Identification of cyclosporine A and tacrolimus glucuronidation in human liver and the gastrointestinal tract by a differentially expressed UDP-glucuronosyltransferase: UGT2B7.

Abstract:

BACKGROUND/AIMS:The oral administration of the major transplant immunosuppressants cyclosporine A and tacrolimus leads to unpredictable drug levels requiring drug monitoring. Hepatic and extrahepatic metabolism of cyclosporine A and tacrolimus by cytochrome P450 proteins has been analyzed but metabolism and inactivation by glucuronidation has not been investigated. METHODS:Cyclosporine A and tacrolimus glucuronidation was measured in hepatic and gastrointestinal microsomal protein, and with 11 recombinant hepatic and extrahepatic family 1 and 2 UDP-glucuronosyltransferases. UDP-glucuronosyltransferase transcripts were determined by polymerase chain reaction. RESULTS:Significant cyclosporine and tacrolimus glucuronidation activity was present in endoplasmic reticulum from liver, duodenum, jejunum, ileum and colon, but was absent in stomach. Specific cyclosporine A glucuronidation activity was highest in liver and colon, tacrolimus glucuronidation was highest in liver. Analyses using recombinant UDPglucuronosyltransferases identified UGT2B7 as a human UDP-glucuronosyltransferase with specific activity toward cyclosporine A and tacrolimus. The hepato-gastrointestinal distribution of immunosuppressant glucuronidation activity corresponded to the differential expression pattern of UGT2B7 mRNA. CONCLUSIONS:This study provides conclusive evidence of hepatic and extrahepatic immunosuppressant glucuronidation by human UGT2B7 which was identified to be differentially expressed in the human hepatogastrointestinal tract. Hepatic and extrahepatic glucuronidation may influence the therapeutic efficacy of transplant immunosuppressants.

journal_name

J Hepatol

journal_title

Journal of hepatology

authors

Strassburg CP,Barut A,Obermayer-Straub P,Li Q,Nguyen N,Tukey RH,Manns MP

doi

10.1016/s0168-8278(01)00040-x

subject

Has Abstract

pub_date

2001-06-01 00:00:00

pages

865-72

issue

6

eissn

0168-8278

issn

1600-0641

pii

S016882780100040X

journal_volume

34

pub_type

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