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Toll-like receptor 4 signalling is neither sufficient nor required for oxidised phospholipid mediated induction of interleukin-8 expression.

Abstract：

OBJECTIVE:Toll-like receptor (TLR)-4 signalling has been shown to accelerate atherosclerosis. As oxidised phospholipids are present in atherosclerotic plaque and have been shown to modulate TLR4 signalling, we investigated the role of oxidised 1-palmitoyl-2-arachidonyl-sn-glycero-3-phosphorylcholine (OxPAPC) in the regulation of TLR 1, 2, 4 and 6 signalling. METHODS AND RESULTS:Unlike established TLR agonists, OxPAPC did not induce NF-kappaB-dependent gene expression in monocytic THP-1 cells, human aortic endothelial cells or TLR-deficient HEK-293 cells transfected with TLRs 1, 2, 4 or 6. OxPAPC induction of IL-8 was not blocked by the TLR4 specific antagonist Rhodobacter sphaeroides LPS in human aortic endothelial cells, though OxPAPC potently inhibited TLR4 mediated IL-8 induction in these cells. OxPAPC upregulated IL-8 production in TLR4 deficient HEK-293 cells and this was not increased following TLR4 overexpression. Lipids extracted from carotid atherectomy samples did not stimulate TLR 1, 2, 4 or 6 signalling in a HEK-293 transfection assay. CONCLUSIONS:TLR4 signalling does not contribute to OxPAPC induced IL-8 expression in human epithelial HEK-293, monocytic THP-1 or aortic endothelial cells. As lipids extracted from diseased human artery also induced no TLR signalling, it is likely that the TLR-activating materials contributing to atherosclerosis are not of endogenous lipid origin.

journal_name

Atherosclerosis

journal_title

Atherosclerosis

authors

Erridge C,Webb DJ,Spickett CM

doi

10.1016/j.atherosclerosis.2006.08.032

subject

Has Abstract

pub_date

2007-07-01 00:00:00

pages

77-85

issue

1

eissn

0021-9150

issn

1879-1484

pii

S0021-9150(06)00492-8

journal_volume

193

pub_type

杂志文章

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