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J. Biol. Chem., Vol. 276, Issue 5, 3597-3603, February 2, 2001
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,
¶
From the Previous studies demonstrate that the mouse
renin gene is regulated by a complex enhancer of
transcription located 2.6 kilobases upstream of the transcription start
site which is under both positive and negative influence. We
demonstrate herein that a positive regulatory element (Eb) is repeated
10 bp upstream (Ec), and both are required for baseline activity of the
enhancer. The Eb and Ec core sequences are identical to the consensus
sequence for the nuclear hormone receptor superfamily of transcription
factors, and transcriptional activity of constructs containing the
enhancer is increased after treatment with retinoic acid. Maximal
induction requires both Eb and Ec. Expression of endogenous
renin and a renin-promoter controlled transgene
in As4.1 cells, and kidney renin mRNA in C57BL/6J mice
was induced after retinoid treatment. Gel mobility supershift analysis
revealed the binding of RAR
Departments of Internal Medicine and
Physiology & Biophysics, The University of Iowa College of Medicine,
Iowa City, Iowa 52242 and the § Department of Molecular and
Cellular Biology, Roswell Park Cancer Institute,
Buffalo, New York 14263
and RXR
to oligonucleotides
containing both Eb and Ec. Reverse transcriptase-polymerase chain
reaction analysis revealed that As4.1 cells express both receptor
isoforms, along with RAR
, but do not express RAR
, RXR
, or
RXR
. Co-transfection of an expression vector encoding wild-type
RAR
increased enhancer activity, whereas a dominant negative mutant
of RAR
significantly attenuated retinoic acid-induced activity of
the enhancer. These results demonstrate the importance of the Eb and Ec
motifs in controlling baseline activity of the renin
enhancer, and suggest the potential importance of retinoids in
regulating renin expression.
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