids (SCFA), airway inflammation, asthma control and gut microbiome in adults with asthma. Methods: A randomised, double-blinded, placebo controlled 3-way cross-over trial in 17 subjects with stable asthma at the Hunter Medical Research Institute, Newcastle, Australia. Subjects received 3 × 7 day oral interventions in random order; soluble fibre (inulin 12 g/day), soluble fibre + probiotic (inulin 12 g/day + multi-strain probiotic >25 billion CFU) and placebo. Plasma SCFA, sputum cell counts and inflammatory gene expression, asthma control gut microbiota, adverse events including gastrointestinal symptoms were measured. Findings: There was no difference in change in total plasma SCFA levels (μmol/L) in the placebo versus soluble fibre (Δmedian [95% CI] 16·3 [−16·9, 49·5], p = 0·335) or soluble fibre+probiotic (18·7 [−14·5, 51·9], p = 0·325) group. Following the soluble fibre intervention there was an improvement in the asthma control questionnaire (ACQ6) (∆median (IQR) -0·35 (−0·5, −0·13), p = 0·006), sputum %eosinophils decreased (−1.0 (−2·5, 0), p = 0·006) and sputum histone deacetylase 9 (HDAC9) gene expression decreased (−0.49 (−0.83, −0.27) 2-ΔCt, p =.008). Individual bacterial operational taxonomic units changed following both inulin and inulin+probiotic arms. Interpretation: Soluble fibre supplementation for 7 days in adults with asthma did not change SCFA levels. Within group analysis showed improvements in airway inflammation, asthma control and gut microbiome composition following inulin supplementation and these changes warrant further investigation, in order to evaluate the potential of soluble fibre as a non-pharmacological addition to asthma management. Fund: John Hunter Hospital Charitable Trust.
KW - Asthma
KW - Free fatty acid receptors
KW - Histone deacetylases
KW - Inflammation
KW - Inulin
KW - SCFAs
KW - Soluble fibre
UR - http://www.scopus.com/inward/record.url?scp=85069923653&partnerID=8YFLogxK
U2 - 10.1016/j.ebiom.2019.07.048
DO - 10.1016/j.ebiom.2019.07.048
M3 - Article
AN - SCOPUS:85069923653
SN - 2352-3964
VL - 46
SP - 473
EP - 485
JO - EBioMedicine
JF - EBioMedicine
ER -