Transcription factor Ets1 cooperates with estrogen receptor α to stimulate estradiol-dependent growth in breast cancer cells and tumors.

Transcription factor Ets1 cooperates with estrogen receptor α to stimulate estradiol-dependent growth in breast cancer cells and tumors.
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DOI:
10.1371/journal.pone.0068815
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Duval DL
Duval DL
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Kalet BT;Anglin SR;Handschy A;O'Donoghue LE;Halsey C;Chubb L;Korch C;Duval DL

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本研究的目的是探讨转录因子 Ets1 在雌激素受体 α (ERα) 阳性乳腺癌进展中的作用。我们在四种人 ERα 阳性乳腺癌细胞系中表达人 Ets1 或空载体,并观察到集落形成增加。对稳定表达 Ets1 的 MCF7 克隆的细胞反应的进一步检查显示增殖、迁移和侵袭增加。与对照 MCF7 肿瘤(2.52±1.70 mm3/天)相比,在裸鼠乳腺脂肪垫中生长的表达 Ets1 的 MCF7 肿瘤表现出增加的肿瘤生长速率(7.36±2.47 mm3/天),但保持了肿瘤生长对雌二醇的依赖性。对照和表达 Ets1 的肿瘤之间的增殖标记物 Ki-67 染色没有差异,但表达 Ets1 的肿瘤表现出大的坏死中心和升高的凋亡染色。 Ets1 与 ERα 和 p160 核受体共激活因子 (NCOA/SRC) 家族合作,增强共有雌激素反应元件荧光素酶报告基因构建体的激活。表达 Ets1 的 MCF7 细胞还表现出 ERα 靶基因、黄体酮受体和三叶因子 1 表达升高。使用 GST 下拉测定,Ets1 形成含有 ERα 和 p160 核受体共激活剂的稳定复合物。综上所述,这些数据表明乳腺癌细胞和肿瘤的 Ets1 依赖性雌二醇致敏可能部分归因于 Ets1 与 ERα 和核受体共激活剂合作刺激雌激素依赖性基因转录活性的能力。
The purpose of this study was to explore the role of transcription factor Ets1 in estrogen receptor α (ERα)-positive breast cancer progression. We expressed human Ets1 or empty vector in four human ERα-positive breast cancer cell lines and observed increased colony formation. Further examination of cellular responses in stable Ets1-expressing MCF7 clones displayed increased proliferation, migration, and invasion. Ets1-expressing MCF7 tumors grown in the mammary fat pads of nude mice exhibited increased rates of tumor growth (7.36±2.47 mm3/day) compared to control MCF7 tumors (2.52±1.70 mm3/day), but maintained their dependence on estradiol for tumor growth. Proliferation marker Ki-67 staining was not different between control and Ets1-expressing tumors, but Ets1-expressing tumors exhibited large necrotic centers and elevated apoptotic staining. Ets1 was shown to cooperate with ERα and the p160 nuclear receptor coactivator (NCOA/SRC) family to increase activation of a consensus estrogen response element luciferase reporter construct. Ets1-expressing MCF7 cells also exhibited elevated expression of the ERα target genes, progesterone receptor and trefoil factor 1. Using GST-pulldown assays, Ets1 formed stable complexes containing both ERα and p160 nuclear receptor coactivators. Taken together, these data suggest that the Ets1-dependent estradiol sensitization of breast cancer cells and tumors may be partially due to the ability of Ets1 to cooperate with ERα and nuclear receptor coactivators to stimulate transcriptional activity of estrogen-dependent genes.
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DOI: 10.1074/jbc.m302433200
发表时间: 2003-10-10
影响因子: 4.8
作者:
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