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J. Biol. Chem., Vol. 275, Issue 46, 36164-36171, November 17, 2000
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From the UDP-glucuronosyltransferases (UGTs) convert
dietary constituents, drugs, and environmental mutagens to inactive
hydrophilic glucuronides. Recent studies have shown that the expression
of the UGT1 and UGT2 gene families is regulated
in a tissue-specific fashion. Human small intestine represents a major
site of resorption of dietary constituents and orally administered
drugs and plays an important role in extrahepatic UGT directed
metabolism. Expression of 13 UGT1A and UGT2B
genes coupled with functional and catalytic analyses were studied using
18 small intestinal and 16 hepatic human tissue samples. Hepatic
expression of UGT gene transcripts was without
interindividual variation. In contrast, a polymorphic expression
pattern of all the UGT genes was demonstrated in duodenal, jejunal, and ileal mucosa, with the exception of UGT1A10.
To complement these studies, interindividual expression of UGT proteins
and catalytic activities were also demonstrated. Hyodeoxycholic acid glucuronidation, catalyzed primarily by UGT2B4 and UGT2B7, showed a
7-fold interindividual variation in small intestinal duodenal samples,
in contrast to limited variation in the presence of
4-methylumbelliferone, a substrate glucuronidated by most
UGT1A and UGT2B gene products. Linkage of RNA
expression patterns to protein abundance were also made with several
mono-specific antibodies to the UGTs. These results are in contrast to
a total absence of polymorphic variation in gene expression, protein
abundance, and catalytic activity in liver. In addition, the small
intestine exhibits considerable catalytic activity toward most of the
different classes of substrates accepted for glucuronidation by the
UGTs, which is supported by immunofluorescence analysis of UGT1A
protein in the mucosal cell layer of the small intestine. Thus,
tissue-specific and interindividual polymorphic regulation of
UGT1A and UGT2B genes in small intestine is
identified and implicated as molecular biological determinant contributing to interindividual prehepatic drug and xenobiotic metabolism in humans.
Polymorphic Gene Regulation and Interindividual Variation of
UDP-glucuronosyltransferase Activity in Human Small Intestine*
§,
,
,
,
,
Department of Gastroenterology and
Hepatology, Hannover Medical School, 30625 Hannover, Germany and the
¶ Departments of Chemistry & Biochemistry and Pharmacology,
University of California, San Diego, La Jolla, California 92093
*
This work was supported by Deutsche Forschungsgemeinschaft
Grant STR493/3-1 (to C. P. S.) and United States Public
Health Service Grant GM49135 (to R. H. T).The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
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