7 results on '"Pauline Coulon"'
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2. Antibodies as Models and Tools to Decipher Candida albicans Pathogenic Development: Review about a Unique Monoclonal Antibody Reacting with Immunomodulatory Adhesins
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Jordan Leroy, Karine Lecointe, Pauline Coulon, Boualem Sendid, Raymond Robert, and Daniel Poulain
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monoclonal antibody ,immunity ,Candida albicans ,diagnosis ,Biology (General) ,QH301-705.5 - Abstract
Candidiasis, caused mainly by Candida albicans, a natural commensal of the human digestive tract and vagina, is the most common opportunistic fungal infection at the mucosal and systemic levels. Its high morbi–mortality rates have led to considerable research to identify the molecular mechanisms associated with the switch to pathogenic development and to diagnose this process as accurately as possible. Since the 1980s, the advent of monoclonal antibody (mAb) technology has led to significant progress in both interrelated fields. This linear review, intended to be didactic, was prompted by considering how, over several decades, a single mAb designated 5B2 contributed to the elucidation of the molecular mechanisms of pathogenesis based on β-1,2-linked oligomannoside expression in Candida species. These contributions starting from the structural identification of the minimal epitope as a di-mannoside from the β-1,2 series consisted then in the demonstration that it was shared by a large number of cell wall proteins differently anchored in the cell wall and the discovery of a cell wall glycoplipid shed by the yeast in contact of host cells, the phospholipomannan. Cytological analysis revealed an overall highly complex epitope expression at the cell surface concerning all growth phases and a patchy distribution resulting from the merging of cytoplasmic vesicles to plasmalema and further secretion through cell wall channels. On the host side, the mAb 5B2 led to identification of Galectin-3 as the human receptor dedicated to β-mannosides and signal transduction pathways leading to cytokine secretion directing host immune responses. Clinical applications concerned in vivo imaging of Candida infectious foci, direct examination of clinical samples and detection of circulating serum antigens that complement the Platelia Ag test for an increased sensitivity of diagnosis. Finally, the most interesting character of mAb 5B2 is probably its ability to reveal C. albicans pathogenic behaviour in reacting specifically with vaginal secretions from women infected versus colonized by this species as well as to display higher reactivity with strains isolated in pathogenic circumstances or even linked to an unfavourable prognosis for systemic candidiasis. Together with a detailed referenced description of these studies, the review provides a complementary reading frame by listing the wide range of technologies involving mAb 5B2 over time, evidencing a practical robustness and versatility unique so far in the Candida field. Finally, the basic and clinical perspectives opened up by these studies are briefly discussed with regard to prospects for future applications of mAb 5B2 in current research challenges.
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- 2023
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3. First case of fatal bacteremia due to Nocardia neocaledoniensis
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Alexandre Regueme, Anne Vachee, Claire Duployez, Anne-Emilie Petit, Pauline Coulon, Frédéric Wallet, and Caroline Loiez
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Nocardia neocaledoniensis ,Bacteremia ,MALDI-TOF ,Infectious and parasitic diseases ,RC109-216 - Abstract
Nocardia neocaledoniensis is an uncommon cause of human-infections. Few cases are reported in the literature. We describe the first case of bacteremia caused by N. neocaledoniensis. This article underlines the importance of mass spectrometry for easy and rapid identification of such bacterium.
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- 2020
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4. Polysaccharides Cell Wall Architecture of Mucorales
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Karine Lecointe, Marjorie Cornu, Jordan Leroy, Pauline Coulon, and Boualem Sendid
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Mucorales ,polysaccharides ,cell wall ,glucuronic acid ,glyco-enzymes ,Microbiology ,QR1-502 - Abstract
Invasive fungal infections are some of the most life-threatening infectious diseases in the hospital setting. In industrialized countries, the most common fungal species isolated from immunocompromised patients are Candida and Aspergillus spp. However, the number of infections due to Mucorales spp. is constantly increasing and little is known about the virulence factors of these fungi. The fungal cell wall is an important structure protecting fungi from the environment. A better knowledge of its composition should improve our understanding of host-pathogen interactions. Cell wall molecules are involved in tissue adherence, immune escape strategies, and stimulation of host defenses including phagocytosis and mediators of humoral immunity. The fungal cell wall is also a target of choice for the development of diagnostic or therapeutic tools. The present review discusses our current knowledge on the cell wall structure of Mucorales in terms of the polysaccharides and glyco-enzymes involved in its biosynthesis and degradation, with an emphasis on the missing gaps in our knowledge.
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- 2019
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5. First case of fatal bacteremia due to Nocardia neocaledoniensis
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Frédéric Wallet, Pauline Coulon, Alexandre Regueme, A. Vachée, Anne-Emilie Petit, Caroline Loïez, and Claire Duployez
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0301 basic medicine ,MALDI-TOF ,Nocardia neocaledoniensis ,business.industry ,030106 microbiology ,Bacteremia ,Infectious and parasitic diseases ,RC109-216 ,medicine.disease ,bacterial infections and mycoses ,Article ,Microbiology ,Rapid identification ,03 medical and health sciences ,0302 clinical medicine ,Infectious Diseases ,Medicine ,030212 general & internal medicine ,business - Abstract
Highlights • First case of bacteremia due to N.neocaledoniensis in an immunocompromised patient. • Mass spectrometry is a discriminant technique to identify rapidly N.neocaledoniensis. • Incubating culture media for a longer time helps to obtain definitive diagnosis and adapt antibiotics., Nocardia neocaledoniensis is an uncommon cause of human-infections. Few cases are reported in the literature. We describe the first case of bacteremia caused by N. neocaledoniensis. This article underlines the importance of mass spectrometry for easy and rapid identification of such bacterium.
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- 2020
6. Routine drug resistance testing in HIV-1 proviral DNA, using an automated next- generation sequencing assay
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Faiza Ajana, Christophe Hallaert, Thomas Huleux, Didier Hober, Pauline Coulon, Agnès Meybeck, Enagnon Kazali Alidjinou, L. Bocket, and Olivier Robineau
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Adult ,Male ,0301 basic medicine ,Genotype ,Anti-HIV Agents ,Human Immunodeficiency Virus Proteins ,030106 microbiology ,HIV Infections ,Microbial Sensitivity Tests ,Computational biology ,Drug resistance ,DNA sequencing ,03 medical and health sciences ,symbols.namesake ,0302 clinical medicine ,Proviruses ,Virology ,Drug Resistance, Viral ,Humans ,030212 general & internal medicine ,Genotyping ,Gene ,Retrospective Studies ,Sanger sequencing ,biology ,High-Throughput Nucleotide Sequencing ,Sequence Analysis, DNA ,Middle Aged ,Viral Load ,Reverse transcriptase ,Integrase ,Infectious Diseases ,Mutation ,HIV-1 ,biology.protein ,symbols ,RNA, Viral ,Female - Abstract
Background HIV-1 DNA genotypic drug resistance testing is increasingly performed to guide treatment switching or simplification in controlled patients. The Sentosa NGS platform is a fully automated system marketed for drug resistance testing on HIV-1 RNA samples. Objectives The aim of this study was to evaluate this automated NGS solution for routine resistance genotypic resistance testing in proviral HIV-1 DNA. Study design Sanger sequencing (SS) of the reverse transcriptase (RT), protease (PR) and integrase (IN) genes was performed using the French ANRS protocol. NGS was performed retrospectively on frozen samples, using the Sentosa platform combined with the Sentosa SQ HIV genotyping Assay. Results A total of 77 samples were run once using NGS. A successful sequencing of the three HIV-1 genes (RT, PR, IN) was obtained for 45 samples. The number of cumulated RAMs was 179, 185 and 219 with SS, NGS 20% and NGS 10% respectively; however most of them were minor mutations in the PR region. The mutation detection rate was similar between SS and NGS 20%. Several discordances were observed between both methods in the RT and PR regions, mainly due to the use of different DNA extracts, and hypermutation. Conclusions HIV-1 DNA genotypic resistance testing can be performed with the Sentosa platform. Few technical optimizations are still needed to include the extraction step and to improve the sequencing efficiency.
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- 2019
7. Coronavirus Disease 2019-Associated Mucormycosis in France: A Rare but Deadly Complication
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Danion, François, Letscher-Bru, Valérie, Guitard, Juliette, Sitbon, Karine, Dellière, Sarah, Angoulvant, Adela, Desoubeaux, Guillaume, Botterel, Francoise, Bellanger, Anne-Pauline, Gargala, Gilles, Uhel, Fabrice, Bougnoux, Marie-Elisabeth, Gerber, Victor, Michel, Justin, Cornu, Marjorie, Bretagne, Stéphane, Lanternier, Fanny, Merdji, Hamid, Delabranche, Xavier, Parrot, Antoine, Voiriot, Guillaume, Urbina, Tomas, Mebazaa, Alexandre, Chousterman, Benjamin, el Kalioubie, Ahmed, Six, Sophie, Coulon, Pauline, Sendid, Boualem, Anguel, Nadia, Damoisel, Charles, Mussini, Charlotte, Villate, Alban, Navellou, Jean-Christophe, Girault, Christophe, Cassagne, Carole, Augereau, Olivier, Dromer, Francoise, Garcia-Hermoso, Dea, Lortholary, Olivier, Alanio, Alexandre, Center of Experimental and Molecular Medicine, Fédération de Médecine Translationnelle de Strasbourg (FMTS), Université de Strasbourg (UNISTRA), Immuno-Rhumatologie Moléculaire, Université de Strasbourg (UNISTRA)-Institut National de la Santé et de la Recherche Médicale (INSERM), Fédération Hospitalo-Universitaire (OMICARE), Centre de Recherche d’Immunologie et d’Hématologie [Strasbourg], CHU Strasbourg, Dynamique des interactions hôte pathogène (DIHP), Mucoviscidose: physiopathologie et phénogénomique [CRSA], Centre de Recherche Saint-Antoine (CRSA), Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Sorbonne Université (SU)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Sorbonne Université (SU), CHU Saint-Antoine [AP-HP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU), Mycologie moléculaire - Molecular Mycology, Institut Pasteur [Paris] (IP)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Centre National de Référence Mycoses Invasives et Antifongiques - National Reference Center Invasive Mycoses & Antifungals (CNRMA), Institut Pasteur [Paris] (IP)-Université Paris Cité (UPCité), Hopital Saint-Louis [AP-HP] (AP-HP), Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP), COVID-Mucor study group, Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Service de parasitologie, mycologie, médecine tropicale [CHRU Tours], Dynamic Microbiology - EA 7380 (DYNAMIC), École nationale vétérinaire - Alfort (ENVA)-Agence nationale de sécurité sanitaire de l'alimentation, de l'environnement et du travail (ANSES)-Université Paris-Est (UPE)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12), CHU Henri Mondor [Créteil], Service de parasitologie et mycologie [CHRU de Besançon], Centre Hospitalier Régional Universitaire de Besançon (CHRU Besançon), Laboratoire de Biologie Médicale de Référence Pneumopathie d'hypersensibilité, Laboratoire Chrono-environnement (UMR 6249) (LCE), Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC), CHU Necker - Enfants Malades [AP-HP], Aix Marseille Université (AMU), CHU Lille, Service de Médecine Intensive et Réanimation [Strasbourg], Les Hôpitaux Universitaires de Strasbourg (HUS), CHU Tenon [AP-HP], Unité de Glycobiologie Structurale et Fonctionnelle - UMR 8576 (UGSF), Université de Lille-Centre National de la Recherche Scientifique (CNRS), Institut National de la Santé et de la Recherche Médicale (INSERM), COVID-Mucor St Group Hamid Merdji (Médecine Intensive et Réanimation, Hôpitaux Universitaires de Strasbourg, Strasbourg, France), Xavier Delabranche (Réanimation Chirugicale, Hôpitaux Universitaires de Strasbourg, Strasbourg, France), Antoine Parrot (Service de Pneumologie, Hôpital Tenon, AP-HP, Paris, France), Guillaume Voiriot (Service de Médecine Intensive et Réanimation, Hôpital Tenon, AP-HP, Paris, France), Tomas Urbina (Service de Réanimation Médicale, Hôpital Saint Antoine, AP-HP, Paris, France), Alexandre Mebazaa (Réanimation Chirurgicale, Hôpital Saint-Louis, AP-HP, Paris, France), Benjamin Chousterman (Réanimation, Hôpital Lariboisière, AP-HP, Paris, France), Ahmed El Kalioubie (Réanimation, CHU de Lille), Sophie Six (Réanimation, CHU de Lille, Lille, France), Pauline Coulon and Boualem Sendid (Service de Mycologie, CHU de Lille, France), Nadia Anguel (Réanimation Médicale, Le Kremlin-Bicêtre, AP-HP, Paris, France), Charles Damoisel (Réanimation Polyvalente, Clamart, AP-HP, France), Charlotte Mussini (Service d’Anatomopathologie, Le Kremlin-Bicêtre, AP-HP, Paris, France), Alban Villate (Hématologie, Tours, France), Jean-Christophe Navellou (Réanimation, CHU Besançon, France), Christophe Girault (Médecine Intensive et Réanimation, CHU Rouen, France), Carole Cassagne (Laboratoire de Mycologie, CHU Timone, Marseille, France), Olivier Augereau (Laboratoire de Microbiologie, Colmar, France), Francoise Dromer, Dea Garcia-Hermoso, Olivier Lortholary, Alexandre Alanio (CNRMA, Institut Pasteur, Paris, France)., Vecteurs - Infections tropicales et méditerranéennes (VITROME), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut de Recherche Biomédicale des Armées (IRBA), and Institut Hospitalier Universitaire Méditerranée Infection (IHU Marseille)
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medicine.medical_specialty ,[SDV.MHEP.ME]Life Sciences [q-bio]/Human health and pathology/Emerging diseases ,CAM ,Coronavirus disease 2019 (COVID-19) ,business.industry ,Brief Report ,General surgery ,Mucormycosis ,COVID-19 ,CAPA ,medicine.disease ,[SDV.MP.BAC]Life Sciences [q-bio]/Microbiology and Parasitology/Bacteriology ,mucormycosis ,AcademicSubjects/MED00290 ,Infectious Diseases ,Oncology ,[SDV.MHEP.CSC]Life Sciences [q-bio]/Human health and pathology/Cardiology and cardiovascular system ,[SDV.MHEP.MI]Life Sciences [q-bio]/Human health and pathology/Infectious diseases ,[SDV.MP.VIR]Life Sciences [q-bio]/Microbiology and Parasitology/Virology ,medicine ,[SDV.MP.PAR]Life Sciences [q-bio]/Microbiology and Parasitology/Parasitology ,business ,Complication - Abstract
We studied COVID-19 associated mucormycosis based on 17 cases reported nationwide and assessed the differences with India. They differed by frequencies of diabetes mellitus (47% in France versus up to 95% in India), hematological malignancies (35% versus 1%), anatomical sites (12% versus >80% rhino-orbito-cerebral) and prognosis (88% mortality versus, We reported 17 cases of COVID-19 associated mucormycosis in France. Compared to India, they differed by frequencies of diabetes mellitus (47% versus up to 95% in India), hematological malignancies (35% versus 1%), anatomical sites and mortality (88% versus
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- 2022
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