Ouzounova, MariaVuong, TriAncey, Pierre-BenoitFerrand, MylèneDurand, GeoffroyLe-Calvez Kelm, FlorenceCroce, CarloMatar, ChantalHerceg, ZdenkoHernandez-Vargas, Hector2015-12-182015-12-182013-02-28BMC Genomics. 2013 Feb 28;14(1):139http://dx.doi.org/10.1186/1471-2164-14-139http://hdl.handle.net/10393/33514Abstract Background A subset of breast cancer cells displays increased ability to self-renew and reproduce breast cancer heterogeneity. The characterization of these so-called putative breast tumor-initiating cells (BT-ICs) may open the road for novel therapeutic strategies. As microRNAs (miRNAs) control developmental programs in stem cells, BT-ICs may also rely on specific miRNA profiles for their sustained activity. To explore the notion that miRNAs may have a role in sustaining BT-ICs, we performed a comprehensive profiling of miRNA expression in a model of putative BT-ICs enriched by non-attachment growth conditions. Results We found breast cancer cells grown under non-attachment conditions display a unique pattern of miRNA expression, highlighted by a marked low expression of miR-30 family members relative to parental cells. We further show that miR-30a regulates non-attachment growth. A target screening revealed that miR-30 family redundantly modulates the expression of apoptosis and proliferation-related genes. At least one of these targets, the anti-apoptotic protein AVEN, was able to partially revert the effect of miR-30a overexpression. Finally, overexpression of miR-30a in vivo was associated with reduced breast tumor progression. Conclusions miR30-family regulates the growth of breast cancer cells in non-attachment conditions. This is the first analysis of target prediction in a whole family of microRNAs potentially involved in survival of putative BT-ICs.Journal Article2015-12-18enOuzounova et al.; licensee BioMed Central Ltd.