A pleiotropically acting microRNA, miR-31, inhibits breast cancer metastasis.

A pleiotropically acting microRNA, miR-31, inhibits breast cancer metastasis.
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DOI:
10.1016/j.cell.2009.03.047
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发表时间:
2009-06-12
期刊:
影响因子:
64.5
通讯作者:
Weinberg RA
Weinberg RA
中科院分区:
生物学1区
文献类型:
--
作者:
Valastyan S;Reinhardt F;Benaich N;Calogrias D;Szász AM;Wang ZC;Brock JE;Richardson AL;Weinberg RA

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MicroRNAs are well-suited to regulate tumor metastasis due to their capacity to coordinately repress numerous target genes, thereby potentially enabling their intervention at multiple steps of the invasion-metastasis cascade. We identify a microRNA exemplifying these attributes, miR-31, whose expression correlates inversely with metastasis in human breast cancer patients. Overexpression of miR-31 in otherwise-aggressive breast tumor cells suppresses metastasis. We deploy a stable microRNA sponge strategy to stably inhibit miR-31 in vivo; this allows otherwise-non-aggressive breast cancer cells to metastasize. These phenotypes do not involve confounding influences on primary tumor development and are specifically attributable to miR-31-mediated inhibition of several steps of metastasis, including local invasion, extravasation or initial survival at a distant site, and metastatic colonization. Such pleiotropy is achieved via coordinate repression of a cohort of metastasis-promoting genes, including RhoA. Indeed, RhoA re-expression partially reverses miR-31-imposed metastasis-suppression. These findings indicate that miR-31 uses multiple mechanisms to oppose metastasis.
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