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Prion

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https://www.readbyqxmd.com/read/27648755/on-the-evolutionary-trajectories-of-signal-transducing-amyloids-in-fungi-and-beyond
#1
Asen Daskalov
In the last decade, multiple reports have established that amyloids can bear important functional roles in a variety of biological processes and in distant taxonomic clades. In filamentous fungi, amyloids are involved in a signal transducing mechanism in which a group of NOD-like receptors (NLRs) controls downstream effector proteins to induce a programmed cell death reaction. A structurally characterized example of fungal signal-transducing amyloid is the prion-forming domain (PFD) of the HET-S toxin from Podospora anserina...
September 20, 2016: Prion
https://www.readbyqxmd.com/read/27929804/familial-creutzfeldt-jakob-disease-case-report-and-role-of-genetic-counseling-in-post-mortem-testing
#2
Kristin Clift, Kimberly Guthrie, Eric W Klee, Nicole Boczek, Margot Cousin, Patrick Blackburn, Paldeep Atwal
Here we present a case of an asymptomatic 53-year-old woman who sought genetic testing for Familial Creutzfeldt-Jakob Disease (fCJD) after learning that her mother had fCJD. The patient's mother had a sudden onset of memory problems and rapidly deteriorating mental faculties in her late 70s, which led to difficulties ambulating, progressive non-fluent aphasia, dysphagia and death within ∼1 y of symptom onset. The cause of death was reported as "rapid onset dementia." The patient's family, unhappy with the vague diagnosis, researched prion disorders online and aggressively pursued causation and submitted frozen brain tissue from the mother to the National Prion Disease Surveillance Center, where testing revealed a previously described 5-octapeptide repeat insertion (5-OPRI) in the prion protein gene (PRNP) that is known to cause fCJD...
November 2016: Prion
https://www.readbyqxmd.com/read/27929803/an-autopsy-verified-case-of-ftld-tdp-type-a-with-upper-motor-neuron-predominant-motor-neuron-disease-mimicking-mm2-thalamic-type-sporadic-creutzfeldt-jakob-disease
#3
Yuichi Hayashi, Yasushi Iwasaki, Akira Takekoshi, Nobuaki Yoshikura, Takahiko Asano, Maya Mimuro, Akio Kimura, Katsuya Satoh, Tetsuyuki Kitamoto, Mari Yoshida, Takashi Inuzuka
Here we report an autopsy-verified case of frontotemporal lobar degeneration (FTLD)-transactivation responsive region (TAR) DNA binding protein (TDP) type A with upper motor neuron-predominant motor neuron disease mimicking MM2-thalamic-type sporadic Creutzfeldt-Jakob disease (sCJD). A 69-year-old woman presented with an 11-month history of progressive dementia, irritability, insomnia, and gait disturbance without a family history of dementia or prion disease. Neurological examination revealed severe dementia, frontal signs, and exaggerated bilateral tendon reflexes...
November 2016: Prion
https://www.readbyqxmd.com/read/27906600/role-of-polysaccharide-and-lipid-in-lipopolysaccharide-induced-prion-protein-conversion
#4
Carol L Ladner-Keay, Marcia LeVatte, David S Wishart
Conversion of native cellular prion protein (PrP(c)) from an α-helical structure to a toxic and infectious β-sheet structure (PrP(Sc)) is a critical step in the development of prion disease. There are some indications that the formation of PrP(Sc) is preceded by a β-sheet rich PrP (PrP(β)) form which is non-infectious, but is an intermediate in the formation of infectious PrP(Sc). Furthermore the presence of lipid cofactors is thought to be critical in the formation of both intermediate-PrP(β) and lethal, infectious PrP(Sc)...
November 2016: Prion
https://www.readbyqxmd.com/read/27892798/transmissibility-of-gerstmann-str%C3%A3-ussler-scheinker-syndrome-in-rodent-models-new-insights-into-the-molecular-underpinnings-of-prion-infectivity
#5
Romolo Nonno, Michele Angelo Di Bari, Umberto Agrimi, Laura Pirisinu
Prion diseases, or transmissible spongiform encephalopathies, have revealed the bewildering phenomenon of transmissibility in neurodegenerative diseases. Hence, the experimental transmissibility of prion-like neurodegenerative diseases via template directed misfolding has become the focus of intense research. Gerstmann-Sträussler-Scheinker disease (GSS) is an inherited prion disease associated with mutations in the prion protein gene. However, with the exception of a few GSS cases with P102L mutation characterized by co-accumulation of protease-resistant PrP core (PrP(res)) of ∼21 kDa, attempts to transmit to rodents GSS associated to atypical misfolded prion protein with ∼8 kDa PrP(res) have been unsuccessful...
November 2016: Prion
https://www.readbyqxmd.com/read/27870599/misfolding-leads-the-way-to-unraveling-signaling-pathways-in-the-pathophysiology-of-prion-diseases
#6
Berta Puig, Hermann C Altmeppen, Markus Glatzel
A misfolded version of the prion protein represents an essential component in the pathophysiology of fatal neurodegenerative prion diseases, which affect humans and animals alike. They may be of sporadic origin, acquired through exogenous introduction of infectious misfolded prion protein, or caused by genetic alterations in the prion protein coding gene. We have recently described a novel pathway linking retention of mutant prion protein in the early secretory pathway to activation p38-MAPK and a neurodegenerative phenotype in transgenic mice...
November 2016: Prion
https://www.readbyqxmd.com/read/27690738/the-small-heat-shock-protein-hsp31-cooperates-with-hsp104-to-modulate-sup35-prion-aggregation
#7
Kiran Aslam, Chai-Jui Tsai, Tony R Hazbun
The yeast homolog of DJ-1, Hsp31, is a multifunctional protein that is involved in several cellular pathways including detoxification of the toxic metabolite methylglyoxal and as a protein deglycase. Prior studies ascribed Hsp31 as a molecular chaperone that can inhibit α-Syn aggregation in vitro and alleviate its toxicity in vivo. It was also shown that Hsp31 inhibits Sup35 aggregate formation in yeast, however, it is unknown if Hsp31 can modulate [PSI(+)] phenotype and Sup35 prionogenesis. Other small heat shock proteins, Hsp26 and Hsp42 are known to be a part of a synergistic proteostasis network that inhibits Sup35 prion formation and promotes its disaggregation...
November 2016: Prion
https://www.readbyqxmd.com/read/27690734/quality-evaluation-for-the-surveillance-system-of-human-prion-diseases-in-china-based-on-the-data-from-2010-to-2016
#8
Qi Shi, Wei Zhou, Cao Chen, Chen Gao, Kang Xiao, Jing Wang, Bao-Yun Zhang, Yuan Wang, Feng Zhang, Xiao-Ping Dong
The surveillance of CJD or human prion diseases (PrDs) has been conducted for 10 y in China. To evaluate the quality of China CJD surveillance system, the collections of the clinical and epidemiological information, the sampling, the clinical examinations and laboratory tests and follow-up survey were separately analyzed based on the data from 2010 to 2015. The obtaining rates of clinical-information table, epidemiological-information table, sample inspection sheet and medical record of the referring patients from reporting units to the center of CJD surveillance maintained or reached at very high levels, being close to 100% in the past 3 y...
November 2016: Prion
https://www.readbyqxmd.com/read/27802081/response-to-commentary-on-identification-of-h-type-bse-in-portugal
#9
Leonor Orge, J Pedro Simas
No abstract text is available yet for this article.
September 2, 2016: Prion
https://www.readbyqxmd.com/read/27715442/tunneling-nanotubes-a-possible-highway-in-the-spreading-of-tau-and-other-prion-like-proteins-in-neurodegenerative-diseases
#10
Saida Abounit, Jessica W Wu, Karen Duff, Guiliana Soraya Victoria, Chiara Zurzolo
The mechanisms of intercellular spreading of amyloidogenic proteins involved in neurodegenerative diseases have yet to be fully elucidated. While secretion has been implicated in the transfer of many proteins, including prions and α-synuclein, tunneling nanotubes (TNTs) have also been demonstrated for prions and mutant Huntingtin. Here, we provide further evidence that Tau aggregates, which have been demonstrated to predominantly be transferred via secretion, can also be found in TNTs. Additionally, cells that have taken up Tau have increased TNT formation...
September 2, 2016: Prion
https://www.readbyqxmd.com/read/27649940/can-creutzfeldt-jakob-disease-unravel-the-mysteries-of-alzheimer
#11
Gabor G Kovacs
Recent studies on iatrogenic Creutzfeldt-Jakob disease (CJD) raised concerns that one of the hallmark lesions of Alzheimer disease (AD), amyloid-β (Aβ), may be transmitted from human-to-human. The neuropathology of AD-related lesions is complex. Therefore, many aspects need to be considered in deciding on this issue. Observations of recent studies can be summarized as follows: 1) The frequency of iatrogenic CJD cases with parencyhmal and vascular Aβ deposits is statistically higher than expected; 2) The morphology and distribution of Aβ deposition may show distinct features; 3) The pituitary and the dura mater themselves may serve as potential sources of Aβ seeds; 4) Cadaveric dura mater from 2 examined cases shows Aβ deposition; and 5) There is a lack of evidence that the clinical phenotype of AD appears following the application of cadaveric pituitary hormone or dura mater transplantation...
September 2, 2016: Prion
https://www.readbyqxmd.com/read/27649856/uncontrolled-sfk-mediated-protein-trafficking-in-prion-and-alzheimer-s-disease
#12
Edward Málaga-Trillo, Katharina Ochs
Prions and Amyloid beta (Aβ) peptides induce synaptic damage via complex mechanisms that include the pathological alteration of intracellular signaling cascades. The host-encoded cellular prion protein (PrP(C)) acts as a high-affinity cell surface receptor for both toxic species and it can modulate the endocytic trafficking of the N-methyl D-aspartate (NMDA) receptor and E-cadherin adhesive complexes via Src family kinases (SFKs). Interestingly, SFK-mediated control of endocytosis is a widespread mechanism used to regulate the activity of important transmembrane proteins, including neuroreceptors for major excitatory and inhibitory neurotransmitters...
September 2, 2016: Prion
https://www.readbyqxmd.com/read/27537339/caprine-prp-variants-harboring-asp-146-his-154-and-gln-211-alleles-display-reduced-convertibility-upon-interaction-with-pathogenic-murine-prion-protein-in-scrapie-infected-cells
#13
Eirini Kanata, Minas Arsenakis, Theodoros Sklaviadis
Scrapie, the prion disease of sheep and goats, is a devastating malady of small ruminants. Due to its infectious nature, epidemic outbreaks may occur in flocks/herds consisting of highly susceptible animals. Field studies identified scrapie-protective caprine PrP variants, harboring specific single amino acid changes (Met-142, Arg-143, Asp-146, Ser-146, His-154, Gln-211 and Lys-222). Their effects are under further evaluation, and aim to determine the most protective allele. We assessed some of these variants (Asp-146, His-154, Gln-211 and Lys-222), after their exogenous expression as murine-caprine chimeras in a scrapie- infected murine cell line...
September 2, 2016: Prion
https://www.readbyqxmd.com/read/27580010/application-of-mathematical-expectation-me-strategy-for-detecting-low-frequency-mutations-an-example-for-evaluating-14-bp-insertion-deletion-indel-within-the-bovine-prnp-gene
#14
Qing Yang, Sihuan Zhang, Liangliang Liu, Xiukai Cao, Chuzhao Lei, Xinglei Qi, Fengpeng Lin, Weidong Qu, Xingshan Qi, Jiming Liu, Rongmin Wang, Hong Chen, Xianyong Lan
The detection method based on the mathematical expectation (ME) strategy is fast and accuracy for low frequency mutation screening in large samples. Previous studies have found that the 14-bp insertion/deletion (indel) variants of the 3' untranslated region (3' UTR) within bovine PRNP gene have been characterized with low frequency (≤ 5%) in global breeds outside China, which has not been determined in Chinese cattle breeds yet. Therefore, this study aimed to identify the 14-bp indel within PRNP gene in five major Chinese indigenous cattle breeds and to evaluate its associations with phenotypic traits...
August 31, 2016: Prion
https://www.readbyqxmd.com/read/27537196/intra-host-mathematical-model-of-chronic-wasting-disease-dynamics-in-deer-odocoileus
#15
Karen M Holcomb, Nathan L Galloway, Candace K Mathiason, Michael F Antolin
Bioassays of native cervid hosts have established the presence of infectious chronic wasting disease (CWD) prions in saliva, blood, urine, and feces of clinically diseased and pre-clinical infected deer. The intra-host trafficking of prions from the time of initial infection to shedding has been less well defined. We created a discrete-time compartmentalized model to simulate the misfolding catalysis, trafficking, and shedding of infectious prions throughout the organ systems of CWD-infected cervids. Using parameter values derived from experimental infections of North American deer (Odocoileus spp...
August 18, 2016: Prion
https://www.readbyqxmd.com/read/27435663/commentary-on-identificaton-of-h-type-bse-in-portugal
#16
Fabienne Serra, Torsten Seuberlich
No abstract text is available yet for this article.
July 19, 2016: Prion
https://www.readbyqxmd.com/read/27565566/corrigendum
#17
(no author information available yet)
No abstract text is available yet for this article.
July 3, 2016: Prion
https://www.readbyqxmd.com/read/27565565/corrigendum
#18
(no author information available yet)
No abstract text is available yet for this article.
July 3, 2016: Prion
https://www.readbyqxmd.com/read/27565564/establishment-of-a-simple-cell-based-elisa-for-the-direct-detection-of-abnormal-isoform-of-prion-protein-from-prion-infected-cells-without-cell-lysis-and-proteinase-k-treatment
#19
Zhifu Shan, Takeshi Yamasaki, Akio Suzuki, Rie Hasebe, Motohiro Horiuchi
Prion-infected cells have been used for analyzing the effect of compounds on the formation of abnormal isoform of prion protein (PrP(Sc)). PrP(Sc) is usually detected using anti-prion protein (PrP) antibodies after the removal of the cellular isoform of prion protein (PrP(C)) by proteinase K (PK) treatment. However, it is expected that the PK-sensitive PrP(Sc) (PrP(Sc)-sen), which possesses higher infectivity and conversion activity than the PK-resistant PrP(Sc) (PrP(Sc)-res), is also digested through PK treatment...
July 3, 2016: Prion
https://www.readbyqxmd.com/read/27565563/strain-conformation-controls-the-specificity-of-cross-species-prion-transmission-in-the-yeast-model
#20
Anastasia V Grizel, Aleksandr A Rubel, Yury O Chernoff
Transmissible self-assembled fibrous cross-β polymer infectious proteins (prions) cause neurodegenerative diseases in mammals and control non-Mendelian heritable traits in yeast. Cross-species prion transmission is frequently impaired, due to sequence differences in prion-forming proteins. Recent studies of prion species barrier on the model of closely related yeast species show that colocalization of divergent proteins is not sufficient for the cross-species prion transmission, and that an identity of specific amino acid sequences and a type of prion conformational variant (strain) play a major role in the control of transmission specificity...
July 3, 2016: Prion
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