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Samba-Louaka A, Labruyère E, Matondo M, Locard-Paulet M, Olivo-Marin JC, Guillen N. Encystation and Stress Responses under the Control of Ubiquitin-like Proteins in Pathogenic Amoebae. Microorganisms 2023; 11:2670. [PMID: 38004682 PMCID: PMC10673212 DOI: 10.3390/microorganisms11112670] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2023] [Revised: 10/21/2023] [Accepted: 10/24/2023] [Indexed: 11/26/2023] Open
Abstract
Amoebae found in aquatic and terrestrial environments encompass various pathogenic species, including the parasite Entamoeba histolytica and the free-living Acanthamoeba castellanii. Both microorganisms pose significant threats to public health, capable of inducing life-threatening effects on humans. These amoebae exist in two cellular forms: trophozoites and cysts. The trophozoite stage is the form used for growth and reproduction while the cyst stage is the resistant and disseminating form. Cysts occur after cellular metabolism slowdown due to nutritional deprivation or the appearance of environmental conditions unfavourable to the amoebae's growth and division. The initiation of encystation is accompanied by the activation of stress responses, and scarce data indicate that encystation shares factors and mechanisms identified in stress responses occurring in trophozoites exposed to toxic compounds derived from human immune defence. Although some "omics" analyses have explored how amoebae respond to diverse stresses, these studies remain limited and rarely report post-translational modifications that would provide knowledge on the molecular mechanisms underlying amoebae-specific stress responses. In this review, we discuss ubiquitin-like proteins associated with encystation and cell survival during oxidative damage. We aim to shed light on the signalling pathways involved in amoebic defence mechanisms, with a focus on their potential clinical implications against pathogenic amoebae, addressing the pressing need for effective therapies.
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Affiliation(s)
- Ascel Samba-Louaka
- Université de Poitiers, Centre National de la Recherche Scientifique UMR7267, Laboratoire Ecologie et Biologie des Interactions, TSA51106, 86073 Poitiers, France
| | - Elisabeth Labruyère
- Institut Pasteur, Biological Image Analysis Unit, Centre National de la Recherche Scientifique UMR3691, Université Paris Cité, 75015 Paris, France; (E.L.); (J.-C.O.-M.)
| | - Mariette Matondo
- Institut Pasteur, Proteomics Core Facility, Mass Spectrometry for Biology Unit, Centre National de la Recherche Scientifique UAR 2024, Université Paris Cité, 75015 Paris, France;
| | - Marie Locard-Paulet
- Institut de Pharmacologie et de Biologie Structurale, Centre National de la Recherche Scientifique UMR 5089, Université Toulouse III-Paul Sabatier, 31077 Toulouse, France;
- Infrastructure Nationale de Proteomique ProFI—FR2048, 2048 Toulouse, France
| | - Jean-Christophe Olivo-Marin
- Institut Pasteur, Biological Image Analysis Unit, Centre National de la Recherche Scientifique UMR3691, Université Paris Cité, 75015 Paris, France; (E.L.); (J.-C.O.-M.)
| | - Nancy Guillen
- Institut Pasteur, Biological Image Analysis Unit, Centre National de la Recherche Scientifique UMR3691, Université Paris Cité, 75015 Paris, France; (E.L.); (J.-C.O.-M.)
- Institut Pasteur, Centre National de la Recherche Scientifique ERL9195, 75015 Paris, France
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Sinonasal Amoebiasis: An Unexpected Cause of Sinonasal Necroinflammatory Disease. Am J Surg Pathol 2023; 47:102-110. [PMID: 35968953 DOI: 10.1097/pas.0000000000001951] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
While amoebic infection is widely known as a cause of gastroenteritis, keratitis, and meningoencephalitis, amoebae are challenging to recognize at unexpected sites. Despite multiple case reports of sinonasal amoebiasis, amoebic infection is not regularly considered in the differential diagnosis of sinonasal necroinflammatory disease. Here, we aim to characterize the pathologic features of sinonasal amoebiasis to facilitate better recognition. We identified sinonasal amoebiasis in 4 men, median age of 67 years (range: 37 to 71 y). All were immunocompromised, including 2 with chronic lymphocytic leukemia, 1 with human immunodeficiency virus, and 1 with human immunodeficiency virus and kidney transplant. Patients presented with nasal mucosal necrosis or polypoid masses, with facial ulceration in 1 patient and distant dermal nodules in another. Biopsies displayed extensive necrotic debris and inflammation. Although amoebic cysts were abundant in 3 cases, they were mistaken for yeast at frozen section in 1 case; 1 case showed only rare trophozoites that were not recognized on initial biopsy. Periodic acid Schiff and Grocott Methenamine Silver stains highlighted the organisms, and polymerase chain reaction confirmed Acanthamoeba species in 3 cases tested. 2 patients responded well to antiprotozoal medications, but 2 died of disease. Overall, sinonasal amoebiasis presents as a necroinflammatory process in patients immunocompromised for various reasons. Amoebae can mimic other organisms or be incredibly scarce, requiring active consideration to recognize amoebiasis and differentiate it from overlapping conditions like invasive fungal sinusitis, granulomatosis with polyangiitis, and natural killer/T-cell lymphoma. Because sinonasal amoebiasis is highly treatable when diagnosed promptly, pathologists play a critical role in the recognition of this rare necroinflammatory disease.
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Acanthamoeba spp. monoclonal antibody against a CPA2 transporter: a promising molecular tool for acanthamoebiasis diagnosis and encystment study. Parasitology 2020; 147:1678-1688. [PMID: 32951614 DOI: 10.1017/s0031182020001778] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Free-living amoeba of the genus Acanthamoeba are ubiquitous protozoa involved in opportunistic and non-opportunistic infection in humans, such as granulomatous amoebic encephalitis and amoebic keratitis. Both infections have challenging characteristics such as the formation of the resistant cysts in infected tissues, hampering the treatment and most usual diagnosis depending on time-consuming and/or low sensitivity techniques. The use of monoclonal antibodies presents itself as an opportunity for the development of more effective alternative diagnostic methods, as well as an important and useful tool in the search for new therapeutic targets. This study investigated the possibility of using a previously produced monoclonal antibody (mAb3), as a diagnostic tool for the detection of Acanthamoeba trophozoites by direct and indirect flow cytometry and immunofluorescence. Immunoprecipitation assay and mass spectrometry allowed the isolation of the antibody's target and suggested it is a transporter part of the CPA (cation: proton antiporter) superfamily. In vitro tests indicate an important role of this target in Acanthamoeba's encystment physiology. Our results support the importance of studying the role of CPA2 transporters in the context of acanthamoebiasis, as this may be a way to identify new therapeutic candidates.
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Li P, Vassiliadis D, Ong SY, Bennett-Wood V, Sugimoto C, Yamagishi J, Hartland EL, Pasricha S. Legionella pneumophila Infection Rewires the Acanthamoeba castellanii Transcriptome, Highlighting a Class of Sirtuin Genes. Front Cell Infect Microbiol 2020; 10:428. [PMID: 32974218 PMCID: PMC7468528 DOI: 10.3389/fcimb.2020.00428] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2020] [Accepted: 07/14/2020] [Indexed: 12/13/2022] Open
Abstract
Legionella pneumophila is an environmental bacterium that has evolved to survive predation by soil and water amoebae such as Acanthamoeba castellanii, and this has inadvertently led to the ability of L. pneumophila to survive and replicate in human cells. L. pneumophila causes Legionnaire's Disease, with human exposure occurring via the inhalation of water aerosols containing both amoebae and the bacteria. These aerosols originate from aquatic biofilms found in artifical water sources, such as air-conditioning cooling towers and humidifiers. In these man-made environments, A. castellanii supports L. pneumophila intracellular replication, thereby promoting persistence and dissemination of the bacteria and providing protection from external stress. Despite this close evolutionary relationship, very little is known about how A. castellanii responds to L. pneumophila infection. In this study, we examined the global transcriptional response of A. castellanii to L. pneumophila infection. We compared A. castellanii infected with wild type L. pneumophila to A. castellanii infected with an isogenic ΔdotA mutant strain, which is unable to replicate intracellularly. We showed that A. castellanii underwent clear morphological and transcriptional rewiring over the course of L. pneumophila infection. Through improved annotation of the A. castellanii genome, we determined that these transcriptional changes primarily involved biological processes utilizing small GTPases, including cellular transport, signaling, metabolism and replication. In addition, a number of sirtuin-encoding genes in A. castellanii were found to be conserved and upregulated during L. pneumophila infection. Silencing of sirtuin gene, sir6f (ACA1_153540) resulted in the inhibition of A. castellanii cell proliferation during infection and reduced L. pneumophila replication. Overall our findings identified several biological pathways in amoebae that may support L. pneumophila replication and A. castellanii proliferation in environmental conditions.
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Affiliation(s)
- Pengfei Li
- Centre for Innate Immunity and Infectious Diseases, Hudson Institute of Medical Research, Clayton, VIC, Australia.,Department of Microbiology and Immunology, University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, VIC, Australia
| | - Dane Vassiliadis
- Cancer Research Division, Peter MacCallum Cancer Centre, Melbourne, VIC, Australia
| | - Sze Ying Ong
- Centre for Innate Immunity and Infectious Diseases, Hudson Institute of Medical Research, Clayton, VIC, Australia
| | - Vicki Bennett-Wood
- Department of Microbiology and Immunology, University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, VIC, Australia
| | - Chihiro Sugimoto
- Global Station for Zoonosis Control, GI-CoRE, Hokkaido University, Sapporo, Japan.,Research Center for Zoonosis Control, Hokkaido University, Sapporo, Japan
| | - Junya Yamagishi
- Global Station for Zoonosis Control, GI-CoRE, Hokkaido University, Sapporo, Japan.,Research Center for Zoonosis Control, Hokkaido University, Sapporo, Japan
| | - Elizabeth L Hartland
- Centre for Innate Immunity and Infectious Diseases, Hudson Institute of Medical Research, Clayton, VIC, Australia.,Department of Microbiology and Immunology, University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, VIC, Australia.,Research Center for Zoonosis Control, Hokkaido University, Sapporo, Japan.,Department of Molecular and Translational Science, Monash University, Clayton, VIC, Australia
| | - Shivani Pasricha
- Centre for Innate Immunity and Infectious Diseases, Hudson Institute of Medical Research, Clayton, VIC, Australia.,Department of Microbiology and Immunology, University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, VIC, Australia
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Garajová M, Mrva M, Vaškovicová N, Martinka M, Melicherová J, Valigurová A. Cellulose fibrils formation and organisation of cytoskeleton during encystment are essential for Acanthamoeba cyst wall architecture. Sci Rep 2019; 9:4466. [PMID: 30872791 PMCID: PMC6418277 DOI: 10.1038/s41598-019-41084-6] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2018] [Accepted: 03/01/2019] [Indexed: 01/26/2023] Open
Abstract
Acanthamoebae success as human pathogens is largely due to the highly resistant cysts which represent a crucial problem in treatment of Acanthamoeba infections. Hence, the study of cyst wall composition and encystment play an important role in finding new therapeutic strategies. For the first time, we detected high activity of cytoskeletal elements - microtubular networks and filamentous actin, in late phases of encystment. Cellulose fibrils - the main components of endocyst were demonstrated in inter-cystic space, and finally in the ectocyst, hereby proving the presence of cellulose in both layers of the cyst wall. We detected clustering of intramembranous particles (IMPs) and their density alterations in cytoplasmic membrane during encystment. We propose a hypothesis that in the phase of endocyst formation, the IMP clusters represent cellulose microfibril terminal complexes involved in cellulose synthesis that after cyst wall completion are reduced. Cyst wall impermeability, due largely to a complex polysaccharide (glycans, mainly cellulose) has been shown to be responsible for Acanthamoeba biocide resistance and cellulose biosynthesis pathway is suggested to be a potential target in treatment of Acanthamoeba infections. Disruption of this pathway would affect the synthesis of cyst wall and reduce considerably the resistance to chemotherapeutic agents.
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Affiliation(s)
- Mária Garajová
- Department of Zoology, Faculty of Natural Sciences, Comenius University in Bratislava, 842 15, Bratislava, Slovak Republic.
| | - Martin Mrva
- Department of Zoology, Faculty of Natural Sciences, Comenius University in Bratislava, 842 15, Bratislava, Slovak Republic
| | - Naděžda Vaškovicová
- Institute of Scientific Instruments, Czech Academy of Sciences, 612 64, Brno, Czech Republic
| | - Michal Martinka
- Department of Plant Physiology, Faculty of Natural Sciences, Comenius University in Bratislava, 842 15, Bratislava, Slovak Republic
| | - Janka Melicherová
- Department of Botany and Zoology, Faculty of Science, Masaryk University, 611 37, Brno, Czech Republic
| | - Andrea Valigurová
- Department of Botany and Zoology, Faculty of Science, Masaryk University, 611 37, Brno, Czech Republic
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Van der Henst C, Vanhove AS, Drebes Dörr NC, Stutzmann S, Stoudmann C, Clerc S, Scrignari T, Maclachlan C, Knott G, Blokesch M. Molecular insights into Vibrio cholerae's intra-amoebal host-pathogen interactions. Nat Commun 2018; 9:3460. [PMID: 30150745 PMCID: PMC6110790 DOI: 10.1038/s41467-018-05976-x] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2017] [Accepted: 08/07/2018] [Indexed: 01/03/2023] Open
Abstract
Vibrio cholerae, which causes the diarrheal disease cholera, is a species of bacteria commonly found in aquatic habitats. Within such environments, the bacterium must defend itself against predatory protozoan grazers. Amoebae are prominent grazers, with Acanthamoeba castellanii being one of the best-studied aquatic amoebae. We previously showed that V. cholerae resists digestion by A. castellanii and establishes a replication niche within the host's osmoregulatory organelle. In this study, we decipher the molecular mechanisms involved in the maintenance of V. cholerae's intra-amoebal replication niche and its ultimate escape from the succumbed host. We demonstrate that minor virulence features important for disease in mammals, such as extracellular enzymes and flagellum-based motility, have a key role in the replication and transmission of V. cholerae in its aqueous environment. This work, therefore, describes new mechanisms that provide the pathogen with a fitness advantage in its primary habitat, which may have contributed to the emergence of these minor virulence factors in the species V. cholerae.
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Affiliation(s)
- Charles Van der Henst
- Laboratory of Molecular Microbiology, Global Health Institute, School of Life Sciences, Station 19, EPFL-SV-UPBLO, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015, Lausanne, Switzerland
| | - Audrey Sophie Vanhove
- Laboratory of Molecular Microbiology, Global Health Institute, School of Life Sciences, Station 19, EPFL-SV-UPBLO, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015, Lausanne, Switzerland
| | - Natália Carolina Drebes Dörr
- Laboratory of Molecular Microbiology, Global Health Institute, School of Life Sciences, Station 19, EPFL-SV-UPBLO, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015, Lausanne, Switzerland
| | - Sandrine Stutzmann
- Laboratory of Molecular Microbiology, Global Health Institute, School of Life Sciences, Station 19, EPFL-SV-UPBLO, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015, Lausanne, Switzerland
| | - Candice Stoudmann
- Laboratory of Molecular Microbiology, Global Health Institute, School of Life Sciences, Station 19, EPFL-SV-UPBLO, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015, Lausanne, Switzerland
| | - Stéphanie Clerc
- Bioelectron Microscopy Core Facility (BioEM), School of Life Sciences, Station 19, EPFL-SV-PTBIOEM, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015, Lausanne, Switzerland
| | - Tiziana Scrignari
- Laboratory of Molecular Microbiology, Global Health Institute, School of Life Sciences, Station 19, EPFL-SV-UPBLO, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015, Lausanne, Switzerland
| | - Catherine Maclachlan
- Bioelectron Microscopy Core Facility (BioEM), School of Life Sciences, Station 19, EPFL-SV-PTBIOEM, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015, Lausanne, Switzerland
| | - Graham Knott
- Bioelectron Microscopy Core Facility (BioEM), School of Life Sciences, Station 19, EPFL-SV-PTBIOEM, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015, Lausanne, Switzerland
| | - Melanie Blokesch
- Laboratory of Molecular Microbiology, Global Health Institute, School of Life Sciences, Station 19, EPFL-SV-UPBLO, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015, Lausanne, Switzerland.
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7
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Mengue L, Richard FJ, Caubet Y, Rolland S, Héchard Y, Samba-Louaka A. Legionella pneumophila decreases velocity of Acanthamoeba castellanii. Exp Parasitol 2017; 183:124-127. [PMID: 28778742 DOI: 10.1016/j.exppara.2017.07.013] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2017] [Revised: 07/04/2017] [Accepted: 07/30/2017] [Indexed: 11/26/2022]
Abstract
Acanthamoeba castellanii is a free-living amoeba commonly found in aquatic environment. It feeds on bacteria even if some bacteria resist amoebal digestion. Thus, A. castellanii is described as a Trojan horse able to harbor pathogenic bacteria. L. pneumophila is one of the amoeba-resisting bacteria able to avoid host degradation by phagocytosis and to multiply inside the amoeba. When infecting its host, L. pneumophila injects hundreds of effectors via a type IV secretion system that change physiology of the amoeba to its profit. In this study, we assess mobility of A. castellanii upon infection with L. pneumophila. Electron-microscopy analysis of amoebae revealed a reduction of acanthopodia on cells infected with L. pneumophila. Analysis of velocity showed that migration of A. castellanii infected with L. pneumophila was significantly impaired compare to uninfected cells. Taken together, infection with L. pneumophila could prevent formation of cytoplasmic extensions such as acanthopodia with consequences on the shape, adherence and mobility of A. castellanii.
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Affiliation(s)
- Luce Mengue
- Laboratoire Ecologie et Biologie des Interactions, Université de Poitiers, UMR CNRS 7267, Poitiers, France
| | - Freddie-Jeanne Richard
- Laboratoire Ecologie et Biologie des Interactions, Université de Poitiers, UMR CNRS 7267, Poitiers, France
| | - Yves Caubet
- Laboratoire Ecologie et Biologie des Interactions, Université de Poitiers, UMR CNRS 7267, Poitiers, France
| | - Steven Rolland
- Laboratoire Ecologie et Biologie des Interactions, Université de Poitiers, UMR CNRS 7267, Poitiers, France
| | - Yann Héchard
- Laboratoire Ecologie et Biologie des Interactions, Université de Poitiers, UMR CNRS 7267, Poitiers, France
| | - Ascel Samba-Louaka
- Laboratoire Ecologie et Biologie des Interactions, Université de Poitiers, UMR CNRS 7267, Poitiers, France.
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Legionella pneumophila prevents proliferation of its natural host Acanthamoeba castellanii. Sci Rep 2016; 6:36448. [PMID: 27805070 PMCID: PMC5091012 DOI: 10.1038/srep36448] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2016] [Accepted: 10/14/2016] [Indexed: 12/12/2022] Open
Abstract
Legionella pneumophila is a ubiquitous, pathogenic, Gram-negative bacterium responsible for legionellosis. Like many other amoeba-resistant microorganisms, L. pneumophila resists host clearance and multiplies inside the cell. Through its Dot/Icm type IV secretion system, the bacterium injects more than three hundred effectors that modulate host cell physiology in order to promote its own intracellular replication. Here we report that L. pneumophila prevents proliferation of its natural host Acanthamoeba castellanii. Infected amoebae could not undergo DNA replication and no cell division was observed. The Dot/Icm secretion system was necessary for L. pneumophila to prevent the eukaryotic proliferation. The absence of proliferation was associated with altered amoebal morphology and with a decrease of mRNA transcript levels of CDC2b, a putative regulator of the A. castellanii cell cycle. Complementation of CDC28-deficient Saccharomyces cerevisiae by the CDC2b cDNA was sufficient to restore proliferation of CDC28-deficient S. cerevisiae and suggests for the first time that CDC2b from A. castellanii could be functional and a bona fide cyclin-dependent kinase. Hence, our results reveal that L. pneumophila impairs proliferation of A. castellanii and this effect could involve the cell cycle protein CDC2b.
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Van der Henst C, Scrignari T, Maclachlan C, Blokesch M. An intracellular replication niche for Vibrio cholerae in the amoeba Acanthamoeba castellanii. ISME JOURNAL 2015; 10:897-910. [PMID: 26394005 PMCID: PMC4705440 DOI: 10.1038/ismej.2015.165] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/24/2015] [Revised: 08/02/2015] [Accepted: 08/10/2015] [Indexed: 12/25/2022]
Abstract
Vibrio cholerae is a human pathogen and the causative agent of cholera. The persistence of this bacterium in aquatic environments is a key epidemiological concern, as cholera is transmitted through contaminated water. Predatory protists, such as amoebae, are major regulators of bacterial populations in such environments. Therefore, we investigated the interaction between V. cholerae and the amoeba Acanthamoeba castellanii at the single-cell level. We observed that V. cholerae can resist intracellular killing. The non-digested bacteria were either released or, alternatively, established a replication niche within the contractile vacuole of A. castellanii. V. cholerae was maintained within this compartment even upon encystment. The pathogen ultimately returned to its aquatic habitat through lysis of A. castellanii, a process that was dependent on the production of extracellular polysaccharide by the pathogen. This study reinforces the concept that V. cholerae is a facultative intracellular bacterium and describes a new host–pathogen interaction.
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Affiliation(s)
- Charles Van der Henst
- Laboratory of Molecular Microbiology, Global Health Institute, School of Life Sciences, Station 19, EPFL-SV-UPBLO, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - Tiziana Scrignari
- Laboratory of Molecular Microbiology, Global Health Institute, School of Life Sciences, Station 19, EPFL-SV-UPBLO, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - Catherine Maclachlan
- Bioelectron Microscopy Core Facility (BioEM), School of Life Sciences, Station 19, EPFL-SV-PTBIOEM, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - Melanie Blokesch
- Laboratory of Molecular Microbiology, Global Health Institute, School of Life Sciences, Station 19, EPFL-SV-UPBLO, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
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Molecular cloning and expression of phosphoglycerate dehydrogenase and phosphoserine aminotransferase in the serine biosynthetic pathway from Acanthamoeba castellanii. Parasitol Res 2015; 114:1387-95. [PMID: 25622549 DOI: 10.1007/s00436-015-4317-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2014] [Accepted: 01/07/2015] [Indexed: 10/24/2022]
Abstract
Free-living amoebae of the genus Acanthamoeba are widespread protozoans that can cause serious infectious diseases. This study characterised phosphoglycerate dehydrogenase (PGDH) and phosphoserine aminotransferase (PSAT) in the phosphorylated serine biosynthetic pathway of Acanthamoeba castellanii. The PGDH gene encodes a protein of 442 amino acids with a calculated molecular weight of 47.7 kDa and an isoelectric point (pI) of 7.64. Meanwhile, the PSAT gene encodes a protein of 394 amino acids with a calculated molecular weight of 43.8 kDa and a pI of 5.80. Confocal microscopy suggests that PGDH is mainly diffused in the cytoplasm, whereas PSAT is located in the inner part of the cell membrane. The messenger RNA (mRNA) expression levels of PGDH and PSAT vary depending on growth state under consecutive culture conditions. No significant changes in the mRNA expression levels of both PGDH and PSAT occur after the incubation of L-serine with Acanthamoeba. This result indicates that exogenous serine exerts no influence on the expression of these genes and that the so-called feedback inhibition of both PGDH and PSAT in Acanthamoeba differs from that in bacteria or other organisms. We propose that the enzymes in the phosphorylated serine biosynthetic pathway function in amoeba growth and proliferation.
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Fouque E, Yefimova M, Trouilhé MC, Quellard N, Fernandez B, Rodier MH, Thomas V, Humeau P, Héchard Y. Morphological Study of the Encystment and Excystment of Vermamoeba vermiformis
Revealed Original Traits. J Eukaryot Microbiol 2014; 62:327-37. [DOI: 10.1111/jeu.12185] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2014] [Revised: 08/19/2014] [Accepted: 08/25/2014] [Indexed: 11/30/2022]
Affiliation(s)
- Emilie Fouque
- Université de Poitiers; UMR CNRS 7267; Ecologie et Biologie des Interactions (EBI); 1 rue G. Bonnet 86073 Poitiers Cedex France
- Sechenov Institute of Evolutionary Physiology and Biochemistry; Russian Academy of Sciences; 194223 Saint-Petersburg Russia
| | - Marina Yefimova
- Université de Poitiers; ERL 7368 CNRS; Signalisation et Transports Ioniques Membranaires (STIM); 1 rue G. Bonnet 86073 Poitiers Cedex France
- Sechenov Institute of Evolutionary Physiology and Biochemistry; Russian Academy of Sciences; 194223 Saint-Petersburg Russia
| | - Marie-Cécile Trouilhé
- Scientific and Technical Center for Building; AQUASIM; 11 rue Henri Picherit BP 82341 44323 Nantes Cedex 3 France
| | - Nathalie Quellard
- Université de Poitiers; Service d'Anatomie et Cytologie Pathologiques; CHU de Poitiers; 2 rue de la Milétrie 86000 Poitiers France
| | - Béatrice Fernandez
- Université de Poitiers; Service d'Anatomie et Cytologie Pathologiques; CHU de Poitiers; 2 rue de la Milétrie 86000 Poitiers France
| | - Marie-Hélène Rodier
- Université de Poitiers; UMR CNRS 7267; Ecologie et Biologie des Interactions (EBI); 1 rue G. Bonnet 86073 Poitiers Cedex France
| | | | - Philippe Humeau
- Scientific and Technical Center for Building; AQUASIM; 11 rue Henri Picherit BP 82341 44323 Nantes Cedex 3 France
| | - Yann Héchard
- Université de Poitiers; UMR CNRS 7267; Ecologie et Biologie des Interactions (EBI); 1 rue G. Bonnet 86073 Poitiers Cedex France
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