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Background  The ETS transcription factor ETV4 is involved in the main steps of organogenesis and is also a significant mediator of tumorigenesis and metastasis, such as in breast cancer. Indeed, ETV4 is overexpressed in breast tumors and is associated with distant metastasis and poor prognosis. However, the cellular and molecular events regulated by this factor are still misunderstood. In mammary epithelial cells, ETV4 controls the expression of many genes,  MMP13  among them. The aim of this study was to understand the function of MMP13 during ETV4-driven tumorigenesis.    Methods  Different constructs of the  MMP13  gene promoter were used to study the direct regulation of  MMP13  by ETV4. Moreover, cell proliferation, migration, invasion, anchorage-independent growth, and in vivo tumorigenicity were assayed using models of mammary epithelial and cancer cells in which the expression of MMP13 and/or ETV4 is modulated. Importantly, the expression of  MMP13  and  ETV4  messenger RNA was characterized in 456 breast cancer samples.    Results  Our results revealed that ETV4 promotes proliferation, migration, invasion, and anchorage-independent growth of the MMT mouse mammary tumorigenic cell line. By investigating molecular events downstream of ETV4, we found that MMP13, an extracellular metalloprotease, was an ETV4 target gene. By overexpressing or repressing MMP13, we showed that this metalloprotease contributes to proliferation, migration, and anchorage-independent clonogenicity. Furthermore, we demonstrated that MMP13 inhibition disturbs proliferation, migration, and invasion induced by ETV4 and participates to ETV4-induced tumor formation in immunodeficient mice. Finally, ETV4 and MMP13 co-overexpression is associated with poor prognosis in breast cancer.    Conclusion  MMP13 potentiates the effects of the ETV4 oncogene during breast cancer genesis and progression.    Electronic supplementary material  The online version of this article (10.1186/s13058-018-0992-0) contains supplementary material, which is available to authorized users.

ETV4 transcription factor and MMP13 metalloprotease are interplaying actors of breast tumorigenesis