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J. Biol. Chem., Vol. 277, Issue 46, 44147-44154, November 15, 2002
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From the Pro-inflammatory pathways participate in the
pathogenesis of atherosclerosis. However, the role of endogenous
anti-inflammatory pathways in atheroma has received much less
attention. Therefore, using cDNA microarrays, we screened for genes
regulated by prostaglandin E2 (PGE2), a
potential endogenous anti-inflammatory mediator, in lipopolysaccharide
(LPS)-treated human macrophages (M
Prostaglandin E2 Suppresses Chemokine Production in
Human Macrophages through the EP4 Receptor*
,
,
§¶
Leducq Center for Cardiovascular Research,
Department of Medicine, and the § Center for Excellence in
Vascular Biology, Department of Pathology, Brigham and Women's
Hospital, Harvard Medical School, Boston, Massachusetts 02115
). PGE2 (50 nM) attenuated LPS-induced mRNA and protein expression
of chemokines including monocyte chemoattractant protein-1,
interleukin-8, macrophage inflammatory protein-1
and -1
, and
interferon-inducible protein-10. PGE2 also inhibited the
tumor necrosis factor-
-, interferon-
-, and
interleukin-1
-mediated expression of these chemokines. In contrast
to the case of M
, PGE2 did not suppress chemokine
expression in human endothelial and smooth muscle cells (SMC) treated
with LPS and pro-inflammatory cytokines. To assess the potential
paracrine effect of endogenous PGE2 on macrophage-derived chemokine production, we co-cultured M
with SMC in the presence of
LPS. In these co-cultures, cyclooxygenase-2-dependent
PGE2 production exceeded that in the mono-cultures, and
MIP-1
declined significantly compared with M
cultured without
SMC. We further documented prominent expression of the PGE2
receptor EP4 in M
in both culture and human atheroma. Moreover, a
selective EP4 antagonist completely reversed PGE2-mediated
suppression of chemokine production. Thus, endogenous PGE2
may modulate inflammation during atherogenesis and other
inflammatory diseases by suppressing macrophage-derived chemokine
production via the EP4 receptor.
*
This work was supported by the Leducq Foundation and by
National Institutes of Health NHLBI Grant HL-34636 (to P. L.).
This work was presented in part at the Scientific Sessions of the
American Heart Association, Anaheim, CA, November 11-14, 2001, and
published in abstract form (Circulation (2001)
17, II-318).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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