Insulin-like growth factor-2 (IGF-2) activates estrogen receptor-α and -β via the IGF-1 and the insulin receptors in breast cancer cells.

Insulin-like growth factor-2 (IGF-2) activates estrogen receptor-α and -β via the IGF-1 and the insulin receptors in breast cancer cells.
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DOI:
10.3109/08977194.2011.565003
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发表时间:
2011-04
期刊:
Growth factors (Chur, Switzerland)
影响因子:
--
通讯作者:
De León D
De León D
中科院分区:
其他
文献类型:
--
作者:
Richardson AE;Hamilton N;Davis W;Brito C;De León D

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雌激素受体(ER)是乳腺癌(BC)治疗的主要靶点。随着 BC 进展到不依赖雌激素的生长,IGF-1R 和 ER 以协同串扰机制相互作用,导致两种受体信号级联的激活增强。胰岛素样生长因子 2 (IGF-2) 在 BC 进展中至关重要,其作用由 IGF-1R 介导。我们之前的研究表明,IGF-2 调节保护线粒体并促进化疗耐药的存活基因。在本研究中,我们通过亚细胞分级分离、Western-Blot、qRT-PCR 和 siRNA 分析来分析 BC 细胞。我们的结果表明,IGF-2 激活 ER-α 和 ER-β 并调节它们向细胞核、膜细胞器和线粒体的易位。 IGF-2 的作用由 IGF-1R 和胰岛素受体 (IR) 介导。 IGF-2与ER-α和ER-β协同串扰信号传导的这种新机制可以促进不依赖雌激素的乳腺癌进展,为乳腺癌患者的治疗提供新的治疗靶点。
The estrogen receptor (ER) is a primary target for breast cancer (BC) treatment. As BC progresses to estrogen-independent growth, the IGF-1R and the ER interact in synergistic crosstalk mechanisms which results in enhanced activation of both receptors signaling cascades. Insulin-like growth factor 2 (IGF-2) is critical in BC progression and its actions are mediated by the IGF-1R. Our previous studies showed that IGF-2 regulates survival genes that protect the mitochondria and promote chemoresistance. In this study, we analyzed BC cells by subcellular fractionation, Western-Blot, qRT-PCR and siRNA analysis. Our results demonstrate that IGF-2 activates ER-α and ER-β and modulates their translocation to the nucleus, membrane organelles and the mitochondria. IGF-2 actions are mediated by the IGF-1R and the insulin receptor (IR). This novel mechanism of IGF-2 synergistic crosstalk signaling with ER-α and ER-β can promote estrogen-independent BC progression and provides new therapeutic targets for the treatment of breast cancer patients.
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