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Koch J, Lang A, Whongsiri P, Schulz WA, Hoffmann MJ, Greife A. KDM6A mutations promote acute cytoplasmic DNA release, DNA damage response and mitosis defects. BMC Mol Cell Biol 2021; 22:54. [PMID: 34702163 PMCID: PMC8549169 DOI: 10.1186/s12860-021-00394-2] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Accepted: 10/13/2021] [Indexed: 12/20/2022] Open
Abstract
Background KDM6A, encoding a histone demethylase, is one of the top ten mutated epigenetic cancer genes. The effect of mutations on its structure and function are however poorly characterized. Methods Database search identified nonsense and missense mutations in the N-terminal TPR motifs and the C-terminal, catalytic JmjC domain, but also in the intrinsically disordered region connecting both these two well-structured domains. KDM6A variants with cancer-derived mutations were generated using site directed mutagenesis and fused to eGFP serving as an all-in-one affinity and fluorescence tag to study demethylase activity by an ELISA-based assay in vitro, apoptosis by FACS, complex assembly by Co-immunoprecipitation and localization by microscopy in urothelial cells and apoptosis by FACS. Results Independent of the mutation and demethylase activity, all KDM6A variants were detectable in the nucleus. Truncated KDM6A variants displayed changes in complex assemblies affecting (1) known interactions with the COMPASS complex component RBBP5 and (2) KDM6A-DNA associated assemblies with the nuclear protein Nucleophosmin. Some KDM6A variants induced a severe cellular phenotype characterized by multiple acute effects on nuclear integrity, namely, release of nuclear DNA into the cytoplasm, increased level of DNA damage indicators RAD51 and p-γH2A.X, and mitosis defects. These damaging effects were correlated with increased cell death. Conclusion These observations reveal novel effects of pathogenic variants pointing at new specific functions of KDM6A variants. The underlying mechanisms and affected pathways have to be investigated in future research to understand how tumor cells cope with and benefit from KDM6A truncations. Supplementary Information The online version contains supplementary material available at 10.1186/s12860-021-00394-2.
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Affiliation(s)
- J Koch
- Department of Molecular Physical Chemistry, Heinrich-Heine-University Duesseldorf, Duesseldorf, Germany
| | - A Lang
- Department of Cardiology, Pulmonology, and Vascular Medicine, Medical Faculty, Heinrich-Heine-University Duesseldorf, Duesseldorf, Germany
| | - P Whongsiri
- Department of Urology, Medical Faculty, Heinrich-Heine-University Duesseldorf, Duesseldorf, Germany.,Department of Biochemistry and Microbiology, Faculty of Pharmaceutical Sciences, Chulalongkorn University Bangkog, Bangkok, Thailand
| | - W A Schulz
- Department of Urology, Medical Faculty, Heinrich-Heine-University Duesseldorf, Duesseldorf, Germany
| | - M J Hoffmann
- Department of Urology, Medical Faculty, Heinrich-Heine-University Duesseldorf, Duesseldorf, Germany
| | - A Greife
- Department of Molecular Physical Chemistry, Heinrich-Heine-University Duesseldorf, Duesseldorf, Germany.
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2
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Mokou M, Lygirou V, Angelioudaki I, Paschalidis N, Stroggilos R, Frantzi M, Latosinska A, Hoffmann MJ, Mischak H, Vlahou A. Drug repurposing of bladder cancer driven by patients’ proteomic signatures. Urol Oncol 2020. [DOI: 10.1016/j.urolonc.2020.10.026] [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: 10/22/2022]
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3
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Winther KT, Hoffmann MJ, Boes JR, Mamun O, Bajdich M, Bligaard T. Catalysis-Hub.org, an open electronic structure database for surface reactions. Sci Data 2019; 6:75. [PMID: 31138816 PMCID: PMC6538711 DOI: 10.1038/s41597-019-0081-y] [Citation(s) in RCA: 81] [Impact Index Per Article: 16.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2019] [Accepted: 04/17/2019] [Indexed: 11/08/2022] Open
Abstract
We present a new open repository for chemical reactions on catalytic surfaces, available at https://www.catalysis-hub.org . The featured database for surface reactions contains more than 100,000 chemisorption and reaction energies obtained from electronic structure calculations, and is continuously being updated with new datasets. In addition to providing quantum-mechanical results for a broad range of reactions and surfaces from different publications, the database features a systematic, large-scale study of chemical adsorption and hydrogenation on bimetallic alloy surfaces. The database contains reaction specific information, such as the surface composition and reaction energy for each reaction, as well as the surface geometries and calculational parameters, essential for data reproducibility. By providing direct access via the web-interface as well as a Python API, we seek to accelerate the discovery of catalytic materials for sustainable energy applications by enabling researchers to efficiently use the data as a basis for new calculations and model generation.
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Affiliation(s)
- Kirsten T Winther
- SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California, 94025, United States
- SUNCAT Center for Interface Science and Catalysis, Department of Chemical Engineering, Stanford University, Stanford, California, 94305, United States
| | - Max J Hoffmann
- SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California, 94025, United States
- SUNCAT Center for Interface Science and Catalysis, Department of Chemical Engineering, Stanford University, Stanford, California, 94305, United States
| | - Jacob R Boes
- SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California, 94025, United States
- SUNCAT Center for Interface Science and Catalysis, Department of Chemical Engineering, Stanford University, Stanford, California, 94305, United States
| | - Osman Mamun
- SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California, 94025, United States
- SUNCAT Center for Interface Science and Catalysis, Department of Chemical Engineering, Stanford University, Stanford, California, 94305, United States
| | - Michal Bajdich
- SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California, 94025, United States
| | - Thomas Bligaard
- SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California, 94025, United States.
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4
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Szarvas T, Jardin-Watelet B, Bourgoin N, Hoffmann MJ, Nyirády P, Oláh C, Széll T, Csizmarik A, Hadaschik B, Reis H. High-soluble CGA levels are associated with poor survival in bladder cancer. Endocr Connect 2019; 8:625-633. [PMID: 30999279 PMCID: PMC6510714 DOI: 10.1530/ec-19-0068] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/21/2019] [Accepted: 04/17/2019] [Indexed: 11/26/2022]
Abstract
Recently, a neuroendocrine-like molecular subtype has been discovered in muscle-invasive urothelial bladder cancer (BC). Chromogranin A (CGA) is a widely used tissue and serum marker in neuroendocrine tumors. Our aim was to evaluate serum CGA (sCGA) concentrations and their associations with clinical and follow-up data in BC and renal cell carcinoma (RCC). sCGA concentrations were analyzed in the following cohorts: (1) BC training set (n = 188), (2) BC validation set (n = 125), (3) RCC patients (n = 77), (4) healthy controls (n = 97). CGA immunohistochemistry and RT-qPCR analyses were performed in 20 selected FFPE and 29 frozen BC tissue samples. Acquired data were correlated with clinicopathological parameters including comorbidities with known effect on sCGA as well as with patients' follow-up data. sCGA levels were significantly higher in BC but not in RCC patients compared to healthy controls. High sCGA levels were independently associated with poor overall and disease-specific survival both in the BC training (P < 0.001, P = 0.002) and validation set (P = 0.009, P = 0.017). sCGA levels were inversely correlated with glomerulus filtrating rate (GFR) and linearly correlated with creatinine clearance and urea concentrations. These correlations were not related to the prognostic value of sCGA. Tissue CGA levels were low to absent independently of sCGA concentrations. Our results demonstrate elevated levels and an independent prognostic value for sCGA in BC but not in RCC. Despite the significant correlation between sCGA and GFR, the prognostic relevance of sCGA seems not related to impaired renal function or other comorbidities.
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Affiliation(s)
- T Szarvas
- Department of Urology, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
- Department of Urology, Semmelweis University, Budapest, Hungary
- Correspondence should be addressed to T Szarvas:
| | - B Jardin-Watelet
- Thermo Fisher Scientific Cezanne SAS, Clinical Diagnostics Division, Nimes, France
| | - N Bourgoin
- Thermo Fisher Scientific Cezanne SAS, Clinical Diagnostics Division, Nimes, France
| | - M J Hoffmann
- Department of Urology, Medical Faculty, Heinrich-Heine-University Duesseldorf, Duesseldorf, Germany
| | - P Nyirády
- Department of Urology, Semmelweis University, Budapest, Hungary
| | - C Oláh
- Department of Urology, Semmelweis University, Budapest, Hungary
| | - T Széll
- Department of Urology, Semmelweis University, Budapest, Hungary
| | - A Csizmarik
- Department of Urology, Semmelweis University, Budapest, Hungary
| | - B Hadaschik
- Department of Urology, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
| | - H Reis
- Institute of Pathology, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
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5
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De Wispelaere K, Martínez-Espín JS, Hoffmann MJ, Svelle S, Olsbye U, Bligaard T. Understanding zeolite-catalyzed benzene methylation reactions by methanol and dimethyl ether at operating conditions from first principle microkinetic modeling and experiments. Catal Today 2018. [DOI: 10.1016/j.cattod.2018.02.042] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Abstract
Mean-field microkinetic models in combination with Brønsted-Evans-Polanyi like scaling relations have proven highly successful in identifying catalyst materials with good or promising reactivity and selectivity. Analysis of the microkinetic model by means of lattice kinetic Monte Carlo promises a faithful description of a range of atomistic features involving short-range ordering of species in the vicinity of an active site. In this paper, we use the "fruit fly" example reaction of CO oxidation on fcc(111) transition and coinage metals to motivate and develop a lattice kinetic Monte Carlo solver suitable for the numerically challenging case of vastly disparate rate constants. As a result, we show that for the case of infinitely fast diffusion and absence of adsorbate-adsorbate interaction it is, in fact, possible to match the prediction of the mean-field-theory method and the lattice kinetic Monte Carlo method. As a corollary, we conclude that lattice kinetic Monte Carlo simulations of surface chemical reactions are most likely to provide additional insight over mean-field simulations if diffusion limitations or adsorbate-adsorbate interactions have a significant influence on the mixing of the adsorbates.
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Affiliation(s)
- Max J Hoffmann
- Department of Chemical Engineering , Stanford University , Stanford , California 94305 , United States.,SUNCAT Center for Interface Science and Catalysis, SLAC , National Accelerator Laboratory , 2575 Sand Hill Road , Menlo Park , California 94025 , United States
| | - Thomas Bligaard
- Department of Chemical Engineering , Stanford University , Stanford , California 94305 , United States.,SUNCAT Center for Interface Science and Catalysis, SLAC , National Accelerator Laboratory , 2575 Sand Hill Road , Menlo Park , California 94025 , United States
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7
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Chakraborty D, Damsgaard CD, Silva H, Conradsen C, Olsen JL, Carvalho HWP, Mutz B, Bligaard T, Hoffmann MJ, Grunwaldt JD, Studt F, Chorkendorff I. Bottom-Up Design of a Copper-Ruthenium Nanoparticulate Catalyst for Low-Temperature Ammonia Oxidation. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201703468] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Debasish Chakraborty
- SurfCat, Department of Physics; Technical University of Denmark; Fysikvej, Building 311 2800 Kgs. Lyngby Denmark
| | - Christian Danvad Damsgaard
- SurfCat, Department of Physics; Technical University of Denmark; Fysikvej, Building 311 2800 Kgs. Lyngby Denmark
- Center for Electron Nanoscopy; Technical University of Denmark; Fysikvej, Building 307 2800 Kgs. Lyngby Denmark
| | - Hugo Silva
- SurfCat, Department of Physics; Technical University of Denmark; Fysikvej, Building 311 2800 Kgs. Lyngby Denmark
| | - Christian Conradsen
- SurfCat, Department of Physics; Technical University of Denmark; Fysikvej, Building 311 2800 Kgs. Lyngby Denmark
| | - Jakob Lind Olsen
- SurfCat, Department of Physics; Technical University of Denmark; Fysikvej, Building 311 2800 Kgs. Lyngby Denmark
| | - Hudson W. P. Carvalho
- Centro de Energia Nuclear na Agricultura; Universidade de S. Paulo; P.O. Box 96 13400-970 Piracicaba SP Brazil
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT); Engesserstr. 20 76131 Karlsruhe Germany
- Institute of Catalysis Research and Technology (IKFT), Karlsruhe Institute of Technology (KIT); Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany
| | - Benjamin Mutz
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT); Engesserstr. 20 76131 Karlsruhe Germany
- Institute of Catalysis Research and Technology (IKFT), Karlsruhe Institute of Technology (KIT); Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany
| | | | | | - Jan-Dierk Grunwaldt
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT); Engesserstr. 20 76131 Karlsruhe Germany
- Institute of Catalysis Research and Technology (IKFT), Karlsruhe Institute of Technology (KIT); Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany
| | - Felix Studt
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT); Engesserstr. 20 76131 Karlsruhe Germany
- Institute of Catalysis Research and Technology (IKFT), Karlsruhe Institute of Technology (KIT); Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany
| | - Ib Chorkendorff
- SurfCat, Department of Physics; Technical University of Denmark; Fysikvej, Building 311 2800 Kgs. Lyngby Denmark
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8
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Chakraborty D, Damsgaard CD, Silva H, Conradsen C, Olsen JL, Carvalho HWP, Mutz B, Bligaard T, Hoffmann MJ, Grunwaldt JD, Studt F, Chorkendorff I. Bottom-Up Design of a Copper-Ruthenium Nanoparticulate Catalyst for Low-Temperature Ammonia Oxidation. Angew Chem Int Ed Engl 2017; 56:8711-8715. [DOI: 10.1002/anie.201703468] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2017] [Indexed: 11/09/2022]
Affiliation(s)
- Debasish Chakraborty
- SurfCat, Department of Physics; Technical University of Denmark; Fysikvej, Building 311 2800 Kgs. Lyngby Denmark
| | - Christian Danvad Damsgaard
- SurfCat, Department of Physics; Technical University of Denmark; Fysikvej, Building 311 2800 Kgs. Lyngby Denmark
- Center for Electron Nanoscopy; Technical University of Denmark; Fysikvej, Building 307 2800 Kgs. Lyngby Denmark
| | - Hugo Silva
- SurfCat, Department of Physics; Technical University of Denmark; Fysikvej, Building 311 2800 Kgs. Lyngby Denmark
| | - Christian Conradsen
- SurfCat, Department of Physics; Technical University of Denmark; Fysikvej, Building 311 2800 Kgs. Lyngby Denmark
| | - Jakob Lind Olsen
- SurfCat, Department of Physics; Technical University of Denmark; Fysikvej, Building 311 2800 Kgs. Lyngby Denmark
| | - Hudson W. P. Carvalho
- Centro de Energia Nuclear na Agricultura; Universidade de S. Paulo; P.O. Box 96 13400-970 Piracicaba SP Brazil
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT); Engesserstr. 20 76131 Karlsruhe Germany
- Institute of Catalysis Research and Technology (IKFT), Karlsruhe Institute of Technology (KIT); Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany
| | - Benjamin Mutz
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT); Engesserstr. 20 76131 Karlsruhe Germany
- Institute of Catalysis Research and Technology (IKFT), Karlsruhe Institute of Technology (KIT); Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany
| | | | | | - Jan-Dierk Grunwaldt
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT); Engesserstr. 20 76131 Karlsruhe Germany
- Institute of Catalysis Research and Technology (IKFT), Karlsruhe Institute of Technology (KIT); Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany
| | - Felix Studt
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT); Engesserstr. 20 76131 Karlsruhe Germany
- Institute of Catalysis Research and Technology (IKFT), Karlsruhe Institute of Technology (KIT); Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany
| | - Ib Chorkendorff
- SurfCat, Department of Physics; Technical University of Denmark; Fysikvej, Building 311 2800 Kgs. Lyngby Denmark
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9
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Hoffmann MJ, Engelmann F, Matera S. A practical approach to the sensitivity analysis for kinetic Monte Carlo simulation of heterogeneous catalysis. J Chem Phys 2017; 146:044118. [PMID: 28147552 DOI: 10.1063/1.4974261] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Lattice kinetic Monte Carlo simulations have become a vital tool for predictive quality atomistic understanding of complex surface chemical reaction kinetics over a wide range of reaction conditions. In order to expand their practical value in terms of giving guidelines for the atomic level design of catalytic systems, it is very desirable to readily evaluate a sensitivity analysis for a given model. The result of such a sensitivity analysis quantitatively expresses the dependency of the turnover frequency, being the main output variable, on the rate constants entering the model. In the past, the application of sensitivity analysis, such as degree of rate control, has been hampered by its exuberant computational effort required to accurately sample numerical derivatives of a property that is obtained from a stochastic simulation method. In this study, we present an efficient and robust three-stage approach that is capable of reliably evaluating the sensitivity measures for stiff microkinetic models as we demonstrate using the CO oxidation on RuO2(110) as a prototypical reaction. In the first step, we utilize the Fisher information matrix for filtering out elementary processes which only yield negligible sensitivity. Then we employ an estimator based on the linear response theory for calculating the sensitivity measure for non-critical conditions which covers the majority of cases. Finally, we adapt a method for sampling coupled finite differences for evaluating the sensitivity measure for lattice based models. This allows for an efficient evaluation even in critical regions near a second order phase transition that are hitherto difficult to control. The combined approach leads to significant computational savings over straightforward numerical derivatives and should aid in accelerating the nano-scale design of heterogeneous catalysts.
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Affiliation(s)
- Max J Hoffmann
- SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - Felix Engelmann
- Chair of Theoretical Chemistry, Technische Universität München, Lichtenbergstraße 4, 85747 Garching, Germany
| | - Sebastian Matera
- Institute for Mathematics, Freie Universität Berlin, Arnimallee 6, 14195 Berlin, Germany
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10
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Niegisch G, Hoffmann MJ, Koutsogiannouli EA, Schulz WA. [Epigenetics in urothelial cancer: Pathogenesis, improving diagnostics and developing novel treatment options]. Urologe A 2016; 54:526-32. [PMID: 25784269 DOI: 10.1007/s00120-014-3756-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Urothelial carcinoma of the bladder is a common tumor for which improvements in diagnostic markers and new therapy approaches, in addition to or combined with standard chemotherapy, are urgently required. Epigenetic alterations could provide both novel diagnostic markers and therapeutic targets as they are emerging as crucial factors in the development and progression of this tumor type, likely contributing to altered differentiation and metastatic potential. These alterations affect DNA methylation, histone modifications, chromatin remodeling, long noncoding RNAs, and microRNAs. Factors involved in histone modifications and chromatin remodeling appear to be particularly frequently inactivated by mutations. Thus, histone-modifying enzymes may represent good targets for rational new therapeutic approaches, although thorough investigation of their complex functions is a prerequisite. DNA methylation changes and altered miRNA expression provide promising biomarkers for diagnosis and prognosis that need further validation in comprehensive and well-standardized studies.
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Affiliation(s)
- G Niegisch
- Medizinische Fakultät, Urologische Klinik, Heinrich-Heine-Universität Düsseldorf, Moorenstraße 5, 40225, Düsseldorf, Deutschland,
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Hoffmann MJ, Scheffler M, Reuter K. Multi-lattice Kinetic Monte Carlo Simulations from First Principles: Reduction of the Pd(100) Surface Oxide by CO. ACS Catal 2015. [DOI: 10.1021/cs501352t] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Max J. Hoffmann
- Chair
for Theoretical Chemistry and Catalysis Research Center, Technische Universität München, Lichtenbergstrasse 4, 85747 Garching, Germany
| | - Matthias Scheffler
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - Karsten Reuter
- Chair
for Theoretical Chemistry and Catalysis Research Center, Technische Universität München, Lichtenbergstrasse 4, 85747 Garching, Germany
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12
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Blomberg S, Hoffmann MJ, Gustafson J, Martin NM, Fernandes VR, Borg A, Liu Z, Chang R, Matera S, Reuter K, Lundgren E. In situ x-ray photoelectron spectroscopy of model catalysts: at the edge of the gap. Phys Rev Lett 2013; 110:117601. [PMID: 25166577 DOI: 10.1103/physrevlett.110.117601] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2012] [Indexed: 06/03/2023]
Abstract
We present high-pressure x-ray photoelectron spectroscopy (HP-XPS) and first-principles kinetic Monte Carlo study addressing the nature of the active surface in CO oxidation over Pd(100). Simultaneously measuring the chemical composition at the surface and in the near-surface gas phase, we reveal both O-covered pristine Pd(100) and a surface oxide as stable, highly active phases in the near-ambient regime accessible to HP-XPS. Surprisingly, no adsorbed CO can be detected during high CO(2) production rates, which can be explained by a combination of a remarkably short residence time of the CO molecule on the surface and mass-transfer limitations in the present setup.
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Affiliation(s)
- S Blomberg
- Division of Synchrotron Radiation Research, Lund University, Box 118, SE-221 00 Lund, Sweden
| | - M J Hoffmann
- Department Chemie, Technische Universität München, Lichtenbergstrasse 4, D-85747 Garching, Germany
| | - J Gustafson
- Division of Synchrotron Radiation Research, Lund University, Box 118, SE-221 00 Lund, Sweden
| | - N M Martin
- Division of Synchrotron Radiation Research, Lund University, Box 118, SE-221 00 Lund, Sweden
| | - V R Fernandes
- Department of Physics, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway
| | - A Borg
- Department of Physics, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway
| | - Z Liu
- ALS, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - R Chang
- ALS, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - S Matera
- Department Chemie, Technische Universität München, Lichtenbergstrasse 4, D-85747 Garching, Germany
| | - K Reuter
- Department Chemie, Technische Universität München, Lichtenbergstrasse 4, D-85747 Garching, Germany
| | - E Lundgren
- Division of Synchrotron Radiation Research, Lund University, Box 118, SE-221 00 Lund, Sweden
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Keck B, Merseburger AS, Stöhr R, Füssel S, Hoffmann MJ, Schmid S, Olbert P, Hartmann A, Nawroth R. [Bladder cancer in focus: update 2012 of the German Bladder Cancer Association]. Urologe A 2013; 52:373-7. [PMID: 23358832 DOI: 10.1007/s00120-012-3111-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The German Bladder Cancer Association (DFBK) invited its members to the 3rd annual meeting 2012 in Hannover 4 years after the official founding. The meeting was directed to discuss the progress of ongoing and newly initiated projects and collaborations. In this article we will introduce current research activities and collaborations of the DFBK and would like to invite interested researchers to join this national interdisciplinary research association. The aim of the DFBK is to initiate interdisciplinary collaboration and to support scientific discussions among its members. For further information please visit our website at www.forschungsverbund-blasenkarzinom.de.
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Affiliation(s)
- B Keck
- Klinik für Urologie, Universitätsklinikum Erlangen, Erlangen, Deutschland
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14
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Erdem E, Eichel RA, Kungl H, Hoffmann MJ, Ozarowski A, Van Tol J, Brunel LC. Characterization of (Fe'Zr,Ti - VO..). defect dipoles in (La,Fe)-codoped PZT 52.5/47.5 piezoelectric ceramics by multifrequency electron paramagnetic resonance spectroscopy. IEEE Trans Ultrason Ferroelectr Freq Control 2008; 55:1061-1068. [PMID: 18519213 DOI: 10.1109/tuffc.2008.757] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Ferroelectric 1 mol.% La(3)+ and 0.5 mol.% Fe(3)+ codoped Pb[Zr0(0.54)Ti0(0.46)]O(3) ceramics were studied by means of multifrequency electron paramagnetic resonance (EPR) spectroscopy. The obtained results prove that iron is incorporated at the [Zr,Ti]-site, acting as an acceptor and building a charged Fe'(Zr,Ti) - V(O)..)(.) defect dipole with a directly coordinated oxygen vacancy for partial charge compensation. This feature of the defect associates has hitherto been identified only in hard, exclusively Fe(3)+-doped PZT compounds. The present results show, however, that a similar defect association of the Fe3+ functional center with a V(O)..) also exists in soft, donor-acceptor (La(3)+,Fe(3)+)-codoped PZT. According to models developed by Arlt et al. electric dipoles from defect associates, such as the Fe'(Zr,Ti) - V(O)..)(.) defect associate, which may give rise to an internal bias field that is discussed being responsible for ferroelectric aging.
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Affiliation(s)
- Emre Erdem
- Eduard-Zintl-Institute, Darmstadt University of Technology, D-64287 Darmstadt, Germany
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15
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Abstract
Sprouty proteins encoded by the SPRY genes act as modulators and feedback inhibitors of signalling by epidermal growth factor (EGF) and fibroblast growth factor (FGF). Overactivity of EGF and FGF signalling common in prostate cancer might therefore be exacerbated by Sprouty down-regulation. Indeed, down-regulation of SPRY1 and SPRY2 expression has been independently reported. We found both genes modestly down-regulated by microarray expression analysis of microdissected prostate cancers and by quantitative RT-PCR in macrodissected specimens compared with benign tissues. Importantly, the decreases paralleled each other and expression levels of both genes were significantly lower in cancers that recurred within the average follow-up period of 32 months. In contrast to a previous report, no hypermethylation was found to accompany down-regulation of SPRY2 in cancer tissues and cell lines. We additionally investigated the expression of an SPRY1 alternative transcript presumed to be specific for fetal tissues and found its expression moderately well correlated with expression of the standard transcript through diverse tissues and cell lines. The present study confirms and extends previous reports by demonstrating concomitant down-regulation and a significant association with recurrence of SPRY genes.
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Affiliation(s)
- S Fritzsche
- Department of Urology, Heinrich-Heine University, Düsseldorf, Moorenstr. 5, 40225 Düsseldorf, Germany
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Kalf GF, Hazel BA, Hoffmann MJ, Kim DD, Snyder R. The interaction of 1,4-benzoquinone, a bioreactive intermediate of benzene, with three proteins essential for differentiation/maturation of the mouse myeloid stem cell. Adv Exp Med Biol 2002; 500:429-39. [PMID: 11764976 DOI: 10.1007/978-1-4615-0667-6_65] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Affiliation(s)
- G F Kalf
- Department of Biochemistry and Molecular Pharmacology, Jefferson Medical College of Thomas Jefferson University, Philadelphia, PA, USA
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Hoffmann MJ, Sinko PJ, Meeker RJ, Snyder R. Pharmacokinetics of benzene following an oral or intradermal dose in FVB and Tg.AC mice. Adv Exp Med Biol 2002; 500:455-8. [PMID: 11764980 DOI: 10.1007/978-1-4615-0667-6_68] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Affiliation(s)
- M J Hoffmann
- Department of Toxicology, Rutgers University, Piscataway, NJ 08855-8020, USA
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Hoffmann MJ, Kim DD, Akbar MG, Kalf GF, Snyder R. The potential role of topoisomerase II inhibition in hydroquinone-induced alterations in the maturation of mouse myeloblasts. Adv Exp Med Biol 2002; 500:315-8. [PMID: 11764958 DOI: 10.1007/978-1-4615-0667-6_48] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Affiliation(s)
- M J Hoffmann
- Department of Toxicology, Rutgers University, Piscataway, NJ 08854-8020, USA
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Hoffmann MJ, Sinko PJ, Lee YH, Meeker RJ, Snyder R. Pharmacokinetic studies in Tg.AC and FVB mice administered [14C] benzene either by oral gavage or intradermal injection. Toxicol Appl Pharmacol 2001; 174:139-45. [PMID: 11446829 DOI: 10.1006/taap.2001.9203] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Chronic benzene toxicity has been demonstrated to result in either aplastic anemia or acute myelogenous leukemia, a form of granulocytic leukemia, in exposed people (Snyder and Kalf, Crit. Rev. Toxicol. 24, 177-209, 1994). Aplastic anemia has been demonstrated in animal models following benzene exposure but, heretofore, it has not been possible to replicate benzene-induced granulocytic leukemia in animals. The Tg.AC mouse appears to be the first animal model in which a granulocytic leukemia was produced by treatment with benzene (Tennant et al., The Use of Short- and Medium-Term Tests for Carcinogenic Hazard Evaluation, 1999; French and Saulnier, J. Toxicol. Environ. Health 61, 377-379, 2000). Leukemia was observed in Tg.AC mice to which benzene was administered dermally. Neither orally dosed Tg.AC mice or mice of the parental FVB strain treated by either route of exposure developed leukemia. It is well established that benzene metabolism is required to produce benzene toxicity. To determine whether metabolic differences arising from differences in route of exposure or strain of mouse directed the development of leukemia, the pharmacokinetics of benzene were compared between the two strains and between the two routes of administration. Regardless of the route of exposure or the strain of mouse, seven major metabolites plus unmetabolized benzene were detected in most samples at most time points. Few differences were observed between the two strains following either route of administration. These results suggest that the genetic modification in the Tg.AC mouse, i.e., insertion of the v-Ha-ras construct into the genome, did not disrupt any major pathways involved in determining the pharmacokinetics of benzene. Two significant differences were observed between the two routes of exposure: first, benzene was absorbed more slowly after intradermal injection than after oral gavage, and second, the intradermally dosed mice produced more conjugates of hydroquinone than did the orally dosed mice. These differences in metabolism may be involved in the previously observed differences in hematotoxicity between the two routes of exposure.
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Affiliation(s)
- M J Hoffmann
- Joint Graduate Program in Toxicology, Rutgers University, Piscataway, New Jersey 08854-8020, USA
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20
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Abstract
A previous report from this laboratory focused on the metabolism of [14C]benzene (BZ) in the isolated, perfused, mouse liver (C. C. Hedli, et al., 1997, Toxicol. Appl. Pharmacol. 146, 60-68). Whereas administration of BZ to mice results in bone marrow depression (R. Snyder et al., 1993, Res. Commun. Chem. Pathol. Pharmacol. 20, 191-194), administration of phenol (P), the major metabolite of BZ, does not. It was, therefore, of interest to determine whether the metabolic fate of P produced during BZ metabolism differed from that of P metabolized in the absence of BZ. Mouse livers were perfused with a solution of [14C]P in both the orthograde (portal vein to central vein) and retrograde (central vein to portal vein) direction to investigate the metabolic zonation of enzymes involved in P hydroxylation and conjugation. Perfusate samples were collected, separated by HPLC, and tested for radioactivity. Unconjugated metabolites were identified by comparing their retention times with nonradiolabeled standards, which were detected by UV absorption. Conjugated metabolites were identified and collected on the basis of radiochromatogram results, hydrolyzed enzymatically, and identified by co-chromatography with unlabeled BZ metabolites. The objective was to compare and quantify the metabolites formed during the perfusion of P in the orthograde and retrograde directions and to compare the orthograde P-perfusion results with the orthograde BZ results reported previously. Regardless of the direction of P perfusion, the major compounds released from the liver were P. phenylgucuronide, phenylsulfate, hydroquinone (HQ), and HQ glucuronide. A comparison of the results of perfusing P in the orthograde versus the retrograde direction showed that more P was recovered unchanged and more HQ was formed during retrograde perfusion. The results suggest that enzymes involved in P hydroxylation are generally closer to the central vein than those involved in conjugation, and that during retrograde perfusion, P metabolism may be limited by the sub-optimal conditions of perfusion. Comparison of the orthograde perfusion studies of P and BZ revealed that a larger percentage of the radioactivity released from the liver was identified as unconjugated HQ after BZ perfusion than after P perfusion. In addition, the amount of radioactivity covalently bound to liver macromolecules was measured after each perfusion and determined to be proportional to the amount of HQ and HQG detected in the perfusate samples.
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Affiliation(s)
- M J Hoffmann
- Joint Graduate Program in Toxicology and Toxicology Division, Environmental and Occupational Health Sciences Institute, Rutgers University/UMDNJ RWJ Medical School, Piscataway, New Jersey 08854, USA
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21
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Abstract
The hematotoxicity of benzene (BZ) requires its hepatic metabolism, the release of metabolites into the circulation, and the access of metabolites to the bone marrow. Although a range of potentially toxic metabolites produced by the liver was identified using subcellular systems and isolated hepatocytes, these models do not allow identification of the metabolites released from the liver with respect to time and flow through the liver. We developed an isolated perfused mouse liver model to evaluate metabolites released following a single-pass of radiolabeled BZ and after recirculation of single-pass metabolites back through the liver. Reversing the path of flow through the liver changes the orientation of hepatic oxidizing and conjugating enzymes with respect to perfusate flow. Comparison of metabolite production following normal (orthograde, portal vein to hepatic vein) perfusion with reversed (retrograde) perfusion permitted an evaluation of the impact of zonal distributions of these enzymes on BZ metabolism. The major metabolites detected by HPLC, irrespective of the direction of perfusion, were free phenol (P), phenylsulfate (PS), and phenylglucuronide (PG), plus lesser amounts of hydroquinone (HQ) and hydroquinone glucuronide (HQG). Recirculation of the products of single pass orthograde perfusion through the liver yielded P conjugates as well as low levels of free and conjugated HQ. No free P was detected after recirculation. Although no qualitative differences between orthograde and retrograde perfusion were observed, the percentage of free P and P conjugates (PS + PG) found as free P was twice as great following orthograde perfusion as compared to retrograde perfusion. These results suggest that regional differences in the zonation of enzymes involved in oxidation and conjugation may play a critical role in hepatic BZ metabolism.
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Affiliation(s)
- C C Hedli
- Toxicology Division, Environmental and Occupational Health Sciences Institute Rutgers University/ UMDNJ RWJ Medical School, Piscataway, New Jersey 08855, USA
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Abstract
This communication examines the possibility that nitric oxide (NO) production by endothelial cells results from changes in cell membrane fluidity. Lysophosphatidylcholine (LPC) alters fluidity of the endothelial cell membranes causing vascular relaxation. Through membrane alterations LPC influences function of a number of membrane receptors and modulates enzyme activity. As a result of detergent action, lysophosphatidylcholine (LPC) causes activation of guanylate cyclase, stimulates sialyltransferase and regulates protein kinase C activity. It has already been demonstrated that ionic detergents, such as Triton X-100 also cause vascular relaxation, possibly induced by NO production from endothelial cells. It is postulated that production of nitric oxide results from changes in membrane viscosity; this may represent a mechanism for its regulation in biological systems.
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Affiliation(s)
- R J Bing
- Huntington Medical Research Institutes, Department of Experimental Cardiology, Pasadena, CA 91105
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Buttfield IH, Black ML, Hoffmann MJ, Mason EK, Wellby ML, Good BF, Hetzel BS. Studies of the control of thyroid function in endemic goiter in Eastern New Guinea. J Clin Endocrinol Metab 1966; 26:1201-7. [PMID: 4162598 DOI: 10.1210/jcem-26-11-1201] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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25
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Hoffmann MJ, Hetzel BS. The clinical significance of plasma thyroid-stimulating activity in hyperthyroidism. Australas Ann Med 1966; 15:204-9. [PMID: 4168752] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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Good BF, Hetzel BS, Hoffmann MJ, Wellby ML, Black ML, Potter HA, Buttfield IH. Studies of the effects of salicylate in hyperthyroidism. Australas Ann Med 1966; 15:143-51. [PMID: 4162614 DOI: 10.1111/imj.1966.15.2.143] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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