Phosphorylation of the mutant K303R estrogen receptor alpha at serine 305 affects aromatase inhibitor sensitivity.
Phosphorylation of the mutant K303R estrogen receptor alpha at serine 305 affects aromatase inhibitor sensitivity.
复制标题
DOI:
10.1038/onc.2009.520
复制
发表时间:
2010-04-22
期刊:
影响因子:
8
通讯作者:
Fuqua, S. A. W.
中科院分区:
文献类型:
--
作者:
Barone, I.;Iacopetta, D.;Covington, K. R.;Cui, Y.;Tsimelzon, A.;Beyer, A.;Ando, S.;Fuqua, S. A. W.
关键词:
We previously identified a lysine to arginine transition at residue 303 (K303R) in ERα in invasive breast cancers, which confers resistance to the aromatase inhibitor (AI) anastrozole (Ana) when expressed in MCF-7 breast cancer cells. Here we show that AI resistance arises through an enhanced cross-talk of the IGF-1R/IRS-1/Akt pathway with ERα, and the serine (S) residue 305 adjacent to the K303R mutation plays a key role in mediating this cross-talk. The ERα S305 residue is an important site that modifies response to tamoxifen; thus, we questioned whether this site could also influence AI response. We generated stable transfectants expressing wild-type (WT), K303R ERα, or a double K303R/S305A mutant receptor, and found that the AI-resistant phenotype associated with expression of the K303R mutation was dependent on activation of S305 within the receptor. Ana significantly reduced growth in K303R/S305A-expressing cells. Preventing S305 phosphorylation with a blocking peptide inhibited IGF-1R/IRS-1/Akt activation, and also restored AI sensitivity. Our data suggest that the K303R mutation and the S305 ERα residue may be a novel determinant of aromatase inhibitor response in breast cancer, and blockade of S305 phosphorylation represents a new therapeutic strategy for treating tumors resistant to hormone therapy.
登录
查看更多内容
影响因子:
11.2
作者:
Barone I;Cui Y;Herynk MH;Corona-Rodriguez A;Giordano C;Selever J;Beyer A;Andò S;Fuqua SA
通讯作者:
Fuqua SA
影响因子:
11.5
作者:
Herynk, Matthew H.;Parra, Irma;Fuqua, Suzanne A. W.
通讯作者:
Fuqua, Suzanne A. W.
影响因子:
5.8
作者:
Deeb, A.;Jaeaeskelaeinen, J.;Hughes, I. A.
通讯作者:
Hughes, I. A.
影响因子:
8
作者:
Brenet, F.;Socci, N. D.;Holland, E. C.
通讯作者:
Holland, E. C.
影响因子:
7.5
作者:
EVAN, GI;BROWN, L;HARRINGTON, E
通讯作者:
HARRINGTON, E