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• W2132120180 abstract "Probucol is a potent inhibitor of atherosclerosis in animal models. However, the mechanism of its antiatherogenic effect is not known. To investigate the effects of probucol on gene expression of VCAM-1, MCP-1, and M-CSF in vivo during the early stages of atherogenesis, we determined gene expression in 12 control WHHL rabbits and 12 WHHL rabbits fed 1% probucol from age 3 weeks. Three animals from each group were killed at 6, 9, 12, and 18 weeks of age. Two intimal/medial segments of the thoracic aorta, each comprising the orifices of a pair of intercostal arteries, were analyzed by semiquantitative RT-PCR using GAPDH as an internal standard. A third segment located between these two segments was studied by immunocytochemistry. A basal level of VCAM-1 gene expression was observed in lesion-free aortas of both treated and untreated WHHL rabbits (and in normal NZW aortas). Immunocytochemistry showed some VCAM-1 protein in normal arteries and confirmed that VCAM-1 protein expression generally correlated with gene expression. In the untreated WHHL rabbits, a marked upregulation of VCAM-1 expression was observed at 18 weeks. To correlate gene expression with intimal monocyte/macrophages in each animal, the macrophage area was determined by morphometry of immunostained sections. In addition, a scoring system of lesions was used. VCAM-1 expression showed a highly significant correlation with the extent of intimal macrophage presence (P < .001). A lesser degree of correlation between gene expression and macrophage accumulation was also seen for MCP-1. In contrast, M-CSF expression remained constant over the entire study period and showed no correlation with the intimal macrophage accumulation. Probucol treatment completely prevented lesion formation in all animals up to 18 weeks of age. Probucol reduced the level of basal VCAM-1 expression and prevented its upregulation. MCP-1 expression was not affected by probucol treatment, whereas M-CSF expression was significantly lowered by probucol. Our results support the idea that VCAM-1 plays an important role in early atherogenesis and suggest that the antiatherogenic effect of probucol may in part be due to a downregulation of VCAM-1. Reduction of the basal level of M-CSF gene expression by probucol treatment may also contribute to its ability to inhibit atherogenesis." @default.
• W2132120180 created "2016-06-24" @default.
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• W2132120180 date "1997-07-01" @default.
• W2132120180 modified "2023-10-10" @default.
• W2132120180 title "Effect of Probucol Treatment on Gene Expression of VCAM-1, MCP-1, and M-CSF in the Aortic Wall of LDL Receptor–Deficient Rabbits During Early Atherogenesis" @default.
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• W2132120180 doi "https://doi.org/10.1161/01.atv.17.7.1289" @default.
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• W2132120180 hasPublicationYear "1997" @default.
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