EGF Protects Cells Against Dox-Induced Growth Arrest Through Activating Cyclin D1 Expression.

Abstract:

:It has been reported that the antitumor drug doxorubicin (Dox) exerts its toxic effects via GATA-4 depletion and that over-expression of GATA-4 reverses Dox-induced toxicity and apoptosis; however, the precise mechanisms remain unclear. In this study, we observed, for the first time, that EGF protects cells against Dox-mediated growth arrest, G2/M-phase arrest, and apoptosis. Additionally, EGF expression was down-regulated in Dox-treated cells and up-regulated in GATA-4 over-expressing cells. Utilizing real-time PCR and western blotting analysis, we found that the expression of the cell cycle-associated protein cyclin D1 was inhibited in GATA-4-silenced cells and Dox-treated cells and was enhanced in GATA-4 over-expressing cells and EGF-treated cells. Furthermore, EGF treatment reversed the inhibited expression of cyclin D1 that was mediated by GATA-4 RNAi or Dox. Our results indicate that EGF, as a downstream target of Dox, may be involved in Dox-induced toxicity as well as in the protective role of GATA-4 against toxicity induced by Dox via regulating cyclin D1 expression, which elucidates a new molecular mechanism of Dox toxicity with important clinical implications.

journal_name

J Cell Biochem

authors

Yao CX,Shi JC,Ma CX,Xiong CJ,Song YL,Zhang SF,Zhang SF,Zang MX,Xue LX

doi

10.1002/jcb.25134

subject

Has Abstract

pub_date

2015-08-01 00:00:00

pages

1755-65

issue

8

eissn

0730-2312

issn

1097-4644

journal_volume

116

pub_type

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