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medulloblastoma/hypoxia
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Downregulation of uPA/uPAR inhibits intermittent hypoxia-induced epithelial-mesenchymal transition (EMT) in DAOY and D283 medulloblastoma cells.
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Hypoxia is known to induce overexpression of the urokinase plasminogen activator (uPA) and its receptor (uPAR) and thus overexpression promotes uPAR-mediated survival signaling in various cancers. Moreover, hypoxia/ overexpression of uPAR in cancer cells promote the epithelial-mesenchymal transition
Hypoxia increases chemoresistance in human medulloblastoma DAOY cells via hypoxia‑inducible factor 1α‑mediated downregulation of the CYP2B6, CYP3A4 and CYP3A5 enzymes and inhibition of cell proliferation.
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Medulloblastomas are among the most frequently diagnosed pediatric solid tumors, and drug resistance remains as the principal cause of treatment failure. Hypoxia and the subsequent activation of hypoxia‑inducible factor 1α (HIF‑1α) are considered key factors in modulating drug antitumor
Interaction of hypoxia-inducible factor-1α and Notch signaling regulates medulloblastoma precursor proliferation and fate.
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Medulloblastoma (MDB) is the most common brain malignancy of childhood. It is currently thought that MDB arises from aberrantly functioning stem cells in the cerebellum that fail to maintain proper control of self-renewal. Additionally, it has been reported that MDB cells display higher endogenous
Daoy medulloblastoma cells that express CD133 are radioresistant relative to CD133- cells, and the CD133+ sector is enlarged by hypoxia.
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OBJECTIVE
Primary medulloblastoma and glioblastoma multiforme tumor cells that express the surface marker CD133 are believed to be enriched for brain tumor stem cells because of their unique ability to initiate or reconstitute tumors in immunodeficient mice. This study sought to characterize the
Fenretinide cytotoxicity for Ewing's sarcoma and primitive neuroectodermal tumor cell lines is decreased by hypoxia and synergistically enhanced by ceramide modulators.
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Patients with disseminated Ewing's family of tumors (ESFT) often experience drug-resistant relapse. We hypothesize that targeting minimal residual disease with the cytotoxic retinoid N-(4-hydroxyphenyl) retinamide (4-HPR; fenretinide) may decrease relapse. We determined the following: (a) 4-HPR
Aspartyl-(asparaginyl) beta-hydroxylase, hypoxia-inducible factor-alpha and Notch cross-talk in regulating neuronal motility.
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Aspartyl-(Asparginyl)-β-Hydroxylase (AAH) promotes cell motility by hydroxylating Notch. Insulin and insulin-like growth factor, type 1 (IGF-I) stimulate AAH through Erk MAPK and phosphoinositol-3-kinase-Akt (PI3K-Akt). However, hypoxia/oxidative stress may also regulate AAH. Hypoxia inducible
Immunoexpression patterns for Hypoxia-inducible Factor-1α and von Hippel-Lindau protein, in relation to Hsp90, of human brain tumors.
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The pathogenesis of many tumors, including brain tumors, has been associated with hypoxia, which induces the transcriptional activity of hypoxia-inducible Factor-1α (HIF-1α). HIF-1α is normally degradated by the von Hippel-Lindau protein (pVHL) but, in hypoxia, pVHL/HIF-1α interaction is inhibited
An Unusual Combination of Mirror-Image Dextrocardia with Familial Medulloblastoma: Is There a Histogenetic Relationship?
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BACKGROUND
The occurrence of medulloblastoma in the absence of hereditary syndromes is rare. Dextrocardia with situs inversus is also called mirror-image dextrocardia. A combination of mirror-image dextrocardia with medulloblastoma has not been reported previously. To the best of our knowledge, this
Nuclear translocation of Hand-1 acts as a molecular switch to regulate vascular radiosensitivity in medulloblastoma tumors: the protein uPAR is a cytoplasmic sequestration factor for Hand-1.
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Urokinase-type plasminogen activator receptor (uPAR) is overexpressed in the tumor-stromal invasive microenvironment in many human cancers, including medulloblastoma. The role of uPAR in tumor progression and angiogenesis has been well characterized. Previously, in medulloblastoma cells, we showed
Unexpected and sudden death due to undiagnosed medulloblastoma in twin pregnancy: A case report.
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The authors describe an unusual case of sudden and unexpected death caused by a medulloblastoma in a woman aged 28, native of South America, at the 33rd week of twin pregnancy, with neurological signs appeared a month before death. The initial symptoms were attributed to epiphenomena of pregnancy.
The effect of alpha-v integrin inhibition on the malignant characteristics of medulloblastoma.
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OBJECTIVE
Hypoxia induces an aggressive phenotype in some brain tumors in part due to hypoxia-inducible factor-1α (HIF-1α) and integrin expression. The importance of hypoxia in medulloblastoma is unclear and the interaction of HIF-1α and c-Myc in medulloblastoma has not been explored. The objective
Reactive Oxygen Species Signaling Promotes Hypoxia-Inducible Factor 1α Stabilization in Sonic Hedgehog-Driven Cerebellar Progenitor Cell Proliferation.
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Cerebellar development is a highly regulated process involving numerous factors acting with high specificity, both temporally and by location. Part of this process involves extensive proliferation of cerebellar granule neuron precursors (CGNPs) induced by Sonic Hedgehog (SHH) signaling, but
Laminin-adherent versus suspension-non-adherent cell culture conditions for the isolation of cancer stem cells in the DAOY medulloblastoma cell line.
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Medulloblastoma (MB) is a highly malignant tumor of childhood. MB seems to be initiated and maintained by a small group of cells, known as cancer stem cells (CSCs). The CSC hypothesis suggests that a subset of tumor cells is able to proliferate, sustain the tumor, and develop chemoresistance, all of
Pharmacological inhibition of LSD1 activity blocks REST-dependent medulloblastoma cell migration.
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BACKGROUND
Medulloblastoma (MB) is the most common malignant brain tumor in children. Current problems in the clinic include metastasis, recurrence, and treatment-related sequelae that highlight the need for targeted therapies. Epigenetic perturbations are an established hallmark of human MB and
Pediatric medulloblastoma xenografts including molecular subgroup 3 and CD133+ and CD15+ cells are sensitive to killing by oncolytic herpes simplex viruses.
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BACKGROUND
Childhood medulloblastoma is associated with significant morbidity and mortality that is compounded by neurotoxicity for the developing brain caused by current therapies, including surgery, craniospinal radiation, and chemotherapy. Innate therapeutic resistance of some aggressive
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