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Demuth S, Paris J, Faddeenkov I, De Sèze J, Gourraud PA. Clinical applications of deep learning in neuroinflammatory diseases: A scoping review. Rev Neurol (Paris) 2024:S0035-3787(24)00522-8. [PMID: 38772806 DOI: 10.1016/j.neurol.2024.04.004] [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] [Subscribe] [Scholar Register] [Received: 02/18/2024] [Revised: 03/26/2024] [Accepted: 04/09/2024] [Indexed: 05/23/2024]
Abstract
BACKGROUND Deep learning (DL) is an artificial intelligence technology that has aroused much excitement for predictive medicine due to its ability to process raw data modalities such as images, text, and time series of signals. OBJECTIVES Here, we intend to give the clinical reader elements to understand this technology, taking neuroinflammatory diseases as an illustrative use case of clinical translation efforts. We reviewed the scope of this rapidly evolving field to get quantitative insights about which clinical applications concentrate the efforts and which data modalities are most commonly used. METHODS We queried the PubMed database for articles reporting DL algorithms for clinical applications in neuroinflammatory diseases and the radiology.healthairegister.com website for commercial algorithms. RESULTS The review included 148 articles published between 2018 and 2024 and five commercial algorithms. The clinical applications could be grouped as computer-aided diagnosis, individual prognosis, functional assessment, the segmentation of radiological structures, and the optimization of data acquisition. Our review highlighted important discrepancies in efforts. The segmentation of radiological structures and computer-aided diagnosis currently concentrate most efforts with an overrepresentation of imaging. Various model architectures have addressed different applications, relatively low volume of data, and diverse data modalities. We report the high-level technical characteristics of the algorithms and synthesize narratively the clinical applications. Predictive performances and some common a priori on this topic are finally discussed. CONCLUSION The currently reported efforts position DL as an information processing technology, enhancing existing modalities of paraclinical investigations and bringing perspectives to make innovative ones actionable for healthcare.
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Affiliation(s)
- S Demuth
- Inserm U1064, CR2TI - Center for Research in Transplantation and Translational Immunology, Nantes University, 44000 Nantes, France; Inserm U1119 : biopathologie de la myéline, neuroprotection et stratégies thérapeutiques, University of Strasbourg, 1, rue Eugène-Boeckel - CS 60026, 67084 Strasbourg, France.
| | - J Paris
- Inserm U1064, CR2TI - Center for Research in Transplantation and Translational Immunology, Nantes University, 44000 Nantes, France
| | - I Faddeenkov
- Inserm U1064, CR2TI - Center for Research in Transplantation and Translational Immunology, Nantes University, 44000 Nantes, France
| | - J De Sèze
- Inserm U1119 : biopathologie de la myéline, neuroprotection et stratégies thérapeutiques, University of Strasbourg, 1, rue Eugène-Boeckel - CS 60026, 67084 Strasbourg, France; Department of Neurology, University Hospital of Strasbourg, 1, avenue Molière, 67200 Strasbourg, France; Inserm CIC 1434 Clinical Investigation Center, University Hospital of Strasbourg, 1, avenue Molière, 67200 Strasbourg, France
| | - P-A Gourraud
- Inserm U1064, CR2TI - Center for Research in Transplantation and Translational Immunology, Nantes University, 44000 Nantes, France; "Data clinic", Department of Public Health, University Hospital of Nantes, Nantes, France
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Soldwedel S, Demuth S, Schildgen O. T84 Monolayer Cell Cultures Support Productive HBoV and HSV-1 Replication and Enable In Vitro Co-Infection Studies. Viruses 2024; 16:773. [PMID: 38793654 DOI: 10.3390/v16050773] [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: 04/24/2024] [Revised: 05/07/2024] [Accepted: 05/09/2024] [Indexed: 05/26/2024] Open
Abstract
Based on several clinical observations it was hypothesized that herpesviruses may influence the replication of human bocaviruses, the second known parvoviruses that have been confirmed as human pathogens. While several cell lines support the growth of HSV-1, HBoV-1 was exclusively cultivated on air-liquid interface cultures, the latter being a rather complicated, slow, and low throughput system. One of the cell lines are T84 cells, which are derived from the lung metastasis of a colorectal tumor. In this study, we provide evidence that T84 also supports HBoV replication when cultivated as monolayers, while simultaneously being permissive for HSV-1. The cell culture model thus would enable co-infection studies of both viruses and is worth being optimized for high throughput studies with HBoV-1. Additionally, the study provides evidence for a supporting effect of HSV-1 on the replication and packaging of HBoV-1 progeny DNA into DNase-resistant viral particles.
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Affiliation(s)
- Swen Soldwedel
- Kliniken der Stadt Köln, Institut für Pathologie, 51109 Köln/Cologne, Germany
| | - Sabrina Demuth
- Kliniken der Stadt Köln, Institut für Pathologie, 51109 Köln/Cologne, Germany
| | - Oliver Schildgen
- Institut für Pathologie, Klinikum der Privaten Universität Witten/Herdecke, Ostmerheimer Str. 200, 51109 Köln/Cologne, Germany
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Bogdan T, El Ghannudi S, Demuth S, Kremer L, De Seze J, Bigaut K. Reverse Takotsubo cardiomyopathy as a complication of MOG-antibody-associated disease (MOGAD)? A case report. Rev Neurol (Paris) 2022; 178:981-983. [DOI: 10.1016/j.neurol.2022.06.013] [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] [Received: 02/18/2022] [Revised: 05/26/2022] [Accepted: 06/08/2022] [Indexed: 11/06/2022]
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Wanney J, Lüsebrink J, Spölgen G, Demuth S, Schildgen V, Schildgen O. Direct comparison of Altona-SARS-CoV-2 dual target RT-qPCR assay with commercial LAMP assay using throat washes in health care staff testing. J Clin Virol Plus 2022; 2:100088. [PMID: 35669098 PMCID: PMC9159961 DOI: 10.1016/j.jcvp.2022.100088] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2022] [Revised: 05/24/2022] [Accepted: 06/01/2022] [Indexed: 11/30/2022] Open
Abstract
Background Rapid molecular diagnostics by PCR has a crucial role in handling the global SARS-CoV-2 pandemic. As diagnoses are time-sensitive and global supply chains are susceptible to various factors alternative detection methods would be an important backup. Objectives During the study the performance of a commercially available isothermal LAMP method for SARS-CoV-2 detection was compared to a IVD RT-PCR Assays using throat wash specimens that were routinely taken in our hospital setting. Study design Throat wash specimens of hospital staff (n = 174) previously tested positive for SARS-CoV-2 by the Altona Diagnostics RealStar SARS-CoV-2 RT-PCR (Altona Diagnostics, Hamburg, Germany) was tested for SARS-CoV-2 also by the SARS-CoV-2 Rapid Colorimetric LAMP Assay (NEB Germany GmbH, Frankfurt a.M., Germany). Results The sensitivity of the colorimetric LAMP Assay compared to RT-qPCR was 78.74%, and the specificity was determined to 88.24% with a positive predictive value of 0.986 and a negative predicitve value of 0.882. The positive and negative likelihood ratio for LAMP was 6.693 and 0.241, respectively, while the diagnostic odds ratio was 27.77. Conclusions In times of limited PCR test ressources and in settings with limited PCR capacities, the colorimetric LAMP Assay could serve as an alternative, if a calculable loss of sensitivity is acceptable from the Public Health perspective in certain settings.
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Affiliation(s)
- Johannes Wanney
- Institut für Pathologie, Kliniken der Stadt Köln gGmbH, Klinikum der Privaten Universität Witten/Herdecke, Ostmerheimer Str. 200, D-51109 Cologne, Germany
| | - Jessica Lüsebrink
- Institut für Pathologie, Kliniken der Stadt Köln gGmbH, Klinikum der Privaten Universität Witten/Herdecke, Ostmerheimer Str. 200, D-51109 Cologne, Germany
| | - Gina Spölgen
- Institut für Pathologie, Kliniken der Stadt Köln gGmbH, Klinikum der Privaten Universität Witten/Herdecke, Ostmerheimer Str. 200, D-51109 Cologne, Germany
| | - Sabrina Demuth
- Institut für Pathologie, Kliniken der Stadt Köln gGmbH, Klinikum der Privaten Universität Witten/Herdecke, Ostmerheimer Str. 200, D-51109 Cologne, Germany
| | - Verena Schildgen
- Institut für Pathologie, Kliniken der Stadt Köln gGmbH, Klinikum der Privaten Universität Witten/Herdecke, Ostmerheimer Str. 200, D-51109 Cologne, Germany
| | - Oliver Schildgen
- Institut für Pathologie, Kliniken der Stadt Köln gGmbH, Klinikum der Privaten Universität Witten/Herdecke, Ostmerheimer Str. 200, D-51109 Cologne, Germany
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Kummer D, Steinbacher T, Thölmann S, Schwietzer MF, Hartmann C, Horenkamp S, Demuth S, Peddibhotla SS, Brinkmann F, Kemper B, Schnekenburger J, Brandt M, Betz T, Liashkovich I, Kouzel IU, Shahin V, Corvaia N, Rottner K, Tarbashevich K, Raz E, Greune L, Schmidt MA, Gerke V, Ebnet K. A JAM-A-tetraspanin-αvβ5 integrin complex regulates contact inhibition of locomotion. J Biophys Biochem Cytol 2022; 221:213070. [PMID: 35293964 PMCID: PMC8931538 DOI: 10.1083/jcb.202105147] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [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: 05/25/2021] [Revised: 12/16/2021] [Accepted: 01/21/2022] [Indexed: 12/30/2022] Open
Abstract
Contact inhibition of locomotion (CIL) is a process that regulates cell motility upon collision with other cells. Improper regulation of CIL has been implicated in cancer cell dissemination. Here, we identify the cell adhesion molecule JAM-A as a central regulator of CIL in tumor cells. JAM-A is part of a multimolecular signaling complex in which tetraspanins CD9 and CD81 link JAM-A to αvβ5 integrin. JAM-A binds Csk and inhibits the activity of αvβ5 integrin-associated Src. Loss of JAM-A results in increased activities of downstream effectors of Src, including Erk1/2, Abi1, and paxillin, as well as increased activity of Rac1 at cell-cell contact sites. As a consequence, JAM-A-depleted cells show increased motility, have a higher cell-matrix turnover, and fail to halt migration when colliding with other cells. We also find that proper regulation of CIL depends on αvβ5 integrin engagement. Our findings identify a molecular mechanism that regulates CIL in tumor cells and have implications on tumor cell dissemination.
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Affiliation(s)
- Daniel Kummer
- Institute-associated Research Group “Cell Adhesion and Cell Polarity”, Münster, Germany,Institute of Medical Biochemistry, ZMBE, University of Münster, Münster, Germany,Interdisciplinary Clinical Research Center (IZKF), University of Münster, Münster, Germany
| | - Tim Steinbacher
- Institute-associated Research Group “Cell Adhesion and Cell Polarity”, Münster, Germany,Institute of Medical Biochemistry, ZMBE, University of Münster, Münster, Germany
| | - Sonja Thölmann
- Institute-associated Research Group “Cell Adhesion and Cell Polarity”, Münster, Germany,Institute of Medical Biochemistry, ZMBE, University of Münster, Münster, Germany
| | - Mariel Flavia Schwietzer
- Institute-associated Research Group “Cell Adhesion and Cell Polarity”, Münster, Germany,Institute of Medical Biochemistry, ZMBE, University of Münster, Münster, Germany
| | - Christian Hartmann
- Institute-associated Research Group “Cell Adhesion and Cell Polarity”, Münster, Germany,Institute of Medical Biochemistry, ZMBE, University of Münster, Münster, Germany
| | - Simone Horenkamp
- Institute-associated Research Group “Cell Adhesion and Cell Polarity”, Münster, Germany,Institute of Medical Biochemistry, ZMBE, University of Münster, Münster, Germany
| | - Sabrina Demuth
- Institute-associated Research Group “Cell Adhesion and Cell Polarity”, Münster, Germany,Institute of Medical Biochemistry, ZMBE, University of Münster, Münster, Germany
| | - Swetha S.D. Peddibhotla
- Institute-associated Research Group “Cell Adhesion and Cell Polarity”, Münster, Germany,Institute of Medical Biochemistry, ZMBE, University of Münster, Münster, Germany
| | - Frauke Brinkmann
- Institute-associated Research Group “Cell Adhesion and Cell Polarity”, Münster, Germany,Institute of Medical Biochemistry, ZMBE, University of Münster, Münster, Germany
| | - Björn Kemper
- Biomedical Technology Center, Medical Faculty, University of Münster, Münster, Germany
| | - Jürgen Schnekenburger
- Biomedical Technology Center, Medical Faculty, University of Münster, Münster, Germany
| | - Matthias Brandt
- Institute-associated Research Group “Mechanics of Cellular Systems”, Institute of Cell Biology, ZMBE, University of Münster, Münster, Germany
| | - Timo Betz
- Institute-associated Research Group “Mechanics of Cellular Systems”, Institute of Cell Biology, ZMBE, University of Münster, Münster, Germany
| | - Ivan Liashkovich
- Institute of Physiology II, University of Münster, Münster, Germany
| | - Ivan U. Kouzel
- Sars International Centre for Marine Molecular Biology University of Bergen Thormøhlensgt, Bergen, Norway
| | - Victor Shahin
- Institute of Physiology II, University of Münster, Münster, Germany
| | - Nathalie Corvaia
- Centre d’Immunologie Pierre Fabre (CIPF), Saint-Julien-en-Genevois, France
| | - Klemens Rottner
- Divison of Molecular Cell Biology, Zoological Institute, Technical University Braunschweig, Braunschweig, Germany,Molecular Cell Biology Group, Department of Cell Biology, Helmholtz Centre for Infection Research, Braunschweig, Germany
| | | | - Erez Raz
- Institute of Cell Biology, ZMBE, University of Münster, Münster, Germany,Cells-in-Motion Cluster of Excellence (EXC 1003—CiM), University of Münster, 48419 Münster, Germany
| | - Lilo Greune
- Institute of Infectiology, ZMBE, University of Münster, Münster, Germany
| | | | - Volker Gerke
- Institute of Medical Biochemistry, ZMBE, University of Münster, Münster, Germany,Cells-in-Motion Cluster of Excellence (EXC 1003—CiM), University of Münster, 48419 Münster, Germany
| | - Klaus Ebnet
- Institute-associated Research Group “Cell Adhesion and Cell Polarity”, Münster, Germany,Institute of Medical Biochemistry, ZMBE, University of Münster, Münster, Germany,Interdisciplinary Clinical Research Center (IZKF), University of Münster, Münster, Germany,Cells-in-Motion Cluster of Excellence (EXC 1003—CiM), University of Münster, 48419 Münster, Germany
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Demuth S, Damaschek S, Schildgen O, Schildgen V. Low sensitivity of SARS-CoV-2 rapid antigen self-tests under laboratory conditions. New Microbes New Infect 2021; 43:100916. [PMID: 34277011 PMCID: PMC8276565 DOI: 10.1016/j.nmni.2021.100916] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2021] [Revised: 06/24/2021] [Accepted: 07/05/2021] [Indexed: 12/01/2022] Open
Abstract
SARS-CoV-2-antigen-testing has been proposed as a ‘game-changing’ tool to interrupt infection chains. Thereby European strategies focused on two pillars, namely rapid antigen tests conducted by health care experts and/or trained personal and so-called self-tests. Here, evidence is provided that these assays have a weak performance even under laboratory conditions.
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Affiliation(s)
- S Demuth
- Kliniken der Stadt Köln, Institut für Pathologie, Klinikum der Privaten Universität Witten Herdecke mit Sitz in Köln, Ostmerheimer Str. 200, D-51109, Cologne, Germany
| | - S Damaschek
- Kliniken der Stadt Köln, Institut für Pathologie, Klinikum der Privaten Universität Witten Herdecke mit Sitz in Köln, Ostmerheimer Str. 200, D-51109, Cologne, Germany
| | - O Schildgen
- Kliniken der Stadt Köln, Institut für Pathologie, Klinikum der Privaten Universität Witten Herdecke mit Sitz in Köln, Ostmerheimer Str. 200, D-51109, Cologne, Germany
| | - V Schildgen
- Kliniken der Stadt Köln, Institut für Pathologie, Klinikum der Privaten Universität Witten Herdecke mit Sitz in Köln, Ostmerheimer Str. 200, D-51109, Cologne, Germany
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Hsu L, Wisplinghoff H, Kossow A, Hurraß J, Wiesmüller GA, Grüne B, Hoffmann D, Lüsebrink J, Demuth S, Schildgen O, Schildgen V. Limited protection against SARS-CoV-2 infection and virus transmission after mRNA vaccination. J Infect 2021; 84:94-118. [PMID: 34214517 PMCID: PMC8240461 DOI: 10.1016/j.jinf.2021.06.023] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2021] [Accepted: 06/25/2021] [Indexed: 11/19/2022]
Affiliation(s)
- Lea Hsu
- Gesundheitsamt der Stadt Köln, Infektions- und Umwelthygiene, Neumarkt 15- 21, Köln 50667, Germany
| | - Hilmar Wisplinghoff
- LaborDr.Wisplinghoff, Horbeller Str. 20, Köln 50858, Germany; InstitutfürVirologie und Mikrobiologie, Universität Witten/Herdecke, StockumerStr. 10, Witten 58453, Germany
| | - Annelene Kossow
- Gesundheitsamt der Stadt Köln, Infektions- und Umwelthygiene, Neumarkt 15- 21, Köln 50667, Germany; Institute of Hygiene, University Hospital Muenster, Germany
| | - Julia Hurraß
- Gesundheitsamt der Stadt Köln, Infektions- und Umwelthygiene, Neumarkt 15- 21, Köln 50667, Germany
| | - Gerhard A Wiesmüller
- Gesundheitsamt der Stadt Köln, Infektions- und Umwelthygiene, Neumarkt 15- 21, Köln 50667, Germany
| | - Barbara Grüne
- Gesundheitsamt der Stadt Köln, Infektions- und Umwelthygiene, Neumarkt 15- 21, Köln 50667, Germany
| | - Dennis Hoffmann
- LaborDr.Wisplinghoff, Horbeller Str. 20, Köln 50858, Germany
| | - Jessica Lüsebrink
- Klinikum der PrivatenUniversität Witten/Herdecke, InstitutfürPathologie, Ostmerheimer Str. 200, Köln (Cologne) D-51109, Germany
| | - Sabrina Demuth
- Klinikum der PrivatenUniversität Witten/Herdecke, InstitutfürPathologie, Ostmerheimer Str. 200, Köln (Cologne) D-51109, Germany
| | - Oliver Schildgen
- InstitutfürVirologie und Mikrobiologie, Universität Witten/Herdecke, StockumerStr. 10, Witten 58453, Germany; Klinikum der PrivatenUniversität Witten/Herdecke, InstitutfürPathologie, Ostmerheimer Str. 200, Köln (Cologne) D-51109, Germany
| | - Verena Schildgen
- Klinikum der PrivatenUniversität Witten/Herdecke, InstitutfürPathologie, Ostmerheimer Str. 200, Köln (Cologne) D-51109, Germany.
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Schildgen V, Demuth S, Lüsebrink J, Schildgen O. Limits and Opportunities of SARS-CoV-2 Antigen Rapid Tests: An Experienced-Based Perspective. Pathogens 2021; 10:pathogens10010038. [PMID: 33466537 PMCID: PMC7824818 DOI: 10.3390/pathogens10010038] [Citation(s) in RCA: 45] [Impact Index Per Article: 15.0] [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: 12/10/2020] [Revised: 12/28/2020] [Accepted: 01/04/2021] [Indexed: 12/04/2022] Open
Abstract
Background: Due to the steadily rising case numbers of SARS-CoV-2 infections worldwide, there is an increasing need for reliable rapid diagnostic devices in addition to existing gold standard PCR methods. Actually, public attention is focused on antigen assays including lateral flow tests (LFTs) as a diagnostic alternative. Therefore, different LFTs were analyzed regarding their performance in a clinical setting. Material and Methods: A pilot sample panel of 13 bronchoalveolar fluids (BALFs) and 60 throat washing (TW) samples with confirmed PCR results, as well as eight throat washes invalid by PCR, were tested with the BIOCREDIT test (RapiGEN), the PanbioTM assay (Abbott), and the SARS-CoV-2 rapid antigen test (Roche). Conclusion: The analyzed antigen test showed an interassay correlation of 27.4%, with overall specificities ranging from 19.4% to 87.1%, while sensitivities of the respective tests ranged between 33.3% and 88.1%. Because these assays did not entirely meet all high expectations, their benefit has to be carefully evaluated for the respective test strategy and setting.
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Demuth S, Courtois S, Cohen E, Goudot M. Acute dysautonomia and erythromelalgia associated with testicular seminoma: A case report. Rev Neurol (Paris) 2020; 177:146-147. [PMID: 32631673 DOI: 10.1016/j.neurol.2020.03.025] [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] [Received: 11/11/2019] [Revised: 03/29/2020] [Accepted: 03/30/2020] [Indexed: 11/26/2022]
Affiliation(s)
- S Demuth
- Service de Neurologie, groupe hospitalier de la région sud Alsace, 20 Avenue du Dr René Laennec, 68100 Mulhouse, France.
| | - S Courtois
- Service de Neurologie, groupe hospitalier de la région sud Alsace, 20 Avenue du Dr René Laennec, 68100 Mulhouse, France.
| | - E Cohen
- Service de Neurologie, groupe hospitalier de la région sud Alsace, 20 Avenue du Dr René Laennec, 68100 Mulhouse, France.
| | - M Goudot
- Service de Neurologie, groupe hospitalier de la région sud Alsace, 20 Avenue du Dr René Laennec, 68100 Mulhouse, France.
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Schossleitner K, O'Mahony C, Brandstätter S, Haslinger MJ, Demuth S, Fechtig D, Petzelbauer P. Differences in biocompatibility of microneedles from cyclic olefin polymers with human endothelial and epithelial skin cells. J Biomed Mater Res A 2018; 107:505-512. [PMID: 30456923 PMCID: PMC6587957 DOI: 10.1002/jbm.a.36565] [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] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2018] [Revised: 09/20/2018] [Accepted: 09/28/2018] [Indexed: 01/05/2023]
Abstract
Microneedles are promising devices for transdermal delivery and diagnostic applications, due to their minimally invasive and painless nature of application. However, so far, applications are limited to small scale research projects. Material selection and production for larger projects remain a challenge. In vitro testing using human cell culture could bridge the gap between cost effective screening of suitable materials and concerns for safety and ethics. In this study, materials were tested for effects on viability and morphology of human endothelial cells and keratinocytes. In addition, materials were assessed for their potential to influence cellular differentiation and barrier formation. Elution‐based testing of inflammatory markers revealed no negative effects in all applied tests, whereas the assessment of differentiation markers on cells in direct contact with the material showed differences and allowed the selection of candidate materials for future medical device applications. This study illustrates that elution‐based biocompatibility testing can paint an incomplete picture. Advanced staining techniques and cell types specific for the application of the medical device improve material selection to reduce and replace animal testing at an early stage in the development process. © 2018 The Authors. journal Of Biomedical Materials Research Part A Published By Wiley Periodicals, Inc. J Biomed Mater Res Part A: 107A: 505–512, 2019.
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Affiliation(s)
- Klaudia Schossleitner
- Skin and Endothelium Research Division, Department of Dermatology, Medical University Vienna, Vienna, Austria
| | - Conor O'Mahony
- Tyndall National Institute, University College Cork, Cork, T12 R5CP, Ireland
| | | | - Michael J Haslinger
- Functional Surfaces and Nanostructures, Profactor GmbH, Steyr-Gleink, Austria
| | - Sabrina Demuth
- Skin and Endothelium Research Division, Department of Dermatology, Medical University Vienna, Vienna, Austria
| | - Daniel Fechtig
- Functional Surfaces and Nanostructures, Profactor GmbH, Steyr-Gleink, Austria
| | - Peter Petzelbauer
- Skin and Endothelium Research Division, Department of Dermatology, Medical University Vienna, Vienna, Austria
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Weidensee S, Demuth S, Schleussner E. P-030 Lipoprotein (a) as a thrombophilic risk factor for recurrent pregnancy loss. Thromb Res 2013. [DOI: 10.1016/s0049-3848(13)70076-8] [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: 11/30/2022]
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Weidensee S, Demuth S, Schleußner E. Häufigkeit von erhöhten Lipoprotein(a)- Lp(a)-Spiegeln in einem ausgewählten Patientenkollektiv mit habituellen Aborten und Spätaborten. Z Geburtshilfe Neonatol 2012. [DOI: 10.1055/s-0032-1309129] [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: 10/28/2022]
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Bittrich HJ, Weidensee S, Braun L, Demuth S, Bohne K, Sauerbrey A. Myotone Dystrophie, intrafamiliäre Schweregradzunahme korreliert mit Repeatexpansion der CTG-Region des DMPK1-Gens – Fallbericht aus 1 Familie. Z Geburtshilfe Neonatol 2007. [DOI: 10.1055/s-2007-1003006] [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: 10/21/2022]
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Heinritz W, Moschik A, Kujat A, Spranger S, Heilbronner H, Demuth S, Bier A, Tihanyi M, Mundlos S, Gruenauer-Kloevekorn C, Froster UG. Identification of new mutations in the TBX5 gene in patients with Holt-Oram syndrome. Heart 2005; 91:383-4. [PMID: 15710732 PMCID: PMC1768780 DOI: 10.1136/hrt.2004.036855] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [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: 11/04/2022] Open
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Gillessen-Kaesbach G, Demuth S, Thiele H, Theile U, Lich C, Horsthemke B. A previously unrecognised phenotype characterised by obesity, muscular hypotonia, and ability to speak in patients with Angelman syndrome caused by an imprinting defect. Eur J Hum Genet 1999; 7:638-44. [PMID: 10482951 DOI: 10.1038/sj.ejhg.5200362] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.5] [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: 11/09/2022] Open
Abstract
The clinical features of Angelman syndrome (AS) comprise severe mental retardation, postnatal microcephaly, macrostomia and prognathia, absence of speech, ataxia, and a happy disposition. We report on seven patients who lack most of these features, but presented with obesity, muscular hypotonia and mild mental retardation. Based on the latter findings, the patients were initially suspected of having Prader-Willi syndrome. DNA methylation analysis of SNRPN and D15S63, however, revealed an AS pattern, ie the maternal band was faint or absent. Cytogenetic studies and microsatellite analysis demonstrated apparently normal chromosomes 15 of biparental inheritance. We conclude that these patients have an imprinting defect and a previously unrecognised form of AS. The mild phenotype may be explained by an incomplete imprinting defect or by cellular mosaicism.
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16
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Chudoba I, Franke Y, Senger G, Sauerbrei G, Demuth S, Beensen V, Neumann A, Hansmann I, Claussen U. Maternal UPD 20 in a hyperactive child with severe growth retardation. Eur J Hum Genet 1999; 7:533-40. [PMID: 10439958 DOI: 10.1038/sj.ejhg.5200287] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.8] [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: 11/08/2022] Open
Abstract
Maternal uniparental disomy was observed in a 4-year-old boy with severe pre- and postnatal growth retardation (body height: 85 cm = 12 cm < third percentile, head circumference: 48 cm = 10 cm < third percentile), a few minor facial findings, and with apparent hyperactivity. His intelligence is within the normal range for his age. Karyotype analysis revealed two cell lines, one apparently normal with 46,XY, the other with a tiny marker (47,XY, + mar). Microdissection and reverse chromosome painting using the marker DNA library as a probe, as well as PCR analysis revealed that the marker is from chromosome 20 and contains only the centromere and pericentromeric segments, but none of the pericentromeric loci for microsatellites. Microsatellite analysis of 25 chromosome 20 loci disclosed maternal uniparental disomy for all 16 informative markers. Maternal heterodisomy was evident for seven loci of the short arm segment 20p11.2-pter. Maternal isodisomy was found at five loci, three of them map to the proximal 20p11.2 segment and two to 20q. To our knowledge, this is the first case of maternal disomy 20 in humans.
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Affiliation(s)
- I Chudoba
- Institute of Human Genetics and Anthropology, Friedrich-Schiller-University, Jena, Germany
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17
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Abstract
Based on the previous findings that the number of olfactory projection neurons increases continuously in adult shore crabs, Carcinus maenas, and that this increase is associated with the presence of 5-bromo-2-deoxyuridine (BrdU)-positive, proliferating cells in the appropriate soma clusters (lateral soma clusters), we studied the further fate of these proliferating cells and the presence of apparent adult neurogenesis throughout the central olfactory pathway of diverse species of decapod crustaceans. Double labeling experiments combining biocytin-backfills and in vivo BrdU labeling as well as BrdU labeling with extended survival times (1 month) indicate that the cells proliferating in the lateral soma clusters of adult Carcinus undergo neuronal differentiation in about 3-4 weeks. In vivo BrdU labeling of different species representing important taxa of decapod crustaceans (shrimps, spiny lobsters, clawed lobsters, crayfish) revealed that neurogenesis among olfactory projection neurons is a constitutive feature of the adult decapod brain. In contrast, adult neurogenesis of the other neuron types present in the central olfactory pathway occurs in a taxon-specific manner and appears to be related to the development and reduction of accessory lobes throughout decapod phylogeny.
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Affiliation(s)
- M Schmidt
- Zooligisches Institut, Universität Hamburg, Germany.
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18
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Abstract
Carrier determination is important for genetic counselling in DMD/BMD families. The detection of altered PCR amplified dystrophin mRNA fragments owing to deletions, insertions, or point mutations has increased the possibilities of carrier determination. However, problems may occur because of alternative splicing events. Here we present a family with a DMD patient characterised by a deletion of exons 45 to 54. At the mRNA level we detected a corresponding altered fragment which served for carrier determination. The mother and the sister of the patient showed the same altered dystrophin mRNA fragment as the patient and are therefore carriers. In the mother two additional altered dystrophin mRNA fragments were detectable, obviously resulting from alternative splicing in the normal allele. The grandmother and two other related females of the patient possess only the normal mRNA fragment. In a further female we detected an altered fragment owing to an mRNA deletion of exon 44. This fragment is created either by alternative splicing or a new mutation. Therefore, the carrier status of this female is still ambiguous indicating problems in carrier determination by the method of dystrophin mRNA analysis.
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Affiliation(s)
- U Lenk
- Max Delbrück Centre for Molecular Medicine, Berlin-Buch, Germany
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19
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Demuth S, August C. [Familial juvenile nephronophthisis--a genetically-caused kidney disease]. Z Urol Nephrol 1990; 83:505-9. [PMID: 2267862] [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] [Indexed: 12/31/2022]
Abstract
It is reported on the course of the autosomal recessive transmitted familiar juvenile nephronophthisis in 3 siblings. Direct symptoms are polydipsia and polyuria with terminal course of chronic renal failure which could treated by dialysis and transplantation. Examination of the safe (parents) and possible (healthy siblings) heterozygotes was without particularities.
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Affiliation(s)
- S Demuth
- Humangenetische Beratungsstelle des Bezirkes Halle am Stadtkrankenhaus Halle
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20
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Utsugi T, Demuth S, Hanna N. Synergistic antitumor effects of topoisomerase inhibitors and natural cell-mediated cytotoxicity. Cancer Res 1989; 49:1429-33. [PMID: 2538225] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The mechanism of augmentation of tumor cell killing by immune effector cells and chemotherapeutic drugs was studied. The effect of treating tumor cells with various antineoplastic drugs on their sensitivity to murine natural cell-mediated cytotoxicity in vitro was investigated. Pretreatment with actinomycin D at nontoxic concentrations rendered L929 and WEHI-164 tumor cells more susceptible to killing by mouse spleen lymphocytes in a dose-dependent manner. Similarly, enhancement of L929 tumor cell killing by natural cell-mediated cytotoxicity was observed following treatment of the target cells with the topoisomerase II inhibitors, Adriamycin, amsacrine, bisantrene, etoposide, and teniposide, as well as with topoisomerase I inhibitor, camptothecin. In contrast, drugs which induce their cytotoxic effects by mechanisms that do not involve topoisomerase inhibition such as bleomycin, vinblastine, vincristine, and mitomycin C failed to exhibit synergism with natural cell-mediated cytotoxicity. However, moderate synergy was consistently observed with cis-platinum. The effector cells responsible for the cytotoxicity in the present system are natural cytotoxic cells since they kill WEHI-164 but not YAC cells, are resistant to treatment with anti-asialo-GM1 antibody, and their activity is abolished by anti-tumor necrosis factor antibodies. Indeed, tumor necrosis factor-mediated cytotoxicity of WEHI-164 or L929 was enhanced by treatment of the target cells with topoisomerase II inhibitors. Moreover, WEHI-164 cells selected for tumor necrosis factor resistance were resistant to natural cell-mediated cytotoxicity, and no synergy could be observed with topoisomerase inhibitors.
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Affiliation(s)
- T Utsugi
- Department of Immunology, Smith Kline & French Laboratories, King of Prussia, Pennsylvania 19406-0939
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21
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Lee JC, Rebar L, Demuth S, Hanna N. Suppressed IL-2 production and response in AA rats: role of suppressor cells and the effect of auranofin treatment. J Rheumatol 1985; 12:885-91. [PMID: 2935633] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The marked suppression of mitogenic responses to concanavalin A observed in adjuvant arthritic (AA) rats during the development and progression of the clinical disease is mediated primarily by splenic adherent cell population. The suppressed mitogenic response of spleen cells from AA rats was in part due to suppressed production of and response to interleukin 2 (IL-2). Unfractionated spleen cells from AA rats did not produce or respond to IL-2. However, IL-2 production and response were normalized after removal of adherent cells. Reconstitution experiments demonstrated that adherent cells from AA rats suppressed both the mitogenic response and IL-2 production by normal spleen cells. The low IL-2 levels was not a result of degradation or consumption of endogenously produced interleukin. In vitro treatment of suppressor adherent cells from AA rats with micromolar concentrations of auranofin (AF), but not gold sodium thiomalate, totally abolished the suppression of both mitogenesis and IL-2 production. Our studies demonstrate that the suppressed lymphocyte mitogenic responses, IL-2 response and IL-2 production of AA rat spleen cells are due to the presence of suppressor adherent cells, and that treatment with AF inhibited suppressor cell activity and restored to normal levels lymphocyte mitogenic responses and IL-2 production.
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Hursh JB, Greenwood MR, Clarkson TW, Allen J, Demuth S. The effect of ethanol on the fate of mercury vapor inhaled by man. J Pharmacol Exp Ther 1980; 214:520-7. [PMID: 7400960] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
Three human subjects ingested 1065 ml of beer equivalent to 65 ml of ethanol 30 min before exposure (12-20 min) to mercury vapor. An additional two subjects were exposed to mercury vapor without ethanol pretreatment. The results show that alcohol brings about: 1) reduced mercury retention, 2) an increase in the rapid phase of vapor loss by expiration, 3) an increased mercury storage in the liver, 4) a marked reduction in mercury uptake by the red blood cells and 5) the abolition of vapor exposure experiments were performed by using control and ethanol-pretreated mice and rats. Sacrifice occurred at 1 hr and 3 days. The results support and extend the human data.
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Hunt CE, Matalon SV, Thompson TR, Demuth S, Loew JM, Liu HM, Mastri A, Burke B. Central hypoventilation syndrome: experience with bilateral phrenic nerve pacing in 3 neonates. Am Rev Respir Dis 1978; 118:23-8. [PMID: 354443 DOI: 10.1164/arrd.1978.118.1.23] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Successful long-term phrenic nerve pacing has been reported in adults with acquired central hypoventilation syndrome. This report summarizes our experience with phrenic nerve pacing in 3 infants with congenital central hypoventilation syndrome. The electrodes were implanted in the lower thoracic portion of each phrenic nerve. In all patients. bilateral simultaneous pacing was required to maintain an adequate arterial PO2, tidal volume, and minute ventilation during quiet sleep. Case 1 died of problems primarily related to the severe cor pulmonale that had been present before pacemaker insertion; at autopsy, the pacemaker system was intact and there were no significant phrenic nerve abnormalities. Case 2 later developed failure of awake ventilatory control and died because of extensive phrenic nerve damage incurred by 19 days of continuous pacing. Case 3 has received quiet sleep pacemaker support since September 1977 and has been able to maintain normal quiet sleep ventilation in this manner. Phrenic nerve pacing can be successful in infants as long as continuous pacing is not required. Bilateral simultaneous pacing appears to be an appropriate alternative to home-based intermittent positive-pressure breathing for long-term management of children with central hypoventilation syndrome.
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