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Schistosoma mansoni

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https://www.readbyqxmd.com/read/28646926/high-burden-of-schistosoma-mansoni-infection-in-school-aged-children-in-marolambo-district-madagascar
#1
Stephen A Spencer, James M St John Penney, Hannah J Russell, Anthony P Howe, Cortland Linder, Andriamahitsisambatra L D Rakotomampianina, Anjara M Nandimbiniaina, S Bertel Squire, J Russell Stothard, Amaya L Bustinduy, Alain M Rahetilahy
BACKGROUND: A school-based survey was undertaken to assess prevalence and infection intensity of schistosomiasis in school-aged children in the Marolambo District of Madagascar. METHODS: School-aged children from six purposively selected schools were tested for Schistosoma haematobium by urine filtration and Schistosoma mansoni using circulating cathodic antigen (CCA) and Kato-Katz stool analysis. The investigators did not address soil-transmitted helminths (STH) in this study...
June 24, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28639720/isophthalic-acid-based-hdac-inhibitors-as-potent-inhibitors-of-hdac8-from-schistosoma-mansoni
#2
Katharina Stenzel, Alokta Chakrabarti, Jelena Melesina, Finn K Hansen, Julien Lancelot, Simon Herkenhöhner, Beate Lungerich, Martin Marek, Christophe Romier, Raymond J Pierce, Wolfgang Sippl, Manfred Jung, Thomas Kurz
Schistosoma mansoni histone deacetylase 8 (SmHDAC8) has been recently identified as a new potential target for the treatment of schistosomiasis. A series of newly designed and synthesized alkoxyamide-based and hydrazide-based HDAC inhibitors were tested for inhibitory activity against SmHDAC8 and human HDACs 1, 6, and 8. The front runner compounds showed submicromolar activity against SmHDAC8 and modest preference for SmHDAC8 over its human orthologue hHDAC8. Docking studies provided insights into the putative binding mode in SmHDAC8 and allowed rationalization of the observed selectivity profile...
June 22, 2017: Archiv der Pharmazie
https://www.readbyqxmd.com/read/28637488/a-high-throughput-colorimetric-assay-for-detection-of-schistosoma-mansoni-viability-based-on-the-tetrazolium-salt-xtt
#3
Pedro Henrique Nascimento Aguiar, Núbia Monteiro Gonçalves Soares Fernandes, Carlos Leomar Zani, Marina Moraes Mourão
BACKGROUND: Schistosoma mansoni is a trematode parasite that causes schistosomiasis, one of the most prevalent neglected tropical diseases, leading to the loss of 2.6 million disability-adjusted life years. Praziquantel is the only drug available, and new drugs are required. The most common strategy in schistosomiasis drug discovery is the use of the schistosomula larval-stage for a pre-screen in drug sensitivity assays. However, assessing schistosomula viability by microscopy has always been a limitation to the throughput of such assays...
June 21, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28633651/epidemiology-of-intestinal-helminthiasis-among-school-children-with-emphasis-on-schistosoma-mansoni-infection-in-wolaita-zone-southern-ethiopia
#4
Bereket Alemayehu, Zewdneh Tomass, Fiseha Wadilo, Dawit Leja, Song Liang, Berhanu Erko
BACKGROUND: Intestinal helminth infections are major parasitic diseases causing public health problems in Ethiopia. Although the epidemiology of these infections are well documented in Ethiopia, new transmission foci for schistosomiasis are being reported in different parts of the country. The objective of this study was to assess the prevalence of Schistosoma mansoni and other intestinal helminth infections among school children and determine the endemicity of schistosomiasis in Wolaita Zone, southern Ethiopia...
June 20, 2017: BMC Public Health
https://www.readbyqxmd.com/read/28623957/developing-a-mathematical-model-for-the-evaluation-of-the-potential-impact-of-a-partially-efficacious-vaccine-on-the-transmission-dynamics-of-schistosoma-mansoni-in-human-communities
#5
Andria Stylianou, Christoforos Hadjichrysanthou, James E Truscott, Roy M Anderson
BACKGROUND: There is currently no vaccine available to protect humans against infection with the schistosome digenean parasites, although candidate formulations for Schistosoma mansoni are under trial in animal models, including rodents and primates. Current strategies for the control of infection are based on mass drug administration (MDA) targeted at school-aged children of age 5 to 14 years. This approach is unlikely to eliminate exposure to infection except in settings with very low levels of transmission...
June 17, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28622767/praziquantel-decreases-fecundity-in-schistosoma-mansoni-adult-worms-that-survive-treatment-evidence-from-a-laboratory-life-history-trade-offs-selection-study
#6
Poppy H L Lamberton, Christina L Faust, Joanne P Webster
BACKGROUND: Mass drug administration of praziquantel is the World Health Organization's endorsed control strategy for schistosomiasis. A decade of annual treatments across sub-Saharan Africa has resulted in significant reductions of infection prevalence and intensity levels, although 'hotspots' remain. Repeated drug treatments place strong selective pressures on parasites, which may affect life-history traits that impact transmission dynamics. Understanding drug treatment responses and the evolution of such traits can help inform on how to minimise the risk of drug resistance developing, maximise sustainable control programme success, and improve diagnostic protocols...
June 16, 2017: Infectious Diseases of Poverty
https://www.readbyqxmd.com/read/28622369/comparative-sequence-analysis-reveals-regulation-of-genes-in-developing-schistosomula-of-schistosoma-mansoni-exposed-to-host-portal-serum
#7
Wander de Jesus Jeremias, Flávio Marcos Gomes Araújo, Fábio Ribeiro Queiroz, Fabiano Sviatopolk Mirsky Pais, Ana Carolina Alves de Mattos, Anna Christina de Matos Salim, Paulo Marcos Zech Coelho, Guilherme Correa Oliveira, John Robert Kusel, Renata Guerra-Sá, Roney Santos Coimbra, Élio Hideo Babá
Once inside a vertebrate host after infection, individual schistosomula of the parasite Schistosoma mansoni find a new and complex environment, which requires quick adjustments for survival, such as those that allow it to avoid the innate immune response of the host. Thus, it is very important for the parasite to remain within the skin after entering the host for a period of about 3 days, at which time it can then reach the venous system, migrate to the lungs and, by the end of eighth day post-infection, it reach the portal venous system, while undergoing minimal changes in morphology...
2017: PloS One
https://www.readbyqxmd.com/read/28619227/efficacy-and-safety-of-praziquantel-in-preschool-aged-and-school-aged-children-infected-with-schistosoma-mansoni-a-randomised-controlled-parallel-group-dose-ranging-phase-2-trial
#8
Jean T Coulibaly, Gordana Panic, Kigbafori D Silué, Jana Kovač, Jan Hattendorf, Jennifer Keiser
BACKGROUND: Praziquantel has been the drug of choice for schistosomiasis control for more than 40 years, yet surprisingly, the optimal dose for children younger than 4 years is not known. We aimed to assess the efficacy and safety of escalating praziquantel dosages in preschool-aged children (PSAC). METHODS: We did a randomised controlled, parallel-group, single-blind, dose-ranging, phase 2 trial in PSAC (2-5 years) and school-aged children (SAC; aged 6-15 years) as a comparator group in southern Côte d'Ivoire...
July 2017: Lancet Global Health
https://www.readbyqxmd.com/read/28606164/the-importance-of-patient-compliance-in-repeated-rounds-of-mass-drug-administration-mda-for-the-elimination-of-intestinal-helminth-transmission
#9
Sam H Farrell, James E Truscott, Roy M Anderson
BACKGROUND: Systematic non-compliance to chemotherapeutic treatment among a portion of the eligible population is thought to be a major obstacle to the elimination of helminth infections by mass drug administration (MDA). MDA for helminths is repeated at defined intervals such as yearly or every 2 years, as a consequence of the inability of the human host to develop fully protective immunity to reinfection. As such, how an individual complies to these repeated rounds of MDA can have a significant impact on parasite transmission...
June 12, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28598427/different-populations-of-cd11b-dendritic-cells-drive-th2-responses-in-the-small-intestine-and-colon
#10
Johannes U Mayer, Mimoza Demiri, William W Agace, Andrew S MacDonald, Marcus Svensson-Frej, Simon W Milling
T-helper 2 (Th2) cell responses defend against parasites. Although dendritic cells (DCs) are vital for the induction of T-cell responses, the DC subpopulations that induce Th2 cells in the intestine are unidentified. Here we show that intestinal Th2 responses against Trichuris muris worms and Schistosoma mansoni eggs do not develop in mice with IRF-4-deficient DCs (IRF-4(f/f) CD11c-cre). Adoptive transfer of conventional DCs, in particular CD11b-expressing DCs from the intestine, is sufficient to prime S. mansoni-specific Th2 responses...
June 9, 2017: Nature Communications
https://www.readbyqxmd.com/read/28591406/the-use-of-circulating-cathodic-antigen-rapid-test-and-serology-for-diagnosis-of-active-schistosoma-mansoni-infection-in-migrants-in-italy-a-non-endemic-country-a-cross-sectional-study
#11
Laura Infurnari, Laura Galli, Alba Bigoloni, Alessia Carbone, Stefania Chiappetta, Angelo Sala, Norberto Ceserani, Adriano Lazzarin, Antonella Castagna, Giovanni Gaiera/
Diagnosis of schistosomiasis in migrants coming from endemic areas can be difficult, especially in asymptomatic subjects. Light-intensity disease, in fact, may be missed due to the low sensitivity of the stool microscopy and serologic testing cannot distinguish between a resolved infection and an active infection in patients who have been infected and treated in the past, because specific antibodies can persist despite cure. We describe a cross-sectional study conducted on 82 migrants tested for Schistosoma mansoni on single blood (anti-schistosome antibodies, total IgE) and urine [point-of-care (POC) circulating-cathodic-antigen (CCA) test] samples...
June 2017: Memórias do Instituto Oswaldo Cruz
https://www.readbyqxmd.com/read/28584726/the-south-american-distribution-and-southernmost-record-of-biomphalaria-peregrina-a-potential-intermediate-host-of-schistosomiasis
#12
Alejandra Rumi, Roberto Eugenio Vogler, Ariel Aníbal Beltramino
Schistosomiasis remains a major parasitic disease, endemic in large parts of South America. Five neotropical species of Biomphalaria have been found to act as intermediate hosts of Schistosoma mansoni in natural populations, while others have been shown to be susceptible in experimental infections, although not found infected in the field. Among these potential intermediate hosts, Biomphalaria peregrina represents the most widespread species in South America, with confirmed occurrence records from Venezuela to northern Patagonia...
2017: PeerJ
https://www.readbyqxmd.com/read/28583151/identification-and-validation-of-a-schistosoma-japonicum-u6-promoter
#13
Qing Li, Wan Wang, Nan Zhao, Pengcheng Li, Yue Xin, Wei Hu
BACKGROUND: RNA polymerase III promoters have been widely used to express short hairpin-RNA (shRNA), microRNA (miRNA), and small guide RNA (sgRNA) in gene functional analysis in a variety of organisms including Schistosoma mansoni. However, no endogenous RNA polymerase III promoters have been identified in Schistosoma japonicum. The lack of appropriate promoters in S. japonicum has hindered its gene functional analysis. Identification of functional promoters in S. japonicum is therefore in urgent need...
June 5, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28581371/delayed-presentation-of-cerebral-schistosomiasis-presenting-as-a-tumor-like-brain-lesion
#14
Suradech Suthiphosuwan, Amy Lin, Andrew F Gao, David G Munoz, Julian Spears, Aditya Bharatha
Schistosomiasis is the second most common parasitic infection worldwide. North America is a nonendemic area. However, there are occasional case reports among travelers and immigrants from endemic regions. We describe a case of a 55-year-old Canadian woman who presented with first episode of seizure. Her magnetic resonance imaging scan revealed a mass-like lesion involving the left anterior temporal lobe. The lesion showed T1 hypo- and T2 hyperintense with perilesional brain edema. On post-gadolinium-enhanced T1-weighted sequence, the lesion showed multiple small nodular and linear enhancements, also called an "arborized" appearance...
January 1, 2017: Neuroradiology Journal
https://www.readbyqxmd.com/read/28578678/changes-in-the-neuropeptide-content-of-biomphalaria-ganglia-nervous-system-following-schistosoma-infection
#15
Tianfang Wang, Min Zhao, Di Liang, Utpal Bose, Satwant Kaur, Donald P McManus, Scott F Cummins
BACKGROUND: Molluscs, including snails, are prone to parasite infection, which can lead to massive physiological and behavioural changes, yet many of the molecular components involved remain unresolved. Central to this point is the neural system that in snails consists of several ganglia that regulate the animals' physiology and behaviour patterns. The availability of a genomic resource for the freshwater snail Biomphalaria glabrata provides a mean towards the high throughput analysis of changes in the central nervous system (CNS) following infection with Schistosoma miracidia...
June 2, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28562805/high-prevalence-of-enteroparasites-in-children-from-ribeir%C3%A3-o-preto-s%C3%A3-o-paulo-brazil
#16
Renata Elizabete Pagotti da Fonseca, Michelle Christiane Rodrigues Barbosa, Beatriz Rossetti Ferreira
Objective: To determine the prevalence of intestinal parasites and possible associated factors. Method: Cross-sectional epidemiological study of 962 children (3-12-years) from an area within the scope of a basic health unit in Ribeirão Preto, São Paulo, Brazil. Data were collected by home interviews and three-sample stool analysis and evaluated with the chi-square and Fisher's exact tests (p<0.05). Results: The prevalence of intestinal parasites was significantly high (57...
May 2017: Revista Brasileira de Enfermagem
https://www.readbyqxmd.com/read/28555471/comparison-of-the-spatial-patterns-of-schistosomiasis-in-zimbabwe-at-two-points-in-time-spaced-twenty-nine-years-apart-is-climate-variability-of-importance
#17
Ulrik B Pedersen, Dimitrios-Alexios Karagiannis-Voules, Nicholas Midzi, Tkafira Mduluza, Samson Mukaratirwa, Rasmus Fensholt, Birgitte J Vennervald, Thomas K Kristensen, Penelope Vounatsou, Anna-Sofie Stensgaard
Temperature, precipitation and humidity are known to be important factors for the development of schistosome parasites as well as their intermediate snail hosts. Climate therefore plays an important role in determining the geographical distribution of schistosomiasis and it is expected that climate change will alter distribution and transmission patterns. Reliable predictions of distribution changes and likely transmission scenarios are key to efficient schistosomiasis intervention-planning. However, it is often difficult to assess the direction and magnitude of the impact on schistosomiasis induced by climate change, as well as the temporal transferability and predictive accuracy of the models, as prevalence data is often only available from one point in time...
May 8, 2017: Geospatial Health
https://www.readbyqxmd.com/read/28555470/spatio-temporal-dynamics-of-schistosomiasis-in-rwanda-between-2001-and-2012-impact-of-the-national-neglected-tropical-disease-control-programme
#18
Elias Nyandwi, Tom Veldkamp, Frank Badu Osei, Sherif Amer
Schistosomiasis is recognised as a major public health problem in Rwanda. We aimed to identify the spatio-temporal dynamics of its distribution at a fine-scale spatial resolution and to explore the impact of control programme interventions. Incidence data of Schistosoma mansoni infection at 367 health facilities were obtained for the period 2001-2012. Disease cluster analyses were conducted using spatial scan statistics and geographic information systems. The impact of control interventions was assessed for three distinct sub-periods...
May 8, 2017: Geospatial Health
https://www.readbyqxmd.com/read/28552793/artichoke-leaf-extract-protects-liver-of-schistosoma-mansoni-infected-mice-through-modulation-of-hepatic-stellate-cells-recruitment
#19
Shaimaa Ahmed Sharaf El-Deen, Reham Mustafa Brakat, Asmaa Shams El Dein Mohamed
Schistosomiasis is the second most common human parasitic disease worldwide. It is responsible for 300000 deaths per year. Liver fibrosis is the main pathology of schistosomiasis and its complications are the major cause of death in infected cases. Unfortunately, the therapeutic dose of praziquantel (PZQ) - the main drug treatment - doesn't markedly affect fibrosis. In the present study, antiparasitic and hepatoprotective properties of artichoke leaf extract (ALE) were tested on mice experimentally infected with Schistosoma mansoni (S...
July 2017: Experimental Parasitology
https://www.readbyqxmd.com/read/28542189/mir-277-4989-regulate-transcriptional-landscape-during-juvenile-to-adult-transition-in-the-parasitic-helminth-schistosoma-mansoni
#20
Anna V Protasio, Stijn van Dongen, Julie Collins, Leonor Quintais, Diogo M Ribeiro, Florian Sessler, Martin Hunt, Gabriel Rinaldi, James J Collins, Anton J Enright, Matthew Berriman
Schistosomes are parasitic helminths that cause schistosomiasis, a disease affecting circa 200 million people, primarily in underprivileged regions of the world. Schistosoma mansoni is the most experimentally tractable schistosome species due to its ease of propagation in the laboratory and the high quality of its genome assembly and annotation. Although there is growing interest in microRNAs (miRNAs) in trematodes, little is known about the role these molecules play in the context of developmental processes...
May 2017: PLoS Neglected Tropical Diseases
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