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Basheer N, Buee L, Brion JP, Smolek T, Muhammadi MK, Hritz J, Hromadka T, Dewachter I, Wegmann S, Landrieu I, Novak P, Mudher A, Zilka N. Shaping the future of preclinical development of successful disease-modifying drugs against Alzheimer's disease: a systematic review of tau propagation models. Acta Neuropathol Commun 2024; 12:52. [PMID: 38576010 PMCID: PMC10993623 DOI: 10.1186/s40478-024-01748-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2024] [Accepted: 02/21/2024] [Indexed: 04/06/2024] Open
Abstract
The transcellular propagation of the aberrantly modified protein tau along the functional brain network is a key hallmark of Alzheimer's disease and related tauopathies. Inoculation-based tau propagation models can recapitulate the stereotypical spread of tau and reproduce various types of tau inclusions linked to specific tauopathy, albeit with varying degrees of fidelity. With this systematic review, we underscore the significance of judicious selection and meticulous functional, biochemical, and biophysical characterization of various tau inocula. Furthermore, we highlight the necessity of choosing suitable animal models and inoculation sites, along with the critical need for validation of fibrillary pathology using confirmatory staining, to accurately recapitulate disease-specific inclusions. As a practical guide, we put forth a framework for establishing a benchmark of inoculation-based tau propagation models that holds promise for use in preclinical testing of disease-modifying drugs.
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Affiliation(s)
- Neha Basheer
- Institute of Neuroimmunology, Slovak Academy of Sciences, Dubravska Cesta 9, 845 10, Bratislava, Slovakia
| | - Luc Buee
- Inserm, CHU Lille, CNRS, LilNCog - Lille Neuroscience & Cognition, University of Lille, 59000, Lille, France.
| | - Jean-Pierre Brion
- Faculty of Medicine, Laboratory of Histology, Alzheimer and Other Tauopathies Research Group (CP 620), ULB Neuroscience Institute (UNI), Université Libre de Bruxelles, 808, Route de Lennik, 1070, Brussels, Belgium
| | - Tomas Smolek
- Institute of Neuroimmunology, Slovak Academy of Sciences, Dubravska Cesta 9, 845 10, Bratislava, Slovakia
| | - Muhammad Khalid Muhammadi
- Institute of Neuroimmunology, Slovak Academy of Sciences, Dubravska Cesta 9, 845 10, Bratislava, Slovakia
| | - Jozef Hritz
- CEITEC Masaryk University, Kamenice 5, 625 00, Brno, Czech Republic
- Department of Chemistry, Faculty of Science, Masaryk University, Kamenice 5, 62500, Brno, Czech Republic
| | - Tomas Hromadka
- Institute of Neuroimmunology, Slovak Academy of Sciences, Dubravska Cesta 9, 845 10, Bratislava, Slovakia
| | - Ilse Dewachter
- Biomedical Research Institute, BIOMED, Hasselt University, 3500, Hasselt, Belgium
| | - Susanne Wegmann
- German Center for Neurodegenerative Diseases, Charitéplatz 1, 10117, Berlin, Germany
- Einstein Center for Neurosciences Berlin, Charité - Universitätsmedizin Berlin, Berlin, Germany
| | - Isabelle Landrieu
- CNRS EMR9002 - BSI - Integrative Structural Biology, 59000, Lille, France
- Inserm, CHU Lille, Institut Pasteur de Lille, U1167 - RID-AGE - Risk Factors and Molecular Determinants of Aging-Related Diseases, University of Lille, 59000, Lille, France
| | - Petr Novak
- Institute of Neuroimmunology, Slovak Academy of Sciences, Dubravska Cesta 9, 845 10, Bratislava, Slovakia
| | - Amritpal Mudher
- School of Biological Sciences, Faculty of Environment and Life Sciences, University of Southampton, Highfield Campus, Southampton, SO17 1BJ, UK
| | - Norbert Zilka
- Institute of Neuroimmunology, Slovak Academy of Sciences, Dubravska Cesta 9, 845 10, Bratislava, Slovakia.
- AXON Neuroscience R&D Services SE, Dubravska Cesta 9, 845 10, Bratislava, Slovakia.
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Gracheva M, Klencsár Z, Homonnay Z, Solti Á, Péter L, Machala L, Novak P, Kovács K. Revealing the nuclearity of iron citrate complexes at biologically relevant conditions. Biometals 2024; 37:461-475. [PMID: 38110781 PMCID: PMC11006783 DOI: 10.1007/s10534-023-00562-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Accepted: 11/09/2023] [Indexed: 12/20/2023]
Abstract
Citric acid plays an ubiquitous role in the complexation of essential metals like iron and thus it has a key function making them biologically available. For this, iron(III) citrate complexes are considered among the most significant coordinated forms of ferric iron that take place in biochemical processes of all living organisms. Although these systems hold great biological relevance, their coordination chemistry has not been fully elucidated yet. The current study aimed to investigate the speciation of iron(III) citrate using Mössbauer and electron paramagnetic resonance spectroscopies. Our aim was to gain insights into the structure and nuclearity of the complexes depending on the pH and iron to citrate ratio. By applying the frozen solution technique, the results obtained directly reflect the iron speciation present in the aqueous solution. At 1:1 iron:citrate molar ratio, polynuclear species prevailed forming most probably a trinuclear structure. In the case of citrate excess, the coexistence of several monoiron species with different coordination environments was confirmed. The stability of the polynuclear complexes was checked in the presence of organic solvents.
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Affiliation(s)
- Maria Gracheva
- Department of Analytical Chemistry, Institute of Chemistry, ELTE Eötvös Loránd University, Pázmány P. s. 1/A, 1117, Budapest, Hungary
- Nuclear Analysis and Radiography Department, Centre for Energy Research, Konkoly-Thege Miklós út. 29-33, 1121, Budapest, Hungary
| | - Zoltán Klencsár
- Nuclear Analysis and Radiography Department, Centre for Energy Research, Konkoly-Thege Miklós út. 29-33, 1121, Budapest, Hungary
| | - Zoltán Homonnay
- Department of Analytical Chemistry, Institute of Chemistry, ELTE Eötvös Loránd University, Pázmány P. s. 1/A, 1117, Budapest, Hungary
| | - Ádám Solti
- Department of Plant Physiology and Molecular Plant Biology, Institute of Biology, ELTE Eötvös Loránd University, Pázmány Péter s. 1/C, 1117, Budapest, Hungary
| | - László Péter
- Department of Complex Fluids, Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Konkoly-Thege Miklós út 29-33, 1121, Budapest, Hungary
| | - Libor Machala
- Department of Experimental Physics, Faculty of Science, Palacký University Olomouc, 17. listopadu 1192/12, 771 46, Olomouc, Czech Republic
| | - Petr Novak
- Department of Experimental Physics, Faculty of Science, Palacký University Olomouc, 17. listopadu 1192/12, 771 46, Olomouc, Czech Republic
| | - Krisztina Kovács
- Department of Analytical Chemistry, Institute of Chemistry, ELTE Eötvös Loránd University, Pázmány P. s. 1/A, 1117, Budapest, Hungary.
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Asante K, Novak P. Predicting nurses' safety compliance behaviour in a developing economy, using the theory of planned behaviour: A configurational approach. J Adv Nurs 2024; 80:1097-1110. [PMID: 37694803 DOI: 10.1111/jan.15846] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2023] [Revised: 08/06/2023] [Accepted: 08/28/2023] [Indexed: 09/12/2023]
Abstract
AIM The study's main objective was to use a fuzzy set qualitative comparative analysis to identify the configuration of recipes that predict nurses' safety compliance behaviour. DESIGN A cross-sectional design. METHODS A survey was used where questionnaires were collected from 285 nurses across four primary healthcare hospitals within the Ashanti Region, Ghana. The data collection happened between June 1 to August 2, 2022. A fuzzy set qualitative comparative analysis was used to identify the recipes of psychological factors that determine nurses' safety compliance behaviour. RESULTS Results from the study suggest that the necessary configurations that explained nurses' safety compliance behaviour came from the presence of subjective norm, attitude, perceived behavioural control, perceived organizational support and negation of intention. The result highlights the need for safety protocols to be conscious of the interplay between nurses' assessment of self, social clues and perception of management care and support since such psychological factors must be considered concurrently to achieve the optimal safety compliance behaviour among nurses. CONCLUSION A health and safety protocol that fails to recognize the importance of psychological antecedents on subordinates' safety compliance behaviour could limit the safety policy's usefulness in bringing the appropriate behavioural change in nurses. IMPACT To date, no study has combined the antecedents of theory planned behaviour with perceived organizational support and cue to action to assess how they collectively predict nurses' safety compliance behaviour. Findings from the study suggest that nurses in primary health facilities inform their safety compliance behaviour by assessing self-capabilities, social signals from superiors and colleagues and perception of management support. Hospital administrators and nursing managers in sub-Saharan Africa may rely on these psychological forces to persuade nurses to develop positive safety compliance behaviour at the health facility. PATIENT OR PUBLIC CONTRIBUTION No Patient or Public Contribution.
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Affiliation(s)
| | - Petr Novak
- Tomas Bata University in Zlin, Zlin, Czech Republic
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Zakopcanik M, Kavan D, Novak P, Loginov DS. Quantifying the Impact of the Peptide Identification Framework on the Results of Fast Photochemical Oxidation of Protein Analysis. J Proteome Res 2024; 23:609-617. [PMID: 38158558 PMCID: PMC10845142 DOI: 10.1021/acs.jproteome.3c00390] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Revised: 10/17/2023] [Accepted: 12/06/2023] [Indexed: 01/03/2024]
Abstract
Fast Photochemical Oxidation of Proteins (FPOP) is a promising technique for studying protein structure and dynamics. The quality of insight provided by FPOP depends on the reliability of the determination of the modification site. This study investigates the performance of two search engines, Mascot and PEAKS, for the data processing of FPOP analyses. Comparison of Mascot and PEAKS of the hemoglobin--haptoglobin Bruker timsTOF data set (PXD021621) revealed greater consistency in the Mascot identification of modified peptides, with around 26% of the IDs being mutual for all three replicates, compared to approximately 22% for PEAKS. The intersection between Mascot and PEAKS results revealed a limited number (31%) of shared modified peptides. Principal Component Analysis (PCA) using the peptide-spectrum match (PSM) score, site probability, and peptide intensity was applied to evaluate the results, and the analyses revealed distinct clusters of modified peptides. Mascot showed the ability to assess confident site determination, even with lower PSM scores. However, high PSM scores from PEAKS did not guarantee a reliable determination of the modification site. Fragmentation coverage of the modification position played a crucial role in Mascot assignments, while the AScore localizations from PEAKS often become ambiguous because the software employs MS/MS merging.
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Affiliation(s)
- Marek Zakopcanik
- Institute
of Microbiology, The Czech Academy of Sciences, 14220 Prague, Czech Republic
- Department
of Biochemistry, Faculty of Science, Charles
University, 12820 Prague, Czech Republic
| | - Daniel Kavan
- Institute
of Microbiology, The Czech Academy of Sciences, 14220 Prague, Czech Republic
| | - Petr Novak
- Institute
of Microbiology, The Czech Academy of Sciences, 14220 Prague, Czech Republic
| | - Dmitry S. Loginov
- Institute
of Microbiology, The Czech Academy of Sciences, 14220 Prague, Czech Republic
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Cullen NC, Novak P, Tosun D, Kovacech B, Hanes J, Kontsekova E, Fresser M, Ropele S, Feldman HH, Schmidt R, Winblad B, Zilka N. Efficacy assessment of an active tau immunotherapy in Alzheimer's disease patients with amyloid and tau pathology: a post hoc analysis of the "ADAMANT" randomised, placebo-controlled, double-blind, multi-centre, phase 2 clinical trial. EBioMedicine 2024; 99:104923. [PMID: 38101301 PMCID: PMC10733085 DOI: 10.1016/j.ebiom.2023.104923] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Revised: 11/30/2023] [Accepted: 12/01/2023] [Indexed: 12/17/2023] Open
Abstract
BACKGROUND Tau pathology correlates with and predicts clinical decline in Alzheimer's disease. Approved tau-targeted therapies are not available. METHODS ADAMANT, a 24-month randomised, placebo-controlled, parallel-group, double-blinded, multicenter, Phase 2 clinical trial (EudraCT2015-000630-30, NCT02579252) enrolled 196 participants with Alzheimer's disease; 119 are included in this post-hoc subgroup analysis. AADvac1, active immunotherapy against pathological tau protein. A machine learning model predicted likely Amyloid+Tau+ participants from baseline MRI. STATISTICAL METHODS MMRM for change from baseline in cognition, function, and neurodegeneration; linear regression for associations between antibody response and endpoints. RESULTS The prediction model achieved PPV of 97.7% for amyloid, 96.2% for tau. 119 participants in the full analysis set (70 treatment and 49 placebo) were classified as A+T+. A trend for CDR-SB 104-week change (estimated marginal means [emm] = -0.99 points, 95% CI [-2.13, 0.13], p = 0.0825]) and ADCS-MCI-ADL (emm = 3.82 points, CI [-0.29, 7.92], p = 0.0679) in favour of the treatment group was seen. Reduction was seen in plasma NF-L (emm = -0.15 log pg/mL, CI [-0.27, -0.03], p = 0.0139). Higher antibody response to AADvac1 was related to slowing of decline on CDR-SB (rho = -0.10, CI [-0.21, 0.01], p = 0.0376) and ADL (rho = 0.15, CI [0.03, 0.27], p = 0.0201), and related to slower brain atrophy (rho = 0.18-0.35, p < 0.05 for temporal volume, whole cortex, and right and left hippocampus). CONCLUSIONS In the subgroup of ML imputed or CSF identified A+T+, AADvac1 slowed AD-related decline in an antibody-dependent manner. Larger anti-tau trials are warranted. FUNDING AXON Neuroscience SE.
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Affiliation(s)
| | - Petr Novak
- Axon Neuroscience CRM Services, Bratislava, Slovakia.
| | - Duygu Tosun
- San Francisco Veterans Affairs Medical Center, San Francisco, CA, USA; Department of Radiology and Biomedical Imaging, University of California San Francisco, CA, USA
| | | | - Jozef Hanes
- Axon Neuroscience R&D Services, Bratislava, Slovakia
| | | | | | - Stefan Ropele
- Clinical Division of General Neurology, Department of Neurology, Medical University Graz, Graz, Austria
| | - Howard H Feldman
- Department of Neurosciences, Alzheimer's Disease Cooperative Study, University of California San Diego, La Jolla, CA, USA
| | - Reinhold Schmidt
- Clinical Division of Neurogeriatrics, Department of Neurology, Medical University Graz, Graz, Austria
| | - Bengt Winblad
- Karolinska Institutet, Department of NVS, Division of Neurogeriatrics, Solna, Sweden and Karolinska University Hospital, Theme Inflammation and Aging, Huddinge, Sweden
| | - Norbert Zilka
- Axon Neuroscience R&D Services, Bratislava, Slovakia
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Lambert T, Gramlich M, Stutzke L, Smith L, Deng D, Kaiser PD, Rothbauer U, Benesch JLP, Wagner C, Koenig M, Pompach P, Novak P, Zeck A, Rand KD. Development of a PNGase Rc Column for Online Deglycosylation of Complex Glycoproteins during HDX-MS. J Am Soc Mass Spectrom 2023; 34:2556-2566. [PMID: 37756257 PMCID: PMC10623573 DOI: 10.1021/jasms.3c00268] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2023] [Revised: 09/04/2023] [Accepted: 09/06/2023] [Indexed: 09/29/2023]
Abstract
Protein glycosylation is one of the most common PTMs and many cell surface receptors, extracellular proteins, and biopharmaceuticals are glycosylated. However, HDX-MS analysis of such important glycoproteins has so far been limited by difficulties in determining the HDX of the protein segments that contain glycans. We have developed a column containing immobilized PNGase Rc (from Rudaea cellulosilytica) that can readily be implemented into a conventional HDX-MS setup to allow improved analysis of glycoproteins. We show that HDX-MS with the PNGase Rc column enables efficient online removal of N-linked glycans and the determination of the HDX of glycosylated regions in several complex glycoproteins. Additionally, we use the PNGase Rc column to perform a comprehensive HDX-MS mapping of the binding epitope of a mAb to c-Met, a complex glycoprotein drug target. Importantly, the column retains high activity in the presence of common quench-buffer additives like TCEP and urea and performed consistent across 114 days of extensive use. Overall, our work shows that HDX-MS with the integrated PNGase Rc column can enable fast and efficient online deglycosylation at harsh quench conditions to provide comprehensive analysis of complex glycoproteins.
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Affiliation(s)
- Thomas Lambert
- Department
of Pharmacy, University of Copenhagen, 2100 Copenhagen, Denmark
| | - Marius Gramlich
- NMI
Natural and Medical Sciences Institute at the University of Tübingen, 72770 Reutlingen, Germany
| | - Luisa Stutzke
- Department
of Pharmacy, University of Copenhagen, 2100 Copenhagen, Denmark
| | - Luke Smith
- Physical
and Theoretical Chemistry Laboratory, Department of Chemistry, University of Oxford, OX1 3QZ Oxford, England
| | - Dingyu Deng
- Department
of Pharmacy, University of Copenhagen, 2100 Copenhagen, Denmark
| | - Philipp D. Kaiser
- NMI
Natural and Medical Sciences Institute at the University of Tübingen, 72770 Reutlingen, Germany
| | - Ulrich Rothbauer
- NMI
Natural and Medical Sciences Institute at the University of Tübingen, 72770 Reutlingen, Germany
- Pharmaceutical
Biotechnology, Eberhard Karls University, 72074 Tübingen, Germany
| | - Justin L. P. Benesch
- Physical
and Theoretical Chemistry Laboratory, Department of Chemistry, University of Oxford, OX1 3QZ Oxford, England
| | - Cornelia Wagner
- Roche
Pharma Research and Early Development, Large Molecule Research, Roche Innovation Center Munich, 82377 Penzberg, Germany
| | - Maximiliane Koenig
- Roche
Pharma Research and Early Development, Large Molecule Research, Roche Innovation Center Munich, 82377 Penzberg, Germany
| | - Petr Pompach
- BioCev,
Institute of Biotechnology of the CAS, 252 50 Prumyslova, Czech Republic
| | - Petr Novak
- BioCeV,
Institute of Microbiology of the CAS, 142 20 Prumyslova, Czech Republic
| | - Anne Zeck
- NMI
Natural and Medical Sciences Institute at the University of Tübingen, 72770 Reutlingen, Germany
| | - Kasper D. Rand
- Department
of Pharmacy, University of Copenhagen, 2100 Copenhagen, Denmark
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Basheer N, Smolek T, Hassan I, Liu F, Iqbal K, Zilka N, Novak P. Does modulation of tau hyperphosphorylation represent a reasonable therapeutic strategy for Alzheimer's disease? From preclinical studies to the clinical trials. Mol Psychiatry 2023; 28:2197-2214. [PMID: 37264120 PMCID: PMC10611587 DOI: 10.1038/s41380-023-02113-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/07/2022] [Revised: 04/28/2023] [Accepted: 05/05/2023] [Indexed: 06/03/2023]
Abstract
Protein kinases (PKs) have emerged as one of the most intensively investigated drug targets in current pharmacological research, with indications ranging from oncology to neurodegeneration. Tau protein hyperphosphorylation was the first pathological post-translational modification of tau protein described in Alzheimer's disease (AD), highlighting the role of PKs in neurodegeneration. The therapeutic potential of protein kinase inhibitors (PKIs)) and protein phosphatase 2 A (PP2A) activators in AD has recently been explored in several preclinical and clinical studies with variable outcomes. Where a number of preclinical studies demonstrate a visible reduction in the levels of phospho-tau in transgenic tauopathy models, no reduction in neurofibrillary lesions is observed. Amongst the few PKIs and PP2A activators that progressed to clinical trials, most failed on the efficacy front, with only a few still unconfirmed and potential positive trends. This suggests that robust preclinical and clinical data is needed to unequivocally evaluate their efficacy. To this end, we take a systematic look at the results of preclinical and clinical studies of PKIs and PP2A activators, and the evidence they provide regarding the utility of this approach to evaluate the potential of targeting tau hyperphosphorylation as a disease modifying therapy.
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Affiliation(s)
- Neha Basheer
- Institute of Neuroimmunology, Slovak Academy of Sciences, Bratislava, 845 10, Slovakia
| | - Tomáš Smolek
- Institute of Neuroimmunology, Slovak Academy of Sciences, Bratislava, 845 10, Slovakia
| | - Imtaiyaz Hassan
- Centre for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia, Jamia Nagar, New Delhi, 110025, India
| | - Fei Liu
- Department of Neurochemistry, Inge Grundke-Iqbal Research Floor, New York State Institute for Basic Research in Developmental Disabilities, 1050 Forest Hill Road, Staten Island, NY, 10314, USA
| | - Khalid Iqbal
- Department of Neurochemistry, Inge Grundke-Iqbal Research Floor, New York State Institute for Basic Research in Developmental Disabilities, 1050 Forest Hill Road, Staten Island, NY, 10314, USA
| | - Norbert Zilka
- Institute of Neuroimmunology, Slovak Academy of Sciences, Bratislava, 845 10, Slovakia.
- AXON Neuroscience R&D Services SE, Bratislava, 811 02, Slovakia.
| | - Petr Novak
- Institute of Neuroimmunology, Slovak Academy of Sciences, Bratislava, 845 10, Slovakia.
- AXON Neuroscience CRM Services SE, Bratislava, 811 02, Slovakia.
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8
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Alquezar-Artieda N, Kuzilkova D, Roberts J, Hlozkova K, Pecinova A, Pecina P, Zwyrtkova M, Potuckova E, Kavan D, Hermanova I, Zaliova M, Novak P, Mracek T, Sramkova L, Tennant DA, Trka J, Starkova J. Restored biosynthetic pathways induced by MSCs serve as rescue mechanism in leukemia cells after L-asparaginase therapy. Blood Adv 2023; 7:2228-2236. [PMID: 36399517 PMCID: PMC10196988 DOI: 10.1182/bloodadvances.2021006431] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2021] [Revised: 10/21/2022] [Accepted: 11/07/2022] [Indexed: 11/19/2022] Open
Affiliation(s)
- Natividad Alquezar-Artieda
- Childhood Leukaemia Investigation Prague, Prague, Czech Republic
- Second Faculty of Medicine, Department of Pediatric Hematology and Oncology, Charles University, Prague, Czech Republic
| | - Daniela Kuzilkova
- Childhood Leukaemia Investigation Prague, Prague, Czech Republic
- Second Faculty of Medicine, Department of Pediatric Hematology and Oncology, Charles University, Prague, Czech Republic
- University Hospital Motol, Prague, Czech Republic
| | - Jennie Roberts
- Institute of Metabolism and Systems Research, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Katerina Hlozkova
- Childhood Leukaemia Investigation Prague, Prague, Czech Republic
- Second Faculty of Medicine, Department of Pediatric Hematology and Oncology, Charles University, Prague, Czech Republic
| | - Alena Pecinova
- Department of Bioenergetics, Institute of Physiology of the Czech Academy of Science, Prague, Czech Republic
| | - Petr Pecina
- Department of Bioenergetics, Institute of Physiology of the Czech Academy of Science, Prague, Czech Republic
| | - Martina Zwyrtkova
- Childhood Leukaemia Investigation Prague, Prague, Czech Republic
- Second Faculty of Medicine, Department of Pediatric Hematology and Oncology, Charles University, Prague, Czech Republic
| | - Eliska Potuckova
- Childhood Leukaemia Investigation Prague, Prague, Czech Republic
- Second Faculty of Medicine, Department of Pediatric Hematology and Oncology, Charles University, Prague, Czech Republic
| | - Daniel Kavan
- Laboratory of Structural Biology and Cell Signalling, Institute of Microbiology, Academy of Science of the Czech Republic, Prague, Czech Republic
| | - Ivana Hermanova
- Childhood Leukaemia Investigation Prague, Prague, Czech Republic
- Second Faculty of Medicine, Department of Pediatric Hematology and Oncology, Charles University, Prague, Czech Republic
| | - Marketa Zaliova
- Childhood Leukaemia Investigation Prague, Prague, Czech Republic
- Second Faculty of Medicine, Department of Pediatric Hematology and Oncology, Charles University, Prague, Czech Republic
- University Hospital Motol, Prague, Czech Republic
| | - Petr Novak
- Laboratory of Structural Biology and Cell Signalling, Institute of Microbiology, Academy of Science of the Czech Republic, Prague, Czech Republic
| | - Tomas Mracek
- Department of Bioenergetics, Institute of Physiology of the Czech Academy of Science, Prague, Czech Republic
| | - Lucie Sramkova
- Second Faculty of Medicine, Department of Pediatric Hematology and Oncology, Charles University, Prague, Czech Republic
- University Hospital Motol, Prague, Czech Republic
| | - Daniel A. Tennant
- Institute of Metabolism and Systems Research, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Jan Trka
- Childhood Leukaemia Investigation Prague, Prague, Czech Republic
- Second Faculty of Medicine, Department of Pediatric Hematology and Oncology, Charles University, Prague, Czech Republic
- University Hospital Motol, Prague, Czech Republic
| | - Julia Starkova
- Childhood Leukaemia Investigation Prague, Prague, Czech Republic
- Second Faculty of Medicine, Department of Pediatric Hematology and Oncology, Charles University, Prague, Czech Republic
- University Hospital Motol, Prague, Czech Republic
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9
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Dvorak J, Novakova J, Kraftova L, Studentova V, Matejovic M, Radej J, Karvunidis T, Horak J, Kralovcova M, Hrabak J, Kalaninova Z, Volny M, Novak P, Pompach P. The rapid detection of procalcitonin in septic serum using immunoaffinity MALDI chips. Clin Proteomics 2023; 20:20. [PMID: 37170190 PMCID: PMC10176672 DOI: 10.1186/s12014-023-09410-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2022] [Accepted: 04/27/2023] [Indexed: 05/13/2023] Open
Abstract
BACKGROUND Sepsis is a common worldwide health condition with high mortality. It is caused by a dysregulated immune response to the pathogen. Severe infections resulting in sepsis can be also determined by monitoring several bloodstream biomarkers, one of them being pro-hormone procalcitonin (PCT). PCT concentration in the bloodstream correlates well with sepsis and in severe cases increases up to a thousand times from the healthy physiological values in a short time. In this study, we developed a rapid technique for PCT detection by MALDI-TOF mass spectrometry, that uses in-situ enrichment directly on the specialized immuno MALDI chips that are utilized as MALDI plates. The method's ability to detect PCT was confirmed by comparing the results with LC-MS bottom-up workflow. The new method detects intact PCT by its m/z and uncovers its alternations in septic serum. METHODS The MALDI chips used for the detection of PCT were prepared by ambient ion soft landing of anti-PCT antibody on an ITO glass slide. The chips were used for the development of the rapid MALDI-TOF MS method. A parallel method based on affinity enrichment on magnetic beads followed by LC-MS/MS data-dependent peptide microsequencing was used to prove PCT presence in the sample. All samples were also tested by ELISA to determine PCT concentration prior to analyzing them by mass spectrometry methods. RESULTS The MALDI chip method was optimized using recombinant PCT spiked into the human serum. The PCT detection limit was 10 ng/mL. The optimized method was used to analyze 13 sera from patients suffering sepsis. The PCT results were confirmed by LC-MS/MS. The measurement of the intact PCT by the MALDI chip method revealed that sera of patients with severe sepsis have other forms of PCT present, which show post-processing of the primary sequence by cleavage of PCT, resulting in the formation of N and C termini fragments. CONCLUSIONS Procalcitonin from human serum was successfully enriched and detected using immunoaffinity MALDI chips. The intact PCT was characterized in 13 septic patients. The method is more specific compared to non-MS-based immunoaffinity techniques and allows observation of different variants of PCT in septic patients.
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Affiliation(s)
- Josef Dvorak
- Department of Biochemistry, Faculty of Science, Charles University, Prague, Czech Republic
- Institute of Microbiology, The Czech Academy of Science, Prague, Czech Republic
| | - Jana Novakova
- Institute of Microbiology, The Czech Academy of Science, Prague, Czech Republic
| | - Lucie Kraftova
- Biomedical Center, Faculty of Medicine in Pilsen, Charles University, Pilsen, Czech Republic
| | - Vendula Studentova
- Biomedical Center, Faculty of Medicine in Pilsen, Charles University, Pilsen, Czech Republic
| | - Martin Matejovic
- Biomedical Center, Faculty of Medicine in Pilsen, Charles University, Pilsen, Czech Republic
- Department of Internal Medicine, Faculty of Medicine in Pilsen, Pilsen University Hospital, Charles University, Pilsen, Czech Republic
| | - Jaroslav Radej
- Biomedical Center, Faculty of Medicine in Pilsen, Charles University, Pilsen, Czech Republic
- Department of Internal Medicine, Faculty of Medicine in Pilsen, Pilsen University Hospital, Charles University, Pilsen, Czech Republic
| | - Thomas Karvunidis
- Biomedical Center, Faculty of Medicine in Pilsen, Charles University, Pilsen, Czech Republic
- Department of Internal Medicine, Faculty of Medicine in Pilsen, Pilsen University Hospital, Charles University, Pilsen, Czech Republic
| | - Jan Horak
- Biomedical Center, Faculty of Medicine in Pilsen, Charles University, Pilsen, Czech Republic
- Department of Internal Medicine, Faculty of Medicine in Pilsen, Pilsen University Hospital, Charles University, Pilsen, Czech Republic
| | - Marcela Kralovcova
- Department of Internal Medicine, Faculty of Medicine in Pilsen, Pilsen University Hospital, Charles University, Pilsen, Czech Republic
| | - Jaroslav Hrabak
- Biomedical Center, Faculty of Medicine in Pilsen, Charles University, Pilsen, Czech Republic
| | - Zuzana Kalaninova
- Department of Biochemistry, Faculty of Science, Charles University, Prague, Czech Republic
- Institute of Microbiology, The Czech Academy of Science, Prague, Czech Republic
| | - Michael Volny
- Institute of Microbiology, The Czech Academy of Science, Prague, Czech Republic
| | - Petr Novak
- Department of Biochemistry, Faculty of Science, Charles University, Prague, Czech Republic
- Institute of Microbiology, The Czech Academy of Science, Prague, Czech Republic
| | - Petr Pompach
- Department of Biochemistry, Faculty of Science, Charles University, Prague, Czech Republic.
- Institute of Microbiology, The Czech Academy of Science, Prague, Czech Republic.
- Institute of Biotechnology, The Czech Academy of Science, Prague, Czech Republic.
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10
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Piszczek P, Wojcik-Piotrowicz K, Nowak B, Guzdek P, Novak P, Pytko-Polonczyk J, Gil K, Kaszuba-Zwoinska J. Phagocytosis of latex beads by a human monocytic Mono Mac 6 cell line and effects of low-frequency electromagnetic field interaction. J Physiol Pharmacol 2023; 74. [PMID: 37453098 DOI: 10.26402/jpp.2023.2.10] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Received: 02/24/2023] [Accepted: 04/30/2023] [Indexed: 07/18/2023]
Abstract
Some studies have shown that electromagnetic fields (EMFs) may impact immune response cells and their functions. The first stage of the defense from pathogens is innate immunity encompassing phagocytosis and phagocytosis-related intracellular effects. Our work aimed to determine the influence of a low-frequency electromagnetic field (7 Hz, 30 mTrms) on the phagocytosis process of latex beads (LBs), the production of reactive oxygen species (ROS), and viability changes in a human monocytic Mono Mac 6 (MM6) cell line as an experimental model of the phagocytosing cells in in vitro cell culture conditions. For these purposes, cells were firstly activated with infectious agents such as lipopolysaccharide (LPS), Staphylococcal enterotoxin B (SEB), or the proliferatory agent phytohaemagglutinin (PHA), and then a phagocytosis test was performed. Cell viability and range of phagocytosis of latex beads by MM6 cells were measured by flow cytometry, and the level of ROS was evaluated with the use of a cytochrome C reduction test. The obtained results revealed that applied EMF exposure mainly increased the necrosis parameter of cell death when they were pre-stimulated with SEB as an infectious factor and subsequently phagocytosed LBs (P=0.001). Prestimulation with other agents like LPS or PHA preceding phagocytosis resulted in no statistically significant changes in cell death parameters. The level of ROS depended on the used stimulatory agent, phagocytosis, and/or EMF exposure. The obtained effects for EMF exposure indicated only a slight decrease in the ROS level for cells phagocytosing latex beads and being treated with SEB or PHA, while the opposite effect was observed for LPS pre-stimulated cells (data not statistically significant). The results concerning the viability of phagocytosing cells, the effectiveness of the phagocytosis process, and the level of radical forms might result from applied EMF parameters like signal waveform, frequency, flux density, and especially single EMF exposure.
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Affiliation(s)
- P Piszczek
- Department of Pathophysiology, Jagiellonian University Medical College, Cracow, Poland.
| | - K Wojcik-Piotrowicz
- Department of Biophysics, Jagiellonian University Medical College, Cracow, Poland
| | - B Nowak
- Department of Immunology, Jagiellonian University Medical College, Cracow, Poland
| | - P Guzdek
- Lukasiewicz Research Network - Institute of Microelectronics and Photonics, Warsaw, Poland
| | - P Novak
- Institute of Dentistry, Department of Integrated Dentistry, Jagiellonian University Medical College, Cracow, Poland
| | - J Pytko-Polonczyk
- Institute of Dentistry, Department of Integrated Dentistry, Jagiellonian University Medical College, Cracow, Poland
| | - K Gil
- Department of Pathophysiology, Jagiellonian University Medical College, Cracow, Poland
| | - J Kaszuba-Zwoinska
- Department of Pathophysiology, Jagiellonian University Medical College, Cracow, Poland
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11
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White JP, Schembri A, Prenn-Gologranc C, Ondrus M, Katina S, Novak P, Lim YY, Edgar C, Maruff P. Sensitivity of Individual and Composite Test Scores from the Cogstate Brief Battery to Mild Cognitive Impairment and Dementia Due to Alzheimer's Disease. J Alzheimers Dis 2023; 96:1781-1799. [PMID: 38007647 DOI: 10.3233/jad-230352] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2023]
Abstract
BACKGROUND The Cogstate Brief Battery (CBB) is a computerized cognitive test battery used commonly to identify cognitive deficits related to Alzheimer's disease (AD). However, AD and normative samples used to understand the sensitivity of the CBB to AD in the clinic have been limited, as have the outcome measures studied. OBJECTIVE This study investigated the sensitivity of CBB outcomes, including potential composite scores, to cognitive impairment in mild cognitive impairment (MCI) and dementia due to AD, in carefully selected samples. METHODS Samples consisted of 4,871 cognitively unimpaired adults and 184 adults who met clinical criteria for MCI (Clinical Dementia Rating (CDR) = 0.5) or dementia (CDR > 0.5) due to AD and CBB naive. Speed and accuracy measures from each test were examined, and theoretically- and statistically-derived composites were created. Sensitivity and specificity of classification of cognitive impairment were compared between outcomes. RESULTS Individual CBB measures of learning and working memory showed high discriminability for AD-related cognitive impairment for CDR 0.5 (AUCs ∼ 0.79-0.88), and CDR > 0.5 (AUCs ∼ 0.89-0.96) groups. Discrimination ability for theoretically derived CBB composite measures was high, particularly for the Learning and Working Memory (LWM) composite (CDR 0.5 AUC = 0.90, CDR > 0.5 AUC = 0.97). As expected, statistically optimized linear composite measures showed strong discrimination abilities albeit similar to the LWM composite. CONCLUSIONS In older adults, the CBB is effective for discriminating cognitive impairment due to MCI or AD-dementia from unimpaired cognition with the LWM composite providing the strongest sensitivity.
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Affiliation(s)
| | | | | | | | - Stanislav Katina
- AXON Neuroscience CRM Services SE, Bratislava, Slovakia
- Institute of Mathematics and Statistics, Faculty of Science, Masaryk University, Brno, Czech Republic
| | - Petr Novak
- AXON Neuroscience CRM Services SE, Bratislava, Slovakia
| | - Yen Ying Lim
- Turner Institute for Brain and Mental Health, School of Psychological Sciences, Monash University, Clayton, Victoria, Australia
| | - Chris Edgar
- Cogstate Ltd, Melbourne, Victoria, Australia
| | - Paul Maruff
- Cogstate Ltd, Melbourne, Victoria, Australia
- Turner Institute for Brain and Mental Health, School of Psychological Sciences, Monash University, Clayton, Victoria, Australia
- Florey Institute of Neuroscience and Mental Health, The University of Melbourne, Melbourne, Victoria, Australia
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12
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Studentova V, Sudova V, Bitar I, Paskova V, Moravec J, Pompach P, Volny M, Novak P, Hrabak J. Preferred β-lactone synthesis can explain high rate of false-negative results in the detection of OXA-48-like carbapenemases. Sci Rep 2022; 12:22235. [PMID: 36564543 PMCID: PMC9789108 DOI: 10.1038/s41598-022-26735-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2022] [Accepted: 12/19/2022] [Indexed: 12/24/2022] Open
Abstract
The resistance to carbapenems is usually mediated by enzymes hydrolyzing β-lactam ring. Recently, an alternative way of the modification of the antibiotic, a β-lactone formation by OXA-48-like enzymes, in some carbapenems was identified. We focused our study on a deep analysis of OXA-48-like-producing Enterobacterales, especially strains showing poor hydrolytic activity. In this study, well characterized 74 isolates of Enterobacterales resistant to carbapenems were used. Carbapenemase activity was determined by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS), liquid chromatography/mass spectrometry (LC-MS), Carba-NP test and modified Carbapenem Inactivation Method (mCIM). As meropenem-derived β-lactone possesses the same molecular weight as native meropenem (MW 383.46 g/mol), β-lactonization cannot be directly detected by MALDI-TOF MS. In the spectra, however, the peaks of m/z = 340.5 and 362.5 representing decarboxylated β-lactone and its sodium adduct were detected in 25 out of 35 OXA-48-like producers. In the rest 10 isolates, decarboxylated hydrolytic product (m/z = 358.5) and its sodium adduct (m/z = 380.5) have been detected. The peak of m/z = 362.5 was detected in 3 strains co-producing OXA-48-like and NDM-1 carbapenemases. The respective signal was identified in no strain producing class A or class B carbapenemase alone showing its specificity for OXA-48-like carbapenemases. Using LC-MS, we were able to identify meropenem-derived β-lactone directly according to the different retention time. All strains with a predominant β-lactone production showed negative results of Carba NP test. In this study, we have demonstrated that the strains producing OXA-48-like carbapenemases showing false-negative results using Carba NP test and MALDI-TOF MS preferentially produced meropenem-derived β-lactone. We also identified β-lactone-specific peak in MALDI-TOF MS spectra and demonstrated the ability of LC-MS to detect meropenem-derived β-lactone.
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Affiliation(s)
- Vendula Studentova
- grid.4491.80000 0004 1937 116XBiomedical Center, Faculty of Medicine in Pilsen, Charles University, Alej Svobody 76, 323 00 Pilsen, Czech Republic ,grid.4491.80000 0004 1937 116XDepartment of Microbiology, Faculty of Medicine in Pilsen, Charles University, Alej Svobody 80, 323 00 Pilsen, Czech Republic
| | - Vendula Sudova
- grid.4491.80000 0004 1937 116XBiomedical Center, Faculty of Medicine in Pilsen, Charles University, Alej Svobody 76, 323 00 Pilsen, Czech Republic ,grid.4491.80000 0004 1937 116XDepartment of Clinical Biochemistry and Haematology, Faculty of Medicine in Pilsen, Charles University, Alej Svobody 80, 323 00 Pilsen, Czech Republic
| | - Ibrahim Bitar
- grid.4491.80000 0004 1937 116XBiomedical Center, Faculty of Medicine in Pilsen, Charles University, Alej Svobody 76, 323 00 Pilsen, Czech Republic ,grid.4491.80000 0004 1937 116XDepartment of Microbiology, Faculty of Medicine in Pilsen, Charles University, Alej Svobody 80, 323 00 Pilsen, Czech Republic
| | - Veronika Paskova
- grid.4491.80000 0004 1937 116XBiomedical Center, Faculty of Medicine in Pilsen, Charles University, Alej Svobody 76, 323 00 Pilsen, Czech Republic ,grid.4491.80000 0004 1937 116XDepartment of Microbiology, Faculty of Medicine in Pilsen, Charles University, Alej Svobody 80, 323 00 Pilsen, Czech Republic
| | - Jiri Moravec
- grid.4491.80000 0004 1937 116XBiomedical Center, Faculty of Medicine in Pilsen, Charles University, Alej Svobody 76, 323 00 Pilsen, Czech Republic
| | - Petr Pompach
- grid.418800.50000 0004 0555 4846Institute of Microbiology of the Czech Academy of Sciences, BIOCEV, Prumyslova 595, 252 50 Vestec, Czech Republic
| | - Michael Volny
- grid.418800.50000 0004 0555 4846Institute of Microbiology of the Czech Academy of Sciences, BIOCEV, Prumyslova 595, 252 50 Vestec, Czech Republic
| | - Petr Novak
- grid.418800.50000 0004 0555 4846Institute of Microbiology of the Czech Academy of Sciences, BIOCEV, Prumyslova 595, 252 50 Vestec, Czech Republic
| | - Jaroslav Hrabak
- grid.4491.80000 0004 1937 116XBiomedical Center, Faculty of Medicine in Pilsen, Charles University, Alej Svobody 76, 323 00 Pilsen, Czech Republic ,grid.4491.80000 0004 1937 116XDepartment of Microbiology, Faculty of Medicine in Pilsen, Charles University, Alej Svobody 80, 323 00 Pilsen, Czech Republic
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13
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van Cruchten RTP, van As D, Glennon JC, van Engelen BGM, 't Hoen PAC, Wenninger S, Daidj F, Cumming S, Littleford R, Monckton DG, Lochmüller H, Catt M, Faber CG, Hapca A, Donnan PT, Gorman G, Bassez G, Schoser B, Knoop H, Treweek S, Wansink DG, Impens F, Gabriels R, Claeys T, Ravel-Chapuis A, Jasmin BJ, Mahon N, Nieuwenhuis S, Martens L, Novak P, Furling D, Baak A, Gourdon G, MacKenzie A, Martinat C, Neault N, Roos A, Duchesne E, Salz R, Thompson R, Baghdoyan S, Varghese AM, Blom P, Spendiff S, Manta A. Clinical improvement of DM1 patients reflected by reversal of disease-induced gene expression in blood. BMC Med 2022; 20:395. [PMID: 36352383 PMCID: PMC9646470 DOI: 10.1186/s12916-022-02591-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Accepted: 09/30/2022] [Indexed: 11/11/2022] Open
Abstract
BACKGROUND Myotonic dystrophy type 1 (DM1) is an incurable multisystem disease caused by a CTG-repeat expansion in the DM1 protein kinase (DMPK) gene. The OPTIMISTIC clinical trial demonstrated positive and heterogenous effects of cognitive behavioral therapy (CBT) on the capacity for activity and social participations in DM1 patients. Through a process of reverse engineering, this study aims to identify druggable molecular biomarkers associated with the clinical improvement in the OPTIMISTIC cohort. METHODS Based on full blood samples collected during OPTIMISTIC, we performed paired mRNA sequencing for 27 patients before and after the CBT intervention. Linear mixed effect models were used to identify biomarkers associated with the disease-causing CTG expansion and the mean clinical improvement across all clinical outcome measures. RESULTS We identified 608 genes for which their expression was significantly associated with the CTG-repeat expansion, as well as 1176 genes significantly associated with the average clinical response towards the intervention. Remarkably, all 97 genes associated with both returned to more normal levels in patients who benefited the most from CBT. This main finding has been replicated based on an external dataset of mRNA data of DM1 patients and controls, singling these genes out as candidate biomarkers for therapy response. Among these candidate genes were DNAJB12, HDAC5, and TRIM8, each belonging to a protein family that is being studied in the context of neurological disorders or muscular dystrophies. Across the different gene sets, gene pathway enrichment analysis revealed disease-relevant impaired signaling in, among others, insulin-, metabolism-, and immune-related pathways. Furthermore, evidence for shared dysregulations with another neuromuscular disease, Duchenne muscular dystrophy, was found, suggesting a partial overlap in blood-based gene dysregulation. CONCLUSIONS DM1-relevant disease signatures can be identified on a molecular level in peripheral blood, opening new avenues for drug discovery and therapy efficacy assessments.
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Affiliation(s)
- Remco T P van Cruchten
- Center for Molecular and Biomolecular Informatics, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Daniël van As
- Center for Molecular and Biomolecular Informatics, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Nijmegen, The Netherlands.,Department of Neurology, Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Jeffrey C Glennon
- Conway Institute of Biomolecular and Biomedical Research, School of Medicine, University College Dublin, Dublin, Ireland
| | - Baziel G M van Engelen
- Department of Neurology, Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Peter A C 't Hoen
- Center for Molecular and Biomolecular Informatics, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Nijmegen, The Netherlands.
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14
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Sri-Ranjan K, Sanchez-Alonso JL, Swiatlowska P, Rothery S, Novak P, Gerlach S, Koeninger D, Hoffmann B, Merkel R, Stevens MM, Sun SX, Gorelik J, Braga VMM. Intrinsic cell rheology drives junction maturation. Nat Commun 2022; 13:4832. [PMID: 35977954 PMCID: PMC9385638 DOI: 10.1038/s41467-022-32102-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2021] [Accepted: 07/15/2022] [Indexed: 12/02/2022] Open
Abstract
A fundamental property of higher eukaryotes that underpins their evolutionary success is stable cell-cell cohesion. Yet, how intrinsic cell rheology and stiffness contributes to junction stabilization and maturation is poorly understood. We demonstrate that localized modulation of cell rheology governs the transition of a slack, undulated cell-cell contact (weak adhesion) to a mature, straight junction (optimal adhesion). Cell pairs confined on different geometries have heterogeneous elasticity maps and control their own intrinsic rheology co-ordinately. More compliant cell pairs grown on circles have slack contacts, while stiffer triangular cell pairs favour straight junctions with flanking contractile thin bundles. Counter-intuitively, straighter cell-cell contacts have reduced receptor density and less dynamic junctional actin, suggesting an unusual adaptive mechano-response to stabilize cell-cell adhesion. Our modelling informs that slack junctions arise from failure of circular cell pairs to increase their own intrinsic stiffness and resist the pressures from the neighbouring cell. The inability to form a straight junction can be reversed by increasing mechanical stress artificially on stiffer substrates. Our data inform on the minimal intrinsic rheology to generate a mature junction and provide a springboard towards understanding elements governing tissue-level mechanics.
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Affiliation(s)
- K Sri-Ranjan
- National Heart and Lung Institute, Faculty of Medicine, Imperial College London, London, UK
| | - J L Sanchez-Alonso
- National Heart and Lung Institute, Faculty of Medicine, Imperial College London, London, UK
| | - P Swiatlowska
- National Heart and Lung Institute, Faculty of Medicine, Imperial College London, London, UK
| | - S Rothery
- National Heart and Lung Institute, Faculty of Medicine, Imperial College London, London, UK
| | - P Novak
- School of Engineering and Materials Science, Queen Mary University, London, UK
| | - S Gerlach
- Institute of Biological Information Processing, IBI-2: Mechanobiology, Julich, Germany
| | - D Koeninger
- Institute of Biological Information Processing, IBI-2: Mechanobiology, Julich, Germany
| | - B Hoffmann
- Institute of Biological Information Processing, IBI-2: Mechanobiology, Julich, Germany
| | - R Merkel
- Institute of Biological Information Processing, IBI-2: Mechanobiology, Julich, Germany
| | - M M Stevens
- Department of Materials, Department of Bioengineering and Institute of Biomedical Engineering Imperial College London, London, UK
| | - S X Sun
- Department of Mechanical Engineering and Institute of NanoBioTechnology, Johns Hopkins University, Baltimore Maryland, USA
| | - J Gorelik
- National Heart and Lung Institute, Faculty of Medicine, Imperial College London, London, UK.
| | - Vania M M Braga
- National Heart and Lung Institute, Faculty of Medicine, Imperial College London, London, UK.
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15
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Hofstatter PG, Thangavel G, Lux T, Neumann P, Vondrak T, Novak P, Zhang M, Costa L, Castellani M, Scott A, Toegelová H, Fuchs J, Mata-Sucre Y, Dias Y, Vanzela AL, Huettel B, Almeida CC, Šimková H, Souza G, Pedrosa-Harand A, Macas J, Mayer KF, Houben A, Marques A. Repeat-based holocentromeres influence genome architecture and karyotype evolution. Cell 2022; 185:3153-3168.e18. [DOI: 10.1016/j.cell.2022.06.045] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2022] [Revised: 05/24/2022] [Accepted: 06/24/2022] [Indexed: 01/30/2023]
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16
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Mate V, Smolek T, Kazmerova ZV, Jadhav S, Brezovakova V, Jurkanin B, Uhrinova I, Basheer N, Zilka N, Katina S, Novak P. Enriched environment ameliorates propagation of tau pathology and improves cognition in rat model of tauopathy. Front Aging Neurosci 2022; 14:935973. [PMID: 35966785 PMCID: PMC9363241 DOI: 10.3389/fnagi.2022.935973] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2022] [Accepted: 07/06/2022] [Indexed: 11/13/2022] Open
Abstract
Introduction The typical symptoms of Alzheimer’s disease (AD) are cognitive impairment, disrupted spatial orientation, behavioral and psychiatric abnormalities, and later motor deficits. Neuropathologically, AD is characterized by deposits of pathological forms of endogenous proteins – amyloid-β, and neurofibrillary tau protein pathology. The latter closely correlates with brain atrophy and clinical impairment. Pharmacological therapies for these pathologies are largely absent, raising the question whether non-pharmacological interventions could be efficacious. Environmental factors can play a role in the manifestation of AD. It is unknown whether enriched environment (EE) can ameliorate the propagation of protein aggregates or their toxic components. Methods We injected insoluble tau extracts from human brains with AD (600 or 900 ng per animal) into hippocampi of SHR72 transgenic rats that express non-mutated truncated human tau 151-391/4R, but usually do not develop hippocampal tangles. The rats had either standard housing, or could access an EE 5×/week for 3 months. Behavioral analysis included the Morris Water Maze (MWM). Histological analysis was used to assess the propagation of tau pathology. Results Animals exposed to EE performed better in the MWM (spatial acquisition duration and total distance, probe test); unexposed animals improved over the course of acquisition trials, but their mean performance remained below that of the EE group. Enriched environment abrogated tau propagation and hippocampal tangle formation in the 600 ng group; in the 900 ng group, tangle formation was ∼10-fold of the 600 ng group, and unaffected by EE. Conclusion Even a small difference in the amount of injected human AD tau can cause a pronounced difference in the number of resulting tangles. EE leads to a noticeably better spatial navigation performance of tau-injected animals. Furthermore, EE seems to be able to slow down tau pathology progression, indicating the possible utility of similar interventions in early stages of AD where tangle loads are still low.
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Affiliation(s)
- Veronika Mate
- Institute of Neuroimmunology, Slovak Academy of Sciences, Bratislava, Slovakia
- Axon Neuroscience R&D Services SE, Bratislava, Slovakia
| | - Tomas Smolek
- Institute of Neuroimmunology, Slovak Academy of Sciences, Bratislava, Slovakia
- Axon Neuroscience R&D Services SE, Bratislava, Slovakia
- Neuroimunology Institute, n.p.o., Bratislava, Slovakia
| | - Zuzana Vince Kazmerova
- Institute of Neuroimmunology, Slovak Academy of Sciences, Bratislava, Slovakia
- Axon Neuroscience R&D Services SE, Bratislava, Slovakia
| | - Santosh Jadhav
- Institute of Neuroimmunology, Slovak Academy of Sciences, Bratislava, Slovakia
- Axon Neuroscience R&D Services SE, Bratislava, Slovakia
| | | | | | - Ivana Uhrinova
- Institute of Neuroimmunology, Slovak Academy of Sciences, Bratislava, Slovakia
- Axon Neuroscience R&D Services SE, Bratislava, Slovakia
| | - Neha Basheer
- Institute of Neuroimmunology, Slovak Academy of Sciences, Bratislava, Slovakia
| | - Norbert Zilka
- Institute of Neuroimmunology, Slovak Academy of Sciences, Bratislava, Slovakia
- Axon Neuroscience R&D Services SE, Bratislava, Slovakia
| | - Stanislav Katina
- Institute of Neuroimmunology, Slovak Academy of Sciences, Bratislava, Slovakia
- Institute of Mathematics and Statistics, Masaryk University, Brno, Czechia
- Axon Neuroscience CRM Services SE, Bratislava, Slovakia
| | - Petr Novak
- Institute of Neuroimmunology, Slovak Academy of Sciences, Bratislava, Slovakia
- Axon Neuroscience CRM Services SE, Bratislava, Slovakia
- *Correspondence: Petr Novak,
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17
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Aponte Becerra L, Galindo Mendez B, Khan F, Lioutas V, Novak P, Mantzoros CS, Ngo LH, Novak V. Safety of Intranasal Insulin in Type 2 Diabetes on Systemic Insulin: A Double-Blinded Placebo-Controlled Sub-Study of Memaid Trial. Arch Diabetes Obes 2022; 4:403-415. [PMID: 35903156 PMCID: PMC9328174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
AIMS To determine safety of intranasal insulin (INI) in MemAID trial participants with diabetes treated with systemic insulins. MATERIALS AND METHODS This randomized, double-blinded trial consisted of 24-week INI or placebo treatment once daily and 24-week follow-up. Safety outcomes were: 1) Short-term effects on glycemic variability, hypoglycemic episodes on continuous glucose monitoring (CGM) at baseline and on-treatment. 2) Long-term effects on glucose metabolism and weight on INI/placebo treatment and post-treatment follow-up. Of 86 screened subjects, 14 were randomized, 9 (5 INI, 4 Placebo) completed CGM at baseline and on-treatment, and 5 (2 INI, 3 Placebo) completed treatment and follow-up. RESULTS INI was safe and was not associated with serious adverse events, hypoglycemic episodes or weight gain. INI administration did not acutely affect capillary glucose. Glycemic variability on CGM decreased with INI, compared to baseline. On INI treatment, there was a long-term trend toward lower HbA1c, plasma glucose and insulin. No interactions with subcutaneous insulins were observed. CONCLUSIONS INI is safe in older people with diabetes treated with systemic insulins, and it is not associated with adverse events, hypoglycemia or weight gain. Future studies are needed to determine whether INI administration can reduce glycemic variability, improve insulin sensitivity and thus potentially lessen diabetes burden in this population.
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Affiliation(s)
- L Aponte Becerra
- Department of Neurology, SAFE Laboratory, Beth Israel Deaconess Medical Center, Harvard Medical School, USA
- Department of Internal Medicine, Jackson Memorial Hospital, University of Miami, Miami, FL, USA
| | - B Galindo Mendez
- Department of Neurology, SAFE Laboratory, Beth Israel Deaconess Medical Center, Harvard Medical School, USA
| | - F Khan
- Department of Neurology, SAFE Laboratory, Beth Israel Deaconess Medical Center, Harvard Medical School, USA
| | - V Lioutas
- Department of Neurology, SAFE Laboratory, Beth Israel Deaconess Medical Center, Harvard Medical School, USA
| | - P Novak
- Department of Neurology, Brigham and Women's Faulkner Hospital, Harvard Medical School, Boston, MA, USA
| | - C S Mantzoros
- Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston MA and Department of Medicine, Boston VA Healthcare System, Harvard Medical School, Boston, MA, USA
| | - L H Ngo
- Department of Medicine, Beth Israel Deaconess Medical Center and School of Public Health, Harvard Medical School, Boston, MA, USA
| | - V Novak
- Department of Neurology, SAFE Laboratory, Beth Israel Deaconess Medical Center, Harvard Medical School, USA
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18
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Novak P, Lohse-Busch H. P 31 Long-term results with TPS (Transcranial Pulse Stimulation) treatment of Alzheimer's disease. Clin Neurophysiol 2022. [DOI: 10.1016/j.clinph.2022.01.062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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19
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Loginov DS, Fiala J, Brechlin P, Kruppa G, Novak P. Hydroxyl radical footprinting analysis of a human haptoglobin-hemoglobin complex. Biochim Biophys Acta Proteins Proteom 2022; 1870:140735. [PMID: 34742912 DOI: 10.1016/j.bbapap.2021.140735] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2021] [Revised: 09/22/2021] [Accepted: 10/26/2021] [Indexed: 10/19/2022]
Abstract
Methods of structural mass spectrometry have become more popular to study protein structure and dynamics. Among them, fast photochemical oxidation of proteins (FPOP) has several advantages such as irreversibility of modifications and more facile determination of the site of modification with single residue resolution. In the present study, FPOP analysis was applied to study the hemoglobin (Hb) - haptoglobin (Hp) complex allowing identification of respective regions altered upon the complex formation. FPOP footprinting using a timsTOF Pro mass spectrometer revealed structural information for 84 and 76 residues in Hp and Hb, respectively, including statistically significant differences in the modification extent below 0.3%. The most affected residues upon complex formation were Met76 and Tyr140 in Hbα, and Tyr280 and Trp284 in Hpβ. The data allowed determination of amino acids directly involved in Hb - Hp interactions and those located outside of the interaction interface yet affected by the complex formation. Also, previously modeled interaction between Hb βTrp37 and Hp βPhe292 was not confirmed by our data. Data are available via ProteomeXchange with identifier PXD021621.
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Affiliation(s)
- Dmitry S Loginov
- BioCeV - Institute of Microbiology of the CAS, Prumyslova 595, CZ-252 50 Vestec, Czech Republic; Orekhovich Institute of Biomedical Chemistry, Pogodinskaja str. 10, 119191 Moscow, Russia.
| | - Jan Fiala
- BioCeV - Institute of Microbiology of the CAS, Prumyslova 595, CZ-252 50 Vestec, Czech Republic; Faculty of Science, Charles University, Hlavova 8, CZ-128 20 Prague, Czech Republic
| | - Peter Brechlin
- Bruker Daltonik GmbH, Fahrenheitstraße 4, 28359 Bremen, Germany
| | - Gary Kruppa
- Bruker s.r.o., Prazakova 60, 619 00, Brno, Czech Republic
| | - Petr Novak
- BioCeV - Institute of Microbiology of the CAS, Prumyslova 595, CZ-252 50 Vestec, Czech Republic.
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20
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Adu K, Plata L, Ratilla M, Novak P, Zlamal L. Extending the UTAUT model to understand the barriers towards SME digitalization. Serb J Management 2022. [DOI: 10.5937/sjm17-37629] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Digitalization has been identified as a core growth driver for small and medium enterprises (SMEs) in this digital era. This study investigates the drivers and barriers aligned with the tendency of owner-managers of SMEs to adopt digitalization. A conceptual framework is developed that extends the unified theory of acceptance and technology (UTAUT) with an anxiety-digitalized environment as a moderating factor of SME owner-managers' intention to adopt digitalization. A quantitative methodology is used to gauge responses from 89 respondents (owner-managers). Additionally, the variance-based structural equation modelling approach (PLS-SEM) is used to analyse and validate the proposed model. Results show that attitude positively mediates the relationship between performance expectancy and intention to adopt digitalization. However, effort expectancy and facilitating conditions were found to negatively influence attitude and intention to adopt digitalization. On the contrary, the results obtained did not confirm the significance of an anxiety-digitalized environment in moderation analyses. Consequently, the overall structural model accounted for 51.1% of the variance in the intention to adopt digitalization among SMEs. This study has theoretically and practically contributed to understanding owner-managers' intent to adopt digitalization of SMEs in the Czech Republic.
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21
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Novak P, Zilka N. The manifold works of Prof. Michal Novak. Gen Physiol Biophys 2021; 40:439-442. [PMID: 34897019 DOI: 10.4149/gpb_2021045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Petr Novak
- Institute of Neuroimmunology, Slovak Academy of Sciences, Bratislava, Slovakia
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22
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Vermeire PJ, Stalmans G, Lilina AV, Fiala J, Novak P, Herrmann H, Strelkov SV. Molecular Interactions Driving Intermediate Filament Assembly. Cells 2021; 10:cells10092457. [PMID: 34572105 PMCID: PMC8466517 DOI: 10.3390/cells10092457] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2021] [Revised: 08/31/2021] [Accepted: 09/03/2021] [Indexed: 02/06/2023] Open
Abstract
Given the role of intermediate filaments (IFs) in normal cell physiology and scores of IF-linked diseases, the importance of understanding their molecular structure is beyond doubt. Research into the IF structure was initiated more than 30 years ago, and some important advances have been made. Using crystallography and other methods, the central coiled-coil domain of the elementary dimer and also the structural basis of the soluble tetramer formation have been studied to atomic precision. However, the molecular interactions driving later stages of the filament assembly are still not fully understood. For cytoplasmic IFs, much of the currently available insight is due to chemical cross-linking experiments that date back to the 1990s. This technique has since been radically improved, and several groups have utilized it recently to obtain data on lamin filament assembly. Here, we will summarize these findings and reflect on the remaining open questions and challenges of IF structure. We argue that, in addition to X-ray crystallography, chemical cross-linking and cryoelectron microscopy are the techniques that should enable major new advances in the field in the near future.
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Affiliation(s)
- Pieter-Jan Vermeire
- Laboratory for Biocrystallography, KU Leuven, 3000 Leuven, Belgium; (P.-J.V.); (G.S.); (A.V.L.)
| | - Giel Stalmans
- Laboratory for Biocrystallography, KU Leuven, 3000 Leuven, Belgium; (P.-J.V.); (G.S.); (A.V.L.)
| | - Anastasia V. Lilina
- Laboratory for Biocrystallography, KU Leuven, 3000 Leuven, Belgium; (P.-J.V.); (G.S.); (A.V.L.)
| | - Jan Fiala
- Department of Biochemistry, Charles University, 12800 Prague, Czech Republic; (J.F.); (P.N.)
- Institute of Microbiology of the Czech Academy of Sciences, 14220 Prague, Czech Republic
| | - Petr Novak
- Department of Biochemistry, Charles University, 12800 Prague, Czech Republic; (J.F.); (P.N.)
- Institute of Microbiology of the Czech Academy of Sciences, 14220 Prague, Czech Republic
| | - Harald Herrmann
- Institute of Neuropathology, University Hospital Erlangen, Friedrich-Alexander University Erlangen-Nürnberg, 91054 Erlangen, Germany;
| | - Sergei V. Strelkov
- Laboratory for Biocrystallography, KU Leuven, 3000 Leuven, Belgium; (P.-J.V.); (G.S.); (A.V.L.)
- Correspondence: ; Tel.: +32-1633-0845
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23
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Mank A, van Maurik IS, Bakker ED, van de Glind EMM, Jönsson L, Kramberger MG, Novak P, Diaz A, Gove D, Scheltens P, van der Flier WM, Visser LNC. Identifying relevant outcomes in the progression of Alzheimer's disease; what do patients and care partners want to know about prognosis? Alzheimers Dement (N Y) 2021; 7:e12189. [PMID: 34458555 PMCID: PMC8377775 DOI: 10.1002/trc2.12189] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/21/2021] [Revised: 04/19/2021] [Accepted: 05/06/2021] [Indexed: 11/23/2022]
Abstract
BACKGROUND Prognostic studies in the context of Alzheimer's disease (AD) mainly predicted time to dementia. However, it is questionable whether onset of dementia is the most relevant outcome along the AD disease trajectory from the perspective of patients and their care partners. Therefore, we aimed to identify the most relevant outcomes from the viewpoint of patients and care partners. METHODS We used a two-step, mixed-methods approach. As a first step we conducted four focus groups in the Netherlands to elicit a comprehensive list of outcomes considered important by patients (n = 12) and care partners (n = 14) in the prognosis of AD. The focus groups resulted in a list of 59 items, divided into five categories. Next, in an online European survey, we asked participants (n = 232; 99 patients, 133 care partners) to rate the importance of all 59 items (5-point Likert scale). As participants were likely to rate a large number of outcomes as "important" (4) or "very important" (5), we subsequently asked them to select the three items they considered most important. RESULTS The top-10 lists of items most frequently mentioned as "most important" by patients and care partners were merged into one core outcome list, comprising 13 items. Both patients and care partners selected outcomes from the category "cognition" most often, followed by items in the categories "functioning and dependency" and "physical health." No items from the category "behavior and neuropsychiatry" and "social environment" ended up in our core list of relevant outcomes. CONCLUSION We identified a core list of outcomes relevant to patients and care partner, and found that prognostic information related to cognitive decline, dependency, and physical health are considered most relevant by both patients and their care partners.
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Affiliation(s)
- Arenda Mank
- Alzheimer Center AmsterdamDepartment of NeurologyVU University Medical CenterAmsterdam UMCAmsterdamthe Netherlands
| | - Ingrid S. van Maurik
- Alzheimer Center AmsterdamDepartment of NeurologyVU University Medical CenterAmsterdam UMCAmsterdamthe Netherlands
- Department of Epidemiology and Data ScienceAmsterdam UMC, Vrije Universiteit AmsterdamAmsterdamthe Netherlands
| | - Els D. Bakker
- Alzheimer Center AmsterdamDepartment of NeurologyVU University Medical CenterAmsterdam UMCAmsterdamthe Netherlands
| | | | | | - Milica G. Kramberger
- Center for Cognitive ImpairmentsUniversity Medical Centre LjubljanaLjubljanaSlovenia
| | - Petr Novak
- Institute of NeuroimmunologySlovak Academy of SciencesBratislavaSlovakia
| | - Ana Diaz
- Alzheimer Europe (AE)Luxembourg CityLuxembourg
| | - Dianne Gove
- Alzheimer Europe (AE)Luxembourg CityLuxembourg
| | - Philip Scheltens
- Alzheimer Center AmsterdamDepartment of NeurologyVU University Medical CenterAmsterdam UMCAmsterdamthe Netherlands
| | - Wiesje M. van der Flier
- Alzheimer Center AmsterdamDepartment of NeurologyVU University Medical CenterAmsterdam UMCAmsterdamthe Netherlands
| | - Leonie N. C. Visser
- Alzheimer Center AmsterdamDepartment of NeurologyVU University Medical CenterAmsterdam UMCAmsterdamthe Netherlands
- Department of Medical PsychologyAmsterdam Public Health Research InstituteAmsterdam UMCAmsterdamthe Netherlands
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24
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Loginov DS, Fiala J, Chmelik J, Brechlin P, Kruppa G, Novak P. Correction to "Benefits of Ion Mobility Separation and Parallel Accumulation-Serial Fragmentation Technology on timsTOF Pro for the Needs of Fast Photochemical Oxidation of Protein Analysis". ACS Omega 2021; 6:14726. [PMID: 34124494 PMCID: PMC8190877 DOI: 10.1021/acsomega.1c02648] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 05/20/2021] [Indexed: 06/12/2023]
Abstract
[This corrects the article DOI: 10.1021/acsomega.1c00732.].
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Affiliation(s)
- Dmitry S Loginov
- Institute of Microbiology, The Czech Academy of Sciences, Videnska 1083, 14220 Prague, Czech Republic
- Orekhovich Institute of Biomedical Chemistry, Pogodinskaja str. 10, 119191 Moscow, Russia
| | - Jan Fiala
- Faculty of Science, Charles University, Hlavova 8, 128 20 Prague, Czech Republic
| | - Josef Chmelik
- Institute of Microbiology, The Czech Academy of Sciences, Videnska 1083, 14220 Prague, Czech Republic
| | - Peter Brechlin
- Bruker Daltonik GmbH, Fahrenheitstraße 4, 28359 Bremen, Germany
| | - Gary Kruppa
- Bruker s.r.o., Prazakova 60, 619 00 Brno, Czech Republic
| | - Petr Novak
- Institute of Microbiology, The Czech Academy of Sciences, Videnska 1083, 14220 Prague, Czech Republic
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25
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Novak P, Kovacech B, Katina S, Schmidt R, Scheltens P, Kontsekova E, Ropele S, Fialova L, Kramberger M, Paulenka-Ivanovova N, Smisek M, Hanes J, Stevens E, Kovac A, Sutovsky S, Parrak V, Koson P, Prcina M, Galba J, Cente M, Hromadka T, Filipcik P, Piestansky J, Samcova M, Prenn-Gologranc C, Sivak R, Froelich L, Fresser M, Rakusa M, Harrison J, Hort J, Otto M, Tosun D, Ondrus M, Winblad B, Novak M, Zilka N. ADAMANT: a placebo-controlled randomized phase 2 study of AADvac1, an active immunotherapy against pathological tau in Alzheimer's disease. Nat Aging 2021; 1:521-534. [PMID: 37117834 DOI: 10.1038/s43587-021-00070-2] [Citation(s) in RCA: 56] [Impact Index Per Article: 18.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2020] [Accepted: 04/28/2021] [Indexed: 04/30/2023]
Abstract
Alzheimer's disease (AD) pathology is partly characterized by accumulation of aberrant forms of tau protein. Here we report the results of ADAMANT, a 24-month double-blinded, parallel-arm, randomized phase 2 multicenter placebo-controlled trial of AADvac1, an active peptide vaccine designed to target pathological tau in AD (EudraCT 2015-000630-30). Eleven doses of AADvac1 were administered to patients with mild AD dementia at 40 μg per dose over the course of the trial. The primary objective was to evaluate the safety and tolerability of long-term AADvac1 treatment. The secondary objectives were to evaluate immunogenicity and efficacy of AADvac1 treatment in slowing cognitive and functional decline. A total of 196 patients were randomized 3:2 between AADvac1 and placebo. AADvac1 was safe and well tolerated (AADvac1 n = 117, placebo n = 79; serious adverse events observed in 17.1% of AADvac1-treated individuals and 24.1% of placebo-treated individuals; adverse events observed in 84.6% of AADvac1-treated individuals and 81.0% of placebo-treated individuals). The vaccine induced high levels of IgG antibodies. No significant effects were found in cognitive and functional tests on the whole study sample (Clinical Dementia Rating-Sum of the Boxes scale adjusted mean point difference -0.360 (95% CI -1.306, 0.589)), custom cognitive battery adjusted mean z-score difference of 0.0008 (95% CI -0.169, 0.172). We also present results from exploratory and post hoc analyses looking at relevant biomarkers and clinical outcomes in specific subgroups. Our results show that AADvac1 is safe and immunogenic, but larger stratified studies are needed to better evaluate its potential clinical efficacy and impact on disease biomarkers.
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Affiliation(s)
- Petr Novak
- AXON Neuroscience CRM Services SE, Bratislava, Slovakia.
| | | | | | - Reinhold Schmidt
- Clinical Division of Neurogeriatrics, Department of Neurology, Medical University Graz, Graz, Austria
| | - Philip Scheltens
- Alzheimer Center, Amsterdam University Medical Centers, Amsterdam, the Netherlands
| | | | - Stefan Ropele
- Clinical Division of General Neurology, Department of Neurology, Medical University Graz, Graz, Austria
| | | | - Milica Kramberger
- Department of Neurology, University Medical Centre Ljubljana, Ljubljana, Slovenia
| | | | | | - Jozef Hanes
- AXON Neuroscience R&D Services SE, Bratislava, Slovakia
| | - Eva Stevens
- AXON Neuroscience R&D Services SE, Bratislava, Slovakia
| | - Andrej Kovac
- AXON Neuroscience R&D Services SE, Bratislava, Slovakia
| | - Stanislav Sutovsky
- 1st Department of Neurology, Faculty of Medicine, Comenius University and University Hospital, Bratislava, Slovakia
| | | | - Peter Koson
- AXON Neuroscience CRM Services SE, Bratislava, Slovakia
| | - Michal Prcina
- AXON Neuroscience R&D Services SE, Bratislava, Slovakia
| | | | - Martin Cente
- AXON Neuroscience R&D Services SE, Bratislava, Slovakia
| | - Tomas Hromadka
- Institute of Neuroimmunology, Slovak Academy of Sciences, Bratislava, Slovakia
| | | | | | - Maria Samcova
- AXON Neuroscience CRM Services SE, Bratislava, Slovakia
| | | | - Roman Sivak
- AXON Neuroscience CRM Services SE, Bratislava, Slovakia
| | - Lutz Froelich
- Department of Geriatric Psychiatry, Zentralinstitut für Seelische Gesundheit, Medical Faculty Mannheim University of Heidelberg, Heidelberg, Germany
| | | | - Martin Rakusa
- Department of Neurological Diseases, University Medical Centre Maribor, Maribor, Slovenia
| | - John Harrison
- Alzheimer Center, Amsterdam University Medical Centers, Amsterdam, the Netherlands
| | - Jakub Hort
- Memory Clinic, Department of Neurology, Charles University, 2nd Faculty of Medicine and Motol University Hospital, Prague, Czech Republic
| | - Markus Otto
- Department of Neurology, Ulm University Hospital, Ulm, Germany
| | - Duygu Tosun
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, CA, USA
| | - Matej Ondrus
- AXON Neuroscience CRM Services SE, Bratislava, Slovakia
| | - Bengt Winblad
- Division of Neurogeriatrics, Center for Alzheimer Research, Karolinska Institutet, Solna, Sweden
- Theme Inflammation and Aging, Karolinska University Hospital, Huddinge, Sweden
| | | | - Norbert Zilka
- AXON Neuroscience R&D Services SE, Bratislava, Slovakia
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26
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Kaszuba-Zwoińska J, Novak P, Nowak B, Furgała A, Wójcik-Piotrowicz K, Piszczek P, Guzdek P, Pytko-Polończyk J. Low-frequency electromagnetic field influences human oral mucosa keratinocyte viability in response to lipopolysaccharide or minocycline treatment in cell culture conditions. Biomed Pharmacother 2021; 137:111340. [DOI: 10.1016/j.biopha.2021.111340] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2020] [Revised: 01/26/2021] [Accepted: 01/27/2021] [Indexed: 01/09/2023] Open
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27
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Loginov DS, Fiala J, Chmelik J, Brechlin P, Kruppa G, Novak P. Benefits of Ion Mobility Separation and Parallel Accumulation-Serial Fragmentation Technology on timsTOF Pro for the Needs of Fast Photochemical Oxidation of Protein Analysis. ACS Omega 2021; 6:10352-10361. [PMID: 34056188 PMCID: PMC8153767 DOI: 10.1021/acsomega.1c00732] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2021] [Accepted: 03/29/2021] [Indexed: 05/07/2023]
Abstract
Fast photochemical oxidation of proteins (FPOP) is a recently developed technique for studying protein folding, conformations, interactions, etc. In this method, hydroxyl radicals, usually generated by KrF laser photolysis of H2O2, are used for irreversible labeling of solvent-exposed side chains of amino acids. Mapping of the oxidized residues to the protein's structure requires pinpointing of modifications using a bottom-up proteomic approach. In this work, a quadrupole time-of-flight (QTOF) mass spectrometer coupled with trapped ion mobility spectrometry (timsTOF Pro) was used for identification of oxidative modifications in a model protein. Multiple modifications on the same residues, including six modifications of histidine, were successfully resolved. Moreover, parallel accumulation-serial fragmentation (PASEF) technology allows successful sequencing of even minor populations of modified peptides. The data obtained indicate a clear improvement of the quality of the FPOP analysis from the viewpoint of the number of identified peptides bearing oxidative modifications and their precise localization. Data are available via ProteomeXchange with identifier PXD020509.
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Affiliation(s)
- Dmitry S. Loginov
- Institute
of Microbiology, The Czech Academy of Sciences, Videnska 1083, 14220 Prague, Czech Republic
- Faculty
of Science, Charles University, Hlavova 8, 128 20 Prague, Czech Republic
| | - Jan Fiala
- Orekhovich
Institute of Biomedical Chemistry, Pogodinskaja str. 10, 119191 Moscow, Russia
| | - Josef Chmelik
- Institute
of Microbiology, The Czech Academy of Sciences, Videnska 1083, 14220 Prague, Czech Republic
| | - Peter Brechlin
- Bruker
Daltonik GmbH, Fahrenheitstraße 4, 28359 Bremen, Germany
| | - Gary Kruppa
- Bruker
s.r.o., Prazakova 60, 619 00 Brno, Czech
Republic
| | - Petr Novak
- Institute
of Microbiology, The Czech Academy of Sciences, Videnska 1083, 14220 Prague, Czech Republic
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28
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Stozicka Z, Korenova M, Uhrinova I, Cubinkova V, Cente M, Kovacech B, Babindakova N, Matyasova K, Vargova G, Novak M, Novak P, Zilka N, Jadhav S. Environmental Enrichment Rescues Functional Deficit and Alters Neuroinflammation in a Transgenic Model of Tauopathy. J Alzheimers Dis 2021; 74:951-964. [PMID: 32116255 DOI: 10.3233/jad-191112] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Alzheimer's disease (AD) is the most frequent neurodegenerative disorder, affecting over 44 million people worldwide. There are no effective pharmaco-therapeutic options for prevention and treatment of AD. Non-pharmacological approaches may help patients suffering from AD to significantly ameliorate disease progression. In this study, we exposed a transgenic rat model (tg) of human tauopathy to enriched environment for 3 months. Behavioral testing at 6 months of age revealed improvement in functional deficits of tg rats reared under enriched conditions, while sedentary tg rats remained severely impaired. Interestingly, enriched environment did not reduce tau pathology. Analysis of neurotrophic factors revealed an increase of nerve growth factor (NGF) levels in the hippocampus of both enriched groups (tg and non-tg rats), reflecting a known effect of enriched environment on the hippocampal formation. On the contrary, NGF levels decreased markedly in the brainstem of enriched groups. The non-pharmacological treatment also reduced levels of tissue inhibitor of metalloproteinase 1 in the brainstem of transgenic rats. Expression analysis of inflammatory pathways revealed upregulation of microglial markers, such as MHC class II and Cd74, whereas levels of pro-inflammatory cytokines remained unaffected by enriched environment. Our results demonstrate that exposure to enriched environment can rescue functional impairment in tau transgenic rats without reducing tau pathology. We speculate that non-pharmacological treatment modulates the immune response to pathological tau protein inclusions, and thus reduces the damage caused by neuroinflammation.
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Affiliation(s)
- Zuzana Stozicka
- Institute of Neuroimmunology, Slovak Academy of Sciences, AD Centre, Bratislava, Slovakia
| | - Miroslava Korenova
- Institute of Neuroimmunology, Slovak Academy of Sciences, AD Centre, Bratislava, Slovakia
| | - Ivana Uhrinova
- Institute of Neuroimmunology, Slovak Academy of Sciences, AD Centre, Bratislava, Slovakia
| | - Veronika Cubinkova
- Institute of Neuroimmunology, Slovak Academy of Sciences, AD Centre, Bratislava, Slovakia
| | - Martin Cente
- Institute of Neuroimmunology, Slovak Academy of Sciences, AD Centre, Bratislava, Slovakia
| | - Branislav Kovacech
- Institute of Neuroimmunology, Slovak Academy of Sciences, AD Centre, Bratislava, Slovakia.,Axon Neuroscience R&D Services SE, Bratislava, Slovakia
| | - Nikoleta Babindakova
- Institute of Neuroimmunology, Slovak Academy of Sciences, AD Centre, Bratislava, Slovakia
| | - Katarina Matyasova
- Institute of Neuroimmunology, Slovak Academy of Sciences, AD Centre, Bratislava, Slovakia
| | - Greta Vargova
- Institute of Neuroimmunology, Slovak Academy of Sciences, AD Centre, Bratislava, Slovakia
| | - Michal Novak
- Institute of Neuroimmunology, Slovak Academy of Sciences, AD Centre, Bratislava, Slovakia.,Axon Neuroscience SE, Larnaca, Cyprus
| | - Petr Novak
- Institute of Neuroimmunology, Slovak Academy of Sciences, AD Centre, Bratislava, Slovakia.,Axon Neuroscience CRM Services SE, Bratislava, Slovakia
| | - Norbert Zilka
- Institute of Neuroimmunology, Slovak Academy of Sciences, AD Centre, Bratislava, Slovakia.,Axon Neuroscience R&D Services SE, Bratislava, Slovakia
| | - Santosh Jadhav
- Institute of Neuroimmunology, Slovak Academy of Sciences, AD Centre, Bratislava, Slovakia.,Axon Neuroscience R&D Services SE, Bratislava, Slovakia
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Santoro E, Kalita P, Novak P. The role of saline nasal sprays or drops in nasal hygiene: a review of the evidence and clinical perspectives. RHINOL 2021. [DOI: 10.4193/rhinol/20.072] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
Background: This article provides, for the first time, a comprehensive view on everyday practice and evidence-based advice on the regular use of saline nasal sprays or drops to support nasal function and to help protect from airborne pollutants, pollens and viruses. Method: An extensive literature search was conducted with PubMed, Google Scholar and national healthcare databases to identify and summarise the evidence available to date on the role of saline nasal sprays or drops in nasal hygiene. Clinical perspectives from international respiratory specialists were included. Results: Following the PubMed searches, twenty-three articles were assessed in adults and children using isotonic or hypertonic saline nasal sprays and drops, including five systematic reviews and 11 randomised controlled trials. Six national clinical guidance documents were included from the other database searches to give a total of 29 articles. The findings support that regular, daily use of saline nasal sprays or drops could provide relief from nasal symptoms in adults and children with upper respiratory tract infections or allergic rhinitis; future studies are expected to demonstrate benefit following air pollutant exposure. No serious adverse events were reported. National guidance recommends daily nasal hygiene with saline sprays and drops, some from infancy. Conclusion: Regular, daily use of saline nasal spray or drops could reduce the effects of noxious stimuli in the nose, helping to support respiratory health.
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Abstract
Protein hydrogen/deuterium exchange (HDX) coupled to mass spectrometry (MS) can be used to study interactions of proteins with various ligands, to describe the effects of mutations, or to reveal structural responses of proteins to different experimental conditions. It is often described as a method with virtually no limitations in terms of protein size or sample composition. While this is generally true, there are, however, ligands or buffer components that can significantly complicate the analysis. One such compound, that can make HDX-MS troublesome, is DNA. In this chapter, we will focus on the analysis of protein-DNA interactions, describe the detailed protocol, and point out ways to overcome the complications arising from the presence of DNA.
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Affiliation(s)
- Ruzena Filandrova
- Institute of Microbiology of the Czech Academy of Sciences, Prague, Czech Republic
- Faculty of Sciences, Charles University, Prague, Czech Republic
| | - Daniel Kavan
- Institute of Microbiology of the Czech Academy of Sciences, Prague, Czech Republic
| | - Alan Kadek
- Institute of Microbiology of the Czech Academy of Sciences, Prague, Czech Republic
- Heinrich Pette Institute, Leibniz Institute for Experimental Virology, Hamburg, Germany
| | - Petr Novak
- Institute of Microbiology of the Czech Academy of Sciences, Prague, Czech Republic
| | - Petr Man
- Institute of Microbiology of the Czech Academy of Sciences, Prague, Czech Republic.
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Bednarska J, Novak P, Korchev Y, Rorsman P, Tarasov AI, Shevchuk A. Release of insulin granules by simultaneous, high-speed correlative SICM-FCM. J Microsc 2020; 282:21-29. [PMID: 33089519 DOI: 10.1111/jmi.12972] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2020] [Accepted: 10/19/2020] [Indexed: 11/27/2022]
Abstract
Exocytosis of peptides and steroids stored in a dense core vesicular (DCV) form is the final step of every secretory pathway, indispensable for the function of nervous, endocrine and immune systems. The lack of live imaging techniques capable of direct, label-free visualisation of DCV release makes many aspects of the exocytotic process inaccessible to investigation. We describe the application of correlative scanning ion conductance and fluorescence confocal microscopy (SICM-FCM) to study the exocytosis of individual granules of insulin from the top, nonadherent, surface of pancreatic β-cells. Using SICM-FCM, we were first to directly follow the topographical changes associated with physiologically induced release of insulin DCVs. This allowed us to report the kinetics of the full fusion of the insulin vesicle as well as the subsequent solubilisation of the released insulin crystal.
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Affiliation(s)
- J Bednarska
- Department of Medicine, Imperial College London, London, U.K
| | - P Novak
- Department of Medicine, Imperial College London, London, U.K.,National University of Science and Technology 'MISIS', Moscow, Russian Federation
| | - Y Korchev
- Department of Medicine, Imperial College London, London, U.K.,Nano Life Science Institute (WPI-NanoLSI), Kanazawa University, Kakuma-machi, Kanazawa, Japan
| | - P Rorsman
- OCDEM, Radcliffe Department of Medicine, University of Oxford, Oxford, U.K
| | - A I Tarasov
- OCDEM, Radcliffe Department of Medicine, University of Oxford, Oxford, U.K.,School of Biomedical Sciences, Ulster University, Coleraine, U.K
| | - Andrew Shevchuk
- Department of Medicine, Imperial College London, London, U.K
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Fialova J, Hrabak J, Studentova V, Kavan D, Pompach P, Novak P. Three-Dimensional Printed Target Plates for Matrix-Assisted Laser Desorption/Ionization Mass Spectrometry. Anal Chem 2020; 92:12783-12788. [DOI: 10.1021/acs.analchem.0c01737] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jana Fialova
- Institute of Microbiology of the Czech Academy of Sciences, BIOCEV, Prumyslova 595, 252 50 Vestec, Czech Republic
- Department of Analytical Chemistry, University of Chemistry and Technology Prague, Technicka 5, 166 28 Prague 6, Czech Republic
| | - Jaroslav Hrabak
- Biomedical Center and Department of Microbiology, Faculty of Medicine in Pilsen, Charles University, Alej Svobody 76, 323 00 Plzen, Czech Republic
| | - Vendula Studentova
- Biomedical Center and Department of Microbiology, Faculty of Medicine in Pilsen, Charles University, Alej Svobody 76, 323 00 Plzen, Czech Republic
| | - Daniel Kavan
- Institute of Microbiology of the Czech Academy of Sciences, BIOCEV, Prumyslova 595, 252 50 Vestec, Czech Republic
| | - Petr Pompach
- Institute of Microbiology of the Czech Academy of Sciences, BIOCEV, Prumyslova 595, 252 50 Vestec, Czech Republic
- Institute of Biotechnology of the Czech Academy of Sciences, BIOCEV, Prumyslova 595, 252 50 Vestec, Czech Republic
| | - Petr Novak
- Institute of Microbiology of the Czech Academy of Sciences, BIOCEV, Prumyslova 595, 252 50 Vestec, Czech Republic
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Novak P, Zilka N, Zilkova M, Kovacech B, Skrabana R, Ondrus M, Fialova L, Kontsekova E, Otto M, Novak M. AADvac1, an Active Immunotherapy for Alzheimer's Disease and Non Alzheimer Tauopathies: An Overview of Preclinical and Clinical Development. J Prev Alzheimers Dis 2020; 6:63-69. [PMID: 30569088 DOI: 10.14283/jpad.2018.45] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Neurofibrillary tau protein pathology is closely associated with the progression and phenotype of cognitive decline in Alzheimer's disease and other tauopathies, and a high-priority target for disease-modifying therapies. Herein, we provide an overview of the development of AADvac1, an active immunotherapy against tau pathology, and tau epitopes that are potential targets for immunotherapy. The vaccine leads to the production of antibodies that target conformational epitopes in the microtubule-binding region of tau, with the aim to prevent tau aggregation and spreading of pathology, and promote tau clearance. The therapeutic potential of the vaccine was evaluated in transgenic rats and mice expressing truncated, non mutant tau protein, which faithfully replicate of human tau pathology. Treatment with AADvac1 resulted in reduction of neurofibrillary pathology and insoluble tau in their brains, and amelioration of their deleterious phenotype. The vaccine was highly immunogenic in humans, inducing production of IgG antibodies against the tau peptide in 29/30 treated elderly patients with mild-to-moderate Alzheimer's. These antibodies were able to recognise insoluble tau proteins in Alzheimer patients' brains. Treatment with AADvac1 proved to be remarkably safe, with injection site reactions being the only adverse event tied to treatment. AADvac1 is currently being investigated in a phase 2 study in Alzheimer's disease, and a phase 1 study in non-fluent primary progressive aphasia, a neurodegenerative disorder with a high tau pathology component.
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Affiliation(s)
- P Novak
- P. Novak, Axon Neuroscience CRM Services SE, Slovakia, +421911187237,
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Prochazka, V, Burvalova A, Vrba V, Kopp J, Novak P. Formation of Cobalt Ferrites Investigated by Transmission and Emission Mössbauer Spectroscopy. Acta Chim Slov 2020. [DOI: 10.17344/acsi.2019.5551] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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Prochazka V, Burvalova A, Vrba V, Kopp J, Novak P. Formation of Cobalt Ferrites Investigated by Transmission and Emission Mössbauer Spectroscopy. Acta Chim Slov 2020; 67:522-529. [PMID: 33855567] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023] Open
Abstract
This study focuses on cobalt and iron ordering within a ferrite structure CoxFe3-xO4, formed during a solid-state reaction of ?-Fe2O3 and CoCl2. A unique combination of transmission and emission Mössbauer spectroscopy was employed to inspect selectively the positions of iron and cobalt atoms in the structure. The comparison of transmission and emission spectra allowed the determination of tetrahedral and octahedral positions occupation. The presented method of combining the two Mössbauer spectroscopy techniques is suitable for any compounds containing both iron and cobalt atoms. Additional information concerning the samples composition and morphology were obtained by X-ray powder diffraction and scanning electron microscopy. An increased level of Co atoms incorporation into the structure of ferrite was revealed when higher amounts of Co entered the reaction.
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Main P, Hata T, Loo TS, Man P, Novak P, Havlíček V, Norris GE, Patchett ML. Bacteriocin ASM1 is an
O
/
S
‐diglycosylated, plasmid‐encoded homologue of glycocin F. FEBS Lett 2020; 594:1196-1206. [DOI: 10.1002/1873-3468.13708] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2019] [Revised: 11/20/2019] [Accepted: 11/21/2019] [Indexed: 01/01/2023]
Affiliation(s)
- Patrick Main
- School of Fundamental Sciences Massey University Palmerston North New Zealand
| | - Tomomi Hata
- Department of Food and Nutritional Sciences Ochanomizu University Tokyo Japan
| | - Trevor S. Loo
- School of Fundamental Sciences Massey University Palmerston North New Zealand
| | - Petr Man
- Institute of Microbiology, v.v.i. Academy of Sciences of the Czech Republic Prague 4 Czech Republic
| | - Petr Novak
- Institute of Microbiology, v.v.i. Academy of Sciences of the Czech Republic Prague 4 Czech Republic
| | - Vladimír Havlíček
- Institute of Microbiology, v.v.i. Academy of Sciences of the Czech Republic Prague 4 Czech Republic
| | - Gillian E. Norris
- School of Fundamental Sciences Massey University Palmerston North New Zealand
- Maurice Wilkins Centre for Molecular Biodiscovery University of Auckland New Zealand
| | - Mark L. Patchett
- School of Fundamental Sciences Massey University Palmerston North New Zealand
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Galindo-Mendez B, Trevino JA, McGlinchey R, Fortier C, Lioutas V, Novak P, Mantzoros CS, Ngo L, Novak V. Memory advancement by intranasal insulin in type 2 diabetes (MemAID) randomized controlled clinical trial: Design, methods and rationale. Contemp Clin Trials 2020; 89:105934. [PMID: 31923471 PMCID: PMC7242142 DOI: 10.1016/j.cct.2020.105934] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2019] [Revised: 12/06/2019] [Accepted: 01/03/2020] [Indexed: 01/21/2023]
Abstract
BACKGROUND Type 2 diabetes mellitus (T2DM) accelerates brain aging and increases the risk for dementia. Insulin is a key neurotrophic factor in the brain, where it modulates energy metabolism, neurovascular coupling, and regeneration. Impaired insulin-mediated brain signaling and central insulin resistance may contribute to cognitive and functional decline in T2DM. Intranasal insulin (INI) has emerged as a potential therapy for treating T2DM-related cognitive impairment. METHODS/DESIGN Ongoing from 2015, a prospective, two-center, randomized, double-blind, placebo-controlled trial of 210 subjects (120 T2DM and 90 non-diabetic older adults) randomized into four treatment arms (60 T2DM-INI, 60 T2DM-Placebo, 45 Control-INI, and 45 Control-Placebo) evaluating the long-term effects of daily intranasal administration of 40 International Units (IU) of human insulin, as compared to placebo (sterile saline) over 24 weeks and 24 weeks of post-treatment follow-up. Study outcomes are: 1) long-term INI effects on cognition, daily functionality, and gait speed; 2) identifying a clinically relevant phenotype that predicts response to INI therapy; 3) long-term safety. CONCLUSION This study addresses an important knowledge gap about the long-term effects of intranasal insulin on memory and cognition in older people with T2DM and non-diabetic controls, and may provide a novel therapeutic target for prevention and treatment of cognitive and functional decline and dementia. Trial Registration NCT02415556.
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Affiliation(s)
- B Galindo-Mendez
- Department of Neurology, SAFE Laboratory, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - J A Trevino
- Department of Neurology, SAFE Laboratory, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - R McGlinchey
- Translational Research Center for TBI and Stress Disorders (TRACTS), Geriatric Research Education and Clinical Center (GRECC), VA Boston Healthcare System, Boston, MA, USA; Department of Psychiatry, Harvard Medical School, Boston, MA, USA
| | - C Fortier
- Translational Research Center for TBI and Stress Disorders (TRACTS), Geriatric Research Education and Clinical Center (GRECC), VA Boston Healthcare System, Boston, MA, USA; Department of Psychiatry, Harvard Medical School, Boston, MA, USA
| | - V Lioutas
- Department of Neurology, SAFE Laboratory, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - P Novak
- Autonomic Laboratory, Department of Neurology, Brigham and Women's Faulkner Hospital, Harvard Medical School, Boston, MA, USA
| | - C S Mantzoros
- Division of Endocrinology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston MA; Department of Medicine, Boston VA Healthcare System, Harvard Medical School, Boston, MA
| | - L Ngo
- Department of Biostatistics, Harvard T.H. Chan School of Public Health, Boston, MA, USA
| | - V Novak
- Department of Neurology, SAFE Laboratory, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA.
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Wally B, Vyskocil J, Novak P, Huemer C, Sindelar R, Kadera P, Mazak A, Wimmer M. Flexible Production Systems: Automated Generation of Operations Plans Based on ISA-95 and PDDL. IEEE Robot Autom Lett 2019. [DOI: 10.1109/lra.2019.2929991] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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Sutovsky S, Turcani P, Novak P, Zilka N. P2-431: NEUROPATHOLOGY OF EARLY-ONSET FAMILIAL ALZHEIMER'S DISEASE CAUSED BY PRESENILIN-1 MISSENSE MUTATION THR116ASN. Alzheimers Dement 2019. [DOI: 10.1016/j.jalz.2019.06.2838] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Stanislav Sutovsky
- Faculty of Medicine; Comenius University and University Hospital Bratislava; Bratislava Slovakia
| | - Peter Turcani
- Faculty of Medicine; Comenius University and University Hospital Bratislava; Bratislava Slovakia
| | - Petr Novak
- AXON Neuroscience CRM Services SE; Bratislava Slovakia
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Kopp J, Novak P, Kaslik J, Pechousek J. Preparation of Magnetite by Thermally Induced Decomposition of Ferrous Oxalate Dihydrate in the Combined Atmosphere. Acta Chim Slov 2019. [DOI: 10.17344/acsi.2019.4933] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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41
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Kopp J, Novak P, Kaslik J, Pechousek J. Preparation of Magnetite by Thermally Induced Decomposition of Ferrous Oxalate Dihydrate in the Combined Atmosphere. Acta Chim Slov 2019; 66:455-465. [PMID: 33855500] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023] Open
Abstract
This study presents an investigation of thermal decomposition of ferrous oxalate dihydrate in the combined atmosphere of inert and conversion gases to find an optimal route for a simple magnetite preparation. Homogenized precursor was isothermally treated inside the stainless-steel cells at 8 equidistant temperatures ranging from 300 to 650 °C for 1, 6, and 12 hours. The enclosure of samples inside the cells with the combined atmosphere eliminates the necessity of the inert gas to flow over the treated samples. Structural, magnetic, and morphological aspects of the prepared materials were examined by the combination of experimental techniques, such as Mössbauer spectroscopy, X-ray powder diffraction, and scanning electron microscopy.
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Affiliation(s)
- B Winblad
- Department of Neurobiology, Care Sciences and Society, Center for Alzheimer Research, Division of Neurogeriatrics, Karolinska Institutet, Solna, Sweden.,Theme Aging, Karolinska University Hospital, Stockholm, Sweden
| | - M Ankarcrona
- Department of Neurobiology, Care Sciences and Society, Center for Alzheimer Research, Division of Neurogeriatrics, Karolinska Institutet, Solna, Sweden
| | - G Johansson
- Department of Neurobiology, Care Sciences and Society, Center for Alzheimer Research, Division of Neurogeriatrics, Karolinska Institutet, Solna, Sweden
| | - P Novak
- Institute of Neuroimmunology, Slovak Academy of Sciences, Bratislava, Slovakia.,AXON Neuroscience CRM Services SE, Bratislava, Slovakia
| | - E Peter Thelin
- Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden.,Division of Neurosurgery, Department of Clinical Neurosciences, University of Cambridge, Cambridge, UK
| | - H Zetterberg
- Department of Psychiatry and Neurochemistry, Institute of Neuroscience and Physiology, the Sahlgrenska Academy at the University of Gothenburg, Mölndal, Sweden.,Clinical Neurochemistry Laboratory, Sahlgrenska University Hospital, Mölndal, Sweden.,UK Dementia Research Institute at UCL, London, UK.,Department of Neurodegenerative Disease, UCL Institute of Neurology, London, UK
| | - K Blennow
- Department of Psychiatry and Neurochemistry, Institute of Neuroscience and Physiology, the Sahlgrenska Academy at the University of Gothenburg, Mölndal, Sweden.,Clinical Neurochemistry Laboratory, Sahlgrenska University Hospital, Mölndal, Sweden
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Moreira SA, Novak P. <p>Effects of pain on cognitive function and mobility</p>. OAJCT 2019. [DOI: 10.2147/oajct.s182502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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44
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Novak P, Kontsekova E, Zilka N, Novak M. Ten Years of Tau-Targeted Immunotherapy: The Path Walked and the Roads Ahead. Front Neurosci 2018; 12:798. [PMID: 30450030 PMCID: PMC6224648 DOI: 10.3389/fnins.2018.00798] [Citation(s) in RCA: 55] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2018] [Accepted: 10/15/2018] [Indexed: 12/14/2022] Open
Abstract
Neurofibrillary pathology comprised of pathological tau protein is closely tied to a range of neurodegenerative disorders, the most common of which is Alzheimer's disease. While they are individually rarer, a range of other disorders, the tauopathies (including Pick's disease, progressive supranuclear palsy, corticobasal degeneration, primary progressive aphasia, and ∼50% of behavioral variant frontotemporal dementia cases) display pronounced underlying tau pathology. In all cases, the distribution and amount of tau pathology closely correlates with the severity and phenotype of cognitive impairment, and with the pattern and degree of brain atrophy. Successfully counteracting tau pathology is likely to halt or slow the progression of these debilitating disorders. This makes tau a target of prime importance, yet an elusive one. The diversity of the tau proteome and post-translational modifications, as well as pathophysiology of tau are reviewed. Beginning 2013, a range of tau-targeted immunotherapies have entered clinical development; these therapies, and their common themes and differences are reviewed. The manuscript provides an extensive discussion on epitope selection for immunotherapies against tau pathology, on immunological mechanisms involved in their action, and challenges such as immune senescence, vaccine design, or evolution of epitopes. Furthermore, we provide methodological recommendations for the characterization of active vaccines and antibodies, animal models, and the target itself - the diseased tau proteome.
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Affiliation(s)
- Petr Novak
- Institute of Neuroimmunology, Slovak Academy of Sciences, Bratislava, Slovakia
- AXON Neuroscience CRM Services SE, Bratislava, Slovakia
| | - Eva Kontsekova
- Institute of Neuroimmunology, Slovak Academy of Sciences, Bratislava, Slovakia
- AXON Neuroscience R&D Services SE, Bratislava, Slovakia
| | - Norbert Zilka
- Institute of Neuroimmunology, Slovak Academy of Sciences, Bratislava, Slovakia
- AXON Neuroscience R&D Services SE, Bratislava, Slovakia
| | - Michal Novak
- Institute of Neuroimmunology, Slovak Academy of Sciences, Bratislava, Slovakia
- AXON Neuroscience SE, Larnaca, Cyprus
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Novak P, Schmidt R, Kontsekova E, Kovacech B, Smolek T, Katina S, Fialova L, Prcina M, Parrak V, Dal-Bianco P, Brunner M, Staffen W, Rainer M, Ondrus M, Ropele S, Smisek M, Sivak R, Zilka N, Winblad B, Novak M. FUNDAMANT: an interventional 72-week phase 1 follow-up study of AADvac1, an active immunotherapy against tau protein pathology in Alzheimer's disease. Alzheimers Res Ther 2018; 10:108. [PMID: 30355322 PMCID: PMC6201586 DOI: 10.1186/s13195-018-0436-1] [Citation(s) in RCA: 69] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/24/2018] [Accepted: 09/26/2018] [Indexed: 11/30/2022]
Abstract
Background Neurofibrillary pathology composed of tau protein is closely correlated with severity and phenotype of cognitive impairment in patients with Alzheimer’s disease and non-Alzheimer’s tauopathies. Targeting pathological tau proteins via immunotherapy is a promising strategy for disease-modifying treatment of Alzheimer’s disease. Previously, we reported a 24-week phase 1 trial on the active vaccine AADvac1 against pathological tau protein; here, we present the results of a further 72 weeks of follow-up on those patients. Methods We did a phase 1, 72-week, open-label study of AADvac1 in patients with mild to moderate Alzheimer’s disease who had completed the preceding phase 1 study. Patients who were previously treated with six doses of AADvac1 at monthly intervals received two booster doses at 24-week intervals. Patients who were previously treated with only three doses received another three doses at monthly intervals, and subsequently two boosters at 24-week intervals. The primary objective was the assessment of long-term safety of AADvac1 treatment. Secondary objectives included assessment of antibody titres, antibody isotype profile, capacity of the antibodies to bind to AD tau and AADvac1, development of titres of AADvac1-induced antibodies over time, and effect of booster doses; cognitive assessment via 11-item Alzheimer’s Disease Assessment Scale cognitive assessment (ADAS-Cog), Category Fluency Test and Controlled Oral Word Association Test; assessment of brain atrophy via magnetic resonance imaging (MRI) volumetry; and assessment of lymphocyte populations via flow cytometry. Results The study was conducted between 18 March 2014 and 10 August 2016. Twenty-six patients who completed the previous study were enrolled. Five patients withdrew because of adverse events. One patient was withdrawn owing to noncompliance. The most common adverse events were injection site reactions (reported in 13 [50%] of vaccinated patients). No cases of meningoencephalitis or vasogenic oedema were observed. New micro-haemorrhages were observed only in one ApoE4 homozygote. All responders retained an immunoglobulin G (IgG) antibody response against the tau peptide component of AADvac1 over 6 months without administration, with titres regressing to a median 15.8% of titres attained after the initial six-dose vaccination regimen. Booster doses restored previous IgG levels. Hippocampal atrophy rate was lower in patients with high IgG levels; a similar relationship was observed in cognitive assessment. Conclusions AADvac1 displayed a benign safety profile. The evolution of IgG titres over vaccination-free periods warrants a more frequent booster dose regimen. The tendency towards slower atrophy in MRI evaluation and less of a decline in cognitive assessment in patients with high titres is encouraging. Further trials are required to expand the safety database and to establish proof of clinical efficacy of AADvac1. Trial registration The studies are registered with the EU Clinical Trials Register and ClinicalTrials.gov: the preceding first-in-human study under EudraCT 2012-003916-29 and NCT01850238 (registered on 9 May 2013) and the follow-up study under EudraCT 2013-004499-36 and NCT02031198 (registered 9 Jan 2014), respectively. Electronic supplementary material The online version of this article (10.1186/s13195-018-0436-1) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Petr Novak
- Axon Neuroscience CRM Services SE, Dvorakovo nabrezie 11, 811 02, Bratislava, Slovakia.
| | - Reinhold Schmidt
- Clinical Division of Neurogeriatrics and Division of General Neurology, Department of Neurology, Medical University Graz, Auenbruggerplatz 2, 8036, Graz, Austria
| | - Eva Kontsekova
- Axon Neuroscience R&D Services SE, Dvorakovo nabrezie 10, 811 02, Bratislava, Slovakia
| | - Branislav Kovacech
- Axon Neuroscience R&D Services SE, Dvorakovo nabrezie 10, 811 02, Bratislava, Slovakia
| | - Tomas Smolek
- Axon Neuroscience R&D Services SE, Dvorakovo nabrezie 10, 811 02, Bratislava, Slovakia
| | - Stanislav Katina
- Axon Neuroscience CRM Services SE, Dvorakovo nabrezie 11, 811 02, Bratislava, Slovakia
| | - Lubica Fialova
- Axon Neuroscience R&D Services SE, Dvorakovo nabrezie 10, 811 02, Bratislava, Slovakia
| | - Michal Prcina
- Axon Neuroscience R&D Services SE, Dvorakovo nabrezie 10, 811 02, Bratislava, Slovakia
| | - Vojtech Parrak
- Axon Neuroscience R&D Services SE, Dvorakovo nabrezie 10, 811 02, Bratislava, Slovakia
| | - Peter Dal-Bianco
- University Clinic of Neurology, Medical University of Vienna, Währinger Gürtel 18-20, 1090, Vienna, Austria
| | - Martin Brunner
- University Clinic of Clinical Pharmacology, Medical University of Vienna, Währinger Gürtel 18-20, 1090, Vienna, Austria
| | - Wolfgang Staffen
- University Clinic of Neurology, Christian-Doppler-Clinic, Ignaz-Harrer-Straße 79, 5020, Salzburg, Austria
| | - Michael Rainer
- Social and Medical Centre East, Danube Hospital, Karl Landsteiner Institute for Memory and Alzheimer Research, Langobardenstraße 122, 1220, Vienna, Austria
| | - Matej Ondrus
- Axon Neuroscience CRM Services SE, Dvorakovo nabrezie 11, 811 02, Bratislava, Slovakia
| | - Stefan Ropele
- Clinical Division of Neurogeriatrics and Division of General Neurology, Department of Neurology, Medical University Graz, Auenbruggerplatz 2, 8036, Graz, Austria
| | - Miroslav Smisek
- Axon Neuroscience CRM Services SE, Dvorakovo nabrezie 11, 811 02, Bratislava, Slovakia
| | - Roman Sivak
- Axon Neuroscience CRM Services SE, Dvorakovo nabrezie 11, 811 02, Bratislava, Slovakia
| | - Norbert Zilka
- Axon Neuroscience R&D Services SE, Dvorakovo nabrezie 10, 811 02, Bratislava, Slovakia
| | - Bengt Winblad
- Division of Neurogeriatrics, Department NVS Clinical Trial Unit, Karolinska Institute Alzheimer Disease Research Centre, Geriatric Clinic, Karolinska University Hospital, Hälsovägen 7, S-14157, Huddinge, Sweden
| | - Michal Novak
- Axon Neuroscience SE, 4, Arch. Makariou & Kalogreon, Nicolaides Sea View City, 5th floor, office 506, 6016, Larnaca, Cyprus
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Darebna P, Spicka J, Kucera R, Topolcan O, Navratilova E, Ruzicka V, Volny M, Novak P, Pompach P. Detection and Quantification of Carbohydrate-Deficient Transferrin by MALDI-Compatible Protein Chips Prepared by Ambient Ion Soft Landing. Clin Chem 2018; 64:1319-1326. [DOI: 10.1373/clinchem.2017.285452] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2017] [Accepted: 05/18/2018] [Indexed: 11/06/2022]
Abstract
Abstract
BACKGROUND
Transferrin is synthetized in the liver and is the most important iron-transport carrier in the human body. Severe alcohol consumption leads to alterations in glycosylation of transferrin. Mass spectrometry can provide fast detection and quantification of transferrin isoforms because they have different molecular masses. In this study, we used antibody chips in combination with MALDI-TOF MS for the detection and quantification of transferrin isoforms.
METHODS
Protein chips were prepared by functionalization of indium tin oxide glass using ambient ion soft landing of electrosprayed antitransferrin antibody. Two microliters of patient serum was applied on the antibody-modified spots, and after incubation, washing, and matrix deposition, transferrin isoforms were detected by MALDI-TOF MS. Peak intensities of each transferrin form were used to calculate total carbohydrate-deficient transferrin (CDT). The CDT values obtained by the MALDI chip method were compared with the results obtained by a standard capillary electrophoresis (CE).
RESULTS
The chip-based MALDI-TOF MS method was used for enrichment and detection of CDT from human serum. A sample cohort from 186 patients was analyzed. Of these samples, 44 were positively identified as belonging to alcoholic patients, whereas 142 were negative by the MALDI chip approach. The correlation of the data obtained by the CE and the chip-based MALDI was r = 0.986, 95% CI.
CONCLUSIONS
Functionalized MALDI chips modified by antitransferrin antibody prepared by ambient ion soft landing were successfully used for detection and quantification of CDT from human sera.
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Affiliation(s)
- Petra Darebna
- Institute of Microbiology, v.v.i., Czech Academy of Sciences, Prague, Czech Republic
- Faculty of Science, Charles University, Prague, Czech Republic
| | - Jan Spicka
- Department of Laboratory Diagnostics, University Hospital Kralovske Vinohrady, Prague, Czech Republic
| | - Radek Kucera
- Department of Immunochemistry, University Hospital in Pilsen, Pilsen, Czech Republic
| | - Ondrej Topolcan
- Department of Immunochemistry, University Hospital in Pilsen, Pilsen, Czech Republic
| | | | | | - Michael Volny
- Institute of Microbiology, v.v.i., Czech Academy of Sciences, Prague, Czech Republic
- AffiPro, s.r.o., Mratin, Czech Republic
| | - Petr Novak
- Institute of Microbiology, v.v.i., Czech Academy of Sciences, Prague, Czech Republic
- Faculty of Science, Charles University, Prague, Czech Republic
- AffiPro, s.r.o., Mratin, Czech Republic
| | - Petr Pompach
- Institute of Microbiology, v.v.i., Czech Academy of Sciences, Prague, Czech Republic
- Faculty of Science, Charles University, Prague, Czech Republic
- AffiPro, s.r.o., Mratin, Czech Republic
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47
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Novak P, Cehlar O, Skrabana R, Novak M. Tau Conformation as a Target for Disease-Modifying Therapy: The Role of Truncation. J Alzheimers Dis 2018; 64:S535-S546. [DOI: 10.3233/jad-179942] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Petr Novak
- Institute of Neuroimmunology, Slovak Academy of Sciences, Bratislava, Slovakia
| | - Ondrej Cehlar
- Institute of Neuroimmunology, Slovak Academy of Sciences, Bratislava, Slovakia
| | - Rostislav Skrabana
- Institute of Neuroimmunology, Slovak Academy of Sciences, Bratislava, Slovakia
| | - Michal Novak
- Institute of Neuroimmunology, Slovak Academy of Sciences, Bratislava, Slovakia
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48
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Smolek T, Jadhav S, Brezovakova V, Cubinkova V, Valachova B, Novak P, Zilka N. First-in-Rat Study of Human Alzheimer's Disease Tau Propagation. Mol Neurobiol 2018; 56:621-631. [PMID: 29770957 DOI: 10.1007/s12035-018-1102-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2017] [Accepted: 05/01/2018] [Indexed: 10/16/2022]
Abstract
One of the key features of misfolded tau in human neurodegenerative disorders is its propagation from one brain area into many others. In the last decade, in vivo tau spreading has been replicated in several mouse transgenic models expressing mutated human tau as well as in normal non-transgenic mice. In this study, we demonstrate for the first time that insoluble tau isolated from human AD brain induces full-blown neurofibrillary pathology in a sporadic rat model of tauopathy expressing non-mutated truncated tau protein. By using specific monoclonal antibodies, we were able to monitor the spreading of tau isolated from human brain directly in the rat hippocampus. We found that exogenous human AD tau was able to spread from the area of injection and induce tau pathology. Interestingly, solubilisation of insoluble AD tau completely abolished the capability of tau protein to induce and spread of neurofibrillary pathology in the rat brain. Our results show that exogenous tau is able to induce and drive neurofibrillary pathology in rat model for human tauopathy in a similar way as it was described in various mouse transgenic models. Rat tau spreading model has many advantages over mouse and other organisms including size and complexity, and thus is highly suitable for identification of pathogenic mechanism of tau spreading.
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Affiliation(s)
- Tomas Smolek
- Institute of Neuroimmunology, Slovak Academy of Sciences, Centre of Excellence for Alzheimer's Disease and Related Disorders, Dubravska 9, 845 10, Bratislava, Slovak Republic.,Axon Neuroscience R&D Services SE, Dvořákovo nábrežie 10, Bratislava, Slovak Republic
| | - Santosh Jadhav
- Institute of Neuroimmunology, Slovak Academy of Sciences, Centre of Excellence for Alzheimer's Disease and Related Disorders, Dubravska 9, 845 10, Bratislava, Slovak Republic.,Axon Neuroscience R&D Services SE, Dvořákovo nábrežie 10, Bratislava, Slovak Republic
| | - Veronika Brezovakova
- Institute of Neuroimmunology, Slovak Academy of Sciences, Centre of Excellence for Alzheimer's Disease and Related Disorders, Dubravska 9, 845 10, Bratislava, Slovak Republic
| | - Veronika Cubinkova
- Institute of Neuroimmunology, Slovak Academy of Sciences, Centre of Excellence for Alzheimer's Disease and Related Disorders, Dubravska 9, 845 10, Bratislava, Slovak Republic.,Axon Neuroscience R&D Services SE, Dvořákovo nábrežie 10, Bratislava, Slovak Republic
| | - Bernadeta Valachova
- Institute of Neuroimmunology, Slovak Academy of Sciences, Centre of Excellence for Alzheimer's Disease and Related Disorders, Dubravska 9, 845 10, Bratislava, Slovak Republic
| | - Petr Novak
- Institute of Neuroimmunology, Slovak Academy of Sciences, Centre of Excellence for Alzheimer's Disease and Related Disorders, Dubravska 9, 845 10, Bratislava, Slovak Republic.,Axon Neuroscience CRM Services SE, Dvořákovo nábrežie 10, Bratislava, Slovak Republic
| | - Norbert Zilka
- Institute of Neuroimmunology, Slovak Academy of Sciences, Centre of Excellence for Alzheimer's Disease and Related Disorders, Dubravska 9, 845 10, Bratislava, Slovak Republic. .,Axon Neuroscience R&D Services SE, Dvořákovo nábrežie 10, Bratislava, Slovak Republic.
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49
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Valachova B, Brezovakova V, Bugos O, Jadhav S, Smolek T, Novak P, Zilka N. A comparative study on pathological features of transgenic rat lines expressing either three or four repeat misfolded tau. J Comp Neurol 2018; 526:1777-1789. [DOI: 10.1002/cne.24447] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2017] [Revised: 03/08/2018] [Accepted: 03/08/2018] [Indexed: 12/17/2022]
Affiliation(s)
- Bernadeta Valachova
- Centre of Excellence for Alzheimer's Disease and Related Disorders; Institute of Neuroimmunology, Slovak Academy of Sciences; Bratislava Slovak Republic
- Axon Neuroscience R&D Services SE; Bratislava Slovak Republic
| | - Veronika Brezovakova
- Centre of Excellence for Alzheimer's Disease and Related Disorders; Institute of Neuroimmunology, Slovak Academy of Sciences; Bratislava Slovak Republic
| | - Ondrej Bugos
- Centre of Excellence for Alzheimer's Disease and Related Disorders; Institute of Neuroimmunology, Slovak Academy of Sciences; Bratislava Slovak Republic
| | - Santosh Jadhav
- Centre of Excellence for Alzheimer's Disease and Related Disorders; Institute of Neuroimmunology, Slovak Academy of Sciences; Bratislava Slovak Republic
- Axon Neuroscience R&D Services SE; Bratislava Slovak Republic
| | - Tomas Smolek
- Centre of Excellence for Alzheimer's Disease and Related Disorders; Institute of Neuroimmunology, Slovak Academy of Sciences; Bratislava Slovak Republic
- Axon Neuroscience R&D Services SE; Bratislava Slovak Republic
| | - Petr Novak
- Centre of Excellence for Alzheimer's Disease and Related Disorders; Institute of Neuroimmunology, Slovak Academy of Sciences; Bratislava Slovak Republic
| | - Norbert Zilka
- Centre of Excellence for Alzheimer's Disease and Related Disorders; Institute of Neuroimmunology, Slovak Academy of Sciences; Bratislava Slovak Republic
- Axon Neuroscience R&D Services SE; Bratislava Slovak Republic
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50
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Abstract
For the development of an implantable artificial endocrine pancreas, a sensor for blood glucose measurement is needed providing a long-term stability. This goal can be achieved by the application of infrared spectroscopy which, unlike electrochemical sensors, responds directly to the glucose molecule. An investigation under physiological conditions revealed five glucose absorption bands in the near and middle infrared range. These are 1040, 1085, 1109, 1160 and 1365 cm–1. Only the 1040 cm–1 frequency coincides with none of the other infrared-active blood substances like proteins, lipids and urea. Nevertheless, the other absorption bands too, especially the 1109 cm–1 frequency, can be used for blood glucose measurement, if the superimposed absorptions are compensated. Methods for the compensation have been found. Technically feasible embodiments of an infrared glucose sensor are described.
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Affiliation(s)
- H. Zeller
- lnstitut für Physikalische Medizin, Baden-Baden - West-Germany
| | - P. Novak
- Dornier Medizintechnik GmbH, Germering - West-Germany
| | - R. Landgraf
- Med. Klinik Innenstadt der Universität München, München, West-Germany
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