A single oral dose of flavan-3-ols enhances energy expenditure by sympathetic nerve stimulation in mice

Naoya Kamio, Takuma Suzuki, Yuto Watanabe, Yoshitomo Suhara, Naomi Osakabe

Research output: Contribution to journalArticle

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Abstract

Numerous clinical studies have found that ingestion of chocolate reduces the risk of metabolic syndrome, however, the mechanisms were remain unclear. We have reported that a single dose of a flavan-3-ol fraction derived from cocoa (FL) enhanced energy expenditure (EE) and increased the mRNA expression levels of uncoupling proteins (UCPs) and peroxisome proliferator-activated receptor gamma coactivator-1 alpha (PGC-1α), and the protein level of phosphorylated AMP-activated protein kinase (AMPK)α in tissues, along with plasma adrenaline level. In the present study, we examined whether the EE enhancing activity of FL is mediated by adrenergic effect using several adrenalin receptor (AR) blockers. In the first study, mice were butoxamine, as β2AR blocker, with vehicle or 10 mg/kg FL orally. We found that pretreatment with butoxamine prevented the increases of EE, the mRNA expression of UCP-3, and phosphorylated AMPKα that were induced in the gastrocnemius muscle of mice by 10 mg/kg FL. Secondly, mice were given SR52930, as β3AR blocker. Pretreatment with SR52930 prevented the increases of EE, the mRNA expression of UCP-3, and phosphorylated AMPKα that were induced in the gastrocnemius muscle of mice by 10 mg/kg FL. Pretreatment with a combination of both blockers also reduced the increments in mRNA expression levels of UCPs and PGC-1α, however, phosphorylated AMPKα in skeletal muscle was rather increased. These results suggest that the ability of a single oral dose of FL to enhance metabolic activity is mediated by sympathetic nerve system (SNS).

LanguageEnglish
Pages256-263
Number of pages8
JournalFree Radical Biology and Medicine
Volume91
DOIs
StatePublished - 2016 Feb 1

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Butoxamine
Muscle
Messenger RNA
Proteins
Cocoa
AMP-Activated Protein Kinases
Adrenergic Agents
Adrenergic Receptors
Epinephrine
Energy Metabolism
Tissue
Plasmas

Keywords

  • AMPK
  • Energy expenditure
  • Flavan-3-ols
  • Sympathetic nervesystem
  • Uncouplingprotein

ASJC Scopus subject areas

  • Biochemistry
  • Physiology (medical)

Cite this

A single oral dose of flavan-3-ols enhances energy expenditure by sympathetic nerve stimulation in mice. / Kamio, Naoya; Suzuki, Takuma; Watanabe, Yuto; Suhara, Yoshitomo; Osakabe, Naomi.

In: Free Radical Biology and Medicine, Vol. 91, 01.02.2016, p. 256-263.

Research output: Contribution to journalArticle

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