Tyrosine phosphorylation regulates ERβ ubiquitination, protein turnover, and inhibition of breast cancer.

Tyrosine phosphorylation regulates ERβ ubiquitination, protein turnover, and inhibition of breast cancer.
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酪氨酸磷酸化调节 ER β 泛素化、蛋白质周转和乳腺癌抑制

DOI:
10.18632/oncotarget.10018
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发表时间:
2016-07-05
期刊:
影响因子:
--
通讯作者:
Li R
Li R
中科院分区:
其他
文献类型:
--
作者:
Yuan B;Cheng L;Gupta K;Chiang HC;Gupta HB;Sareddy GR;Wang D;Lathrop K;Elledge R;Wang P;McHardy S;Vadlamudi R;Curiel TJ;Hu Y;Ye Q;Li R

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与主要促进激素依赖性乳腺肿瘤生长的雌激素受体α(ERα)不同,ERβ在多种癌症类型中显示出抗肿瘤作用。我们最近在ERβ中发现了一个磷酸酪氨酸残基,但没有发现ERα,它决定了ERβ的转录活性和抗肿瘤功能。我们在这里表明,这种ER同型特异性的磷酸酪氨酸开关对于调节ERβ在细胞增殖、迁移和侵袭中的活性是重要的。在机制水平上,招募转录辅活化子p300的磷酸化ERβ又被p300靶向泛素化和蛋白酶体依赖的蛋白质周转。此外,ERβ特异性激动剂如S-QUOL可促进ERβ的磷酸化,提示依赖于配体和翻译后修饰的ERβ激活之间存在串扰。S水煎剂抑制移植瘤生长与降低肿瘤Ki-67表达和上调ERβ酪氨酸磷酸化有关。综上所述,我们的数据支持这样的观点,即依赖磷酸酪氨酸的ERβ信号是抗癌治疗的一个有吸引力的靶点。
Unlike estrogen receptor α (ERα) that predominantly promotes hormone-dependent breast tumor growth, ERβ exhibits antitumor effects in a variety of cancer types. We recently identified a phosphotyrosine residue in ERβ, but not ERα, that dictates ERβ transcriptional activity and antitumor function. We show here that this ER isotype-specific phosphotyrosine switch is important for regulating ERβ activity in cell proliferation, migration, and invasion. At the mechanistic level, phosphorylated ERβ, which recruits transcriptional coactivator p300, is in turn targeted by p300 for ubiquitination and proteasome-dependent protein turnover. Furthermore, ERβ-specific agonists such as S-equol enhance ERβ phosphorylation, suggesting a crosstalk between ligand- and posttranslational modification-dependent ERβ activation. Inhibition of xenograft tumor growth by S-equol is associated with reduced tumor Ki-67 expression and elevated ERβ tyrosine phosphorylation. Taken together, our data support the notion that phosphotyrosine-dependent ERβ signaling is an attractive target for anticancer treatment.
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