Oestrogen receptor α mediates 17β-estradiol enhancement of ovarian cancer cell motility through up-regulation of survivin expression.

Autor: Zhu J, Lu X, Hua KQ, Sun H, Yu YH, Feng YJ, Zhu, Jing, Lu, Xin, Hua, Ke-Qin, Sun, Hong, Yu, Yin-Hua, Feng, You-Ji
Zdroj: Archives of Gynecology & Obstetrics; Sep2012, Vol. 286 Issue 3, p729-737, 9p
Abstrakt: Objective: To determine the role of oestrogen receptor α (ERα) in the regulation of survivin expression by 17β-estradiol (E(2)) in ovarian cancer cells and to evaluate the mechanism of E(2) action on ovarian cancer cell migration.Methods: We performed RT-PCR and Western blot analysis to assess the expression of ERα in the ovarian cancer cell lines NIH:OVCAR-3 and SKOV-3. Full-length ERα cDNA was reintroduced into SKOV-3 cells through stable transfection. After treatment with E(2), with or without pre-incubation of anti-oestrogen compound ICI 182780, RT-PCR and Western blot analysis were performed to detect survivin expression at the mRNA and protein levels. RNA interference (RNAi) was used to inhibit the expression of survivin in SKOV-3 cells. Wound healing-induced migration and Matrigel invasion experiments were performed to determine the motility of ovarian cancer cells. RT-PCR and gelatin zymography were used to detect the expression and activity of MMP-9 in SKOV-3 cells.Results: A stably transfected clone with over-expression of ERα, SKOV-α, was isolated. Exogenous or endogenous expression of ERα in SKOV-3 or NIH:OVCAR-3 cells resulted in a significant up-regulation of survivin in the presence of E(2). Pre-treatment with ICI 182780 attenuated the up-regulation of survivin by E(2). Previous data from our laboratory showed that E(2) enhanced the motility of ovarian cancer cells. RNAi strongly inhibited survivin expression in SKOV-3 cells. Knock-down of survivin expression reduced the migration and invasion of SKOV-3 cells, which correlated with down-regulation of MMP9 mRNA expression and activity.Conclusions: ERα may be responsible for the up-regulation of survivin after E(2) treatment in ovarian cancer cells. The mechanism of oestrogen-promoted ovarian cancer metastasis may due to the up-regulation of survivin conducted through the ERα signalling pathway. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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