Open Access

ARTICLE

Gene expression profiling of HepG2 cells after treatment with black tea polyphenols

Jie Zhong^1,#, Li Deng^2,#, Yu Jiang³, Lianhong Zou³, Huabing Yuan⁴, Shuang-xiang Tan^1,*

1 Scientific Research Department, Hunan Province Institute of Gerontology, Hunan Provincial People’s Hospital/The First Affiliated Hospital of Hunan Normal University, Changsha, China
2 Center of Reproductive Medicine, Hunan Provincial People’s Hospital/The First Affiliated Hospital of Hunan Normal University, Changsha, China
3 Hunan Provincial Key Laboratory of Emergency and Critical Care Metabonomics, Hunan Provincial People’s Hospital/The First Affiliated Hospital of Hunan Normal University, Changsha, China
4 Pharmacy Department, Tianmen First People’s Hospital, Tianmen, Hubei, China

* Address correspondence to: Shuang-xiang Tan,
# Jie Zhong and Li Deng contributed equally to this article.

BIOCELL 2018, 42(3), 99-104. https://doi.org/10.32604/biocell.2018.04915

Abstract

This study aimed to determine the effects of black tea polyphenols on gene expression in hepatocellular cancer cells. The total RNA from HepG2 hepatocellular cancer cells treated with black tea polyphenols was subjected to Human 14K cDNA microarray analysis. Real-time PCR and Western blot analysis were conducted to verify microarray data. Black tea polyphenols treatment at the dose of 20 mg/L, 40 mg/L or 80 mg/L for one to three days inhibited the growth of HepG2 cells in a dose and time dependent manner. A total of 48 genes showed more than two-fold change after black tea polyphenols treatment, including 17 upregulated genes and 31 downregulated genes, and they were involved in the regulation of cell growth, cell cycle, apoptosis, signaling, angiogenesis, tumor invasion and metastasis. Real-time PCR analysis of the selected genes showed that their mRNA expression changes were consistent with the microarray data. In addition, Western blot analysis of the selected genes showed that their protein expression changes were consistent with mRNA expression. In conclusion, gene expression profiles provide comprehensive molecular mechanisms by which black tea polyphenols exerts growth inhibition effects on cancer cells. The novel molecular targets identified in this study may be further exploited as therapeutic strategies for hepatocellular cancer.

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