Reactive oxygen species induce phosphorylation of serine 118 and 167 on estrogen receptor alpha.

Abstract:

:Estrogen receptor alpha (ERalpha) is a well-known target for signaling pathways originating from growth factor receptors. Reactive oxygen species (ROS) can induce activation of extracellular response kinase 1/2 (Erk1/2) and protein kinase B (Akt). Both kinases have been implicated in the phosphorylation of serine 118 and serine 167 on ERalpha, respectively. This activity may lead either to ligand-independent activation of ERalpha or down-regulation of ERalpha and may contribute to development of the resistance to endocrine therapy. Treatment of MCF-7 human breast cancer cells with glucose oxidase (GO, 0.1 un/ml) induced transient phosphorylation of serine 118 and serine 167. The increase in expression of p-ser118-ERalpha was 355 +/- 98% (mean +/- SD) and of p-ser167-ERalpha was 632 +/- 355%. These effects were enhanced in Her2 over-expressing MCF7 cells. ERalpha expression declined to 63 +/- 20% within the first 90 min of treatment and was below 10% 24 h later. ROS induced phosphorylation of ERalpha resulted in decreased expression of pS2 and progesterone receptor. Activation of Erk1/2 and Akt was transient with highest levels of Erk1/2 being 595 +/- 143% and p-Akt 311 +/- 125%. Inhibition of Erk1/2 by U0126 (10 microM) decreased p-ser118-ERalpha by 51.7 +/- 8.5% and decreased p-ser167-ERalpha by 41.9 +/- 16.9% whereas inhibition of Akt by LY294002 (20 microM) and wortmannin (500 nM) or by siRNA knock-down, had no effect on p-ser167-ERalpha expression. Our data show for the first time that ROS can induce post-translational modifications of ERalpha at serine 118 and serine 167, and may lead to ERalpha down-regulation in human breast cancer cells. Both the phosphorylation and consequent down-regulation of ERalpha may be a mechanism associated with development of endocrine therapy resistance.

authors

Weitsman GE,Weebadda W,Ung K,Murphy LC

doi

10.1007/s10549-008-0221-0

subject

Has Abstract

pub_date

2009-11-01 00:00:00

pages

269-79

issue

2

eissn

0167-6806

issn

1573-7217

journal_volume

118

pub_type

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