Antiproliferative and antiviral mechanisms of ursolic acid and dexamethasone in cervical carcinoma cell lines

被引:64
作者
Yim, E. -K.
Lee, M. -J.
Lee, K. -H.
Um, S. -J.
Park, J. -S.
机构
[1] Catholic Univ Korea, Dept Obstet & Gynecol, Div Gynecol Oncol, Seoul 137040, South Korea
[2] Sejong Univ, Dept Biosci & Biotechnol, Seoul, South Korea
关键词
apoptosis; cervical cancer; dexamethasone; human papillomavirus (HPV); ursolic acid;
D O I
10.1111/j.1525-1438.2006.00726.x
中图分类号
R73 [肿瘤学];
学科分类号
100214 ;
摘要
The chemical structure of ursolic acid is very similar to that of dexamethasone, a synthetic glucocorticoid. Herein, we investigated the antiproliferative and antiviral effects of ursolic acid and dexamethasone in human papillomavirus (HPV)-associated cervical cancer cells. We performed 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazonium bromide assay to measure antiproliferative activity, and also characterized apoptosis by DNA fragmentation, 4'-6-diamidino-2-phenylindole (DAPI) staining, and flow cytometry (FACS) analysis. We investigated apoptosis-related proteins using western blots. After in vitro treatment, we used reverse transcription-polymerase chain reaction for the expression of the HPV E6/E7 gene to observe the antiviral effects. Ursolic acid suppressed the growth of HPV-positive cervical carcinoma cells (HeLa, CaSki, and SiHa) in a dose- and time-dependent manner, but not the HPV-negative cervical cancer cell line (C33A). Ursolic acid-treated HeLa cells showed typical apoptosis characteristics in DNA fragmentation, DAPI staining, and FACS analysis. The expression of Fas protein was induced, and caspase-8, caspase-3, and poly ADP-ribose polymerase (PARP) proteins were cleaved after ursolic acid treatment. HPV-18 E6/E7 gene expression decreased after ursolic acid treatment in HeLa cells, but the levels of p53 and Rb proteins did not change. In contrast, dexamethasone, which has a similar structure, did not inhibit proliferation. Our findings may offer new insight into the mechanism of antiproliferative and antiviral effect of ursolic acid. Also, these results suggest that ursolic acid might be a useful anticancer drug in treatment of HPV-associated cervical neoplasia.
引用
收藏
页码:2023 / 2031
页数:9
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