Dysfunction of Organic Anion Transporting Polypeptide 1a1 Alters Intestinal Bacteria and Bile Acid Metabolism in MiceReportar como inadecuado




Dysfunction of Organic Anion Transporting Polypeptide 1a1 Alters Intestinal Bacteria and Bile Acid Metabolism in Mice - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Organic anion transporting polypeptide 1a1 Oatp1a1 is predominantly expressed in liver and is able to transport bile acids BAs in vitro. Male Oatp1a1-null mice have increased concentrations of taurodeoxycholic acid TDCA, a secondary BA generated by intestinal bacteria, in both serum and livers. Therefore, in the present study, BA concentrations and intestinal bacteria in wild-type WT and Oatp1a1-null mice were quantified to investigate whether the increase of secondary BAs in Oatp1a1-null mice is due to alterations in intestinal bacteria. The data demonstrate that Oatp1a1-null mice : 1 have similar bile flow and BA concentrations in bile as WT mice; 2 have a markedly different BA composition in the intestinal contents, with a decrease in conjugated BAs and an increase in unconjugated BAs; 3 have BAs in the feces that are more deconjugated, desulfated, 7-dehydroxylated, 3-epimerized, and oxidized, but less 7-epimerized; 4 have 10-fold more bacteria in the small intestine, and 2-fold more bacteria in the large intestine which is majorly due to a 200% increase in Bacteroides and a 30% reduction in Firmicutes; and 5 have a different urinary excretion of bacteria-related metabolites than WT mice. In conclusion, the present study for the first time established that lack of a liver transporter Oatp1a1 markedly alters the intestinal environment in mice, namely the bacteria composition.



Autor: Youcai Zhang, Pallavi B. Limaye, Lois D. Lehman-McKeeman, Curtis D. Klaassen

Fuente: http://plos.srce.hr/



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