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Anti‐obesity actions of green tea: Possible involvements in modulation of the glucose uptake system and suppression of the adipogenesis‐related transcription factors
Author(s) -
Ashida Hitoshi,
Furuyashiki Takashi,
Nagayasu Hironobu,
Bessho Hiroaki,
Sakakibara Hiroyuki,
Hashimoto Takashi,
Kanazawa Kazuki
Publication year - 2004
Publication title -
biofactors
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.204
H-Index - 94
eISSN - 1872-8081
pISSN - 0951-6433
DOI - 10.1002/biof.5520220126
Subject(s) - glut4 , adipose tissue , glucose uptake , medicine , endocrinology , adipogenesis , glucose transporter , chemistry , green tea , green tea extract , skeletal muscle , transcription factor , biology , biochemistry , insulin , gene , food science
To investigate mechanisms of the anti‐obesity actions of green tea in vivo, rats were given green tea instead of drinking water for 3 weeks. It was confirmed that green tea reduced adipose tissue weight without any change in body weight, other tissue weights, and food and water intakes. Green tea also significantly reduced the plasma levels of cholesterols and free fatty acids. Certain catechins existed in the plasma at 0.24 μM under our experimental conditions, though most of them existed as conjugated forms. For mechanisms of the anti‐obesity actions, green tea significantly reduced glucose uptake accompanied by a decrease in translocation of glucose transporter 4 (GLUT4) in adipose tissue, while it significantly stimulated the glucose uptake with GLUT4 translocation in skeletal muscle. Moreover, green tea suppressed the expression of peroxisome proliferator‐activated receptor γ and the activation of sterol regulatory element binding protein‐1 in adipose tissue. In conclusion, green tea modulates the glucose uptake system in adipose tissue and skeletal muscle and suppresses the expression and/or activation of adipogenesis‐related transcription factors, as the possible mechanisms of its anti‐obesity actions.