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Induction of p53-Dependent G1 Cell Cycle Arrest by Rhus verniciflua. Stokes Extract in Human Breast Carcinoma MCF-7 Cells  

Hong, Sang-hoon (Dept. of Korean Internal Medicine, College of Korean Medicine, Dong-Eui University)
Han, Min-ho (Dept. of Biochemistry, College of Korean Medicine, Dong-Eui University)
Choi, Yung-hyun (Dept. of Biochemistry, College of Korean Medicine, Dong-Eui University)
Park, Sang-eun (Dept. of Korean Internal Medicine, College of Korean Medicine, Dong-Eui University)
Publication Information
The Journal of Internal Korean Medicine / v.36, no.1, 2015 , pp. 13-21 More about this Journal
Abstract
Objectives : In Korea, Rhus verniciflua Stokes (RVS) has been used in traditional medicine for various diseases such as back pain, syndromes of the blood system in women, gastrointestinal disease, and cancer. However, the molecular mechanisms of its anti-cancer activity have not been clearly elucidated yet. Methods : This study investigated the possible mechanisms by which RVS extract (RVE) exerts its anti-proliferative action in cultured human breast carcinoma MCF-7 cells. Results : Treatment with RVE in MCF-7 cells resulted in inhibition of cell viability through G1 arrest of the cell cycle and induction of apoptosis in a time- and concentration-dependent manner, as determined by MTT assay and flow cytometry analysis. The induction of G1 arrest by RVE treatment was associated with the inhibition of cyclin D1, cyclin-dependent kinase (Cdk) 2, retinoblastoma protein (pRB), and mouse double minute 2 (MDM2) expression. Moreover, RVE treatment concentration dependently increased the levels of tumor suppressor p53, which was associated with the marked induction of Cdk inhibitors such as p21 (Waf1/Cip1) and p27 (Kip1). However, the inhibition of p53 function by the wild-type p53-specific inhibitor, pifithrin-α, abolished the above-mentioned effects of RVE, showing that p53 was responsible for the cytotoxicity of RVE Conclusions : These data indicate that a molecular pathway involving p53-dependent G1 cell cycle arrest plays a pivotal role in the cellular response to RVE, and demonstrate the potential applications of RVE as an anti-cancer drug for breast cancer treatment.
Keywords
Rhus verniciflua; breast cancer; G1 arrest; p53;
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