Induction of miRNA-181a by genotoxic treatments promotes chemotherapeutic resistance and metastasis in breast cancer.

Abstract:

:Acquired therapeutic resistance is the major drawback to effective systemic therapies for cancers. Aggressive triple-negative breast cancers (TNBC) develop resistance to chemotherapies rapidly, whereas the underlying mechanisms are not completely understood. Here we show that genotoxic treatments significantly increased the expression of miR-181a in TNBC cells, which enhanced TNBC cell survival and metastasis upon Doxorubicin treatment. Consistently, high miR-181a level associated with poor disease free survival and overall survival after treatments in breast cancer patients. The upregulation of miR-181a was orchestrated by transcription factor STAT3 whose activation depended on NF-κB-mediated IL-6 induction in TNBC cells upon genotoxic treatment. Intriguingly, activated STAT3 not only directly bound to MIR181A1 promoter to drive transcription but also facilitated the recruitment of MSK1 to the same region where MSK1 promoted a local active chromatin state by phosphorylating histone H3. We further identified BAX as a direct functional target of miR-181a, whose suppression decreased apoptosis and increased invasion of TNBC cells upon Dox treatment. These results were further confirmed by evidence that suppression of miR-181a significantly enhanced therapeutic response and reduced lung metastasis in a TNBC orthotopic model. Collectively, our data suggested that miR-181a induction had a critical role in promoting therapeutic resistance and aggressive behavior of TNBC cells upon genotoxic treatment. Antagonizing miR-181a may serve as a promising strategy to sensitize TNBC cells to chemotherapy and mitigate metastasis.

journal_name

Oncogene

journal_title

Oncogene

authors

Niu J,Xue A,Chi Y,Xue J,Wang W,Zhao Z,Fan M,Yang CH,Shao ZM,Pfeffer LM,Wu J,Wu ZH

doi

10.1038/onc.2015.189

subject

Has Abstract

pub_date

2016-03-10 00:00:00

pages

1302-1313

issue

10

eissn

0950-9232

issn

1476-5594

journal_volume

35

pub_type

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