Mus musculus
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA240889 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR1186380.fastq.gz | Fastqsanger.gz | |||
| SRR1186381.fastq.gz | Fastqsanger.gz | |||
| SRR1186382.fastq.gz | Fastqsanger.gz | |||
| SRR1186383.fastq.gz | Fastqsanger.gz | |||
| SRR1186384.fastq.gz | Fastqsanger.gz |
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Project description:The accumulation of reactive oxygen species (ROS) is linked to several cardiovascular pathologies; it is also associated with cell cycle exit by nenonatal cardiomyocytes, a key limiting factor in the regenerative capacity of the adult mammalian heart. BMI1 is a component of the polycomb complex 1, which is linked to adult multipotent progenitors, and is also an important partner in DNA repair and redox regulation. Here we show that high BMI1 expression is associated with a cardiac Sca1+ progenitor subpopulation with low ROS levels. In homeostasis, BMI1 represses cell-fate genes, including a cardiogenic differentiation program. Persistent oxidative damage nonetheless modified BMI1 activity in vivo, by derepressing canonical target genes in favor of their antioxidant and anticlastogenic functions. This derepression induced cardiac progenitor proliferation and differentiation, and thus increased its contribution to mature cardiac progeny. This redox-mediated mechanism is not restricted to damage situations, and we report ROS-associated differentiation of cardiac progenitors in steady state. These findings demonstrate how redox status influences the adult cardiac progenitor response, and identifies a redox-mediated BMI1 function with potential implications in adult cardiac turnover.
2018-01-01 | GSE92700 | GEO
Project description:We have found the existence of a Bmi1+ population in the adult heart contributing to the organ low-rate turnover and repair with the generation of new cardiomyocytes. We show that the Bmi1+ population is a sub-population of the cardiac Sca-1+ progenitor cells. We have analyzed the gene profile by deep-sequencing (RNA-Seq) of Bmi1+ and Sca-1+Bmi1- cells in homeostatic heart condition. On the other hand, we have compared gene profile by deep-sequencing (RNA-Seq) of Bmi1+ cells in homeostatic condition versus Bmi1+ cells 5 days after myocardial infarction (MI). Analysis of RNA-Seq data revealed a differential expression signature between both subsets of cardiac stem/progenitors cells in homeostatic condition and also differences between Bmi1+ cells after AMI versus homeostatic condition.
2017-02-14 | GSE55754 | GEO
Project description:The mammalian heart undergoes major transitions during postnatal life to acquire the physiological properties of an adult organ. Postnatal life imposes numerous adaptations including electrophysiological, structural and metabolic maturation of cardiomyocytes1, which occur coincident with loss of proliferative capacity and regenerative potential2,3. The discovery of key upstream drivers of cardiomyocyte maturation and cell cycle arrest remains one of the most important unanswered questions in cardiac biology. Discovery of these drivers would facilitate current attempts to promote cardiomyocyte maturation in vitro for drug discovery and to de-differentiate adult cardiomyocytes in vivo for regenerative medicine. A recent study has suggested that the shift from a low oxygen environment in utero towards a high oxygen environment after birth acts as a key trigger for cardiomyocyte cell cycle exit4. Moreover, it was recently demonstrated that proliferative adult cardiomyocytes reside in a hypoxic niche5 and that exposure of adult mice to gradual hypoxemia is sufficient to drive cell cycle re-entry and regeneration following infarction6. However, it is currently unclear whether postnatal changes in oxygen tension or the associated shifts in cardiomyocyte metabolism are sufficient to promote maturation and cell cycle arrest as human pluripotent stem cell (hPSC)-derived cardiomyocytes fail to mature when cultured at 21% oxygen7,8. There are considerable changes in metabolic substrate provision during early postnatal life. The mammalian heart relies on high concentrations of carbohydrates and the presence of insulin in utero but later switches to fatty acid dominated substrates present in milk and low insulin levels post-birth9. In order to adapt to these changes in substrates, cardiomyocytes upregulate the genes required for fatty acid oxidation after birth10. The importance of these metabolic adaptations for cardiomyocyte maturation has been difficult to study because genetic disruption of fatty acid oxidation components in vivo can have a broad range of negative health impacts11. Therefore, there is a need to develop alternative approaches for studying the impact of cardiomyocyte metabolism on the maturation process. hPSCs are now widely used for the generation of defined human somatic cell types, including cardiomyocytes. These cardiomyocytes have now been used extensively for developmental studies, drug screening, disease modeling, and heart repair. However, lack of maturity and inappropriate responses to pharmacological agents have been identified as limitations in 2D or embryoid body based differentiation strategies12. To improve maturity of hPSC-derived cardiomyocytes, long-term culture can be used13, although long-term cultures may not be amenable to high-throughput screening applications and adult-like maturity is still not achieved14. In an effort to better simulate heart muscle structure and function, cardiac tissue engineering to form 3D engineered heart tissue has been used15-19. However, despite these recent advances in human cardiac tissue engineering, cardiac tissues derived from hPSC still lack many features of fully mature adult heart tissue20. Moreover, engineered heart tissue fabrication, culture, mechanical loading and pacing protocols, and analysis methods using organ baths are costly, labor intensive, and the multiple handling steps induce variability. In order to facilitate higher-throughput experiments, platforms for engineered heart tissue production have been miniaturized, however, screening experiments using semi-automated force of contraction analyses have only been published in 24-well plate formats21. Therefore, we developed a novel 96-well device, the heart dynamometer (Heart-Dyno), for high-throughput functional screening of human cardiac organoids (hCOs) to facilitate screening on a larger scale. The Heart-Dyno is designed to facilitate automated formation of dense muscle bundles from minimal cells and reagents while also facilitating culture and automated force of contraction analysis without any tissue handling. Using the Heart-Dyno, we define serum-free 3D culture conditions that promote structural, electrophysiological, metabolic and proliferative maturation of hPSC-derived cardiac organoids. Furthermore, we uncover a metabolic mechanism governing cardiomyocyte cell cycle arrest through repression of a β-catenin and YAP1 dependent signalling.
2017-11-21 | PXD005736 | Pride
Project description:Re-activating quiescent adult epicardium represents a potential therapeutic approach for human cardiac regeneration. However, the exact molecular differences between inactive adult and active foetal epicardium are not known. Here, we combined foetal and adult human hearts for the first time using single-cell and single-nuclei RNA sequencing, and compared epicardial cells from both stages. We found a migratory fibroblast-like epicardial population only in the foetal heart and foetal epicardium expressed angiogenic gene programs, while the adult epicardium was solely mesothelial and immune-responsive. Furthermore, we predicted that adult hearts may still receive foetal epicardial paracrine communication, including WNT-signalling with endocardium, reinforcing the validity of regenerative strategies that administer or reactivate epicardial cells in situ. Finally, we explained graft efficacy of our human embryonic stem-cell derived epicardium model, by noting its similarity to human foetal epicardium. Overall, our study defines epicardial programs of regenerative angiogenesis absent in adult hearts, contextualises animal studies, and defines epicardial states required for effective human heart regeneration.
2022-10-31 | GSE216019 | GEO
Project description:Mounting clinical evidence indicates severe pathological consequences from COVID-19 in the heart. Here we examine cardiac susceptibility and response to SARS-CoV-2 using human induced pluripotent stem cell-derived cardiomyocytes, cardiac fibroblasts, and endothelial cells. Of these cell types, SARS-CoV-2 can only productively infect cardiomyocytes, and does so via an endolysosomal mechanism. Transcriptomic profiling of infected cells revealed changes in protein homeostasis and cardiomyocyte contractility, and activation of innate immune response pathways. In addition, we observed a striking pattern of myofibrillar fragmentation, with specific cleavage at the M-line. Numerous cardiomyocytes also lacked nuclear DNA in tissue culture experiments and COVID-19 autopsy specimens. These novel cardiac pathologies induced by SARS-CoV-2 strongly motivate the development of targeted cardioprotective strategies to prevent acute and long-term heart failure in COVID-19 patients.
2020-09-21 | GSE156754 | GEO
Project description:By contrast with mammals, adult zebrafish have a high capacity to regenerate damaged or lost myocardium through proliferation of spared cardiomyocytes. The epicardial sheet covering the heart is activated by injury and aids muscle regeneration through paracrine effects and as a multipotent cell source, and has received recent attention as a target in cardiac repair strategies. While it is recognized that epicardium is required for muscle regeneration and itself has high regenerative potential, the extent of cellular heterogeneity within epicardial tissue is largely unexplored. In this study, we performed transcriptome analysis on dozens of epicardial lineage cells purified from zebrafish harboring a transgenic reporter for the pan-epicardial gene tcf21. Hierarchical clustering analysis suggested the presence of at least three epicardial cell subsets defined by expression signatures. We validated many new pan-epicardial and epicardial markers by alternative expression assays. Additionally, we explored the function of the scaffolding protein and main component of caveolae, caveolin-1 (cav1), which was present in each epicardial subset. In BAC transgenic zebrafish, cav1 regulatory sequences drove strong expression in ostensibly all epicardial cells and in coronary vascular endothelial cells. Moreover, cav1 mutant zebrafish generated by genome editing showed grossly normal heart development and adult cardiac anatomy, but displayed profound defects in injury-induced cardiomyocyte proliferation and heart regeneration. Our study defines a new platform for the discovery of epicardial lineage markers, genetic tools, and mechanisms of heart regeneration. Deep sequencing of isolated single epicardial cells
2015-12-15 | E-GEOD-75583 | biostudies-arrayexpress
Project description:Mammalian heart development is built on highly conserved molecular mechanisms with polygenetic perturbations resulting in a spectrum of congenital heart diseases (CHD). However, the transcriptional landscape of cardiogenic ontogeny that regulates proper cardiogenesis remains largely based on candidate-gene approaches. Herein, we designed a time-course transcriptome analysis to investigate the genome-wide expression profile of innate murine cardiogenesis ranging from embryonic stem cells to adult cardiac structures. This comprehensive analysis generated temporal and spatial expression profiles, prioritized stage-specific gene functions, and mapped the dynamic transcriptome of cardiogenesis to curated pathways. Reconciling the bioinformatics of the congenital heart disease interactome, we deconstructed disease-centric regulatory networks encoded within this cardiogenic atlas to reveal stage-specific developmental disturbances clustered on epithelial-to-mesenchymal transition (EMT), BMP regulation, NF-AT signaling, TGFb-dependent induction, and Notch signaling. Therefore, this cardiogenic transcriptional landscape defines the time-dependent expression of cardiac ontogeny and prioritizes regulatory networks at the interface between health and disease. To interrogate the temporal and spatial expression profiles across the entire genome during mammalian heart development, we designed a time-course microarray experiment using the mouse model at defined stages of cardiogenesis, starting with embryonic stem cells (ESC, R1 stem cell line), early embryonic developmental stages: E7.5 whole embryos, E8.5 heart tubes, left and right ventricle tissues at E9.5, E12.5, E14.5, E18.5 to 3 days after birth (D3) and adult heart (Figure 1A). At each time point, microarray experiments were performed on triplicate biological samples. Starting at E9.5, tissue samples from left ventricles (LV) and right ventricles (RV) were microdissected for RNA purification and microarray analysis to determine spatially differential gene expression between LV and RV during heart development.
2014-05-19 | E-GEOD-51483 | biostudies-arrayexpress
Project description:Distinct Mammary Stem Cells Orchestrate the Long-term Homeostasis of Adult Mammary Gland
| PRJNA1055945 | ENA
Project description:In this study, we combined a genome-wide analysis of the Polycomb protein Bmi1 and an in vivo RNAi screening to identify critical targets whose repression in neural progenitor and Malignant Glioma cells enables normal and aberrant self-renewal. Bmi1 ChIP-sequencing generated in 2 primary adult mouse Neural Progenitor cell lines, 1 mouse astrocytic cell line, 1 mouse Glioma initiating cell line, and 1 mouse Glioma cell line. In human cell lines, Bmi1 ChIP-seq was performed for foetal Neural Progenitor Cells, and 2 Glioblastoma Stem-like cells. ChIP-seq for AP-1 in one Glioblastoma stem-like cell line. ChIP-sequencing were generated using either Illumina GxII or HiSeq. We have further performed RNA-seq of adult Ink4a/Arf -/-;BMI1or GFP dox-inducible shRNA mNPC with a doxycycline inducible shRNA targeting BMI1 or GFP (as control). These cells were either treated with doxyclyine for 48h to ablate BMI1 and GFP expression or further subjected to short-term differentiation using either BMP4 (10ng/ml or 50ng/ml for 3 or 6hrs), or FBS (1 or 10% for 3 or 6hrs). Additional mouse RNA-seq were performed in two biological replica of adult mouse brains (littermate) with either wild-type FVB background or BMI1 -/-. Finally, we performed RNA-seq in human Glioblastoma stem-like cells (most likely belonging to the mesenchymal GBM subtype) treated with BMP7, Arvanil and doxycycline or EtOH treated as ctrl.
2013-05-21 | E-GEOD-33912 | biostudies-arrayexpress
Project description:This study is associated with the GEO accession GSE216019. Abstract from article: Re-activating quiescent adult epicardium represents a potential therapeutic approach for human cardiac regeneration. However, the exact molecular differences between inactive adult and active foetal epicardium are not known. Here, we combined foetal and adult human hearts for the first time using single-cell and single-nuclei RNA sequencing, and compared epicardial cells from both stages. We found a migratory fibroblast-like epicardial population only in the foetal heart and foetal epicardium expressed angiogenic gene programs, while the adult epicardium was solely mesothelial and immune-responsive. Furthermore, we predicted that adult hearts may still receive foetal epicardial paracrine communication, including WNT-signalling with endocardium, reinforcing the validity of regenerative strategies that administer or reactivate epicardial cells in situ. Finally, we explained graft efficacy of our human embryonic stem-cell derived epicardium model, by noting its similarity to human foetal epicardium. Overall, our study defines epicardial programs of regenerative angiogenesis absent in adult hearts, contextualises animal studies, and defines epicardial endpoints required for effective human heart regeneration.
2022-10-31 | GSE216177 | GEO