Mus musculus
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ABSTRACT:
PROVIDER: PRJNA268910 | ENA |
REPOSITORIES: ENA
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Project description:The aim of this study was to identify transcriptional changes in hormone receptor positive (HR+) cells during the dynamic morphogenesis in mammary epithelium during early pregnancy. HR+ cells translate the systemic hormonal signals that indicate pregnancy into local instructions for the generation of alveoli (milk-producing units). We previously found that IGF-2 is produced by HR+ cells, but this is only detectable in early pregnancy and not in virgin animals. This data set was generated to charachterize what other genes become expressed in HR+ cells specifically during a time of active proliferation and cellular communication. The gene expression profile at 3 days of pregnancy shows a marked upregulation of genes involved in cell division. By the 7th day of pregnancy the HR+ cells induce expression of several secreted molecules. Taken together with EdU incorporation analysis, we find that HR+ cells first undergo an expansion phase and subsequently express paracrine stimulators of alveolar and basal mammary epithelial cells during early pregnancy.
2014-12-02 | GSE63720 | GEO
Project description:The mouse mammary gland undergoes severe morphological changes during each pregnancy cycle. These are controlled by epithelial as well as stromal factors, including fibroblasts. This project aimed to identify factors that are expressed in mammary fibroblasts during early pregnancy (day3) when the first morphological changes become microscopically visible.
2021-09-28 | GSE167438 | GEO
Project description:The mammary gland undergoes extensive remodeling between the begin- ning of pregnancy and lactation; this involves cellular processes including cell proliferation, differentiation, and apoptosis, all of which are under the control of numerous regulators. To unravel the role played by miRNA, we describe here 47 new ovine miRNA cloned from mammary gland in early pregnancy displaying strong similari- ties with those already identified in the cow, human, or mouse. A microarray study of miRNA variations in the adult ovine mammary gland during pregnancy and lactation showed that 100 miRNA are regulated according to three principal patterns of expression: a de- crease in early pregnancy, a peak at midpregnancy, or an increase throughout late pregnancy and lactation. One miRNA displaying each pattern (miR-21, miR-205, and miR-200b) was analyzed by qRT- PCR. Variations in expression were confirmed for all three miRNA. Using in situ hybridization, we detected both miR-21 and miR-200 in luminal mammary epithelial cells when expressed, whereas miR-205 was expressed in basal cells during the first half of pregnancy and then in luminal cells during the second half. We therefore conclude that miR-21 is strongly expressed in the luminal cells of the normal mammary gland during early pregnancy when extensive cell prolif- eration occurs. In addition, we show that miR-205 and miR-200 are coexpressed in luminal cells, but only during the second half of pregnancy. These two miRNA may cooperate to maintain epithelial status by repressing an EMT-like program, to achieve and preserve the secretory phenotype of mammary epithelial cells. 5 samples for sheep and 5 samples for mouse
2013-01-04 | E-GEOD-32654 | biostudies-arrayexpress
Project description:The mammary gland undergoes extensive remodeling between the begin- ning of pregnancy and lactation; this involves cellular processes including cell proliferation, differentiation, and apoptosis, all of which are under the control of numerous regulators. To unravel the role played by miRNA, we describe here 47 new ovine miRNA cloned from mammary gland in early pregnancy displaying strong similari- ties with those already identified in the cow, human, or mouse. A microarray study of miRNA variations in the adult ovine mammary gland during pregnancy and lactation showed that 100 miRNA are regulated according to three principal patterns of expression: a de- crease in early pregnancy, a peak at midpregnancy, or an increase throughout late pregnancy and lactation. One miRNA displaying each pattern (miR-21, miR-205, and miR-200b) was analyzed by qRT- PCR. Variations in expression were confirmed for all three miRNA. Using in situ hybridization, we detected both miR-21 and miR-200 in luminal mammary epithelial cells when expressed, whereas miR-205 was expressed in basal cells during the first half of pregnancy and then in luminal cells during the second half. We therefore conclude that miR-21 is strongly expressed in the luminal cells of the normal mammary gland during early pregnancy when extensive cell prolif- eration occurs. In addition, we show that miR-205 and miR-200 are coexpressed in luminal cells, but only during the second half of pregnancy. These two miRNA may cooperate to maintain epithelial status by repressing an EMT-like program, to achieve and preserve the secretory phenotype of mammary epithelial cells.
2013-01-04 | GSE32654 | GEO
Project description:Pregnancy-Induced Non-Coding RNA (PINC) is upregulated in alveolar cells of the mammary gland during pregnancy and persist in alveolar cells that remain in the regressed lobules following involution. Here, we show that in the post-pubertal mouse mammary gland, mPINC expression increases throughout pregnancy and then declines in early lactation, when alveolar cells undergo terminal differentiation. Accordingly, mPINC expression is significantly decreased when HC11 mammary epithelial cells are induced to differentiate and produce milk proteins. This natural reduction in mPINC levels may be necessary for lactation, as overexpression of mPINC in HC11 cells blocks lactogenic differentiation, while knockdown of mPINC enhances differentiation. HC11 mammary epithelial cells, with or without knockdown or over-expression of PINC, and with or without treatment by differentiation-inducing agents, were profiled for gene expression.
2012-08-08 | E-GEOD-38052 | biostudies-arrayexpress
Project description:Myoepithelial and luminal cells synergistically expand in the mammary gland during pregnancy, and this process is precisely governed by hormone-related signaling pathways. The BMP signaling pathway is now known to play crucial roles in all organ systems. However, the functions of BMP signaling in the mammary gland remain unclear. Here, we found that Bmpr1a is upregulated by hormone-induced Sp1 at pregnancy. Using a doxycycline (Dox)-inducible Bmpr1a conditional knockout mouse model, we demonstrated that loss of Bmpr1a results in compromised myoepithelial integrity, reduced mammary stem cells and precocious alveolar differentiation during pregnancy. Mechanistically, Bmpr1a regulates the expression of p63 and Slug, two key regulators of myoepithelial maintenance, through pSmad1/5-Smad4 complexes, and consequently activate P-cadherin during pregnancy. Collectively, these findings identify a novel role of BMP signaling in maintaining the identity of myoepithelial cells and suppressing precocious alveolar formation.
2021-03-05 | GSE164550 | GEO
Project description:Pregnancy-Induced Non-Coding RNA (PINC) is upregulated in alveolar cells of the mammary gland during pregnancy and persist in alveolar cells that remain in the regressed lobules following involution. Here, we show that in the post-pubertal mouse mammary gland, mPINC expression increases throughout pregnancy and then declines in early lactation, when alveolar cells undergo terminal differentiation. Accordingly, mPINC expression is significantly decreased when HC11 mammary epithelial cells are induced to differentiate and produce milk proteins. This natural reduction in mPINC levels may be necessary for lactation, as overexpression of mPINC in HC11 cells blocks lactogenic differentiation, while knockdown of mPINC enhances differentiation.
2012-08-09 | GSE38052 | GEO
Project description:hormone receptor-positive early breast cancer by Nanostring BC360 panel
| EGAD00010001994 | EGA
Project description:We have developed novel genetically engineered mouse mammary cancer models that develop hormone receptor-positive or -negative tumors depending on the combination of genetic abrrations induced in tumors. Tumors with loss of Brca1 and Trp53 are hormone receptor (HR) negative and tumors with or without Brca1 loss together with concomitant loss of Trp53 and inhibition of proteins of Rb family (Rbf) are HR positive. Transcriptome analysis revealed that HR-positive and -negative mammary tumors recapitulated human luminal and basal-like breast cancer expression signatures, respectively, confirming the histology-defined subtypes.
2022-11-04 | GSE206068 | GEO
Project description:The mammary gland develops mainly postnatally, when during pregnancy the epithelium grows out into the mammary fat pad and forms a network of epithelial ducts. During pregnancy, these ducts branch and bud to form alveoli. These alveoli produce the milk during lactation. After 7 days of lactation, involution was induced by force weaning the pups. The newly formed epithelium undergoes apoptosis and is removed from the tissue by neighbouring epithelial cells. Tissue remodelling leads to a morphology resembling a gland of a pre-pregnant mouse. Microarray analysis was used to measure mRNA expression of genes during puberty, pregnancy, lactation and involution in a Balb/c mouse strain. Keywords: developmental time course
2008-08-01 | GSE12247 | GEO