Tahir, Waqas

[["dc.bibliographiccitation.firstpage","95"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Prion"],["dc.bibliographiccitation.lastpage","108"],["dc.bibliographiccitation.volume","14"],["dc.contributor.author","Arora, Amandeep Singh"],["dc.contributor.author","Zafar, Saima"],["dc.contributor.author","Latif, Umair"],["dc.contributor.author","Llorens, Franc"],["dc.contributor.author","Mihm, Sabine"],["dc.contributor.author","Kumar, Prateek"],["dc.contributor.author","Tahir, Waqas"],["dc.contributor.author","Thüne, Katrin"],["dc.contributor.author","Shafiq, Mohsin"],["dc.contributor.author","Schmitz, Matthias"],["dc.contributor.author","Zerr, Inga"],["dc.date.accessioned","2020-12-10T18:15:28Z"],["dc.date.available","2020-12-10T18:15:28Z"],["dc.date.issued","2020"],["dc.identifier.doi","10.1080/19336896.2020.1729074"],["dc.identifier.eissn","1933-690X"],["dc.identifier.issn","1933-6896"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/17401"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/74854"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.notes.intern","Merged from goescholar"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","The role of cellular prion protein in lipid metabolism in the liver"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.version","published_version"],["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.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.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.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"]]

[["dc.bibliographiccitation.firstpage","3026"],["dc.bibliographiccitation.issue","24"],["dc.bibliographiccitation.journal","Electrophoresis"],["dc.bibliographiccitation.lastpage","3033"],["dc.bibliographiccitation.volume","36"],["dc.contributor.author","Arora, Amandeep Singh"],["dc.contributor.author","Zafar, Saima"],["dc.contributor.author","Kollmar, Otto"],["dc.contributor.author","Llorens, Franc"],["dc.contributor.author","Tahir, Waqas"],["dc.contributor.author","Vanselow, Sven"],["dc.contributor.author","Kumar, Prateek"],["dc.contributor.author","Schmerr, Mary Jo"],["dc.contributor.author","Schmitz, Matthias"],["dc.contributor.author","Zerr, Inga"],["dc.date.accessioned","2018-11-07T09:47:59Z"],["dc.date.available","2018-11-07T09:47:59Z"],["dc.date.issued","2015"],["dc.description.abstract","The cellular prion protein (PrPC) is a glycoprotein, anchored to the plasma membrane and abundantly expressed in the central nervous system. The expression of PrPC in the peripheral tissues is low and only little information is available on its functions in the nonneuronal tissues. The antioxidant function of PrPC during the activation of hepatic stellate cells has already been reported. Therefore, the aim of the study was to expand our knowledge on the functions of PrPC by detailed characterization of its expressional profile in the liver. In a combined strategy by using capillary immunoelectrophoresis and standard techniques, we have shown a sexually dimorphic expression of PrPC in mice and human liver tissues. Further, we showed a significant age-dependent upregulation of PrPC expression in the liver of 14-and 9-month-old mice as compared to 3 months of age. Therefore, this study may provide new insights into the gender-specific role of PrPC in the liver, which may further be linked to its protective role against oxidative stress during aging. In addition, the current study also shows an application of immunoelectrophoresis with a low coefficient of variation to analyze the miniscule amount of PrPC in the mouse liver tissue."],["dc.identifier.doi","10.1002/elps.201500244"],["dc.identifier.isi","000368028200007"],["dc.identifier.pmid","26377521"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/35217"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","1522-2683"],["dc.relation.issn","0173-0835"],["dc.title","Application of capillary immunoelectrophoresis revealed an age- and gender-dependent regulated expression of PrPC in liver"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","517"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Molecular Neurobiology"],["dc.bibliographiccitation.lastpage","537"],["dc.bibliographiccitation.volume","55"],["dc.contributor.author","Tahir, Waqas"],["dc.contributor.author","Zafar, Saima"],["dc.contributor.author","Llorens, Franc"],["dc.contributor.author","Arora, Amandeep Singh"],["dc.contributor.author","Thüne, Katrin"],["dc.contributor.author","Schmitz, Matthias"],["dc.contributor.author","Gotzmann, Nadine"],["dc.contributor.author","Kruse, Niels"],["dc.contributor.author","Mollenhauer, Brit"],["dc.contributor.author","Torres, Juan Maria"],["dc.contributor.author","Andréoletti, Olivier"],["dc.contributor.author","Ferrer, Isidre"],["dc.contributor.author","Zerr, Inga"],["dc.date.accessioned","2020-12-10T14:14:25Z"],["dc.date.available","2020-12-10T14:14:25Z"],["dc.date.issued","2016"],["dc.identifier.doi","10.1007/s12035-016-0294-4"],["dc.identifier.eissn","1559-1182"],["dc.identifier.issn","0893-7648"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/71342"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Molecular Alterations in the Cerebellum of Sporadic Creutzfeldt–Jakob Disease Subtypes with DJ-1 as a Key Regulator of Oxidative Stress"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]