1
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Gu Y, Shunmuganathan B, Qian X, Gupta R, Tan RSW, Kozma M, Purushotorman K, Murali TM, Tan NYJ, Preiser PR, Lescar J, Nasir H, Somani J, Tambyah PA, Smith KGC, Renia L, Ng LFP, Lye DC, Young BE, MacAry PA. Employment of a high throughput functional assay to define the critical factors that influence vaccine induced cross-variant neutralizing antibodies for SARS-CoV-2. Sci Rep 2023; 13:21810. [PMID: 38071323 PMCID: PMC10710454 DOI: 10.1038/s41598-023-49231-w] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2023] [Accepted: 12/06/2023] [Indexed: 12/18/2023] Open
Abstract
The scale and duration of neutralizing antibody responses targeting SARS-CoV-2 viral variants represents a critically important serological parameter that predicts protective immunity for COVID-19. In this study, we describe the development and employment of a new functional assay that measures neutralizing antibodies for SARS-CoV-2 and present longitudinal data illustrating the impact of age, sex and comorbidities on the kinetics and strength of vaccine-induced antibody responses for key variants in an Asian volunteer cohort. We also present an accurate quantitation of serological responses for SARS-CoV-2 that exploits a unique set of in-house, recombinant human monoclonal antibodies targeting the viral Spike and nucleocapsid proteins and demonstrate a reduction in neutralizing antibody titres across all groups 6 months post-vaccination. We also observe a marked reduction in the serological binding activity and neutralizing responses targeting recently newly emerged Omicron variants including XBB 1.5 and highlight a significant increase in cross-protective neutralizing antibody responses following a third dose (boost) of vaccine. These data illustrate how key virological factors such as immune escape mutations combined with host demographic factors such as age and sex of the vaccinated individual influence the strength and duration of cross-protective serological immunity for COVID-19.
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Affiliation(s)
- Yue Gu
- Antibody Engineering Programme, Life Sciences Institute, National University of Singapore, Singapore, Singapore
- Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
- NUH-Cambridge Immune Phenotyping Centre, National University of Singapore, Singapore, Singapore
| | - Bhuvaneshwari Shunmuganathan
- Antibody Engineering Programme, Life Sciences Institute, National University of Singapore, Singapore, Singapore
- Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Xinlei Qian
- Antibody Engineering Programme, Life Sciences Institute, National University of Singapore, Singapore, Singapore
- Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Rashi Gupta
- Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Rebecca S W Tan
- Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Mary Kozma
- Antibody Engineering Programme, Life Sciences Institute, National University of Singapore, Singapore, Singapore
| | - Kiren Purushotorman
- Antibody Engineering Programme, Life Sciences Institute, National University of Singapore, Singapore, Singapore
- Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Tanusya M Murali
- Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Nikki Y J Tan
- Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Peter R Preiser
- Antimicrobial Resistance Interdisciplinary Research Group (AMR-IRG), Singapore-MIT Alliance in Research and Technology (SMART), Singapore, 138602, Singapore
- School of Biological Science (SBS), Nanyang Technological University (NTU), 60 Nanyang Dr, Singapore, 637551, Singapore
| | - Julien Lescar
- School of Biological Science (SBS), Nanyang Technological University (NTU), 60 Nanyang Dr, Singapore, 637551, Singapore
- NTU Institute of Structural Biology, Nanyang Technological University, 59 Nanyang Drive, Singapore, 636921, Singapore
| | - Haziq Nasir
- Division of Infectious Disease, University Medicine Cluster, National University Hospital, Singapore, Singapore
| | - Jyoti Somani
- Division of Infectious Disease, University Medicine Cluster, National University Hospital, Singapore, Singapore
| | - Paul A Tambyah
- Division of Infectious Disease, University Medicine Cluster, National University Hospital, Singapore, Singapore
| | - Kenneth G C Smith
- NUH-Cambridge Immune Phenotyping Centre, National University of Singapore, Singapore, Singapore
- Cambridge Institute of Therapeutic Immunology and Infectious Disease, Jeffrey Cheah Biomedical Centre, University of Cambridge, Cambridge, CB2 0AW, UK
- Department of Medicine, University of Cambridge School of Clinical Medicine, Cambridge, CB2 0QQ, UK
| | - Laurent Renia
- A*STAR Infectious Diseases Labs, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore, Singapore
| | - Lisa F P Ng
- A*STAR Infectious Diseases Labs, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - David C Lye
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore, Singapore
- National Centre for Infectious Diseases (NCID), Singapore, Singapore
- Tan Tock Seng Hospital, Singapore, Singapore
- Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Barnaby E Young
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore, Singapore
- National Centre for Infectious Diseases (NCID), Singapore, Singapore
- Tan Tock Seng Hospital, Singapore, Singapore
| | - Paul A MacAry
- Antibody Engineering Programme, Life Sciences Institute, National University of Singapore, Singapore, Singapore.
- Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore.
- NUH-Cambridge Immune Phenotyping Centre, National University of Singapore, Singapore, Singapore.
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Krishnananthasivam S, Li H, Bouzeyen R, Shunmuganathan B, Purushotorman K, Liao X, Du F, Friis CGK, Crawshay-Williams F, Boon LH, Xinlei Q, Chan CEZ, Sobota R, Kozma M, Barcelli V, Wang G, Huang H, Floto A, Bifani P, Javid B, MacAry PA. Author Correction: An anti-LpqH human monoclonal antibody from an asymptomatic individual mediates protection against Mycobacterium tuberculosis. NPJ Vaccines 2023; 8:136. [PMID: 37749097 PMCID: PMC10520079 DOI: 10.1038/s41541-023-00735-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/27/2023] Open
Affiliation(s)
- Shivankari Krishnananthasivam
- Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Hao Li
- College of Veterinary Medicine, China Agricultural University, Beijing, China
- Center for Infectious Disease Research, School of Medicine, Tsinghua University, Beijing, China
| | - Rania Bouzeyen
- Division of Experimental Medicine, University of California, San Francisco, USA
| | | | - Kiren Purushotorman
- Life Sciences Institute, National University of Singapore, Singapore, Singapore
| | - Xinlei Liao
- National Clinical Laboratory on Tuberculosis, Beijing Tuberculosis and Thoracic Tumor Institute, Beijing Chest Hospital, Capital Medical University, Beijing, P.R. China
| | - Fengjiao Du
- National Clinical Laboratory on Tuberculosis, Beijing Tuberculosis and Thoracic Tumor Institute, Beijing Chest Hospital, Capital Medical University, Beijing, P.R. China
| | - Claudia Guldager Kring Friis
- Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Felicity Crawshay-Williams
- Molecular Immunity Unit, University of Cambridge, Department of Medicine, MRC Laboratory of Molecular Biology, Cambridge, UK
| | - Low Heng Boon
- Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Qian Xinlei
- Life Sciences Institute, National University of Singapore, Singapore, Singapore
| | - Conrad En Zuo Chan
- National Centre for Infectious Diseases, Tan Tock Seng Hospital, Singapore, Singapore
- Defence Medical and Environmental Research Institute, DSO National Laboratories, Singapore, Singapore
| | - Radoslaw Sobota
- Institute of Molecular and Cell Biology (IMCB), Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Mary Kozma
- Life Sciences Institute, National University of Singapore, Singapore, Singapore
| | - Valeria Barcelli
- Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Guirong Wang
- National Clinical Laboratory on Tuberculosis, Beijing Tuberculosis and Thoracic Tumor Institute, Beijing Chest Hospital, Capital Medical University, Beijing, P.R. China
| | - Hairong Huang
- National Clinical Laboratory on Tuberculosis, Beijing Tuberculosis and Thoracic Tumor Institute, Beijing Chest Hospital, Capital Medical University, Beijing, P.R. China
| | - Andreas Floto
- Molecular Immunity Unit, University of Cambridge, Department of Medicine, MRC Laboratory of Molecular Biology, Cambridge, UK
| | - Pablo Bifani
- Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Babak Javid
- Center for Infectious Disease Research, School of Medicine, Tsinghua University, Beijing, China.
- Division of Experimental Medicine, University of California, San Francisco, USA.
| | - Paul A MacAry
- Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore.
- Life Sciences Institute, National University of Singapore, Singapore, Singapore.
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3
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Krishnananthasivam S, Li H, Bouzeyen R, Shunmuganathan B, Purushotorman K, Liao X, Du F, Friis CGK, Crawshay-Williams F, Boon LH, Xinlei Q, Chan CEZ, Sobota R, Kozma M, Barcelli V, Wang G, Huang H, Floto A, Bifani P, Javid B, MacAry PA. An anti-LpqH human monoclonal antibody from an asymptomatic individual mediates protection against Mycobacterium tuberculosis. NPJ Vaccines 2023; 8:127. [PMID: 37626082 PMCID: PMC10457302 DOI: 10.1038/s41541-023-00710-1] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2023] [Accepted: 07/11/2023] [Indexed: 08/27/2023] Open
Abstract
Tuberculosis (TB) is an airborne disease caused by Mycobacterium tuberculosis (Mtb). Whilst a functional role for humoral immunity in Mtb protection remains poorly defined, previous studies have suggested that antibodies can contribute towards host defense. Thus, identifying the critical components in the antibody repertoires from immune, chronically exposed, healthy individuals represents an approach for identifying new determinants for natural protection. In this study, we performed a thorough analysis of the IgG/IgA memory B cell repertoire from occupationally exposed, immune volunteers. We detail the identification and selection of a human monoclonal antibody that exhibits protective activity in vivo and show that it targets a virulence factor LpqH. Intriguingly, protection in both human ex vivo and murine challenge experiments was isotype dependent, with most robust protection being mediated via IgG2 and IgA. These data have important implications for our understanding of natural mucosal immunity for Mtb and highlight a new target for future vaccine development.
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Affiliation(s)
- Shivankari Krishnananthasivam
- Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Hao Li
- College of Veterinary Medicine, China Agricultural University, Beijing, China
- Center for Infectious Disease Research, School of Medicine, Tsinghua University, Beijing, China
| | - Rania Bouzeyen
- Division of Experimental Medicine, University of California, San Francisco, USA
| | | | - Kiren Purushotorman
- Life Sciences Institute, National University of Singapore, Singapore, Singapore
| | - Xinlei Liao
- National Clinical Laboratory on Tuberculosis, Beijing Tuberculosis and Thoracic Tumor Institute, Beijing Chest Hospital, Capital Medical University, Beijing, P.R. China
| | - Fengjiao Du
- National Clinical Laboratory on Tuberculosis, Beijing Tuberculosis and Thoracic Tumor Institute, Beijing Chest Hospital, Capital Medical University, Beijing, P.R. China
| | - Claudia Guldager Kring Friis
- Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Felicity Crawshay-Williams
- Molecular Immunity Unit, University of Cambridge, Department of Medicine, MRC Laboratory of Molecular Biology, Cambridge, UK
| | - Low Heng Boon
- Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Qian Xinlei
- Life Sciences Institute, National University of Singapore, Singapore, Singapore
| | - Conrad En Zuo Chan
- National Centre for Infectious Diseases, Tan Tock Seng Hospital, Singapore, Singapore
- Defence Medical and Environmental Research Institute, DSO National Laboratories, Singapore, Singapore
| | - Radoslaw Sobota
- Institute of Molecular and Cell Biology (IMCB), Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Mary Kozma
- Life Sciences Institute, National University of Singapore, Singapore, Singapore
| | - Valeria Barcelli
- Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Guirong Wang
- National Clinical Laboratory on Tuberculosis, Beijing Tuberculosis and Thoracic Tumor Institute, Beijing Chest Hospital, Capital Medical University, Beijing, P.R. China
| | - Hairong Huang
- National Clinical Laboratory on Tuberculosis, Beijing Tuberculosis and Thoracic Tumor Institute, Beijing Chest Hospital, Capital Medical University, Beijing, P.R. China
| | - Andreas Floto
- Molecular Immunity Unit, University of Cambridge, Department of Medicine, MRC Laboratory of Molecular Biology, Cambridge, UK
| | - Pablo Bifani
- Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Babak Javid
- Center for Infectious Disease Research, School of Medicine, Tsinghua University, Beijing, China.
- Division of Experimental Medicine, University of California, San Francisco, USA.
| | - Paul A MacAry
- Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore.
- Life Sciences Institute, National University of Singapore, Singapore, Singapore.
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4
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Földi M, Csanda E, Simon M, Obál F, Schneider I, Dobranovics I, Zoltán Ö, Kozma M, Poberai M. Lymphogenic Haemangiopathy. J Vasc Res 2008. [DOI: 10.1159/000157755] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [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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5
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Felderhoff-Mueser U, Taylor DL, Greenwood K, Kozma M, Stibenz D, Joashi UC, Edwards AD, Mehmet H. Fas/CD95/APO-1 can function as a death receptor for neuronal cells in vitro and in vivo and is upregulated following cerebral hypoxic-ischemic injury to the developing rat brain. Brain Pathol 2006; 10:17-29. [PMID: 10668892 PMCID: PMC8098164 DOI: 10.1111/j.1750-3639.2000.tb00239.x] [Citation(s) in RCA: 121] [Impact Index Per Article: 6.7] [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: 11/27/2022] Open
Abstract
Fas/CD95/Apo-1 is a cell surface receptor that transduces apoptotic death signals following activation and has been implicated in triggering apoptosis in infected or damaged cells in disease states. Apoptosis is a major mechanism of neuronal loss following hypoxic-ischemic injury to the developing brain, although the role of Fas in this process has not been studied in detail. In the present study, we have investigated the expression and function of Fas in neuronal cells in vitro and in vivo. Fas was found to be expressed in the 14 day old rat brain, with strongest expression in the cortex, hippocampus and cerebellum. Cross-linking of Fas induced neuronal apoptosis both in neuronal PC12 cells in culture and following intracerebral injection in vivo, indicating that neuronal Fas was functional as a death receptor. This death was shown to be caspase dependent in primary neuronal cultures and was blocked by the selective caspase 8 inhibitor IETD. Finally, cerebral hypoxia-ischemia resulted in a strong lateralised upregulation of Fas in the hippocampus, that peaked six to twelve hours after the insult and was greater on the side of injury. These results suggest that Fas may be involved in neuronal apoptosis following hypoxic-ischemic injury to the developing brain.
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Affiliation(s)
- U Felderhoff-Mueser
- Division of Paediatrics, Obstetrics and Gynaecology, Imperial College of Science, Technology and Medicine, Hammersmith Hospital, London, UK
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6
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Jouvet P, Kozma M, Mehmet H. Primary human fibroblasts from a maple syrup urine disease patient undergo apoptosis following exposure to physiological concentrations of branched chain amino acids. Ann N Y Acad Sci 2001; 926:116-21. [PMID: 11193026 DOI: 10.1111/j.1749-6632.2000.tb05604.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [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: 11/27/2022]
Abstract
Maple syrup urine disease (MSUD) is an inborn error of metabolism caused by a deficiency in branched chain alpha-ketoacid dehydrogenase. We have recently found that MSUD neurodegeneration may result, at least in part, from apoptosis triggered by branched chain amino acids and their alpha-ketoacid derivatives. In the present study, we investigated the sensitivity of MSUD fibroblasts to defined mixtures of MSUD metabolites. Defined combinations of MSUD metabolites, at levels comparable to those in MSUD patients, triggered cell death in skin fibroblasts from a MSUD patient, while control fibroblasts were resistant. The mechanism of cell death was confirmed as apoptosis by in situ end labeling.
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Affiliation(s)
- P Jouvet
- Weston Laboratory, Division of Paediatrics, Obstetrics and Gynaecology, Imperial College of Science, Technology and Medicine, Hammersmith Hospital, London W12 0NN, United Kingdom
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7
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Jouvet P, Rustin P, Taylor DL, Pocock JM, Felderhoff-Mueser U, Mazarakis ND, Sarraf C, Joashi U, Kozma M, Greenwood K, Edwards AD, Mehmet H. Branched chain amino acids induce apoptosis in neural cells without mitochondrial membrane depolarization or cytochrome c release: implications for neurological impairment associated with maple syrup urine disease. Mol Biol Cell 2000; 11:1919-32. [PMID: 10793161 PMCID: PMC14893 DOI: 10.1091/mbc.11.5.1919] [Citation(s) in RCA: 88] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Maple syrup urine disease (MSUD) is an inborn error of metabolism caused by a deficiency in branched chain alpha-keto acid dehydrogenase that can result in neurodegenerative sequelae in human infants. In the present study, increased concentrations of MSUD metabolites, in particular alpha-keto isocaproic acid, specifically induced apoptosis in glial and neuronal cells in culture. Apoptosis was associated with a reduction in cell respiration but without impairment of respiratory chain function, without early changes in mitochondrial membrane potential and without cytochrome c release into the cytosol. Significantly, alpha-keto isocaproic acid also triggered neuronal apoptosis in vivo after intracerebral injection into the developing rat brain. These findings suggest that MSUD neurodegeneration may result, at least in part, from an accumulation of branched chain amino acids and their alpha-keto acid derivatives that trigger apoptosis through a cytochrome c-independent pathway.
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Affiliation(s)
- P Jouvet
- Weston Laboratory, Division of Paediatrics, Obstetrics, and Gynaecology, Imperial College of Science, Technology, and Medicine, Hammersmith Hospital, London W12 0NN, United Kingdom
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8
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Joashi UC, Greenwood K, Taylor DL, Kozma M, Mazarakis ND, Edwards AD, Mehmet H. Poly(ADP ribose) polymerase cleavage precedes neuronal death in the hippocampus and cerebellum following injury to the developing rat forebrain. Eur J Neurosci 1999; 11:91-100. [PMID: 9987014 DOI: 10.1046/j.1460-9568.1999.00409.x] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Transient unilateral forebrain hypoxia-ischaemia (HI) in 14-day-old rats produces infarction and delayed neuronal death in the frontal cortex. Cell death can also be observed in regions distant from the primary injury, a phenomenon known as diaschisis. While apoptosis is involved in selective neuronal death, its role in infarction and diaschisis remains poorly understood. Here, we have investigated the proteolytic cleavage of poly(ADP ribose) polymerase (PARP) and the occurrence of apoptosis in the hippocampus and the cerebellum following either HI or traumatic brain injury. We demonstrate that: (i) in vitro, PARP is cleaved during apoptosis but not necrosis in cultured neuronal (N1E) cells and Swiss 3T3 fibroblasts; (ii) following HI, apoptotic cells can be detected by 4 h after injury in the hippocampus; (iii) in the ipsilateral hippocampus the appearance of cells with apoptotic morphology is preceded by a dramatic increase in PARP cleavage in the same region, starting immediately following HI and persisting for 24 h; (iv) HI also induces apoptosis in the cerebellum and, as in the hippocampus, the appearance of cells with apoptotic morphology is preceded by PARP cleavage that is greater on the side ipsilateral to forebrain injury; and (v) similarly, traumatic brain injury to the forebrain leads to PARP cleavage and apoptosis in the cerebellum. We conclude that HI injury or traumatic injury to the developing rat forebrain leads to PARP cleavage in directly affected areas and in sites distant from the primary injury that precedes the appearance of cells with apoptotic morphology. Our results are consistent with a role for apoptotic cell death in infarction and in diaschisis resulting from forebrain injury to the developing brain.
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Affiliation(s)
- U C Joashi
- Weston Laboratory, Division of Paediatrics, Obstetrics and Gynaecology, Imperial College School of Medicine, Hammersmith Hospital, London, U.K
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9
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11
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Szöke J, Kacsó Z, Kozma M, Tóbel M. [Wire/composite splinting of traumatically injured permanent teeth]. Fogorv Sz 1991; 84:213-8. [PMID: 1680755] [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: 12/28/2022]
Abstract
For splinting traumatically loosened and/or reimplanter remaining front teeth wire splints are used which are fixed by means of composite substance, gluing technique. Kinds of employed splints are disclosed and the steps of the practical carrying out of splinting are described. Indications, advantages and disadvantages of its employment are discussed.
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Affiliation(s)
- J Szöke
- Apáthy István Gyermekkórház-Rendelöintézet, Budapest
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12
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Földes V, Mojzes L, Kozma M. [Impalement following a fall from a great height]. Arch Kriminol 1990; 186:12-6. [PMID: 2278503] [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
A case of impalement caused by an accidental fall from height is reported. A wooden pile had penetrated the soft parts of the left gluteal region and of the adjacent thigh.
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Affiliation(s)
- V Földes
- Institut für Rechtsmedizin der Medizinischen Universität Szeged
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13
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Szöke J, Kozma M. [Results of 3-year study of toothbrushing with a fluoride amine gel]. Oralprophylaxe 1989; 11:137-43. [PMID: 2639721] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
265 6-year-old children were investigated over a period of 3 years. In the test group, 6 toothbrushing exercises and 25-30 controlled applications of Elmex Gelèe were carried out yearly. The effect was analyzed by oral hygiene, caries frequency, caries intensity, and caries increase. The improvement of the oral hygiene index according to Silness-Löe was 30% and can be characterized as highly statistically significant (p less than 0.001). The inhibition of caries increase related to the surface (delta DMF-S) was 53% in the case of caries with substance loss and was also highly significant.
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14
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Kozma M, Vajda M, Vereczkey L. Comparative pharmacokinetics of two crystalline forms of famotidine in dogs. J Pharm Biomed Anal 1989; 7:981-5. [PMID: 2490107 DOI: 10.1016/0731-7085(89)80023-8] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- M Kozma
- Department of Pharmacokinetics and Drug Metabolism, Chemical Works of Gedeon Richter Ltd, Budapest, Hungary
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15
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Szöke J, Kozma M. [Results of a three-year group test of the use of Elmex gel]. Fogorv Sz 1988; 81:161-7. [PMID: 3077362] [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: 01/04/2023]
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16
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Zurier RB, Kozma M, Sinnett-Smith J, Rozengurt E. Vasoactive intestinal peptide synergistically stimulates DNA synthesis in mouse 3T3 cells: role of cAMP, Ca2+, and protein kinase C. Exp Cell Res 1988; 176:155-61. [PMID: 2836226 DOI: 10.1016/0014-4827(88)90129-2] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.8] [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: 01/02/2023]
Abstract
Vasoactive intestinal peptide synergistically stimulated initiation of DNA synthesis in Swiss 3T3 cells. The peptide stimulated [3H]thymidine incorporation in the presence of insulin and either forskolin or an inhibitor of cAMP phosphodiesterase in a concentration-dependent manner. Half-maximal effect was obtained at 1 nM. At mitogenic concentrations, VIP stimulated a marked accumulation (eightfold) of cAMP. In contrast to other growth-promoting neuropeptides, VIP did not induce an increase in cytosolic free Ca2+ or an activation of protein kinase C. We conclude that neuropeptides can modulate long-term cell proliferation through multiple signaling pathways.
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Affiliation(s)
- R B Zurier
- Imperial Cancer Research Fund, London, United Kingdom
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17
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Vajda M, Tegyey Z, Kozma M, Vereczkey L. Studies on the pharmacokinetics and metabolism of N(4)-carbamoyl-1,3,4,5-dihydro-diazepam (Uxepam(R)) in rats, dogs and man. J Pharm Biomed Anal 1986; 4:497-503. [PMID: 16867586 DOI: 10.1016/0731-7085(86)80071-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/1984] [Revised: 02/01/1985] [Indexed: 11/29/2022]
Abstract
The pharmacokinetics and metabolism of Uxepam(R), a new minor tranquillizer, have been investigated in rats [2], dogs and man. For the experiments in rats [2] separation of metabolites of 2-(14)C-uxepam was achieved by thin-layer chromatography. In the experiments on dogs and man, Extrelut microcolumns were used for preseparation. Recovery was 95% +/- 12.77 (S.D.) determined by radioactive tracer experiments. The compounds were separated and determined by reversed-phase HPLC with UV detection at 240 nm. The limit of detection for uxepam was 10 ng ml(-1). The metabolises were identified by mass spectrometry. The main metabolites in the rat were desmethyl-uxepam, 5-hydroxy-phenyl-desmethyl-uxepam and diazepam. Desmethyl-carbamoyl-dihydro-diazepam, diazepam and desmethyl-diazepam were found in human plasma. In dogs only one metabolite, desmethyl-uxepam, was detected in plasma. Enterohepatic recycling was observed in dogs and in humans.
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Affiliation(s)
- M Vajda
- Central Research Institute for Chemistry, Budapest, Hungary
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Vereczkey L, Kozma M, Kerpel-Fronius S. Comparative bioavailability studies on different cimetidine preparations. Acta Pharm Hung 1985; 55:217-20. [PMID: 4050449] [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: 01/08/2023]
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Rónai-Lukács S, Kozma M, Vereczkey L. High-performance liquid chromatographic method for quantitative determination of Yutac, a new antiarrhythmic agent, in dog plasma. J Chromatogr 1985; 338:428-32. [PMID: 3998028 DOI: 10.1016/0378-4347(85)80116-x] [Citation(s) in RCA: 2] [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: 01/08/2023]
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Kozma M, Vereczkey L. Rapid method for determination of cimetidine in biological fluids by high-performance liquid chromatography using Extrelut extraction. J Chromatogr 1983; 273:223-7. [PMID: 6853654 DOI: 10.1016/s0378-4347(00)80943-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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Abstract
A method is described for measuring the concentrations of apovincaminic acid and vincaminic acid (internal standard) in blood plasma and urine by high-performance liquid chromatography using ion pair extraction. The main metabolite of vinpocetine, apovincaminic acid, and vincaminic acid were extracted from 1 ml of plasma and urine into chloroform as an ion pair using tetrabutylammonium hydroxide as counter ion. Analysis was carried out on a reversed-phase column of RP-8 with acetonitrile-0.0075 M phosphate buffer (28:72) at pH 3.5 as mobile phase. The eluted derivatives were detected by UV absorption at 254 nm. The sensitivity of the method is 20 ng/ml for AVA in plasma and urine samples. The relative recovery of these compounds added to plasma was about 50%.
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Kozma M, Szerdahelyi P. Zinc deficiency-induced trace element concentration and localization changes in the central nervous system of albino rat during postnatal development. I. Optical microscopic histochemical examinations. Acta Histochem 1982; 70:54-61. [PMID: 6179124 DOI: 10.1016/s0065-1281(82)80097-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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Szerdahelyi P, Kozma M, Ferke A. Zinc deficiency-induced trace element concentration and localization changes in the central nervous system of albino rat during postnatal development. II. Atomic absorption spectrophotometric examinations. Acta Histochem 1982; 70:173-82. [PMID: 6810629 DOI: 10.1016/s0065-1281(82)80068-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
The changes in the zinc and copper concentrations in the central nervous system (spinal cord, cerebellum, cerebrum, hippocampus, corpus striatum) of albino rat were studied by atomic absorption spectrophotometry in a state of zinc deficiency induced experimentally during the first 30 days of postnatal ontogenesis. It was found that in these structures the zinc deficiency is able to influence the changes and tendencies in the trace element content essentially only in an area undergoing intensive development in the given period, or which is sensitive to unsatisfactory dietary influences. The results lead to the assumption that the state of zinc deficiency is accompanied by a change in the distribution of the trace element content within the cells.
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Abstract
Trace elements (Zn2+, Cu2+, Fe2+) were localized with Timm's sulphide silver method in the neurons (pyramidal cells, Purkinje's cells, motoneurons) and in the axon terminals of various regions cortex, hippocampus, nucleus ruber, cerebellum, medulla spinalis) of the central nervous system. After treatment of the same tissues with 15% trichloroacetic acid, a considerable proportion of the coarse granular staining disappeared from certain neurons (Purkinje's cells, ncl. ruber cells, motoneurons) and axon terminals (hippocampus mossy fibres), while in other cells (cortex pyramidal cells) and axon terminals it remained. The results suggest that the decrease in the staining is a consequence of the loss of Zn2+ and Fe2+ from the neuronal perikaryon or axon terminal. The histochemical results are supported by quantitative atomic absorption measurements.
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Ferke A, Kozma M, Bánsághy K, Kása P. Histochemical and atomic absorption demonstration of trace metal mobilization in the central nervous system and liver of the rat. Histochemistry 1979; 59:295-303. [PMID: 429206 DOI: 10.1007/bf00689611] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Histochemical and atomic absorption spectrophotometric analysis of trace metal mobilization caused by the action of ethanol in the central nervous system (CNS) and liver of the rat is described. Histochemically it has been shown that in all neurons examined (motoneurons, pyramidal and Purkinje cells) the trace metals (mainly Zn2+ and Cu2+) are mobilized. Most of the stained materials disappear from the perikaryon of the Purkinje cells, while in both the motoneurons and the pyramidal cells the trace metals are displaced from the perikaryon into the axon and axon hillock. At the same time, some of the glia cells display a high metal content. Quantitative determination of the Zn2+ and Cu2+ by means of atomic absorption spectrophotometry reveals that after 2 hours ethanol treatment both the Zn2+ and the Cu2+ levels are decreased in the archicerebellar cortex, while after 4 hours the Zn2+ levels are increased in the cerebrum and the spinal cord. The present observations on the histochemical localization and the contents of zinc and copper in different parts of the CNS and liver reveal the important role of the effect of ethanol on the trace metal mobilization.
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Abstract
Changes in concentration and localization of the trace metals during postnatal ontogenetic development in the archi-, paleo-, and neurocerebellum, the cortex and the spinal cord of the rat have been studied by means of histochemical and atomic absorption spectrophotometric analysis. It has been shown that the trace elements in the different regions of the nervous system become progressively detectable during the postnatal ontogenesis, and in the various structures (PURKINJE cells, pyramidal cells, motoneurons, mossy-fibre terminals) different times are necessary for the attainment of the localization observed in the mature animals. It is suggested that the trace elements may be transported not only intraneuronally, but also from neuron to neuron, from neuron to glia cell, and in the reverse direction, too.
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Abstract
The quantitative distribution of heavy metals in the central nervous system was studied by atomic absorption spectrophotometry. It was shown that, of the regions studied, the archicerebellar cortex contains the highest levels of metals. A light microscopical histochemical technique (TIMM silver sulphide method) reveals the neurons and glial cells which possess the trace elements. Ultrastructurally, the staining occurs in different axon terminals, lysosomes, neuronal surface membranes and the cytoplasm of glial cells.
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Várkonyi T, Varga L, Náfrádi J, Kozma M, Kása P, Varró V. Autoradiographic study with 14C-labelled pentagastrin in the rat. Acta Hepatogastroenterol (Stuttg) 1976; 23:426-9. [PMID: 1007831] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
An autoradiographic light-microscopic study was made to attempt to follow the course of metabolism and elimination of glycine labelled pentagastrin in rat. It was found that even 10 seconds after the intravenous injection of 14C-labelled pentagastrin, activity can be observed in the liver and in connection with the parietal cells of the gastric mucosa; the radioactive grains remain in the hepatocytes for a prolonged period, whereas they disappear very quickly from the stomach. Activity can be detected in the renal tubuli 2 minutes or more after labelled pentagastrin administration.
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Csillik B, Jancsó G, Tóth L, Kozma M, Kálmán G, Karcsu S. Adrenergic innervation of hypothalamic blood vessels. A contribution to the problem of central thermodetectors. Acta Anat (Basel) 1971; 80:142-51. [PMID: 5132817 DOI: 10.1159/000143684] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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Kemény V, Pethes G, Kozma M. Chromatographically separable fractions in the extract of bursa of Fabricius in the chicken. Comp Biochem Physiol 1968; 26:757-9. [PMID: 5758392 DOI: 10.1016/0010-406x(68)90671-3] [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: 01/16/2023]
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31
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Fruschelli C, Kozma M. [Histotopochemistry of the succinate dehydrogenase activity of the thoracic duct of the dog]. Boll Soc Ital Biol Sper 1966; 42:769-71. [PMID: 5973338] [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: 01/17/2023]
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Földi M, Gellért A, Kozma M, Poberai M, Zoltán OT, Csanda E. New contributions to the anatomical connections of the brain and the lymphatic system. Acta Anat (Basel) 1966; 64:498-505. [PMID: 5957959 DOI: 10.1159/000142849] [Citation(s) in RCA: 47] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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