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Schistosoma mansoni

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https://www.readbyqxmd.com/read/28212414/decline-in-infection-related-morbidities-following-drug-mediated-reductions-in-the-intensity-of-schistosoma-infection-a-systematic-review-and-meta-analysis
#1
Gisele Andrade, David J Bertsch, Andrea Gazzinelli, Charles H King
BACKGROUND: Since 1984, WHO has endorsed drug treatment to reduce Schistosoma infection and its consequent morbidity. Cross-sectional studies suggest pre-treatment correlation between infection intensity and risk for Schistosoma-related pathology. However, evidence also suggests that post-treatment reduction in intensity may not reverse morbidity because some morbidities occur at all levels of infection, and some reflect permanent tissue damage. The aim of this project was to systematically review evidence on drug-based control of schistosomiasis and to develop a quantitative estimate of the impact of post-treatment reductions in infection intensity on prevalence of infection-associated morbidity...
February 17, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28211535/arylmethylamino-steroids-as-antiparasitic-agents
#2
Reimar Krieg, Esther Jortzik, Alice-Anne Goetz, Stéphanie Blandin, Sergio Wittlin, Mourad Elhabiri, Mahsa Rahbari, Selbi Nuryyeva, Kerstin Voigt, Hans-Martin Dahse, Axel Brakhage, Svenja Beckmann, Thomas Quack, Christoph G Grevelding, Anthony B Pinkerton, Bruno Schönecker, Jeremy Burrows, Elisabeth Davioud-Charvet, Stefan Rahlfs, Katja Becker
In search of antiparasitic agents, we here identify arylmethylamino steroids as potent compounds and characterize more than 60 derivatives. The lead compound 1o is fast acting and highly active against intraerythrocytic stages of chloroquine-sensitive and resistant Plasmodium falciparum parasites (IC50 1-5 nM) as well as against gametocytes. In P. berghei-infected mice, oral administration of 1o drastically reduces parasitaemia and cures the animals. Furthermore, 1o efficiently blocks parasite transmission from mice to mosquitoes...
February 17, 2017: Nature Communications
https://www.readbyqxmd.com/read/28201853/antigenic-cross-reactivity-between-schistosoma-mansoni-and-peanut-a-role-for-cross-reactive-carbohydrate-determinants-ccds-and-implications-for-the-hygiene-hypothesis
#3
Joseph E Igetei, Marwa El-Faham, Susan Liddell, Michael J Doenhoff
The antigenic reactivity of constituents of Schistosoma mansoni and peanut (Arachis hypogaea) was investigated to determine whether identical antigenic epitopes possessed by both organisms provided a possible explanation for the negative correlation between chronic schistosome infection and atopy to allergens. Aqueous extracts of peanuts were probed in Western immunoblots with rabbit IgG antibodies raised against the egg, cercarial and adult worm stages of S. mansoni. Several molecules in the peanut extract were antigenically reactive with antibodies from the various rabbit anti-schistosome sera...
February 15, 2017: Immunology
https://www.readbyqxmd.com/read/28196636/impact-of-schistosomiasis-on-increase-incidence-of-occult-hepatitis-b-in-chronic-hepatitis-c-patients-in-egypt
#4
Hanan H Omar, Samaa A Taha, Wafaa H Hassan, Hamdy H Omar
Co-infection of schistosomiasis, HBV and HCV is common in countries where schistosomiasis is endemic. Occult hepatitis B occurs in patients at high risk for HBV infection (e.g., patients on hemodialysis, patients receiving blood transfusions). Schistosomal infection is a risk factor of HBV infection that can increase the incidence of occult hepatitis B. We aimed to determine the prevalence of occult hepatitis B in chronic hepatitis C patients with and without schistosomiasis and to assess the effect of schistosomal infection on the increased risk of exposure to HBV infection and to occult hepatitis B...
February 9, 2017: Journal of Infection and Public Health
https://www.readbyqxmd.com/read/28192534/sm-p80-based-schistosomiasis-vaccine-mediated-epistatic-interactions-identified-potential-immune-signatures-for-vaccine-efficacy-in-mice-and-baboons
#5
Juan U Rojo, Michael W Melkus, Kameswara Rao Kottapalli, Oscar E Okiya, Justin Sudduth, Weidong Zhang, Adebayo J Molehin, Darrick Carter, Afzal A Siddiqui
Schistosomiasis is a neglected parasitic disease of major public health concern as it affects over 250 million people in developing countries. Currently there is no licensed vaccine available against schistosomiasis. The Schistosoma mansoni calpain protein, Sm-p80, is a leading vaccine candidate now ready to move to clinical trials. In order to better assess Sm-p80 vaccine immunogenicity; here we used a systems biology approach employing RNA-sequencing to identify gene signatures and epistatic interactions following Sm-p80 vaccination in mouse and baboon models that may predict vaccine efficacy...
2017: PloS One
https://www.readbyqxmd.com/read/28192437/species-dependent-impact-of-helminth-derived-antigens-on-human-macrophages-infected-with-mycobacterium-tuberculosis-direct-effect-on-the-innate-anti-mycobacterial-response
#6
Naomi Aira, Anna-Maria Andersson, Susmita K Singh, Derek M McKay, Robert Blomgran
BACKGROUND: In countries with a high prevalence of tuberculosis there is high coincident of helminth infections that might worsen disease outcome. While Mycobacterium tuberculosis (Mtb) gives rise to a pro-inflammatory Th1 response, a Th2 response is typical of helminth infections. A strong Th2 response has been associated with decreased protection against tuberculosis. PRINCIPAL FINDINGS: We investigated the direct effect of helminth-derived antigens on human macrophages, hypothesizing that helminths would render macrophages less capable of controlling Mtb...
February 13, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28185084/-schistosomose-urog%C3%A3-nitale-et-cancer
#7
A Berry, X Iriart, J Fillaux, J-F Magnaval
The existence of a link between urinary schistosomiasis (US) and bladder carcinoma was first suspected by C. Goebel in 1905. In 1911, A.R Ferguson, who was a professor of Pathology and Microbiology at the Faculty of Medicine in Cairo, published a more detailed survey from 40 autopsies, and reported a likely association of bladder carcinoma with granulomas caused by US. Subsequently, published results from several studies reinforced Ferguson's hypothesis. Moreover, in most countries where US was endemic, association of high prevalence of bladder carcinoma with US had been pointed out...
February 10, 2017: Bulletin de la Société de Pathologie Exotique
https://www.readbyqxmd.com/read/28178325/prevalence-and-clinical-relevance-of-helminth-co-infections-among-tuberculosis-patients-in-urban-tanzania
#8
Francis Mhimbira, Jerry Hella, Khadija Said, Lujeko Kamwela, Mohamed Sasamalo, Thomas Maroa, Magreth Chiryamkubi, Grace Mhalu, Christian Schindler, Klaus Reither, Stefanie Knopp, Jürg Utzinger, Sébastien Gagneux, Lukas Fenner
BACKGROUND: Helminth infections can negatively affect the immunologic host control, which may increase the risk of progression from latent Mycobacterium tuberculosis infection to tuberculosis (TB) disease and alter the clinical presentation of TB. We assessed the prevalence and determined the clinical relevance of helminth co-infection among TB patients and household contact controls in urban Tanzania. METHODOLOGY: Between November 2013 and October 2015, we enrolled adult (≥18 years) sputum smear-positive TB patients and household contact controls without TB during an ongoing TB cohort study in Dar es Salaam, Tanzania...
February 8, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28178298/the-impact-of-prenatal-exposure-to-parasitic-infections-and-to-anthelminthic-treatment-on-antibody-responses-to-routine-immunisations-given-in-infancy-secondary-analysis-of-a-randomised-controlled-trial
#9
Stephen Nash, Alexander J Mentzer, Swaib A Lule, Dennison Kizito, Gaby Smits, Fiona R M van der Klis, Alison M Elliott
BACKGROUND: Chronic parasitic infections are associated with active immunomodulation which may include by-stander effects on unrelated antigens. It has been suggested that pre-natal exposure to parasitic infections in the mother impacts immunological development in the fetus and hence the offspring's response to vaccines, and that control of parasitic infection among pregnant women will therefore be beneficial. METHODOLOGY/PRINCIPAL FINDINGS: We used new data from the Entebbe Mother and Baby Study, a trial of anthelminthic treatment during pregnancy conducted in Uganda, to further investigate this hypothesis...
February 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28167600/schistosomiasis-and-human-immunodeficiency-virus-in-men-in-tanzania
#10
Jennifer A Downs, Claudia J de Dood, Hannah E Dee, Megan McGeehan, Hijab Khan, Abena Marenga, Patrick E Adel, Edward Faustine, Benson Issarow, Emmanuel F Kisanga, Godfrey Alfred Kisigo, Salvius Ngahyolerwa, Frank Zahoro, Donald Miyaye, Ruth Gideon Magawa, Julius Mngara, Myung Hee Lee, Paul L A M Corstjens, Govert J van Dam, Daniel W Fitzgerald
Schistosomiasis is a parasitic worm infection that affects over 260 million individuals worldwide. Women with schistosome infections have been demonstrated to have a 4-fold increase in the odds of human immunodeficiency virus (HIV) infection compared with women without schistosome infections. A relationship between schistosome and HIV infections has not been clearly defined in men. Among 674 men aged 18-50 years living in rural Tanzania, we identified 429 (63.6%) who had a schistosome infection as defined by serum positivity for schistosome circulating anodic antigen, visualization of parasite eggs in urine or stool, or both...
February 6, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28167208/resveratrol-ameliorates-oxidative-stress-and-organ-dysfunction-in-schistosoma-mansoni-infected-mice
#11
R H Soliman, O A Ismail, M S Badr, S M Nasr
Schistosoma mansoni causes a major chronic debilitating disease in more than 230 million people around the world. The pathognomonic granuloma is a major cause of the oxidative stress encountered as a consequence of infection not only in the liver, but also in other important organs as spleen, lung, brain and kidney. Resveratrol administration at a dose of 20 mg/kg once daily for two weeks to mice infected with Schistosoma mansoni resulted in improvement in serum cholesterol and triglyceride levels. Enzymatic antioxidant profile showed significant modulations in Superoxide dismutase, catalase activities and reduced glutathione levels...
February 4, 2017: Experimental Parasitology
https://www.readbyqxmd.com/read/28162096/intestinal-schistosomiasis-in-uganda-at-high-altitude-1400%C3%A2-m-malacological-and-epidemiological-surveys-on-mount-elgon-and-in-fort-portal-crater-lakes-reveal-extra-preventive-chemotherapy-needs
#12
Michelle C Stanton, Moses Adriko, Moses Arinaitwe, Alison Howell, Juliet Davies, Gillian Allison, E James LaCourse, Edridah Muheki, Narcis B Kabatereine, J Russell Stothard
BACKGROUND: Intestinal schistosomiasis is of public health importance in Uganda but communities living above 1400 m are not targeted for control as natural transmission is thought unlikely. To assess altitudinal boundaries and at-risk populations, conjoint malacological and epidemiological surveys were undertaken on Mount Elgon (1139 m-3937 m), in Fort Portal crater lakes and in the Rwenzori Mountains (1123 m-4050 m). METHODS: Seventy freshwater habitats [Mount Elgon (37), Fort Portal crater lakes (23), Rwenzori Mountains (8) and Lake Albert (2)] were inspected for Biomphalaria species...
February 6, 2017: Infectious Diseases of Poverty
https://www.readbyqxmd.com/read/28159665/first-characterization-of-smopg1-a-novel-protein-involved-in-gonad-associated-processes-in-schistosoma-mansoni
#13
Steffen Hahnel, Richard Parker-Manuel, Colette Dissous, Katia Cailliau, Christoph G Grevelding
In the context of investigating the exceptional reproductive biology of schistosomes, several studies have focused on the identification and characterization of involved molecules. Among these are cellular tyrosine kinases (CTKs) which control differentiation processes in the female gonads. On the way to unravel CTK-mediated signaling processes in more detail, several upstream- and downstream partners of these CTKs were identified. In this context we present here first data characterizing the novel orphan gene Smopg1...
January 31, 2017: Molecular and Biochemical Parasitology
https://www.readbyqxmd.com/read/28158185/schistosome-infectivity-in-the-snail-biomphalaria-glabrata-is-partially-dependent-on-the-expression-of-grctm6-a-guadeloupe-resistance-complex-protein
#14
Euan R O Allan, Jacob A Tennessen, Stephanie R Bollmann, Patrick C Hanington, Christopher J Bayne, Michael S Blouin
Schistosomiasis is one of the most important neglected tropical diseases. Despite effective chemotherapeutic treatments, this disease continues to afflict hundreds of millions of people. Understanding the natural intermediate snail hosts of schistosome parasites is vital to the suppression of this disease. A recently identified genomic region in Caribbean Biomphalaria glabrata snails strongly influences their resistance to infection by Schistosoma mansoni. This region contains novel genes having structural similarity to known pathogen recognition proteins...
February 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28146171/urban-transmission-of-schistosomiasis-new-epidemiological-situation-in-the-forest-area-of-pernambuco
#15
Elainne Christine de Souza Gomes, Millena Carla da Silva Mesquita, Vitorina Nerivânia Covello Rehn, Wheverton Ricardo Correia do Nascimento, Rodrigo Loyo, Constança Simões Barbosa
Introduction: Schistosomiasis is considered an endemic disease in Vitória de Santo Antão, Pernambuco, a district which has presented both high incidence and prevalence of it for decades. Poor environmental conditions lead to contamination of water sources in rural areas, which are used by the population during daily activities, resulting in typical transmission. Recently, there has been evidence of vector snails in urban areas, which could set a new model for schistosomiasis transmission in this district...
October 2016: Revista Brasileira de Epidemiologia, Brazilian Journal of Epidemiology
https://www.readbyqxmd.com/read/28141943/histological-detection-of-schistosoma-mansoni-infection-in-a-mature-cystic-teratoma-of-the-ovary
#16
Ibrahim Alsharaydeh, Chee K Thum, Jennifer Crane, Kirsty I Munro, Holger W Unger
No abstract text is available yet for this article.
January 31, 2017: Journal of Obstetrics and Gynaecology: the Journal of the Institute of Obstetrics and Gynaecology
https://www.readbyqxmd.com/read/28131054/impedimetric-nanostructured-genosensor-for-detection-of-schistosomiasis-in-cerebrospinal-fluid-and-serum-samples
#17
Giselle S Santos, Cesar A S Andrade, Igor S Bruscky, Leandro B Wanderley, Fabio L Melo, Maria D L Oliveira
Schistosomiasis is a neglected disease closely related to the low levels of social development and a serious public health problem. In this work, we performed an electrochemical detection of Schistosoma mansoni DNA with a self-assembled monolayer of mercaptobenzoic acid (MBA) immobilizing nanostructures composed of gold nanoparticles (AuNPs) and magnetite nanoparticles (Fe3O4_NPs). Electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) were used to monitor the hybridization process. MBA-Fe3O4_NPs-AuNPs-DNAprobe system reveals an effective electrochemical response indicating the surface modification...
January 20, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28126674/synergistic-effects-of-in-vitro-combinations-of-piplartine-epiisopiloturine-and-praziquantel-against-schistosoma-mansoni
#18
Yuri Dias Macedo Campelo, Ana Carolina Mafud, Leiz Maria Costa Véras, Maria Adelaide Guimarães, Lydia F Yamaguchi, David Fernandes Lima, Daniel Dias Rufino Arcanjo, Massuo J Kato, Ronaldo Z Mendonça, Pedro Luiz Silva Pinto, Yvonne Primerano Mascarenhas, Marcos P N Silva, Josué de Moraes, Peter Eaton, José Roberto de Souza de Almeida Leite
Schistosomiasis is a world health problem, and praziquantel is the only drug currently used for the treatment. There is some evidence that extensive monotherapy of praziquantel may be leading to drug resistance in the parasite. In order to find alternative treatments, the effects of the combination of epiisopiloturine (EPI), piplartine (PPT) and praziquantel (PZQ) were evaluated. Similarity analysis of these compounds was performed using optimized molecular structures to compare the shape and the charge modeling of combinations between PZQ and EPI or PPT...
January 23, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28126024/efficacy-and-safety-of-praziquantel-40%C3%A2-mg-kg-in-preschool-aged-and-school-aged-children-a-meta-analysis
#19
REVIEW
Julien Zwang, Piero Olliaro
BACKGROUND: Children carry most of the schistosomiasis burden. While school-aged children are the principal target group of preventive chemotherapy with praziquantel, limited information on efficacy and safety exists for preschool-aged children. METHODS: Here, we conducted a meta-analysis of clinical trials of praziquantel for treating children with any form of schistosomiasis. Efficacy was reported as cure rate (CR) and egg reduction rates (ERR); statistical corrections were applied based on methodological disparities across trials to derive the predicted geometrical mean ERR (pERRgm)...
January 26, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28115686/gender-based-differences-in-water-sanitation-and-hygiene-related-diarrheal-disease-and-helminthic-infections-a-systematic-review-and-meta-analysis
#20
REVIEW
Varadan Sevilimedu, Keisha D Pressley, Kassandra R Snook, Jamesa V Hogges, Maria D Politis, Jessica K Sexton, Carmen H Duke, Blake A Smith, Lena C Swander, Kelly K Baker, Manoj Gambhir, Isaac Chun-Hai Fung
BACKGROUND: Qualitative evidence suggests that inadequate water, sanitation and hygiene (WASH) may affect diarrheal and helminthic infection in women disproportionately. We systematically searched PubMed in June 2014 (updated 2016) and the WHO website, for relevant articles. METHODS: Articles dealing with the public health relevance of helminthic and diarrheal diseases, and highlighting the role of gender in WASH were included. Where possible, we carried out a meta-analysis...
January 22, 2017: Transactions of the Royal Society of Tropical Medicine and Hygiene
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