MicroRNA-320a sensitizes tamoxifen-resistant breast cancer cells to tamoxifen by targeting ARPP-19 and ERRγ.

MicroRNA-320a sensitizes tamoxifen-resistant breast cancer cells to tamoxifen by targeting ARPP-19 and ERRγ.
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MicroRNA-320a 通过靶向 ARPP-19 和 ERRgamma 使对他莫昔芬耐药的乳腺癌细胞对他莫昔芬敏感。

DOI:
10.1038/srep08735
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发表时间:
2015-03-04
期刊:
影响因子:
4.6
通讯作者:
Sun F
Sun F
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Lü M;Ding K;Zhang G;Yin M;Yao G;Tian H;Lian J;Liu L;Liang M;Zhu T;Sun F

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他莫昔芬是雌激素受体α阳性乳腺癌患者的主要辅助治疗药物。然而,他莫昔芬耐药经常发生,无论是从头或在治疗过程中获得。为了研究miR-320 a在三苯氧胺耐药发展中的作用,我们通过持续将MCF-7或T47 D乳腺癌细胞暴露于三苯氧胺建立了三苯氧胺耐药(TamR)模型,并鉴定了microRNA(miRNA)-320 a作为三苯氧胺耐药细胞中下调的miRNA。miR-320 a的再表达足以通过靶向cAMP调节的磷蛋白(ARPP-19)和雌激素相关受体γ(ERRγ)及其下游效应物c-Myc和细胞周期蛋白D1使TamR细胞对他莫昔芬敏感。此外,孕酮(P4)通过抑制c-Myc表达促进miR-320 a的表达,而雌激素(E2)则发挥相反的作用。这些结果提示通过抑制miR-320 a表达或消减ARPP-19/ERRγ表达可能是治疗他莫昔芬耐药乳腺癌的潜在方法。
Tamoxifen represents a major adjuvant therapy to those patients with estrogen receptor-alpha positive breast cancer. However, tamoxifen resistance occurs quite often, either de novo or acquired during treatment. To investigate the role of miR-320a in the development of resistance to tamoxifen, we established tamoxifen-resistant (TamR) models by continually exposing MCF-7 or T47D breast cancer cells to tamoxifen, and identified microRNA(miRNA)-320a as a down-regulated miRNA in tamoxifen resistant cells. Re-expression of miR-320a was sufficient to sensitize TamR cells to tamoxifen by targeting cAMP-regulated phosphoprotein (ARPP-19) and estrogen-related receptor gamma (ERRγ) as well as their downstream effectors, c-Myc and Cyclin D1. Furthermore, progesterone (P4) promoted the expression of miR-320a by repressing c-Myc expression, while estrogen (E2) exerted the opposite effect. These results suggest the potential therapeutic approach for tamoxifen-resistant breast cancer by restorating miR-320a expression or depleting ARPP-19/ERRγ expression.
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