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okadaic acid/некроза
Веза се чува у привремену меморију
Страна 1 од 183 резултати
Okadaic acid induces down-modulation and shedding of tumor necrosis factor receptors. Comparison with another tumor promoter, phorbol ester.
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Protein kinase C modulates the receptor for tumor necrosis factor (TNF) in wide variety of different cell types. However, there is no information about the role of phosphatases in the regulation of the TNF receptor. In this report, we investigated the effect of okadaic acid, an inhibitor of
Okadaic acid mimics multiple changes in early protein phosphorylation and gene expression induced by tumor necrosis factor or interleukin-1.
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Okadaic acid, a phosphatase inhibitor from a marine organism, mimics tumor necrosis factor/interleukin-1 (TNF/IL-1) in inducing changes in early cellular protein phosphorylation. A total of approximately 116 proteins exhibit significant and concordant changes in phosphorylation or dephosphorylation
Okadaic acid is a potent inducer of AP-1, NF-kappa B, and tumor necrosis factor-alpha in human B lymphocytes.
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Treatment of human B lymphocytes with an optimal concentration of okadaic acid, an inhibitor of phosphatases 1 and 2A, resulted in the induction of the transcription factor, AP-1 and a marked increase in NF-kappa B levels. In contrast, no effect on the levels of the octamer binding proteins, Oct-1
Tumor necrosis factor-alpha, a new tumor promoter, engendered by biochemical studies of okadaic acid.
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Okadaic acid is a potent tumor promoter on mouse skin and in rat glandular stomach, and an inhibitor of PP-1 and PP-2A. How okadaic acid biochemically induces tumor promotion in these tissues was reviewed. Okadaic acid bound to a catalytic subunit of PP-1 and PP-2A and induced hyperphosphorylation
Cell- and gene-specific interactions between signal transduction pathways revealed by okadaic acid. Studies on the plasminogen activating system.
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The potential contribution of serine/threonine-specific protein phosphatases in the transcriptional regulation of plasminogen activator and plasminogen activator inhibitor gene expression was explored in human HT-1080 fibrosarcoma and U-937 monocyte-like cells using okadaic acid, a potent and
Cellular resistance to vincristine suppresses NF-kappa B activation and apoptosis but enhances c-Jun-NH2-terminal protein kinase activation by tumor necrosis.
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Tumor necrosis factor (TNF) is a pleiotropic cytokine that potentiates the cytotoxic effects of chemotherapeutic drugs. Although emergence of resistance to chemotherapeutic drugs is a major problem in cancer therapy, its mechanism is incompletely understood. Recently, activation of a nuclear
Acquisition of cellular resistance to 9-nitro-camptothecin correlates with suppression of transcription factor NF-kappa B activation and potentiation of cytotoxicity by tumor necrosis factor in human histiocytic lymphoma U-937 cells.
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Resistance of tumor cells to chemotherapeutic agents is a major problem in cancer therapy. Continuous exposure of human histiocytic lymphoma U-937 cells to 9-nitro-camptothecin (9NC), an inhibitor of the nuclear DNA topoisomerase I, induces resistance to this drug. Because of the involvement of the
Dinoflagellate polyether within the yessotoxin, pectenotoxin and okadaic acid toxin groups: characterization, analysis and human health implications.
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Diarrhetic Shellfish Poisoning (DSP) is a specific type of food poisoning, characterized by severe gastrointestinal illness due to the ingestion of filter feeding bivalves contaminated with a specific suite of toxins. It is known that the problem is worldwide and three chemically different groups of
Effects of insulin-like growth factor-1 on okadaic acid-induced apoptosis in SH-SY5Y cells.
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The effects of insulin-like growth factor-1 (IGF-1) on the cytotoxicity and apoptosis induced by okadaic acid (OA) in SH-SY5Y cells were investigated. Cell viability was measured using the MTT (3-(4,5-dimethylthiazolyl-2)-2,-5-diphenyltetrazolium bromide) assay. Early and late apoptosis/necrosis
Inducer-specific regulators of tumor necrosis factor alpha production.
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Novel potent regulators of tumor necrosis factor alpha (TNF-alpha) production by a human promyelocytic leukemia cell line, HL-60, were prepared. All the compounds showed inducer-specific and bidirectional regulation of TNF-alpha production, i.e., they enhanced
Novel biological response modifiers: phthalimides with tumor necrosis factor-alpha production-regulating activity.
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Novel N-substituted phthalimides (2-substituted 1H-isoindole-1,3-diones) were prepared, and their effects on tumor necrosis factor-alpha (TNF-alpha) production by human leukemia cell line HL-60 stimulated with 12-O-tetradecanoylphorbol 13-acetate (TPA) or okadaic acid (OA) were examined. A
Tumor necrosis factor-alpha production-inhibiting activity of phthalimide analogues on human leukemia THP-1 cells and a structure-activity relationship study.
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N-Substituted phthalimides (2-substituted 1H-isoindole-1,3-diones) were prepared and their inhibitory effects on tumor necrosis factor-alpha (TNF-alpha) production by human leukemia cell line THP-1 stimulated with 12-O-tetradecanoylphorbol 13-acetate (TPA) or okadaic acid (OA) were examined. A
Inducer-specific bidirectional regulation by thalidomide and phenylphthalimides of tumor necrosis factor-alpha production.
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Regulation by thalidomide [N(alpha)-phthalimidoglutarimide] of tumor necrosis factor (TNF)-alpha production was found to be inducer-specific. Thalidomide enhances TNF-alpha production by human leukemia HL-60 cells induced with 12-O-tetradecanoylphorbol 13-acetate (TPA), while it inhibits TNF-alpha
Simultaneous 1H PFG-NMR and confocal microscopy of monolayer cell cultures: effects of apoptosis and necrosis on water diffusion and compartmentalization.
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We induced apoptosis and necrosis in monolayer cultures of Chinese hamster ovary cells using okadaic acid and hydrogen peroxide (H2O2), respectively, and examined the effect on water diffusion and compartmentalization using pulsed-field-gradient (PFG) 1H-NMR and simultaneous confocal microscopy. In
In Vitro Analysis of Early Genotoxic and Cytotoxic Effects of Okadaic Acid in Different Cell Types of the Mussel Mytilus galloprovincialis.
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Okadaic acid (OA) is the predominant biotoxin responsible for diarrhetic shellfish poisoning (DSP) syndrome in humans. While its harmful effects have been extensively studied in mammalian cell lines, the impact on marine organisms routinely exposed to OA is still not fully known. Few investigations
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