A short purification process for quantitative isolation of PrP(Sc) from naturally occurring and experimental transmissible spongiform encephalopathies

BACKGROUND: Transmissible spongiform encephalopathies (TSEs) are neurodegenerative diseases affecting both humans and animals. They are associated with post-translational conversion of the normal cellular prion protein (PrP(C)) into a heat- and protease-resistant abnormal isoform (PrP(Sc)). Detection of PrP(Sc) in individuals is widely utilized for the diagnosis of prion diseases. METHODS: TSE brain tissue samples have been processed in order to quantitatively isolate PrP(Sc). The protocol includes an initial homogenization, digestion with proteinase K and salt precipitation. RESULTS: Here we show that over 97 percent of the PrP(Sc) present can be precipitated from infected brain material using this simple salting-out procedure for proteins. No chemically harsh conditions are used during the process in order to conserve the native quality of the isolated protein. CONCLUSION: The resulting PrP(Sc)-enriched preparation should provide a suitable substrate for analyzing the structure of the prion agent and for scavenging for other molecules with which it may associate. In comparison with most methods that exist today, the one described in this study is rapid, cost-effective and does not demand expensive laboratory equipment

Dengue-2 Structural Proteins Associate with Human Proteins to Produce a Coagulation and Innate Immune Response Biased Interactome

<p>Abstract</p> <p>Background</p> <p>Dengue virus infection is a public health threat to hundreds of millions of individuals in the tropical regions of the globe. Although Dengue infection usually manifests itself in its mildest, though often debilitating clinical form, dengue fever, life-threatening complications commonly arise in the form of hemorrhagic shock and encephalitis. The etiological basis for the virus-induced pathology in general, and the different clinical manifestations in particular, are not well understood. We reasoned that a detailed knowledge of the global biological processes affected by virus entry into a cell might help shed new light on this long-standing problem.</p> <p>Methods</p> <p>A bacterial two-hybrid screen using DENV2 structural proteins as bait was performed, and the results were used to feed a manually curated, global dengue-human protein interaction network. Gene ontology and pathway enrichment, along with network topology and microarray meta-analysis, were used to generate hypothesis regarding dengue disease biology.</p> <p>Results</p> <p>Combining bioinformatic tools with two-hybrid technology, we screened human cDNA libraries to catalogue proteins physically interacting with the DENV2 virus structural proteins, Env, cap and PrM. We identified 31 interacting human proteins representing distinct biological processes that are closely related to the major clinical diagnostic feature of dengue infection: haemostatic imbalance. In addition, we found dengue-binding human proteins involved with additional key aspects, previously described as fundamental for virus entry into cells and the innate immune response to infection. Construction of a DENV2-human global protein interaction network revealed interesting biological properties suggested by simple network topology analysis.</p> <p>Conclusions</p> <p>Our experimental strategy revealed that dengue structural proteins interact with human protein targets involved in the maintenance of blood coagulation and innate anti-viral response processes, and predicts that the interaction of dengue proteins with a proposed human protein interaction network produces a modified biological outcome that may be behind the hallmark pathologies of dengue infection.</p

Patient-provider concordance in the perception of illness and disease: a cross-sectional study among multimorbid patients and their general practitioners in Switzerland

Stefan Neuner-Jehle, Stefan Zechmann, Daniela Grundmann Maissen, Thomas Rosemann, Oliver Senn Institute of Primary Care, University of Zurich, Zurich, Switzerland Background: Multiple chronic health conditions are leading to multiple treatment procedures and polypharmacy. Prioritizing treatment according to patients&rsquo; needs and preferences may be helpful for deprescribing. Thus, for improving health care, it is crucial for general practitioners (GPs) to perceive the chief complaints (CCs) of patients. The primary aim of this study was to investigate the patient&ndash;provider concordance of CCs and the secondary aim was to investigate the concordance between CCs and diagnosis, in a sample of Swiss multimorbid patients. Materials and methods: A cross-sectional analysis based on a cluster randomized controlled trial (RCT) among 46 GPs, recruited between March 2015 to July 2016, and 334 multimorbid patients (&ge;60&nbsp;years taking &ge;5 drugs for at least 6&nbsp;months) in Northern Switzerland was performed. CCs listed by GPs and by patients (n=128) were classified according to the International Classification of Primary Care, version 2 (ICPC-2) coding system on chapter and component level and defined as concordant if ICPC-2 codes of patients and GPs were identical. Concordance was classified into full, moderate or low, depending on the ranking of patients&rsquo; CCs on GPs&rsquo; list. As secondary outcome, we compared patients&rsquo; CCs to GPs&rsquo; diagnosis. Statistics included descriptive measures and a multivariate regression analysis of factors that are modifying concordance. Results: The mean age of patients was 76.9 (SD 8.1) years, where 38% were male, taking 7.9 (SD 2.6) drugs on the long term. The most frequent complaint was pain. Concordance of the CC was given in 101/128 (78.9%) on the ICPC-2 chapter level, whereby 86/128 (67.2%) showed full, 8/128 (6.3%) moderate and 7/128 (5.5%) low concordance; 27/128 (21.1%) were discordant. Concordance between CCs and diagnosis was 53.6%. Concordance increased with the intensity of the CC rated by patients (OR 1.48, CI 1.13&ndash;1.94, P&lt;0.001). The younger age and higher intake of drugs were significantly associated with an increased concordance between CCs and diagnosis. Conclusion: A majority of GPs perceive the CCs of the multimorbid patients correctly, but there is room for improvement. Keywords: deprescribing, multimorbidity, patient&ndash;provider concordance, chief complain

Advancing the 3Rs: Innovation, implementation, ethics and society

This is the author accepted manuscript. The final version is available from Frontiers Media via the DOI in this record The 3Rs principle of replacing, reducing and refining the use of animals in science has been gaining widespread support in the international research community and appears in transnational legislation such as the European Directive 2010/63/EU, a number of national legislative frameworks, and other rules and guidance in place in countries around the world. At the same time, progress in technical and biomedical research, along with the changing status of animals in many societies, challenges the view of the 3Rs principle as a sufficient and effective approach to the moral challenges set by animal use in research. Given this growing awareness of our moral responsibilities to animals, the aim of this paper is to address the question: Can the 3Rs, as a policy instrument for science and research, still guide the morally acceptable use of animals for scientific purposes, and if so, how? The fact that the increased availability of alternatives to animal models has not correlated inversely with a decrease in the numbers of animals used in research has led to public and political calls for more radical action. However, a focus on the simple measure of total animal numbers distracts from the need for a more nuanced understanding of how the 3Rs principle can have genuine influence as a guiding instrument in research and testing. Hence, we focus on three core dimensions of the 3Rs in contemporary research: (1) What scientific innovations are needed to advance the goals of the 3Rs? (2) What can be done to facilitate the implementation of existing and new 3R methods? (3) Do the 3Rs still offer an adequate ethical framework given the increasing social awareness of animal needs and human moral responsibilities? By answering these questions, we will identify core perspectives in the debate over the advancement of the 3Rs.Wellcome TrustNRP 7