MYC suppresses cancer metastasis by direct transcriptional silencing of αv and β3 integrin subunits.

MYC suppresses cancer metastasis by direct transcriptional silencing of αv and β3 integrin subunits.
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DOI:
10.1038/ncb2491
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发表时间:
2012-05-13
影响因子:
21.3
通讯作者:
--
中科院分区:
生物学1区
文献类型:
--
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MYC的过度表达在培养中转化细胞,在实验动物中诱发恶性肿瘤,并且在许多人类肿瘤中发现。我们现在报告的矛盾的发现,这个强大的癌基因也可以作为一个抑制细胞运动,侵袭和转移。MYC的过表达刺激增殖的乳腺癌细胞在培养和体内的预期,但抑制运动性和侵袭性的文化,和肺和肝转移的异种移植肿瘤。我们进一步表明,MYC抑制αvβ3整联蛋白的两个亚基的转录,并且当MYC下调时,β3整联蛋白在不表达该整联蛋白的人乳腺癌细胞中的外源性表达挽救了侵袭和迁移。这些数据揭示了MYC的一个意想不到的功能,为迄今为止令人困惑的关于MYC与转移之间关系的文献提供了解释,并揭示了一个应该影响靶向MYC的治疗方法发展的变量。
Over-expression of MYC transforms cells in culture, elicits malignant tumors in experimental animals and is found in many human tumors. We now report the paradoxical finding that this powerful oncogene can also act as a suppressor of cell motility, invasiveness and metastasis. Overexpression of MYC stimulated proliferation of breast cancer cells both in culture and in vivo as expected, but inhibited motility and invasiveness in culture, and lung and liver metastases in xenografted tumors. We show further that MYC represses transcription of both subunits of αvβ3 integrin, and that exogenous expression of β3 integrin in human breast cancer cells that do not express this integrin rescues invasiveness and migration when MYC is downregulated. These data uncover an unexpected function of MYC, provide an explanation for the hitherto puzzling literature on the relationship between MYC and metastasis and reveal a variable that should influence the development of therapeutics that target MYC.
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