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Glutathione peroxidase (GPX) activity in blood of ewes on farms in different scrapie categories in Iceland.
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BACKGROUND
Preliminary studies indicated decreased glutathione peroxidase (GPX) activity in blood of ewes on scrapie-afflicted farms. Other studies have shown decreased GPX activity in brain of prion-infected mice and in prion-infected cells in vitro. The aim of this study was to examine the GPX
Alteration of free radical metabolism in the brain of mice infected with scrapie agent.
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Alteration of free radical metabolism in the mouse brain by scrapie infection was evaluated. The infection of mice with scrapie agent, 87V strain, slightly increased the activities of catalase and glutathione-S-transferase, while it had no effect on glutathione peroxidase, glutathione reductase, and
Overexpression of active Syrian golden hamster prion protein PrPc as a glutathione S-transferase fusion in heterologous systems.
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This article describes a procedure which permits for the first time the isolation of the prion protein PrPc from the Syrian golden hamster in heterologous systems. Using a glutathione S-transferase (GST) fusion approach, milligram amounts of stable, soluble, and homogeneous GST::PrPc protein were
Activation of mitogen-activated protein kinases in hamster brains infected with 263K scrapie agent.
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We investigated the expression, activation and distribution of c-Jun N-terminal kinases (JNKs), p38 mitogen-activated protein kinases (p38 MAPKs) and extracellular signal-regulated kinases (ERKs), using western blotting and immunohistochemistry, in the brains of hamsters infected with 263K scrapie
Genetic markers in Herdwick sheep: no correlation with succeptibility or resistance to experimental scrapie.
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Genetic markers were studied in Herdwick sheep, bred at Compton, with special reference to genetically selected lines which differ in susceptibility or resistance to experimentally produced scrapie. There were no correlations between susceptibility to the disease and albumin, pre-albumin, esterase
Activation of RidA chaperone function by N-chlorination.
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Escherichia coli RidA is a member of a structurally conserved, yet functionally highly diverse protein family involved in translation inhibition (human), Hsp90-like chaperone activity (fruit fly) and enamine/imine deamination (Salmonella enterica). Here, we show that E. coli RidA modified with HOCl
Mitochondrial dysfunction induced by oxidative stress in the brains of hamsters infected with the 263 K scrapie agent.
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Scrapie, one of the prion diseases, is a transmissible neurodegenerative disease of sheep and other animals. Clinical symptoms of prion diseases are characterized by a long latent period, followed by progressive ataxia, tremor, and death. To study the induction of neurodegeneration during scrapie
Novel approaches in diagnosis and therapy of Creutzfeldt-Jakob disease.
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The scrapie prion protein, PrP(Sc), as well as its peptide fragment, PrP106-126, are toxic on neuronal cells, resulting in cell death by an apoptotic, rather than necrotic mechanism. The apoptotic process of neuronal cells induced by prion protein supports diagnosis and offers potential targets for
Selective prion protein binding to synaptic components is modulated by oxidative and nitrosative changes induced by copper(II) and peroxynitrite in cholinergic synaptosomes, unveiling a role for calcineurin B and thioredoxin.
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Choline acetyltransferase (ChAT) and choline transport are decreased after nitrosative stress. ChAT activity is altered in scrapie-infected neurons, where oxidative stress develops. Cellular prion protein (PrPc) may play a neuroprotective function in participating in the redox control of neuronal
Recombinant prion protein rPrP27-30 from Syrian golden hamster reveals proteinase K sensitivity.
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PrP27-30 represents the protease-resistant core of the prion protein and was found to be the main component in Scrapie prion preparations. Recombinant (r) PrP27-30 corresponding to aa 90-231 from the Syrian golden hamster prion protein was expressed as a fusion with GST in E. coli and secreted from
Expression in E. coli and purification of recombinant fragments of wild type and mutant human prion protein.
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Prion diseases are fatal neurodegenerative disorders of the CNS of men and animals, characterized by spongiform degeneration of the CNS, astrogliosis and deposition of amyloid into the brain. The conversion of a cellular glycoprotein (the prion protein, PrP(C)) into an altered isoform (the prion
Structure of thermal polymers of amino acids.
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When glutamic acid is a predominant amino acid in a thermally polymerized mixture of amino acids, pyro Glu is exclusively found at the N-terminal end of the poly-amino acid polymer. It probably initiates the polymerization process. Lysine-containing polymers will probably contain epsilon
RNA aptamers specifically interact with the prion protein PrP.
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We have isolated RNA aptamers which are directed against the recombinant Syrian golden hamster prion protein rPrP23-231 (rPrPc) fused to glutathione S-transferase (GST). The aptamers did not recognize the fusion partner GST or the fusion protein GST::rPrP90-231 (rPrP27-30), which lacks 67 amino
Reactive oxygen species (ROS)-mediated beta-cleavage of the prion protein in the mechanism of the cellular response to oxidative stress.
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The PrP(C) [cellular isoform of PrP (prion protein)] can undergo a conformational conversion to produce a proteinase-resistant form PrP(Sc) (scrapie isoform of PrP), a step critical for the development of prion disease. Although essential for disease progression, the normal cellular function of
Immunological characterization of the sheep prion protein expressed as fusion proteins in Escherichia coli.
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The prion protein (PrP) from sheep was produced in large quantities of entire protein in Escherichia coli after fusion with a carboxy-terminal hexahistidine sequence. In contrast, amino-terminal fusion with glutathione S-transferase (GST) revealed a high susceptibility toward cleavage of the
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