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Andrieu J, Valade M, Lebideau M, Bretelle F, Mège JL, Wurtz N, Mezouar S, La Scola B, Baudoin JP. Pan-microscopic examination of monkeypox virus in trophoblasts cells reveals new insights into virions release through filopodia-like projections. J Med Virol 2024; 96:e29620. [PMID: 38647027 DOI: 10.1002/jmv.29620] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2023] [Revised: 03/04/2024] [Accepted: 03/31/2024] [Indexed: 04/25/2024]
Abstract
Vertical transmission has been described following monkeypox virus (MPXV) infection in pregnant women. The presence of MPXV has been reported in the placenta from infected women, but whether pathogens colonize placenta remains unexplored. We identify trophoblasts as a target cell for MPXV replication. In a pan-microscopy approach, we decipher the specific infectious cycle of MPXV and inner cellular structures in trophoblasts. We identified the formation of a specialized region for viral morphogenesis and replication in placental cells. We also reported infection-induced cellular remodeling. We found that MPXV stimulates cytoskeleton reorganization with intercellular extensions for MPXV cell spreading specifically to trophoblastic cells. Altogether, the specific infectious cycle of MPXV in trophoblast cells and these protrusions that were structurally and morphologically similar to filopodia reveal new insights into the infection of MPXV.
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Affiliation(s)
- Jonatane Andrieu
- Centre National de la Recherche Scientifique, Établissement Français du Sang, Anthropologie bio-culturelle, Droit, Éthique et Santé, Aix-Marseille University, Marseille, France
| | - Margaux Valade
- Institut Recherche Développement, Assistance Publique-Hôpitaux de Marseille, Microbe, Evolution, Phylogeny Infection, Aix-Marseille University, Marseille, France
| | - Marion Lebideau
- Institut Recherche Développement, Assistance Publique-Hôpitaux de Marseille, Microbe, Evolution, Phylogeny Infection, Aix-Marseille University, Marseille, France
| | - Florence Bretelle
- Institut Recherche Développement, Assistance Publique-Hôpitaux de Marseille, Microbe, Evolution, Phylogeny Infection, Aix-Marseille University, Marseille, France
- Département de gynécologie et d'obstétrique, Gynépole, La Conception, AP-HM, Marseille, France
| | - Jean-Louis Mège
- Centre National de la Recherche Scientifique, Établissement Français du Sang, Anthropologie bio-culturelle, Droit, Éthique et Santé, Aix-Marseille University, Marseille, France
- Laboratoire d'Immunologie, Assistance Publique Hôpitaux de Marseille (APHM), Marseille, France
| | - Nathalie Wurtz
- Institut Recherche Développement, Assistance Publique-Hôpitaux de Marseille, Microbe, Evolution, Phylogeny Infection, Aix-Marseille University, Marseille, France
| | - Soraya Mezouar
- Centre National de la Recherche Scientifique, Établissement Français du Sang, Anthropologie bio-culturelle, Droit, Éthique et Santé, Aix-Marseille University, Marseille, France
| | - Bernard La Scola
- Institut Recherche Développement, Assistance Publique-Hôpitaux de Marseille, Microbe, Evolution, Phylogeny Infection, Aix-Marseille University, Marseille, France
| | - Jean-Pierre Baudoin
- Institut Recherche Développement, Assistance Publique-Hôpitaux de Marseille, Microbe, Evolution, Phylogeny Infection, Aix-Marseille University, Marseille, France
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2
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Naud S, Valles C, Abdillah A, Abou Chacra L, Mekhalif FZ, Ibrahim A, Caputo A, Baudoin JP, Gouriet F, Bittar F, Lagier JC, Ranque S, Fenollar F, Tidjani Alou M, Raoult D. Preliminary landscape of Candidatus Saccharibacteria in the human microbiome. Front Cell Infect Microbiol 2023; 13:1195679. [PMID: 37577371 PMCID: PMC10414567 DOI: 10.3389/fcimb.2023.1195679] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2023] [Accepted: 07/11/2023] [Indexed: 08/15/2023] Open
Abstract
Introduction Candidate Phyla Radiation (CPR) and more specifically Candidatus Saccharibacteria (TM7) have now been established as ubiquitous members of the human oral microbiota. Additionally, CPR have been reported in the gastrointestinal and urogenital tracts. However, the exploration of new human niches has been limited to date. Methods In this study, we performed a prospective and retrospective screening of TM7 in human samples using standard PCR, real-time PCR, scanning electron microscopy (SEM) and shotgun metagenomics. Results Using Real-time PCR and standard PCR, oral samples presented the highest TM7 prevalence followed by fecal samples, breast milk samples, vaginal samples and urine samples. Surprisingly, TM7 were also detected in infectious samples, namely cardiac valves and blood cultures at a low prevalence (under 3%). Moreover, we observed CPR-like structures using SEM in all sample types except cardiac valves. The reconstruction of TM7 genomes in oral and fecal samples from shotgun metagenomics reads further confirmed their high prevalence in some samples. Conclusion This study confirmed, through their detection in multiple human samples, that TM7 are human commensals that can also be found in clinical settings. Their detection in clinical samples warrants further studies to explore their role in a pathological setting.
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Affiliation(s)
- Sabrina Naud
- Aix-Marseille Université, IRD, APHM, MEPHI, IHU Méditerranée Infection, Marseille, France
| | - Camille Valles
- Aix-Marseille Université, IRD, APHM, MEPHI, IHU Méditerranée Infection, Marseille, France
| | - Abdourahim Abdillah
- Aix Marseille Université, IRD, AP-HM, SSA, VITROME, IHU Méditerranée InfectionMarseille, France
| | - Linda Abou Chacra
- Aix Marseille Université, IRD, AP-HM, SSA, VITROME, IHU Méditerranée InfectionMarseille, France
| | - Fatima Zouina Mekhalif
- Aix-Marseille Université, IRD, APHM, MEPHI, IHU Méditerranée Infection, Marseille, France
| | - Ahmad Ibrahim
- Aix-Marseille Université, IRD, APHM, MEPHI, IHU Méditerranée Infection, Marseille, France
| | - Aurelia Caputo
- Aix-Marseille Université, IRD, APHM, MEPHI, IHU Méditerranée Infection, Marseille, France
| | - Jean-Pierre Baudoin
- Aix-Marseille Université, IRD, APHM, MEPHI, IHU Méditerranée Infection, Marseille, France
| | - Frédérique Gouriet
- Aix-Marseille Université, IRD, APHM, MEPHI, IHU Méditerranée Infection, Marseille, France
| | - Fadi Bittar
- Aix-Marseille Université, IRD, APHM, MEPHI, IHU Méditerranée Infection, Marseille, France
| | - Jean-Christophe Lagier
- Aix-Marseille Université, IRD, APHM, MEPHI, IHU Méditerranée Infection, Marseille, France
| | - Stéphane Ranque
- Aix Marseille Université, IRD, AP-HM, SSA, VITROME, IHU Méditerranée InfectionMarseille, France
| | - Florence Fenollar
- Aix Marseille Université, IRD, AP-HM, SSA, VITROME, IHU Méditerranée InfectionMarseille, France
| | - Maryam Tidjani Alou
- Aix-Marseille Université, IRD, APHM, MEPHI, IHU Méditerranée Infection, Marseille, France
| | - Didier Raoult
- Aix-Marseille Université, IRD, APHM, MEPHI, IHU Méditerranée Infection, Marseille, France
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3
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Braï MA, Hannachi N, El Gueddari N, Baudoin JP, Dahmani A, Lepidi H, Habib G, Camoin-Jau L. The Role of Platelets in Infective Endocarditis. Int J Mol Sci 2023; 24:ijms24087540. [PMID: 37108707 PMCID: PMC10143005 DOI: 10.3390/ijms24087540] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Revised: 04/02/2023] [Accepted: 04/15/2023] [Indexed: 04/29/2023] Open
Abstract
Over the last decade, the incidence of infective endocarditis (IE) has increased, with a change in the frequency of causative bacteria. Early evidence has substantially demonstrated the crucial role of bacterial interaction with human platelets, with no clear mechanistic characterization in the pathogenesis of IE. The pathogenesis of endocarditis is so complex and atypical that it is still unclear how and why certain bacterial species will induce the formation of vegetation. In this review, we will analyze the key role of platelets in the physiopathology of endocarditis and in the formation of vegetation, depending on the bacterial species. We provide a comprehensive outline of the involvement of platelets in the host immune response, investigate the latest developments in platelet therapy, and discuss prospective research avenues for solving the mechanistic enigma of bacteria-platelet interaction for preventive and curative medicine.
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Affiliation(s)
- Mustapha Abdeljalil Braï
- IRD, APHM, MEPHI, IHU Méditerranée Infection, Aix Marseille University, 19-21 Boulevard Jean Moulin, 13005 Marseille, France
- IHU Méditerranée Infection, Boulevard Jean Moulin, 13385 Marseille, France
| | - Nadji Hannachi
- Laboratoire de Biopharmacie et Pharmacotechnie, Faculté de Médecine, Université Ferhat Abbas Sétif I, Sétif 19000, Algeria
| | - Nabila El Gueddari
- IRD, APHM, MEPHI, IHU Méditerranée Infection, Aix Marseille University, 19-21 Boulevard Jean Moulin, 13005 Marseille, France
- Service de Chirurgie Cardiaque, Hôpital de la Timone, APHM, Boulevard Jean-Moulin, 13385 Marseille, France
| | - Jean-Pierre Baudoin
- IRD, APHM, MEPHI, IHU Méditerranée Infection, Aix Marseille University, 19-21 Boulevard Jean Moulin, 13005 Marseille, France
- IHU Méditerranée Infection, Boulevard Jean Moulin, 13385 Marseille, France
| | - Abderrhamane Dahmani
- IRD, APHM, MEPHI, IHU Méditerranée Infection, Aix Marseille University, 19-21 Boulevard Jean Moulin, 13005 Marseille, France
- IHU Méditerranée Infection, Boulevard Jean Moulin, 13385 Marseille, France
| | - Hubert Lepidi
- IRD, APHM, MEPHI, IHU Méditerranée Infection, Aix Marseille University, 19-21 Boulevard Jean Moulin, 13005 Marseille, France
- Service d'Anatomo-Pathologie, Hôpital de la Timone, APHM, Boulevard Jean-Moulin, 13385 Marseille, France
| | - Gilbert Habib
- IRD, APHM, MEPHI, IHU Méditerranée Infection, Aix Marseille University, 19-21 Boulevard Jean Moulin, 13005 Marseille, France
- Service de Cardiologie, Hôpital de la Timone, APHM, Boulevard Jean-Moulin, 13385 Marseille, France
| | - Laurence Camoin-Jau
- IRD, APHM, MEPHI, IHU Méditerranée Infection, Aix Marseille University, 19-21 Boulevard Jean Moulin, 13005 Marseille, France
- Laboratoire d'Hématologie, Hôpital de la Timone, APHM, Boulevard Jean-Moulin, 13385 Marseille, France
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4
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Brahim Belhaouari D, Baudoin JP, Lagier JC, Monnet-Corti V, La Scola B, Antezack A. Microscopic observations of SARS-CoV-2 like particles in different oral samples. Eur J Oral Sci 2022; 130:e12903. [PMID: 36404273 PMCID: PMC10099536 DOI: 10.1111/eos.12903] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2022] [Accepted: 10/21/2022] [Indexed: 11/22/2022]
Abstract
The emerging coronavirus pneumonia epidemic caused by the SARS-CoV-2 infection has spread rapidly around the world. The main routes of transmission of SARS-CoV-2 are currently recognised as aerosol/droplet inhalation. However, the involvement of the oral cavity in coronavirus disease 2019 (COVID-19) is poorly known. The current data indicates the presence of viral RNA in oral samples, suggesting the implication of saliva in SARS-CoV-2 transmission, however, no direct observation of SARS-CoV-2 particles in different oral samples has been reported. In this study, we investigated whether particles of SARS-CoV-2 were present in oral samples collected from three symptomatic COVID-19 patients. Using scanning electron microscopy (SEM), the correlative strategy of light microscopy and electron microscopy and immunofluorescence staining, we showed the presence of SARS-like particles in RT-qPCR SARS-CoV-2-positive saliva, dental plaque and gingival crevicular fluid (GCF) samples. In the saliva samples, we demonstrated the presence of epithelial oral cells with morphogenetic features of SARS-CoV-2 infected cells. Inside those cells, vacuoles filled with nascent particles were observed, suggesting the potential infection and replication of SARS-CoV-2 in oral tissues. Our results corroborate previous studies and confirm that the oral cavity may be a potential niche for SARS-CoV-2 infection and a potential source of transmission.
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Affiliation(s)
- Djamal Brahim Belhaouari
- IRD, AP-HM, IHU Méditerranée Infection, MEPHI, Aix Marseille Univ, Marseille, France.,Department of Veterinary Pathobiology, College of Veterinary Medicine & Biomedical Sciences, Texas A&M University, College Station, TX, USA
| | - Jean-Pierre Baudoin
- IRD, AP-HM, IHU Méditerranée Infection, MEPHI, Aix Marseille Univ, Marseille, France.,Assistance Publique-Hopitaux de Marseille, Hopital Timone, Marseille, France
| | - Jean-Christophe Lagier
- IRD, AP-HM, IHU Méditerranée Infection, MEPHI, Aix Marseille Univ, Marseille, France.,Assistance Publique-Hopitaux de Marseille, Hopital Timone, Marseille, France
| | - Virginie Monnet-Corti
- IRD, AP-HM, IHU Méditerranée Infection, MEPHI, Aix Marseille Univ, Marseille, France.,Assistance Publique-Hopitaux de Marseille, Hopital Timone, Marseille, France.,Faculté des Sciences Médicales et Paramédicales, Ecole de Médecine Dentaire, Aix Marseille Univ, Marseille, France
| | - Bernard La Scola
- IRD, AP-HM, IHU Méditerranée Infection, MEPHI, Aix Marseille Univ, Marseille, France.,Assistance Publique-Hopitaux de Marseille, Hopital Timone, Marseille, France
| | - Angéline Antezack
- IRD, AP-HM, IHU Méditerranée Infection, MEPHI, Aix Marseille Univ, Marseille, France.,Assistance Publique-Hopitaux de Marseille, Hopital Timone, Marseille, France.,Faculté des Sciences Médicales et Paramédicales, Ecole de Médecine Dentaire, Aix Marseille Univ, Marseille, France
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5
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Le Bideau M, Pires de Souza GA, Boschi C, Baudoin JP, Penant G, Jardot P, Fenollar F, Colson P, Lenk M, La Scola B. Limited permissibility of ENL-R and Mv-1-Lu mink cell lines to SARS-CoV-2. Front Microbiol 2022; 13:1003824. [PMID: 36312916 PMCID: PMC9597503 DOI: 10.3389/fmicb.2022.1003824] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2022] [Accepted: 09/14/2022] [Indexed: 11/13/2022] Open
Abstract
The SARS-CoV-2 pandemic started in the end of 2019 in Wuhan, China, which highlighted the scenario of frequent cross-species transmission events. From the outbreak possibly initiated by viral spill-over into humans from an animal reservoir, now we face the human host moving globally while interacting with domesticated and peridomestic animals. The emergence of a new virus into the ecosystem leads to selecting forces and species-specific adaptations. The adaptation of SARS-CoV-2 to other animals represents a risk to controlling the dissemination of this coronavirus and the emergence of new variants. Since 2020, several mink farms in Europe and the United States have had SARS-CoV-2 outbreaks with human–mink and mink–human transmission, where the mink-selected variants possibly hold evolutionary concerning advantages. Here we investigated the permissibility of mink lung-derived cells using two cell lines, Mv-1-Lu and ENL-R, against several lineages of SARS-CoV-2, including some classified as variants of concern. The viral release rate and the infectious titers indicate that these cells support infections by different SARS-CoV-2 lineages. The viral production occurs in the first few days after infection with the low viral release by these mink cells, which is often absent for the omicron variant for lung cells. The electron microscopy reveals that during the viral replication cycle, the endomembrane system of the mink-host cell undergoes typical changes while the viral particles are produced, especially in the first days of infection. Therefore, even if limited, mink lung cells may represent a selecting source for SARS-CoV-2 variants, impacting their transmissibility and pathogenicity and making it difficult to control this new coronavirus.
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Affiliation(s)
- Marion Le Bideau
- Microbes, Evolution, Phylogénie et Infection (MEPHI), Aix-Marseille Université, Institut de Recherche pour le Développement (IRD), Assistance Publique - Hôpitaux de Marseille (AP-HM), Marseille, France
- Institut Hospitalo-Universitaire (IHU) Méditerranée Infection, Marseille, France
| | - Gabriel Augusto Pires de Souza
- Microbes, Evolution, Phylogénie et Infection (MEPHI), Aix-Marseille Université, Institut de Recherche pour le Développement (IRD), Assistance Publique - Hôpitaux de Marseille (AP-HM), Marseille, France
- Institut Hospitalo-Universitaire (IHU) Méditerranée Infection, Marseille, France
| | - Celine Boschi
- Microbes, Evolution, Phylogénie et Infection (MEPHI), Aix-Marseille Université, Institut de Recherche pour le Développement (IRD), Assistance Publique - Hôpitaux de Marseille (AP-HM), Marseille, France
- Institut Hospitalo-Universitaire (IHU) Méditerranée Infection, Marseille, France
| | - Jean-Pierre Baudoin
- Microbes, Evolution, Phylogénie et Infection (MEPHI), Aix-Marseille Université, Institut de Recherche pour le Développement (IRD), Assistance Publique - Hôpitaux de Marseille (AP-HM), Marseille, France
- Institut Hospitalo-Universitaire (IHU) Méditerranée Infection, Marseille, France
| | - Gwilherm Penant
- Microbes, Evolution, Phylogénie et Infection (MEPHI), Aix-Marseille Université, Institut de Recherche pour le Développement (IRD), Assistance Publique - Hôpitaux de Marseille (AP-HM), Marseille, France
- Institut Hospitalo-Universitaire (IHU) Méditerranée Infection, Marseille, France
| | - Priscilla Jardot
- Microbes, Evolution, Phylogénie et Infection (MEPHI), Aix-Marseille Université, Institut de Recherche pour le Développement (IRD), Assistance Publique - Hôpitaux de Marseille (AP-HM), Marseille, France
- Institut Hospitalo-Universitaire (IHU) Méditerranée Infection, Marseille, France
| | - Florence Fenollar
- Institut Hospitalo-Universitaire (IHU) Méditerranée Infection, Marseille, France
- Vecteurs – Infections Tropicales et Méditerranéennes (VITROME), Aix Marseille Univ, Institut Hospitalo-Universitaire (IHU), AP-HM, Marseille, France
| | - Philippe Colson
- Microbes, Evolution, Phylogénie et Infection (MEPHI), Aix-Marseille Université, Institut de Recherche pour le Développement (IRD), Assistance Publique - Hôpitaux de Marseille (AP-HM), Marseille, France
- Institut Hospitalo-Universitaire (IHU) Méditerranée Infection, Marseille, France
| | - Matthias Lenk
- Collection of Cell Lines in Veterinary Medicine (CCLV), Department of Experimental Animal Facilities and Biorisk Management, Friedrich-Loeffler-Institut, Greifswald-Insel Riems, Germany
| | - Bernard La Scola
- Microbes, Evolution, Phylogénie et Infection (MEPHI), Aix-Marseille Université, Institut de Recherche pour le Développement (IRD), Assistance Publique - Hôpitaux de Marseille (AP-HM), Marseille, France
- Institut Hospitalo-Universitaire (IHU) Méditerranée Infection, Marseille, France
- *Correspondence: Bernard La Scola,
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6
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Hannachi N, Arregle F, Lepidi H, Baudoin JP, Gouriet F, Martel H, Hubert S, Desnues B, Riberi A, Casalta JP, Habib G, Camoin-Jau L. A Massive Number of Extracellular Tropheryma whipplei in Infective Endocarditis: A Case Report and Literature Review. Front Immunol 2022; 13:900589. [PMID: 35844524 PMCID: PMC9278803 DOI: 10.3389/fimmu.2022.900589] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2022] [Accepted: 05/25/2022] [Indexed: 11/25/2022] Open
Abstract
Whipple’s disease (WD) is a chronic multisystemic infection caused by Tropheryma whipplei. If this bacterium presents an intracellular localization, associated with rare diseases and without pathognomonic signs, it is often subject to a misunderstanding of its physiopathology, often a misdiagnosis or simply an oversight. Here, we report the case of a patient treated for presumed rheumatoid arthritis. Recently, this patient presented to the hospital with infectious endocarditis. After surgery and histological analysis, we discovered the presence of T. whipplei. Electron microscopy allowed us to discover an atypical bacterial organization with a very large number of bacteria present in the extracellular medium in vegetation and valvular tissue. This atypical presentation we report here might be explained by the anti-inflammatory treatment administrated for our patient’s initial diagnosis of rheumatoid arthritis.
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Affiliation(s)
- Nadji Hannachi
- Aix Marseille Univ, IRD, APHM, MEPHI, IHU Méditerranée infection, Marseille, France
- Département de Pharmacie, Faculté de Médecine, Université Ferhat Abbas Sétif I, Sétif, Algeria
| | - Florent Arregle
- IHU Méditerranée Infection, département d'infectiologie, Marseille, France
- Département de cardiologie, la Timone Hospital, AP-HM, Marseille, France
| | - Hubert Lepidi
- Aix Marseille Univ, IRD, APHM, MEPHI, IHU Méditerranée infection, Marseille, France
- Laboratoire d’anatomie et de cytologie pathologique, la Timone Hospital, AP-HM, Marseille, France
| | - Jean-Pierre Baudoin
- Aix Marseille Univ, IRD, APHM, MEPHI, IHU Méditerranée infection, Marseille, France
| | - Frédérique Gouriet
- Aix Marseille Univ, IRD, APHM, MEPHI, IHU Méditerranée infection, Marseille, France
| | - Hélène Martel
- IHU Méditerranée Infection, département d'infectiologie, Marseille, France
- Département de cardiologie, la Timone Hospital, AP-HM, Marseille, France
| | - Sandrine Hubert
- Département de cardiologie, la Timone Hospital, AP-HM, Marseille, France
| | - Benoit Desnues
- Aix Marseille Univ, IRD, APHM, MEPHI, IHU Méditerranée infection, Marseille, France
| | - Alberto Riberi
- Department of Cardiac Surgery, La Timone Hospital, Marseille, France
| | - Jean-Paul Casalta
- Aix Marseille Univ, IRD, APHM, MEPHI, IHU Méditerranée infection, Marseille, France
| | - Gilbert Habib
- Aix Marseille Univ, IRD, APHM, MEPHI, IHU Méditerranée infection, Marseille, France
- Département de cardiologie, la Timone Hospital, AP-HM, Marseille, France
| | - Laurence Camoin-Jau
- Aix Marseille Univ, IRD, APHM, MEPHI, IHU Méditerranée infection, Marseille, France
- Laboratoire d’Hématologie, La Timone Hospital, APHM, Marseille, France
- *Correspondence: Laurence Camoin-Jau,
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7
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Osman IO, Garrec C, de Souza GAP, Zarubica A, Belhaouari DB, Baudoin JP, Lepidi H, Mege JL, Malissen B, Scola BL, Devaux CA. Control of CDH1/E-Cadherin Gene Expression and Release of a Soluble Form of E-Cadherin in SARS-CoV-2 Infected Caco-2 Intestinal Cells: Physiopathological Consequences for the Intestinal Forms of COVID-19. Front Cell Infect Microbiol 2022; 12:798767. [PMID: 35601094 PMCID: PMC9114883 DOI: 10.3389/fcimb.2022.798767] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2021] [Accepted: 03/22/2022] [Indexed: 12/19/2022] Open
Abstract
COVID-19 is the biggest pandemic the world has seen this century. Alongside the respiratory damage observed in patients with severe forms of the disease, gastrointestinal symptoms have been frequently reported. These symptoms (e.g., diarrhoea), sometimes precede the development of respiratory tract illnesses, as if the digestive tract was a major target during early SARS-CoV-2 dissemination. We hypothesize that in patients carrying intestinal SARS-CoV-2, the virus may trigger epithelial barrier damage through the disruption of E-cadherin (E-cad) adherens junctions, thereby contributing to the overall gastrointestinal symptoms of COVID-19. Here, we use an intestinal Caco-2 cell line of human origin which expresses the viral receptor/co-receptor as well as the membrane anchored cell surface adhesion protein E-cad to investigate the expression of E-cad after exposure to SARS-CoV-2. We found that the expression of CDH1/E-cad mRNA was significantly lower in cells infected with SARS-CoV-2 at 24 hours post-infection, compared to virus-free Caco-2 cells. The viral receptor ACE2 mRNA expression was specifically down-regulated in SARS-CoV-2-infected Caco-2 cells, while it remained stable in HCoV-OC43-infected Caco-2 cells, a virus which uses HLA class I instead of ACE2 to enter cells. It is worth noting that SARS-CoV-2 induces lower transcription of TMPRSS2 (involved in viral entry) and higher expression of B0AT1 mRNA (that encodes a protein known to co-express with ACE2 on intestinal cells). At 48 hours post-exposure to the virus, we also detected a small but significant increase of soluble E-cad protein (sE-cad) in the culture supernatant of SARS-CoV-2-infected Caco-2 cells. The increase of sE-cad release was also found in the intestinal HT29 cell line when infected by SARS-CoV-2. Beside the dysregulation of E-cad, SARS-CoV-2 infection of Caco-2 cells also leads to the dysregulation of other cell adhesion proteins (occludin, JAMA-A, zonulin, connexin-43 and PECAM-1). Taken together, these results shed light on the fact that infection of Caco-2 cells with SARS-CoV-2 affects tight-, adherens-, and gap-junctions. Moreover, intestinal tissues damage was associated to the intranasal SARS-CoV-2 infection in human ACE2 transgenic mice.
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Affiliation(s)
- Ikram Omar Osman
- Microbes Evolution Phylogeny and Infections (MEPHI), Institut de recherche pour le Développement (IRD), Assistance Publique Hôpitaux de Marseille (APHM), Institut Hospitalo-Universitaire (IHU)-Méditerranée Infection, Marseille, France
- Aix-Marseille Université, Marseille, France
| | - Clémence Garrec
- Microbes Evolution Phylogeny and Infections (MEPHI), Institut de recherche pour le Développement (IRD), Assistance Publique Hôpitaux de Marseille (APHM), Institut Hospitalo-Universitaire (IHU)-Méditerranée Infection, Marseille, France
- Aix-Marseille Université, Marseille, France
| | - Gabriel Augusto Pires de Souza
- Microbes Evolution Phylogeny and Infections (MEPHI), Institut de recherche pour le Développement (IRD), Assistance Publique Hôpitaux de Marseille (APHM), Institut Hospitalo-Universitaire (IHU)-Méditerranée Infection, Marseille, France
| | - Ana Zarubica
- Centre d’Immunophénomique (CIPHE), Aix Marseille Université, Institut National de la Santé et de la Recherche Médicale (INSERM), Centre National de la Recherche Scientifique (CNRS), CELPHEDIA, PHENOMIN, Marseille, France
| | - Djamal Brahim Belhaouari
- Microbes Evolution Phylogeny and Infections (MEPHI), Institut de recherche pour le Développement (IRD), Assistance Publique Hôpitaux de Marseille (APHM), Institut Hospitalo-Universitaire (IHU)-Méditerranée Infection, Marseille, France
- Aix-Marseille Université, Marseille, France
| | - Jean-Pierre Baudoin
- Microbes Evolution Phylogeny and Infections (MEPHI), Institut de recherche pour le Développement (IRD), Assistance Publique Hôpitaux de Marseille (APHM), Institut Hospitalo-Universitaire (IHU)-Méditerranée Infection, Marseille, France
| | - Hubert Lepidi
- Microbes Evolution Phylogeny and Infections (MEPHI), Institut de recherche pour le Développement (IRD), Assistance Publique Hôpitaux de Marseille (APHM), Institut Hospitalo-Universitaire (IHU)-Méditerranée Infection, Marseille, France
- Assitance Publique Hôpitaux de Marseille (APHM), Marseille, France
| | - Jean-Louis Mege
- Microbes Evolution Phylogeny and Infections (MEPHI), Institut de recherche pour le Développement (IRD), Assistance Publique Hôpitaux de Marseille (APHM), Institut Hospitalo-Universitaire (IHU)-Méditerranée Infection, Marseille, France
- Aix-Marseille Université, Marseille, France
- Assitance Publique Hôpitaux de Marseille (APHM), Marseille, France
| | - Bernard Malissen
- Centre d’Immunophénomique (CIPHE), Aix Marseille Université, Institut National de la Santé et de la Recherche Médicale (INSERM), Centre National de la Recherche Scientifique (CNRS), CELPHEDIA, PHENOMIN, Marseille, France
| | - Bernard La Scola
- Microbes Evolution Phylogeny and Infections (MEPHI), Institut de recherche pour le Développement (IRD), Assistance Publique Hôpitaux de Marseille (APHM), Institut Hospitalo-Universitaire (IHU)-Méditerranée Infection, Marseille, France
| | - Christian Albert Devaux
- Microbes Evolution Phylogeny and Infections (MEPHI), Institut de recherche pour le Développement (IRD), Assistance Publique Hôpitaux de Marseille (APHM), Institut Hospitalo-Universitaire (IHU)-Méditerranée Infection, Marseille, France
- Aix-Marseille Université, Marseille, France
- Centre National de la Recherche Scientifique (CNRS), Marseille, France
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8
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Brun S, Bestion E, Raymond E, Bassissi F, Jilkova ZM, Mezouar S, Rachid M, Novello M, Tracz J, Hamaï A, Lalmanach G, Vanderlynden L, Legouffe R, Stauber J, Schubert T, Plach MG, Courcambeck J, Drouot C, Jacquemot G, Serdjebi C, Roth G, Baudoin JP, Ansaldi C, Decaens T, Halfon P. GNS561, a clinical-stage PPT1 inhibitor, is efficient against hepatocellular carcinoma via modulation of lysosomal functions. Autophagy 2021; 18:678-694. [PMID: 34740311 PMCID: PMC9037544 DOI: 10.1080/15548627.2021.1988357] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Hepatocellular carcinoma is the most frequent primary liver cancer. Macroautophagy/autophagy inhibitors have been extensively studied in cancer but, to date, none has reached efficacy in clinical trials. In this study, we demonstrated that GNS561, a new autophagy inhibitor, whose anticancer activity was previously linked to lysosomal cell death, displayed high liver tropism and potent antitumor activity against a panel of human cancer cell lines and in two hepatocellular carcinoma in vivo models. We showed that due to its lysosomotropic properties, GNS561 could reach and specifically inhibited its enzyme target, PPT1 (palmitoyl-protein thioesterase 1), resulting in lysosomal unbound Zn2+ accumulation, impairment of cathepsin activity, blockage of autophagic flux, altered location of MTOR (mechanistic target of rapamycin kinase), lysosomal membrane permeabilization, caspase activation and cell death. Accordingly, GNS561, for which a global phase 1b clinical trial in liver cancers was just successfully achieved, represents a promising new drug candidate and a hopeful therapeutic strategy in cancer treatment. Abbreviations: ANXA5:annexin A5; ATCC: American type culture collection; BafA1: bafilomycin A1; BSA: bovine serum albumin; CASP3: caspase 3; CASP7: caspase 7; CASP8: caspase 8; CCND1: cyclin D1; CTSB: cathepsin B; CTSD: cathepsin D; CTSL: cathepsin L; CQ: chloroquine; iCCA: intrahepatic cholangiocarcinoma; DEN: diethylnitrosamine; DMEM: Dulbelcco’s modified Eagle medium; FBS: fetal bovine serum; FITC: fluorescein isothiocyanate; GAPDH: glyceraldehyde-3-phosphate dehydrogenase; HCC: hepatocellular carcinoma; HCQ: hydroxychloroquine; HDSF: hexadecylsulfonylfluoride; IC50: mean half-maximal inhibitory concentration; LAMP: lysosomal associated membrane protein; LC3-II: phosphatidylethanolamine-conjugated form of MAP1LC3; LMP: lysosomal membrane permeabilization; MALDI: matrix assisted laser desorption ionization; MAP1LC3/LC3: microtubule associated protein 1 light chain 3; MKI67: marker of proliferation Ki-67; MTOR: mechanistic target of rapamycin kinase; MRI: magnetic resonance imaging; NH4Cl: ammonium chloride; NtBuHA: N-tert-butylhydroxylamine; PARP: poly(ADP-ribose) polymerase; PBS: phosphate-buffered saline; PPT1: palmitoyl-protein thioesterase 1; SD: standard deviation; SEM: standard error mean; vs, versus; Zn2+: zinc ion; Z-Phe: Z-Phe-Tyt(tBu)-diazomethylketone; Z-VAD-FMK: carbobenzoxy-valyl-alanyl-aspartyl-[O-methyl]- fluoromethylketone.
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Affiliation(s)
| | - Eloïne Bestion
- Genoscience Pharma, Marseille, France.,Aix-Marseille Univ, MEPHI, APHM, IRD, IHU Méditerranée Infection, Marseille, France
| | - Eric Raymond
- Genoscience Pharma, Marseille, France.,Medical Oncology, Paris Saint-Joseph Hospital, Paris, France
| | | | - Zuzana Macek Jilkova
- Institute for Advanced Biosciences, Research Center UGA/Inserm U 1209/CNRS 5309, La Tronche, France.,University of Grenoble Alpes, Faculté De Médecine, France.,Clinique Universitaire d'Hépato-gastroentérologie, Pôle Digidune, Chu Grenoble, France
| | | | | | | | | | - Ahmed Hamaï
- Institut Necker-Enfants Malades, Inserm U1151-CNRS UMR, Paris, France.,University of Paris Descartes-Sorbonne Paris Cité, Paris, France
| | - Gilles Lalmanach
- Inserm, UMR1100, Centre d'Etude Des Pathologies Respiratoires, Equipe "Mécanismes Protéolytiques Dans l'Inflammation", Tours, France.,University of Tours, Tours, France
| | - Lise Vanderlynden
- Inserm, UMR1100, Centre d'Etude Des Pathologies Respiratoires, Equipe "Mécanismes Protéolytiques Dans l'Inflammation", Tours, France.,University of Tours, Tours, France
| | | | | | | | | | | | | | | | | | - Gael Roth
- Institute for Advanced Biosciences, Research Center UGA/Inserm U 1209/CNRS 5309, La Tronche, France.,University of Grenoble Alpes, Faculté De Médecine, France.,Clinique Universitaire d'Hépato-gastroentérologie, Pôle Digidune, Chu Grenoble, France
| | - Jean-Pierre Baudoin
- Aix-Marseille Univ, MEPHI, APHM, IRD, IHU Méditerranée Infection, Marseille, France
| | | | - Thomas Decaens
- Institute for Advanced Biosciences, Research Center UGA/Inserm U 1209/CNRS 5309, La Tronche, France.,University of Grenoble Alpes, Faculté De Médecine, France.,Clinique Universitaire d'Hépato-gastroentérologie, Pôle Digidune, Chu Grenoble, France
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9
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Otmani Idrissi M, Baudoin JP, Chateau AL, Aherfi S, Bedotto-Buffet M, Latil A, Lepidi H, Chiaroni J, Picard C, Mege JL, La Scola B, Mezouar S. Presence of SARS-CoV-2 in a Cornea Transplant. Pathogens 2021; 10:pathogens10080934. [PMID: 34451398 PMCID: PMC8401771 DOI: 10.3390/pathogens10080934] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2021] [Revised: 07/15/2021] [Accepted: 07/22/2021] [Indexed: 11/23/2022] Open
Abstract
Background: The SARS-CoV-2 pandemic has impacted tissue transplantation procedures since conjunctivas were found to be associated with coronavirus infection. Here, we investigated infection of a cornea graft from a COVID-19-positive donor. Methods: In order to evaluate the presence of SARS-CoV-2 in the cornea graft we first carried out a qRT-PCR and then we investigated the presence of SARS-CoV-2 by fluorescence and electron microscopy. Conclusions: Although the cornea graft was found to be negative by qRT-PCR, we were able to show the presence of SARS-CoV-2 in corneal cells expressing the SARS-CoV-2 receptor, ACE2. Taken together, our findings may have important implications for the use of corneal tissue in graft indications and open the debate on SARS-CoV-2 transmissibility.
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Affiliation(s)
- Myriem Otmani Idrissi
- Aix-Marseille University, MEPHI, IRD, APHM, 13005 Marseille, France; (M.O.I.); (J.-P.B.); (S.A.); (M.B.-B.); (H.L.); (J.-L.M.)
- IHU-Méditerranée Infection, 13005 Marseille, France
| | - Jean-Pierre Baudoin
- Aix-Marseille University, MEPHI, IRD, APHM, 13005 Marseille, France; (M.O.I.); (J.-P.B.); (S.A.); (M.B.-B.); (H.L.); (J.-L.M.)
- IHU-Méditerranée Infection, 13005 Marseille, France
| | - Anne-Line Chateau
- EFS Provence Alpes Côte d’Azur Corse, 13005 Marseille, France; (A.-L.C.); (J.C.); (C.P.)
| | - Sarah Aherfi
- Aix-Marseille University, MEPHI, IRD, APHM, 13005 Marseille, France; (M.O.I.); (J.-P.B.); (S.A.); (M.B.-B.); (H.L.); (J.-L.M.)
- IHU-Méditerranée Infection, 13005 Marseille, France
| | - Marielle Bedotto-Buffet
- Aix-Marseille University, MEPHI, IRD, APHM, 13005 Marseille, France; (M.O.I.); (J.-P.B.); (S.A.); (M.B.-B.); (H.L.); (J.-L.M.)
- IHU-Méditerranée Infection, 13005 Marseille, France
| | - Alain Latil
- CH d’Antibes-Juan Les Pins, 06160 Antibes, France;
| | - Hubert Lepidi
- Aix-Marseille University, MEPHI, IRD, APHM, 13005 Marseille, France; (M.O.I.); (J.-P.B.); (S.A.); (M.B.-B.); (H.L.); (J.-L.M.)
- IHU-Méditerranée Infection, 13005 Marseille, France
| | - Jacques Chiaroni
- EFS Provence Alpes Côte d’Azur Corse, 13005 Marseille, France; (A.-L.C.); (J.C.); (C.P.)
- Aix-Marseille University, EFS, CNRS, ADES, 13005 Marseille, France
| | - Christophe Picard
- EFS Provence Alpes Côte d’Azur Corse, 13005 Marseille, France; (A.-L.C.); (J.C.); (C.P.)
- Aix-Marseille University, EFS, CNRS, ADES, 13005 Marseille, France
| | - Jean-Louis Mege
- Aix-Marseille University, MEPHI, IRD, APHM, 13005 Marseille, France; (M.O.I.); (J.-P.B.); (S.A.); (M.B.-B.); (H.L.); (J.-L.M.)
- IHU-Méditerranée Infection, 13005 Marseille, France
- CH d’Antibes-Juan Les Pins, 06160 Antibes, France;
| | - Bernard La Scola
- Aix-Marseille University, MEPHI, IRD, APHM, 13005 Marseille, France; (M.O.I.); (J.-P.B.); (S.A.); (M.B.-B.); (H.L.); (J.-L.M.)
- IHU-Méditerranée Infection, 13005 Marseille, France
- Correspondence: (B.L.S.); (S.M.); Tel.: +33-4-13-73-24-01 (B.L.S.)
| | - Soraya Mezouar
- Aix-Marseille University, MEPHI, IRD, APHM, 13005 Marseille, France; (M.O.I.); (J.-P.B.); (S.A.); (M.B.-B.); (H.L.); (J.-L.M.)
- IHU-Méditerranée Infection, 13005 Marseille, France
- Correspondence: (B.L.S.); (S.M.); Tel.: +33-4-13-73-24-01 (B.L.S.)
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10
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Sahmi-Bounsiar D, Baudoin JP, Hannat S, Decloquement P, Chabrieres E, Aherfi S, La Scola B. Generation of Infectious Mimivirus Virions Through Inoculation of Viral DNA Within Acanthamoeba castellanii Shows Involvement of Five Proteins, Essentially Uncharacterized. Front Microbiol 2021; 12:677847. [PMID: 34305841 PMCID: PMC8299487 DOI: 10.3389/fmicb.2021.677847] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Accepted: 06/08/2021] [Indexed: 11/13/2022] Open
Abstract
One of the most curious findings associated with the discovery of Acanthamoeba polyphaga mimivirus (APMV) was the presence of many proteins and RNAs within the virion. Although some hypotheses on their role in Acanthamoeba infection have been put forward, none have been validated. In this study, we directly transfected mimivirus DNA with or without additional proteinase K treatment to extracted DNA into Acanthamoeba castellanii. In this way, it was possible to generate infectious APMV virions, but only without extra proteinase K treatment of extracted DNA. The virus genomes before and after transfection were identical. We searched for the remaining DNA-associated proteins that were digested by proteinase K and could visualize at least five putative proteins. Matrix-assisted laser desorption/ionization time-of-flight and liquid chromatography–mass spectrometry comparison with protein databases allowed the identification of four hypothetical proteins—L442, L724, L829, and R387—and putative GMC-type oxidoreductase R135. We believe that L442 plays a major role in this protein–DNA interaction. In the future, expression in vectors and then diffraction of X-rays by protein crystals could help reveal the exact structure of this protein and its precise role.
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Affiliation(s)
- Dehia Sahmi-Bounsiar
- IHU Méditerranée Infection, Marseille, France.,Aix-Marseille Université, Institut de Recherche pour le Développement (IRD), Assistance Publique- Hôpitaux de Marseille (AP-HM), MEPHI, Marseille, France
| | - Jean-Pierre Baudoin
- IHU Méditerranée Infection, Marseille, France.,Aix-Marseille Université, Institut de Recherche pour le Développement (IRD), Assistance Publique- Hôpitaux de Marseille (AP-HM), MEPHI, Marseille, France
| | - Sihem Hannat
- IHU Méditerranée Infection, Marseille, France.,Aix-Marseille Université, Institut de Recherche pour le Développement (IRD), Assistance Publique- Hôpitaux de Marseille (AP-HM), MEPHI, Marseille, France
| | - Philippe Decloquement
- IHU Méditerranée Infection, Marseille, France.,Aix-Marseille Université, Institut de Recherche pour le Développement (IRD), Assistance Publique- Hôpitaux de Marseille (AP-HM), MEPHI, Marseille, France
| | - Eric Chabrieres
- IHU Méditerranée Infection, Marseille, France.,Aix-Marseille Université, Institut de Recherche pour le Développement (IRD), Assistance Publique- Hôpitaux de Marseille (AP-HM), MEPHI, Marseille, France
| | - Sarah Aherfi
- IHU Méditerranée Infection, Marseille, France.,Aix-Marseille Université, Institut de Recherche pour le Développement (IRD), Assistance Publique- Hôpitaux de Marseille (AP-HM), MEPHI, Marseille, France
| | - Bernard La Scola
- IHU Méditerranée Infection, Marseille, France.,Aix-Marseille Université, Institut de Recherche pour le Développement (IRD), Assistance Publique- Hôpitaux de Marseille (AP-HM), MEPHI, Marseille, France
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11
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Pires de Souza GA, Osman IO, Le Bideau M, Baudoin JP, Jaafar R, Devaux C, La Scola B. Angiotensin II Receptor Blockers (ARBs Antihypertensive Agents) Increase Replication of SARS-CoV-2 in Vero E6 Cells. Front Cell Infect Microbiol 2021; 11:639177. [PMID: 34178717 PMCID: PMC8231006 DOI: 10.3389/fcimb.2021.639177] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2020] [Accepted: 05/21/2021] [Indexed: 01/08/2023] Open
Abstract
Several comorbidities, including hypertension, have been associated with an increased risk of developing severe disease during SARS-CoV-2 infection. Angiotensin II receptor blockers (ARBs) are currently some of the most widely-used drugs to control blood pressure by acting on the angiotensin II type 1 receptor (AT1R). ARBs have been reported to trigger the modulation of the angiotensin I converting enzyme 2 (ACE2), the receptor used by the virus to penetrate susceptible cells, raising concern that such treatments may promote virus capture and increase their viral load in patients receiving ARBs therapy. In this in vitro study, we reviewed the effect of ARBs on ACE2 and AT1R expression and investigated whether treatment of permissive ACE2+/AT1R+ Vero E6 cells with ARBs alters SARS-CoV-2 replication in vitro in an angiotensin II-free system. After treating the cells with the ARBs, we observed an approximate 50% relative increase in SARS-CoV-2 production in infected Vero E6 cells that correlates with the ARBs-induced up-regulation of ACE2 expression. From this data, we believe that the use of ARBs in hypertensive patients infected by SARS-CoV-2 should be carefully evaluated.
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Affiliation(s)
- Gabriel Augusto Pires de Souza
- Aix-Marseille Université, Institut de Recherche pour le Développement (IRD), Assistance Publique - Hôpitaux de Marseille (AP-HM), MEPHI, Marseille, France.,Microbes, Evolution, Phylogénie et Infection (MEPHI), IHU - Méditerranée Infection, Marseille, France
| | - Ikram Omar Osman
- Aix-Marseille Université, Institut de Recherche pour le Développement (IRD), Assistance Publique - Hôpitaux de Marseille (AP-HM), MEPHI, Marseille, France.,Microbes, Evolution, Phylogénie et Infection (MEPHI), IHU - Méditerranée Infection, Marseille, France
| | - Marion Le Bideau
- Aix-Marseille Université, Institut de Recherche pour le Développement (IRD), Assistance Publique - Hôpitaux de Marseille (AP-HM), MEPHI, Marseille, France.,Microbes, Evolution, Phylogénie et Infection (MEPHI), IHU - Méditerranée Infection, Marseille, France
| | - Jean-Pierre Baudoin
- Aix-Marseille Université, Institut de Recherche pour le Développement (IRD), Assistance Publique - Hôpitaux de Marseille (AP-HM), MEPHI, Marseille, France.,Microbes, Evolution, Phylogénie et Infection (MEPHI), IHU - Méditerranée Infection, Marseille, France
| | - Rita Jaafar
- Aix-Marseille Université, Institut de Recherche pour le Développement (IRD), Assistance Publique - Hôpitaux de Marseille (AP-HM), MEPHI, Marseille, France.,Microbes, Evolution, Phylogénie et Infection (MEPHI), IHU - Méditerranée Infection, Marseille, France
| | - Christian Devaux
- Aix-Marseille Université, Institut de Recherche pour le Développement (IRD), Assistance Publique - Hôpitaux de Marseille (AP-HM), MEPHI, Marseille, France.,Microbes, Evolution, Phylogénie et Infection (MEPHI), IHU - Méditerranée Infection, Marseille, France.,Centre National de La Recherche Scientifique (CNRS), Marseille, France
| | - Bernard La Scola
- Aix-Marseille Université, Institut de Recherche pour le Développement (IRD), Assistance Publique - Hôpitaux de Marseille (AP-HM), MEPHI, Marseille, France.,Microbes, Evolution, Phylogénie et Infection (MEPHI), IHU - Méditerranée Infection, Marseille, France
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12
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Le Bideau M, Wurtz N, Baudoin JP, La Scola B. Innovative Approach to Fast Electron Microscopy Using the Example of a Culture of Virus-Infected Cells: An Application to SARS-CoV-2. Microorganisms 2021; 9:microorganisms9061194. [PMID: 34073053 PMCID: PMC8228702 DOI: 10.3390/microorganisms9061194] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2021] [Revised: 05/27/2021] [Accepted: 05/27/2021] [Indexed: 12/23/2022] Open
Abstract
Despite the development of new diagnostic methods, co-culture, based on sample inoculation of cell monolayers coupled with electron microscopy (EM) observation, remains the gold standard in virology. Indeed, co-culture allows for the study of cell morphology (infected and not infected), the ultrastructure of the inoculated virus, and the different steps of the virus infectious cycle. Most EM methods for studying virus cycles are applied after infected cells are produced in large quantities and detached to obtain a pellet. Here, cell culture was performed in sterilized, collagen-coated single-break strip wells. After one day in culture, cells were infected with SARS-CoV-2. Wells of interest were fixed at different time points, from 2 to 36 h post-infection. Microwave-assisted resin embedding was accomplished directly in the wells in 4 h. Finally, ultra-thin sections were cut directly through the infected-cell monolayers. Our methodology requires, in total, less than four days for preparing and observing cells. Furthermore, by observing undetached infected cell monolayers, we were able to observe new ultrastructural findings, such as cell–cell interactions and baso-apical cellular organization related to the virus infectious cycle. Our innovative methodology thus not only saves time for preparation but also adds precision and new knowledge about viral infection, as shown here for SARS-CoV-2.
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Affiliation(s)
- Marion Le Bideau
- Microbes, Evolution, Phylogeny and Infection (MEPHI), UM63, Institut de Recherche pour le Développement (IRD), Assistance Publique—Hôpitaux de Marseille (AP-HM), Aix-Marseille University, 13005 Marseille, France; (M.L.B.); (N.W.)
| | - Nathalie Wurtz
- Microbes, Evolution, Phylogeny and Infection (MEPHI), UM63, Institut de Recherche pour le Développement (IRD), Assistance Publique—Hôpitaux de Marseille (AP-HM), Aix-Marseille University, 13005 Marseille, France; (M.L.B.); (N.W.)
- IHU Méditerranée Infection, 13005 Marseille, France
| | - Jean-Pierre Baudoin
- Microbes, Evolution, Phylogeny and Infection (MEPHI), UM63, Institut de Recherche pour le Développement (IRD), Assistance Publique—Hôpitaux de Marseille (AP-HM), Aix-Marseille University, 13005 Marseille, France; (M.L.B.); (N.W.)
- Correspondence: (J.-P.B.); (B.L.S.)
| | - Bernard La Scola
- Microbes, Evolution, Phylogeny and Infection (MEPHI), UM63, Institut de Recherche pour le Développement (IRD), Assistance Publique—Hôpitaux de Marseille (AP-HM), Aix-Marseille University, 13005 Marseille, France; (M.L.B.); (N.W.)
- IHU Méditerranée Infection, 13005 Marseille, France
- Correspondence: (J.-P.B.); (B.L.S.)
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13
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Brahim Belhaouari D, Wurtz N, Grimaldier C, Lacoste A, Pires de Souza GA, Penant G, Hannat S, Baudoin JP, La Scola B. Microscopic Observation of SARS-Like Particles in RT-qPCR SARS-CoV-2 Positive Sewage Samples. Pathogens 2021; 10:516. [PMID: 33923138 PMCID: PMC8146039 DOI: 10.3390/pathogens10050516] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2021] [Revised: 04/20/2021] [Accepted: 04/21/2021] [Indexed: 12/18/2022] Open
Abstract
The ongoing outbreak of novel coronavirus pneumonia (COVID-19) caused by SARS-CoV-2 infection has spread rapidly worldwide. The major transmission routes of SARS-CoV-2 are recognised as inhalation of aerosol/droplets and person-to-person contact. However, some studies have demonstrated that live SARS-CoV-2 can be isolated from the faeces and urine of infected patients, which can then enter the wastewater system. The currently available evidence indicates that the viral RNA present in wastewater may become a potential source of epidemiological data. However, to investigate whether wastewater may present a risk to humans such as sewage workers, we investigated whether intact particles of SARS-CoV-2 were observable and whether it was possible to isolate the virus in wastewater. Using a correlative strategy of light microscopy and electron microscopy (CLEM), we demonstrated the presence of intact and degraded SARS-like particles in RT-qPCR SARS-CoV-2-positive sewage sample collected in the city of Marseille. However, the viral infectivity assessment of SARS-CoV-2 in the wastewater was inconclusive, due to the presence of other viruses known to be highly resistant in the environment such as enteroviruses, rhinoviruses, and adenoviruses. Although the survival and the infectious risk of SARS-CoV-2 in wastewater cannot be excluded from our study, additional work may be required to investigate the stability, viability, fate, and decay mechanisms of SARS-CoV-2 thoroughly in wastewater.
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Affiliation(s)
- Djamal Brahim Belhaouari
- Microbes, Evolution, Phylogeny and Infection (MEPHI), UM63, Institut de Recherche pour le Développement (IRD), Aix- Marseille University, 13005 Marseille, France; (D.B.B.); (N.W.); (G.A.P.d.S.); (S.H.)
- IHU Méditerranée Infection, 13005 Marseille, France
| | - Nathalie Wurtz
- Microbes, Evolution, Phylogeny and Infection (MEPHI), UM63, Institut de Recherche pour le Développement (IRD), Aix- Marseille University, 13005 Marseille, France; (D.B.B.); (N.W.); (G.A.P.d.S.); (S.H.)
- IHU Méditerranée Infection, 13005 Marseille, France
| | - Clio Grimaldier
- Assistance Publique—Hôpitaux de Marseille, 13005 Marseille, France; (C.G.); (G.P.)
| | - Alexandre Lacoste
- Bataillon des Marins Pompiers de Marseille, 13003 Marseille, France;
| | - Gabriel Augusto Pires de Souza
- Microbes, Evolution, Phylogeny and Infection (MEPHI), UM63, Institut de Recherche pour le Développement (IRD), Aix- Marseille University, 13005 Marseille, France; (D.B.B.); (N.W.); (G.A.P.d.S.); (S.H.)
- IHU Méditerranée Infection, 13005 Marseille, France
| | - Gwilherm Penant
- Assistance Publique—Hôpitaux de Marseille, 13005 Marseille, France; (C.G.); (G.P.)
| | - Sihem Hannat
- Microbes, Evolution, Phylogeny and Infection (MEPHI), UM63, Institut de Recherche pour le Développement (IRD), Aix- Marseille University, 13005 Marseille, France; (D.B.B.); (N.W.); (G.A.P.d.S.); (S.H.)
- IHU Méditerranée Infection, 13005 Marseille, France
| | - Jean-Pierre Baudoin
- Assistance Publique—Hôpitaux de Marseille, 13005 Marseille, France; (C.G.); (G.P.)
| | - Bernard La Scola
- Microbes, Evolution, Phylogeny and Infection (MEPHI), UM63, Institut de Recherche pour le Développement (IRD), Aix- Marseille University, 13005 Marseille, France; (D.B.B.); (N.W.); (G.A.P.d.S.); (S.H.)
- IHU Méditerranée Infection, 13005 Marseille, France
- Assistance Publique—Hôpitaux de Marseille, 13005 Marseille, France; (C.G.); (G.P.)
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14
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Valera G, Markov DA, Bijari K, Randlett O, Asgharsharghi A, Baudoin JP, Ascoli GA, Portugues R, López-Schier H. A neuronal blueprint for directional mechanosensation in larval zebrafish. Curr Biol 2021; 31:1463-1475.e6. [PMID: 33545047 DOI: 10.1016/j.cub.2021.01.045] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [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: 08/14/2019] [Revised: 11/30/2020] [Accepted: 01/13/2021] [Indexed: 01/02/2023]
Abstract
Animals have a remarkable ability to use local cues to orient in space in the absence of a panoramic fixed reference frame. Here we use the mechanosensory lateral line in larval zebrafish to understand rheotaxis, an innate oriented swimming evoked by water currents. We generated a comprehensive light-microscopy cell-resolution projectome of lateralis afferent neurons (LANs) and used clustering techniques for morphological classification. We find surprising structural constancy among LANs. Laser-mediated microlesions indicate that precise topographic mapping of lateral-line receptors is not essential for rheotaxis. Recording neuronal-activity during controlled mechanical stimulation of neuromasts reveals unequal representation of water-flow direction in the hindbrain. We explored potential circuit architectures constrained by anatomical and functional data to suggest a parsimonious model under which the integration of lateralized signals transmitted by direction-selective LANs underlies the encoding of water-flow direction in the brain. These data provide a new framework to understand how animals use local mechanical cues to orient in space.
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Affiliation(s)
- Gema Valera
- Sensory Biology and Organogenesis, Helmholtz Zentrum Munich, Germany
| | | | - Kayvan Bijari
- Krasnow Institute for Advanced Study, George Mason University, VA, USA
| | - Owen Randlett
- Department of Molecular and Cellular Biology, Harvard University, MA, USA
| | | | | | - Giorgio A Ascoli
- Krasnow Institute for Advanced Study, George Mason University, VA, USA
| | | | - Hernán López-Schier
- Sensory Biology and Organogenesis, Helmholtz Zentrum Munich, Germany; Centre for Genomic Regulation, Barcelona, Spain.
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15
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Halfon P, Bestion E, Zandi K, Andreani J, Baudoin JP, La Scola B, Mege JL, Mezouar S, Schinazi RF. GNS561 exhibits potent in vitro antiviral activity against SARS-CoV-2 through autophagy inhibition. bioRxiv 2020. [PMID: 33052342 DOI: 10.1101/2020.10.06.327635] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Since December 2019, severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2/2019-nCoV) has spread quickly worldwide, with more than 29 million cases and 920,000 deaths. Interestingly, coronaviruses were found to subvert and hijack the autophagic process to allow their viral replication. One of the spotlights had been focused on the autophagy inhibitors as a target mechanism effective in the inhibition of SARS-CoV-2 infection. Consequently, chloroquine (CQ) and hydroxychloroquine (HCQ), a derivative of CQ, was suggested as the first potentially be therapeutic strategies as they are known to be autophagy inhibitors. Then, they were used as therapeutics in SARS-CoV-2 infection along with remdesivir, for which the FDA approved emergency use authorization. Here, we investigated the antiviral activity and associated mechanism of GNS561, a small basic lipophilic molecule inhibitor of late-stage autophagy, against SARS-CoV-2. Our data indicated that GNS561 showed the highest antiviral effect for two SARS-CoV-2 strains compared to CQ and remdesivir. Focusing on the autophagy mechanism, we showed that GNS561, located in LAMP2-positive lysosomes, together with SARS-CoV-2, blocked autophagy by increasing the size of LC3-II spots and the accumulation of autophagic vacuoles in the cytoplasm with the presence of multilamellar bodies characteristic of a complexed autophagy. Finally, our study revealed that the combination of GNS561 and remdesivir was associated with a strong synergistic antiviral effect against SARS-CoV-2. Overall, our study highlights GNS561 as a powerful drug in SARS-CoV-2 infection and supports that the hypothesis that autophagy inhibitors could be an alternative strategy for SARS-CoV-2 infection.
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16
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Brahim Belhaouari D, Fontanini A, Baudoin JP, Haddad G, Le Bideau M, Bou Khalil JY, Raoult D, La Scola B. The Strengths of Scanning Electron Microscopy in Deciphering SARS-CoV-2 Infectious Cycle. Front Microbiol 2020; 11:2014. [PMID: 32973730 PMCID: PMC7466455 DOI: 10.3389/fmicb.2020.02014] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2020] [Accepted: 07/30/2020] [Indexed: 12/14/2022] Open
Abstract
Electron microscopy is a powerful tool in the field of microbiology. It has played a key role in the rapid diagnosis of viruses in patient samples and has contributed significantly to the clarification of virus structure and function, helping to guide the public health response to emerging viral infections. In the present study, we used scanning electron microscopy (SEM) to study the infectious cycle of SARS-CoV-2 in Vero E6 cells and we controlled some key findings by classical transmission electronic microscopy (TEM). The replication cycle of the virus was followed from 1 to 36 h post-infection. Our results revealed that SARS-CoV-2 infected the cells through membrane fusion. Particles are formed in the peri-nuclear region from a budding of the endoplasmic reticulum-Golgi apparatus complex into morphogenesis matrix vesicae. New SARS-CoV-2 particles were expelled from the cells, through cell lysis or by fusion of virus containing vacuoles with the cell plasma membrane. Overall, this cycle is highly comparable to that of SARS-CoV. By providing a detailed and complete SARS-CoV-2 infectious cycle, SEM proves to be a very rapid and efficient tool compared to classical TEM.
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Affiliation(s)
- Djamal Brahim Belhaouari
- Microbes, Evolution, Phylogeny and Infection (MEPHI), UM63, Institut de Recherche pour le Développement (IRD), Assistance Publique - Hôpitaux de Marseille (AP-HM), Aix-Marseille University, Marseille, France
| | | | - Jean-Pierre Baudoin
- Microbes, Evolution, Phylogeny and Infection (MEPHI), UM63, Institut de Recherche pour le Développement (IRD), Assistance Publique - Hôpitaux de Marseille (AP-HM), Aix-Marseille University, Marseille, France
| | - Gabriel Haddad
- Microbes, Evolution, Phylogeny and Infection (MEPHI), UM63, Institut de Recherche pour le Développement (IRD), Assistance Publique - Hôpitaux de Marseille (AP-HM), Aix-Marseille University, Marseille, France
| | - Marion Le Bideau
- Microbes, Evolution, Phylogeny and Infection (MEPHI), UM63, Institut de Recherche pour le Développement (IRD), Assistance Publique - Hôpitaux de Marseille (AP-HM), Aix-Marseille University, Marseille, France
| | | | - Didier Raoult
- Microbes, Evolution, Phylogeny and Infection (MEPHI), UM63, Institut de Recherche pour le Développement (IRD), Assistance Publique - Hôpitaux de Marseille (AP-HM), Aix-Marseille University, Marseille, France
| | - Bernard La Scola
- Microbes, Evolution, Phylogeny and Infection (MEPHI), UM63, Institut de Recherche pour le Développement (IRD), Assistance Publique - Hôpitaux de Marseille (AP-HM), Aix-Marseille University, Marseille, France.,IHU Méditerranée Infection, Marseille, France
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17
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Hannachi N, Lepidi H, Fontanini A, Takakura T, Bou-Khalil J, Gouriet F, Habib G, Raoult D, Camoin-Jau L, Baudoin JP. A Novel Approach for Detecting Unique Variations among Infectious Bacterial Species in Endocarditic Cardiac Valve Vegetation. Cells 2020; 9:cells9081899. [PMID: 32823780 PMCID: PMC7464176 DOI: 10.3390/cells9081899] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Revised: 08/11/2020] [Accepted: 08/12/2020] [Indexed: 12/25/2022] Open
Abstract
Infectious endocarditis (IE) remains one of the deadliest heart diseases with a high death rate, generally following thrombo-embolic events. Today, therapy is based on surgery and antibiotic therapy. When thromboembolic complications in IE patients persist, this is often due to our lack of knowledge regarding the pathophysiological development and organization of cells in the vegetation, most notably the primordial role of platelets and further triggered hemostasis, which is related to the diversity of infectious microorganisms involved. Our objective was to study the organization of IE vegetations due to different bacteria species in order to understand the related pathophysiological mechanism of vegetation development. We present an approach for ultrastructural analysis of whole-infected heart valve tissue based on scanning electron microscopy and energy-dispersive X-ray spectroscopy. Our approach allowed us to detect differences in cell organization between the analyzed vegetations and revealed a distinct chemical feature in viridans Streptococci ones. Our results illustrate the benefits that such an approach may bring for guiding therapy, considering the germ involved for each IE patient.
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Affiliation(s)
- Nadji Hannachi
- Aix Marseille Univ, IRD, APHM, MEPHI, IHU Méditerranée Infection, 13005 Marseille, France; (N.H.); (A.F.); (J.B.-K.); (F.G.); (D.R.); (L.C.-J.)
| | - Hubert Lepidi
- Laboratoire D’anatomie et de Cytologie Pathologique, Hôpital de la Timone, AP-HM, boulevard Jean-Moulin, 13005 Marseille, France;
| | - Anthony Fontanini
- Aix Marseille Univ, IRD, APHM, MEPHI, IHU Méditerranée Infection, 13005 Marseille, France; (N.H.); (A.F.); (J.B.-K.); (F.G.); (D.R.); (L.C.-J.)
| | - Tatsuki Takakura
- Hitachi High-Tech Corporation, Analytical & Medical Solution Business Group 882 Ichige, Hitachinaka-shi, Ibaraki-ken 312-8504, Japan;
| | - Jacques Bou-Khalil
- Aix Marseille Univ, IRD, APHM, MEPHI, IHU Méditerranée Infection, 13005 Marseille, France; (N.H.); (A.F.); (J.B.-K.); (F.G.); (D.R.); (L.C.-J.)
| | - Frédérique Gouriet
- Aix Marseille Univ, IRD, APHM, MEPHI, IHU Méditerranée Infection, 13005 Marseille, France; (N.H.); (A.F.); (J.B.-K.); (F.G.); (D.R.); (L.C.-J.)
| | - Gilbert Habib
- Département de Cardiologie, Hôpital de la Timone, AP-HM, Boulevard Jean-Moulin, 13005 Marseille, France;
| | - Didier Raoult
- Aix Marseille Univ, IRD, APHM, MEPHI, IHU Méditerranée Infection, 13005 Marseille, France; (N.H.); (A.F.); (J.B.-K.); (F.G.); (D.R.); (L.C.-J.)
| | - Laurence Camoin-Jau
- Aix Marseille Univ, IRD, APHM, MEPHI, IHU Méditerranée Infection, 13005 Marseille, France; (N.H.); (A.F.); (J.B.-K.); (F.G.); (D.R.); (L.C.-J.)
- Laboratoire D’Hématologie, Hôpital de la Timone, APHM, Boulevard Jean- Moulin, 13005 Marseille, France
| | - Jean-Pierre Baudoin
- Aix Marseille Univ, IRD, APHM, MEPHI, IHU Méditerranée Infection, 13005 Marseille, France; (N.H.); (A.F.); (J.B.-K.); (F.G.); (D.R.); (L.C.-J.)
- Correspondence: ; Tel.: +33-4-1373-2401; Fax: +33-4-1373-2402
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18
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Baudoin JP, Camoin-Jau L, Prasanth A, Habib G, Lepidi H, Hannachi N. Ultrastructure of a late-stage bacterial endocarditis valve vegetation. J Thromb Thrombolysis 2020; 51:821-826. [PMID: 32749620 DOI: 10.1007/s11239-020-02232-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Infective endocarditis (IE) remains a severe illness with high mortality rate, despite advances in antibiotic therapy and cardiac surgery. If infectious bacteria and platelets are two key players of human IE vegetation developmental process, their interactions and respective roles in fully developed late-stage IE vegetations remain obscure. The objective of this study was to better understand the organization of the different components of the IE vegetation and to provide a detailed description of this vegetation ultrastructure. A late stage Staphylococcal endocarditic vegetation was provided from a 13 years teenager patient. After reception of the surgical piece, we carried out a histological study using routine methods, notably the hematoxylin-eosin-saffron staining. Labeling with the anti-CD 61 antibody was also carried out. In a second step, we used transmission electron microscopy to describe the different regions making up the vegetation. Our ultrastructural study revealed vegetation was clearly composed by three different regions and identified the specific location of the bacteria and platelets in the vegetation tissues. Histological analysis showed that platelets and Staphylococcus aureus were not co-localized. Electron microscopy study confirmed that S. aureus were found at distance from platelets, as well from immune cells, embedded in a biofilm and/or a necrotic area. These results reveal a development of a deep bacteria-only niche in vegetation, raising questions about medication access to these microorganisms. Vegetation composed of three regions: a region rich in bacteria incorporated into the necrotic tissue, the second region composed of fibrin filaments and the third region rich in platelets and free of bacteria.
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Affiliation(s)
- Jean-Pierre Baudoin
- Aix Marseille Univ, IRD, APHM, MEPHI, IHU Méditerranée Infection, 19-21 Boulevard Jean Moulin, 13385, Marseille Cedex 05, France
| | - Laurence Camoin-Jau
- Aix Marseille Univ, IRD, APHM, MEPHI, IHU Méditerranée Infection, 19-21 Boulevard Jean Moulin, 13385, Marseille Cedex 05, France. .,Laboratoire d'Hématologie, Hôpital de la Timone, APHM, Boulevard Jean-Moulin, 13005, Marseille, France.
| | - Arsha Prasanth
- Aix Marseille Univ, IRD, APHM, MEPHI, IHU Méditerranée Infection, 19-21 Boulevard Jean Moulin, 13385, Marseille Cedex 05, France
| | - Gilbert Habib
- Aix Marseille Univ, IRD, APHM, MEPHI, IHU Méditerranée Infection, 19-21 Boulevard Jean Moulin, 13385, Marseille Cedex 05, France.,Département de cardiologie, Hôpital de la Timone, AP-HM, Boulevard Jean-Moulin, 13005, Marseille, France
| | - Hubert Lepidi
- Aix Marseille Univ, IRD, APHM, MEPHI, IHU Méditerranée Infection, 19-21 Boulevard Jean Moulin, 13385, Marseille Cedex 05, France.,Laboratoire d'anatomie et de cytologie pathologique, Hôpital de la Timone, AP-HM, Boulevard Jean-Moulin, 13005, Marseille, France
| | - Nadji Hannachi
- Aix Marseille Univ, IRD, APHM, MEPHI, IHU Méditerranée Infection, 19-21 Boulevard Jean Moulin, 13385, Marseille Cedex 05, France
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19
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Diop K, Cadoret F, Nguyen TT, Baudoin JP, Armstrong N, Raoult D, Bretelle F, Fournier PE, Fenollar F. Vaginimicrobium propionicum gen. nov., sp. nov., a novel propionic acid bacterium derived from human vaginal discharge. Int J Syst Evol Microbiol 2020; 70:4091-4097. [PMID: 32628103 DOI: 10.1099/ijsem.0.004106] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
A Gram-stain-positive anaerobic rod-shaped bacterium, designated strain Marseille-P3275T, was isolated using culturomics from the vaginal discharge of healthy French woman. Marseille-P3275T was non-motile and did not form spores. Cells had neither catalase nor oxidase activity. The major fatty acids were C16 : 0 (29 %), C18:1ω9 (18 %), and iso-C15 : 0 (17 %). The genomic DNA G+C content was 50.64 mol%. The phylogenetic analysis based on 16S rRNA gene sequence indicated that Marseille-P3275T was related to members of the family Propionibacteriaceae (between 90.32-92.92 % sequence similarity) with formation of a clade with the monospecific genus Propionimicrobium (type species Propionimicrobium lymphophilum). On the basis of these phylogenetic and phenotypic differences, Marseille-P3275T was classified in a novel genus, Vaginimicrobium, as Vaginimicrobium propionicum gen. nov., sp. nov. The type strain is Marseille-P3275T (=CSUR P3275T=CECT 9677T).
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Affiliation(s)
- Khoudia Diop
- IHU-Méditerranée Infection, Marseille, France.,Aix-Marseille Univ, IRD, AP-HM, SSA, VITROME, Marseille, France
| | - Frederic Cadoret
- Aix-Marseille Univ, IRD, AP-HM, MEPHI, Marseille, France.,IHU-Méditerranée Infection, Marseille, France
| | - Thi Tien Nguyen
- Aix-Marseille Univ, IRD, AP-HM, MEPHI, Marseille, France.,IHU-Méditerranée Infection, Marseille, France
| | - Jean-Pierre Baudoin
- Aix-Marseille Univ, IRD, AP-HM, MEPHI, Marseille, France.,IHU-Méditerranée Infection, Marseille, France
| | - Nicholas Armstrong
- Aix-Marseille Univ, IRD, AP-HM, MEPHI, Marseille, France.,IHU-Méditerranée Infection, Marseille, France
| | - Didier Raoult
- Special Infectious Agents Unit, King Fahd Medical Research Center, King Abdulaziz University, Jeddah, Saudi Arabia.,Aix-Marseille Univ, IRD, AP-HM, MEPHI, Marseille, France.,IHU-Méditerranée Infection, Marseille, France
| | - Florence Bretelle
- Department of Gynecology and Obstetrics, Gynépole, Hôpital Nord, AP-HM, Marseille, France.,Aix-Marseille Univ, IRD, AP-HM, MEPHI, Marseille, France.,IHU-Méditerranée Infection, Marseille, France
| | - Pierre-Edouard Fournier
- IHU-Méditerranée Infection, Marseille, France.,Aix-Marseille Univ, IRD, AP-HM, SSA, VITROME, Marseille, France
| | - Florence Fenollar
- Aix-Marseille Univ, IRD, AP-HM, SSA, VITROME, Marseille, France.,IHU-Méditerranée Infection, Marseille, France
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20
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Andreani J, Million M, Baudoin JP, Ominami Y, Khalil JYB, Frémond C, Khelaifia S, Levasseur A, Raoult D, La Scola B. Klenkia terrae resistant to DNA extraction in germ-free mice stools illustrates the extraction pitfall faced by metagenomics. Sci Rep 2020; 10:10228. [PMID: 32576848 PMCID: PMC7311423 DOI: 10.1038/s41598-020-66627-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2019] [Accepted: 05/14/2020] [Indexed: 11/09/2022] Open
Abstract
Over the past decade, metagenomics has become the preferred method for exploring complex microbiota such as human gut microbiota. However, several bias affecting the results of microbiota composition, such as those due to DNA extraction, have been reported. These bias have been confirmed with the development of culturomics technique. In the present study, we report the contamination of a gnotobiotic mice unit with a bacterium first detected by gram staining. Scanning electron microscopy and transmission electron microscopy permitted to detect a bacterium with a thick cell wall. However, in parallel, the first attempt to identify and culture this bacterium by gene amplification and metagenomics of universal 16S rRNA failed. Finally, the isolation in culture of a fastidious bacterium not detected by using universal PCR was successfully achieved by using a BCYE agar plate with CO2 atmosphere at 30 °C. We performed genome sequencing of this bacterium using a strong extraction procedure. The genomic comparison allowed us to classify this bacterium as Klenkia terrae. And finally, it was also detected in the stool and kibble that caused the contamination by using specific qPCR against this bacterium. The elucidation of this contamination provides additional evidence that DNA extraction could be a bias for the study of the microbiota. Currently, most studies that strive to analyze and compare the gut microbiota are based on metagenomics. In a gnotobiotic mice unit contaminated with the fastidious Actinobacteria Klenkia terrae, standard culture, 16S rRNA gene amplification and metagenomics failed to identify the micro-organism observed in stools by gram-staining. Only a procedure based on culturomics allowed us to identify this bacterium and to elucidate the mode of contamination of the gnotobiotic mice unit through diet.
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Affiliation(s)
- Julien Andreani
- Aix Marseille Univ, IRD, APHM, MEPHI, Marseille, France, Marseille, France
| | - Matthieu Million
- Aix Marseille Univ, IRD, APHM, MEPHI, Marseille, France, Marseille, France
| | | | - Yusuke Ominami
- Hitachi High-Technologies Corporation, Science & Medical Systems Business Group, 24-14, Nishi-shimbashi 1-chome, Minato-ku, Tokyo, 105-8717, Japan
| | | | - Cécile Frémond
- Phenomin-TAAM, UPS44, Centre National de la Recherche Scientifique, Orléans, France
| | - Saber Khelaifia
- Aix Marseille Univ, IRD, APHM, MEPHI, Marseille, France, Marseille, France
| | - Anthony Levasseur
- Aix Marseille Univ, IRD, APHM, MEPHI, Marseille, France, Marseille, France
| | - Didier Raoult
- Aix Marseille Univ, IRD, APHM, MEPHI, Marseille, France, Marseille, France.,Institut Hospitalo-Universitaire (IHU) - Méditerranée Infection, Marseille, France
| | - Bernard La Scola
- Aix Marseille Univ, IRD, APHM, MEPHI, Marseille, France, Marseille, France. .,Institut Hospitalo-Universitaire (IHU) - Méditerranée Infection, Marseille, France.
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21
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Hannachi N, Ogé-Ganaye E, Baudoin JP, Fontanini A, Bernot D, Habib G, Camoin-Jau L. Antiplatelet Agents Have a Distinct Efficacy on Platelet Aggregation Induced by Infectious Bacteria. Front Pharmacol 2020; 11:863. [PMID: 32581813 PMCID: PMC7291881 DOI: 10.3389/fphar.2020.00863] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2020] [Accepted: 05/26/2020] [Indexed: 02/01/2023] Open
Abstract
Platelets are the cornerstone of hemostasis. However, their exaggerated aggregation induces deleterious consequences. In several diseases, such as infectious endocarditis and sepsis, the interaction between platelets and bacteria leads to platelet aggregation. Despite platelet involvement, no antiplatelet therapy is currently recommended in these infectious diseases. We aimed here, to evaluate, in vitro, the effect of antiplatelet drugs on platelet aggregation induced by two of the bacterial pathogens most involved in infectious endocarditis, Staphylococcus aureus and Streptococcus sanguinis. Blood samples were collected from healthy donors (n = 43). Treated platelet rich plasmas were incubated with three bacterial strains of each species tested. Platelet aggregation was evaluated by Light Transmission Aggregometry. CD62P surface exposure was evaluated by flow cytometry. Aggregate organizations were analyzed by scanning electron microscopy. All the strains tested induced a strong platelet aggregation. Antiplatelet drugs showed distinct effects depending on the bacterial species involved with different magnitude between strains of the same species. Ticagrelor exhibited the highest inhibitory effect on platelet activation (p <0.001) and aggregation (p <0.01) induced by S. aureus. In the case of S. sanguinis, platelet activation and aggregation were better inhibited using the combination of both aspirin and ticagrelor (p <0.05 and p <0.001 respectively). Aggregates ultrastructure and effect of antiplatelet drugs observed by scanning electron microscopy depended on the species involved. Our results highlighted that the effect of antiplatelet drugs depended on the bacterial species involved. We might recommend therefore to consider the germ involved before introduction of an optimal antiplatelet therapy.
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Affiliation(s)
- Nadji Hannachi
- Aix Marseille Univ, IRD, APHM, MEPHI, IHU Méditerranée infection, Marseille, France
| | - Emma Ogé-Ganaye
- Aix Marseille Univ, IRD, APHM, MEPHI, IHU Méditerranée infection, Marseille, France.,Laboratoire d'Hématologie, Hôpital de la Timone, APHM, Boulevard Jean-Moulin, Marseille, France
| | - Jean-Pierre Baudoin
- Aix Marseille Univ, IRD, APHM, MEPHI, IHU Méditerranée infection, Marseille, France
| | - Anthony Fontanini
- Aix Marseille Univ, IRD, APHM, MEPHI, IHU Méditerranée infection, Marseille, France
| | - Denis Bernot
- Laboratoire d'Hématologie, Hôpital de la Timone, APHM, Boulevard Jean-Moulin, Marseille, France
| | - Gilbert Habib
- Aix Marseille Univ, IRD, APHM, MEPHI, IHU Méditerranée infection, Marseille, France.,Département de cardiologie, Hôpital de la Timone, AP-HM, Boulevard Jean-Moulin, Marseille, France
| | - Laurence Camoin-Jau
- Aix Marseille Univ, IRD, APHM, MEPHI, IHU Méditerranée infection, Marseille, France.,Laboratoire d'Hématologie, Hôpital de la Timone, APHM, Boulevard Jean-Moulin, Marseille, France
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22
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Colson P, Lagier JC, Baudoin JP, Bou Khalil J, La Scola B, Raoult D. Ultrarapid diagnosis, microscope imaging, genome sequencing, and culture isolation of SARS-CoV-2. Eur J Clin Microbiol Infect Dis 2020; 39:1601-1603. [PMID: 32270412 PMCID: PMC7138953 DOI: 10.1007/s10096-020-03869-w] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2020] [Accepted: 03/16/2020] [Indexed: 12/19/2022]
Affiliation(s)
- Philippe Colson
- IHU Méditerranée Infection, 19-21 Boulevard Jean Moulin, 13005, Marseille, France
- Microbes Evolution Phylogeny and Infections (MEPHI), Institut de Recherche pour le Développement (IRD), Assistance Publique - Hôpitaux de Marseille (AP-HM), Aix-Marseille University, 27 Boulevard Jean Moulin, 13005, Marseille, France
| | - Jean-Christophe Lagier
- IHU Méditerranée Infection, 19-21 Boulevard Jean Moulin, 13005, Marseille, France
- Microbes Evolution Phylogeny and Infections (MEPHI), Institut de Recherche pour le Développement (IRD), Assistance Publique - Hôpitaux de Marseille (AP-HM), Aix-Marseille University, 27 Boulevard Jean Moulin, 13005, Marseille, France
| | - Jean-Pierre Baudoin
- IHU Méditerranée Infection, 19-21 Boulevard Jean Moulin, 13005, Marseille, France
| | - Jacques Bou Khalil
- IHU Méditerranée Infection, 19-21 Boulevard Jean Moulin, 13005, Marseille, France
| | - Bernard La Scola
- IHU Méditerranée Infection, 19-21 Boulevard Jean Moulin, 13005, Marseille, France
- Microbes Evolution Phylogeny and Infections (MEPHI), Institut de Recherche pour le Développement (IRD), Assistance Publique - Hôpitaux de Marseille (AP-HM), Aix-Marseille University, 27 Boulevard Jean Moulin, 13005, Marseille, France
| | - Didier Raoult
- IHU Méditerranée Infection, 19-21 Boulevard Jean Moulin, 13005, Marseille, France.
- Microbes Evolution Phylogeny and Infections (MEPHI), Institut de Recherche pour le Développement (IRD), Assistance Publique - Hôpitaux de Marseille (AP-HM), Aix-Marseille University, 27 Boulevard Jean Moulin, 13005, Marseille, France.
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23
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Yimagou EK, Dione N, Ngom II, Tall ML, Baudoin JP, Raoult D, Khalil JYB. Parabacteroides bouchesdurhonensis sp. nov., a new bacterium isolated from the stool of a healthy adult. New Microbes New Infect 2019; 34:100639. [PMID: 31993208 PMCID: PMC6974780 DOI: 10.1016/j.nmni.2019.100639] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2019] [Accepted: 12/10/2019] [Indexed: 12/22/2022] Open
Abstract
Parabacteroides bouchesdurhonensis strain Marseille-P3763T (= CSURP3763) is a new species isolated from the stool of a heathy adult.
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Affiliation(s)
- E K Yimagou
- Aix Marseille Univ, IRD (Development Research Institute), AP-HM (Public Assistance of Marseille Hospitals), MEPHI (Microbes Evolution Phylogenie Et Infections), IHU (University Hospital Institute)-Méditerranée Infection, Marseille, France
| | - N Dione
- Aix Marseille Univ, IRD (Development Research Institute), AP-HM (Public Assistance of Marseille Hospitals), MEPHI (Microbes Evolution Phylogenie Et Infections), IHU (University Hospital Institute)-Méditerranée Infection, Marseille, France
| | - I I Ngom
- Aix Marseille Univ, IRD (Development Research Institute), AP-HM (Public Assistance of Marseille Hospitals), MEPHI (Microbes Evolution Phylogenie Et Infections), IHU (University Hospital Institute)-Méditerranée Infection, Marseille, France
| | - M L Tall
- Aix Marseille Univ, IRD (Development Research Institute), AP-HM (Public Assistance of Marseille Hospitals), MEPHI (Microbes Evolution Phylogenie Et Infections), IHU (University Hospital Institute)-Méditerranée Infection, Marseille, France
| | - J P Baudoin
- Aix Marseille Univ, IRD (Development Research Institute), AP-HM (Public Assistance of Marseille Hospitals), MEPHI (Microbes Evolution Phylogenie Et Infections), IHU (University Hospital Institute)-Méditerranée Infection, Marseille, France
| | - D Raoult
- Aix Marseille Univ, IRD (Development Research Institute), AP-HM (Public Assistance of Marseille Hospitals), MEPHI (Microbes Evolution Phylogenie Et Infections), IHU (University Hospital Institute)-Méditerranée Infection, Marseille, France.,Special Infectious Agents Unit, King Fahd Medical Research Centre, King Abdulaziz University, Jeddah, Saudi Arabia
| | - J Y Bou Khalil
- Aix Marseille Univ, IRD (Development Research Institute), AP-HM (Public Assistance of Marseille Hospitals), MEPHI (Microbes Evolution Phylogenie Et Infections), IHU (University Hospital Institute)-Méditerranée Infection, Marseille, France
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24
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Brahim Belhaouari D, Baudoin JP, Gnankou F, Di Pinto F, Colson P, Aherfi S, La Scola B. Evidence of a Cellulosic Layer in Pandoravirus massiliensis Tegument and the Mystery of the Genetic Support of Its Biosynthesis. Front Microbiol 2019; 10:2932. [PMID: 31921087 PMCID: PMC6932959 DOI: 10.3389/fmicb.2019.02932] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2019] [Accepted: 12/05/2019] [Indexed: 11/13/2022] Open
Abstract
Pandoraviruses are giant viruses of ameba with 1 μm-long virions. They have an ovoid morphology and are surrounded by a tegument-like structure lacking any capsid protein nor any gene encoding a capsid protein. In this work, we studied the ultrastructure of the tegument surrounding Pandoravirus massiliensis virions and noticed that this tegument is composed of a peripheral sugar layer, an electron-dense membrane, and a thick electron-dense layer consisting in several tubules arranged in a helicoidal structure resembling that of cellulose. Pandoravirus massiliensis particles were stained by Calcofluor white, a fluorescent dye of cellulose, and the enzymatic treatment of particles by cellulase showed the degradation of the viral tegument. We first hypothesized that the cellulose tegument could be synthesized by enzymes encoded by the virus. Bioinformatic analyses revealed in P. massiliensis, a candidate gene encoding a putative cellulose synthase, with a homology with the BcsA domain, one of the catalytic subunits of the bacterial cellulose synthase, but with a low level of homology. This gene was transcribed during the replicative cycle of P. massiliensis, but several arguments run counter to this hypothesis. Indeed, even if this gene is present in other pandoraviruses, the one of the strain studied is the only one to have this BcsA domain and no other enzymes involved in the synthesis of cellulose could be detected, although we cannot rule out that such genes could have been undetected among the large proportion of Orfans of pandoraviruses. As an alternative, we investigated whether P. massiliensis could divert the cellulose synthesis machinery of the ameba to its own account. Indeed, contrary to what is observed in the case of infections with other giant viruses such as mimiviruses, it appears that the transcription of the ameba, at least for the cellulose synthase gene, continues throughout the growth phase of particles of P. massiliensis. Finally, we believe that this scenario is more plausible. If confirmed, it could be a unique mechanism in the virosphere.
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Affiliation(s)
- Djamal Brahim Belhaouari
- Microbes, Evolution, Phylogeny and Infection (MEPHI), UM63, Institut de Recherche pour le Développement (IRD), Assistance Publique - Hôpitaux de Marseille (AP-HM), Aix-Marseille University, Marseille, France
| | - Jean-Pierre Baudoin
- Microbes, Evolution, Phylogeny and Infection (MEPHI), UM63, Institut de Recherche pour le Développement (IRD), Assistance Publique - Hôpitaux de Marseille (AP-HM), Aix-Marseille University, Marseille, France
| | - Franck Gnankou
- Microbes, Evolution, Phylogeny and Infection (MEPHI), UM63, Institut de Recherche pour le Développement (IRD), Assistance Publique - Hôpitaux de Marseille (AP-HM), Aix-Marseille University, Marseille, France
| | - Fabrizio Di Pinto
- Microbes, Evolution, Phylogeny and Infection (MEPHI), UM63, Institut de Recherche pour le Développement (IRD), Assistance Publique - Hôpitaux de Marseille (AP-HM), Aix-Marseille University, Marseille, France
| | - Philippe Colson
- Microbes, Evolution, Phylogeny and Infection (MEPHI), UM63, Institut de Recherche pour le Développement (IRD), Assistance Publique - Hôpitaux de Marseille (AP-HM), Aix-Marseille University, Marseille, France.,IHU Méditerranée Infection, Marseille, France
| | - Sarah Aherfi
- Microbes, Evolution, Phylogeny and Infection (MEPHI), UM63, Institut de Recherche pour le Développement (IRD), Assistance Publique - Hôpitaux de Marseille (AP-HM), Aix-Marseille University, Marseille, France.,IHU Méditerranée Infection, Marseille, France
| | - Bernard La Scola
- Microbes, Evolution, Phylogeny and Infection (MEPHI), UM63, Institut de Recherche pour le Développement (IRD), Assistance Publique - Hôpitaux de Marseille (AP-HM), Aix-Marseille University, Marseille, France.,IHU Méditerranée Infection, Marseille, France
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25
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Abstract
Bacteria induce platelet aggregation triggered by several mechanisms. The goal of this work was to characterize platelet aggregates induced by different bacterial strains and to quantify the effect of aspirin treatment using aggregation tests, as well as a novel approach based on confocal analysis. Blood samples were obtained from either healthy donors (n = 27) or patients treated with long-term aspirin (n = 15). The bacterial species included were Staphylococcus aureus, Enterococcus faecalis, and Streptococcus sanguinis. The different aggregate's ultrastructures depending on the bacterial strain were analyzed using Scanning electron microscopy. Quantification of the size of the platelet aggregates, their mean number as well as the bacterial impregnation within the aggregates was performed using confocal laser scanning light microscopy. Light Transmission Aggregometry was also performed. Our results reported distinct characteristics of platelet aggregates depending on the bacterial strain. Using confocal analysis, we have shown that aspirin significantly reduced platelet aggregation induced by S. aureus (p = .003) and E. faecalis (p = .006) with no effect in the case of S. sanguinis (p = .529). The results of the aggregometry were concordant with those of the confocal technique in the case of S. aureus and S. sanguinis. Interestingly, aggregation induced by E. faecalis was detected only with confocal analysis. In conclusion, our confocal scanning microscopy allowed a detailed study of the platelet aggregation induced by bacteria. We showed that aspirin acts on bacterial-induced platelet aggregation depending on the species. These results are in favor of the use of aspirin considering the species and the bacterial strain involved.
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Affiliation(s)
- Nadji Hannachi
- Département d'infectiologie, MEPHI, IHU Méditerranée infection, Aix Marseille Univ, IRD, AP-HM , Marseille, France
| | - Jean-Pierre Baudoin
- Département d'infectiologie, MEPHI, IHU Méditerranée infection, Aix Marseille Univ, IRD, AP-HM , Marseille, France
| | - Arsha Prasanth
- Département d'infectiologie, MEPHI, IHU Méditerranée infection, Aix Marseille Univ, IRD, AP-HM , Marseille, France
| | - Gilbert Habib
- Département d'infectiologie, MEPHI, IHU Méditerranée infection, Aix Marseille Univ, IRD, AP-HM , Marseille, France.,Département de cardiologie, la Timone Hospital, AP-HM , Marseille, France
| | - Laurence Camoin-Jau
- Département d'infectiologie, MEPHI, IHU Méditerranée infection, Aix Marseille Univ, IRD, AP-HM , Marseille, France.,Laboratoire d'Hématologie, La Timone Hospital, APHM , Marseille, France
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26
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Yimagou EK, Tall ML, Baudoin JP, Raoult D, Bou Khalil JY. Clostridium transplantifaecale sp. nov., a new bacterium isolated from patient with recurrent Clostridium difficile infection. New Microbes New Infect 2019; 32:100598. [PMID: 31719994 PMCID: PMC6838804 DOI: 10.1016/j.nmni.2019.100598] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Accepted: 08/30/2019] [Indexed: 12/22/2022] Open
Abstract
Clostridium transplantifaecale strain Marseille-P8228T (= CSURP8228) is a new species isolated from a patient with recurrent Clostridium difficile infection.
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Affiliation(s)
- E K Yimagou
- Aix Marseille Univ, IRD, AP-HM, MEPHI, IHU-Méditerranée Infection, Marseille, France
| | - M L Tall
- Aix Marseille Univ, IRD, AP-HM, MEPHI, IHU-Méditerranée Infection, Marseille, France
| | - J P Baudoin
- Aix Marseille Univ, IRD, AP-HM, MEPHI, IHU-Méditerranée Infection, Marseille, France
| | - D Raoult
- Aix Marseille Univ, IRD, AP-HM, MEPHI, IHU-Méditerranée Infection, Marseille, France.,Special Infectious Agents Unit, King Fahd Medical Research Centre, King Abdulaziz University, Jeddah, Saudi Arabia
| | - J Y Bou Khalil
- Aix Marseille Univ, IRD, AP-HM, MEPHI, IHU-Méditerranée Infection, Marseille, France
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27
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N'Gaza ALF, Kouassi KI, Koffi KK, Kouakou KL, Baudoin JP, Zoro BIA. Prevalence and variation of viviparous germination with respect to fruit maturation in the bottle gourd Lagenaria siceraria (Molina) Standley (Cucurbitaceae). Heliyon 2019; 5:e02584. [PMID: 31720446 PMCID: PMC6838920 DOI: 10.1016/j.heliyon.2019.e02584] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2019] [Revised: 07/24/2019] [Accepted: 10/01/2019] [Indexed: 12/19/2022] Open
Abstract
Researches documenting comprehensively the prevalence of seed vivipary in relation to phenology, as well as its impact on production are scant. This article reports the results of investigations carried out during four cropping seasons to quantitatively document seed vivipary in the oleaginous bottle gourd (Lagenaria siceraria). Field experiments were conducted during the first and second cropping season of 2014 and 2015 at the experimental station of Nangui Abrogoua University (Abidjan, Côte d’Ivoire). The assessment of the prevalence of seed vivipary was carried out using 185 L. siceraria accessions collected in different ecological zones of Côte d'Ivoire. To examine the influence of fruit maturation time on seed vivipary, four accessions (two viviparous and two non-viviparous) were cropped and harvested at 30 and 50 days after fertilization (DAF), complete whiteness of plants (CPW) and after 60 days of storage of fruits harvested on plants completely withered (CPWS). Finally, a comparative analysis of seed yield and its main components was conducted using four accessions including two highly viviparous and two non-viviparous. The results on seed vivipary prevalence showed that the oleaginous form of L. siceraria is highly susceptible and allowed the classification of the 185 accessions analyzed into three groups: non-viviparous (2.16%), viviparous (89.19%) and highly viviparous accessions (8.65%). No precocious seed germination was observed in non-viviparous accessions during fruit maturation stage. The fruits of highly viviparous accessions harvested at 30 DAF showed no precocious seed germination while 3.35–17.89% of fruits bearing viviparous seed were observed at 50 DAF. Plants from highly viviparous fruits showed significantly low yields compared those from non-viviparous fruits. These results suggested that an efficient control of seed vivipary allowing a quantitative and qualitative improvement of yield in the oilseed bottle gourd can be ensured by the selection of vivipary-tolerant genotypes and appropriate planning of the harvest time.
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Affiliation(s)
- Aya L F N'Gaza
- Unité de Phytotechnie et Amélioration Génétique, Université Nangui Abrogoua, UFR des Sciences de la Nature, 02 BP 801, Abidjan 02, Cote d'Ivoire
| | - Kouadio I Kouassi
- Unité de Phytotechnie et Amélioration Génétique, Université Nangui Abrogoua, UFR des Sciences de la Nature, 02 BP 801, Abidjan 02, Cote d'Ivoire
| | - Kouamé K Koffi
- Unité de Phytotechnie et Amélioration Génétique, Université Nangui Abrogoua, UFR des Sciences de la Nature, 02 BP 801, Abidjan 02, Cote d'Ivoire
| | - Kouakou L Kouakou
- Unité de Phytotechnie et Amélioration Génétique, Université Nangui Abrogoua, UFR des Sciences de la Nature, 02 BP 801, Abidjan 02, Cote d'Ivoire
| | - Jean-Pierre Baudoin
- Unité de Phytotechnie Tropicale et Horticulture, Gembloux Agro-Bio Tech (GxABT), Université de Liège, passage des Déportés 2, B-5030, Gembloux, Belgium
| | - Bi Irié A Zoro
- Unité de Phytotechnie et Amélioration Génétique, Université Nangui Abrogoua, UFR des Sciences de la Nature, 02 BP 801, Abidjan 02, Cote d'Ivoire
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28
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Kuete Yimagou E, Mekhalif F, Lamine Tall M, Baudoin JP, Raoult D, Bou Khalil JY. Prevotella marseillensis sp. nov., a new bacterium isolated from a patient with recurrent Clostridium difficile infection. New Microbes New Infect 2019; 32:100606. [PMID: 31749965 PMCID: PMC6849444 DOI: 10.1016/j.nmni.2019.100606] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Revised: 09/02/2019] [Accepted: 09/29/2019] [Indexed: 12/22/2022] Open
Abstract
Prevotella marseillensis strain Marseille-P8229T (= CSURP8229) is a new species isolated from a patient with recurrent Clostridium difficile infection. It is an anaerobic, non-motile, non-spore-forming Gram-negative coccobacillus isolated from the stool of patient with recurrent Clostridium difficile infection in Marseille. We present herein its phenotypic description together with MALDI-TOF mass spectrometry analysis and genome sequencing and comparison. The genome of P. marseillensis is 4.1607 Mbp long with 45.80 mol% of G+C content, and it contains 3078 protein-coding genes.
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Affiliation(s)
- E Kuete Yimagou
- Aix Marseille Université, IRD, AP-HM, MEPHI, IHU-Méditerranée Infection, Marseille, France
| | - F Mekhalif
- Aix Marseille Université, IRD, AP-HM, MEPHI, IHU-Méditerranée Infection, Marseille, France
| | - M Lamine Tall
- Aix Marseille Université, IRD, AP-HM, MEPHI, IHU-Méditerranée Infection, Marseille, France
| | - J P Baudoin
- Aix Marseille Université, IRD, AP-HM, MEPHI, IHU-Méditerranée Infection, Marseille, France
| | - D Raoult
- Aix Marseille Université, IRD, AP-HM, MEPHI, IHU-Méditerranée Infection, Marseille, France.,Special Infectious Agents Unit, King Fahd Medical Research Centre, King Abdulaziz University, Jeddah, Saudi Arabia
| | - J Y Bou Khalil
- Aix Marseille Université, IRD, AP-HM, MEPHI, IHU-Méditerranée Infection, Marseille, France
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29
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Rebaa F, Abid G, Aouida M, Abdelkarim S, Aroua I, Muhovski Y, Baudoin JP, M’hamdi M, Sassi K, Jebara M. Genetic variability in Tunisian populations of faba bean ( Vicia faba L. var. major) assessed by morphological and SSR markers. Physiol Mol Biol Plants 2017; 23:397-409. [PMID: 28461727 PMCID: PMC5391353 DOI: 10.1007/s12298-017-0419-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2016] [Revised: 01/09/2017] [Accepted: 01/17/2017] [Indexed: 06/07/2023]
Abstract
The genetic diversity of 21 faba bean populations was examined using morphological and molecular markers. DNA was extracted from 189 individuals and 8 microsatellite markers were genotyped individually in these 21 populations. A total of 53 alleles were obtained in all populations, with an average of 6.62 alleles per locus. The expected and observed heterozygosity was 0.38 and 0.62 respectively. The average polymorphism index content of SSR markers was 0.61, ranging from 0.31 to 0.81. The unweighted pair group method with arithmetic mean dendrogram clustered all the populations into two groups, each for them subdivided into 3 sub-groups according to geographical origin. Morphological variation showed that the populations were not grouped according to their geographical origin. Therefore, patterns of differentiation of morphological traits did not coincide with molecular differentiation, indicating that morphological variation does not reflect genetic subdivision in studied faba bean populations. Analysis of molecular variance revealed high levels of genetic variation (83%) within population and provides a good base for designing genetic improvement programs. The result of Principal Component Analysis (PCA) revealed that three dimensional principal components (PC1, PC2 and PC3) contributed 40.56% of the total variability and accounted with values of 20.64, 11.22 and 8.70%, respectively. Cluster analysis based on PCA indicated three separate groups of populations. The genetic relationships found between the 21 populations samples were the same in both the PCA and STRUCTURE analysis which support the results observed. These data may serve as a foundation for the development of faba bean breeding programs.
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Affiliation(s)
- Feten Rebaa
- Laboratory of Legumes, Center of Biotechnology of Borj Cedria, University of Tunis El Manar, 901, 2050 Hammam-Lif, Tunisia
| | - Ghassen Abid
- Laboratory of Legumes, Center of Biotechnology of Borj Cedria, University of Tunis El Manar, 901, 2050 Hammam-Lif, Tunisia
| | - Marwa Aouida
- Laboratory of Legumes, Center of Biotechnology of Borj Cedria, University of Tunis El Manar, 901, 2050 Hammam-Lif, Tunisia
| | - Souhir Abdelkarim
- Laboratory of Legumes, Center of Biotechnology of Borj Cedria, University of Tunis El Manar, 901, 2050 Hammam-Lif, Tunisia
| | - Ibtissem Aroua
- Laboratory of Legumes, Center of Biotechnology of Borj Cedria, University of Tunis El Manar, 901, 2050 Hammam-Lif, Tunisia
| | - Yordan Muhovski
- Department of Life Sciences, Unit of Biological Engineering, Walloon Agricultural Research Centre, Chaussée de Charleroi, 234, 5030 Gembloux, Belgium
| | - Jean-Pierre Baudoin
- Laboratory of Tropical Agroecology, Gembloux Agro-Bio Tech, University of Liège, Passage des Déportés 2, 5030 Gembloux, Belgium
| | - Mahmoud M’hamdi
- Laboratory of Vegetable Crops, Higher Agronomic Institute of Chott Mariem (ISA-CM), 47, 4042 Chott-Mariem, Tunisia
| | - Khaled Sassi
- Department of Agronomy and Plant Biotechnology, National Agronomy Institute of Tunisia (INAT), University of Carthage, Avenue Charles Nicolle, 43, 1082 Tunis-Mahrajène, Tunisia
| | - Moez Jebara
- Laboratory of Legumes, Center of Biotechnology of Borj Cedria, University of Tunis El Manar, 901, 2050 Hammam-Lif, Tunisia
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30
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Bou Khalil JY, Benamar S, Baudoin JP, Croce O, Blanc-Tailleur C, Pagnier I, Raoult D, La Scola B. Developmental Cycle and Genome Analysis of "Rubidus massiliensis," a New Vermamoeba vermiformis Pathogen. Front Cell Infect Microbiol 2016; 6:31. [PMID: 27014641 PMCID: PMC4791399 DOI: 10.3389/fcimb.2016.00031] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2015] [Accepted: 03/01/2016] [Indexed: 12/15/2022] Open
Abstract
The study of amoeba-associated Chlamydiae is a dynamic field in which new species are increasingly reported. In the present work, we characterized the developmental cycle and analyzed the genome of a new member of this group associated with Vermamoeba vermiformis, we propose to name “Rubidus massiliensis.” This bacterium is well-adapted to its amoeba host and do not reside inside of inclusion vacuoles after phagocytosis. It has a developmental cycle typical of this family of bacteria, with a transition from condensed elementary bodies to hypodense replicative reticulate bodies. Multiplication occurs through binary fission of the reticulate bodies. The genome of “R. massiliensis” consists of a 2.8 Mbp chromosome and two plasmids (pRm1, pRm2) consisting of 39,075 bp and 80,897 bp, respectively, a feature that is unique within this group. The Re-analysis of the Chlamydiales genomes including the one of “R. massiliensis” slightly modified the previous phylogeny of the tlc gene encoding the ADP/ATP translocase. Our analysis suggested that the tlc gene could have been transferred to plant and algal plastids before the transfer to Rickettsiales, and that this gene was probably duplicated several times.
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Affiliation(s)
- Jacques Y Bou Khalil
- Unité de Recherche sur les Maladies Infectieuses et Tropicales Emergentes, Facultés de Médecine et de Pharmacie, UM63 Centre National de la Recherche Scientifique 7278 IRD 198 Institut National de la Santé et de la Recherche Médicale U1095, Aix-Marseille Université Marseille, France
| | - Samia Benamar
- Unité de Recherche sur les Maladies Infectieuses et Tropicales Emergentes, Facultés de Médecine et de Pharmacie, UM63 Centre National de la Recherche Scientifique 7278 IRD 198 Institut National de la Santé et de la Recherche Médicale U1095, Aix-Marseille Université Marseille, France
| | - Jean-Pierre Baudoin
- Pôle des Maladies Infectieuses et Tropicales Clinique et Biologique, Fédération de Bactériologie-Hygiène-Virologie, Centre Hospitalo-Universitaire Timone, Institut Hospitalo-Universitaire Méditerranée Infection, Assistance Publique - Hôpitaux de Marseille Marseille, France
| | - Olivier Croce
- Unité de Recherche sur les Maladies Infectieuses et Tropicales Emergentes, Facultés de Médecine et de Pharmacie, UM63 Centre National de la Recherche Scientifique 7278 IRD 198 Institut National de la Santé et de la Recherche Médicale U1095, Aix-Marseille Université Marseille, France
| | - Caroline Blanc-Tailleur
- Unité de Recherche sur les Maladies Infectieuses et Tropicales Emergentes, Facultés de Médecine et de Pharmacie, UM63 Centre National de la Recherche Scientifique 7278 IRD 198 Institut National de la Santé et de la Recherche Médicale U1095, Aix-Marseille Université Marseille, France
| | - Isabelle Pagnier
- Unité de Recherche sur les Maladies Infectieuses et Tropicales Emergentes, Facultés de Médecine et de Pharmacie, UM63 Centre National de la Recherche Scientifique 7278 IRD 198 Institut National de la Santé et de la Recherche Médicale U1095, Aix-Marseille Université Marseille, France
| | - Didier Raoult
- Unité de Recherche sur les Maladies Infectieuses et Tropicales Emergentes, Facultés de Médecine et de Pharmacie, UM63 Centre National de la Recherche Scientifique 7278 IRD 198 Institut National de la Santé et de la Recherche Médicale U1095, Aix-Marseille UniversitéMarseille, France; Pôle des Maladies Infectieuses et Tropicales Clinique et Biologique, Fédération de Bactériologie-Hygiène-Virologie, Centre Hospitalo-Universitaire Timone, Institut Hospitalo-Universitaire Méditerranée Infection, Assistance Publique - Hôpitaux de MarseilleMarseille, France
| | - Bernard La Scola
- Unité de Recherche sur les Maladies Infectieuses et Tropicales Emergentes, Facultés de Médecine et de Pharmacie, UM63 Centre National de la Recherche Scientifique 7278 IRD 198 Institut National de la Santé et de la Recherche Médicale U1095, Aix-Marseille UniversitéMarseille, France; Pôle des Maladies Infectieuses et Tropicales Clinique et Biologique, Fédération de Bactériologie-Hygiène-Virologie, Centre Hospitalo-Universitaire Timone, Institut Hospitalo-Universitaire Méditerranée Infection, Assistance Publique - Hôpitaux de MarseilleMarseille, France
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Temmam S, Monteil-Bouchard S, Robert C, Baudoin JP, Sambou M, Aubadie-Ladrix M, Labas N, Raoult D, Mediannikov O, Desnues C. Characterization of Viral Communities of Biting Midges and Identification of Novel Thogotovirus Species and Rhabdovirus Genus. Viruses 2016; 8:77. [PMID: 26978389 PMCID: PMC4810267 DOI: 10.3390/v8030077] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2015] [Revised: 01/22/2016] [Accepted: 03/01/2016] [Indexed: 12/17/2022] Open
Abstract
More than two thirds of emerging viruses are of zoonotic origin, and among them RNA viruses represent the majority. Ceratopogonidae (genus Culicoides) are well-known vectors of several viruses responsible for epizooties (bluetongue, epizootic haemorrhagic disease, etc.). They are also vectors of the only known virus infecting humans: the Oropouche virus. Female midges usually feed on a variety of hosts, leading to possible transmission of emerging viruses from animals to humans. In this context, we report here the analysis of RNA viral communities of Senegalese biting midges using next-generation sequencing techniques as a preliminary step toward the identification of potential viral biohazards. Sequencing of the RNA virome of three pools of Culicoides revealed the presence of a significant diversity of viruses infecting plants, insects and mammals. Several novel viruses were detected, including a novel Thogotovirus species, related but genetically distant from previously described tick-borne thogotoviruses. Novel rhabdoviruses were also detected, possibly constituting a novel Rhabdoviridae genus, and putatively restricted to insects. Sequences related to the major viruses transmitted by Culicoides, i.e., African horse sickness, bluetongue and epizootic haemorrhagic disease viruses were also detected. This study highlights the interest in monitoring the emergence and circulation of zoonoses and epizooties using their arthropod vectors.
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Affiliation(s)
- Sarah Temmam
- Unité de Recherche sur les Maladies Infectieuses et Tropicales Emergentes (URMITE), UM63 CNRS 7278 IRD 198 INSERM U1095, Aix-Marseille Université, Marseille 13005, France.
| | - Sonia Monteil-Bouchard
- Unité de Recherche sur les Maladies Infectieuses et Tropicales Emergentes (URMITE), UM63 CNRS 7278 IRD 198 INSERM U1095, Aix-Marseille Université, Marseille 13005, France.
| | - Catherine Robert
- Unité de Recherche sur les Maladies Infectieuses et Tropicales Emergentes (URMITE), UM63 CNRS 7278 IRD 198 INSERM U1095, Aix-Marseille Université, Marseille 13005, France.
| | - Jean-Pierre Baudoin
- Unité de Recherche sur les Maladies Infectieuses et Tropicales Emergentes (URMITE), UM63 CNRS 7278 IRD 198 INSERM U1095, Aix-Marseille Université, Marseille 13005, France.
| | - Masse Sambou
- Unité de Recherche sur les Maladies Infectieuses et Tropicales Emergentes (URMITE), UM63 CNRS 7278 IRD 198 INSERM U1095, Aix-Marseille Université, Marseille 13005, France.
| | - Maxence Aubadie-Ladrix
- Unité de Recherche sur les Maladies Infectieuses et Tropicales Emergentes (URMITE), UM63 CNRS 7278 IRD 198 INSERM U1095, Aix-Marseille Université, Marseille 13005, France.
| | - Noémie Labas
- Unité de Recherche sur les Maladies Infectieuses et Tropicales Emergentes (URMITE), UM63 CNRS 7278 IRD 198 INSERM U1095, Aix-Marseille Université, Marseille 13005, France.
| | - Didier Raoult
- Unité de Recherche sur les Maladies Infectieuses et Tropicales Emergentes (URMITE), UM63 CNRS 7278 IRD 198 INSERM U1095, Aix-Marseille Université, Marseille 13005, France.
- Fondation IHU Méditerranée Infection, Pôle des Maladies Infectieuses et Tropicales Clinique et Biologique, Fédération de Bactériologie-Hygiène-Virologie, Centre Hospitalo-Universitaire Timone, Méditerranée Infection, Assistance Publique-Hôpitaux de Marseille, Marseille 13005, France.
| | - Oleg Mediannikov
- Unité de Recherche sur les Maladies Infectieuses et Tropicales Emergentes (URMITE), UM63 CNRS 7278 IRD 198 INSERM U1095, Aix-Marseille Université, Marseille 13005, France.
| | - Christelle Desnues
- Unité de Recherche sur les Maladies Infectieuses et Tropicales Emergentes (URMITE), UM63 CNRS 7278 IRD 198 INSERM U1095, Aix-Marseille Université, Marseille 13005, France.
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Liv N, van Oosten Slingeland DSB, Baudoin JP, Kruit P, Piston DW, Hoogenboom JP. Electron Microscopy of Living Cells During in Situ Fluorescence Microscopy. ACS Nano 2016; 10:265-73. [PMID: 26580231 PMCID: PMC4729641 DOI: 10.1021/acsnano.5b03970] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
We present an approach toward dynamic nanoimaging: live fluorescence of cells encapsulated in a bionanoreactor is complemented with in situ scanning electron microscopy (SEM) on an integrated microscope. This allows us to take SEM snapshots on-demand, that is, at a specific location in time, at a desired region of interest, guided by the dynamic fluorescence imaging. We show that this approach enables direct visualization, with EM resolution, of the distribution of bioconjugated quantum dots on cellular extensions during uptake and internalization.
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Affiliation(s)
- Nalan Liv
- Department of Imaging Physics, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands
| | | | - Jean-Pierre Baudoin
- Department of Molecular Physiology and Biophysics, Vanderbilt University, 747 Light Hall, Nashville, Tennessee 37232-0615, United States
| | - Pieter Kruit
- Department of Imaging Physics, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands
| | - David W. Piston
- Department of Molecular Physiology and Biophysics, Vanderbilt University, 747 Light Hall, Nashville, Tennessee 37232-0615, United States
| | - Jacob P. Hoogenboom
- Department of Imaging Physics, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands
- Corresponding Author:
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Temmam S, Monteil-Bouchard S, Sambou M, Aubadie-Ladrix M, Azza S, Decloquement P, Khalil JYB, Baudoin JP, Jardot P, Robert C, La Scola B, Mediannikov OY, Raoult D, Desnues C. Faustovirus-Like Asfarvirus in Hematophagous Biting Midges and Their Vertebrate Hosts. Front Microbiol 2015; 6:1406. [PMID: 26733117 PMCID: PMC4679923 DOI: 10.3389/fmicb.2015.01406] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2015] [Accepted: 11/25/2015] [Indexed: 11/29/2022] Open
Abstract
Faustovirus, a new Asfarviridae-related giant virus, was recently isolated in Vermamoeba vermiformis, a protist found in sewage water in various geographical locations and occasionally reported in human eye infection cases. As part of a global metagenomic analysis of viral communities existing in biting midges, we report here for the first time the identification and isolation of a Faustovirus-like virus in hematophagous arthropods and its detection in their animal hosts. The DNA virome analysis of three pools of Culicoides sp., engorged female Culicoides imicola and non-engorged male/female C. imicola biting midges collected in Senegal, revealed the presence of amoeba-infecting giant viruses and, among them, a majority of sequences related to Faustovirus. Phylogenetic analyses conducted on several structural genes of Faustovirus confirmed the clustering of the arthropod-borne Faustovirus with sewage-borne Faustoviruses, with a distinct geographical clustering of Senegalese Faustovirus strains. Transmission electron microscopy identified viral particles with morphologies and diameters which were compatible with Faustovirus. The presence of infectious arthropod-borne Faustovirus was finally confirmed by successful isolation on V. vermiformis amoeba. Global proteomic analysis of biting midges identified that arthropods' blood meal originating from cattle, rodents and humans. Further screening of cattle sera and rodent tissue resulted in prevalence of Faustovirus being estimated at 38% in rodents and 14% in cattle, suggesting a possible origin of Faustovirus presence in arthropods via the ingestion of contaminated blood meal. Viral loads were the highest in rodents' urine and kidney samples, suggesting a possible excretion of viral particles into the environment. Faustovirus DNA polymerase-related sequences were also detected in more than 9 and 11% of febrile patients and healthy Senegalese human sera, respectively. Our study thus, highlights the need to investigate the role of arthropods, wildlife, and domestic animals in the lifecycle of amoeba-infecting giant viruses and, in particular, the environmental cycle of Faustovirus.
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Affiliation(s)
- Sarah Temmam
- Unité de Recherche sur les Maladies Infectieuses et Tropicales Emergentes, UM63 Centre National de la Recherche Scientifique 7278 IRD 198 Institut National de la Santé et de la Recherche Médicale U1095, Aix-Marseille Université Marseille, France
| | - Sonia Monteil-Bouchard
- Unité de Recherche sur les Maladies Infectieuses et Tropicales Emergentes, UM63 Centre National de la Recherche Scientifique 7278 IRD 198 Institut National de la Santé et de la Recherche Médicale U1095, Aix-Marseille Université Marseille, France
| | - Masse Sambou
- Unité de Recherche sur les Maladies Infectieuses et Tropicales Emergentes, UM63 Centre National de la Recherche Scientifique 7278 IRD 198 Institut National de la Santé et de la Recherche Médicale U1095, Aix-Marseille Université Dakar, Senegal
| | - Maxence Aubadie-Ladrix
- Unité de Recherche sur les Maladies Infectieuses et Tropicales Emergentes, UM63 Centre National de la Recherche Scientifique 7278 IRD 198 Institut National de la Santé et de la Recherche Médicale U1095, Aix-Marseille Université Dakar, Senegal
| | - Saïd Azza
- Unité de Recherche sur les Maladies Infectieuses et Tropicales Emergentes, UM63 Centre National de la Recherche Scientifique 7278 IRD 198 Institut National de la Santé et de la Recherche Médicale U1095, Aix-Marseille Université Marseille, France
| | - Philippe Decloquement
- Unité de Recherche sur les Maladies Infectieuses et Tropicales Emergentes, UM63 Centre National de la Recherche Scientifique 7278 IRD 198 Institut National de la Santé et de la Recherche Médicale U1095, Aix-Marseille Université Marseille, France
| | - Jacques Y Bou Khalil
- Unité de Recherche sur les Maladies Infectieuses et Tropicales Emergentes, UM63 Centre National de la Recherche Scientifique 7278 IRD 198 Institut National de la Santé et de la Recherche Médicale U1095, Aix-Marseille Université Marseille, France
| | - Jean-Pierre Baudoin
- Unité de Recherche sur les Maladies Infectieuses et Tropicales Emergentes, UM63 Centre National de la Recherche Scientifique 7278 IRD 198 Institut National de la Santé et de la Recherche Médicale U1095, Aix-Marseille Université Marseille, France
| | - Priscilla Jardot
- Unité de Recherche sur les Maladies Infectieuses et Tropicales Emergentes, UM63 Centre National de la Recherche Scientifique 7278 IRD 198 Institut National de la Santé et de la Recherche Médicale U1095, Aix-Marseille Université Marseille, France
| | - Catherine Robert
- Unité de Recherche sur les Maladies Infectieuses et Tropicales Emergentes, UM63 Centre National de la Recherche Scientifique 7278 IRD 198 Institut National de la Santé et de la Recherche Médicale U1095, Aix-Marseille Université Marseille, France
| | - Bernard La Scola
- Unité de Recherche sur les Maladies Infectieuses et Tropicales Emergentes, UM63 Centre National de la Recherche Scientifique 7278 IRD 198 Institut National de la Santé et de la Recherche Médicale U1095, Aix-Marseille UniversitéMarseille, France; Fondation IHU Méditerranée Infection, Pôle des Maladies Infectieuses et Tropicales Clinique et Biologique, Fédération de Bactériologie-Hygiène-Virologie, Centre Hospitalo-Universitaire Timone, Méditerranée Infection, Assistance Publique - Hôpitaux de MarseilleMarseille, France
| | - Oleg Y Mediannikov
- Unité de Recherche sur les Maladies Infectieuses et Tropicales Emergentes, UM63 Centre National de la Recherche Scientifique 7278 IRD 198 Institut National de la Santé et de la Recherche Médicale U1095, Aix-Marseille Université Marseille, France
| | - Didier Raoult
- Unité de Recherche sur les Maladies Infectieuses et Tropicales Emergentes, UM63 Centre National de la Recherche Scientifique 7278 IRD 198 Institut National de la Santé et de la Recherche Médicale U1095, Aix-Marseille UniversitéMarseille, France; Fondation IHU Méditerranée Infection, Pôle des Maladies Infectieuses et Tropicales Clinique et Biologique, Fédération de Bactériologie-Hygiène-Virologie, Centre Hospitalo-Universitaire Timone, Méditerranée Infection, Assistance Publique - Hôpitaux de MarseilleMarseille, France
| | - Christelle Desnues
- Unité de Recherche sur les Maladies Infectieuses et Tropicales Emergentes, UM63 Centre National de la Recherche Scientifique 7278 IRD 198 Institut National de la Santé et de la Recherche Médicale U1095, Aix-Marseille Université Marseille, France
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Koffi KK, Vroh BI, Baudoin JP, Zoro BIA. Genetic relationships among accessions of African indigenous melons (Cucumis melo L. ssp. agrestis) using AFLP markers. BIOCHEM SYST ECOL 2014. [DOI: 10.1016/j.bse.2014.06.008] [Citation(s) in RCA: 1] [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: 11/15/2022]
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Chabrière E, Gonzalez D, Azza S, Durand P, Shiekh FA, Moal V, Baudoin JP, Pagnier I, Raoult D. Fetuin is the key for nanon self-propagation. Microb Pathog 2014; 73:25-30. [DOI: 10.1016/j.micpath.2014.05.003] [Citation(s) in RCA: 4] [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] [Received: 03/07/2014] [Revised: 05/07/2014] [Accepted: 05/12/2014] [Indexed: 12/20/2022]
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Dahmen T, Baudoin JP, Lupini AR, Kübel C, Slusallek P, de Jonge N. Combined scanning transmission electron microscopy tilt- and focal series. Microsc Microanal 2014; 20:548-560. [PMID: 24548618 DOI: 10.1017/s1431927614000075] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
In this study, a combined tilt- and focal series is proposed as a new recording scheme for high-angle annular dark-field scanning transmission electron microscopy (STEM) tomography. Three-dimensional (3D) data were acquired by mechanically tilting the specimen, and recording a through-focal series at each tilt direction. The sample was a whole-mount macrophage cell with embedded gold nanoparticles. The tilt-focal algebraic reconstruction technique (TF-ART) is introduced as a new algorithm to reconstruct tomograms from such combined tilt- and focal series. The feasibility of TF-ART was demonstrated by 3D reconstruction of the experimental 3D data. The results were compared with a conventional STEM tilt series of a similar sample. The combined tilt- and focal series led to smaller "missing wedge" artifacts, and a higher axial resolution than obtained for the STEM tilt series, thus improving on one of the main issues of tilt series-based electron tomography.
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Affiliation(s)
- Tim Dahmen
- 1 German Research Center for Artificial Intelligence GmbH (DFKI), 66123 Saarbrücken, Germany
| | - Jean-Pierre Baudoin
- 2 Department of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, TN 37232-0615, USA
| | - Andrew R Lupini
- 4 Karlsruhe Institute for Technology (KIT), 76344 Eggenstein-Leopoldshafen, Germany
| | - Christian Kübel
- 4 Karlsruhe Institute for Technology (KIT), 76344 Eggenstein-Leopoldshafen, Germany
| | - Philipp Slusallek
- 1 German Research Center for Artificial Intelligence GmbH (DFKI), 66123 Saarbrücken, Germany
| | - Niels de Jonge
- 2 Department of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, TN 37232-0615, USA
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Baudoin JP, Jinschek JR, Boothroyd CB, Dunin-Borkowski RE, de Jonge N. Chromatic aberration-corrected tilt series transmission electron microscopy of nanoparticles in a whole mount macrophage cell. Microsc Microanal 2013; 19:814-820. [PMID: 23659678 DOI: 10.1017/s1431927613001475] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Transmission electron microscopy (TEM) in combination with electron tomography is widely used to obtain nanometer scale three-dimensional (3D) structural information about biological samples. However, studies of whole eukaryotic cells are limited in resolution and/or contrast on account of the effect of chromatic aberration of the TEM objective lens on electrons that have been scattered inelastically in the specimen. As a result, 3D information is usually obtained from sections and not from whole cells. Here, we use chromatic aberration-corrected TEM to record bright-field TEM images of nanoparticles in a whole mount macrophage cell. Tilt series of images are used to generate electron tomograms, which are analyzed to assess the spatial resolution that can be achieved for different vertical positions in the specimen. The uptake of gold nanoparticles coated with low-density lipoprotein (LDL) is studied. The LDL is found to assemble in clusters. The clusters contain nanoparticles taken up on different days, which are joined without mixing their nanoparticle cargo.
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Affiliation(s)
- Jean-Pierre Baudoin
- Department of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, TN 37232-0615, USA
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Baudoin JP, Jerome WG, Kübel C, de Jonge N. Whole-cell analysis of low-density lipoprotein uptake by macrophages using STEM tomography. PLoS One 2013; 8:e55022. [PMID: 23383042 PMCID: PMC3561407 DOI: 10.1371/journal.pone.0055022] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2012] [Accepted: 12/18/2012] [Indexed: 11/19/2022] Open
Abstract
Nanoparticles of heavy materials such as gold can be used as markers in quantitative electron microscopic studies of protein distributions in cells with nanometer spatial resolution. Studying nanoparticles within the context of cells is also relevant for nanotoxicological research. Here, we report a method to quantify the locations and the number of nanoparticles, and of clusters of nanoparticles inside whole eukaryotic cells in three dimensions using scanning transmission electron microscopy (STEM) tomography. Whole-mount fixed cellular samples were prepared, avoiding sectioning or slicing. The level of membrane staining was kept much lower than is common practice in transmission electron microscopy (TEM), such that the nanoparticles could be detected throughout the entire cellular thickness. Tilt-series were recorded with a limited tilt-range of 80° thereby preventing excessive beam broadening occurring at higher tilt angles. The 3D locations of the nanoparticles were nevertheless determined with high precision using computation. The obtained information differed from that obtained with conventional TEM tomography data since the nanoparticles were highlighted while only faint contrast was obtained on the cellular material. Similar as in fluorescence microscopy, a particular set of labels can be studied. This method was applied to study the fate of sequentially up-taken low-density lipoprotein (LDL) conjugated to gold nanoparticles in macrophages. Analysis of a 3D reconstruction revealed that newly up-taken LDL-gold was delivered to lysosomes containing previously up-taken LDL-gold thereby forming onion-like clusters.
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Affiliation(s)
- Jean-Pierre Baudoin
- Department of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, Tennessee, United States of America
| | - W. Gray Jerome
- Department of Pathology, Microbiology and Immunology, Vanderbilt University School of Medicine, Nashville, Tennessee, United States of America
| | - Christian Kübel
- Institute of Nanotechnology (INT) and Karlsruhe Nano Micro Facility (KNMF), Karlsruhe Institute of Technology (KIT), Eggenstein-Leopoldshaffen, Germany
| | - Niels de Jonge
- Department of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, Tennessee, United States of America
- INM – Leibniz Institute for New Materials, Saarbrücken, Germany
- * E-mail:
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Baudoin JP, Viou L, Launay PS, Luccardini C, Espeso Gil S, Kiyasova V, Irinopoulou T, Alvarez C, Rio JP, Boudier T, Lechaire JP, Kessaris N, Spassky N, Métin C. Tangentially Migrating Neurons Assemble a Primary Cilium that Promotes Their Reorientation to the Cortical Plate. Neuron 2012; 76:1108-22. [DOI: 10.1016/j.neuron.2012.10.027] [Citation(s) in RCA: 84] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/08/2012] [Indexed: 10/27/2022]
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Nacoulima N, Baudoin JP, Mergeai G. Introgression of improved fiber fineness trait in G. hirsutum L. from G. longicalyx Hutch. & Lee. Commun Agric Appl Biol Sci 2012; 77:207-211. [PMID: 22558782] [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] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Affiliation(s)
- N Nacoulima
- Gembloux Agricultural University, Unité de Phytotechnie tropical et Horticulture, 2 passage des déportés, B-5030 Gembloux
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Loukou AL, Lognay G, Barthelemy JP, Maesen P, Baudoin JP, Zoro BIA. Effect of harvest time on seed oil and protein contents and compositions in the oleaginous gourd Lagenaria siceraria (Molina) Standl. J Sci Food Agric 2011; 91:2073-2080. [PMID: 21547916 DOI: 10.1002/jsfa.4422] [Citation(s) in RCA: 3] [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] [Received: 09/20/2010] [Revised: 02/17/2011] [Accepted: 02/28/2011] [Indexed: 05/30/2023]
Abstract
BACKGROUND The stage of fruit ripeness at the time of harvest determines the final quality of ripe fruit. In this study, changes in the chemical composition of seed kernels from the oleaginous gourd Lagenaria siceraria (Molina) Standl. during maturation were evaluated to determine the best time to harvest the berries. Two cultivars (round and oval berry) were studied at three maturation stages (30 and 50 days after fruit set (DAFS) and complete plant whiteness (CPW)). RESULTS Seed kernels were rich in oil (527.2-544.6 g kg(-1)), protein (402.8-403.3 g kg(-1)), minerals and energy. Maturation influenced the chemical compounds of the two cultivars differently. Best quantities of these components were reached at 50 DAFS. However, protein bioavailability was better at 30 DAFS and CPW in the round and oval berry cultivars respectively. Lagenaria siceraria oils were of good quality, containing an abundance of essential fatty acids (647.2-667.0 g kg(-1)). CONCLUSION Both cultivars of L. siceraria should be harvested at 50 DAFS owing to the good nutritional properties of their seeds and oils. However, to obtain best-quality proteins, round and oval berry cultivars should be harvested at 30 DAFS and CPW respectively. The results of this study will be useful in reducing the production time of fruits and improving the nutritional quality of their seeds.
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Affiliation(s)
- Ahou L Loukou
- Unité de Formation et de Recherche des Sciences et Technologies des Aliments, Université d'Abobo-Adjamé, Abidjan, Ivory Coast.
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Abstract
Silicon microchips with thin, electron transparent silicon nitride windows provide a sample support that accommodates both light-, and electron microscopy of whole eukaryotic cells in vacuum or liquid, with minimum sample preparation steps. The windows are robust enough that cellular samples can be cultured directly onto them, with no addition of a supporting film, and there is no need to embed or section the sample, as is typically required in electron microscopy. By combining two microchips, a microfluidic chamber can be constructed for the imaging of samples in liquid in the electron microscope. We provide microchip design specifications, a fabrication outline, instructions on how to prepare the microchips for biological samples, and examples of images obtained using different light and electron microscopy modalities. The use of these microchips is particularly advantageous for correlative light and electron microscopy.
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Affiliation(s)
- E A Ring
- Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, USA
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Abid G, Muhovski Y, Jacquemin JM, Mingeot D, Sassi K, Toussaint A, Baudoin JP. Characterization and expression profile analysis of a sucrose synthase gene from common bean (Phaseolus vulgaris L.) during seed development. Mol Biol Rep 2011; 39:1133-43. [PMID: 21573790 DOI: 10.1007/s11033-011-0842-y] [Citation(s) in RCA: 5] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2010] [Accepted: 05/05/2011] [Indexed: 11/28/2022]
Abstract
A full-length cDNA encoding common bean (Phaseolus vulgaris L.) sucrose synthase (designated as Pv_BAT93 Sus), which catalyses the synthesis and cleavage of sucrose, was isolated from seeds at 15 days after pollination (DAP) by rapid amplification of cDNA ends (RACE). The full-length cDNA of Pv_BAT93 Sus had a 2,418 bp open reading frame (ORF) encoding a protein of 806 amino acid residues. Sequence comparison analysis showed that Pv_BAT93 Sus was very similar to several members of the sucrose synthase family of other plant species. Tissue expression pattern analysis showed that Pv_BAT93 Sus was expressed in leaves, flowers, stems, roots, cotyledons, and particularly during seed development. Expression studies using in situ hybridization revealed altered spatial and temporal patterns of Sus expression in the EMS mutant relative to wild-type and confirmed Sus expression in common bean developing seeds. The expression and accumulation of Sus mRNA was clearly shown in several tissues, such as the suspensor and embryo, but also in the transfer cells and endothelium. The results highlight the diverse roles that Sus might play during seed development in common bean.
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Affiliation(s)
- Ghassen Abid
- University of Liège-Gembloux Agro-Bio Tech., Unit of Tropical Crop Husbandry and Horticulture, Gembloux Agricultural University, Passage des Déportés 2, 5030 Gembloux, Belgium.
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Dukes MJ, Ramachandra R, Baudoin JP, Gray Jerome W, de Jonge N. Three-dimensional locations of gold-labeled proteins in a whole mount eukaryotic cell obtained with 3nm precision using aberration-corrected scanning transmission electron microscopy. J Struct Biol 2011; 174:552-62. [PMID: 21440635 DOI: 10.1016/j.jsb.2011.03.013] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2011] [Revised: 03/17/2011] [Accepted: 03/18/2011] [Indexed: 01/23/2023]
Abstract
Three-dimensional (3D) maps of proteins within the context of whole cells are important for investigating cellular function. However, 3D reconstructions of whole cells are challenging to obtain using conventional transmission electron microscopy (TEM). We describe a methodology to determine the 3D locations of proteins labeled with gold nanoparticles on whole eukaryotic cells. The epidermal growth factor receptors on COS7 cells were labeled with gold nanoparticles, and critical-point dried whole-mount cell samples were prepared. 3D focal series were obtained with aberration-corrected scanning transmission electron microscopy (STEM), without tilting the specimen. The axial resolution was improved with deconvolution. The vertical locations of the nanoparticles in a whole-mount cell were determined with a precision of 3nm. From the analysis of the variation of the axial positions of the labels we concluded that the cellular surface was ruffled. To achieve sufficient stability of the sample under electron beam irradiation during the recording of the focal series, the sample was carbon coated. A quantitative method was developed to analyze the stability of the ultrastructure after electron beam irradiation using TEM. The results of this study demonstrate the feasibility of using aberration-corrected STEM to study the 3D nanoparticle distribution in whole cells.
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Affiliation(s)
- Madeline J Dukes
- Department of Chemistry, Vanderbilt University, Nashville, TN 37235, USA
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Abstract
Fishes and amphibians localize hydromechanical variations along their bodies using the lateral-line sensory system. This is possible because the spatial distribution of neuromasts is represented in the hindbrain by a somatotopic organization of the lateralis afferent neurons' central projections. The mechanisms that establish lateralis somatotopy are not known. Using BAPTI and neuronal tracing in the zebrafish, we demonstrate growth anisotropy of the posterior lateralis ganglion. We characterized a new transgenic line for in vivo imaging to show that although peripheral growth-cone structure adumbrates somatotopy, the order of neurogenesis represents a more accurate predictor of the position of a neuron's central axon along the somatotopic axis in the hindbrain. We conclude that progressive neurogenesis defines lateralis somatotopy.
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Affiliation(s)
- Jesús Pujol-Martí
- Laboratory of Sensory Cell Biology and Organogenesis, Centre de Regulació Genòmica, Barcelona, Spain
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Faucherre A, Baudoin JP, Pujol-Martí J, López-Schier H. Multispectral four-dimensional imaging reveals that evoked activity modulates peripheral arborization and the selection of plane-polarized targets by sensory neurons. Development 2010; 137:1635-43. [DOI: 10.1242/dev.047316] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [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
The polarity of apical stereocilia endows hair cells with directional excitability, which in turn enables animals to determine the vectorial component of a sound. Neuromasts of the lateral line of aquatic vertebrates harbor two populations of hair cells that are oriented at 180° relative to each other. The resulting sensory-vectorial ambiguity is solved by lateralis afferent neurons that discriminate between hair cells of opposite polarities to innervate only those with the same orientation. How neurons select identically oriented hair cells remains unknown. To gain insight into the mechanism that underlies this selection, we devised a simple method to gather dynamic morphometric information about axonal terminals in toto by four-dimensional imaging. Applying this strategy to the zebrafish allowed us to correlate hair cell orientation to single afferent neurons at subcellular resolution. Here we show that in zebrafish with absent hair cell mechanoreception, lateralis afferents arborize profusely in the periphery, display less stability, and make improper target selections. Central axons, however, show no dynamic changes and establish normal contacts with the Mauthner cell, a characteristic second-order target in the hindbrain. We propose that the hardwired developmental mechanisms that underlie peripheral arborization and target recognition are modulated by evoked hair cell activity. This interplay between intrinsic and extrinsic cues is essential for plane-polarized target selection by lateralis afferent neurons.
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Affiliation(s)
- Adèle Faucherre
- Laboratory of Sensory Cell Biology and Organogenesis, Centre de Regulació Genòmica, Doctor Aiguader 88, (08003) Barcelona, Spain
| | - Jean-Pierre Baudoin
- Laboratory of Sensory Cell Biology and Organogenesis, Centre de Regulació Genòmica, Doctor Aiguader 88, (08003) Barcelona, Spain
| | - Jesús Pujol-Martí
- Laboratory of Sensory Cell Biology and Organogenesis, Centre de Regulació Genòmica, Doctor Aiguader 88, (08003) Barcelona, Spain
| | - Hernán López-Schier
- Laboratory of Sensory Cell Biology and Organogenesis, Centre de Regulació Genòmica, Doctor Aiguader 88, (08003) Barcelona, Spain
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Kouonon LC, Jacquemart AL, Zoro Bi AI, Bertin P, Baudoin JP, Dje Y. Reproductive biology of the andromonoecious Cucumis melo subsp. agrestis (Cucurbitaceae). Ann Bot 2009; 104:1129-39. [PMID: 19671577 PMCID: PMC2766191 DOI: 10.1093/aob/mcp196] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2009] [Revised: 06/03/2009] [Accepted: 07/03/2009] [Indexed: 05/07/2023]
Abstract
BACKGROUND AND AIMS Cucumis melo subsp. agrestis (Cucurbitaceae) is cultivated in many African regions for its edible kernels used as a soup thickener. The plant, an annual, andromonoecious, trailing-vine species, is of high social, cultural and economic value for local communities. In order to improve the yield of this crop, the first step and our aim were to elucidate its breeding system. METHODS Eight experimental pollination treatments were performed during three growing seasons to assess spontaneous selfing, self-compatibility and effects of pollen source (hermaphroditic vs. male flowers). Pollination success was determined by pollen tube growth and reproductive success was assessed by fruit, seed and seedling numbers and characteristics. The pollinator guild was surveyed and the pollination distance determined both by direct observations and by indirect fluorescent dye dispersal. KEY RESULTS The species is probably pollinated by several Hymenoptera, principally by Hypotrigona para. Pollinator flight distances varied from 25 to 69 cm. No evidence for apomixis or spontaneous self-pollination in the absence of insect visitors was found. The self-fertility index (SFI = 0) indicated a total dependence on pollinators for reproductive success. The effects of hand pollination on fruit set, seed number and seedling fitness differed among years. Pollen tube growth and reproductive success did not differ between self- and cross-pollinations. Accordingly, a high self-compatibility index for the fruit set (SCI = 1.00) and the seed number (SCI = 0.98) and a low inbreeding depression at all developmental stages (cumulative delta = 0.126) suggest a high selfing ability. Finally, pollen origin had no effect on fruit and seed sets. CONCLUSIONS This andromonoecious species has the potential for a mixed mating system with high dependence on insect-mediated pollination. The selfing rate through geitonogamy should be important.
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Affiliation(s)
- Leonie C. Kouonon
- Laboratoire de Génétique, UFR des Sciences de la Nature, Université d'Abobo-Adjamé, 02 BP 801, Abidjan, Côte d'Ivoire
- Research group ‘Genetics, populations, reproduction’, Université catholique de Louvain, Croix-du-Sud 2, Box 14, B-1348 Louvain-la-Neuve, Belgium
| | - Anne-Laure Jacquemart
- Research group ‘Genetics, populations, reproduction’, Université catholique de Louvain, Croix-du-Sud 2, Box 14, B-1348 Louvain-la-Neuve, Belgium
| | - Arsene I. Zoro Bi
- Laboratoire de Génétique, UFR des Sciences de la Nature, Université d'Abobo-Adjamé, 02 BP 801, Abidjan, Côte d'Ivoire
| | - Pierre Bertin
- Unité d'écophysiologie et amélioration végétale, Université catholique de Louvain, Croix-du-Sud 2, Box 11, B-1348 Louvain-la-Neuve, Belgium
| | - Jean-Pierre Baudoin
- Unité de Phytotechnie tropicale et d'Horticulture, Faculté universitaire des sciences agronomiques, Passage des Déportés, 2, B-5030 Gembloux, Belgium
| | - Yao Dje
- Laboratoire de Génétique, UFR des Sciences de la Nature, Université d'Abobo-Adjamé, 02 BP 801, Abidjan, Côte d'Ivoire
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Abid G, Silue S, Muhovski Y, Jacquemin JM, Toussaint A, Baudoin JP. Role of myo-inositol phosphate synthase and sucrose synthase genes in plant seed development. Gene 2009; 439:1-10. [PMID: 19306919 DOI: 10.1016/j.gene.2009.03.007] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2008] [Revised: 03/07/2009] [Accepted: 03/11/2009] [Indexed: 11/25/2022]
Abstract
The aim of this review is to highlight the role of myo-inositol phosphate synthase (MIPS), which catalyses the first step in inositol biosynthesis and of sucrose synthase (Sus), an enzyme involved in UDP-glucose formation, the principal nucleoside diphosphate in the sucrose cleavage reaction and in trehalose biosynthesis. These two enzymes are involved in various physiological processes including seed growth and resistance to biotic and abiotic stresses. The study of mutated MIPS and Sus genes in some crops, such as soybean and cotton, has shown that these two proteins are directly involved in embryogenesis. They exhibit several isoforms that are essential for normal seed development. The possible role of both genes in seed development is discussed in this review.
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Affiliation(s)
- Ghassen Abid
- Unit of Tropical Crop Husbandry and Horticulture, Gembloux Agricultural University, Passage des Déportés 2, B-5030 Gembloux, Belgium.
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Koffi KK, Gbotto AA, Malice M, Djè Y, Bertin P, Baudoin JP, Zoro Bi IA. Morphological and allozyme variation in a collection of Cucumeropsis mannii Naudin (Cucurbitaceae) from Côte d'Ivoire. BIOCHEM SYST ECOL 2008. [DOI: 10.1016/j.bse.2008.07.008] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Baudoin JP, Alvarez C, Gaspar P, Métin C. Nocodazole-induced changes in microtubule dynamics impair the morphology and directionality of migrating medial ganglionic eminence cells. Dev Neurosci 2008; 30:132-43. [PMID: 18075261 DOI: 10.1159/000109858] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2006] [Accepted: 04/11/2007] [Indexed: 11/19/2022] Open
Abstract
We have shown previously that actomyosin contractility plays an important role in controlling nuclear movements in future interneurons born in the medial ganglionic eminence (MGE) [Bellion et al.: J Neurosci 2005;25:5691-5699]. Because microtubules are known to control the structural and motile properties of migrating neurons, we asked whether alterations in the dynamic instability of microtubules would impair MGE cell migration. Migration was analyzed in flat cocultures in which green-fluorescent-protein-expressing MGE cells migrate on cortical cells from their explant of origin. A low (100 nM) concentration of nocodazole shortened the leading process of MGE cells that nevertheless continued to migrate at the same rate but frequently changed their direction of migration relative to control cells. MGE cells treated with a higher (1 muM) concentration of nocodazole that strongly destabilized microtubules took on multipolar morphology. They extended thin and labile processes. MGE cells no longer exhibited directional migration and migration velocity slowed 2-fold. These results suggest that microtubule stability is crucial for maintaining polarity and controlling the directional migration of MGE cells, whereas additional mechanisms are required to control cell motility.
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