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Global Gene Changes in Hearts from CardioMRKO Mice

ABSTRACT: Heart failure is one of the leading causes of death in the Western world, and stress is increasingly associated with adverse cardiac outcomes. Glucocorticoids are primary stress hormones that regulate homeostasis through two closely related nuclear receptors, the glucocorticoid receptor (GR) and mineralocorticoid receptor (MR). Cardiomyocytes express both receptors but little is known concerning their coordinated actions in heart physiology and pathology. To examine the in vivo function of glucocorticoid signaling in the heart, we generated mice with cardiomyocyte-specific deletion of GR (cardioGRKO), MR (cardioMRKO), or both GR and MR (cardioGRMRdKO). The cardioMRKO mice exhibited normal heart function whereas the cardioGRKO mice spontaneously developed cardiac hypertrophy and left ventricular systolic dysfunction. Surprisingly, the cardioGRMRdKO mice were protected from cardiac disease. Genome-wide microarrays were performed on isolated hearts from each mouse model to 1) identify genes subject to regulation by GR alone, MR alone, or both GR and MR and 2) identify the genes responsible for the cardiac pathology in the cardioGRKO mice and for the cardioprotection in the cardioGRMRdKO mice.

ORGANISM(S): Mus musculus

PROVIDER: GSE95732 | GEO | 2019/04/17

REPOSITORIES: GEO

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Global Gene Changes in Hearts from CardioGRMRdKO Mice

Project description:Heart failure is one of the leading causes of death in the Western world, and stress is increasingly associated with adverse cardiac outcomes. Glucocorticoids are primary stress hormones that regulate homeostasis through two closely related nuclear receptors, the glucocorticoid receptor (GR) and mineralocorticoid receptor (MR). Cardiomyocytes express both receptors but little is known concerning their coordinated actions in heart physiology and pathology. To examine the in vivo function of glucocorticoid signaling in the heart, we generated mice with cardiomyocyte-specific deletion of GR (cardioGRKO), MR (cardioMRKO), or both GR and MR (cardioGRMRdKO). The cardioMRKO mice exhibited normal heart function whereas the cardioGRKO mice spontaneously developed cardiac hypertrophy and left ventricular systolic dysfunction. Surprisingly, the cardioGRMRdKO mice were protected from cardiac disease. Genome-wide microarrays were performed on isolated hearts from each mouse model to 1) identify genes subject to regulation by GR alone, MR alone, or both GR and MR and 2) identify the genes responsible for the cardiac pathology in the cardioGRKO mice and for the cardioprotection in the cardioGRMRdKO mice.

2019-04-17 | GSE95719 | GEO

Global Gene Changes in Hearts from CardioGRKO Mice

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Gene Changes in Hippocampus from Mice with Conditional Knockout of Hippocampal GR, MR, or both GR and MR

Project description:Glucocorticoids are primary stress hormones that have been implicated in the pathogenesis of cognitive impairments and psychiatric illnesses. The hippocampus expresses high levels of glucocorticoid (GR) and mineralocorticoid receptors (MR) which both bind glucocorticoids. However, the specific and cooperative roles played by GR and MR in mediating the direct actions of stress on the hippocampus are unknown. To elucidate the function of hippocampal GR and MR, we generated mice with conditional knockout of GR (GREmx1-cre), MR (MREmx1-cre), or both GR and MR (GRMREmx1-cre) in the hippocampus. Genome-wide microarrays were performed on RNA isolated from the whole hippocampus to 1) identify genes subject to regulation by GR alone, MR alone, or both GR and MR and 2) identify the genes responsible for the morphological and behavioral phenotypes observed in these mice.

2021-08-04 | GSE149625 | GEO

ChIP-nexus of mineralocorticoid receptors and glucocorticoid receptors in neuroblastoma cells

Project description:Purpose: To compare the binding profiles of mineralocorticoid and glucocorticoid receptors after corticosterone treatment in neuroblastoma cells. Methods: Tagged glucocorticoid receptors (eGFP-rat GR) and mineralocorticoid receptors (mCherry-rat MR) were transiently transfected into Neuro2A mouse neuroblastoma cells and treated with (i) vehicle, (ii) corticosterone 100 nM for 20 mins and (iii) corticosterone 100 nM for 20 mins followed by media repacement twice and 40 mins further incubation in charcoal-stripped serum media. ChIP-nexus samples were prepared in triplicate for deep sequencing using Illumina NextSeq, as well as control samples taken from cell lysates before immunoprecipitation. Sequence data was analyzed and processed for the identification of enriched binding sites, using MACS2, and for the characteristic staggered ChIP-nexus borders, using the MACE pipeline (Wang et al., 2014). Results: Corticosterone-sensitive glucocorticoid receptor (GR) binding sites and mineralocorticoid receptor (MR) binding sites showed considerable overlap, by MACS2 analysis. GR and MR binding sites were highly similar showing recruitment to the same DNA sites, by MACE analysis (Wang et al., 2014). Further analyses showed GR could tether MR to the DNA by GR in a functional manner such that gene expression could be altered by the presence of tethered MR. Conclusions: MR can be recruited to DNA-binding sites by GR, even in the absence of MR DNA-binding. MR can interact in multiple modes at genomic DNA binding sites.

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Molecular signature of mineralocorticoid signalling in cardiomyocytes

Project description:Gene expression analysis of hearts from double transgenic mice with conditional, cardiomyocyte-specific, overexpression of the mineralocorticoid (MR) or of the glucocorticoid receptor (GR). GR-mice vs controls, MR-mice vs controls. GR: 3 sample pools hybridized to 2 microarrays each. MR: 1 sample pool hybridized to 3 microarrays. Microarray contains triplicate spots.

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Molecular signature of mineralocorticoid signalling in cardiomyocytes

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Crosstalk between the glucocorticoid and mineralocorticoid receptor boosts glucocorticoid-induced killing of multiple myeloma cells

Project description:The glucocorticoid receptor (GR) is a crucial drug target in multiple myeloma as its activation with glucocorticoids effectively triggers myeloma cell death. However, as high-dose glucocorticoids are also associated with deleterious side effects, novel approaches are urgently needed to improve GR’s action in myeloma. Here we reveal a functional crosstalk between GR and the mineralocorticoid receptor (MR) that culminates in improved myeloma cell killing. We show that the GR agonist Dexamethasone (Dex) downregulates MR levels in a GR-dependent way in myeloma cells. Co-treatment of Dex with the MR antagonist Spironolactone (Spi) enhances Dex-induced cell killing in primary, newly diagnosed GC-sensitive myeloma cells, while in a relapsed GC-resistant setting, Spi alone induces distinct myeloma cell killing. On a mechanistic level, we find that a GR-MR crosstalk is arising from an endogenous interaction between GR and MR in myeloma cells. Quantitative dimerization assays show that Spi reduces Dex-induced GR-MR heterodimerization and completely abolishes Dex-induced MR MR homodimerization but leaves GR-GR homodimerization intact. Unbiased transcriptomics further reveals that c-myc and many of its target genes are downregulated most by Dex and Spi combined, while proteomics analyses identify that several metabolic hallmarks are modulated most by this combination treatment. Finally, we identified a subset of Dex+Spi downregulated genes and proteins that may predict prognosis in the CoMMpass patient cohort. Our study demonstrates that GR-MR crosstalk is therapeutically relevant in myeloma as it provides novel strategies towards glucocorticoid-based dose-reduction.

2023-10-24 | PXD043635 | Pride

Gene expression data from corticosteroid-treated neonatal rat cardiomyocytes

2009-05-01 | GSE12752 | GEO

Glucocorticoid and Mineralocorticoid Receptor Signaling have Sex-dependent and Independent Effects in Mouse Hippocampus

Project description:Many stress-related neuropsychiatric disorders display pronounced sex differences in their frequency and clinical symptoms. Glucocorticoids are primary stress hormones that have been implicated in the development of these disorders but whether they contribute to the observed sex bias is poorly understood. Glucocorticoids signal through two closely related nuclear receptors, the glucocorticoid (GR) and mineralocorticoid receptor (MR), that are both expressed at high levels in the hippocampus. To investigate the sex-dependent and independent actions of glucocorticoids in the hippocampus, we developed knockout mice lacking hippocampal GR (GREmx1-cre), MR (MREmx1-cre), or both GR and MR (GRMREmx1-cre). Genome-wide microarrays were performed on RNA isolated from the hippocampus of male and female flox control and knockout mice in order to 1) identify genes dysregulated in a sex-dependent and independent manner by a deficiency in GR, MR, or both GR and MR signaling and 2) identify the genes responsible for the sex-dependent and independent phenotypes observed in these mice.

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Transcription profiling of rat neonatal cardiomyocytes treated with corticosteroid

Project description:Recent studies have highlighted the role of adrenal corticosteroid signaling in cardiac physiology and pathophysiology. It is known that glucocorticoids and aldosterone are able to bind glucocorticoid receptor (GR) and mineralocorticoid receptor (MR), and these ligand-receptor interactions are redundant. Therefore, it has been impossible to delineate how these nuclear receptors couple with corticosteroid ligands and differentially regulate gene expression for operation of their distinct functions in the heart. Here, to particularly define the role of GR, we applied ligand-based approach involving GR-specific agonist cortivazol (CVZ) and GR antagonist RU486, and performed microarray analysis using rat neonatal cardiomyocytes. We indicated that glucocorticoids appear to be a major determinant of GR-mediated gene expression when compared with aldosterone. Moreover, expression profiles of these genes highlighted numerous roles of glucocorticoids in various aspects of cardiac physiology. Experiment Overall Design: We analyzed gene expression changes after exposure of cells to corticosterone (COR), aldosterone (ALD), and cortivazol (CVZ) in the absence or presence of GR antagonist RU486. Since our preliminary experiments using several cell lines showed that expression of many GR target genes was induced by glucocorticoids in 3 h and to avoid secondary effects of the products of GR-regulated genes, we in the present study set the time periods of exposure to these ligands as 3 h. DNA microarray experiments were performed twice with the same protocol except for RU486 treatment.

2009-05-11 | E-GEOD-12752 | biostudies-arrayexpress

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