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Composition and energy harvesting capacity of the gut microbiota: relationship to diet, obesity and time in mouse models
Alimentary Pharmabiotic Centre, University College Cork, Cork, Ireland; Alimentary Health Ltd, Cork, Ireland.
Alimentary Pharmabiotic Centre, University College Cork, Cork, Ireland; Teagasc Moorepark Food Research Centre, Fermoy, Ireland.
Alimentary Health Ltd, Cork, Ireland.
Alimentary Pharmabiotic Centre, University College Cork, Cork, Ireland; Teagasc Moorepark Food Research Centre, Fermoy, Ireland.ORCID-id: 0000-0001-8591-0799
Vise andre og tillknytning
2010 (engelsk)Inngår i: Gut, ISSN 0017-5749, E-ISSN 1468-3288, Vol. 59, nr 12, s. 1635-42Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

BACKGROUND AND AIMS: Increased efficiency of energy harvest, due to alterations in the gut microbiota (increased Firmicutes and decreased Bacteroidetes), has been implicated in obesity in mice and humans. However, a causal relationship is unproven and contributory variables include diet, genetics and age. Therefore, we explored the effect of a high-fat (HF) diet and genetically determined obesity (ob/ob) for changes in microbiota and energy harvesting capacity over time.

METHODS: Seven-week-old male ob/ob mice were fed a low-fat diet and wild-type mice were fed either a low-fat diet or a HF-diet for 8 weeks (n=8/group). They were assessed at 7, 11 and 15 weeks of age for: fat and lean body mass (by NMR); faecal and caecal short-chain fatty acids (SCFA, by gas chromatography); faecal energy content (by bomb calorimetry) and microbial composition (by metagenomic pyrosequencing).

RESULTS: A progressive increase in Firmicutes was confirmed in both HF-fed and ob/ob mice reaching statistical significance in the former, but this phylum was unchanged over time in the lean controls. Reductions in Bacteroidetes were also found in ob/ob mice. However, changes in the microbiota were dissociated from markers of energy harvest. Thus, although the faecal energy in the ob/ob mice was significantly decreased at 7 weeks, and caecal SCFA increased, these did not persist and faecal acetate diminished over time in both ob/ob and HF-fed mice, but not in lean controls. Furthermore, the proportion of the major phyla did not correlate with energy harvest markers.

CONCLUSION: The relationship between the microbial composition and energy harvesting capacity is more complex than previously considered. While compositional changes in the faecal microbiota were confirmed, this was primarily a feature of high-fat feeding rather than genetically induced obesity. In addition, changes in the proportions of the major phyla were unrelated to markers of energy harvest which changed over time. The possibility of microbial adaptation to diet and time should be considered in future studies.

sted, utgiver, år, opplag, sider
BMJ Publishing Group Ltd, 2010. Vol. 59, nr 12, s. 1635-42
HSV kategori
Identifikatorer
URN: urn:nbn:se:oru:diva-65934DOI: 10.1136/gut.2010.215665ISI: 000284109200009PubMedID: 20926643Scopus ID: 2-s2.0-78649887273OAI: oai:DiVA.org:oru-65934DiVA, id: diva2:1192018
Forskningsfinansiär
NIH (National Institute of Health), RO1 DK058855
Merknad

Funding Agencies:

Teagasc (an Agency of the Irish Government Department of Agriculture, Fisheries and Food)

Science Foundation Ireland

Alimentary Health Ltd

Tilgjengelig fra: 2018-03-21 Laget: 2018-03-21 Sist oppdatert: 2019-04-24bibliografisk kontrollert

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Marques, Tatiana M.

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