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J. Biol. Chem., Vol. 277, Issue 30, 26821-26830, July 26, 2002
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through an Intronic
Response Element Functionally Conserved between Humans and Rodents*
,
,
From the Department of Biochemistry and Molecular Biology,
University of Southern Denmark, 5230 Odense M, Denmark, the
The acyl-CoA-binding protein (ACBP) is a 10-kDa
intracellular protein that specifically binds acyl-CoA esters with high
affinity and is structurally and functionally conserved from yeast to
mammals. In vitro studies indicate that ACBP may regulate
the availability of acyl-CoA esters for various metabolic and
regulatory purposes. The protein is particularly abundant in cells with
a high level of lipogenesis and de novo fatty acid
synthesis and is significantly induced during adipocyte
differentiation. However, the molecular mechanisms underlying the
regulation of ACBP expression in mammalian cells have remained largely
unknown. Here we report that ACBP is a novel peroxisome
proliferator-activated receptor (PPAR)
Department of Molecular Biology, Nijmegen Center for
Molecular Life Sciences, 6525 GA Nijmegen, The Netherlands, and
§ Novo,
Nordisk A/S, 2880 Bagsv
rd, Denmark
target gene. The rat ACBP
gene is directly activated by PPAR
/retinoid X receptor
(RXR
)
and PPAR
/RXR
, but not by PPAR
/RXR
, through a PPAR-response
element in intron 1, which is functionally conserved in the human ACBP
gene. The intronic PPAR-response element (PPRE) mediates induction by
endogenous PPAR
in murine adipocytes and confers responsiveness to
the PPAR
-selective ligand BRL49653. Finally, we have used chromatin
immunoprecipitation to demonstrate that the intronic PPRE efficiently
binds PPAR
/RXR in its natural chromatin context in adipocytes. Thus,
the PPRE in intron 1 of the ACBP gene is a bona fide
PPAR
-response element.
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