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J. Biol. Chem., Vol. 276, Issue 31, 28857-28865, August 3, 2001
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§,
,
, and
From the The bile salt excretory pump (BSEP, ABCb11) is
critical for ATP-dependent transport of bile acids across
the hepatocyte canalicular membrane and for generation of bile
acid-dependent bile secretion. Recent studies have
demonstrated that the expression of this transporter is sensitive to
the flux of bile acids through the hepatocyte, possibly at the level of
transcription of the BSEP gene. To determine the mechanisms
underlying the regulation of BSEP by bile acids, the
promoter of the BSEP gene was cloned. The sequence of the promoter contained an inverted repeat (IR)-1 element (5'-GGGACA T
TGATCCT-3') at base pairs
Laboratory of Developmental and Molecular
Hepatology, Department of Pediatrics, The Mount Sinai Medical Center,
New York, New York 10029 and ¶ Howard Hughes Medical Institute and
Department of Pharmacology, University of Texas Southwestern Medical
Center, Dallas, Texas 75390
63/
50 consisting of two nuclear receptor
half-sites organized as an inverted repeat and separated by a single
nucleotide. This IR-1 element has been shown in several recent studies
to serve as a binding site for the farnesoid X receptor (FXR), a
nuclear receptor for bile acids. FXR activity requires
heterodimerization with RXR
, and when bound by bile acids, the
complex effectively regulates the transcription of several genes
involved in bile acid homeostasis. Gel mobility shift assays
demonstrated specific binding of FXR/RXR
heterodimers to the IR-1
element in the BSEP promoter. In HepG2 cells,
co-transfection of FXR and RXR
is required to attain full
transactivation of the BSEP promoter by bile acids. Two FXR
transactivation-deficient mutants (an AF-2 deletion and a W469A point
mutant) failed to transactivate, indicating that the effect of bile
acids is FXR-dependent. Further, mutational analysis
confirms that the FXR/RXR
heterodimer activates transcription
through the IR-1 site in the human BSEP promoter. These
results demonstrate a mechanism by which bile acids transcriptionally
regulate the activity of the bile salt excretory pump, a critical
component involved in the enterohepatic circulation of bile acids.
An Associate Investigator of the Howard Hughes Medical Institute.
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