Zafar, Saima

[["dc.bibliographiccitation.firstpage","265"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Journal of Alzheimer's Disease"],["dc.bibliographiccitation.lastpage","275"],["dc.bibliographiccitation.volume","59"],["dc.contributor.author","Zafar, Saima"],["dc.contributor.author","Shafiq, Mohsin"],["dc.contributor.author","Younas, Neelam"],["dc.contributor.author","Schmitz, Matthias"],["dc.contributor.author","Ferrer, Isidre"],["dc.contributor.author","Zerr, Inga"],["dc.date.accessioned","2020-12-10T18:44:11Z"],["dc.date.available","2020-12-10T18:44:11Z"],["dc.date.issued","2017"],["dc.identifier.doi","10.3233/JAD-170237"],["dc.identifier.eissn","1875-8908"],["dc.identifier.issn","1387-2877"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/78355"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Prion Protein Interactome: Identifying Novel Targets in Slowly and Rapidly Progressive Forms of Alzheimer’s Disease"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.journal","Molecular Neurobiology"],["dc.contributor.author","Zafar, Saima"],["dc.contributor.author","Younas, Neelam"],["dc.contributor.author","Sheikh, Nadeem"],["dc.contributor.author","Tahir, Waqas"],["dc.contributor.author","Shafiq, Mohsin"],["dc.contributor.author","Schmitz, Matthias"],["dc.contributor.author","Ferrer, Isidre"],["dc.contributor.author","Andréoletti, Olivier"],["dc.contributor.author","Zerr, Inga"],["dc.date.accessioned","2020-12-10T14:14:25Z"],["dc.date.available","2020-12-10T14:14:25Z"],["dc.date.issued","2017"],["dc.identifier.doi","10.1007/s12035-017-0589-0"],["dc.identifier.eissn","1559-1182"],["dc.identifier.issn","0893-7648"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/71344"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Cytoskeleton-Associated Risk Modifiers Involved in Early and Rapid Progression of Sporadic Creutzfeldt-Jakob Disease"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.journal","Molecular Neurobiology"],["dc.contributor.author","Noor, Aneeqa"],["dc.contributor.author","Zafar, Saima"],["dc.contributor.author","Shafiq, Mohsin"],["dc.contributor.author","Younas, Neelam"],["dc.contributor.author","Siegert, Anna"],["dc.contributor.author","Mann, Florian A."],["dc.contributor.author","Kruss, Sebastian"],["dc.contributor.author","Schmitz, Matthias"],["dc.contributor.author","Dihazi, Hassan"],["dc.contributor.author","Ferrer, Isidre"],["dc.contributor.author","Zerr, Inga"],["dc.date.accessioned","2021-12-01T09:23:29Z"],["dc.date.available","2021-12-01T09:23:29Z"],["dc.date.issued","2021"],["dc.description.abstract","Abstract The molecular determinants of atypical clinical variants of Alzheimer’s disease, including the recently discovered rapidly progressive Alzheimer’s disease (rpAD), are unknown to date. Fibrilization of the amyloid-β (Aβ) peptide is the most frequently studied candidate in this context. The Aβ peptide can exist as multiple proteoforms that vary in their post-translational processing, amyloidogenesis, and toxicity. The current study was designed to identify these variations in Alzheimer’s disease patients exhibiting classical (sAD) and rapid progression, with the primary aim of establishing if these variants may constitute strains that underlie the phenotypic variability of Alzheimer’s disease. We employed two-dimensional polyacrylamide gel electrophoresis and MALDI-ToF mass spectrometry to validate and identify the Aβ proteoforms extracted from targeted brain tissues. The biophysical analysis was conducted using RT-QuIC assay, confocal microscopy, and atomic force microscopy. Interactome analysis was performed by co-immunoprecipitation. We present a signature of 33 distinct pathophysiological proteoforms, including the commonly targeted Aβ 40 , Aβ 42 , Aβ 4-42 , Aβ 11-42 , and provide insight into their synthesis and quantities. Furthermore, we have validated the presence of highly hydrophobic Aβ seeds in rpAD brains that seeded reactions at a slower pace in comparison to typical Alzheimer’s disease. In vitro and in vivo analyses also verified variations in the molecular pathways modulated by brain-derived Aβ. These variations in the presence, synthesis, folding, and interactions of Aβ among sAD and rpAD brains constitute important points of intervention. Further validation of reported targets and mechanisms will aid in the diagnosis of and therapy for Alzheimer’s disease."],["dc.description.abstract","Abstract The molecular determinants of atypical clinical variants of Alzheimer’s disease, including the recently discovered rapidly progressive Alzheimer’s disease (rpAD), are unknown to date. Fibrilization of the amyloid-β (Aβ) peptide is the most frequently studied candidate in this context. The Aβ peptide can exist as multiple proteoforms that vary in their post-translational processing, amyloidogenesis, and toxicity. The current study was designed to identify these variations in Alzheimer’s disease patients exhibiting classical (sAD) and rapid progression, with the primary aim of establishing if these variants may constitute strains that underlie the phenotypic variability of Alzheimer’s disease. We employed two-dimensional polyacrylamide gel electrophoresis and MALDI-ToF mass spectrometry to validate and identify the Aβ proteoforms extracted from targeted brain tissues. The biophysical analysis was conducted using RT-QuIC assay, confocal microscopy, and atomic force microscopy. Interactome analysis was performed by co-immunoprecipitation. We present a signature of 33 distinct pathophysiological proteoforms, including the commonly targeted Aβ 40 , Aβ 42 , Aβ 4-42 , Aβ 11-42 , and provide insight into their synthesis and quantities. Furthermore, we have validated the presence of highly hydrophobic Aβ seeds in rpAD brains that seeded reactions at a slower pace in comparison to typical Alzheimer’s disease. In vitro and in vivo analyses also verified variations in the molecular pathways modulated by brain-derived Aβ. These variations in the presence, synthesis, folding, and interactions of Aβ among sAD and rpAD brains constitute important points of intervention. Further validation of reported targets and mechanisms will aid in the diagnosis of and therapy for Alzheimer’s disease."],["dc.identifier.doi","10.1007/s12035-021-02566-9"],["dc.identifier.pii","2566"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/94665"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-478"],["dc.relation.eissn","1559-1182"],["dc.relation.issn","0893-7648"],["dc.title","Molecular Profiles of Amyloid-β Proteoforms in Typical and Rapidly Progressive Alzheimer’s Disease"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","329"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Journal of Molecular Neuroscience"],["dc.bibliographiccitation.lastpage","348"],["dc.bibliographiccitation.volume","56"],["dc.contributor.author","Zafar, Saima"],["dc.contributor.author","Schmitz, Matthias"],["dc.contributor.author","Younus, Neelam"],["dc.contributor.author","Tahir, Waqas"],["dc.contributor.author","Shafiq, Mohsin"],["dc.contributor.author","Llorens, Franc"],["dc.contributor.author","Ferrer, Isidre"],["dc.contributor.author","Andeoletti, Olivier"],["dc.contributor.author","Zerr, Inga"],["dc.date.accessioned","2018-11-07T09:56:36Z"],["dc.date.available","2018-11-07T09:56:36Z"],["dc.date.issued","2015"],["dc.description.abstract","Small GTPases of the Arf family mainly activate the formation of coated carrier vesicles. We showed that classI Arf1 interacts specifically with full length GPI-anchored cellular prion protein (PrPC). Several recent reports have also demonstrated a missing link between the endoplasmic reticulum and the Golgi-complex role for proper folding, but the exact molecular mechanism is not yet fully understood. In the present study, we identified and characterized the interactive role of Arf1 during PrPC intracellular distribution under pathophysiological conditions. PrPC interaction with Arf1 was investigated in cortical primary neuronal cultures of PrPC wild type and knockout mice (PrP-/-). Arf1 and PrPC co-binding affinity was confirmed using reverse co-immunoprecipitation, co-localization affinity using confocal laser-scanning microscopy. Treatment with brefeldin-A modulated Arf1 expression and resulted in down-regulation and redistribution of PrPC into cytosolic region. In the pre-symptomatic stage of the disease, Arf1 expression was significantly downregulated in the frontal cortex in tg340 mice expressing about fourfold of human PrP-M129 with PrP null background that had been inoculated with human sCJD MM1 brain tissue homogenates (sCJD MM1 mice). In addition, the frontal cortex of CJD human brain demonstrated significant binding capacity of Arf1 protein using co-immunoprecipitation analysis. We also examined Arf1 expression in the brain of CJD patients with the subtypesMM1 and VV2 and found that it was regulated in a region-specific manner. In the frontal cortex, Arf1 expression was not significantly changed in either MM1 or VV2 subtype. Interestingly, Arf1 expression was significantly reduced in the cerebellum in both subtypes as compared to controls. Furthermore, we observed altered RhoA activity, which in turn affects myosin light-chain (MLC) phosphorylation and Arf1-dependent PI3K pathway. Together, our findings underscore a key early symptomatic role of Arf1 in neurodegeneration. Targeting the Arf/Rho/MLC signaling axis might be a promising strategy to uncover the missing link which probably influences disease progression and internal homeostasis of misfolded proteins."],["dc.identifier.doi","10.1007/s12031-015-0544-3"],["dc.identifier.isi","000355753800010"],["dc.identifier.pmid","25896910"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/36992"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Humana Press Inc"],["dc.relation.issn","1559-1166"],["dc.relation.issn","0895-8696"],["dc.title","Creutzfeldt-Jakob Disease Subtype-Specific Regional and Temporal Regulation of ADP Ribosylation Factor-1-Dependent Rho/MLC Pathway at Pre-Clinical Stage"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","11"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Molecular Neurodegeneration"],["dc.bibliographiccitation.volume","16"],["dc.contributor.author","Shafiq, Mohsin"],["dc.contributor.author","Zafar, Saima"],["dc.contributor.author","Younas, Neelam"],["dc.contributor.author","Noor, Aneeqa"],["dc.contributor.author","Puig, Berta"],["dc.contributor.author","Altmeppen, Hermann C."],["dc.contributor.author","Schmitz, Matthias"],["dc.contributor.author","Matschke, Jakob"],["dc.contributor.author","Ferrer, Isidre"],["dc.contributor.author","Glatzel, Markus"],["dc.contributor.author","Zerr, Inga"],["dc.date.accessioned","2021-06-01T10:48:05Z"],["dc.date.accessioned","2022-08-16T12:59:31Z"],["dc.date.available","2021-06-01T10:48:05Z"],["dc.date.available","2022-08-16T12:59:31Z"],["dc.date.issued","2021-02-22"],["dc.date.updated","2022-07-29T12:17:40Z"],["dc.description.abstract","Abstract\r\n \r\n Background\r\n High-density oligomers of the prion protein (HDPs) have previously been identified in brain tissues of patients with rapidly progressive Alzheimer’s disease (rpAD). The current investigation aims at identifying interacting partners of HDPs in the rpAD brains to unravel the pathological involvement of HDPs in the rapid progression.\r\n \r\n \r\n Methods\r\n HDPs from the frontal cortex tissues of rpAD brains were isolated using sucrose density gradient centrifugation. Proteins interacting with HDPs were identified by co-immunoprecipitation coupled with mass spectrometry. Further verifications were carried out using proteomic tools, immunoblotting, and confocal laser scanning microscopy.\r\n \r\n \r\n Results\r\n We identified rpAD-specific HDP-interactors, including the growth arrest specific 2-like 2 protein (G2L2). Intriguingly, rpAD-specific disturbances were found in the localization of G2L2 and its associated proteins i.e., the end binding protein 1, α-tubulin, and β-actin.\r\n \r\n \r\n Discussion\r\n The results show the involvement of HDPs in the destabilization of the neuronal actin/tubulin infrastructure. We consider this disturbance to be a contributing factor for the rapid progression in rpAD."],["dc.description.sponsorship","Open-Access-Finanzierung durch die Universitätsmedizin Göttingen 2021"],["dc.identifier.citation","Molecular Neurodegeneration. 2021 Feb 22;16(1):11"],["dc.identifier.doi","10.1186/s13024-021-00422-x"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/17736"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/85822"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/112753"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-425"],["dc.notes.intern","Merged from goescholar"],["dc.relation.eissn","1750-1326"],["dc.relation.orgunit","Klinik für Neurologie"],["dc.rights","CC BY 4.0"],["dc.rights.holder","The Author(s)"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0"],["dc.subject","Rapidly progressive Alzheimer’s disease"],["dc.subject","rpAD"],["dc.subject","Growth arrest specific proteins"],["dc.subject","GAS"],["dc.subject","Growth arrest specific 2 like 2"],["dc.subject","G2L2"],["dc.subject","Prion protein oligomers"],["dc.subject","PrPC"],["dc.subject","Co-immunoprecipitation"],["dc.subject","Cytoskeleton"],["dc.subject","Actin"],["dc.subject","Tubulin"],["dc.title","Prion protein oligomers cause neuronal cytoskeletal damage in rapidly progressive Alzheimer’s disease"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Molecular Neurodegeneration"],["dc.bibliographiccitation.volume","16"],["dc.contributor.author","Shafiq, Mohsin"],["dc.contributor.author","Zafar, Saima"],["dc.contributor.author","Younas, Neelam"],["dc.contributor.author","Noor, Aneeqa"],["dc.contributor.author","Puig, Berta"],["dc.contributor.author","Altmeppen, Hermann Clemens"],["dc.contributor.author","Schmitz, Matthias"],["dc.contributor.author","Matschke, Jakob"],["dc.contributor.author","Ferrer, Isidre"],["dc.contributor.author","Zerr, Inga"],["dc.date.accessioned","2021-06-01T10:48:05Z"],["dc.date.available","2021-06-01T10:48:05Z"],["dc.date.issued","2021"],["dc.description.abstract","Abstract Background High-density oligomers of the prion protein (HDPs) have previously been identified in brain tissues of patients with rapidly progressive Alzheimer’s disease (rpAD). The current investigation aims at identifying interacting partners of HDPs in the rpAD brains to unravel the pathological involvement of HDPs in the rapid progression. Methods HDPs from the frontal cortex tissues of rpAD brains were isolated using sucrose density gradient centrifugation. Proteins interacting with HDPs were identified by co-immunoprecipitation coupled with mass spectrometry. Further verifications were carried out using proteomic tools, immunoblotting, and confocal laser scanning microscopy. Results We identified rpAD-specific HDP-interactors, including the growth arrest specific 2-like 2 protein (G2L2). Intriguingly, rpAD-specific disturbances were found in the localization of G2L2 and its associated proteins i.e., the end binding protein 1, α-tubulin, and β-actin. Discussion The results show the involvement of HDPs in the destabilization of the neuronal actin/tubulin infrastructure. We consider this disturbance to be a contributing factor for the rapid progression in rpAD."],["dc.description.sponsorship","Open-Access-Finanzierung durch die Universitätsmedizin Göttingen 2021"],["dc.identifier.doi","10.1186/s13024-021-00422-x"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/17736"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/85822"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-425"],["dc.notes.intern","Merged from goescholar"],["dc.relation.eissn","1750-1326"],["dc.relation.isreplacedby","hdl:null"],["dc.relation.orgunit","Klinik für Neurologie"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0"],["dc.title","Prion protein oligomers cause neuronal cytoskeletal damage in rapidly progressive Alzheimer’s disease"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","697"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Molecular Neurobiology"],["dc.bibliographiccitation.lastpage","709"],["dc.bibliographiccitation.volume","54"],["dc.contributor.author","Zafar, Saima"],["dc.contributor.author","Younas, Neelam"],["dc.contributor.author","Correia, Susana"],["dc.contributor.author","Shafiq, Mohsin"],["dc.contributor.author","Tahir, Waqas"],["dc.contributor.author","Schmitz, Matthias"],["dc.contributor.author","Ferrer, Isidre"],["dc.contributor.author","Andreoletti, Olivier"],["dc.contributor.author","Zerr, Inga"],["dc.date.accessioned","2018-11-07T10:29:22Z"],["dc.date.available","2018-11-07T10:29:22Z"],["dc.date.issued","2017"],["dc.description.abstract","There is an increasing demand for the understanding of pathophysiology on neurodegeneration diseases at early stages. Changes in endocytic machinery and the cytoskeleton-associated response are the first alterations observed in Creutzfeldt-Jakob disease (CJD) and Alzheimer's disease AD brain. In this study, we performed a targeted search for endocytic pathway proteins in the different regions of the brain. We found late endosome marker Rab7a which was significantly upregulated in the frontal cortex region in the rapid progressive CJD form (MM1) and rapid progressive AD (rpAD) forms. However, Rab9 expression was significantly downregulated only in CJD-MM1 brain frontal cortex region. In the cerebellum, Rab7a expression showed significant upregulation in both subtype MM1 and VV2 CJD forms, in contrast to Rab9 which showed significant downregulation in both subtype MM1 and VV2 CJD forms at terminal stage of the disease. To check regulatory response at pre-symptomatic stage of the disease, we checked the regulatory interactive response of Rab7a, Rab9, and known biomarkers PrPC and tau forms in frontal cortex at pre-symptomatic stage of the disease in tg340 mice expressing about fourfold of human PrP-M129 with PrP-null background that had been inoculated with human sCJD MM1 brain tissue homogenates (sCJD MM1 mice). In addition, we analyzed 5XFAD mice, exhibiting five mutations in the APP and presenilin genes related to familial Alzheimer's disease (FAD), to validate specific regulatory response of Rab7a, Rab9, tau, and phosphorylated form of tau by immunostaining 5XFAD mice in comparison with the wild-type age-matched mice brain. The cortical region of 5XFAD mice brain showed accumulated form of Rab7a in puncta that co-label for p-Tau, indicating colocalization by using confocal laser-scanning microscopy and was confirmed by using reverse co-immunoprecipitation. Furthermore, synthetic RNA (siRNA) against the Rab7a gene decreased expression of Rab7a protein, in cortical primary neuronal cultures of PrPC wild type. This depleted expression of Rab7a led to the increased accumulation of PrPC in Rab9-positive endosomal compartments and consequently an increased co-localization between PrPC/Rab9; however, total tau level decreased. Interestingly, siRNA against tau gene in cortical primary neuronal cultures of PrPC wild-type mice showed enhanced Rab7a and Rab9 expression and increase formation of dendritic spines. The work described highlighted the selective involvement of late endosomal compartment marker Rab7a in CJD, slow and rapid progressive forms of AD pathogenesis."],["dc.identifier.doi","10.1007/s12035-016-9694-8"],["dc.identifier.isi","000392133900058"],["dc.identifier.pmid","26768426"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/43631"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","PUB_WoS_Import"],["dc.publisher","Humana Press Inc"],["dc.relation.issn","1559-1182"],["dc.relation.issn","0893-7648"],["dc.title","Strain-Specific Altered Regulatory Response of Rab7a and Tau in Creutzfeldt-Jakob Disease and Alzheimer's Disease"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.journal","Prion"],["dc.bibliographiccitation.volume","10"],["dc.contributor.author","Shafiq, Mohsin"],["dc.contributor.author","Zafar, Saima"],["dc.contributor.author","Younas, Neelam"],["dc.contributor.author","Schmitz, Matthias"],["dc.contributor.author","Ferrer, Isidre"],["dc.contributor.author","Zerr, Inga"],["dc.date.accessioned","2018-11-07T10:20:26Z"],["dc.date.available","2018-11-07T10:20:26Z"],["dc.date.issued","2016"],["dc.format.extent","S97"],["dc.identifier.isi","000374656300138"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/41892"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Taylor & Francis Inc"],["dc.publisher.place","Philadelphia"],["dc.relation.issn","1933-690X"],["dc.relation.issn","1933-6896"],["dc.title","Prion protein interactome: Identifying novel targets in rapidly progressive Alzheimer's disease"],["dc.type","conference_abstract"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1"],["dc.bibliographiccitation.issue","35"],["dc.bibliographiccitation.journal","Acta Neuropathologica Communication"],["dc.bibliographiccitation.lastpage","20"],["dc.bibliographiccitation.volume","5"],["dc.contributor.author","Llorens, Franc"],["dc.contributor.author","Fischer, Andre"],["dc.contributor.author","Thüne, Katrin"],["dc.contributor.author","Sikorska, Beata"],["dc.contributor.author","Schmitz, Matthias"],["dc.contributor.author","Tahir, Waqas"],["dc.contributor.author","Fernández-Borges, Natalia"],["dc.contributor.author","Cramm, Maria"],["dc.contributor.author","Gotzmann, Nadine"],["dc.contributor.author","Carmona, Margarita"],["dc.contributor.author","Streichenberger, Nathalie"],["dc.contributor.author","Michel, Uwe"],["dc.contributor.author","Zafar, Saima"],["dc.contributor.author","Schuetz, Anna-Lena"],["dc.contributor.author","Rajput, Ashish"],["dc.contributor.author","Andréoletti, Olivier"],["dc.contributor.author","Bonn, Stefan"],["dc.contributor.author","Liberski, Pawel P."],["dc.contributor.author","Torres, Juan Maria"],["dc.contributor.author","Ferrer, Isidre"],["dc.contributor.author","Zerr, Inga"],["dc.date.accessioned","2018-01-09T14:57:08Z"],["dc.date.available","2018-01-09T14:57:08Z"],["dc.date.issued","2017-04-27"],["dc.description.abstract","Sporadic Creutzfeldt-Jakob disease (sCJD) is the most prevalent form of human prion disease and it is characterized by the presence of neuronal loss, spongiform degeneration, chronic inflammation and the accumulation of misfolded and pathogenic prion protein (PrPSc). The molecular mechanisms underlying these alterations are largely unknown, but the presence of intracellular neuronal calcium (Ca2+) overload, a general feature in models of prion diseases, is suggested to play a key role in prion pathogenesis.Here we describe the presence of massive regulation of Ca2+ responsive genes in sCJD brain tissue, accompanied by two Ca2+-dependent processes: endoplasmic reticulum stress and the activation of the cysteine proteases Calpains 1/2. Pathogenic Calpain proteins activation in sCJD is linked to the cleavage of their cellular substrates, impaired autophagy and lysosomal damage, which is partially reversed by Calpain inhibition in a cellular prion model. Additionally, Calpain 1 treatment enhances seeding activity of PrPSc in a prion conversion assay. Neuronal lysosomal impairment caused by Calpain over activation leads to the release of the lysosomal protease Cathepsin S that in sCJD mainly localises in axons, although massive Cathepsin S overexpression is detected in microglial cells. Alterations in Ca2+ homeostasis and activation of Calpain-Cathepsin axis already occur at pre-clinical stages of the disease as detected in a humanized sCJD mouse model.Altogether our work indicates that unbalanced Calpain-Cathepsin activation is a relevant contributor to the pathogenesis of sCJD at multiple molecular levels and a potential target for therapeutic intervention."],["dc.description.sponsorship","Open-Access-Publikationsfonds 2017"],["dc.identifier.doi","10.1186/s40478-017-0431-y"],["dc.identifier.pmid","28449707"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/14726"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/11612"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","final"],["dc.relation.eissn","2051-5960"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0"],["dc.title","Altered Ca2+ homeostasis induces Calpain-Cathepsin axis activation in sporadic Creutzfeldt-Jakob disease"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","S102"],["dc.bibliographiccitation.journal","Prion"],["dc.bibliographiccitation.lastpage","S103"],["dc.bibliographiccitation.volume","10"],["dc.contributor.author","Younas, Neelam"],["dc.contributor.author","Zafar, Saima"],["dc.contributor.author","Shafiq, Mohsin"],["dc.contributor.author","Tahir, Waqas"],["dc.contributor.author","Schmitz, Mathias"],["dc.contributor.author","Ferrer, Isidre"],["dc.contributor.author","Andreoletti, Olivier"],["dc.contributor.author","Zerr, Inga"],["dc.date.accessioned","2018-11-07T10:20:26Z"],["dc.date.available","2018-11-07T10:20:26Z"],["dc.date.issued","2016"],["dc.identifier.isi","000374656300145"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/41893"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Taylor & Francis Inc"],["dc.publisher.place","Philadelphia"],["dc.relation.issn","1933-690X"],["dc.relation.issn","1933-6896"],["dc.title","Early response of Cofilin1 pathway in Creutzfeldt Jakob disease"],["dc.type","conference_abstract"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]