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The microenvironment-specific transformation of adult stem cells models malignant triton tumors.

ABSTRACT: Here, we demonstrated the differentiation potential of murine muscle-derived stem/progenitor cells (MDSPCs) toward myogenic, neuronal, and glial lineages. MDSPCs, following transplantation into a critical-sized sciatic nerve defect in mice, showed full regeneration with complete functional recovery of the injured peripheral nerve at 6 weeks post-implantation. However, several weeks after regeneration of the sciatic nerve, neoplastic growths were observed. The resulting tumors were malignant peripheral nerve sheath tumors (MPNSTs) with rhabdomyoblastic differentiation, expressing myogenic, neurogenic, and glial markers, common markers of human malignant triton tumors (MTTs). No signs of tumorigenesis were observed 17 weeks post-implantation of MDSPCs into the gastrocnemius muscles of dystrophic/mdx mice, or 1 year following subcutaneous or intravenous injection. While MDSPCs were not oncogenic in nature, the neoplasias were composed almost entirely of donor cells. Furthermore, cells isolated from the tumors were serially transplantable, generating tumors when reimplanted into mice. However, this transformation could be abrogated by differentiation of the cells toward the neurogenic lineage prior to implantation. These results establish that MDSPCs participated in the regeneration of the injured peripheral nerve but transformed in a microenvironment- and time-dependent manner, when they likely received concomitant neurogenic and myogenic differentiation signals. This microenvironment-specific transformation provides a useful mouse model for human MTTs and potentially some insight into the origins of this disease.

SUBMITTER: Lavasani M

PROVIDER: S-EPMC3857244 | biostudies-literature | 2013

REPOSITORIES: biostudies-literature

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The microenvironment-specific transformation of adult stem cells models malignant triton tumors.

Lavasani Mitra M Pollett Jonathan B JB Usas Arvydas A Thompson Seth D SD Pollett Aaron F AF Huard Johnny J

PloS one 20131209 12

Here, we demonstrated the differentiation potential of murine muscle-derived stem/progenitor cells (MDSPCs) toward myogenic, neuronal, and glial lineages. MDSPCs, following transplantation into a critical-sized sciatic nerve defect in mice, showed full regeneration with complete functional recovery of the injured peripheral nerve at 6 weeks post-implantation. However, several weeks after regeneration of the sciatic nerve, neoplastic growths were observed. The resulting tumors were malignant peri ...[more]

PMID: 24349213

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Project description:BackgroundArsenic is a carcinogen that targets the urogenital system, including the prostate. Although the mechanisms for arsenic-induced carcinogenesis are undefined, arsenic drives overaccumulation of stem cells and cancer stem cells (CSCs) in vivo and in vitro, indicating that these cells are a key target population. Disruption of stem cell population dynamics may be critical to acquisition of cancer phenotype. We tested the hypothesis that prostate stem cells have a survival selection advantage during arsenic exposure that favors their accumulation and facilitates their malignant transformation.MethodsInnate and acquired resistance to acute (24-72 hours of exposure) and chronic (6 weeks of exposure) arsenite-induced cytolethality and apoptosis were assessed in a human prostate stem cell line (WPE-stem) and the mature parental cell line (RWPE-1). Real-time reverse transcription-polymerase chain reaction and/or Western blot analysis was used to measure the expression of apoptosis-, stress-, and arsenic-related genes. Arsenic-, cadmium-, and N-methyl-N-nitrosourea-induced isogenic malignant transformants of RWPE-1 cells were compared for acquisition of CSC-like qualities by holoclone and sphere formation assays, growth in soft agar, and expression of CSC biomarkers. All statistical tests were two-sided.ResultsWPE-stem cells showed innate resistance to arsenic-induced cytolethality (arsenite concentration lethal to 50% of the cells [LC(50)] = 32.4 microM, 95% confidence interval [CI] = 31.5 to 33.3 muM) and apoptosis compared with parental RWPE-1 cells (LC(50) = 10.4 muM, 95% CI = 7.4 to 13.4 microM). Compared with RWPE-1 cells, WPE-stem cells showed noticeably higher expression of antiapoptotic (ie, BCL2, MT), stress-related (ie, NFE2L2, SOD1, PRODH), and arsenic adaptation (ie, ABCC1, GSTP1) factors and noticeably lower expression of proapoptotic factors (ie, BAX, caspases 3, 7, 8, and 9). WPE-stem cells also showed hyper-adaptability to chronic arsenite exposure (5 microM, 6 weeks) compared with RWPE-1 cells (LC(50) = 94.7 vs 32.1 microM, difference = 62.6 muM, 95% CI = 53.3 to 71.9 muM) at levels that in previous work induced a malignant phenotype in RWPE-1 after 30 weeks of exposure. Quantification of CSC-like cells in isogenic RWPE-1 transformants showed that marked overproduction was unique to a malignant phenotype acquired in response to arsenic exposure but not in response to cadmium or N-methyl-N-nitrosourea exposure.ConclusionsAn apparent stem cell survival advantage with regard to arsenic causes selection during malignant transformation that manifests itself as an overabundance of CSC-like cells specifically after arsenic-driven acquisition of malignant phenotype. The increased resistance to apoptosis and arsenite hyper-adaptability of WPE-stem cells suggests that arsenite transformation of RWPE-1 cells involves an increase in the number of CSC-like cells.

Project description:BackgroundThe recent development of dendritic cell (DC)-based immunotherapy has resulted in advances in glioblastoma multiforme (GBM) treatment. However, the cell fate of DCs in the GBM microenvironment, especially in microenvironments in which glioma stem cell (GSCs)-mediated remodeling has resulted in highly immunosuppressive conditions, has not yet been fully investigated.MethodsObserved the interaction between GSCs and primary cultured DCs in a dual-color tracing model, monoclonal and continuously passaged highly proliferative DCs, and named transformed DCs (t-DCs). The expression of DC-specific surface markers was analyzed using RT-PCR, chromosome karyotype, and flow cytometry. The expression of long pentraxin 3 (PTX3) and its transcription factor zinc finger protein 148 (ZNF148) in t-DCs was detected using qRT-PCR and western blot. CCK8 and transwell assays were conducted to assess the effect of ZNF148 and PTX3 on the proliferation, migration, and invasion of t-DCs. Bioinformatics analysis, dual-luciferase reporter assay, and chromatin immunoprecipitation (ChIP)-qPCR assay were used to explore the relation between ZNF148 and PTX3.ResultsTransformed DCs (t-DCs) still expressed DC-specific surface markers, namely, CD80 and CD11c, and immune-related costimulatory molecules, namely, CD80, CD86, CD40, and ICAM-1. However, the expression levels of these molecules in t-DCs decreased moderately compared to those in naive DCs. Stable overexpression of PTX3 further promoted the proliferation and migration of t-DCs in vitro, decreased the expression of costimulatory molecules, and increased the tumorigenicity of t-DCs in vivo. The transcription factor zinc finger protein 148 (ZNF148) was directly bound to the PTX3 promoter region and enhanced PTX3 expression. Downregulation of ZNF148 significantly decreased PTX3 expression and reduced the proliferation and migration of t-DCs. Overexpression of ZNF148 significantly increased PTX3 expression and promoted the proliferation and migration of t-DCs, achieving the same biological effects as PTX3 overexpression in t-DCs. Simultaneously, the downregulation of ZNF148 partially reversed the effect of PTX3 overexpression in t-DCs.ConclusionThe ZNF148/PTX3 axis played an important role in regulating the malignant transformation of DCs after cross-talk with GSCs, and this axis may serve as a new target for sensitizing GBM to DC-based immunotherapy.

Project description:BackgroundExisting evidence has shown that mesenchymal stem cells (MSCs) can undergo malignant transformation, which is a serious limitation of MSC-based therapies. Therefore, it is necessary to monitor malignant transformation of MSCs via a noninvasive imaging method. Although reporter gene-based magnetic resonance imaging (MRI) has been successfully applied to longitudinally monitor MSCs, this technique cannot distinguish the cells before and after malignant transformation. Herein, we investigated the feasibility of using a tumor-specific promoter to drive reporter gene expression for MRI detection of the malignant transformation of MSCs.MethodsThe reporter gene ferritin heavy chain (FTH1) was modified by adding a promoter from the tumor-specific gene progression elevated gene-3 (PEG3) and transduced into MSCs to obtain MSCs-PEG3-FTH1. Cells were induced to undergo malignant transformation via indirect coculture with C6 glioma cells, and these transformed cells were named MTMSCs-PEG3-FTH1. Western blot analysis of FTH1 expression, Prussian blue staining and transmission electron microscopy (TEM) to detect intracellular iron, and MRI to detect signal changes were performed before and after malignant transformation. Then, the cells before and after malignant transformation were inoculated subcutaneously into nude mice, and MRI was performed to observe the signal changes in the xenografts.ResultsAfter induction of malignant transformation, MTMSCs demonstrated tumor-like features in morphology, proliferation, migration, and invasion. FTH1 expression was significantly increased in MTMSCs-PEG3-FTH1 compared with MSCs-PEG3-FTH1. Prussian blue staining and TEM showed a large amount of iron particles in MTMSCs-PEG3-FTH1 but a minimal amount in MSCs-PEG3-FTH1. MRI demonstrated that the T2 value was significantly decreased in MTMSCs-PEG3-FTH1 compared with MSCs-PEG3-FTH1. In vivo, mass formation was observed in the MTMSCs-PEG3-FTH1 group but not the MSCs-PEG3-FTH1 group. T2-weighted MRI showed a significant signal decrease, which was correlated with iron accumulation in the tissue mass.ConclusionsWe developed a novel MRI model based on FTH1 reporter gene expression driven by the tumor-specific PEG3 promoter. This approach could be applied to sensitively detect the occurrence of MSC malignant transformation.

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The microenvironment-specific transformation of adult stem cells models malignant triton tumors.

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The microenvironment-specific transformation of adult stem cells models malignant triton tumors.

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