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- W2020094470 abstract "Monocyte-to-macrophage differentiation and LDL oxidation play a pivotal role in early atherogenesis. We thus questioned possible mechanisms for oxidized LDL (Ox-LDL)-induced monocyte-to-macrophage differentiation in vivo. Mouse peritoneal mononuclear cells, that were isolated 1, 2, or 3 days after Ox-LDL intraperitoneal injection, gradually exhibited the characteristic macrophage morphology, along with the expression of the cell-surface antigen CD11b. Molecular mechanisms involved in Ox-LDL-induced differentiation were further investigated in vitro using the THP-1 monocytic cell line. THP-1 cells incubated with Ox-LDL in the presence of as low as 1 ng/ml of PMA differentiated into macrophages, as evidenced by morphologic, phenotypic, and functional properties. Stimulation of monocyte-to-macrophage differentiation was selective to Ox-LDL (and not native LDL), was dependent on the extent of LDL oxidation, and required Ox-LDL internalization by the cells. These effects of Ox-LDL could be attributed to its major oxysterols, 7-ketocholesterol and 7beta-hydroxycholesterol. Finally, the stimulation of monocyte differentiation to macrophages by Ox-LDL was shown to require the M-CSF-receptor, since blocking the binding to the receptor abolished Ox-LDL/7beta-hydroxycholesterol-induced differentiation. Furthermore, Ox-LDL/7beta-hydroxycholesterol elicited tyrosine phosphorylation and activation of the M-CSF-R. We thus conclude that Ox-LDL induces monocyte differentiation to macrophages in vivo and this phenomenon involves activation of the M-CSF-receptor." @default.
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- W2020094470 date "2008-02-01" @default.
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- W2020094470 title "Ox-LDL induces monocyte-to-macrophage differentiation in vivo: Possible role for the macrophage colony stimulating factor receptor (M-CSF-R)" @default.
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- W2020094470 doi "https://doi.org/10.1016/j.atherosclerosis.2007.06.026" @default.
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