Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Molecular characterization of immortalization of human MSCs by a combination of p53 knockdown and TERT overexpression

ABSTRACT: Gene expression profile of p53 knockdown MSCs or p53 knockdown+TERT MSCs was compared with that of control MSCs. Our data show p53 knockdown prolongs the lifespan of MSCs, and a combination of p53 knockdown and TERT overexpression is sufficient to immortalize MSCs. The results provide important information about the molecular basis underlying p53 knockdown in MSCs and immortalization-related genes of MSCs. Total RNA obtained from p53 knockdown MSCs or p53 knockdown+TERT MSCs from three patients were compared with control MSCs.

ORGANISM(S): Homo sapiens

SUBMITTER: Tongming Liu

PROVIDER: E-GEOD-28546 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

ACCESS DATA

Similar Datasets

Project description:Rationale and Objectives: Cellular therapies are hampered by poor survival and growth of grafts. We recently showed that the survival and repairing capacity of transplanted adult cells may be improved by co-expression of the anti-senescence telomerase reverse transcriptase (TERT) and anti-apoptotic myocardin (MYOCD). The current study aimed at testing whether forced co-expression of TERT and MYOCD improves post-infarct revascularization and tissue repair by adipose tissue-derived mesenchymal stromal cells (AT-MSCs). Methods: We transplanted AT-MSCs engineered to overexpress MYOCD and TERT in a murine model of acute myocardial infarction (AMI). We analyzed the immunoregulatory properties of AT-MSCs on post-AMI. We characterized in vitro and in vivo paracrine effects of AT-MSCs and their interactions with murine cardiospheres (CSps), all as parts of their reparative repertoire. Results: When transplanted into infarcted hearts of C57BL/6 mice, “rejuvenated” AT-MSCs overexpressing TERT and MYOCD (rAT-MSCs) decreased fibrosis and the intrafibrotic CD3 and B220 lymphocyte infiltration, and increased arteriolar density as well as ejection fraction compared with saline or mock-transduced AT-MSCs. These effects were accompanied by increased numbers of Ki-67+ and CD117+ cells, and the expression of cardiac actin and β-myosin heavy chain within the infarcted hearts. Both rAT-MSCs and their conditioned medium (CM) stimulated intracellular Ca2+ flux in CSps. CSp-derived cells had increased survival when preconditioned with CM or exosome-enriched fraction (Exo+) from rAT-MSCs and then exposed to simulated ischemia/reperfusion. Proteomic analysis of rAT-MSCs-Exo+ predicted the activation of vascular development and the inhibition of immune cell trafficking. Elevated concentration of miR-320a, miR-150-5p and miR-126-3p associated with regulation of apoptosis and vasculogenesis was confirmed in rAT-MSCs-Exo+. Conclusions: rAT-MSCs promote vasculogenesis and cell survival and reduce post-AMI inflammatory responses in a murine model of AMI. An integrated experimental and computational analysis revealed that Exo+ is the active component of the paracrine secretion by rAT-MSCs, with pro-angiogenic and pro-survival activities.

Project description:We have previously reported that the deficiency of p53 alone or in combination with Rb (Rb-/- p53-/-) in adipose-derived MSCs (ASCs) promotes leiomyosarcoma-like tumors in vivo. Here, we hypothesized that the source of MSCs and/or the cell differentiation stage could determine the phenotype of sarcoma development. To investigate whether there is a link between the source of MSCs and sarcoma phenotype, we generated p53-/- and Rb-/-p53-/- MSCs from bone marrow (BM-MSCs). Both genotypes of BM-MSCs initiated leiomyosarcoma formation similar to p53-/- and Rb-/-p53-/- ASCs. In addition, gene expression profiling revealed a link between p53- or Rb-p53-deficient BM-MSCs and ASCs and muscle-associated sarcomagenesis. These data suggest that the tissue source of MSC does not seem a crucial factor in the development of a particular sarcoma phenotype. To analyze whether the differentiation stage defines the sarcoma phenotype, BM-MSCs and ASCs were induced to differentiate towards the osteogenic lineage, and both p53 and Rb were excised using Cre-expressing adenovectors at different stages along osteogenic differentiation. Regardless of the level of osteogenic commitment, the inactivation of Rb and p53 in BM-MSC-derived, but not in ASC-derived, osteogenic progenitors gave rise to osteosarcoma-like tumors which could be serially transplanted. This indicates that the osteogenic differentiation stage of BM-MSCs imposes the phenotype of in vivo sarcoma development, and that BM-MSC-derived osteogenic progenitors rather than undifferentiated BM-MSCs, undifferentiated ASCs or ASC-derived osteogenic progenitors, represent the cell of origin for osteosarcoma development. To analyse whether the BM-MSC and Fat-MSC (ASC) differentiation stage may define the sarcoma phenotype, RbloxP/loxPp53loxP/loxP BM-MSCs and ASCs were induced to differentiate towards the osteogenic lineage and both Rb and p53 were excised with adenoviral vectors expressing the Cre-recombinase gene (Ad-CMV-Cre) at different stages (day 0 and 10) along osteogenic differentiation. NSG mice were inoculated subcutaneously with 5M-CM-^W10^6 mutant cells. Animals were killed when tumors reached 1 cm3 or 150 days after infusion. Some of the obtained tumors were mechanically disaggregated to establish ex vivo MSC-transformed cell lines. Gene expression analysis was performed using: WT BM-MSCs and ASCs, Rb-/-p53-/- BM-MSCs and ASCs previously differentiated to the osteogenic lineage for 10 days and a tumor cell line derived from p53-/-Rb-/- BM-MSC differentiated to the osteogenic lineage for 10 days.

Dataset Information

Molecular characterization of immortalization of human MSCs by a combination of p53 knockdown and TERT overexpression

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

Tweets