title: MicroRNA-206 is differentially expressed in Brca1-deficient mice and regulates epithelial and stromal cell compartments of the mouse mammary gland.
abstract: Depletion of Brca1 leads to defects in mouse mammary gland development and mammary tumors in humans and mice. To explore the role of microRNAs (miRNAs) in this process, we examined the mammary glands of MMTV-Cre Brca1(Co/Co) mice for differential miRNA expression using a candidate approach. Several miRNAs were differentially expressed in mammary tissue at day 1 of lactation and in mammary epithelial cell lines in which Brca1 messenger RNA (mRNA) levels have been reduced. Functional studies revealed that several of these miRNAs regulate mammary epithelial cell function in vitro, including miR-206. Creation and analysis of MMTV-miR-206 transgenic mice showed no effect on lactational mammary development and no tumors, but indicates a role in mammary tissue remodeling in mature mice, potentially involving Igf-1 and Sfrp1. These results indicate the potential of miRNAs to mediate the consequences of Brca1 loss and suggest a novel function for miR-206.
authors.affiliation: School of Chemistry and Molecular Biosciences, University of Queensland, St Lucia, Queensland, Australia.
authors.forename: A
authors.initials: A
authors.lastname: Wronski
authors.affiliation: School of Chemistry and Molecular Biosciences, University of Queensland, St Lucia, Queensland, Australia.
authors.forename: G K
authors.initials: GK
authors.lastname: Sandhu
authors.affiliation: School of Chemistry and Molecular Biosciences, University of Queensland, St Lucia, Queensland, Australia.
authors.forename: M J G
authors.initials: MJ
authors.lastname: Milevskiy
authors.affiliation: School of Chemistry and Molecular Biosciences, University of Queensland, St Lucia, Queensland, Australia.
authors.forename: B L
authors.initials: BL
authors.lastname: Brewster
authors.affiliation: School of Chemistry and Molecular Biosciences, University of Queensland, St Lucia, Queensland, Australia.
authors.forename: J A
authors.initials: JA
authors.lastname: Bridge
authors.affiliation: School of Chemistry and Molecular Biosciences, University of Queensland, St Lucia, Queensland, Australia.
authors.forename: A M
authors.initials: AM
authors.lastname: Shewan
authors.affiliation: School of Chemistry and Molecular Biosciences, University of Queensland, St Lucia, Queensland, Australia.|QIMR Berghofer Medical Research Institute, Brisbane, Queensland, Australia.
authors.forename: S L
authors.initials: SL
authors.lastname: Edwards
authors.affiliation: School of Chemistry and Molecular Biosciences, University of Queensland, St Lucia, Queensland, Australia.|QIMR Berghofer Medical Research Institute, Brisbane, Queensland, Australia.
authors.forename: J D
authors.initials: JD
authors.lastname: French
authors.affiliation: School of Chemistry and Molecular Biosciences, University of Queensland, St Lucia, Queensland, Australia.
authors.forename: M A
authors.initials: MA
authors.lastname: Brown