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European Journal of Nutrition

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01.08.2015 | Original Contribution

Sesamol and sesame (Sesamum indicum) oil enhance macrophage cholesterol efflux via up-regulation of PPARγ1 and LXRα transcriptional activity in a MAPK-dependent manner

verfasst von: Amin F. Majdalawieh, Hyo-Sung Ro

Erschienen in: European Journal of Nutrition | Ausgabe 5/2015

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Abstract

Purpose

Cholesterol clearance by macrophages is a vital process to eliminate excess cholesterol from the body. Internalization of modified cholesterol by macrophages triggers overexpression of peroxisome proliferator-activated receptor γ1 (PPARγ1) and liver X receptor α (LXRα), two transcription factors that are critically involved in macrophage cholesterol efflux. Recent studies demonstrate that oral administration of sesamol derivative (INV-403) and sesame oil leads to a significant attenuation of atherosclerosis in Watanabe heritable hyperlipidemic rabbits and LDLR^−/− mice, respectively. However, the exact molecular mechanisms underlying such anti-atherogenic effects remain largely unrevealed.

Methods

Luciferase reporter assays were performed to assess the effects of sesamol and sesame oil on PPARγ1 and LXRα gene expression. The potential of sesamol and sesame oil to modulate cholesterol efflux was evaluated using ³H-cholesterol efflux assays.

Results

Sesamol and sesame oil treatments lead to a significant up-regulation of PPARγ1 and LXRα expression and transcriptional activity in a MAPK-dependent manner. Importantly, primary macrophages display a significantly enhanced cholesterol efflux potential upon treatment with sesamol and sesame oil, and this stimulatory effect is mediated by MAPK signaling.

Conclusions

Our findings suggest that the previously reported anti-atherogenic effects of sesamol and sesame oil could be attributed, at least in part, to enhanced PPARγ1 and LXRα expression and transcriptional activity leading to improved macrophage cholesterol efflux. Our study is novel in elucidating the molecular and cellular mechanisms underlying the protective effects of sesamol and sesame oil against atherosclerosis.

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Titel: Sesamol and sesame (Sesamum indicum) oil enhance macrophage cholesterol efflux via up-regulation of PPARγ1 and LXRα transcriptional activity in a MAPK-dependent manner
verfasst von: Amin F. Majdalawieh
Hyo-Sung Ro
Publikationsdatum: 01.08.2015
Verlag: Springer Berlin Heidelberg
Erschienen in: European Journal of Nutrition / Ausgabe 5/2015
Print ISSN: 1436-6207
Elektronische ISSN: 1436-6215
DOI: https://doi.org/10.1007/s00394-014-0747-3

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Sesamol and sesame (Sesamum indicum) oil enhance macrophage cholesterol efflux via up-regulation of PPARγ1 and LXRα transcriptional activity in a MAPK-dependent manner

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Methods

Results

Conclusions

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