astrocytoma/phosphatase

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An acid phosphatase in the plasma membranes of human astrocytoma showing marked specificity toward phosphotyrosine protein.

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The plasma membrane from the human tumor astrocytoma contains an active acid phosphatase activity based on hydrolysis of p-nitrophenyl phosphate. Other acid phosphatase substrates--beta-glycerophosphate, O-phosphorylcholine, and 5'-AMP--are not hydrolyzed significantly. The phosphatase activity is

Expression of phosphatase and tensin homolog, epidermal growth factor receptor, and Ki-67 in astrocytoma: A prospective study in a tertiary care hospital.

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BACKGROUND Though the tumor grade is a key factor influencing the choice of therapies, particularly determining the use of adjuvant radiation and specific chemotherapy protocols, role of abnormality in phosphatase and tensin homolog (PTEN) expression and variation in epidermal growth factor receptor

Demonstration of separate phosphotyrosyl- and phosphoseryl- histone phosphatase activities in the plasma membranes of a human astrocytoma.

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A plasma membrane preparation from a human astrocytoma contained p-nitrophenyl phosphate (pNPP), phosphotyrosyl histone, and phosphoseryl histone hydrolysis activities. The pNPPase and phosphotyrosyl histone phosphatase activities were inhibited by vanadate, whereas the phosphoseryl histone

Cytokine-induced transcription of protein-tyrosine-phosphatases in human astrocytoma cells.

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Interleukin-1 (IL-1) and Tumor Necrosis Factor-a (TNFalpha) are potent mediators of inflammatory reactions in the brain. Although much is known about the effects of IL-1 on expression of secretory proteins, few studies have addressed the question of a selective, IL-1-dependent expression of genes

R3F, a novel membrane-associated glycogen targeting subunit of protein phosphatase 1 regulates glycogen synthase in astrocytoma cells in response to glucose and extracellular signals.

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Abnormal regulation of brain glycogen metabolism is believed to underlie insulin-induced hypoglycaemia, which may be serious or fatal in diabetic patients on insulin therapy. A key regulator of glycogen levels is glycogen targeted protein phosphatase 1 (PP1), which dephosphorylates and activates

FAS associated phosphatase (FAP-1) blocks apoptosis of astrocytomas through dephosphorylation of FAS.

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Astrocytomas are the most common primary tumor of the adult human central nervous system. Despite efforts to develop more effective clinical treatment strategies, median survival time for patients with the most severe form of astrocytoma, glioblastoma multiforme (GBM), remains about one year.

Expression and function of the receptor protein tyrosine phosphatase zeta and its ligand pleiotrophin in human astrocytomas.

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Using subtractive cloning combined with cDNA array analysis, we previously identified the genes encoding for the protein tyrosine phosphatase zeta/receptor-type protein tyrosine phosphatase beta (PTPzeta/RPTPbeta) and its ligand pleiotrophin (PTN) as overexpressed in human glioblastomas compared to

Akt-dependent proapoptotic effects of dietary restriction on late-stage management of a phosphatase and tensin homologue/tuberous sclerosis complex 2-deficient mouse astrocytoma.

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OBJECTIVE Malignant astrocytomas exhibit constitutive Akt phosphorylation due to reduced phosphatase and tensin homologue (PTEN) tumor suppressor expression or to increased growth factor receptor tyrosine kinase activation. Many astrocytomas are also tuberous sclerosis complex 2 (TSC2) protein

Preliminary observations on genetic alterations in pilocytic astrocytomas associated with neurofibromatosis 1.

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Neurofibromatosis 1 (NF1) is an autosomal dominant disorder that predisposes sufferers to various forms of neoplasia. Among affected individuals, 15%-20% develop astrocytomas, especially pilocytic astrocytomas (PA), which are benign and classified as grade I by the World Health Organization. They

Fas (Apo-1, CD95) receptor expression in childhood astrocytomas. Is it a marker of the major apoptotic pathway or a signaling receptor for immune escape of neoplastic cells?

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Apoptosis is a physiological process wherein the cell initiates a sequence of events culminating in the fragmentation of its DNA, nuclear collapse, and finally disintegration of the cell into small, membrane-bound apoptotic bodies. Expression of Fas (APO-1, CD95) Receptor (FasR) and programmed or

CDC25B, Ki-67, and p53 expressions in reactive gliosis and astrocytomas.

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OBJECTIVE To investigate the expression of CDC25B, which is a member of the cyclin-dependent kinase activating phosphatase family, in diffuse astrocytoma (DA), anaplastic astrocytoma (AA), glioblastoma multiforme (GBM), pilocytic astrocytoma (PA) and reactive gliosis (RG). Also, to study the

MAGE-1, a cancer/testis-antigen, expression in childhood astrocytomas as an indicator of tumor progression.

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During the last decade, the aberrant expression of normal testicular proteins in neoplastically transformed cells became common knowledge. Cancer/testis-antigens (CTAs) represent a novel family of immunogenic proteins. The MAGE genes were initially analyzed from melanomas and turned out to have an

Immunophenotyping of childhood astrocytomas with a library of monoclonal antibodies.

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Immunophenotype (IP) analysis of 14 childhood glial tumors was performed with a library of 16 monoclonal antibodies (MAbs) using biotin-streptavidin-alkaline phosphatase immunohistochemical detection technique. Presence of glial or neuronal differentiated cells within the tumors was evaluated with

Soluble protein tyrosine phosphatase receptor type Z (PTPRZ) in cerebrospinal fluid is a potential diagnostic marker for glioma

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Background: High-grade glioma is the most pervasive and lethal of all brain malignancies. Despite advances in imaging technologies, discriminating between gliomas and other brain diseases such as multiple sclerosis (MS) often requires

A morphologic study of the vasculature of malignant gliomas using thick celloidin sections and alkaline phosphatase stain.

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The combination of 100 microm thick celloidin sections and alkaline phosphatase (AP) enzyme histochemistry of the vascular endothelium offers a greatly enhanced, 3D morphologic perspective and reveals intricate details of the vasculature of brain. A study of tumor specimens obtained at craniotomy

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