Similar Datasets
Project description:Primary mMSCs were cultured in control medium (Con), containing DMEM and 15% FBS, or were subjeucted to osteogenic induction (OI) for 2 days. RNA was isolated using RNeasy Mini Kit (Qiagen, Cat#74104) from three biological replicates of primary MSCs from Prx1Cre;Kdm4bf/f mice and control mice. Total RNA was then purified with Dynabeads™ mRNA Purification Kit (Invitrogen, Cat#61006). RNA-seq libraries were constructed using Stranded RNA-Seq Library Preparation Kit (Kapa Biosystems, Cat#KK8400), and sequenced using an illumina HiSeq 3000 sequencer at the Technology Center for Genomics & Bioinformatics (TCGB) core at UCLA.
2021-02-10 | GSE104258 | GEO
Project description:Mesenchymal stem/stromal cells (MSCs) are multipotent progenitor cells with multilineage differentiation potentials. We previously reported histone demethylases KDM4B promoted osteogenesis and inhibited adipogenesis of human MSCs. To identify genome-wide enrichments of KDM4B and the changes in H3K9me3 marks when loss of KDM4B, Primary MSCs were isolated from Prx1Cre; Kdm4bf/f mice and control mice. ChIP-seq assay was performed using KDM4B, H3K9me3 and H3 antibody, respectively.
2021-02-10 | GSE104257 | GEO
Project description:Loss of KDM4B exacerbates bone-fat imbalance and mesenchymal stromal cell exhaustion in skeletal aging
| PRJNA412178 | ENA
Project description:Loss of KDM4B Exacerbates Bone-Fat Imbalance and Mesenchymal Stem Cell Exhaustion in Skeletal Aging [ChIP-seq]
| PRJNA412202 | ENA
Project description:Loss of KDM4B Exacerbates Bone-Fat Imbalance and Mesenchymal Stem Cell Exhaustion in Skeletal Aging [RNA-seq]
| PRJNA412206 | ENA
Project description:Mesenchymal stem/stromal cells (MSCs) are the predominant source of bone and adipose tissue in adult bone marrow and play a critical role in skeletal homeostasis. Age-induced changes in bone marrow favor adipogenesis over osteogenesis leading to skeletal involution and increased marrow adiposity so pathways that prevent MSC aging are potential therapeutic targets for treating age-related bone diseases. Here, we show that inositol hexakisphosphate kinase 1 (Ip6k1) deletion in mice increases MSC yields from marrow and enhances cell growth and survival ex vivo. In response to the appropriate stimuli, Ip6k1-/- versus Ip6k1+/+ MSCs also exhibit enhanced osteogenesis and hematopoiesis-supporting activity and reduced adipogenic differentiation. Mechanistic-based studies revealed that Ip6k1-/- MSCs express higher MDM2 and lower p53 protein levels resulting in lower intrinsic mitochondrial reactive oxygen species (ROS) levels as compared to Ip6k1+/+ MSCs, but both populations upregulate mitochondrial ROS to similar extents in response to oxygen-induced stress. Finally, we show that mice fed a high fat diet exhibit reduced trabecular bone volume, and that pharmacological inhibition of IP6K1 using a pan-IP6K inhibitor largely reversed this phenotype while increasing MSC yields from bone marrow. Together, these findings reveal an important role for IP6K1 in regulating MSC fitness and differentiation fate. Unlike therapeutic interventions that target peroxisome proliferator-activated receptor gamma and leptin receptor activity, which yield detrimental side effects including increased fracture risk and altered feeding behavior, respectively, inhibition of IP6K1 maintains insulin sensitivity and prevents obesity while preserving bone integrity. Therefore, IP6K1 inhibitors may represent more effective insulin sensitizers due to their bone sparing properties. Stem Cells 2017;35:1973-1983.
| S-EPMC5533188 | biostudies-literature
Project description:Impairment of glucose (Glu) uptake and storage by skeletal muscle is a prime risk factor for the development of metabolic diseases. Heterogeneous nuclear ribonucleoprotein A1 (hnRNP A1) is a highly abundant RNA-binding protein that has been implicated in diverse cellular functions. The aim of this study was to investigate the function of hnRNP A1 on muscle tissue insulin sensitivity and systemic Glu homeostasis. Our results showed that conditional deletion of hnRNP A1 in the muscle gave rise to a severe insulin resistance phenotype in mice fed a high-fat diet (HFD). Conditional knockout mice fed a HFD showed exacerbated obesity, insulin resistance, and hepatic steatosis. In vitro interference of hnRNP A1 in C2C12 myotubes impaired insulin signal transduction and inhibited Glu uptake, whereas hnRNP A1 overexpression in C2C12 myotubes protected against insulin resistance induced by supraphysiological concentrations of insulin. The expression and stability of glycogen synthase (gys1) mRNA were also decreased in the absence of hnRNP A1. Mechanistically, hnRNP A1 interacted with gys1 and stabilized its mRNA, thereby promoting glycogen synthesis and maintaining the insulin sensitivity in muscle tissue. Taken together, our findings are the first to show that reduced expression of hnRNP A1 in skeletal muscle affects the metabolic properties and systemic insulin sensitivity by inhibiting glycogen synthesis.
| S-EPMC7232127 | biostudies-literature
Project description:Mesenchymal stem/stromal cells (MSCs) are a reservoir for tissue homeostasis and repair that age during organismal aging. Beside the fundamental in vivo role of MSCs, they have also emerged in the last years as extremely promising therapeutic agents for a wide variety of clinical conditions. MSC use frequently requires in vitro expansion, thus exposing cells to replicative senescence. Aging of MSCs (both in vivo and in vitro) can affect not only their replicative potential, but also their properties, like immunomodulation and secretory profile, thus possibly compromising their therapeutic effect. It is therefore of critical importance to unveil the underlying mechanisms of MSC senescence and to define shared methods to assess MSC aging status. The present review will focus on current scientific knowledge about MSC aging mechanisms, control and effects, including possible anti-aging treatments.
| S-EPMC7072652 | biostudies-literature
Project description:Cellular reprogramming forcing the expression of pluripotency markers can reverse aging of cells, but how molecular mechanisms through which reprogrammed cells alter aging-related cellular activities still remains largely unclear. In this study, we reprogrammed human synovial fluid-derived mesenchymal stem cells (MSCs) into induced pluripotent stem cells (iPSCs) using six reprogramming factors and reverted the iPSCs back to MSCs, as an approach to cell rejuvenation. Using the parental and reprogrammed MSCs as control nonrejuvenated and rejuvenated cells, respectively, for comparative analysis, we found that aging-related activities were greatly reduced in reprogrammed MSCs compared with those in their parental lines, indicating reversal of cell aging. Global transcriptome analysis revealed differences in activities of regulatory networks associated with inflammation and proliferation. Mechanistically, we demonstrated that, compared with control cells, the expression of GATA binding protein 6 (GATA6) in reprogrammed cells was attenuated, resulting in an increase in the activity of sonic hedgehog signaling and the expression level of downstream forkhead box P1 (FOXP1), in turn ameliorating cellular hallmarks of aging. Lower levels of GATA6 expression were also found in cells harvested from younger mice or lower passage cultures. Our findings suggest that GATA6 is a critical regulator increased in aged MSCs that controls the downstream sonic hedgehog signaling and FOXP1 pathway to modulate cellular senescence and aging-related activities.
| S-EPMC7772271 | biostudies-literature
Project description:Chronic high-fat diet (HFD) consumption not only promotes obesity and insulin resistance, but also causes bone loss through mechanisms that are not well understood. Here, we fed wild-type CD-1 mice either chow or a HFD (43% of energy from fat) for 18 weeks; HFD-fed mice exhibited decreased trabecular volume (-28%) and cortical thickness (-14%) compared to chow-fed mice. In HFD-fed mice, bone loss was due to reduced bone formation and mineral apposition, without obvious effects on bone resorption. HFD feeding also increased skeletal expression of sclerostin and caused deterioration of the osteocyte lacunocanalicular network (LCN). In mice fed HFD, skeletal glucocorticoid signaling was activated relative to chow-fed mice, independent of serum corticosterone concentrations. We therefore examined whether skeletal glucocorticoid signaling was necessary for HFD-induced bone loss, using transgenic mice lacking glucocorticoid signaling in osteoblasts and osteocytes (HSD2OB/OCY-tg mice). In HSD2OB/OCY-tg mice, bone formation and mineral apposition rates were not suppressed by HFD, and bone loss was significantly attenuated. Interestingly, in HSD2OB/OCY-tg mice fed HFD, both Wnt signaling (less sclerostin induction, increased β-catenin expression) and glucose uptake were significantly increased, relative to diet- and genotype-matched controls. The osteocyte LCN remained intact in HFD-fed HSD2OB/OCY-tg mice. When fed a HFD, HSD2OB/OCY-tg mice also increased their energy expenditure and were protected against obesity, insulin resistance, and dyslipidemia. Therefore, glucocorticoid signaling in osteoblasts and osteocytes contributes to the suppression of bone formation in HFD-fed mice. Skeletal glucocorticoid signaling is also an important determinant of glucose uptake in bone, which influences the whole-body metabolic response to HFD.
| S-EPMC8408138 | biostudies-literature