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Open Access Research article

Aqueous extract of post-fermented tea reverts the hepatic steatosis of hyperlipidemia rat by regulating the lipogenic genes expression and hepatic fatty acid composition

Jie Zhou, Liang Zhang, Jingsong Zhang and Xiaochun Wan*

Author Affiliations

Key Laboratory of Tea Biochemistry & Biotechnology, Ministry of Education and Ministry of Agriculture, Anhui Agricultural University, Hefei 230036, China

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BMC Complementary and Alternative Medicine 2014, 14:263  doi:10.1186/1472-6882-14-263

Published: 23 July 2014

Abstract

Background

Post-fermented tea has been used for the prevention of metabolic syndrome in Western China. Present study reports the biochemical mechanism of lipid-lowering effects of Jing-wei fu tea (JWFT), a variety of post-fermented tea on high-fat diet-induced hyperglycemia and obesity in rats.

Methods

Aqueous extract of JWFT was prepared by putting them in boiling water, and then concentrated under reduced pressure. The major compounds of JWFT were determined by high performance liquid chromatography (HPLC). High-fat diet fed rats were orally administered different doses of JWFT aqueous extract (0.5, 1.0 and 2.0 g/kg) for four weeks. At the end of this experiment, hepatic lipids, serum leptin and lipids levels were determined using enzyme-linked immunosorbent assay (ELISA). The hepatic fatty acid composition was analyzed using gas chromatography mass (GC-MS). The relative expression of lipids metabolism genes was analyzed using reverse transcriptase-polymerase chain reaction (RT-PCR).

Results

The results showed that JWFT inhibited the increase in the body weight, abdominal adipose weight, serum lipids and hepatic lipids, and decreased serum leptin levels of high-fat diet fed rats. JWFT normalized hepatic fatty acid composition of hyperlipidemia rats by up-regulating hepatic acetyl-CoA carboxylase (ACC), stearoyl-CoA desaturase 1 (SCD1) and fatty acid synthase (FAS) gene expression, and down-regulating carnitine palmitoyl transferase-1 (CPT1). Furthermore, the results showed that JWFT inhibited the absorption of lipids.

Conclusion

JWFT could mitigate the obesity-induced hepatic steatosis by regulating hepatic lipogenesis and lipolysis.

Keywords:
Post-fermented tea; Lipids; Absorption; Lipogenic genes; Leptin