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(Received for publication, June 6, 1997, and in revised form, August 12, 1997)
From the Division of Drug Metabolism, Faculty of Pharmaceutical
Sciences, Hokkaido University, N12W6, Kita-ku, Sapporo,
Hokkaido 060, Japan
A xenobiotic-responsive element (XRE)-binding
factor(s) other than the AhR·Arnt complex was found to inhibit the
transcription of CYP1A1 gene in the liver from adult
rabbits, known to be nonresponsive to CYP1A1 inducers. The constitutive
factor(s) in liver nuclear extracts bound to the core sequence of XRE.
The binding was eliminated by the presence of an excess amount of the
AhR·Arnt complex synthesized in vitro. To identify the
constitutive factor(s), a sequence similar to rabbit XRE was sought. It
was found that the sequence of rabbit XRE overlapped with that of the
upstream stimulatory factor 1 (USF1)-binding site in the mouse
metallothionein I promoter. In fact, a super shift assay using a
specific antibody against human USF1 indicated that USF1 was capable of
binding to rabbit XRE. Additionally, the AhR·Arnt-mediated activation
of XRE-TK/Luc reporter gene in RK13 cells was blocked by the
transfection with a USF1 expression vector with the amounts of the
expression vector transfected. These results indicate that the XRE of
the rabbit CYP1A1 gene is recognized by the basic
helix-loop-helix proteins to regulate the expression of
CYP1A1 in both an agonistic (AhR·Arnt) and an antagonistic (USF1) manner.
Volume 272, Number 48,
Issue of November 28, 1997
pp. 30025-30031
©1997 by The American Society for Biochemistry and Molecular Biology, Inc.
Inhibition of the Transcription of CYP1A1 Gene by the
Upstream Stimulatory Factor 1 in Rabbits
COMPETITIVE BINDING OF USF1 WITH AhR·Arnt COMPLEX
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