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Oxysterols in Vascular Cells and Role in Atherosclerosis

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Implication of Oxysterols and Phytosterols in Aging and Human Diseases

Part of the book series: Advances in Experimental Medicine and Biology ((AEMB,volume 1440))

Abstract

Atherosclerosis is a major cardiovascular complication of diseases associated with elevated oxidative stress such as type 2 diabetes and metabolic syndrome. In these situations, low-density lipoproteins (LDL) undergo oxidation. Oxidized LDL displays proatherogenic activities through multiple and complex mechanisms which lead to dysfunctions of vascular cells (endothelial cells, smooth muscle cells, and macrophages). Oxidized LDLs are enriched in oxidized products of cholesterol called oxysterols formed either by autoxidation, enzymatically, or by both mechanisms. Several oxysterols have been shown to accumulate in atheroma plaques and to play a key role in atherogenesis. Depending on the type of oxysterols, various biological effects are exerted on vascular cells to regulate the formation of macrophage foam cells, endothelial integrity, adhesion and transmigration of monocytes, plaque progression, and instability. Most of these effects are linked to the ability of oxysterols to induce cellular oxidative stress and cytotoxicity mainly through apoptosis and proinflammatory mediators. Like for excess cholesterol, high-density lipoproteins (HDL) can exert antiatherogenic activity by stimulating the efflux of oxysterols that have accumulated in foamy macrophages.

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Abbreviations

4β-OHC:

4β-Hydroxycholesterol

5,6α-EC:

5α,6α-Epoxycholesterol

5,6β-EC:

5β,6β-Epoxycholesterol

7α-OHC:

7α-Hydroxycholesterol

7β-OHC:

7β-Hydroxycholesterol

7KC:

7-Ketocholesterol

20S-OHC:

20(S)-Hydroxycholesterol

22R-OHC:

22(R)-Hydroxycholesterol

22S-OHC:

22(S)-Hydroxycholesterol

24S-OHC:

24(S)-Hydroxycholesterol

25-OHC:

25-Hydroxycholesterol

27-OHC:

27-Hydroxycholesterol

CH25H:

Cholesterol 25-hydroxylase

CT:

Cholestane-3β-5α-6β-triol

EC:

Endothelial cells

ER:

Endoplasmic reticulum

HDL:

High-density lipoprotein

IL:

Interleukin

MMP:

Matrix metalloproteinase

oxLDL:

Oxidized low-density lipoprotein

SMC:

Smooth muscle cells

TNFα:

Tumor necrosis factor

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Acknowledgment

This work was supported by funding from INSA Lyon.

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Correspondence to Isabelle Delton .

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© 2024 The Author(s), under exclusive license to Springer Nature Switzerland AG

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Luquain-Costaz, C., Delton, I. (2024). Oxysterols in Vascular Cells and Role in Atherosclerosis. In: Lizard, G. (eds) Implication of Oxysterols and Phytosterols in Aging and Human Diseases. Advances in Experimental Medicine and Biology, vol 1440. Springer, Cham. https://doi.org/10.1007/978-3-031-43883-7_11

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