Contrasting activities of estrogen receptor beta isoforms in triple negative breast cancer.

Contrasting activities of estrogen receptor beta isoforms in triple negative breast cancer.
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DOI:
10.1007/s10549-020-05948-0
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发表时间:
2021-01
影响因子:
3.8
通讯作者:
Katzenellenbogen BS
Katzenellenbogen BS
中科院分区:
医学2区
文献类型:
--
作者:
Yan S;Dey P;Ziegler Y;Jiao X;Kim SH;Katzenellenbogen JA;Katzenellenbogen BS

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三阴性乳腺癌(TNBC)是乳腺癌的一种侵袭性亚型,缺乏用于预测结果或靶向治疗的三种主要受体。因此,我们的目的是评估雌激素受体β(ERβ)作为TNBC可能的内分泌治疗靶点的潜力。利用TCGA乳腺肿瘤数据分析ERβ亚型的表达及其对预后的影响,并检测ERβ亚型mRNA和蛋白在TNBC细胞系中的表达。用siRNA敲低内源性ERβ2和ERβ5,用强力霉素诱导的慢病毒系统上调ERβ2、ERβ5和ERβ1。评估细胞增殖、迁移和侵袭以及特异性基因表达。ERβ2和ERβ5是TNBC肿瘤和细胞系中ERβ的主要内源性形式。高ERβ2预示着较差的临床结局。内源性ERβ2/ERβ5基因的敲除可抑制细胞的增殖、迁移和侵袭,并下调原癌基因survivin的表达。ERβ2/ERβ5上调则相反,增加了Survivin和这些细胞的活性。在TNBC细胞系中几乎检测不到ERβ1,但其上调降低了生存素,增加了肿瘤抑制因子(E-钙粘蛋白和半胱氨酸蛋白酶抑制剂)的表达,并以配体非依赖性和依赖性方式抑制增殖、迁移和侵袭,表明ERβ配体可能具有翻译益处。ERβ2/ERβ5和ERβ1在TNBC细胞中表现出明显不同的活性。我们的研究结果表明,描绘不同ERβ亚型的绝对量和相对比例可能具有预后和治疗相关性,并且可以更好地选择治疗这种通常侵袭性形式的乳腺癌的最佳方法。
Triple negative breast cancer (TNBC), an aggressive subtype of breast cancer, lacks the three major receptors for predicting outcome or targeting therapy. Hence, our aim was to evaluate the potential of estrogen receptor beta (ERβ) as a possible endocrine therapy target in TNBC. The expression and prognostic effect of ERβ isoforms were analyzed using TCGA breast tumor data, and the expression of ERβ isoform mRNA and protein in TNBC cell lines was assayed. Endogenous ERβ2 and ERβ5 were knocked down with siRNA, and ERβ2, ERβ5, and ERβ1 were upregulated using a doxycycline-inducible lentiviral system. Cell proliferation, migration and invasion, and specific gene expressions were evaluated. ERβ2 and ERβ5 were the predominant endogenous forms of ERβ in TNBC tumors and cell lines. High ERβ2 predicted worse clinical outcome. Knockdown of endogenous ERβ2/ERβ5 in cell lines suppressed proliferation, migration and invasion, and downregulated proto-oncogene survivin expression. ERβ2/ERβ5 upregulation did the reverse, increasing survivin and these cell activities. ERβ1 was barely detectable in TNBC cell lines, but its upregulation reduced survivin, increased tumor-suppressor expression (E-cadherin and cystatins), and suppressed proliferation, migration and invasion in both ligand-independent and dependent manners, suggesting the possible translational benefit of ERβ ligands. ERβ2/ERβ5 and ERβ1 exhibit sharply contrasting activities in TNBC cells. Our findings imply that delineating the absolute amounts and relative ratios of the different ERβ isoforms might have prognostic and therapeutic relevance, and could enable better selection of optimal approaches for treatment of this often aggressive form of breast cancer.
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