J Obes Metab Syndr.  2018 Jun;27(2):102-109. 10.7570/jomes.2018.27.2.102.

Quercetin Upregulates Uncoupling Protein 1 in White/Brown Adipose Tissues through Sympathetic Stimulation

Affiliations
  • 1Department of Food Science and Nutrition, University of Ulsan, Ulsan, Korea. rinayu@ulsan.ac.kr

Abstract

BACKGROUND
Uncoupling protein 1 (UCP1) plays an important role in increasing energy expenditure; thus, it is being considered as a new target for preventing obesity and metabolic complications. In this study, we investigated the effect of quercetin, a naturally occurring flavonoid, on UCP1 expression in white/brown adipose tissues (WAT/BAT).
METHODS
Mice were fed a high-fat diet (HFD) supplemented with or without dietary quercetin for 9 weeks, and 3T3-L1 adipocytes were treated with quercetin. Expression of UCP1 and other thermogenic genes/proteins was measured by real-time polymerase chain reaction and/or Western blotting.
RESULTS
Dietary quercetin supplementation increased the level of UCP1 in both WAT and/or BAT of HFD-fed obese mice, which was accompanied by upregulated mRNA levels of thermogenesis-related genes. Quercetin supplementation enhanced the plasma norepinephrine level and tended to upregulate β-adrenergic receptor mRNA level in the WAT of HFD-fed obese mice, accompanied by AMP-activated protein kinase (AMPK) activation. Moreover, quercetin enhanced UCP1 expression in 3T3-L1 adipocytes, and this was blunted by treatment with a peroxisome proliferator-activated receptor gamma (PPARγ) antagonist.
CONCLUSION
These findings suggest that quercetin upregulates UCP1, implying increased WAT browning and BAT activity, via activation of the AMPK/PPARγ pathway through sympathetic stimulation. Quercetin may be useful for preventing obesity and metabolic complications.

Keyword

Obesity; Adipose tissue; Uncoupling protein 1; Quercetin

MeSH Terms

Adipocytes
Adipose Tissue
AMP-Activated Protein Kinases
Animals
Blotting, Western
Diet, High-Fat
Energy Metabolism
Mice
Mice, Obese
Norepinephrine
Obesity
Plasma
PPAR gamma
Quercetin*
Real-Time Polymerase Chain Reaction
RNA, Messenger
AMP-Activated Protein Kinases
Norepinephrine
PPAR gamma
Quercetin
RNA, Messenger
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