1
|
Garcia-Llorens J, Garcia C, Paulet P, Le-Tallec B, Dauphin G, Comte S, Catalá-Gregori P, Simon F, Sevilla-Navarro S, Sarabia J. Research Note: Validation of a new differentiation approach using the commercial ASAP TM media to detect the Salmonella 441/014 vaccine strain. Poult Sci 2024; 103:103679. [PMID: 38701627 PMCID: PMC11087708 DOI: 10.1016/j.psj.2024.103679] [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: 12/21/2023] [Revised: 03/14/2024] [Accepted: 03/16/2024] [Indexed: 05/05/2024] Open
Abstract
Vaccination is one of the most important control tools to reduce Salmonella in poultry production. In order for a live vaccine to be licensed for field use it should be provided with the detection methods to differentiate it from field strains. This paper aims to describe the validation of an alternative method for the differentiation of the Salmonella 441/014 vaccine strain from field strains, using a chromogenic Media, ASAP from bioMérieux. The ASAP-based differentiation method was compared with already authorized methods, namely the Anicon SE Kylt PCR DIVA 1 assay and Ceva S-Check Salmonella differentiation kit, following the ISO 16140-6:2019 validation method guidelines. A Generalised Linear Model was fitted to the data to determine the inclusivity and exclusivity of differentiation methods (PCR Kylt vs. S-Check vs. ASAPTM). Statistical differences were based on a P-value level of < 0.05 (SPSS Inc., Chicago, IL). In this study, we show that the ASAP media was able to differentiate Salmonella Enteritidis vaccine strains from field strains, obtaining 100% agreement between the three differentiation assays. This differentiation approach is quicker, easier to deploy and cheaper as compared to alternative methods.
Collapse
Affiliation(s)
- J Garcia-Llorens
- Centro de Calidad Avícola y Alimentación Animal de la Comunidad Valenciana (CECAV), 12539, Alquerías del Niño Perdido, Castellón, Spain
| | - C Garcia
- Centro de Calidad Avícola y Alimentación Animal de la Comunidad Valenciana (CECAV), 12539, Alquerías del Niño Perdido, Castellón, Spain
| | - P Paulet
- Ceva Santé Animale, 10 Avenue de la Ballastière, 33500 Libourne, France
| | - B Le-Tallec
- Ceva Santé Animale, 10 Avenue de la Ballastière, 33500 Libourne, France
| | - G Dauphin
- Ceva Santé Animale, 10 Avenue de la Ballastière, 33500 Libourne, France
| | - S Comte
- Ceva Santé Animale, 10 Avenue de la Ballastière, 33500 Libourne, France
| | - P Catalá-Gregori
- Centro de Calidad Avícola y Alimentación Animal de la Comunidad Valenciana (CECAV), 12539, Alquerías del Niño Perdido, Castellón, Spain
| | - F Simon
- bioMérieux, Marcy l'Etoile, 69280, France
| | - S Sevilla-Navarro
- Centro de Calidad Avícola y Alimentación Animal de la Comunidad Valenciana (CECAV), 12539, Alquerías del Niño Perdido, Castellón, Spain.
| | - J Sarabia
- Ceva Santé Animale, 10 Avenue de la Ballastière, 33500 Libourne, France
| |
Collapse
|
2
|
Rabaste F, Guyot J, Dauphin G, Jeminet G, Delort AM. Monensin-induced modifications of ionic gradients on Streptococcus faecalis. A 23Na and 31P NMR study. ACTA ACUST UNITED AC 2017. [DOI: 10.1051/jcp/1992890217] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
|
3
|
Arafa AS, Naguib MM, Luttermann C, Selim AA, Kilany WH, Hagag N, Samy A, Abdelhalim A, Hassan MK, Abdelwhab EM, Makonnen Y, Dauphin G, Lubroth J, Mettenleiter TC, Beer M, Grund C, Harder TC. Emergence of a novel cluster of influenza A(H5N1) virus clade 2.2.1.2 with putative human health impact in Egypt, 2014/15. ACTA ACUST UNITED AC 2015; 20:2-8. [PMID: 25860390 DOI: 10.2807/1560-7917.es2015.20.13.21085] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
A distinct cluster of highly pathogenic avian influenzaviruses of subtype A(H5N1) has been found to emergewithin clade 2.2.1.2 in poultry in Egypt since summer2014 and appears to have quickly become predominant.Viruses of this cluster may be associated withincreased incidence of human influenza A(H5N1) infectionsin Egypt over the last months.
Collapse
Affiliation(s)
- A S Arafa
- National Laboratory for Veterinary Quality Control on Poultry Production, Animal Health Research Institute, Dokki, Giza, Egypt
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
4
|
Schultz-Cherry S, Webby RJ, Webster RG, Kelso A, Barr IG, McCauley JW, Daniels RS, Wang D, Shu Y, Nobusawa E, Itamura S, Tashiro M, Harada Y, Watanabe S, Odagiri T, Ye Z, Grohmann G, Harvey R, Engelhardt O, Smith D, Hamilton K, Claes F, Dauphin G. Influenza gain-of-function experiments: their role in vaccine virus recommendation and pandemic preparedness. mBio 2014; 5:e02430-14. [PMID: 25505124 PMCID: PMC4278542 DOI: 10.1128/mbio.02430-14] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
In recent years, controversy has arisen regarding the risks and benefits of certain types of gain-of-function (GOF) studies involving avian influenza viruses. In this article, we provide specific examples of how different types of data, including information garnered from GOF studies, have helped to shape the influenza vaccine production process-from selection of candidate vaccine viruses (CVVs) to the manufacture and stockpiling of safe, high-yield prepandemic vaccines for the global community. The article is not written to support a specific pro- or anti-GOF stance but rather to inform the scientific community about factors involved in vaccine virus selection and the preparation of prepandemic influenza vaccines and the impact that some GOF information has had on this process.
Collapse
Affiliation(s)
- S Schultz-Cherry
- WHO Collaborating Center for Studies on the Ecology of Influenza in Animals, Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - R J Webby
- WHO Collaborating Center for Studies on the Ecology of Influenza in Animals, Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - R G Webster
- WHO Collaborating Center for Studies on the Ecology of Influenza in Animals, Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, Tennessee, USA
| | - A Kelso
- WHO Collaborating Centre for Reference and Research on Influenza, Peter Doherty Institute for Infection and Immunity, Melbourne, Victoria, Australia
| | - I G Barr
- WHO Collaborating Centre for Reference and Research on Influenza, Peter Doherty Institute for Infection and Immunity, Melbourne, Victoria, Australia
| | - J W McCauley
- WHO Collaborating Centre for Reference and Research on Influenza, Division of Virology, MRC National Institute for Medical Research, Mill Hill, London, United Kingdom
| | - R S Daniels
- WHO Collaborating Centre for Reference and Research on Influenza, Division of Virology, MRC National Institute for Medical Research, Mill Hill, London, United Kingdom
| | - D Wang
- WHO Collaborating Center for Reference and Research on Influenza, Chinese National Influenza Center, National Institute for Viral Disease Control and Prevention China CDC, Beijing, People's Republic of China
| | - Y Shu
- WHO Collaborating Center for Reference and Research on Influenza, Chinese National Influenza Center, National Institute for Viral Disease Control and Prevention China CDC, Beijing, People's Republic of China
| | - E Nobusawa
- WHO Collaborating Centre for Reference and Research on Influenza, National Institute of Infectious Diseases, Laboratory of Influenza Virus Surveillance, Influenza Virus Research Center, Tokyo, Japan
| | - S Itamura
- WHO Collaborating Centre for Reference and Research on Influenza, National Institute of Infectious Diseases, Laboratory of Influenza Virus Surveillance, Influenza Virus Research Center, Tokyo, Japan
| | - M Tashiro
- WHO Collaborating Centre for Reference and Research on Influenza, National Institute of Infectious Diseases, Laboratory of Influenza Virus Surveillance, Influenza Virus Research Center, Tokyo, Japan
| | - Y Harada
- WHO Collaborating Centre for Reference and Research on Influenza, National Institute of Infectious Diseases, Laboratory of Influenza Virus Surveillance, Influenza Virus Research Center, Tokyo, Japan
| | - S Watanabe
- WHO Collaborating Centre for Reference and Research on Influenza, National Institute of Infectious Diseases, Laboratory of Influenza Virus Surveillance, Influenza Virus Research Center, Tokyo, Japan
| | - T Odagiri
- WHO Collaborating Centre for Reference and Research on Influenza, National Institute of Infectious Diseases, Laboratory of Influenza Virus Surveillance, Influenza Virus Research Center, Tokyo, Japan
| | - Z Ye
- Division of Viral Products, Office of Vaccines Research and Review, Center for Biologics Evaluation and Research, Food and Drug Administration, Rockville, Maryland, USA
| | - G Grohmann
- Immunology and Vaccines, Therapeutic Goods Administration Laboratories, Woden, ACT, Australia
| | - R Harvey
- National Institute for Biological Standards and Control, Medicines and Healthcare Products Regulatory Agency, Potters Bar, United Kingdom
| | - O Engelhardt
- National Institute for Biological Standards and Control, Medicines and Healthcare Products Regulatory Agency, Potters Bar, United Kingdom
| | - D Smith
- Center for Pathogen Evolution, Department of Zoology, WHO CC for Modeling Evolution and Control of Emerging Infectious Diseases, University of Cambridge, Cambridge, United Kingdom
| | - K Hamilton
- OIE Scientific and Technical Department, OIE, Paris, France
| | - F Claes
- OFFLU/EMPRES Laboratory Unit, Animal Health Service, FAO, Rome, Italy
| | - G Dauphin
- OFFLU/EMPRES Laboratory Unit, Animal Health Service, FAO, Rome, Italy
| |
Collapse
|
5
|
Freidl GS, Meijer A, de Bruin E, de Nardi M, Munoz O, Capua I, Breed AC, Harris K, Hill A, Kosmider R, Banks J, von Dobschuetz S, Stark K, Wieland B, Stevens K, van der Werf S, Enouf V, van der Meulen K, Van Reeth K, Dauphin G, Koopmans M, FLURISK Consortium. Influenza at the animal–human interface: a review of the literature for virological evidence of human infection with swine or avian influenza viruses other than A(H5N1). Euro Surveill 2014; 19. [DOI: 10.2807/1560-7917.es2014.19.18.20793] [Citation(s) in RCA: 95] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
Factors that trigger human infection with animal influenza virus progressing into a pandemic are poorly understood. Within a project developing an evidence-based risk assessment framework for influenza viruses in animals, we conducted a review of the literature for evidence of human infection with animal influenza viruses by diagnostic methods used. The review covering Medline, Embase, SciSearch and CabAbstracts yielded 6,955 articles, of which we retained 89; for influenza A(H5N1) and A(H7N9), the official case counts of the World Health Organization were used. An additional 30 studies were included by scanning the reference lists. Here, we present the findings for confirmed infections with virological evidence. We found reports of 1,419 naturally infected human cases, of which 648 were associated with avian influenza virus (AIV) A(H5N1), 375 with other AIV subtypes, and 396 with swine influenza virus (SIV). Human cases naturally infected with AIV spanned haemagglutinin subtypes H5, H6, H7, H9 and H10. SIV cases were associated with endemic SIV of H1 and H3 subtype descending from North American and Eurasian SIV lineages and various reassortants thereof. Direct exposure to birds or swine was the most likely source of infection for the cases with available information on exposure.
Collapse
Affiliation(s)
- G S Freidl
- National Institute for Public Health and the Environment (RIVM), Centre for Infectious Diseases Research, Diagnostics and Screening (IDS), Bilthoven, the Netherlands
- Department of Viroscience, Erasmus Medical Center, Rotterdam, the Netherlands
| | - A Meijer
- National Institute for Public Health and the Environment (RIVM), Centre for Infectious Diseases Research, Diagnostics and Screening (IDS), Bilthoven, the Netherlands
| | - E de Bruin
- National Institute for Public Health and the Environment (RIVM), Centre for Infectious Diseases Research, Diagnostics and Screening (IDS), Bilthoven, the Netherlands
| | - M de Nardi
- Istituto Zooprofilattico Sperimentale delle Venezie (IZSVe), OIE/FAO and National Reference Laboratory for Newcastle Disease and Avian Influenza, OIE Collaborating Centre for Diseases at the Human–Animal Interface, Padova, Italy
| | - O Munoz
- Istituto Zooprofilattico Sperimentale delle Venezie (IZSVe), OIE/FAO and National Reference Laboratory for Newcastle Disease and Avian Influenza, OIE Collaborating Centre for Diseases at the Human–Animal Interface, Padova, Italy
| | - I Capua
- Istituto Zooprofilattico Sperimentale delle Venezie (IZSVe), OIE/FAO and National Reference Laboratory for Newcastle Disease and Avian Influenza, OIE Collaborating Centre for Diseases at the Human–Animal Interface, Padova, Italy
| | - A C Breed
- Animal Health and Veterinary Agency (AHVLA), Surrey, United Kingdom
| | - K Harris
- Animal Health and Veterinary Agency (AHVLA), Surrey, United Kingdom
| | - A Hill
- Animal Health and Veterinary Agency (AHVLA), Surrey, United Kingdom
- Royal Veterinary College (RVC), London, United Kingdom
| | - R Kosmider
- Animal Health and Veterinary Agency (AHVLA), Surrey, United Kingdom
| | - J Banks
- Animal Health and Veterinary Agency (AHVLA), Surrey, United Kingdom
| | - S von Dobschuetz
- United Nations Food and Agricultural Organization (FAO), Rome, Italy
- Royal Veterinary College (RVC), London, United Kingdom
| | - K Stark
- Royal Veterinary College (RVC), London, United Kingdom
| | - B Wieland
- Royal Veterinary College (RVC), London, United Kingdom
| | - K Stevens
- Royal Veterinary College (RVC), London, United Kingdom
| | | | - V Enouf
- Institut Pasteur, Paris, France
| | | | | | - G Dauphin
- United Nations Food and Agricultural Organization (FAO), Rome, Italy
| | - M Koopmans
- Department of Viroscience, Erasmus Medical Center, Rotterdam, the Netherlands
- National Institute for Public Health and the Environment (RIVM), Centre for Infectious Diseases Research, Diagnostics and Screening (IDS), Bilthoven, the Netherlands
| | - FLURISK Consortium
- http://www.izsvenezie.it/index.php?option=com_content&view=article&id=1203&Itemid=629
| |
Collapse
|
6
|
De Nardi M, Hill A, von Dobschuetz S, Munoz O, Kosmider R, Dewe T, Harris K, Freidl G, Stevens K, van der Meulen K, Stäerk K, Breed A, Meijer A, Koopmans M, Havelaar A, van der Werf S, Banks J, Wieland B, van Reeth K, Dauphin G, Capua I. Development of a risk assessment methodological framework for potentially pandemic influenza strains (FLURISK). ACTA ACUST UNITED AC 2014. [DOI: 10.2903/sp.efsa.2014.en-571] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- M. De Nardi
- Istituto Zooprofilattico Sperimentale delle Venezie (Project Coordinator) Italy
| | - A. Hill
- Animal Health and Veterinary Agency (AHVLA) United Kingdom
| | - S. von Dobschuetz
- Royal Veterinary College (RVC) United Kingdom
- Food and Agricultural Organization of the United Nations (FAO) Italy
| | - O. Munoz
- Istituto Zooprofilattico Sperimentale delle Venezie (Project Coordinator) Italy
| | - R. Kosmider
- Animal Health and Veterinary Agency (AHVLA) United Kingdom
| | - T. Dewe
- Animal Health and Veterinary Agency (AHVLA) United Kingdom
| | - K. Harris
- Animal Health and Veterinary Agency (AHVLA) United Kingdom
| | - G. Freidl
- National Institute for Public Health and the Environment (RIVM), Laboratory for Infectious Diseases Research, Diagnostics and Screening (IDS) the Netherlands
| | - K. Stevens
- Royal Veterinary College (RVC) United Kingdom
| | - K. van der Meulen
- Laboratory of Virology, Faculty of Veterinary Medicine, Ghent University Belgium
| | | | - A. Breed
- Animal Health and Veterinary Agency (AHVLA) United Kingdom
| | - A. Meijer
- National Institute for Public Health and the Environment (RIVM), Laboratory for Infectious Diseases Research, Diagnostics and Screening (IDS) the Netherlands
| | - M. Koopmans
- National Institute for Public Health and the Environment (RIVM), Laboratory for Infectious Diseases Research, Diagnostics and Screening (IDS) the Netherlands
| | - A. Havelaar
- National Institute for Public Health and the Environment (RIVM), Laboratory for Infectious Diseases Research, Diagnostics and Screening (IDS) the Netherlands
| | | | - J. Banks
- Animal Health and Veterinary Agency (AHVLA) United Kingdom
| | - B. Wieland
- Royal Veterinary College (RVC) United Kingdom
| | - K. van Reeth
- Laboratory of Virology, Faculty of Veterinary Medicine, Ghent University Belgium
| | - G. Dauphin
- Food and Agricultural Organization of the United Nations (FAO) Italy
| | - I. Capua
- Istituto Zooprofilattico Sperimentale delle Venezie (Project Coordinator) Italy
| | | |
Collapse
|
7
|
Vincent A, Awada L, Brown I, Chen H, Claes F, Dauphin G, Donis R, Culhane M, Hamilton K, Lewis N, Mumford E, Nguyen T, Parchariyanon S, Pasick J, Pavade G, Pereda A, Peiris M, Saito T, Swenson S, Van Reeth K, Webby R, Wong F, Ciacci-Zanella J. Review of Influenza A Virus in Swine Worldwide: A Call for Increased Surveillance and Research. Zoonoses Public Health 2013; 61:4-17. [DOI: 10.1111/zph.12049] [Citation(s) in RCA: 206] [Impact Index Per Article: 18.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2012] [Indexed: 11/30/2022]
Affiliation(s)
- A. Vincent
- Virus and Prion Research Unit; USDA-ARS NADC; Ames IA USA
| | - L. Awada
- World Organization for Animal Health (OIE); Paris France
| | - I. Brown
- Animal Health and Veterinary Laboratories Agency; Weybridge UK
| | - H. Chen
- Harbin Veterinary Research Institute; Harbin China
| | - F. Claes
- Food and Agriculture Organization of the United Nations (FAO); Rome Italy
| | - G. Dauphin
- Food and Agriculture Organization of the United Nations (FAO); Rome Italy
| | | | - M. Culhane
- University of Minnesota Veterinary Diagnostic Lab; St. Paul MN USA
| | - K. Hamilton
- World Organization for Animal Health (OIE); Paris France
| | - N. Lewis
- Department of Zoology; University of Cambridge; Cambridge UK
| | - E. Mumford
- World Health Organization (WHO); Geneva Switzerland
| | - T. Nguyen
- Department of Animal Health; National Centre for Veterinary Diagnostics; Hanoi Vietnam
| | | | - J. Pasick
- Canadian Food Inspection Agency; Winnepeg Canada
| | - G. Pavade
- World Organization for Animal Health (OIE); Paris France
| | - A. Pereda
- Instituto de Virología - INTA; Buenos Aires Argentina
| | - M. Peiris
- Hong Kong University; Hong Kong City Hong Kong
| | - T. Saito
- National Institute of Animal Health; Ibaraki Japan
| | | | | | - R. Webby
- St. Jude Children's Research Hospital; Memphis TN USA
| | - F. Wong
- Australian Animal Health Laboratory; CSIRO Livestock Industries; Geelong Vic. Australia
| | | |
Collapse
|
8
|
Dauphin G, de Araujo PC, Forget P, Leroy P, Rausin L, Demarche M. [Atypical clinical presentation of a neuroblastoma in an infant]. Rev Med Liege 2013; 68:56-60. [PMID: 23469484] [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: 06/01/2023]
Abstract
A babygirl, aged six weeks, was hospitalized for rectal prolapse and isolated constipation. The investigation revealed a neuroblastoma (NB) inducing a medullar compression responsible for the sphincter disorders. NB is second among pediatric solid tumors, but is the most frequent cancer among infants. Its diagnosis is difficult because of its rarity and the variety of its symptoms. A new staging, based on imaging, has recently been proposed by the International Neuroblastoma Risk Group. With the exception of its localized, easily resectable forms, NB is best treated by chemotherapy.
Collapse
Affiliation(s)
- G Dauphin
- Service de Pédiatrie, CHR Citadelle, Liège
| | | | | | | | | | | |
Collapse
|
9
|
Arafa A, Suarez D, Kholosy SG, Hassan MK, Nasef S, Selim A, Dauphin G, Kim M, Yilma J, Swayne D, Aly MM. Evolution of highly pathogenic avian influenza H5N1 viruses in Egypt indicating progressive adaptation. Arch Virol 2012; 157:1931-47. [PMID: 22760662 DOI: 10.1007/s00705-012-1385-9] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2012] [Accepted: 05/13/2012] [Indexed: 12/20/2022]
Abstract
Highly pathogenic avian influenza (HPAI) virus of the H5N1 subtype was first diagnosed in poultry in Egypt in 2006, and since then the disease became enzootic in poultry throughout the country, affecting the poultry industry and village poultry as well as infecting humans. Vaccination has been used as a part of the control strategy to help to control the disease. Epidemiological data with sequence analysis of H5N1 viruses is important to link the mechanism of virus evolution in Egypt. This study describes the evolutionary pattern of Egyptian H5N1 viruses based on molecular characterization for the isolates collected from commercial poultry farms and village poultry from 2006 to 2011. Genetic analysis of the hemagglutinin (HA) gene was done by sequencing of the full-length H5 gene. The epidemiological pattern of disease outbreaks in Egyptian poultry farms seems to be seasonal with no specific geographic distribution across the country. The molecular epidemiological data revealed that there are two major groups of viruses: the classic group of subclade 2.2.1 and a variant group of 2.2.1.1. The classic group is prevailing mainly in village poultry and had fewer mutations compared to the originally introduced virus in 2006. Since 2009, this group has started to be transmitted back to commercial sectors. The variant group emerged by late 2007, was prevalent mainly in vaccinated commercial poultry, mutated continuously at a higher rate until 2010, and started to decline in 2011. Genetic analysis of the neuraminidase (NA) gene and the other six internal genes indicates a grouping of the Egyptian viruses similar to that obtained using the HA gene, with no obvious reassortments. The results of this study indicate that HPAI-H5N1 viruses are progressively evolving and adapting in Egypt and continue to acquire new mutations every season.
Collapse
Affiliation(s)
- A Arafa
- National Laboratory for Veterinary Quality Control on Poultry Production, Animal Health Research Institute, Dokki, Giza, Egypt.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
10
|
Domenech J, Dauphin G, Rushton J, McGrane J, Lubroth J, Tripodi A, Gilbert J, Sims LD. Experiences with vaccination in countries endemically infected with highly pathogenic avian influenza: the Food and Agriculture Organization perspective. REV SCI TECH OIE 2009; 28:293-305. [PMID: 19618633 DOI: 10.20506/rst.28.1.1865] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Vaccination has been used extensively for the control and prevention of highly pathogenic avian influenza (HPAI) caused by viruses of the H5N1 subtype in endemically infected countries. The Food and Agriculture Organization views vaccination as a legitimate aid in the control and prevention of infection and disease caused by HPAI viruses but does not see it as a panacea. Vaccination should be used as just one in a number of measures used together to reduce the effect and risk of infection. It will be required for a considerable time in endemically infected countries. The methods used in Vietnam in implementing blanket vaccination against H5N1 HPAI viruses demonstrate the steps that should be considered when introducing vaccination. So far, it has not been possible to determine the precise effect of vaccination in endemically infected countries because it has been used in combination with other measures. Well managed vaccination campaigns will reduce the incidence of infection in poultry and therefore reduce the risk to humans from these viruses. Vaccination was implemented to protect both poultry and humans, with a major goal being to reduce the risk of emergence of a human influenza pandemic virus. Economic analysis of vaccination should focus on cost-effectiveness of proposed strategies. Ex-ante and ex-post evaluation of vaccination campaigns should take into account the benefits generated in the poultry sector and for human health.
Collapse
Affiliation(s)
- J Domenech
- Food and Agriculture Organization, Viale delle Terme di Caracalla, 00100 Rome, Italy
| | | | | | | | | | | | | | | |
Collapse
|
11
|
Dauphin G, Zientara S. West Nile virus: recent trends in diagnosis and vaccine development. Vaccine 2006; 25:5563-76. [PMID: 17292514 DOI: 10.1016/j.vaccine.2006.12.005] [Citation(s) in RCA: 111] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2006] [Revised: 11/17/2006] [Accepted: 12/01/2006] [Indexed: 11/30/2022]
Abstract
West Nile virus (WNV) is a mosquito-borne flavivirus, native to Africa, Europe, and Western Asia. In many respects, WNV is an outstanding example of a zoonotic pathogen that has leaped geographical barriers and can cause severe disease in human and horse. Before the emergence of WNV in the USA, only few methods of diagnosis were available. Recently, many changes in the fields of WN diagnosis and prevention have happened. This paper will review all these new tools. After a description of the main concerns in WNV and West Nile (WN) disease in humans and animals, this review will present the main available tests for serology and virology detection, from gold standard tests to more recently developed methods. Finally, licensed vaccines and candidate vaccines developed in humans, horses and birds will also been described.
Collapse
Affiliation(s)
- G Dauphin
- AFSSA Alfort, UMR1161 (INRA-AFSSA-ENVA), 23 av Général de Gaulle, 94703 Maisons-Alfort Cedex, France
| | | |
Collapse
|
12
|
Durand B, Dauphin G, Zeller H, Labie J, Schuffenecker I, Murri S, Moutou F, Zientara S. Serosurvey for West Nile virus in horses in southern France. Vet Rec 2005; 157:711-3. [PMID: 16311385 DOI: 10.1136/vr.157.22.711] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Affiliation(s)
- B Durand
- Agence Française de Sécurité Sanitaire des Aliments, 22 rue Pierre Curie, 94703 Maisons-Alfort Cedex 07, France
| | | | | | | | | | | | | | | |
Collapse
|
13
|
Dauphin G, Zientara S. [West Nile virus infections: overview and epidemiological update]. Virologie (Montrouge) 2005; 9:395-408. [PMID: 34679285 DOI: 10.1684/vir.2011.2401] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
West Nile virus, a flavivirus transmitted by mosquitoes, has been intensively studied since a few years because of epidemics/epizootics it has caused the last ten years, in particular around the Mediterranean basin and on the North-American continent. This virus mainly circulates in birds ; migrating bird species disseminate the virus while resident species could play a role in viral cycle amplification. A large number of mammal, amphibian and reptile species can also be infected. This virus can cause a lethal disease in humans and horses. For this reason, an active and/or passive surveillance is carried out in France and in United States at different steps of the transmission cycle : insects, birds, horses and humans. This surveillance is aimed at precociously detecting viral circulation and, if detected, take suitable information, prevention and fight measures. Furthermore, the description of new transmission routes of infection has led to precaution measures for blood and organ donations in the US and in a lesser extent, in France. As West Nile epidemiology is only partially known, most of epidemics remain unpredictable and difficult to control.
Collapse
Affiliation(s)
- G Dauphin
- Agence française de sécurité sanitaire des aliments, UMR 1161 de virologie (Inra/Afssa/Enva), 23 avenue du Général-de-Gaulle, 94703 Maisons-Alfort
| | - S Zientara
- Agence française de sécurité sanitaire des aliments, UMR 1161 de virologie (Inra/Afssa/Enva), 23 avenue du Général-de-Gaulle, 94703 Maisons-Alfort
| |
Collapse
|
14
|
Zientara S, Sailleau C, Dauphin G, Roquier C, Rémond EM, Lebreton F, Hammoumi S, Dubois E, Agier C, Merle G, Bréard E. Identification of bluetongue virus serotype 2 (Corsican strain) by reverse-transcriptase PCR reaction analysis of segment 2 of the genome. Vet Rec 2002; 150:598-601. [PMID: 12036242 DOI: 10.1136/vr.150.19.598] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [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: 11/03/2022]
Abstract
In October 2000, bluetongue virus was detected on the French island of Corsica. The disease was also reported in Sardinia, Calabria, Sicily and on the Spanish islands of Majorca and Minorca. This paper describes the use of molecular techniques for a rapid identification and serotype determination of serotype 2 of the virus. The nucleotide sequences of segments 2 and 7 of the genome of the Corsican strain were determined and its phylogenetic relationships are described.
Collapse
Affiliation(s)
- S Zientara
- Agence Française de Sécurité Sanitaire des Aliments-Alfort, France
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
15
|
Albrecht-Gary AM, Blanc-Parasote S, Boyd DW, Dauphin G, Jeminet G, Juillard J, Prudhomme M, Tissier C. X-14885A: an ionophore closely related to calcimycin (A-23187). NMR, thermodynamic, and kinetic studies of cation selectivity. J Am Chem Soc 2002. [DOI: 10.1021/ja00205a007] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
16
|
Beloeil JC, Delsuc MA, Lallemand JY, Dauphin G, Jeminet G. Application of homonuclear and heteronuclear two-dimensional chemical-shift correlation NMR spectroscopy to the complete assignment of proton and carbon-13 NMR spectra of ionophorous antibiotic X.14547 A. J Org Chem 2002. [DOI: 10.1021/jo00184a025] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
17
|
Dauphin G, Fauve A, Veschambre H. Use of biological systems for the preparation of chiral molecules. 6. Preparation of stereoisomeric 2,4-diols: synthesis and conformational study of bicyclo derivatives, isomeric components of a pheromone of Trypodendron lineatum. J Org Chem 2002. [DOI: 10.1021/jo00270a040] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
18
|
Dauphin G, Legay V, Sailleau C, Smondack S, Hammoumi S, Zientara S. Evidence of Borna disease virus genome detection in French domestic animals and in foxes (Vulpes vulpes). J Gen Virol 2001; 82:2199-2204. [PMID: 11514730 DOI: 10.1099/0022-1317-82-9-2199] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [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: 11/18/2022] Open
Abstract
Borna disease virus (BDV) is an enveloped, non-segmented negative-stranded RNA virus which belongs to the Bornaviridae family. BDV is an aetiological agent of encephalitis in horses, sheep and several other vertebrate species. In order to extend our knowledge about the presence of BDV in France, a study based on BDV RNA detection by RT-nested-PCR was done with 196 animal tissues: 171 brain samples collected from different animal species (75 horses, 59 foxes, 31 cattle, 4 dogs, 1 sheep, 1 roe deer) and 25 horse blood samples. An RNA internal standard molecule was constructed and was co-amplified with the test template. This study reports the first detection of BDV RNA in France in 10 brain samples collected from horses, foxes and cattle, and from 14 horse blood samples. Detection of the BDV genome in the brains of six red foxes is the first evidence of BDV infection in this species.
Collapse
Affiliation(s)
- G Dauphin
- AFSSA Alfort, 22 rue Pierre Curie, 94703 Maisons-Alfort cedex, France1
| | - V Legay
- AFSSA Alfort, 22 rue Pierre Curie, 94703 Maisons-Alfort cedex, France1
| | - C Sailleau
- AFSSA Alfort, 22 rue Pierre Curie, 94703 Maisons-Alfort cedex, France1
| | - S Smondack
- AFSSA Alfort, 22 rue Pierre Curie, 94703 Maisons-Alfort cedex, France1
| | - S Hammoumi
- AFSSA Alfort, 22 rue Pierre Curie, 94703 Maisons-Alfort cedex, France1
| | - S Zientara
- AFSSA Alfort, 22 rue Pierre Curie, 94703 Maisons-Alfort cedex, France1
| |
Collapse
|
19
|
Dauphin G, Ragimbeau C, Malle P. Use of PFGE typing for tracing contamination with Listeria monocytogenes in three cold-smoked salmon processing plants. Int J Food Microbiol 2001; 64:51-61. [PMID: 11252511 DOI: 10.1016/s0168-1605(00)00442-6] [Citation(s) in RCA: 76] [Impact Index Per Article: 3.3] [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: 11/24/2022]
Abstract
The sites of Listeria monocytogenes contamination in three cold-smoked salmon (Salmo salar) processing plants were detected by sampling salmon and the plant's environment and equipment at different production stages. Of the 141 samples collected from three processing plants, 59 (42%) were contaminated with L. monocytogenes. The rates of contamination varied as to the plant and the sample source. L. monocytogenes isolates from 17 various contaminated seafood products (fresh, frozen and smoked fishes, cooked mussels) were also studied. A total of 155 isolates from the three plants and the various seafoods were characterized by genomic macrorestriction using ApaI and SmaI with pulsed-field gel electrophoresis (PFGE) and 82 isolates were serotyped. Macrorestriction yielded 20 pulsotypes and serotyping yielded four serovars: 1/2a, 1/2b, 1/2c, 4b (or e), with 77 (93%) belonging to serovar 1/2a. One clone of L. monocvtogenes predominated and persisted in plant I and was the only pulsotype detected in the final product although it was not isolated from raw salmon. No L. monocytogenes was detected in the smoked skinned salmon processed in plant II, even though 87% of the raw salmon was contaminated. All the smoked salmon samples collected in plant III were contaminated with a unique clone of L. monocytogenes, which may have occurred during slicing. In the three plants, the contamination of final products did not seem to originate from the L. monocytogenes present on raw salmon, but from the processing environment.
Collapse
Affiliation(s)
- G Dauphin
- Agence Française de Sécurité Sanitaire des Aliments, Laboratoire d'Etude des Produits de la Mer, Boulogne sur Mer, France.
| | | | | |
Collapse
|
20
|
Legay V, Sailleau C, Dauphin G, Zientara S. Construction of an internal standard used in RT nested PCR for Borna Disease Virus RNA detection in biological samples. Vet Res 2000; 31:565-72. [PMID: 11129800 DOI: 10.1051/vetres:2000140] [Citation(s) in RCA: 6] [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: 11/14/2022] Open
Abstract
The highly neurotropic Borna Disease Virus (BDV), which belongs to the Mononegavirales order--Bornaviridae family--is generally detected using the RT-nested-PCR. If false positive results (often caused by laboratory contaminations) can be avoided, some false negative results which are mostly due to inhibitory effects of some reaction components and/or to sample preparation errors, can occur. Thus, in order to control the RT-PCR sample, an RNA internal standard molecule named "mimic" was constructed with the same primer recognition sites as the viral nucleic acids, flanking a heterologous DNA fragment of distinct molecular weight. Because of their different sizes, the mimic and viral PCR products can be easily discriminated by agarose gel electrophoresis. The co-amplification of both BDV and mimic RNA was performed on infected cells and on biological tissues such as the brain and blood, commonly known to contain PCR inhibitor components. After mimic sensitivity studies were achieved (2.5 fg of "p40 RNA mimic" and 0.25 fg of "p24 RNA mimic"), the competitive amplification reaction between both BDV and mimic RNA was performed on these tissues. The results confirmed that nervous tissue has an inhibitory effect on RT-PCR, which supports the necessity of BDV detection by a higher sensitive method such as RT nested PCR. Moreover, these results confirmed the interest of an internal standard for BDV RNA detection in biological samples.
Collapse
Affiliation(s)
- V Legay
- Agence Française de Sécurité Sanitaire des Aliments d'Alfort, Maisons-Alfort, France
| | | | | | | |
Collapse
|
21
|
Chriél M, Stryhn H, Dauphin G. Generalised linear mixed models analysis of risk factors for contamination of Danish broiler flocks with Salmonella typhimurium. Prev Vet Med 1999; 40:1-17. [PMID: 10343330 DOI: 10.1016/s0167-5877(99)00016-1] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.4] [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: 11/29/2022]
Abstract
We present a retrospective observational study of risk factors associated with the occurrence of Salmonella typhimurium (ST) in Danish broiler flocks. The study is based on recordings from 1994 in the ante-mortem database maintained by the Danish Poultry Council. The epidemiological units are the broiler flocks (about 4000 flocks) which are clustered within producers. Broiler flocks with ST-infected parent stocks show increased risk of salmonella infection, and also the hatchery affects the salmonella status significantly. Among the rearing factors, only the use of medicine as well as the time of rearing, and the sampling method are significant. Epidemiological control would seem most efficient on starting at the top levels of the production hierarchy from which a major part of the ST contamination is derived. A secondary purpose of the study is to evaluate different statistical approaches and software for the analysis of a moderately-sized data set of veterinary origin. We compare the results from five analyses of the generalised linear mixed model (GLMM) type. The first observation is that the results agree reasonably well and lead to similar conclusions. A closer look reveals certain patterns of bias and estimation accuracy that correspond well with theoretical findings and practical experience reported in the statistical literature.
Collapse
Affiliation(s)
- M Chriél
- Department of Animal Health and Animal Science, Royal Veterinary and Agricultural University, Fredriksberg, Denmark
| | | | | |
Collapse
|
22
|
Brandon A, Dauphin G, Leyreloup AM, Rajablat M. [ Emilio has hung himself...]. Soins Psychiatr 1998:32-4. [PMID: 9555514] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
|
23
|
Rochdi M, Delort AM, Guyot J, Sancelme M, Gibot S, Gourcy JG, Dauphin G, Gumila C, Vial H, Jeminet G. Ionophore properties of monensin derivatives studied on human erythrocytes by 23Na NMR and K+ and H+ potentiometry: relationship with antimicrobial and antimalarial activities. J Med Chem 1996; 39:588-95. [PMID: 8558531 DOI: 10.1021/jm9505829] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.1] [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: 01/31/2023]
Abstract
Eight derivatives of monensin with a modified C25-C26 moiety were synthesized. Their ionophore properties were studied on human erythrocytes by measuring Na+ influx with 23Na NMR and concomitant K+ and H+ efflux by potentiometry. Modification of OH-26 led to inversion of selectivity of transport in favor of K+/Na+ in comparison with monensin. This selectivity disappeared by suppression of the C26-OH moiety. Finally the ionophore ability was lost if the head-to-tail chelation of the monensin skeleton was prevented by blocking the terminal OH-25 and -26 functions. All the compounds were inactive on Gram-negative bacteria and fungi. MIC measured on Bacillus cereus showed that derivatives with increased K+/Na+ selectivity were clearly the most active against Bacillus growth. Most of the compounds showed potential antimalarial properties in the nanomolar range when tested in vitro against Plasmodium falciparum. The IC50S measured were correlated with the whole Na+ and K+ transport efficiency rather than with the ionic selectivity. In both cases determination of initial fluxes of transport for both cations (Na+ and K+) was necessary to investigate the relationship between biological and ionophore properties.
Collapse
Affiliation(s)
- M Rochdi
- Université Blaise Pascal, U.R.A. 485 du C.N.R.S., Laboratoire de Synthèse et Etude de Systèmes à Intérêt Biologique, Aubière, France
| | | | | | | | | | | | | | | | | | | |
Collapse
|
24
|
Rochdi M, Delort A, Guyot J, Sancelme M, Dauphin G, Jeminet G. A new Na+ and K+ carrier from chemically modified monensin studied in human erythrocytes by 23Na nuclear magnetic resonance, K+ atomic absorption and H+ potentiometry. ACTA ACUST UNITED AC 1994. [DOI: 10.1016/0302-4598(94)87037-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
25
|
|
26
|
Blache Y, Gueiffier A, Chavignon O, Teulade JC, Milhavet JC, Viols H, Chapat JP, Dauphin G. Heterocyclizations in the pyrido[2,3-b]pyrazine series. J Heterocycl Chem 1994. [DOI: 10.1002/jhet.5570310127] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
27
|
Rabaste F, Jeminet G, Dauphin G, Delort AM. Na+ and K+ transport by 4-chlorophenylurethane-monensin in Enterococcus hirae de-energized and energized cells studied by 23Na-NMR and K+ atomic absorption. Biochim Biophys Acta 1993; 1179:166-9. [PMID: 8218359 DOI: 10.1016/0167-4889(93)90138-f] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Na+ and K+ movements induced by 4-chlorophenylurethane-monensin, which presents an inverted ion selectivity (K+ > Na+) in model systems compared with monensin, were followed on Enterococcus hirae cells by 23Na-NMR and K+ atomic absorption. For de-energized cells, the urethane derivative is much more selective for K+ than monensin, but only at low concentrations (10(-3)-10(-4) mM). For higher concentrations, as previously shown for monensin, the sodium and potassium movements are driven by the ion gradients present. On energized cells, both K+ and Na+ gradients were highly perturbed, and this can be related to the higher toxicity in mice and bacteria for this derivative.
Collapse
Affiliation(s)
- F Rabaste
- Laboratoire de Chimie Organique Biologique, U.R.A. 485 du CNRS, Université Blaise Pascal, Aubiere, France
| | | | | | | |
Collapse
|
28
|
Rabaste F, Jeminet G, Dauphin G, Delort AM. Conditions modulating the ionic selectivity of transport by monensin examined on Enterococcus hirae (Streptococcus faecalis) by 23Na-NMR and K+ atomic absorption. Biochim Biophys Acta 1992; 1108:177-82. [PMID: 1637842 DOI: 10.1016/0005-2736(92)90023-f] [Citation(s) in RCA: 8] [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: 12/28/2022]
Abstract
Factors likely to modulate the ionic selectivity of monensin were examined on Enterococcus hirae (Streptococcus faecalis) in two states previously characterized: the resting (de-energized) cell and the active (energized) cell. Internal and external Na+ were followed by corresponding 23Na-NMR resonances K+ concentrations were measured by atomic absorption. For a given cellular population of de-energized cells, the apparent transport rates and the final cationic concentrations reached at the steady state were decreasing with the ionophore dose. Monensin was selective for sodium only at low concentrations, in the range 1 mM-10(-4) mM the transport was depending on the effective cationic gradients. Comparison of the activity curves for two cell populations (7.10(9) and 7.10(10) cells/ml) showed the importance of the ratios of monensin/mg phospholipid and also of the ratios of external/internal volumes. On energized cells, except for low monensin concentrations, the main effect was a K(+)-induced efflux and not a Na+ influx. Two factors were modulating the resulting selectivity of this ionophore: the response of the intrinsic bacterial carriers and the generation of the gradients (mainly the external pH) which were favourable to a K+/Na+ transport. Once again the results obtained for two cell populations could be compared, the determining factors were the ratio external/internal volume and the generation of the pH gradient.
Collapse
Affiliation(s)
- F Rabaste
- Laboratoire de Chimie Organique Biologique, U.R.A. 485 du CNRS. Université Blaise Pascal, Aubiere, France
| | | | | | | |
Collapse
|
29
|
Chavignon O, Teulade JC, Madesclaire M, Gueiffier A, Blache Y, Viols H, Chapat JP, Dauphin G. Pyrrolization processes of vinyl substituted imidazo[1,2-a]pyridine, pyrimidine and 1,8-naphthyridine. J Heterocycl Chem 1992. [DOI: 10.1002/jhet.5570290403] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
30
|
Gaudet G, Forano E, Dauphin G, Delort AM. Futile cycling of glycogen in Fibrobacter succinogenes as shown by in situ 1H-NMR and 13C-NMR investigation. Eur J Biochem 1992; 207:155-62. [PMID: 1628646 DOI: 10.1111/j.1432-1033.1992.tb17032.x] [Citation(s) in RCA: 70] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Glycogen was synthesized during all the growth phases in the rumen anaerobic cellulolytic bacterium Fibrobacter succinogenes. Glycogen synthesis and degradation were monitored using in situ 13C and 1H-NMR spectroscopy in resting cells of F. succinogenes. The cells were incubated at 37 degrees C under anaerobic conditions with [1-13C]glucose and [2-13C]glucose. 1H-NMR spectra were used to quantify enrichment by 13C of metabolism products. Glucose was utilized for energy requirements of the bacterium, essentially via the Embden-Meyerhof pathway, leading to the synthesis of succinate and acetate, while glycogen was stored. From [1-13C]glucose, labeling occurred on C2 of succinate and acetate, and on both C1 and C6 of glycogen, the labeling on C1 being predominant. The C6-labeling of glycogen may be explained by scrambling and reversal of the glycolytic pathway at the triose-phosphate and fructose 1,6-bisphosphate level. When the bacteria were incubated first with [1-13C]glucose, then washed and incubated with [2-13C]glucose, the pattern of 13C labeling in the products of the metabolism, as shown by 13C and 1H-NMR spectra, indicated that glycogen was degraded at the same time as it was being stored, suggesting futile cycling of glycogen. The hydrolysis of previously stored glycogen can provide, in the presence of glucose, up to 30% of the carbon source for the bacteria.
Collapse
Affiliation(s)
- G Gaudet
- Laboratoire de Microbiologie, INRA CR de Clermont-Ferrand-Theix, France
| | | | | | | |
Collapse
|
31
|
Gueiffier A, Blache Y, Viols H, Chapat JP, Chavignon O, Teulade JC, Dauphin G, Debouzy JC, Chabard JL. Carbon-nitrogen bond formation in cyclisation by deoxygenation, thermolysis or photolysis of phenylimidazo[1,2-a][1,8]naphthyridines. J Heterocycl Chem 1992. [DOI: 10.1002/jhet.5570290202] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
32
|
Rabaste F, Dauphin G, Jeminet G, Guyot J, Delort AM. Phosphate-dependent sodium transport in S. faecalis investigated by 23Na and 31P NMR. Biochem Biophys Res Commun 1991; 181:74-9. [PMID: 1958221 DOI: 10.1016/s0006-291x(05)81383-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [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: 12/29/2022]
Abstract
Na+ movements in S. faecalis were studied by 23Na NMR. They proved to be dependent on phosphate concentration in the buffer during the de-energization step. K+ and H+ were also studied respectively by potentiometry and 31P NMR and were shown not to be implicated. For de-energized cells the internal phosphate concentration, on the contrary, was directly linked to the external phosphate contained in the buffer. The experiments showed a Na+/Pi dependence in this prokaryote so far known only in eukaryotes.
Collapse
Affiliation(s)
- F Rabaste
- Université Blaise Pascal Clermont-Ferrand, Laboratoire de Chimie Organique Biologique-U.R.A., 485 du C.N.R.S., Aubière, France
| | | | | | | | | |
Collapse
|
33
|
Affiliation(s)
- F Vaufrey
- Laboratoire de Chimie Organique Biologique, U.R.A. 485 du C.N.R.S., Université Blaise Pascal, Aubiere, France
| | | | | | | |
Collapse
|
34
|
Gueiffier A, Viols H, Chapat JP, Chavignon O, Teulade JC, Dauphin G. Heterocyclic compounds with a bridgehead nitrogen atom. Synthesis in the imidazo[1,2-c]quinazoline series. J Heterocycl Chem 1990. [DOI: 10.1002/jhet.5570270259] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
35
|
Delort AM, Dauphin G, Guyot J, Jeminet G. Study by NMR of the mode of action of monensin on Streptococcus faecalis de-energized and energized cells. Biochim Biophys Acta 1989; 1013:11-20. [PMID: 2551382 DOI: 10.1016/0167-4889(89)90121-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Streptococcus faecalis was used as a bacterial model for studying the mode of action of monensin by NMR investigations. Experiments were carried out in two states, characterized by several complementary methods: (i) the resting (de-energized) cell which was considered as an inert biological membrane, on which cationic transport induced by the ionophore alone can be investigated; (ii) the active (energized) cell where the ionophore-sensitive response of the living organism, particularly the cation pumps and the glycolysis, is probed. Studies of resting cells were performed, with changing external ionic concentrations, in the presence of monensin, which is preferentially a sodium carrier. Internal and external Na+ and H+ were followed by corresponding 23Na and 31P (inorganic phosphate) NMR resonances, K+ fluxes were measured by atomic absorption. It was shown that the induced cationic movements were linked to the existing ionic gradients for K+ and Na+. 31P and 13C NMR spectra for the intermediary metabolites detected in active cells showed that glycolysis is dramatically modified in the presence of monensin.
Collapse
Affiliation(s)
- A M Delort
- Laboratoire de Chimie Organique Biologique, U.R.A. 485 du CNRS, Université Blaise Pascal Aubière, France
| | | | | | | |
Collapse
|
36
|
Beloeil JC, Morellet N, Pasquier C, Dauphin G, Jeminet G. Study of a delta-hydroxy ketone-hemiketal equilibrium by 2D-NMR exchange spectroscopy for the antibiotic grisorixin: involvement in cationic transport through membranes. Biochimie 1989; 71:125-35. [PMID: 2497789 DOI: 10.1016/0300-9084(89)90142-9] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Study of a delta-hydroxyketone-hemiketal equilibrium in the polyether antibiotic grisorixin was performed with 2D-NMR spectroscopy. The efficiency of 13C chemical exchange spectroscopy for the assignment of 1H and 13C resonances, in the 2 forms, was shown, making possible a conformational investigation of both forms. This equilibrium was observed for grisorixin in solvents of varying polarity, such as CD2Cl2, CDCl3, CD3CN, or CD3OD, but not in C6D12 or C6D6. Other related antibiotics with the same terminal heterocycle were described only in the closed hemiacetalic structure. The low ionic fluxes measured in a bulk chloroformic membrane for grisorixin were explained by this equilibrium, which competed unfavorably with the cation capture process at the water-chloroform interface. This equilibrium would not be present in a phospholipidic bilayer membrane containing the ionophore, published experimental results are taken into account. The peculiar tautomeric equilibrium observed for grisorixin could be linked to the specific axial stereochemistry of the C7-C8 bond, which creates tension in the globular conformation.
Collapse
Affiliation(s)
- J C Beloeil
- Laboratoire de Résonance Magnétique Nucléaire, Institut de Chimie des Substances Naturelles, Gif-sur-Yvette, France
| | | | | | | | | |
Collapse
|
37
|
Abstract
A strain of Sebekia benihana NRRL 11111 was found to transform nigericin in three successive steps, giving three compounds which were isolated. Their structure were determined by IR, 1H and 13C NMR, and fast atom bombardment mass spectra. The first compound resulted from the reduction of the terminal hemiketal ring it was then transformed into the two other compounds as a result of the oxidation of methyl (C-33) into a CH2OH and COOH group respectively. All these products had lost the ionophoric and antibiotic properties of nigericin and thus were products of a detoxification process.
Collapse
Affiliation(s)
- A M Delort
- Laboratoire de Chimie Organique Biologique, U.A. 485 du C.N.R.S., Université Blaise Pascal, Aubiere, France
| | | | | | | |
Collapse
|
38
|
Prudhomme M, Dauphin G, Jeminet G. Semi-synthesis of A23187 (calcimycin) analogs. III. Modification of benzoxazole ring substituents, ionophorous properties in an organic phase. J Antibiot (Tokyo) 1986; 39:922-33. [PMID: 3093431 DOI: 10.7164/antibiotics.39.922] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Ten semi-synthetic analogs of A23187 (calcimycin), with only the benzoxazole ring substituents modified together with the ionophore X14885A were studied with regard to their calcium and magnesium carrier properties through an organic phase (toluene - butanol, 70:30). The results indicate that the carboxylic group and the oxazolic nitrogen, maintained in the ortho position are essential for the ionophorous properties. Further, the introduction of a substituent in place of the NHCH3 group, producing steric hindrance of the carboxylic group leads to a destabilization of the 2:1 associations with cations.
Collapse
|
39
|
Prudhomme M, Dauphin G, Guyot J, Jeminet G. Semisynthesis of A23187 (calcimycin) analogs. II. Introduction of a methyl group on the benzoxazole ring. J Antibiot (Tokyo) 1984; 37:627-34. [PMID: 6430853 DOI: 10.7164/antibiotics.37.627] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Semisynthesis of two demethylamino A23187 with a methyl group in the 4- or 5-position on the benzene ring were carried out via the cleavage of A23187 oxazole ring and rebuilding of modified benzoxazoles. These compounds were shown to release Ca++ and MG++ from mitochondria and to keep part the antibacterial activity of the natural metabolite.
Collapse
|
40
|
Abstract
The isolation and identification of a bioconversion product of grisorixin from a strain of Streptomyces rimosus is reported. The structure of this product was elucidated from physicochemical data, in particular 13C NMR spectra. Its ionophorous and antibiotic properties are markedly different from those of grisorixin.
Collapse
|
41
|
Abstract
Volatile sulfur compounds production by eight strains of
Brevibacterium linens
isolated from cheeses was demonstrated: methanethiol, dimethyldisulfide, and 2,3,4-trithiapentane. Four of these strains also produced
S
-methylthioacetate, an important aroma component of smear-coated cheeses. It is the first demonstrated microbiological production of a thioester.
Collapse
Affiliation(s)
- A Cuer
- Laboratoire de Chimie Organique Biologique, Equipe de Recherche Associée du Centre National de la Recherche Scientifique no. 392, 63170 Aubière, France
| | | | | | | | | |
Collapse
|
42
|
|
43
|
|
44
|
|
45
|
Dauphin G, Cousin C, Cornet E. [Intrapericardial congenital ectasias of the left atrium]. Arch Mal Coeur Vaiss 1976; 69:433-7. [PMID: 820303] [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: 12/24/2022]
Abstract
Congenital intrapericardial dilatation of the left atrium is an abnormality which is either very rare (16 cases reported in the literature) or one that is easily missed. The clinical features are unhelpful, and the diagnosis is suggested by the outline on X ray and confirmed by angiocardiography. The great importance of this abnormality lies in its natural history. Disorders of rythm (9 cases out of 16) and embolism (5 cases out of 16) are amongst the complications to be weighed up when deciding the treatment policy. Operative treatment, which is straightforward, seems to us to be indicated in all cases.
Collapse
|
46
|
Dauphin G. [Oral manifestations of white cell hemopathias]. Actual Odontostomatol (Paris) 1970; 89:29-38. [PMID: 5423217] [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: 01/15/2023]
|