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J. Biol. Chem., Vol. 276, Issue 16, 12822-12826, April 20, 2001
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§,
¶,
,
**, and

From the The mechanisms by which different classes of
chemicals induce the same cytochrome P450 (CYP) or the same chemical
differentially induces more than one CYP are not well understood. We
show that in primary hepatocytes and in vivo in liver
(transfected by particle-mediated delivery) two orphan nuclear
receptors, constitutive androstane receptor and pregnane X
receptor (PXR1), transactivate a CYP gene via the same
response element in a xenobiotic-specific manner. The constitutive
androstane receptor mediates the barbiturate activation of expression
of CYP2B1 and CYP3A1. PXR1 activates both genes
in response to synthetic steroids. To exert their effect the receptors
bind to the same direct repeat site (DR4) within the phenobarbital
response element of the CYP2B1 promoter and to the same DR3
site in the pregnane X response element of CYP3A1. The
receptors are therefore promiscuous with respect to DNA binding but not
ligand binding. Differences in enhancer half-site spacing may influence
the efficiency of interactions between the receptor and the
transcription machinery and hence form the basis for the differential
induction of CYP2B1 and CYP3A1 in response to barbiturates and
synthetic steroids.
Department of Biochemistry and Molecular
Biology, University College London, Gower Street, London WC1E 6BT,
United Kingdom and the
School of Biological Sciences, Queen
Mary, University of London, Mile End Road, London E1 4NS, United
Kingdom

To whom correspondence may be addressed: Dept. of Biochemistry
and Molecular Biology, University College London, Gower Street, London
WC1E 6BT, UK. Tel.: +44-20-7679-2321; Fax: +44-20-7679-7193; E-mail:
e.shephard@ucl.ac.uk.
**
To whom correspondence may also be addressed: School of Biological
Sciences, Queen Mary, University of London, Mile End Rd., London
E1 4NS, UK. Tel.: +44-20-7882-6338; Fax: +44-20-8983-0531; E-mail:
I.R.Phillips@qmw.ac.uk.
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