scrapie/tyrosine

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Early changes in tyrosine hydroxylase and glutamate decarboxylase activity in the golden hamster striatum after intracerebral inoculation of the nigrostriatal system with scrapie agent (strain 263 K).

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Unilateral inoculation of hamster substantia nigra (SN) with scrapie agent led to an early decrease in tyrosine hydroxylase (TH) activity in the corresponding striatum, which was detectable by the 5th day. This decrease was accompanied by an increase in glutamate decarboxylase (GAD) observed on the

Changes in tyrosine hydroxylase, glutamic acid decarboxylase and choline acetyltransferase after local microinoculation of scrapie agent into the nigrostriatal system of the golden hamster.

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A microinjection of a homogenate of scrapie agent-infected brain (strain 263 K) into the nigrostriatal system in the golden hamster is followed by the progressive development of the disease which terminates by the death of animals around the 4th month postinoculation. These intracerebral

Increased Src kinase level results in increased protein tyrosine phosphorylation in scrapie-infected neuronal cell lines.

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We have studied how prion infection may affect the Src kinase activity in three different neuronal cell lines, ScGT1 and ScN2a, where ScGT1 were generated in our laboratory. By immunoblotting, using clone 28 - a monoclonal antibody recognizing active Src, we have found a 32+/-6.3% and 75+/-7.7%

Unchanged scrapie pathology in brain tissue of tyrosine kinase Fyn-deficient mice.

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Fyn is a 59-kDa member of the Src family of tyrosine kinases synthesized on cytosolic polysomes and then targeted to the plasma membrane where it clusters in caveolae-like membrane microdomains. The cellular isoform of the prion protein (PrP) has also been identified to be a caveolar constituent and

Extensive degeneration of catecholaminergic neurons to scrapie agent 87V in the brains of IM mice.

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Scrapie is a degenerative disease of the central nervous system of sheep and goats. The causative agent has been passaged to a number of laboratory species, including mice and hamster. Amyloid plaque formation and vacuolation, the signs of senile dementia, are found in the brains of mice infected

Alterations in neurotransmitter-related enzyme activity in scrapie-infected PC12 cells.

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Enzyme activities associated with the neurotransmitter pathways in nerve growth factor-treated, 139A scrapie strain-infected PC12 cells were examined. Since these cells show no morphological alterations during the time of agent replication, any scrapie-induced effects would have to be associated

(1)H NMR brain metabonomics of scrapie exposed sheep.

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While neurochemical metabolite modifications, determined by different techniques, have been diffusely reported in human and mice brains affected by transmissible spongiform encephalopathies (TSEs), this aspect has been little studied in the natural animal hosts with the same pathological conditions

The tyrosine kinase inhibitor imatinib mesylate delays prion neuroinvasion by inhibiting prion propagation in the periphery.

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Prion diseases are fatal neurodegenerative disorders with no effective therapy. A hallmark of prion disease is the conversion of the normal cellular form of prion protein PrP(C) into a disease-associated isoform PrP(Sc). The authors recently have shown that a tyrosine kinase inhibitor, imatinib

Increased expression of phospholipase D1 in the brains of scrapie-infected mice.

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Mitochondrial dysfunction and free radical-induced oxidative damage are critical factors in the pathogenesis of neurodegenerative diseases. Recently, phospholipid breakdown by phospholipase D (PLD) has been recognized as an important signalling pathway in the nervous system. Here, we examined the

Inhibition of prion propagation in scrapie-infected mouse neuroblastoma cell lines using mouse monoclonal antibodies against prion protein.

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We screened six mouse monoclonal antibodies (mAbs) against prion protein (PrP), which were previously established in our laboratory, for inhibitory activity against PrP(Sc)-accumulation in scrapie-infected cell lines and identified two mAbs, 3S9 and 2H9, as possessing this inhibitory activity. mAb

Close interactions between sympathetic neural fibres and follicular dendritic cells network are not altered in Peyer's patches and spleen of C57BL/6 mice during the preclinical stage of 139A scrapie infection.

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During preclinical stage of prion diseases, secondary lymphoid organs seem to play an important role in prion amplification prior the invasion of the associated peripheral nervous system. In mice, it was shown that the relative positioning of follicular dendritic cells (FDC) and sympathetic nervous

Altered insulin receptor processing and function in scrapie-infected neuroblastoma cell lines.

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The underlying neurochemical changes contributing to prion-induced neurodegeneration remain largely unknown. This study shows that scrapie infection induced a 2-fold increase of insulin receptor (IR) protein and aberrantly processed IR beta-chain in scrapie-infected N2a neuroblastoma cells (ScN2a)

Up-regulation of functionally impaired insulin-like growth factor-1 receptor in scrapie-infected neuroblastoma cells.

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A growing body of evidence suggests that an altered level or function of the neurotrophic insulin-like growth factor-1 receptor (IGF-1R), which supports neuronal survival, may underlie neurodegeneration. This study has focused on the expression and function of the IGF-1R in scrapie-infected

The key-role of tyrosine 155 in the mechanism of prion transconformation as highlighted by a study of sheep mutant peptides.

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Prion protein is a strongly conserved and ubiquitous glycoprotein. The conformational conversion of the non-pathogenic cellular prion isoform (PrP(C)) into a pathogenic scrapie isoform (PrP(Sc)) is a fundamental event in the onset of transmissible spongiform encephalopathies (TSE). During this

Adenovirus early region 3 RIDα protein limits NFκB signaling through stress-activated EGF receptors.

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The host limits adenovirus infections by mobilizing immune systems directed against infected cells that also represent major barriers to clinical use of adenoviral vectors. Adenovirus early transcription units encode a number of products capable of thwarting antiviral immune responses by co-opting

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