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Abstract Title:

Quercetin suppresses immune cell accumulation and improves mitochondrial gene expression in adipose tissue of diet-induced obese mice.

Abstract Source:

Mol Nutr Food Res. 2015 Oct 26. Epub 2015 Oct 26. PMID: 26499876

Abstract Author(s):

Masuko Kobori, Yumiko Takahashi, Mutsumi Sakurai, Yukari Akimoto, Tojiro Tsushida, Hideaki Oike, Katsunari Ippoushi

Article Affiliation:

Masuko Kobori

Abstract:

SCOPE: To examine the effect of dietary quercetin on the function of epididymal adipose tissue (EAT) in Western diet-induced obese mice.

METHODS AND RESULTS: C57BL/6J mice were fed a control diet; a Western diet high in fat, cholesterol, and sucrose; or the same Western diet containing 0.05% quercetin for 18 weeks. Supplementation with quercetin suppressed the increase in the number of macrophages, the decrease in the ratio of CD4(+) to CD8(+) T cells in EAT, and the elevation of plasma leptin and TNFα levels in mice fed the Western diet. Comprehensive gene expression analysis revealed that quercetin suppressed gene expression associated with the accumulation and activation of immune cells, including macrophages and lymphocytes in EAT. It also improved the expression of the oxidative stress-sensitive transcription factor NFκB, NADPH oxidases, and antioxidant enzymes. Quercetin markedly increased gene expression associated with mitochondrial oxidative phosphorylation and mitochondrial DNA content.

CONCLUSION: Quercetin most likely universally suppresses the accumulation and activation of immune cells, including anti-inflammatory cells, whereas it specifically increased gene expression associated with mitochondrial oxidative phosphorylation. Suppression of oxidative stress and NFκB activity likely contributed to the prevention of the accumulation and activation of immune cells and resulting chronic inflammation. This article is protected by copyright. All rights reserved.

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