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J. Biol. Chem., Vol. 276, Issue 19, 16015-16023, May 11, 2001
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From the Departments of Synthetic high affinity peroxisome
proliferator-activated receptor (PPAR) agonists are known, but biologic
ligands are of low affinity. Oxidized low density lipoprotein (oxLDL)
is inflammatory and signals through PPARs. We showed, by phospholipase
A1 digestion, that PPAR
Oxidized Alkyl Phospholipids Are Specific, High Affinity
Peroxisome Proliferator-activated Receptor
Ligands and
Agonists*
§,
,
,
,
,
,
§§,
, and
¶
¶¶
Pathology,
Internal
Medicine, and 
Medicinal Chemistry, the
¶ Program in Human Molecular Biology and Genetics, the
§§ Huntsman Cancer Institute, University of Utah,
Salt Lake City, Utah 84112 and the ** Department of
Pediatrics, National Jewish Medical and Research Center,
Denver, Colorado 80206
agonists in oxLDL arise
from the small pool of alkyl phosphatidylcholines in LDL. We identified
an abundant oxidatively fragmented alkyl phospholipid in oxLDL,
hexadecyl azelaoyl phosphatidylcholine (azPC), as a high affinity
ligand and agonist for PPAR
. [3H]azPC bound
recombinant PPAR
with an affinity
(Kd(app)
40 nM) that was
equivalent to rosiglitazone (BRL49653), and competition with
rosiglitazone showed that binding occurred in the ligand-binding pocket. azPC induced PPRE reporter gene expression, as did
rosiglitazone, with a half-maximal effect at 100 nM.
Overexpression of PPAR
or PPAR
revealed that azPC was a specific
PPAR
agonist. The scavenger receptor CD36 is encoded by a
PPRE-responsive gene, and azPC enhanced expression of CD36 in primary
human monocytes. We found that anti-CD36 inhibited azPC uptake, and it
inhibited PPRE reporter induction. Results with a small molecule
phospholipid flippase mimetic suggest azPC acts intracellularly and
that cellular azPC accumulation was efficient. Thus, certain alkyl
phospholipid oxidation products in oxLDL are specific, high affinity
extracellular ligands and agonists for PPAR
that induce
PPAR-responsive genes.
*
This work was supported by National Institutes of Health
Grants HL44513, HL 35217, HL34303, NS29632, and HL 44525, the Utah Centers of Excellence Program, and the Margolis Foundation.The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in
accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
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