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Induction of retinal degeneration in a crab by light and okadaic acid in vitro: comparison with the Drosophila light-dependent retinal degeneration mutant w rdgBKS222.

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Retinae of the crab Leptograpsus which had been maintained on a 12-h light/12-h dark cycle were cultured in vitro and exposed to 1 microM okadaic acid (OKA) at 0.75 h before light onset. Control retinae were subjected to the same routine and sampled at the same times without OKA treatment. At the

Microtubule stabilization by peloruside A and paclitaxel rescues degenerating neurons from okadaic acid-induced tau phosphorylation.

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Many cellular organelles must travel long distances in neurons to perform their specific functions, and this transport is highly dependent on the microtubule network within the axon. Hyperphosphorylation of microtubule-associated tau protein destabilizes microtubules and leads to neuronal cell

Triterpenic Acids from Potentilla parvifolia and Their Protective Effects against Okadaic Acid Induced Neurotoxicity in Differentiated SH-SY5Y Cells.

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Six triterpenic acids were separated and purified from the ethyl acetate extractive fraction of ethanol extracts of Potentilla parvifolia FISCH. using a variety of chromatographic methods. The neuroprotective effects of these triterpenoids were investigated in the present study, in which the okadaic

Structural integrity of the Golgi stack is essential for normal secretory functions of rat parotid acinar cells: effects of brefeldin A and okadaic acid.

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We examined the effects of specific inhibitors, brefeldin A (BFA) and okadaic acid (OA), on the ultrastructural organization of the Golgi apparatus and distributions of amylase, Golgi-associated proteins, and cathepsin D in the rat parotid acinar cells. BFA induced a rapid regression of the Golgi

Changes in DNA binding pattern of transcription factor YY1 in neuronal degeneration.

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Molecular events under the neuronal degeneration are widely studied but still not defined. Here we compared the effects of both excitotoxic and apoptotic insults on the DNA binding profile of multifunctional transcription factor YY1 protein in cultured cerebellar granule neurons. We report that

Okadaic acid-induced upregulation of nitrotyrosine and heme oxygenase-1 in rat cortical neuron cultures.

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Hyperphosphorylation of tau is a characteristic feature of the neurodegenerative pathology in Alzheimer's disease (AD). Okadaic acid (OA) is currently used in models of AD research to increase the phosphorylation of tau. Using immunocytochemistry and fluorescent study, we found that markers of

Okadaic acid induces JNK activation, bim overexpression and mitochondrial dysfunction in cultured rat cortical neurons.

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Apoptosis via tau phosphorylation has been implicated in the selective neuronal losses seen in Alzheimer's disease (AD). Previous studies in vivo and in cultured neurons have shown that okadaic acid (OA) evokes tau phosphorylation to initiate a neurodegeneration that resembles the pathogenesis of

Swiss mice CD1 fed on mussels contaminated by okadaic acid and yessotoxins: effects on thymus and spleen.

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The toxicity of okadaic acid (OA) and yessotoxins (YTXs) was studied in mice orally fed on (i) OA (17.80+/-2.41 microg/kg) for 24 h and mouse feed for 24 h; (ii) OA (17.2+/-2.13 microg/kg) plus YTXs (1.30+/-0.12 mg/kg) for 24 h and mouse feed for 24 h; (iii) OA (18.88+/-1.86 microg/kg) plus YTXs

Involvement of phosphorylation in doxorubicin-mediated myofibril degeneration. An immunofluorescence microscopy analysis.

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Loss of myofilaments has been observed in both adaptive cardiac responses (i.e., hypertrophy) as well as in chemotheraputic use of antineoplastic drugs with cardiotoxic side effects (i.e., doxorubicin). An understanding of the degenerative process is a prerequisite for determining approaches to

Okadaic Acid and Hypoxia Induced Dementia Model of Alzheimer's Type in Rats.

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Alzheimer's disease (AD) is the most common cause of progressive decline of memory function in aged humans. To study about a disease mechanism and progression, animal models for the specific disease are needed. For AD, although highly valid animal models exist, none of the existing models

Inactivation of GSK-3beta in okadaic acid-induced neurodegeneration: relevance to Alzheimer's disease.

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Hyperphosphorylation of tau is a characteristic feature of the neurodegenerative pathology in Alzheimer's disease (AD). Okadaic acid is used as a research model of AD to increase the tau phosphorylation and neuronal death. Using Western blotting, we found that the amounts of activated PKB[pS-473]

Okadaic acid, a protein phosphatase inhibitor, inhibits nerve growth factor-directed neurite outgrowth in PC12 cells.

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The biochemical mechanisms involved in neurite outgrowth in response to nerve growth factor (NGF) have yet to be completely resolved. Several recent studies have demonstrated that protein kinase activity plays a critical role in neurite outgrowth. However, little information exists about the role of

Hyperphosphorylation and accumulation of neurofilament proteins in Alzheimer disease brain and in okadaic acid-treated SY5Y cells.

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We investigated the role of neurofilament (NF) proteins in Alzheimer disease (AD) neurofibrillary degeneration. The levels and degree of phosphorylation of NF proteins in AD neocortex were determined by Western blots developed with a panel of phosphorylation-dependent NF antibodies. Levels of all

Proteasome inhibition stabilizes tau inclusions in oligodendroglial cells that occur after treatment with okadaic acid.

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Tau-positive inclusions in oligodendrocytes are consistent neuropathological features of corticobasal degeneration, progressive supranuclear palsy, and frontotemporal dementias with Parkinsonism linked to chromosome 17. Here we show by immunohistochemistry that tau-positive oligodendroglial

An okadaic acid-induced model of tauopathy and cognitive deficiency.

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Alzheimer's disease (AD) is a progressive neurodegenerative disease that causes cognitive and behavioral deterioration in the elderly. Neurofibrillary tangles (NFTs) are one of the pathological hallmarks of AD that has been shown to correlate positively with the severity of dementia in the neocortex

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