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• W2894814129 abstract "Background and aims Although studies in mice have suggested that lesion regression is feasible, the underlying mechanisms remain largely unknown. Here we determined the impact of high-density lipoprotein (HDL) on atherosclerosis regression outcome. Methods Atherosclerotic lesion dynamics were studied upon bone marrow transplantation-mediated re-introduction of apolipoprotein E (Apoe) in Apoe knockout mice. Probucol was used to pharmacologically deplete HDL. Results Restoration of Apoe function was associated with an initial growth of atherosclerotic lesions and parallel decrease in lesional macrophage foam cell content (47 ± 4% at 4 weeks versus 72 ± 2% at baseline: p < 0.001), despite the fact that cholesterol levels were markedly reduced. Notably, significant lesion regression was detected from 4 weeks onwards, when plasma cholesterol levels had returned to the normolipidemic range. As a result, lesions were 41% smaller (p < 0.05) at 8 weeks than at 4 weeks after bone marrow transplantation. Regressed lesions contained an even lower level of macrophage foam cells (33 ± 5%: p < 0.001) and were rich in collagen. Probucol co-treatment was associated with a 3.2-fold lower (p < 0.05) plasma HDL-cholesterol level and a more pro-inflammatory (CCR2+) monocyte phenotype. Importantly, probucol-treated mice exhibited atherosclerotic lesions that were larger than those of regular chow diet-fed bone marrow transplanted mice at 8 weeks (186 ± 15*103 μm2 for probucol-treated versus 120 ± 19*103 μm2 for controls: p < 0.05). Conclusions We have shown that probucol-induced HDL deficiency impairs the ability of established lesions to regress in response to reversal of the genetic hypercholesterolemia in Apoe knockout mice. Our studies thus highlight a crucial role for HDL in the process of atherosclerosis regression." @default.
• W2894814129 created "2018-10-12" @default.
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• W2894814129 date "2018-11-01" @default.
• W2894814129 modified "2023-10-16" @default.
• W2894814129 title "HDL is essential for atherosclerotic lesion regression in Apoe knockout mice by bone marrow Apoe reconstitution" @default.
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• W2894814129 doi "https://doi.org/10.1016/j.atherosclerosis.2018.09.038" @default.
• W2894814129 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30340108" @default.
• W2894814129 hasPublicationYear "2018" @default.
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