RRC ID 44364
Author Arnal-Levron M, Chen Y, Delton-Vandenbroucke I, Luquain-Costaz C.
Title Bis(monoacylglycero)phosphate reduces oxysterol formation and apoptosis in macrophages exposed to oxidized LDL.
Journal Biochem. Pharmacol.
Abstract Atherosclerosis is a major cardiovascular complication of diseases associated with increased oxidative stress that favors oxidation of circulating low density lipoproteins (LDLs). Oxidized LDL (oxLDL) is considered as highly atherogenic as it induces a strong accumulation of cholesterol in subendothelial macrophages leading to the formation of foam cells and emergence of atherosclerotic plaque. OxLDL is enriched in oxidation products of cholesterol called oxysterols, some of which have been involved in the ability of oxLDL to induce cellular oxidative stress and cytotoxicity, mainly by apoptosis. Little is known about the possible contribution of cell-generated oxysterols toward LDL-associated oxysterols in cellular accumulation of oxysterols and related apoptosis. Using both radiochemical and mass analyzes, we showed that oxLDL greatly enhanced oxysterol production by RAW macrophages in comparison with unloaded cells or cells loaded with native LDL. Most oxysterols were produced by non-enzymatic routes (7-ketocholesterol and 7α/β-hydroyxycholesterol) but enzymatically formed 7α-, 25- and 27-hydroxycholesterol were also quantified. Bis(monoacylglycero)phosphate (BMP) is a unique phospholipid preferentially found in late endosomes. We and others have highlighted the role of BMP in the regulation of intracellular cholesterol metabolism/traffic in macrophages. We here report that cellular BMP accumulation was associated with a significantly lower production of oxysterols upon oxLDL exposure. Of note, potent pro-apoptotic 7-ketocholesterol was the most markedly decreased. OxLDL-induced cell cytotoxicity and apoptosis were consistently attenuated in BMP-enriched cells. Taken together, our data suggest that BMP exerts a protective action against the pro-apoptotic effect of oxLDL via a reduced production of intracellular pro-apoptotic oxysterols.
Volume 86(1)
Pages 115-21
Published 2013-7-1
DOI 10.1016/j.bcp.2013.03.017
PII S0006-2952(13)00217-7
PMID 23542536
MeSH Animals Apoptosis* Cell Line Humans Lipoproteins, LDL / metabolism* Lipoproteins, LDL / pharmacology Lysophospholipids / metabolism* Lysophospholipids / pharmacology Macrophages / cytology* Macrophages / drug effects Macrophages / metabolism* Mice Monoglycerides / metabolism* Monoglycerides / pharmacology Sterols / biosynthesis
IF 4.235
Times Cited 6
Human and Animal Cells