Project description:To investigate the molecular mechanisms underlying the altered hematopoietic support of mesenchymal stromal cells (MSC) expanded in human platelet lysate (hPL)-supplemented medium, we performed a comprehensive transcriptomic analysis comparing hPL-MSC and fetal bovine serum (FBS)-expanded MSC. MSC from three bone marrow donors were cultured under different adaptation regimens and co-cultured with hematopoietic stem and progenitor cells (HSPC). Transcriptomic analysis revealed distinct gene expression profiles, with 13% of genes differentially expressed between hPL-MSC and FBS-MSC, impacting cell signaling, extracellular matrix, and chemotaxis. Key pathways, including TGF-beta, PI3K-Akt, and Wnt signaling, were altered, affecting MSC-mediated HSPC expansion. hPL-MSC exhibited increased expression of inhibitory factors and reduced expression of promoters of HSPC proliferation, influencing Notch, TGF-β, JAK/STAT, and Wnt regulation. These findings highlight critical molecular interactions in MSC-HSPC co-culture and provide insights for optimizing xeno-free MSC expansion for hematopoietic applications.
Project description:Study designed to explore the effects of endothelial cell/MSC co-culture on individual gene expression profile of each cell type 4 independent samples from each of 4 groups: MSCs cultured alone; Pulmonary endothelial cells cultured alone; MSCs co-cultured with PECs then FACS separated; PECs co-cultured with MSCs then FACS separated
Project description:Increasing longevity and the growing elderly population necessitate a deeper understanding of cellular interactions within the aging microenvironment, particularly those involving mesenchymal stromal cells (MSCs) and endothelial cells (ECs), as their cross-talk is critical for tissue homeostasis and regeneration. However, how endothelial cells differentially respond to young versus senescent MSCs depending on the mode of interaction – whether through extracellular matrix (ECM) deposition, secreted factors, or direct cell-cell contact – remains poorly characterized. This study aims to provide a transcriptomic dataset of endothelial cells following co-culture with young (mitomycin‑untreated) and senescent (mitomycin‑treated) MSCs under three distinct conditions: on MSC‑derived ECM, in MSC‑conditioned medium, and in direct co‑culture. The RNA‑sequencing data will enable comparative analysis of endothelial transcriptional programs modulated by proliferating versus senescent MSCs across different compartments of the MSC-EC niche.
Project description:Mesenchymal stromal cells (MSC) were isolated from human bone marrow. Here, we have compared gene expression profiles of MSC at early and late passages. Long-term culture associated gene expression changes were then correlated with DNA-methylation profiles. The goal of this study was to determine if senescence-associated DNA-methylation (SA-DNAm) changes are reflected by differential gene expression. Overall, genes with SA-DNAm changes (particularly with SA-hypomethylation) were detected at low level and seemed to be scarcely expressed at early and late passages. MSC were isolated from three different donors and culture expanded until replicative senescence. Gene expression profiles were compared at early and late passage using GeneChip Humang Gene 1.0 ST arrays (Affymetrix). Six hybridizations are included in this series.
Project description:Mesenchymal stromal cells (MSC) were isolated from human bone marrow. Here, we have compared gene expression profiles of MSC at early and late passages. Long-term culture associated gene expression changes were then correlated with DNA-methylation profiles. The goal of this study was to determine if senescence-associated DNA-methylation (SA-DNAm) changes are reflected by differential gene expression. Overall, genes with SA-DNAm changes (particularly with SA-hypomethylation) were detected at low level and seemed to be scarcely expressed at early and late passages.
Project description:The gene expression of mouse wt small intestinal epithelium and myofibroblast,3D organoids, both in monoculture and in co-culture, as well as small interstinal adenoma organoids from the Apc+/1638N mouse model, were measured by Affymetrix Mouse Gene 2.1 ST Array.