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Individual metabolic capacity evaluation of cytochrome P450 2C19 by protein and activity in the small intestinal mucosa of Japanese pancreatoduodenectomy patients.

Abstract：

:Some P450 enzymes are expressed not only in the liver but also in the small intestine, and these enzymes play an important role in first-pass drug metabolism in the small intestine. Cytochrome P450 (CYP)2C19 has been confirmed to exist in the small intestine of white people, but not yet in Japanese. We investigated the mRNA level, protein level, and activity of CYP2C19 in the small intestine in a Japanese population. Samples were obtained from the healthy portions of resected small intestines from 18 patients who had undergone pancreatoduodenectomy. The microsomes were extracted from the epithelium of the small intestinal tissues. CYP2C19 mRNA and protein levels were analyzed using real-time reverse transcription-polymerase chain reaction (RT-PCR) and Western blotting. CYP2C19 activity in the microsomes was evaluated based on the 5-hydroxylation of lansoprazole using HPLC. CYP2C19 mRNA and protein levels and activities in the small intestine showed interindividual differences. CYP2C19 mRNA levels were not correlated with protein levels or its activity. On the other hand, there was significant correlation between CYP2C19 protein levels and its activity. Further, CYP2C19 protein levels and activities in the small intestine were approximately equal to those in liver. These results suggest the metabolic capacity of CYP2C19 in Japanese small intestine may play as important a role as the liver in drug metabolism. Analyses of the protein level or protein activity of CYP2C19 rather than its mRNA level should be required for predicting the individual metabolic capacity of CYP2C19 in the small intestine.

journal_name

Biol Pharm Bull

journal_title

Biological & pharmaceutical bulletin

authors

Hayashi M,Matsumoto N,Takenoshita-Nakaya S,Takeba Y,Watanabe M,Kumai T,Takagi M,Tanaka M,Otsubo T,Kobayashi S

doi

10.1248/bpb.34.71

subject

Has Abstract

pub_date

2011-01-01 00:00:00

pages

71-6

issue

eissn

0918-6158

issn

1347-5215

pii

JST.JSTAGE/bpb/34.71

journal_volume

pub_type

杂志文章

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Individual metabolic capacity evaluation of cytochrome P450 2C19 by protein and activity in the small intestinal mucosa of Japanese pancreatoduodenectomy patients.