A Phosphotyrosine Switch in Estrogen Receptor β Is Required for Mouse Ovarian Function.

A Phosphotyrosine Switch in Estrogen Receptor β Is Required for Mouse Ovarian Function.
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DOI:
10.3389/fcell.2021.649087
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发表时间:
2021
影响因子:
5.5
通讯作者:
Li R
Li R
中科院分区:
生物学2区
文献类型:
--
作者:
Yuan B;Yang J;Dubeau L;Hu Y;Li R

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两种同源雌激素受体ERα和ERβ对其同源组织具有不同的作用。本实验室先前的工作鉴定了一种ERβ特异性磷酸酪氨酸残基,其在乳腺癌细胞中调节ERβ转录活性和抗肿瘤功能。为了确定ERβ磷酸酪氨酸残基在正常组织发育和功能中的生理作用,我们研究了一种突变小鼠模型(Y55F),其中内源性小鼠ERβ中的这种特定酪氨酸残基突变为苯丙氨酸。虽然与野生型同窝小鼠大体上无法区分,但突变型雌性小鼠表现出生育力降低、卵巢卵泡细胞增殖减少和孕酮水平降低。此外,超排卵过程中雌性小鼠的突变ERβ在卵巢组织中激活其靶基因的启动子方面存在缺陷。因此,我们的研究结果为同种型特异性ERβ磷酸化在小鼠卵巢发育和功能中的作用提供了令人信服的遗传和分子证据。
The two homologous estrogen receptors ERα and ERβ exert distinct effects on their cognate tissues. Previous work from our laboratory identified an ERβ-specific phosphotyrosine residue that regulates ERβ transcriptional activity and antitumor function in breast cancer cells. To determine the physiological role of the ERβ phosphotyrosine residue in normal tissue development and function, we investigated a mutant mouse model (Y55F) whereby this particular tyrosine residue in endogenous mouse ERβ is mutated to phenylalanine. While grossly indistinguishable from their wild-type littermates, mutant female mice displayed reduced fertility, decreased ovarian follicular cell proliferation, and lower progesterone levels. Moreover, mutant ERβ from female mice during superovulation is defective in activating promoters of its target genes in ovarian tissues. Thus, our findings provide compelling genetic and molecular evidence for a role of isotype-specific ERβ phosphorylation in mouse ovarian development and function.
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