Upstream stimulatory factor 1 (USF1) suppresses induction of CYP1A1 mRNA by 3-methylcholanthrene (MC) in HepG2 cells.

Abstract:

:In this study, an endogenous factor(s) involved in the suppression of the induction of CYP1A1 was studied. Analyzing the sequences, we found that the sequence of xenobiotic responsive element (XRE) in the upstream region of the human CYP1A1 gene was overlapped with that of the upstream stimulatory factor 1 (USF1)-binding site in mouse metallothionein I promoter. In fact, a gel shift assay using a specific competitor or mutant probes showed that the core sequence of human XRE was specifically recognized by USF1. The amount of USF1 in the nuclear extracts from HepG2 cells was smaller than that from rat and rabbit livers as assayed by the binding to XRE. To determine whether or not USF1 could inhibit the interaction of aryl hydrocarbon receptor (AhR)/AhR nuclear translocator (Arnt) complex with XRE, we transfected USF1-SR alpha expression vector into HepG2 cells. The results showed that no interaction of AhR/Arnt complex with XRE occurred even when the cells were treated with 2,3,7,8-tetrachlorodibenzofuran (TCDF). Furthermore, the S1 nuclease protection assay showed that the induction of CYP1A1 mRNA by 3-methylcholanthrene (MC) was depressed by the transfection of USF1-SR alpha into HepG2 cells. Thus, it is highly possible that USF1 negatively regulates the induction of CYP1A1 in humans.

authors

Takahashi Y,Nakayama K,Itoh S,Kamataki T

doi

10.1006/bbrc.1997.7651

subject

Has Abstract

pub_date

1997-11-17 00:00:00

pages

293-7

issue

2

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(97)97651-8

journal_volume

240

pub_type

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