Estrogen receptor alpha 46 is reduced in tamoxifen resistant breast cancer cells and re-expression inhibits cell proliferation and estrogen receptor alpha 66-regulated target gene transcription.

Estrogen receptor alpha 46 is reduced in tamoxifen resistant breast cancer cells and re-expression inhibits cell proliferation and estrogen receptor alpha 66-regulated target gene transcription.
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DOI:
10.1016/j.mce.2010.03.013
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发表时间:
2010-07-29
影响因子:
4.1
通讯作者:
Magnusen, Joan E.
Magnusen, Joan E.
中科院分区:
医学2区
文献类型:
--
作者:
Klinge, Carolyn M.;Riggs, Krista A.;Wickramasinghe, Nalinie S.;Emberts, Celia G.;McConda, David B.;Barry, Parul N.;Magnusen, Joan E.

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对内分泌治疗的抵抗是乳腺癌的一个主要临床问题。 ERα 剪接变体在内分泌抵抗中的作用很大程度上未知。我们观察到,与 MCF-7 乳腺癌细胞相比,内分泌耐药性 LCC2、LCC9 和 LY2 中 N 末端截短的 ERα46 蛋白表达降低。用 hERα46 转染 LCC9 和 LY2 细胞部分恢复了 TAM 的生长抑制。 MCF-7 细胞中 hERα46 的过表达会减少雌二醇 (E2) 刺激的内源性 pS2、细胞周期蛋白 D1、核呼吸因子 1 (NRF-1) 和孕激素受体转录。与 MCF-7 细胞相比,TAM 抗性 LCC9 和 LY2 细胞中 oncomiR miR-21 的表达较低。 ERα46 转染改变了 E2 调节 miR-21 表达的药理学,从抑制变为刺激,这与 hERα46 抑制 ERα 活性的假设一致。已建立的 miR-21 靶标 PTEN 和 PDCD4 在 ERα46 转染、E2 处理的 MCF-7 细胞中减少。总之,ERα46 似乎通过抑制选定的 ERα66 反应来增强内分泌反应。
Resistance to endocrine therapy is a major clinical problem in breast cancer. The role of ERα splice variants in endocrine resistance is largely unknown. We observed reduced protein expression of an N-terminally truncated ERα46 in endocrine- resistant LCC2, LCC9, and LY2 compared to MCF-7 breast cancer cells. Transfection of LCC9 and LY2 cells with hERα46 partially restored growth inhibition by TAM. Overexpression of hERα46 in MCF-7 cells reduced estradiol (E2)-stimulated endogenous pS2, Cyclin D1, nuclear respiratory factor-1 (NRF-1), and progesterone receptor transcription. Expression of oncomiR miR-21 was lower in TAM-resistant LCC9 and LY2 cells compared to MCF-7 cells. Transfection with ERα46 altered the pharmacology of E2 regulation of miR-21 expression from inhibition to stimulation, consistent with the hypothesis that hERα46 inhibits ERα activity. Established miR-21 targets PTEN and PDCD4 were reduced in ERα46-transfected, E2-treated MCF-7 cells. In conclusion, ERα46 appears to enhance endocrine responses by inhibiting selected ERα66 responses.
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