NDLI: Lipopolysaccharide Down Regulates Both Scavenger Receptor B1 and ATP Binding Cassette Transporter A1 in RAW Cells

Content Provider	PubMed Central
Author	Baranova, Irina Vishnyakova, Tatyana Bocharov, Alexander Chen, Zhigang Remaley, Alan T. John, Stonik Eggerman, Thomas L. Patterson, Amy P.
Copyright Year	2002
Abstract	Lipopolysaccharide (LPS) has recently been shown to facilitate macrophage foam cell formation and has been suggested to be a proatherogenic factor. The mechanism of LPS induced cholesterol accumulation, however, is unclear. In this report, using the macrophage-like RAW 264.7 cell line, we provide experimental evidence that LPS's proatherogenic effects may at least in part reflect altered cholesterol metabolism. Data presented demonstrate that in a dose-dependent manner, LPS is able to down regulate the mRNA expression of the two primary high-density lipoprotein (HDL) receptors, scavenger receptor B1 (SR-B1) and ATP binding cassette A1 (ABCA1), with a 50% inhibitory concentration of less than 0.2 ng/ml, as well as to decrease SR-B1 protein expression by 80%. We also found that LPS treatment resulted in a significant decrease (to 20% of the control level) of the specific 125I-HDL binding as well as in 50% inhibition of the HDL-mediated cholesterol efflux compared to untreated cells. In addition, we compared the potencies of various modified LPS preparations and demonstrated that the phosphorylated lipid A portion of LPS, which is highly conserved among gram-negative microorganisms, including Chlamydia, is primarily responsible for the effects of LPS on SR-B1 and ABCA1 expression. Inhibitors of NF-κB activation were observed to efficiently block the suppressive effect of LPS on SR-B1 and ABCA1, suggesting a mechanism involving NF-κB. These data indicate that the LPS effects on cholesterol metabolism may contribute to the proatherogenic properties of LPS.
Related Links	http://dx.doi.org/10.1128/iai.70.6.2995-3003.2002
Ending Page	3003
Page Count	9
Starting Page	2995
File Format	PDF
ISSN	00199567
e-ISSN	10985522
Journal	Infection and Immunity
Issue Number	6
Volume Number	70
Language	English
Publisher	American Society for Microbiology
Publisher Date	2002-06-01
Access Restriction	Open
Rights Holder	American Society for Microbiology
Subject Keyword	Immunology Microbiology Parasitology Infectious Diseases Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Infectious Diseases Parasitology Immunology Microbiology

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