Microbiota and SCFA in Lean and Overweight Healthy Subjects
Andreas Schwiertz,David Taras,Klaus Schäfer,Silvia Beijer,Nicolaas A. Bos,Christiane Donus,Philip D. Hardt +6 more
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TLDR
The results contradict previous reports with regard to the contribution of various bacterial groups to the development of obesity and this issue remains controversial.Abstract:
Obesity has recently been linked to the composition of human microbiota and the production of short chain fatty acids (SCFAs). However, these findings rely on experimental studies carried out using rather small and defined groups of volunteers or model animals. Our aim was to evaluate differences within the human intestinal microbiota and fecal SCFA concentration of lean and obese subjects. A total of 98 subjects volunteered to take part in this study. The BMI in kg/m(2) of 30 volunteers was within the lean range, 35 were overweight and 33 were obese. The fecal microbiota was characterized by real-time PCR analyses. With the primers used herein we were able to cover 82.3% (interquartile range of 68.3-91.4%) of the total microbiota detectable with a universal primer. In addition, the concentration of SCFA was evaluated. The total amount of SCFA was higher in the obese subject group (P = 0.024) than in the lean subject group. The proportion of individual SCFA changed in favor of propionate in overweight (P = 0.019) and obese subjects (P = 0.028). The most abundant bacterial groups in faeces of lean and obese subjects belonged to the phyla Firmicutes and Bacteroidetes. The ratio of Firmicutes to Bacteroidetes changed in favor of the Bacteroidetes in overweight (P = 0.001) and obese subjects (P = 0.005). Our results are in line with previous reports suggesting that SCFA metabolism might play a considerable role in obesity. However, our results contradict previous reports with regard to the contribution of various bacterial groups to the development of obesity and this issue remains controversial.read more
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Enterotypes of the human gut microbiome
Manimozhiyan Arumugam,Jeroen Raes,Eric Pelletier,Denis Le Paslier,Takuji Yamada,Daniel R. Mende,Gabriel Fernandes,Julien Tap,Thomas Brüls,Jean-Michel Batto,Marcelo Bertalan,Natalia Borruel,Francesc Casellas,Leyden Fernández,Laurent Gautier,Torben Hansen,Masahira Hattori,Tetsuya Hayashi,Michiel Kleerebezem,Ken Kurokawa,Marion Leclerc,Florence Levenez,Chaysavanh Manichanh,H. Bjørn Nielsen,Trine Nielsen,Nicolas Pons,Julie Poulain,Junjie Qin,Thomas Sicheritz-Pontén,Sebastian Tims,David Torrents,Edgardo Ugarte,Erwin G. Zoetendal,Jun Wang,Francisco Guarner,Oluf Pedersen,Willem M. de Vos,Søren Brunak,Joël Doré,Jean Weissenbach,S. Dusko Ehrlich,Peer Bork +41 more
TL;DR: Three robust clusters (referred to as enterotypes hereafter) are identified that are not nation or continent specific and confirmed in two published, larger cohorts, indicating that intestinal microbiota variation is generally stratified, not continuous.
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From Dietary Fiber to Host Physiology: Short-Chain Fatty Acids as Key Bacterial Metabolites
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The role of short-chain fatty acids in the interplay between diet, gut microbiota, and host energy metabolism
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