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Glucuronidation of 7-hydroxy-4-methylcoumarin by microsomes from normal and diseased human livers.

Glucuronidation of 7-hydroxy-4-methylcoumarin (7-H-4-MC) by microsomal UDP-glucuronosyltransferases from 12 human liver biopsy samples was studied. Glucuronidation rates were highest for livers with mild cholestasis while those for livers with mild fatty changes were similar to normal livers. The lowest rates were exhibited by livers showing primary or metastatic carcinoma on histological examination. Thus, glucuronidation of not only bile acids but also of other substrates such as 7-H-4-MC may be elevated in cholestasis. These results are also consistent with other studies stating that glucuronidation might be spared in certain mild hepatic diseases.