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The activities of UDP-glucuronyl transferase(s) in homogenates and microsomal preparations of human liver, kidney and intestine were tested with hyodeoxycholic acid (HDC). The various kinetic parameters of the UDC-glucuronidation were determined from time course experiments. In both liver and kidney preparations, HDC underwent a very active metabolic transformation: liver Km = 78 microM, Vmax = 3.3 nmol . min-1 . mg-1 protein; kidney Km = 186 microM, Vmax = 9.9 nmol . min-1 . mg-1 protein. To our knowledge this is the first observation of both an extensive and comparable bile acid glucuronidation occurring in renal and hepatic tissues.
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