Effect of different modifications of a semi synthetic diet on bile acid metabolism in axenic and holoxenic rats

Sacquet, E.; Leprince, C.; Riottot, M.

Annales de Biologie Animale Biochimie Biophysique 19(6): 1677-1688


ISSN/ISBN: 0003-388X
Accession: 005233773

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Axenic (germfree) and holoxenic (conventional) rats were fed diets which were different as to the mode of sterilization (autoclaving or .gamma.-irradiation) and the absence or presence of 10% lactose added before sterilization. The autoclaved diet was offered to the rats in the form of pellets and the irradiated diet in the form of a paste. Important changes in bile acid metabolism were induced by these dietary modifications. The bile acid intestinal pools were larger in the rats fed the irradiated diet than in those fed the autoclaved one. They were unmodified by the addition of lactose when the diet was irradiated but increased when it was autoclaved. The variations were observed in axenic and holoxenic rats and are considered as not mediated by the intestinal bacterial flora. Bile acid fecal excretions varied conversely to the pools. In axenic rats the percentage of cholic acid decreased when the bile acid pool increased. In holoxenic rats the bacterial transformation of bile acids was lower with the irradiated diet than with the autoclaved diet, and with the lactose-containing diet than with the lactose-free one. The formation of .omega.-muricholic acid at the expense of hyodeoxycholic acid increased when the bacterial transformation of bile acids decreased. Hypotheses are proposed to explain these variations in bile acid metabolism induced by the diet.