EGCG和红茶多酚对HepG_2细胞脂质代谢相关基因表达的影响

目的:探讨表没食子儿茶素没食子酸酯(EGCG)和红茶多酚对人肝细胞癌HepG2细胞脂质代谢相关基因表达的影响。方法:HepG2细胞经EGCG(5μmol/L),红茶多酚(5μg/ml)或0.1%二甲亚枫(对照组)处理8h后,抽提RNA,并杂交至人14kcDNA芯片进行基因表达谱分析。应用实时RT-PCR技术对芯片结果进行验证。结果:HepG2细胞经EGCG和红茶多酚处理后表达差异的脂质代谢相关基因数分别为13条和29条,其中表达差异一致的基因有6条。实时RT-PCR结果与芯片结果一致。结论:EGCG和红茶多酚影响脂质代谢的机制是复杂的,此次实验发现的新靶标为今后茶多酚降脂作用研究提供了新的依据。

EFFECTS OF (-)EPIGALLOCATECHIN GALLATE AND BLACK TEA POLYPHENOLS ON LIPID METABOLISM RELATED GENE EXPRESSION OF HepG2 CELLS

Objective: To investigate the effect of (-) epigallocatechin gallate (EGCG) and black tea polyphenols on the lipid metabolism related gene expression profile of human hepatocellular carcinoma HepG2 cells. Method: The total RNA was isolated from HepG2 cells treated with EGCG (5μ mol/L), black tea polyphenols (5μg/ml) or 0.1%DMSO (control) for 8 h and was hybridized to Human 14k cDNA microarray for gene expression profile analysis. Real-time RT-PCR was conducted to confirm microarray data. Results: A total of 13 and 29 genes related to lipid metabolism showed differential change after EGCG or black tea polphenols treatment respectively, of which six genes showed consistent expression. The results of real-time PCR were consistent with the microarray data. Conclusion: The mechanism(s) by which EGCG and black tea polyphenols exerts its effects on lipid metabolism are comprehensive. The novel target identified in this study may provide new evidence for further investigation in the hypolipidemic effects of tea polyphenols.