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Drug glucuronidation by human renal UDP-glucuronosyltransferases
K A McGurk1, C H Brierley, B Burchell
1Department of Molecular and Cellular Pathology, University of Dundee, Ninewells Hospital and Medical School, Scotland, UK. k.mcgurk@dundee.ac.uk
Biochemical Pharmacology
|May 30, 1998
Summary
Human kidney UDP-glucuronosyltransferase (UGT) activity, particularly for the anesthetic propofol, is higher than in the liver. This suggests specific UGT isoforms are key in renal drug metabolism.
Area of Science:
- Pharmacology
- Biochemistry
- Toxicology
Background:
- UDP-glucuronosyltransferases (UGTs) are crucial enzymes for drug and xenobiotic metabolism.
- Glucuronidation primarily occurs in the liver but also in extrahepatic tissues.
- The specific roles of renal UGTs in drug metabolism are not fully understood.
Purpose of the Study:
- To investigate the human renal UDP-glucuronosyltransferase system.
- To characterize the activity and expression of UGTs in the human kidney.
- To compare renal and hepatic UGT activity, particularly for propofol.
Main Methods:
- Enzymatic analysis of human kidney tissue.
- Immunoblot analysis of UGT protein expression.
- Assessment of UGT activity towards various drugs and xenobiotics, including propofol.
Main Results:
- A limited number of UGT isoforms are expressed in the human kidney.
- Renal UGT activity towards propofol was significantly higher than in the liver.
- UGT1A8/9 isoforms are implicated in the high renal glucuronidation of propofol.
- Human kidney demonstrated the capacity to conjugate diverse xenobiotics.
Conclusions:
- The human kidney possesses a distinct UDP-glucuronosyltransferase system.
- Renal UGTs play a significant role in the metabolism of certain drugs like propofol.
- Further research into renal UGTs is warranted for understanding drug disposition and potential toxicity.