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Schistosoma mansoni

Qiang Wang, Akram A Da'dara, Patrick J Skelly
BACKGROUND: Schistosomes are blood dwelling parasitic worms that cause the debilitating disease schistosomiasis. Here we examined the influence of the parasites on their external environment by monitoring the impact of adult Schistosoma mansoni worms on the murine plasma proteome in vitro and, in particular, on how the worms affect the blood coagulation protein high molecular weight kininogen (HK). METHODS: Following the incubation of adult schistosomes in murine plasma, two-dimensional differential in-gel electrophoresis (2D-DIGE) was conducted to look for changes in the plasma proteome compared with control plasma...
March 14, 2018: Parasites & Vectors
Alvine C Kengne-Fokam, Hugues C Nana-Djeunga, Mohamed Bagayan, Flobert Njiokou
BACKGROUND: Intestinal schistosomiasis due to Schistosoma mansoni was mapped in Cameroon in the 1990s and preventive chemotherapy launched since 2005. A situation analysis conducted in 2011 revealed an increase in schistosomiasis transmission, especially in the equatorial part of the country, despite the fact that Biomphalaria pfeifferi, the main intermediate host of this parasite, is now scarce in many foci. Biomphalaria camerunensis, restricted to the equatorial part of the country, is considered as a less suitable host for S...
March 13, 2018: Parasites & Vectors
Javier Gandasegui, Pedro Fernández-Soto, Antonio Muro, Constança Simões Barbosa, Fabio Lopes de Melo, Rodrigo Loyo, Elainne Christine de Souza Gomes
BACKGROUND: In Brazil, schistosomiasis is a parasitic disease of public health relevance, mainly in poor areas where Schistosoma mansoni is the only human species encountered and Biomphalaria straminea is one of the intermediate host snails. A nested-PCR based on a specific mitochondrial S. mansoni minisatellite DNA region has been successfully developed and applied as a reference method in Brazil for S. mansoni detection, mainly in host snails for epidemiological studies. The amplification efficiency of LAMP is known to be higher than PCR...
March 2018: PLoS Neglected Tropical Diseases
Bernard O Abudho, Eric M Ndombi, Bernard Guya, Jennifer M Carter, Diana K Riner, Nupur Kittur, Diana M S Karanja, W Evan Secor, Daniel G Colley
Schistosomiasis remains a major public health problem in Kenya. The World Health Organization recommends preventive chemotherapy with praziquantel (PZQ) to control morbidity due to schistosomiasis. Morbidity is considered linked to intensity of infection, which along with prevalence is used to determine the frequency of mass drug administration (MDA) to school-age children. We determined the impact of annual school-based MDA on children across all primary and high school years using a repeated cross-sectional study design in five schools near Lake Victoria in western Kenya, an area endemic for Schistosoma mansoni ...
March 12, 2018: American Journal of Tropical Medicine and Hygiene
Pierre H H Schneeberger, Jean T Coulibaly, Gordana Panic, Claudia Daubenberger, Morgan Gueuning, Jürg E Frey, Jennifer Keiser
BACKGROUND: Schistosomiasis is a neglected tropical disease burdening millions of people. One drug, praziquantel, is currently used for treatment and control. Clinically relevant drug resistance has not yet been described, but there is considerable heterogeneity in treatment outcomes, ranging from cure to only moderate egg reduction rates. The objectives of this study are to investigate potential worm-induced dysbacteriosis of the gut microbiota and to assess whether a specific microbiome profile could influence praziquantel response...
March 12, 2018: Parasites & Vectors
Fernando Schemelzer Moraes Bezerra, Joames Kauffimann Freitas Leal, Mariana Silva Sousa, Marta Cristhiany Cunha Pinheiro, Alberto Novaes Ramos, Vanessa Silva-Moraes, Naftale Katz
Schistosomiasis is still a public health problem in Brazil. The Kato-Katz test is the most frequently used diagnostic method for Schistosoma mansoni infection. However, it lacks sensitivity in areas of low prevalence. We have assessed the positivity rate of S. mansoni infection in Bananeiras, a village on Capistrano, Ceara, Brazil by performing a point-of-care test in urine to determine the circulating cathodic antigens (POC-CCA), and we compared the findings with those of the Kato-Katz technique for egg detection in stool and an enzyme-linked immunosorbent assay for specific antibodies against adult worms (SWAP-ELISA) in serum before treatment (baseline)...
March 8, 2018: Acta Tropica
Rafaella F Q Grenfell, Diana Taboada, Lucélia A Coutinho, Maria Luysa C Pedrosa, Jéssica V Assis, Matheus S P Oliveira, Renata R Cruz, Aureo Almeida, Vanessa Silva-Moraes, Naftale Katz, Paulo Marcos Z Coelho
Background: Prior to eliminating schistosomiasis, efforts must address accurate and fast individual diagnosis. Diagnosis is still inaccurate by parasitological and point-of-care circulating cathodic antigen (POC-CCA) in areas of low endemicity. Methods: Our group has optimized POC-CCA with a 30 min urine concentration step with no need for specialized technicians or equipment and with high accuracy. We evaluated this new method, called POC-CCA filter (FLT), in two Brazilian endemic areas with distinct profiles...
March 7, 2018: Transactions of the Royal Society of Tropical Medicine and Hygiene
Edward T Morgan, Joseph L Dempsey, Sylvie M Mimche, Tracey J Lamb, Supriya Kulkarni, Julia Yue Cui, Hyunyoung Jeong, Angela L Slitt
This article is a report on a symposium entitled "Physiological Regulation of Drug Metabolism and Transport" sponsored by the American Society for Pharmacology and Experimental Therapeutics and held at the Experimental Biology 2017 meeting in Chicago, IL. The contributions of physiological and pathophysiological regulation of drug metabolizing enzymes and transporters to interindividual variability in drug metabolism are increasingly recognized, but are in many cases not well understood. The presentations herein discuss the phenomenology, consequences and mechanism of such regulation...
March 7, 2018: Drug Metabolism and Disposition: the Biological Fate of Chemicals
Lucie Jedličková, Hana Dvořáková, Jan Dvořák, Martin Kašný, Lenka Ulrychová, Jiří Vorel, Vojtěch Žárský, Libor Mikeš
BACKGROUND: Cysteine peptidases of clan CA, family C1 account for a major part of proteolytic activity in the haematophagous monogenean Eudiplozoon nipponicum. The full spectrum of cysteine cathepsins is, however, unknown and their particular biochemical properties, tissue localisation, and involvement in parasite-host relationships are yet to be explored. METHODS: Sequences of cathepsins L and B (EnCL and EnCB) were mined from E. nipponicum transcriptome and analysed bioinformatically...
March 6, 2018: Parasites & Vectors
Joseph E Igetei, Marwa El-Faham, Susan Liddell, Gabriele Schramm, Michael J Doenhoff
Previous studies have shown that schistosome infection can protect against allergic symptoms, but the underlying mechanisms are still not fully understood. Here we have shown that rabbit IgG antibodies raised against Schistosoma mansoni soluble egg antigens (SmSEA) are cross-reactive with a wide array of molecules in Timothy grass pollen (TGP) and birch tree pollen (BTP). Five of the cross-reactive pollen molecules (two from TGP and three from BTP) were selected randomly and identified by tandem mass spectrometric (TMS) analysis to be, respectively, the TGP allergens Phl p 1 and Phl p 5b, and BTP glutathione S-transferase (GST), and the BTP allergens Bet v 1 and Bet v 6...
March 3, 2018: International Journal for Parasitology
Shimeles Adugna, Tadesse Kebede, Zeleke Mekonnen, Abraham Degarege, Song Liang, Berhanu Erko
Background: In this cross-sectional study, we compared the performance of Mini Parasep® solvent-free (SF) faecal parasite concentrator, Kato-Katz thick smear and McMaster techniques for the diagnosis of intestinal parasitic infections among children in Wosha Soyama Primary School, Ethiopia. Methods: Stool samples were collected from 381 children and examined for intestinal parasitic infections using Mini Parasep® SF faecal parasite concentrator, Kato-Katz thick smear and McMaster techniques...
March 2, 2018: Transactions of the Royal Society of Tropical Medicine and Hygiene
Dora Buonfrate, Paola Rodari, Daniele Brunelli, Monica Degani, Andrea Ragusa, Stefano Tais, Martina Todeschini, Zeno Bisoffi
BACKGROUND: An immunochromatographic rapid test (ICT; Schistosoma ICT IgG-IgM, LDBIO Diagnostics) demonstrated high sensitivity (96%) in the diagnosis of Schistosoma mansoni and S. haematobium . To date, the test has been validated for use on serum only, but in the absence of lab equipment, blood drop from fingerprick could be a useful option. This method is acquiring more interest because of the high flow of migrants rapidly moving across Italy and other European countries. OBJECTIVE: The aim of this prospective study was to evaluate the use of ICT on whole blood obtained from fingerprick...
March 3, 2018: BMJ Open
Conrad V Simoben, Dina Robaa, Alokta Chakrabarti, Karin Schmidtkunz, Martin Marek, Julien Lancelot, Srinivasaraghavan Kannan, Jelena Melesina, Tajith B Shaik, Raymond J Pierce, Christophe Romier, Manfred Jung, Wolfgang Sippl
A promising means in the search of new small molecules for the treatment of schistosomiasis (amongst other parasitic ailments) is by targeting the parasitic epigenome. In the present study, a docking based virtual screening procedure using the crystal structure of histone deacetylase 8 from Schistosoma mansoni (smHDAC8) was designed. From the developed screening protocol, we were able to identify eight novel N -(2,5-dioxopyrrolidin-3-yl)- n -alkylhydroxamate derivatives as smHDAC8 inhibitors with IC50 values ranging from 4...
March 2, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Mariana Boroni, Michael Sammeth, Sandra Grossi Gava, Natasha Andressa Nogueira Jorge, Andréa Mara Macedo, Carlos Renato Machado, Marina Moraes Mourão, Glória Regina Franco
Spliced leader dependent trans-splicing (SLTS) has been described as an important RNA regulatory process that occurs in different organisms, including the trematode Schistosoma mansoni. We identified more than seven thousand putative SLTS sites in the parasite, comprising genes with a wide spectrum of functional classes, which underlines the SLTS as a ubiquitous mechanism in the parasite. Also, SLTS gene expression levels span several orders of magnitude, showing that SLTS frequency is not determined by the expression level of the target gene, but by the presence of particular gene features facilitating or hindering the trans-splicing mechanism...
March 1, 2018: Scientific Reports
Beuy Joob, Viroj Wiwanitkit
No abstract text is available yet for this article.
December 2017: Revista da Associação Médica Brasileira
Eveline Hürlimann, Kigbafori D Silué, Fabien Zouzou, Mamadou Ouattara, Thomas Schmidlin, Richard B Yapi, Clarisse A Houngbedji, Kouassi Dongo, Bernadette A Kouadio, Siaka Koné, Bassirou Bonfoh, Eliézer K N'Goran, Jürg Utzinger, Cinthia A Acka-Douabélé, Giovanna Raso
BACKGROUND: Preventive chemotherapy with donated anthelminthic drugs is the cornerstone for the control of helminthiases. However, reinfection can occur rapidly in the absence of clean water and sanitation coupled with unhygienic behaviour. The purpose of this study was to assess the effect of an integrated package of interventions, consisting of preventive chemotherapy, community-led total sanitation (CLTS) and health education, on the prevalence of helminth and intestinal protozoa infections and on participants' knowledge, attitude, practice and beliefs (KAPB) towards these diseases including water, sanitation and hygiene (WASH)...
February 27, 2018: Parasites & Vectors
O Rubaba, M J Chimbari, W Soko, T Manyangadze, S Mukaratirwa
Circulating cathodic antigen (CCA) tests for schistosomiasis are fast and less complicated allowing making them good candidates for routine qualitative screening for schistosomiasis at point of care. The urine-CCA has been evaluated for detection of S. mansoni with promising results. Its specificity and consistency in detecting S. haematobium infection in different endemic regions has been variable. This study validated a rapid urine-CCA cassette test for qualitative detection of S. haematobium infection in an S...
February 24, 2018: Acta Tropica
Rafaela S Fernandes, Luis G V Fernandes, Andre S de Godoy, Patrícia A Miyasato, Eliana Nakano, Leonardo P Farias, Ana L T O Nascimento, Luciana C C Leite
Schistosomiasis is a neglected tropical disease caused by trematodes of the genus Schistosoma which have a complex life cycle characterized by an asexual multiplication in the snail intermediate host and a sexual reproduction phase in the mammalian definitive host. The initial steps of the human host infection involve the secretion of proteins contained in the acetabular glands of cercariae that promote parasite adhesion and proteolysis of the skin layers. Herein, we performed a functional analysis of SmVAL18, identified as one of the three SCP/TAPS proteins constituent of cercarial secretions...
February 22, 2018: Molecular and Biochemical Parasitology
Ana C Mafud, Marcos P N Silva, Geandra B L Nunes, Milene A R de Oliveira, Larissa F Batista, Thiago I Rubio, Ana C Mengarda, Eloi Lago, Rogério P Xavier, Stanley J C Gutierrez, Pedro L S Pinto, Ademar A da Silva Filho, Yvonne P Mascarenhas, Josué de Moraes
Schistosomiasis, caused by helminth flatworms of the genus Schistosoma, is one of the most important parasitic diseases in the world, affecting over 200 million people in developing countries. Riparins are natural alkamides found in Aniba riparia (Lauraceae) fruits that possess several pharmacological properties. In this study, we reported the synthesis, characterization and structural analysis of six riparin derivatives (A-F), as well as their schistosomicidal activity against S. mansoni worms together with a biological, pharmacokinetic and toxicological in silico evaluation...
February 21, 2018: Toxicology in Vitro: An International Journal Published in Association with BIBRA
Michelle N Clements, Paul L A M Corstjens, Sue Binder, Carl H Campbell, Claudia J de Dood, Alan Fenwick, Wendy Harrison, Donatien Kayugi, Charles H King, Dieuwke Kornelis, Onesime Ndayishimiye, Giuseppina Ortu, Mariama Sani Lamine, Antonio Zivieri, Daniel G Colley, Govert J van Dam
BACKGROUND: Kato-Katz examination of stool smears is the field-standard method for detecting Schistosoma mansoni infection. However, Kato-Katz misses many active infections, especially of light intensity. Point-of-care circulating cathodic antigen (CCA) is an alternative field diagnostic that is more sensitive than Kato-Katz when intensity is low, but interpretation of CCA-trace results is unclear. To evaluate trace results, we tested urine and stool specimens from 398 pupils from eight schools in Burundi using four approaches: two in Burundi and two in a laboratory in Leiden, the Netherlands...
February 23, 2018: Parasites & Vectors
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