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https://www.readbyqxmd.com/read/28929019/heterologous-expression-of-plasmodium-vivax-apical-membrane-antigen-1-pvama1-for-binding-peptide-selection
#1
Ching Hoong Chew, Yvonne Ai Lian Lim, Kek Heng Chua
BACKGROUND: Plasmodium is an obligate intracellular parasite. Apical membrane antigen 1 (AMA1) is the most prominent and well characterized malarial surface antigen that is essential for parasite-host cell invasion, i.e., for sporozoite to invade and replicate within hepatocytes in the liver stage and merozoite to penetrate and replicate within erythrocytes in the blood stage. AMA1 has long served as a potent antimalarial drug target and is a pivotal vaccine candidate. A good understanding of the structure and molecular function of this Plasmodium protein, particularly its involvement in host-cell adhesion and invasion, is of great interest and hence it offers an attractive target for the development of novel therapeutics...
2017: PeerJ
https://www.readbyqxmd.com/read/28927276/alkoxycarbonate-ester-prodrugs-of-preclinical-drug-candidate-elq-300-for-prophylaxis-and-treatment-of-malaria
#2
Lisa Frueh, Yuexin Li, Michael Mather, Qigui Li, Sovitj Pou, Aaron Nilsen, Rolf W Winter, Isaac Forquer, April Pershing, Lisa H Xie, Martin J Smilkstein, Diana Caridha, Robert F Campbell, Richard J Sciotti, Mara Kreishman-Deitrick, Jane X Kelly, Brian Andrew Vesely, Akhil Vaidya, Michael K Riscoe
ELQ-300 is a preclinical antimalarial drug candidate that is active against liver, blood, and transmission stages of Plasmodium falciparum. While ELQ-300 is highly effective when administered in a low multi-dose regimen, poor aqueous solubility and high crystallinity have hindered its clinical development. To overcome its challenging physiochemical properties, a number of bioreversible alkoxycarbonate ester prodrugs of ELQ-300 were synthesized. These bioreversible prodrugs are converted to ELQ-300 by host and parasite esterase action in the liver and bloodstream of the host...
September 19, 2017: ACS Infectious Diseases
https://www.readbyqxmd.com/read/28923058/a-model-of-plasmodium-vivax-concealment-based-on-plasmodium-cynomolgi-infections-in-macaca-mulatta
#3
Luis L Fonseca, Chester J Joyner, Mary R Galinski, Eberhard O Voit
BACKGROUND: Plasmodium vivax can cause severe malaria. The total parasite biomass during infections is correlated with the severity of disease but not necessarily quantified accurately by microscopy. This finding has raised the question whether there could be sub-populations of parasites that are not observed in peripheral blood smears but continue to contribute to the increase in parasite numbers that drive pathogenesis. Non-human primate infection models utilizing the closely related simian malaria parasite Plasmodium cynomolgi hold the potential for quantifying the magnitude of possibly unobserved infected red blood cell (iRBC) populations and determining how the presence of this hidden reservoir correlates with disease severity...
September 18, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28922459/therapeutic-plasma-exchange-in-the-treatment-of-complicated-plasmodium-falciparum-malaria-a-case-report
#4
Tsong-Yih Ou, Cheng-Yen Chuang, Chun-Da Chen, Chung-Yi Cheng
Severe falciparum malaria is associated with multiple organ dysfunction and a high rate of fatal outcome. Malaria is a world-wide disease in tropical areas through the bites of vector mosquitoes. Parasitic protozoans introduced by the mosquito's saliva to the blood travel to the liver then mature and reproduce. In humans, malaria is caused by Plasmodium falciparum, P. malariae, P. ovale, P. vivax, and P. knowlesi, and P. falciparum causes most deaths. Typical malaria symptoms include fever, chills, fatigue, headache, nausea, and vomiting...
September 18, 2017: Journal of Clinical Apheresis
https://www.readbyqxmd.com/read/28922424/deletion-of-the-rodent-malaria-ortholog-for-falcipain-1-highlights-differences-between-hepatic-and-blood-stage-merozoites
#5
Christine S Hopp, Brandy L Bennett, Satish Mishra, Christine Lehmann, Kirsten K Hanson, Jing-Wen Lin, Kimberly Rousseau, Filomena A Carvalho, Wouter A van der Linden, Nuno C Santos, Matthew Bogyo, Shahid M Khan, Volker Heussler, Photini Sinnis
Proteases have been implicated in a variety of developmental processes during the malaria parasite lifecycle. In particular, invasion and egress of the parasite from the infected hepatocyte and erythrocyte, critically depend on protease activity. Although falcipain-1 was the first cysteine protease to be characterized in P. falciparum, its role in the lifecycle of the parasite has been the subject of some controversy. While an inhibitor of falcipain-1 blocked erythrocyte invasion by merozoites, two independent studies showed that falcipain-1 disruption did not affect growth of blood stage parasites...
September 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28920778/first-report-of-trypanosoma-evansi-infection-surra-in-a-puma-felis-concolor-of-lahore-zoo-pakistan
#6
Imran Rashid, Haroon Akbar, Mohamed Gharbi, Farooq Riaz, Saher Islam, Muhammad Baber Saleem, Sammuel Shahzad, Wasim Shehzad, Mariem Rouatbi, Kamran Ashraf
The blood protozoan Trypanosoma evansi, which is transmitted by biting flies, is frequently neglected due to subclinical infections. This report describes a case of trypanosomiasis due to T. evansi in a 9-yr-old male puma (Felis concolor) housed at the Lahore Zoo in Pakistan. Early in January 2015, this male puma presented with chronic lethargy, weight loss, incoordination, hyperthermia, anorexia, sunken eyes, and unthriftiness. Microscopic examination of Giemsa-stained blood smears showed numerous Trypanosoma parasites...
September 2017: Journal of Zoo and Wildlife Medicine: Official Publication of the American Association of Zoo Veterinarians
https://www.readbyqxmd.com/read/28917540/galba-truncatula-and-fasciola-hepatica-genetic-costructures-and-interactions-with-intermediate-host-dispersal
#7
Ana C Correa, Thierry De Meeûs, Gilles Dreyfuss, Daniel Rondelaud, Sylvie Hurtrez-Boussès
Antagonistic interactions between hosts and parasites are key structuring forces in natural populations. Demographic factors like extinction, migration and the effective population size shape host-parasite metapopulational dynamics. Therefore, to understand the evolution of host-parasite systems it is necessary to study the distribution of the genetic variation of both entities simultaneously. In this paper, we investigate the population genetics co-structure of parasites and hosts within a metapopulation of the liver fluke, Fasciola hepatica, and two of its intermediate hosts, the main intermediate host in Europe, Galba truncatula, and a new intermediate host, Omphiscola glabra, in Central France...
September 13, 2017: Infection, Genetics and Evolution
https://www.readbyqxmd.com/read/28916755/protein-o-fucosylation-in-plasmodium-falciparum-ensures-efficient-infection-of-mosquito-and-vertebrate-hosts
#8
Sash Lopaticki, Annie S P Yang, Alan John, Nichollas E Scott, James P Lingford, Matthew T O'Neill, Sara M Erickson, Nicole C McKenzie, Charlie Jennison, Lachlan W Whitehead, Donna N Douglas, Norman M Kneteman, Ethan D Goddard-Borger, Justin A Boddey
O-glycosylation of the Plasmodium sporozoite surface proteins CSP and TRAP was recently identified, but the role of this modification in the parasite life cycle and its relevance to vaccine design remain unclear. Here, we identify the Plasmodium protein O-fucosyltransferase (POFUT2) responsible for O-glycosylating CSP and TRAP. Genetic disruption of POFUT2 in Plasmodium falciparum results in ookinetes that are attenuated for colonizing the mosquito midgut, an essential step in malaria transmission. Some POFUT2-deficient parasites mature into salivary gland sporozoites although they are impaired for gliding motility, cell traversal, hepatocyte invasion, and production of exoerythrocytic forms in humanized chimeric liver mice...
September 15, 2017: Nature Communications
https://www.readbyqxmd.com/read/28916307/extreme-conservation-of-mirna-complements-in-opisthorchiids
#9
Vladimir Y Ovchinnikov, Viatcheslav A Mordvinov, Bastian Fromm
MicroRNAs (miRNAs) are important gene regulators that are key players in animal development and diseases. They are excreted in extracellular vesicles and because they were shown to be taken up by host cells they have been proposed as mediators of parasite-host communication, and potential biomarkers for the detection of parasitic infections from host blood. Consequently, it is crucial to precisely know the miRNA complements of medically important agents such as the liver flukes of the Opisthorchiidae. Using publicly available and new datasets we curated and reannotated the surprisingly small and variable miRNA complements previously described for Opisthorchis viverrini, O...
September 12, 2017: Parasitology International
https://www.readbyqxmd.com/read/28915996/alternative-strategy-for-visceral-leishmaniosis-control-hisak70-salmonella-choleraesuis-pulsed-dendritic-cells
#10
Gustavo Domínguez-Bernal, Abel Martínez-Rodrigo, Alicia Mas, M Mar Blanco, José A Orden, Ricardo De La Fuente, Javier Carrión
Here, we describe a novel approach that exploits an attenuated mutant of Salmonella enterica serovar Choleraesuis as carrier to deliver a plasmid encoding protein HisAK70. Subsequently, dendritic cells (DCs) were pulsed with this vaccine vector. The aim of this study was to evaluate the effectiveness of the prepared HisAK70-S. Choleraesuis-pulsed DCs (HisAK70-SAL DCs) against visceral leishmaniosis (VL). In our ex vivo model of infection, the prepared formulations could decrease parasite growth by up to 80% by augmenting the production of IL-12p40 and by reducing arginase activity (ARG)...
October 2017: Comparative Immunology, Microbiology and Infectious Diseases
https://www.readbyqxmd.com/read/28910747/transcriptome-analysis-of-rana-chensinensis-liver-under-trichlorfon-stress
#11
Yu Ma, Bo Li, Yang Ke, Yongan Zhang, Yuhui Zhang
Trichlorfon is a selective organophosphate insecticide that is widely applied in aquaculture and agriculture for control of various parasites. However, repeated and excess applications of trichlorfon often lead to water pollution and threaten non-targeted species. Our previous studies showed that trichlorfon could cause oxidative stress, lipid peroxidation and hepatic lesions in the liver of Rana chensinensis, but the related molecular mechanisms remain unclear. To explore the interference of trichlorfon in gene transcription, the differentially expressed genes in the liver of R...
September 11, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28905265/occurrence-and-effect-of-trematode-metacercariae-in-two-endangered-killifishes-from-greece
#12
Eleni Kalogianni, Nikol Kmentová, Eileen Harris, Brian Zimmerman, Sofia Giakoumi, Yorgos Chatzinikolaou, Maarten P M Vanhove
We report digeneans (Diplostomidae, Crassiphialinae) in the endangered freshwater fishes Valencia letourneuxi and Valencia robertae, endemics of Western Greece. Digenean metacercariae occurred in two forms in the abdominal cavity, excysted and encysted, the latter attached to the gonads, liver and alimentary tract. Parasites were, using morphological and molecular techniques, identified as two representatives of Crassiphialinae, specifically part of the Posthodiplostomum-Ornithodiplostomum clade. The spatial, seasonal, and age class variation in parasite prevalence was examined...
September 13, 2017: Parasitology Research
https://www.readbyqxmd.com/read/28904727/post-ivermectin-encephalopathy-in-senegal-a-case-report
#13
Daniel Gams Massi, Mohamed Lelouma Mansare, Mariétou Traoré, Moustapha Ndiaye, Amadou Gallo Diop, Mouhamadou Mansour Ndiaye
Ivermectin is an ant parasitic drug used for combating onchocerciasis and lymphatic filariasis. It works by inhibiting the function of neurons and muscles, thus causing paralysis of microfilariae. Side effects of this drug have been reported including post-ivermectin encephalopathy requiring emergency care in hospital. We report the case of a 35 years old patient living in rural areas of Senegal who presented two days after a mistake in administration of a second dose of ivermectin, headaches, altered consciousness and bilateral blindness...
2017: Pan African Medical Journal
https://www.readbyqxmd.com/read/28902908/histological-assessment-of-granulomas-in-natural-and-experimental-schistosoma-mansoni-infections-using-whole-slide-imaging
#14
Kátia B Amaral, Thiago P Silva, Felipe F Dias, Kássia K Malta, Florence M Rosa, Sócrates F Costa-Neto, Rosana Gentile, Rossana C N Melo
The pathology of schistosomiasis mansoni, a neglected tropical disease of great clinical and socioeconomic importance, results from the parasite eggs that become trapped in host tissues, particularly in the liver and intestines. Continuous antigenic stimulation from these eggs leads to recruitment of inflammatory cells to the sites of infection with formation of periovular granulomas. These complex structures have variable size and composition and are the most striking histopathological feature of schistosomiasis mansoni...
2017: PloS One
https://www.readbyqxmd.com/read/28900150/high-throughput-data-analyses-of-the-immune-characteristics-of-microtus-fortis-infected-with-schistosoma-japonicum
#15
Yuan Hu, Lei Sun, Zhongying Yuan, Yuxin Xu, Jianping Cao
Microtus fortis exhibits natural resistance against Schistosoma japonicum, and the parasite cannot grow and develop in M. fortis. Extensive research has been carried out, however, the associated mechanism remains unclear. In the present study, we analysed the combined data obtained from a cytokine chip assay, transcriptome, and metabolome. The cytokine profile from C57BL/6 and M. fortis mice was assessed before and after infection. Several cytokines increased during the second and third week post-infection...
September 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28899382/carrion-crows-corvus-corone-of-southwest-germany-important-hosts-for-haemosporidian-parasites
#16
Sandrine Schmid, Katrin Fachet, Anke Dinkel, Ute Mackenstedt, Friederike Woog
BACKGROUND: Avian malaria parasites (Plasmodium spp.) and other Haemosporida (Haemoproteus and Leucocytozoon spp.) form a diverse group of vector-transmitted blood parasites that are abundant in many bird families. Recent studies have suggested that corvids may be an important host for Plasmodium spp. and Leucocytozoon spp. METHODS: To investigate the diversity of Haemosporida of resident carrion crows (Corvus corone) and Eurasian Magpies (Pica pica) in southwest Germany, 100 liver samples of corvids were examined using a nested PCR method to amplify a 1063 bp fragment of the haemosporidian mitochondrial cytochrome b gene...
September 12, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28894272/t-cell-tolerance-and-exhaustion-in-the-clearance-of-echinococcus-multilocularis-role-of-inoculum-size-in-a-quantitative-hepatic-experimental-model
#17
Chuanshan Zhang, Yingmei Shao, Shuting Yang, Xiaojuan Bi, Liang Li, Hui Wang, Ning Yang, Zhide Li, Cheng Sun, Liang Li, Guodong Lü, Tuerganaili Aji, Dominique A Vuitton, Renyong Lin, Hao Wen
The local immune mechanisms responsible for either self-healing or sustained chronic infection are not clear, in the development of E. multilocularis larvae. Here, we developed a suitable experimental model that mimics naturally infected livers, according to the parasite load. We demonstrated that local cellular immunity and fibrogenesis are actually protective and fully able to limit metacestode growth in the liver of low or medium dose-infected mice (LDG or MDG), or even to clear it, while impairment of cellular immunity is followed by a more rapid and severe course of the disease in high dose-infected mice (HDG)...
September 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28893673/extracorporeal-membrane-oxygenation-ecmo-as-salvage-treatment-for-pulmonary-echinococcus-granulosus-infection-with-acute-cyst-rupture
#18
Sören L Becker, Sebastian Fähndrich, Franziska C Trudzinski, Barbara Gärtner, Frank Langer, Torben K Becker, Robert Bals, Philipp M Lepper, Christian Lensch
Extracorporeal membrane oxygenation (ECMO) has been successfully used for the treatment of patients with respiratory failure due to severe infections. Though rare, parasites can also cause severe pulmonary disease. Tapeworms of the genus Echinococcus give rise to the development of cystic structures in the liver, lungs and other organs. Acute cyst rupture leads to potentially life-threatening infection, and affected patients may deteriorate rapidly. We describe the case of a young woman from Bulgaria who was admitted to hospital with severe dyspnoea, progressive chest pain and haemoptysis...
September 8, 2017: International Journal of Infectious Diseases: IJID
https://www.readbyqxmd.com/read/28886097/population-genetics-community-of-parasites-and-resistance-to-rodenticides-in-an-urban-brown-rat-rattus-norvegicus-population
#19
Amélie Desvars-Larrive, Michel Pascal, Patrick Gasqui, Jean-François Cosson, Etienne Benoît, Virginie Lattard, Laurent Crespin, Olivier Lorvelec, Benoît Pisanu, Alexandre Teynié, Muriel Vayssier-Taussat, Sarah Bonnet, Philippe Marianneau, Sandra Lacôte, Pascale Bourhy, Philippe Berny, Nicole Pavio, Sophie Le Poder, Emmanuelle Gilot-Fromont, Elsa Jourdain, Abdessalem Hammed, Isabelle Fourel, Farid Chikh, Gwenaël Vourc'h
Brown rats are one of the most widespread urban species worldwide. Despite the nuisances they induce and their potential role as a zoonotic reservoir, knowledge on urban rat populations remains scarce. The main purpose of this study was to characterize an urban brown rat population from Chanteraines park (Hauts-de-Seine, France), with regards to haematology, population genetics, immunogenic diversity, resistance to anticoagulant rodenticides, and community of parasites. Haematological parameters were measured...
2017: PloS One
https://www.readbyqxmd.com/read/28883977/management-of-plasmodium-vivax-risk-and-illness-in-travelers
#20
EDITORIAL
J Kevin Baird
Malaria poses an exceptionally complex problem for providers of travel medicine services. Perceived high risk of exposure during travel typically prompts prescribing protective antimalarial drugs. Suppressive chemoprophylactic agents have dominated strategy for that practice for over 70 years. This broad class of therapeutic agents kills parasites after they emerge from the liver and attempt development in red blood cells. The dominance of suppressive chemoprophylaxis in travel medicine stems largely from the view of Plasmodium falciparum as the utmost threat to the patient - these drugs are poorly suited to preventing Plasmodium vivax and Plasmodium ovale due to inactivity against the latent liver stages of these species not produced by P...
2017: Tropical Diseases, Travel Medicine and Vaccines
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