Colonic transit time is related to bacterial metabolism and mucosal turnover in the human gut

Henrik Munch Roager, Lea Benedicte Skov Hansen, Martin Iain Bahl, Henrik Lauritz Frandsen, Vera Carvalho, Rikke J. Gøbel, Marlene Danner Dalgaard, Damian Rafal Plichta, Morten Sparholt, Henrik Vestergaard, Torben Hansen, Thomas Sicheritz-Pontén, Henrik Bjørn Nielsen, Oluf Pedersen, Lotte Lauritzen, Mette Kristensen, Tine Rask Licht

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Abstract

Little is known about how colonic transit time relates to human colonic metabolism, and its importance for host health, although stool consistency, a proxy for colonic transit time, has recently been negatively associated with gut microbial richness. To address the relationships between colonic transit time and the gut microbial composition and metabolism, we assessed the colonic transit time of 98 subjects using radiopaque markers, and profiled their gut microbiota by16S rRNA gene sequencing and their urine metabolome by ultra performance liquid chromatography mass spectrometry. Based on correlation analyses, we show that colonic transit time is associated with overall gut microbial composition, diversity and metabolism. A relatively prolonged colonic transit time associates with high microbial species richness and a shift in colonic metabolism from carbohydrate fermentation to protein catabolism as reflected by higher urinary levels of potentially deleterious protein-derived metabolites. Additionally, shorter colonic transit time correlates with metabolites likely reflecting increased renewal of the colonic mucosa. Together, this suggests that a high gut microbial richness does not per se imply a healthy gut microbial ecosystem and points at colonic transit time as a highly important factor to consider in microbiome and metabolomics studies.
Original languageEnglish
Publication date2016
Number of pages1
Publication statusPublished - 2016
Event13th NuGOweek PHENOTYPES AND PREVENTION - THE INTERPLAY OF GENES, LIFE-STYLE FACTORS AND GUT ENVIRONMENT - University of Copenhagen, Copenhagen, Denmark
Duration: 5 Sep 20168 Sep 2016
Conference number: 13

Conference

Conference13th NuGOweek PHENOTYPES AND PREVENTION - THE INTERPLAY OF GENES, LIFE-STYLE FACTORS AND GUT ENVIRONMENT
Number13
LocationUniversity of Copenhagen
Country/TerritoryDenmark
CityCopenhagen
Period05/09/201608/09/2016

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