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Expression data from osteocytes in virgin,lactating and post lactation mice

ABSTRACT: We have previously shown that during lactation, osteocytes directly remodel their perilacunar and pericanalicular matrix, thereby mobilizing calcium and contributing to maternal bone loss. To identify genes potentially responsible for perilacunar remodeling, microarray analysis was performed on osteocytes from CD-1 virgin and lactating mice and mice sacrificed on day 7 post weaning. By comparing how gene expression changes in osteocytes among virgin, lactation and post lactation, the goal is to identify the genes osteocytes use to remodel their perilacunar matrix

ORGANISM(S): Mus musculus

PROVIDER: GSE23496 | GEO | 2011/12/31

SECONDARY ACCESSION(S): PRJNA131005

REPOSITORIES: GEO

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Expression data from osteocytes in virgin,lactating and post lactation mice

Project description:We have previously shown that during lactation, osteocytes directly remodel their perilacunar and pericanalicular matrix, thereby mobilizing calcium and contributing to maternal bone loss. To identify genes potentially responsible for perilacunar remodeling, microarray analysis was performed on osteocytes from CD-1 virgin and lactating mice and mice sacrificed on day 7 post weaning. By comparing how gene expression changes in osteocytes among virgin, lactation and post lactation, the goal is to identify the genes osteocytes use to remodel their perilacunar matrix To identify genes responsible for perilacunar remodeling, microarray analysis was performed on tibiae from CD-1 virgin and lactating mice and mice sacrificed on day 7 post weaning. Periosteum and bone marrow were removed from the tibiae and the bone fragments underwent sequential collagenase/trypsin digestion and were examined histologically to ensure removal of all surface cells and confirm osteocyte enrichment prior to RNA extraction. Microarray Affy M430 arrays, n=3 per group were performed and Genepattern and Bioconductor were used to analyse the microdata.

2011-12-31 | E-GEOD-23496 | biostudies-arrayexpress

Differential gene expression in lactating rats compared against age matched virgin controls

Project description:Gene level analysis of lactating day 10-11 16h Sprague-Dawley dams compared against age matched virgins. Lactation is a time of significantly increased energy demands imposed by the suckling young that requires a proportional adjustment in the ability of the lactating dam to absorb nutrients and to synthesize critical biomolecules to meet the dietary needs of both the offspring and the dam. We have shown an increase in the size and hydrophobicity of the bile acid pool during lactation [1], implying an increased absorption and disposition of lipids, sterols, nutrients, and xenobiotics. In order to investigate changes at the level of mRNA, we utilized an exon array and calculated gene level summaries to investigate changes in gene expression in the liver, duodenum, jejunum, and ileum of lactating dams when compared against age-matched virgin controls.

2010-11-21 | GSE19175 | GEO

Differential gene expression in lactating rats compared against age matched virgin controls

2010-11-21 | E-GEOD-19175 | biostudies-arrayexpress

RNA-seq profiling of mammary duct macrophages from virgin, pregnant, lactating and post-weaning mice

Project description:Macrophages are diverse immune cells that reside in all tissues. Although macrophages have been implicated in mammary gland function, their diversity has not been fully addressed. By exploiting high-resolution 3D imaging and flow cytometry, we have identified a unique population of tissue-resident ductal macrophages (DMs) that form a contiguous network between the luminal and basal layers of the entire mammary gland throughout post-natal development. DMs are long-lived and constantly survey the epithelium though dendrite movement based on advanced 3D intravital imaging. While they initially originate from embryonic precursors, DMs derive from monocytes as they expand during puberty. Moreover, they undergo proliferation in pregnancy to maintain complete coverage of the epithelium in lactation, where they are poised to phagocytose milk-producing cells post-lactation and facilitate remodelling. Interestingly, DMs strongly resemble mammary tumour macrophages and form a network that pervades the tumour epithelium. Thus, the mammary epithelium programs specialised resident macrophages in both physiological and tumorigenic contexts. To explore expression changes as DMs profilerate in pregnancy and lactation, we sorted DMs from the mouse mammary glands of virgin, pregnant, lactating and post-weaning mice and undertook RNA-seq profiling. Results from this data series are shown in Figure 5 of Dawson et al (2020).

2022-02-25 | GSE135615 | GEO

Expression profiles of microRNAs from lactating and non-lactating bovine mammary glands and identification of miRNA related to lactation.

Project description:miRNAs have been implicated in the regulation of milk protein synthesis and development of mammary gland. However, the function of miRNAs in regulating lactation is unclear. Therefore, the elucidation of miRNA expression profiles in MG provides a crucial entry into the understanding of the mechanisms of lactation initiation. Our present work is to examine miRNA expression profiles in bovine mammary gland, and to evaluate miRNAs function through the identification of differentially expressed miRNA between lactation and non-lactation mammary gland. Identification of novel miRNAs highlights the important function of low abundance and less conserved miRNAs. An interaction network of known miRNAs and their target genes around the lactation function was constructed to postulate the functional roles of miRNAs in mammary gland. This integrated analysis provides important information that will inspire further experimental investigations into the field of miRNAs and their targets during lactation.

2012-11-26 | GSE39000 | GEO

Mechanical Loading Differentially Affects Osteocytes in Fibulae from Lactating Mice Compared to Osteocytes in Virgin Mice: Possible Role for Lacuna Size.

Project description: Not available

| S-EPMC6208961 | biostudies-literature

Expression data from Dmp1-GFP sorted osteocytes

Project description:Estrogens are well known steroid hormones necessary to maintain bone health. In addition, mechanical loading, which estrogen signaling may intersect with the Wnt/β-catenin pathway, is also essential for bone health. As osteocytes are known as the major mechanosensory cells embedded in mineralized bone matrix, osteocyte ERα deletion mice (ERαΔOcy/ΔOcy) were generated by mating ERα floxed mice with Dmp1-Cre mice to determine functions of ERα in osteocytes. Trabecular bone mineral density of female, but not male ERαΔOcy/ΔOcy mice was significantly decreased. Bone formation parameters in ERαΔOcy/ΔOcy were significantly decreased while osteoclast parameters were unchanged. This suggests that ERα in osteocytes exerts osteoprotective function by positively controlling bone formation. To identify potential targets of ERα, gene array analysis of Dmp1-GFP osteocytes FACS sorted from ERαΔOcy/ΔOcy and control mice was performed. Expression of Mdk and Sostdc1, both known inhibitors of Wnt, were significantly increased without alteration of the mature osteocyte marker Sost or β-catenin. Hindlimb unloading exacerbated the trabecular bone loss, but surprisingly cortical bone was resistant. These studies show that ERα in osteocytes has osteoprotective effects in trabecular bone through regulating expression of Wnt antagonists, but conversely plays a negative role in cortical bone loss due to unloading.

2013-12-12 | GSE41997 | GEO

Mapping the response of human osteocytes in native matrix to mechanical loading using RNA sequencing

Project description:Aim: To identify differentially expressed genes by mapping the response of human primary osteocytes in their native matrix to mechanical loading using RNA sequencing.

2023-01-30 | GSE220630 | GEO

Mus musculus

Project description:Expression data from osteocytes in virgin,lactating and post lactation mice

| PRJNA131005 | ENA

Expression data from Dmp1-GFP sorted osteocytes

Project description:Estrogens are well known steroid hormones necessary to maintain bone health. In addition, mechanical loading, which estrogen signaling may intersect with the Wnt/Î²-catenin pathway, is also essential for bone health. As osteocytes are known as the major mechanosensory cells embedded in mineralized bone matrix, osteocyte ERÎ± deletion mice (ERÎ±ÎOcy/ÎOcy) were generated by mating ERÎ± floxed mice with Dmp1-Cre mice to determine functions of ERÎ± in osteocytes. Trabecular bone mineral density of female, but not male ERÎ±ÎOcy/ÎOcy mice was significantly decreased. Bone formation parameters in ERÎ±ÎOcy/ÎOcy were significantly decreased while osteoclast parameters were unchanged. This suggests that ERÎ± in osteocytes exerts osteoprotective function by positively controlling bone formation. To identify potential targets of ERÎ±, gene array analysis of Dmp1-GFP osteocytes FACS sorted from ERÎ±ÎOcy/ÎOcy and control mice was performed. Expression of Mdk and Sostdc1, both known inhibitors of Wnt, were significantly increased without alteration of the mature osteocyte marker Sost or Î²-catenin. Hindlimb unloading exacerbated the trabecular bone loss, but surprisingly cortical bone was resistant. These studies show that ERÎ± in osteocytes has osteoprotective effects in trabecular bone through regulating expression of Wnt antagonists, but conversely plays a negative role in cortical bone loss due to unloading. Wild type and osteocyte-specific Estrogen Receptor alpha knock-out mice were generated. The number of both genotypes of mice was three. Calvarial osteocytes of both genotypes harboring Dmp1-GFP were extracted by sequential enzymatic digestion, followed by FACS Aria sorting and total RNAs were purified for Affymetix GeneChip microarray analysis without pooling.

2013-12-12 | E-GEOD-41997 | biostudies-arrayexpress

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