Genome-wide profiling of AP-1-regulated transcription provides insights into the invasiveness of triple-negative breast cancer.

Abstract:

:Triple-negative breast cancer (TNBC) is an aggressive clinical subtype accounting for up to 20% of all breast cancers, but its malignant determinants remain largely undefined. Here, we show that in TNBC the overexpression of Fra-1, a component of the transcription factor AP-1, offers prognostic potential. Fra-1 depletion or its heterodimeric partner c-Jun inhibits the proliferative and invasive phenotypes of TNBC cells in vitro. Similarly, RNAi-mediated attenuation of Fra-1 or c-Jun reduced cellular invasion in vivo in a zebrafish tumor xenograft model. Exploring the AP-1 cistrome and the AP-1-regulated transcriptome, we obtained insights into the transcriptional regulatory networks of AP-1 in TNBC cells. Among the direct targets identified for Fra-1/c-Jun involved in proliferation, adhesion, and cell-cell contact, we found that AP-1 repressed the expression of E-cadherin by transcriptional upregulation of ZEB2 to stimulate cell invasion. Overall, this work illuminates the pathways through which TNBC cells acquire invasive and proliferative properties.

journal_name

Cancer Res

journal_title

Cancer research

authors

Zhao C,Qiao Y,Jonsson P,Wang J,Xu L,Rouhi P,Sinha I,Cao Y,Williams C,Dahlman-Wright K

doi

10.1158/0008-5472.CAN-13-3396

subject

Has Abstract

pub_date

2014-07-15 00:00:00

pages

3983-94

issue

14

eissn

0008-5472

issn

1538-7445

pii

0008-5472.CAN-13-3396

journal_volume

74

pub_type

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