Fermented tea improves glucose intolerance in mice by enhancing translocation of glucose transporter 4 in skeletal muscle

Yoko Yamashita, Lihua Wang, Zhang Tinshun, Toshiyuki Nakamura, Hitoshi Ashida

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

The antihyperglycemic effects of tea are well documented. However, the effects of fermented tea on the translocation of glucose transporter 4 (GLUT4), the major glucose transporter for glucose uptake in the postprandial period, in skeletal muscle and the underlying molecular mechanisms are not fully understood. This study investigated the translocation of GLUT4 and its related signaling pathways in skeletal muscle of male ICR mice given fermented tea. Intake of oolong, black, or pu-erh tea for 7 days enhanced GLUT4 translocation to the plasma membrane of skeletal muscle. Each type of fermented tea stimulated the phosphorylation of phosphoinositide 3-kinase (PI3K), Akt/protein kinase B, and AMP-activated protein kinase (AMPK). Fermented tea also increased the protein expression of insulin receptor. These results strongly suggest that fermented tea activates both PI3K/Akt- and AMPK-dependent signaling pathways to induce GLUT4 translocation and increases the expression of insulin receptor to improve glucose intolerance.

Original languageEnglish
Pages (from-to)11366-11371
Number of pages6
JournalJournal of agricultural and food chemistry
Volume60
Issue number45
DOIs
Publication statusPublished - Nov 14 2012
Externally publishedYes

Keywords

  • AMP-activated protein kinase (AMPK)
  • fermented tea
  • glucose transporter 4 (GLUT4)
  • insulin receptor
  • phosphoinositide 3-kinase (PI3K)

ASJC Scopus subject areas

  • Chemistry(all)
  • Agricultural and Biological Sciences(all)

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