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Drug Metabolism and Disposition Fast Forward
First published on January 31, 2008; DOI: 10.1124/dmd.107.019406

0090-9556/08/3605-824-830$20.00
DMD 36:824-830, 2008

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Glucuronidation of Tobacco-Specific Nitrosamines by UGT2B10

Gang Chen, Ryan W. Dellinger, Dongxiao Sun, Thomas E. Spratt, and Philip Lazarus

Cancer Prevention and Control (G.C., P.L.) and Chemical Carcinogenesis (T.E.S.) Programs, Penn State Cancer Institute, Hershey, Pennsylvania; and Departments of Public Health Sciences (G.C., P.L.), Pharmacology (R.W.D., D.S., P.L.), and Biochemistry and Molecular Biology (T.E.S.), Penn State University College of Medicine, Hershey, Pennsylvania

4-(Methylnitrosamino)-1-(3-pyridyl)-1-butanol (NNAL) is an important tobacco-specific nitrosamine (TSNA) in the etiology of tobacco-related cancers, and N-glucuronidation is an important mechanism of NNAL detoxification. In the present study, an analysis of the UDP-glucuronosyltransferases (UGTs) responsible for the N-glucuronidation of the TSNAs N'-nitrosonornicotine, N'-nitrosoanabasine, and N'-nitrosoanatabine was performed. Using human embryonic kidney 293 cells overexpressing UGT1A1, UGT1A3, UGT1A4, UGT1A6, UGT1A7, UGT1A8, UGT1A9, UGT1A10, UGT2B4, UGT2B7, UGT2B10, UGT2B11, UGT2B15, and UGT2B17, only UGT1A4 and UGT2B10 exhibited N-glucuronidating activity against these TSNAs. The KMs for UGT2B10 were 15 to 22-fold lower than those of UGT1A4 against the three TSNAs and were similar to those observed for microsomes prepared from human liver specimens. The overall activity of UGT2B10 was 3.6 to 27-fold higher than UGT1A4 against the three TSNAs as determined by Vmax/KM after normalization by levels of UGT2B10 versus UGT1A4 mRNA. Similarly high levels of activity were also observed for UGT2B10 against a fourth TSNA, NNAL, exhibiting a 6.3-fold lower KM and 3-fold higher normalized Vmax/KM than that observed for UGT1A4. Real-time polymerase chain reaction analysis showed that UGT2B10 was expressed at a level that, on average, was 26% higher than that observed for UGT1A4 in a screening of normal liver tissue specimens from 20 individual subjects. These data suggest that UGT2B10 is likely the most active UGT isoform in human liver for the N-glucuronidation of TSNAs.

Address correspondence to: Philip Lazarus, Penn State Cancer Institute, Penn State University College of Medicine, Room C3739D, MC-H069, 500 University Drive, Hershey, PA 17033. E-mail: plazarus{at}psu.edu




This article has been cited by other articles:


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J. E. Muscat, G. Chen, A. Knipe, S. D. Stellman, P. Lazarus, and J. P. Richie Jr.
Effects of Menthol on Tobacco Smoke Exposure, Nicotine Dependence, and NNAL Glucuronidation
Cancer Epidemiol. Biomarkers Prev., January 1, 2009; 18(1): 35 - 41.
[Abstract] [Full Text] [PDF]


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