title: Enterobacteria modulate intestinal bile acid transport and homeostasis through apical sodium-dependent bile acid transporter (SLC10A2) expression.
abstract: In our study, ampicillin (AMP)-mediated decrease of enterobacteria caused increases in hepatic bile acid concentration through (at least in part) elevation of bile acid synthesis in C57BL/6N mice. We investigated the involvement of enterobacteria on intestinal bile acid absorption in AMP-treated mice in the present study. Fecal enterobacterial levels and fecal bile acid excretion rates were markedly decreased in mice treated with AMP (100 mg/kg) for 3 days, whereas bile acid concentrations in portal blood were significantly increased compared with those in mice treated with a vehicle. Ileal apical sodium-dependent bile acid transporter (SLC10A2) mRNA levels and ileal SLC10A2 protein levels in brush-border membranes were significantly increased compared with those in mice treated with the vehicle. In AMP-treated mice, total bile acid levels were increased, whereas levels of enterobacteria-biotransformed bile acid, taurodeoxycholic acid, and cholic acid were decreased in intestinal lumen. These phenomena were also observed in farnesoid X receptor-null mice treated with AMP for 3 days. Discontinuation of AMP administration after 3 days (vehicle administration for 4 days) increased levels of fecal enterobacteria, fecal bile acid excretion, and taurodeoxycholic acid and cholic acid in the intestinal lumen, whereas the discontinuation decreased ileal SLC10A2 expression and bile acid concentrations in the portal blood. Coadministration of taurodeoxycholic acid or cholic acid decreased ileal SLC10A2 expression in mice treated with AMP. These results suggest that enterobacteria-mediated bile acid biotransformation modulates intestinal bile acid transport and homeostasis through down-regulation of ileal SLC10A2 expression.
authors.affiliation: Division of Drug Metabolism and Molecular Toxicology, Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3, Aoba, Aramaki, Aoba-ku, Sendai, 980-8578, Japan. miyata@mail.pharm.tohoku.ac.jp
authors.forename: Masaaki
authors.initials: M
authors.lastname: Miyata
authors.forename: Hiroki
authors.initials: H
authors.lastname: Yamakawa
authors.forename: Mayumi
authors.initials: M
authors.lastname: Hamatsu
authors.forename: Hideaki
authors.initials: H
authors.lastname: Kuribayashi
authors.forename: Yuki
authors.initials: Y
authors.lastname: Takamatsu
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Yamazoe
mesh_terms: D000667:Ampicillin / Q000494:pharmacology; D000818:Animals; D001647:Bile Acids and Salts / Q000378:metabolism*; D001692:Biological Transport / Q000187:drug effects / Q000502:physiology; D015536:Down-Regulation / Q000187:drug effects / Q000502:physiology*; D004755:Enterobacteriaceae / Q000187:drug effects / Q000502:physiology*; D006706:Homeostasis / Q000187:drug effects / Q000502:physiology*; D007082:Ileum / Q000378:metabolism*; D007413:Intestinal Mucosa / Q000378:metabolism; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D029363:Organic Anion Transporters, Sodium-Dependent / Q000096:biosynthesis*; D012964:Sodium / Q000378:metabolism*; D027981:Symporters / Q000096:biosynthesis*
chemical_list: D001647:Bile Acids and Salts; D029363:Organic Anion Transporters, Sodium-Dependent; D027981:Symporters; C071908:sodium-bile acid cotransporter; D000667:Ampicillin; D012964:Sodium