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medulloblastoma/phosphatase
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Ceramide accumulation precedes caspase-dependent apoptosis in CHP-100 neuroepithelioma cells exposed to the protein phosphatase inhibitor okadaic acid.
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The protein phosphatase inhibitor okadaic acid (OA) dose-dependently induced apoptosis in CHP-100 neuroepithelioma cells when administered for 24 h at concentrations ranging from 10 - 100 nM. Apoptosis was largely, albeit not completely, dependent on cystein protease (caspase) activation. CPP32
p53 Function is Compromised by Inhibitor 2 of Phosphatase 2A in Sonic Hedgehog Medulloblastoma.
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Medulloblastomas, the most common malignant pediatric brain tumors, have been genetically defined into four subclasses, namely WNT-activated, Sonic Hedgehog (SHH)-activated, Group 3, and Group 4. Approximately 30% of medulloblastomas have aberrant SHH signaling and thus are referred to as
Chondrocytic differentiation of peripheral neuroectodermal tumor cell line in nude mouse xenograft.
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We have established a cell line (KU-SN) from a peripheral neuroectodermal tumor originating in the left scapula of a 4-year-old girl. The original tumor was immunoreactive with antibodies for neurofilament proteins, neuron-specific enolase, vimentin, S100 protein, and beta 2-microglobulin. Dense
Immunophenotype profile of childhood medulloblastomas and supratentorial primitive neuroectodermal tumors using 16 monoclonal antibodies.
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Immunophenotype analysis of 17 childhood medulloblastoma (MED) and supratentorial primitive neuroectodermal tumors (SPNET) was performed on frozen sections using 16 monoclonal antibodies (MoAb) with the biotin-streptavidin alkaline phosphatase immunohistochemical technique. Neuroectodermal
Effects of microRNA-494 on proliferation, migration, invasion, and apoptosis of medulloblastoma cells by mediating c-myc through the p38 MAPK signaling pathway.
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Medulloblastoma (MB) is the most prevalent brain tumor that occurs during childhood and originates from cerebellar granule cell precursors. Based on recent studies, the differential expression of several microRNAs is involved in MB, while the role of microRNA-494 (miR-494) in MB remains unclear.
Fas (APO-1, CD95) receptor expression and new options for immunotherapy in childhood medulloblastomas.
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Central nervous system (CNS) tumors are the most common solid neoplasms in children. Medulloblastomas (MEDs) resemble embryonic neuroectodermal stem cells and their immature, uncommitted neuronal and glial progeny. Apoptosis is a basic physiological process wherein the cell initiates a sequence of
Significant differences in the matrix metalloproteinase expression profiles of spontaneous medulloblastomas/primitive neuroectodermal tumors as compared with their xenografted, established tumor cell line derived counterparts.
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Matrix metalloproteinases (MMP) are a family of zinc-dependent enzymes which degrade various components of the extracellular matrix (ECM) and play an important role in facilitating neoplastic cell invasion and metastasis. Structural changes in the extracellular matrix are necessary for cell
Phosphate-dependent and independent neurofilament protein epitopes are expressed throughout the cell cycle in human medulloblastoma (D283 MED) cells.
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The low (NF-L) and middle (NF-M) molecular weight (Mr) neurofilament (NF) subunits are expressed before the high (NF-H) Mr NF subunit in embryonic neurons. Thereafter, NF-M attains its mature state of phosphorylation more rapidly than does NF-H. However, little is known about NF subunit expression
Ubiquitin ligases and medulloblastoma: genetic markers of the four consensus subgroups identified through transcriptome datasets
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The ubiquitin proteasome system regulates key cellular processes in normal and in cancer cells. Herein, we review published data on the role of ubiquitin ligases in the four major subgroups of medulloblastoma (MB). While conventional literature serves as an initial source of information on cellular
Differential expression of somatostatin receptors, P44/42 MAPK, and mTOR activation in medulloblastomas and primitive neuroectodermal tumors.
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Recently, somatostatin receptors (SSR) have been identified on medulloblastomas and proposed as a new target for chemotherapy including inhibitory somatostatin analogs. Activation of SSRs inhibit growth, in part, by activating phosphatases that dephosphorylate/deactivate growth stimulatory signaling
Differential Expression of Genes for Ubiquitin Ligases in Medulloblastoma Subtypes.
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Using publically available datasets on gene expression in medulloblastoma (MB) subtypes, we selected genes for ubiquitin ligases and identified statistically those that best predicted each of the four major MB subgroups as separate disease entities. We identify a gene coding for an ubiquitin ligase,
Medulloblastoma metastatic to the marrow. Report of four cases and review of the literature.
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Medulloblastoma is a malignant cerebellar tumor seen primarily in the pediatric age group that has a known ability to metastasize extraneurally. The skeleton is the most common site of extraneural metastases, but metastases to the bone marrow can also occur. Four cases of medulloblastoma metastatic
Generalized osteoblastic bony metastases from medulloblastoma.
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Osteoblastic bony metastases were observed in a case of medulloblastoma three years after surgery and radiation treatment. There was clinical response to COP therapy (cytoxin, oncovin, prednisone). Radiographic and isotopic bone scan study showed uniform increase in bone density. Serum calcium and
Caspase inhibition shifts neuroepithelioma cell response to okadaic acid from apoptosis to an apoptotic-like form of death.
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We have previously shown that the protein phosphatase inhibitor okadaic acid (OA) induces caspase-3 activation and apoptosis in CHP-100 human neuroepithelioma cells. Herein we provide a more general picture of the effects brought about by OA in this system, also investigating whether caspase
Reduced bone mineral density in long-term survivors of medulloblastoma.
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Bone mineral density (BMD) reaches a peak at approximately 30 years of age, and may be influenced by radiotherapy before completion of skeletal maturation. Regional BMD has been measured using dual energy X-Ray absorptiometry (DEXA) in adults following craniospinal irradiation for medulloblastoma
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