RUNX3 acts as a tumor suppressor in breast cancer by targeting estrogen receptor α.

RUNX3 acts as a tumor suppressor in breast cancer by targeting estrogen receptor α.
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RUNX3 通过靶向雌激素受体 α 作为乳腺癌肿瘤抑制因子。

DOI:
10.1038/onc.2011.252
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发表时间:
2012-01-26
期刊:
影响因子:
8
通讯作者:
Chen, L-F
Chen, L-F
中科院分区:
医学1区
文献类型:
--
作者:
Huang, B.;Qu, Z.;Ong, C. W.;Tsang, Y-H N.;Xiao, G.;Shapiro, D.;Salto-Tellez, M.;Ito, K.;Ito, Y.;Chen, L-F

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转录因子 RUNX3 在包括乳腺癌在内的许多恶性肿瘤中失活,并且被认为具有肿瘤抑制因子的功能。 RUNX3 如何在乳腺癌中发挥肿瘤抑制作用尚不清楚。在这里,我们发现大约 20% 的雌性 Runx3+/- 小鼠在平均年龄 14.5 个月时自发患上导管癌。此外,RUNX3 可抑制液体培养物和软琼脂中 ERα 阳性 MCF-7 乳腺癌细胞的雌激素依赖性增殖和转化潜力,并抑制严重联合免疫缺陷 (SCID) 小鼠中 MCF-7 细胞的致瘤性。此外,RUNX3 通过降低 ERα 的稳定性来抑制 ERα 依赖性反式激活。与其调节 ERα 水平的能力一致,RUNX3 的表达与乳腺癌细胞系、人类乳腺癌组织和 Runx3+/- 小鼠乳腺肿瘤中 ERα 的表达呈负相关。通过破坏 ERα 的稳定性,RUNX3 在乳腺癌中充当新型肿瘤抑制因子。
Transcription factor RUNX3 is inactivated in a number of malignancies, including breast cancer, and is suggested to function as a tumor suppressor. How RUNX3 functions as a tumor supressor in breast cancer remains undefined. Here, we show that about 20% of female Runx3+/− mice spontaneously developed ductal carcinoma at an average age of 14.5 months. Additionally, RUNX3 inhibits the estrogen-dependent proliferation and transformation potential of ERα-positive MCF-7 breast cancer cells in liquid culture and in soft agar and suppresses the tumorigenicity of MCF-7 cells in severe combined immunodeficiency (SCID) mice. Furthermore, RUNX3 inhibits ERα-dependent transactivation by reducing the stability of ERα. Consistent with its ability to regulate the levels of ERα, expression of RUNX3 inversely correlates with the expression of ERα in breast cancer cell lines, human breast cancer tissues and Runx3+/− mouse mammary tumors. By destabilizing ERα, RUNX3 acts as a novel tumor suppressor in breast cancer.
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