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Activation of fibronectin/PI-3K/Akt2 leads to chemoresistance to docetaxel by regulating survivin protein expression in ovarian and breast cancer cells.

Abstract：

:The purpose of this study was to investigate the possible role of PI-3K/Akt2 pathway in docetaxel-induced apoptosis. Here we showed that transfection of full-length Akt2 into breast and ovarian cancer cells could provoke Akt phosphorylation and induce an enhanced resistance to docetaxel. FN adhesion promoted Akt phosphorylation in highly metastatic cancer cells A2780 and MDAMB231, and further brought on significant protection for tumor cells against docetaxel-induced apoptosis. Inhibition of Akt2 activity by co-transfection with two shRNA vectors targeting the same Akt2 mRNA or simply by administration with PI 3-Kinase inhibitor Ly294002 counteracted the ability of FN to protect cells from undergoing apoptosis induced by docetaxel. We further showed that Akt2 activation protected against docetaxel-induced apoptosis by regulating survivin levels in a PI 3-Kinase-dependent manner. We conclude that FN/PI-3K/Akt2 pathway might play an important role in inducing resistance to docetaxel in breast and ovarian cancer cells. Our results therefore indicate that the activation of Akt2, promoted by FN attachment, might be critical in determining whether cells survive or undergo apoptosis. Targeting the PI-3K/Akt2 pathway might be a promising strategy for enhancing sensitivity to docetaxel in breast or ovarian cancer.

journal_name

Cancer Lett

journal_title

Cancer letters

authors

Xing H,Weng D,Chen G,Tao W,Zhu T,Yang X,Meng L,Wang S,Lu Y,Ma D

doi

10.1016/j.canlet.2007.11.022

subject

Has Abstract

pub_date

2008-03-08 00:00:00

pages

108-19

issue

1

eissn

0304-3835

issn

1872-7980

pii

S0304-3835(07)00550-2

journal_volume

261

pub_type

杂志文章

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