Atherosclerotic lesion development and Toll like receptor 2 and 4 responsiveness.

Abstract:

BACKGROUND:Toll like receptors (TLR) have been recognized for their role in atherosclerotic lesion development and progression. Endogenous TLR ligands that are also expressed in atherosclerotic tissues have been shown to promote atherosclerosis in mice. Since repetitive stimulation of TLR induces an attenuated inflammatory response, we hypothesized that the TLR response is altered during atherosclerosis development, due to chronic exposure to endogenous ligands. METHODS AND RESULTS:We examined five groups of both ApoE-/- and C57Bl/6 mice aged 5, 10, 15, 25 and 40 weeks. In ApoE-/- mice with advanced stages of atherosclerosis, levels of mRNA encoding TLR2 and TLR4, the endogenous TLR ligands EDA and hsp60 as well as intracellular TLR-regulating mediators, like IRAK-M, were increased. Systemic TLR cell surface expression on circulating monocytes and EDA plasma levels were significantly increased in ApoE-/- mice with advanced atherosclerosis. We also observed that the endogenous TLR ligand EDA was capable of activating the TLR-signaling pathway in white blood cells. During the plaque progression stage however, stimulation of TLR2 and TLR4 in blood samples attenuated MIP-1 alpha and RANTES release in atherosclerotic mice. CONCLUSION:During atherosclerotic lesion development, TLR2 and TLR4 expression increases in atherosclerotic plaques and on circulating blood cells. However, with advanced stages of atherosclerotic disease, circulating blood cells become less responsive to TLR ligation, which may be due to chronic TLR engagement by endogenous EDA.

journal_name

Atherosclerosis

journal_title

Atherosclerosis

authors

Schoneveld AH,Hoefer I,Sluijter JP,Laman JD,de Kleijn DP,Pasterkamp G

doi

10.1016/j.atherosclerosis.2007.08.004

subject

Has Abstract

pub_date

2008-03-01 00:00:00

pages

95-104

issue

1

eissn

0021-9150

issn

1879-1484

pii

S0021-9150(07)00493-5

journal_volume

197

pub_type

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