title: Metabolomics characterization of energy metabolism reveals glycogen accumulation in gut-microbiota-lacking mice.
abstract: Microbiota in the gut are considered an important environmental factor associated with host metabolism and physiology. Although gut microbiota are known to contribute to hepatic lipogenesis and fat storage, little is known about how the condition influences the deposition of glycogen in the liver. To better understand and characterize the host energy metabolism in guts lacking microbiota, we compared the liver metabolome of specific pathogen-free and germ-free mice by gas chromatography-mass spectrometry combined with partial least-squares discriminant analysis. We identified 30 of 52 highly reproducible peaks in chromatograms of liver tissue extracts from the two groups of mice. The two groups showed significant differences in metabolic profile. Changes in liver metabolism involved metabolites such as amino acids, fatty acids, organic acids and carbohydrates. The metabolic profile of germ-free mice suggests that they synthesize glycogen and accumulate it in the liver through gluconeogenesis and glycogenesis. Our findings shed light on a new perspective of the role of gut microbiota in energy metabolism and will be useful to help study probiotics, obesity and metabolic diseases.
authors.affiliation: National Laboratory Animal Center, National Applied Research Laboratories, Taipei 115, Taiwan.
authors.forename: Hsiao-Li
authors.initials: HL
authors.lastname: Chuang
authors.forename: Yen-Te
authors.initials: YT
authors.lastname: Huang
authors.forename: Chien-Chao
authors.initials: CC
authors.lastname: Chiu
authors.forename: Chia-Ding
authors.initials: CD
authors.lastname: Liao
authors.forename: Feng-Lin
authors.initials: FL
authors.lastname: Hsu
authors.forename: Chi-Chang
authors.initials: CC
authors.lastname: Huang
authors.forename: Chia-Chung
authors.initials: CC
authors.lastname: Hou
mesh_terms: D000596:Amino Acids / Q000378:metabolism; D000818:Animals; D002241:Carbohydrates / Q000032:analysis; D016002:Discriminant Analysis; D004734:Energy Metabolism; D005227:Fatty Acids / Q000378:metabolism; D008401:Gas Chromatography-Mass Spectrometry; D041981:Gastrointestinal Tract / Q000378:metabolism* / Q000382:microbiology*; D005856:Germ-Free Life; D005943:Gluconeogenesis; D006003:Glycogen / Q000378:metabolism*; D008099:Liver / Q000378:metabolism; D008297:Male; D055442:Metabolome; D055432:Metabolomics / Q000379:methods*; D054892:Metagenome; D051379:Mice; D008810:Mice, Inbred C57BL
chemical_list: D000596:Amino Acids; D002241:Carbohydrates; D005227:Fatty Acids; D006003:Glycogen