Green tea leaf extract improves lipid and glucose homeostasis in a fructose-fed insulin-resistant hamster model.

Abstract:

:The present study evaluated the effect of green tea (Camellia sinensis L.) leaf extract on triglyceride and glucose homeostasis in a fructose-fed hypertriglyceridemic, insulin-resistant hamster model. There was a significant decrease in plasma triglyceride levels following supplementation of the green tea epigallocatechin gallate-enriched extract (42% at 150 mg/(kg day) to 62% at 300 mg/(kg day) for 4 weeks). Compared to baseline, the fructose control group at the end of the study showed elevated serum insulin and apolipoprotein B levels, and decreased serum adiponectin levels. The fructose/green tea extract group showed a reversal in all of these metabolic defects, including an improvement in glucose levels during a glucose tolerance test. Triglyceride content was also examined in various tissues and compared to the control fructose group; supplementation of the green tea extract (300 mg/kg) reduced triglyceride content in liver and heart tissues. There was molecular evidence of improved lipid and glucose homeostasis based on peroxisome proliferator-activated receptor (PPAR) protein expression. Compared to the control fructose group, supplementation of the green tea extract (300 mg/kg) significantly increased PPARalpha and PPARgamma protein expression. In summary, the data suggest that intake of the green tea extract ameliorated the fructose-induced hypertriglyceridemia and the insulin-resistant state in part through PPAR.

journal_name

J Ethnopharmacol

authors

Li RW,Douglas TD,Maiyoh GK,Adeli K,Theriault AG

doi

10.1016/j.jep.2005.08.045

keywords:

subject

Has Abstract

pub_date

2006-03-08 00:00:00

pages

24-31

issue

1-2

eissn

0378-8741

issn

1872-7573

pii

S0378-8741(05)00584-2

journal_volume

104

pub_type

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