Artepillin C Inhibits Cell Proliferation by Cell Cycle Arrest at G0/G1 Phase Accompanied by Up-Regulation of p27Kip1 in Human Hepatoma HepG2 Cells
Takashi Hashimoto, Weitao Shang, Kazuki Kanazawa
Journal of Complementary and Alternative Medical Research · pp. 30–43 · Published 8 May 2021
10.9734/jocamr/2021/v14i130236Abstract
Artepillin C, 3, 5-diprenyl-4-hydroxycinnamic acid, is one of the bioactive constituents in Brazilian propolis. In the present study, the anticarcinogenic activity of this compound was investigated in human hepatoma HepG2 cells. Artepillin C inhibited the cell proliferation in a dose- and time-dependent manner accompanied by G0/G1 phase arrest in the cell cycle. This compound caused a decrease in the phosphorylation levels of the retinoblastoma protein at Ser780 and Ser807/811 and a decrease in the kinase activity of the cyclinD and CDK4 complex without any change in these protein levels. Artepillin C increased the protein level of p27Kip1, known as a CDK inhibitor. This up-regulation was regulated by both the transcriptional and post-transcriptional levels, i.e., the treatment increased the mRNA of p27Kip1 and decreased the proteosome activity. Thus, artepillin C induces cell cycle arrest at G0/G1 phase accompanied by up-regulation of p27Kip1, resulting in the inhibition of cell proliferation in HepG2 cells. This study suggested that artepillin C will be a promising anti-cancer agent against hepatoma cancer.
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