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Schistosoma mansoni

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https://www.readbyqxmd.com/read/28327819/cellular-immunodeficiency-related-to-chronic-dermatophytosis-in-a-patient-with-schistosoma-mansoni-infection-can-schistosomiasis-induce-immunodeficiency
#1
Maurício Domingues Ferreira, Anna Cristina Collaniere, Dalton Luís Bertolini, Noac Chuffi Barros, Dewton de Moraes Vasconcelos
Here, we describe a case of hepatosplenic schistosomiasis that progressed to widespread persistent dermatophytosis. Significant T and B lymphocytopenia was confirmed. T-cell deficit is associated with increased susceptibility to fungal infections of skin and mucous membranes. The accumulation of a large amount of blood cells in the spleen could have played a crucial role in the development of lymphocytopenia in the present case. Alternatively, the schistosomiasis-induced increase in prostaglandin E2 levels could have inhibited the production of interferon-γ, a cytokine fundamental to fungal resistance...
January 2017: Revista da Sociedade Brasileira de Medicina Tropical
https://www.readbyqxmd.com/read/28327807/ultrastructural-study-of-morphological-changes-in-schistosoma-mansoni-after-in-vitro-exposure-to-the-monoterpene-rotundifolone
#2
Thiago José Matos-Rocha, Marília Gabriela Dos Santos Cavalcanti, José Maria Barbosa-Filho, Ana Silvia Suassuna Carneiro Lúcio, Dyana Leal Veras, Márcia Ortiz Mayo Marques, Luiz Carlos Alves, Fábio André Brayner
INTRODUCTION: Schistosomiasis, a parasitic disease caused by trematode flatworms of the genus Schistosoma, affects more than 200 million people worldwide, and its control is dependent on a single drug, praziquantel. Here, we report the in vitro effect of rotundifolone, a monoterpene isolated from Mentha x villosa (Lamiaceae), on Schistosoma mansoni adult worms. METHODS: The in vitro effect of rotundifolone on adult Schistosoma mansoni was evaluated by analysis of behavior and mortality and through a scanning electron microscopic analysis of ultrastructural changes in the tegument of the worms...
January 2017: Revista da Sociedade Brasileira de Medicina Tropical
https://www.readbyqxmd.com/read/28327791/a-tale-of-two-neglected-tropical-infections-using-gis-to-assess-the-spatial-and-temporal-overlap-of-schistosomiasis-and-leprosy-in-a-region-of-minas-gerais-brazil
#3
David Alexander Phillips, José Antonio Ferreira, Deidra Ansah, Herica Sa Teixeira, Uriel Kitron, Thelma de Filippis, Marcelo H de Alcântara, Jessica K Fairley
BACKGROUND: Despite public health efforts to reduce the global burden of leprosy, gaps remain in the knowledge surrounding transmission of infection. Helminth co-infections have been associated with a shift towards the lepromatous end of the disease spectrum, potentially increasing transmission in co-endemic areas. OBJECTIVES: Using this biologically plausible association, we conducted a geographic information systems (GIS) study to investigate the spatial associations of schistosomiasis and leprosy in an endemic area of Minas Gerais (MG), Brazil...
April 2017: Memórias do Instituto Oswaldo Cruz
https://www.readbyqxmd.com/read/28327785/ultrastructural-alterations-in-schistosoma-mansoni-juvenile-and-adult-male-worms-after-in-vitro-incubation-with-primaquine
#4
Reem Osama A Kamel, Fatma El-Zahraa Anwar Bayaumy
BACKGROUND: Praziquantel has been cited as the only drug for treating schistosomiasis. However, concerns over drug resistance have encouraged the search for novel drug leads. The antimalarial drug primaquine possesses interesting anti-schistosmal properties. OBJECTIVES: This study is the first to document the potential role of primaquine as a schistosomicide and the ultrastructural changes induced by primaquine on juvenile or adult male worms of Schistosoma mansoni...
April 2017: Memórias do Instituto Oswaldo Cruz
https://www.readbyqxmd.com/read/28327187/schistosomiasis-is-more-prevalent-than-previously-thought-what-does-it-mean-for-public-health-goals-policies-strategies-guidelines-and-intervention-programs
#5
REVIEW
Daniel G Colley, Tamara S Andros, Carl H Campbell
Mapping and diagnosis of infections by the three major schistosome species (Schistosoma haematobium, S. mansoni and S. japonicum) has been done with assays that are known to be specific but increasingly insensitive as prevalence declines or in areas with already low prevalence of infection. This becomes a true challenge to achieving the goal of elimination of schistosomiasis because the multiplicative portion of the life-cycle of schistosomes, in the snail vector, favors continued transmission as long as even a few people maintain low numbers of worms that pass eggs in their excreta...
March 22, 2017: Infectious Diseases of Poverty
https://www.readbyqxmd.com/read/28325369/the-compatibility-between-biomphalaria-glabrata-snails-and-schistosoma-mansoni-an-increasingly-complex-puzzle
#6
G Mitta, B Gourbal, C Grunau, M Knight, J M Bridger, A Théron
This review reexamines the results obtained in recent decades regarding the compatibility polymorphism between the snail, Biomphalaria glabrata, and the pathogen, Schistosoma mansoni, which is one of the agents responsible for human schistosomiasis. Some results point to the snail's resistance as explaining the incompatibility, while others support a "matching hypothesis" between the snail's immune receptors and the schistosome's antigens. We propose here that the two hypotheses are not exclusive, and that the compatible/incompatible status of a particular host/parasite couple probably reflects the balance of multiple molecular determinants that support one hypothesis or the other...
2017: Advances in Parasitology
https://www.readbyqxmd.com/read/28322847/identification-and-functional-characterization-of-oncomelania-hupensis-macrophage-migration-inhibitory-factor-involved-in-the-snail-host-innate-immune-response-to-the-parasite-schistosoma-japonicum
#7
Shuaiqin Huang, Yunchao Cao, Mingke Lu, Wenfeng Peng, Jiaojiao Lin, Chongti Tang, Liang Tang
Schistosomiasis, caused by parasitic trematodes of the genus Schistosoma, remains a devastating public health problem, with over 200 million people infected and 779 million people at risk worldwide, especially in developing countries. The freshwater amphibious snail Oncomelania hupensis is the obligate intermediate host of Schistosoma japonicum. This unique and long-standing host-parasite interaction highlights the biomedical importance of the molecular and cellular mechanisms involved in the snail immune defense response against schistosome infection...
March 17, 2017: International Journal for Parasitology
https://www.readbyqxmd.com/read/28319196/h-channels-in-embryonic-biomphalaria-glabrata-cell-membranes-putative-roles-in-snail-host-schistosome-interactions
#8
Brandon J Wright, Utibe Bickham-Wright, Timothy P Yoshino, Meyer B Jackson
The human blood fluke Schistosoma mansoni causes intestinal schistosomiasis, a widespread neglected tropical disease. Infection of freshwater snails Biomphalaria spp. is an essential step in the transmission of S. mansoni to humans, although the physiological interactions between the parasite and its obligate snail host that determine success or failure are still poorly understood. In the present study, the B. glabrata embryonic (Bge) cell line, a widely used in vitro model for hemocyte-like activity, was used to investigate membrane properties, and assess the impact of larval transformation proteins (LTP) on identified ion channels...
March 20, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28316416/murine-hepatocytes-dna-changes-as-an-assessment-of-the-immunogenicity-of-potential-anti-schistosomal-vaccines-experimentally
#9
Samia E Etewa, Mohamed H A Hegab, Ashraf S Metwally, Somia H Abd Allah, Sally M Shalaby, Amal S El-Shal, Mohamed Baredy, Mahmoud A El Shafey, Howayda S F Moawad
Hepatic affection by granulomatous inflammation in schistosomiasis suggested that a potential anti-pathology vaccine could be generated based on limiting the presence of hazardous hepatocytes induced apoptosis and caused reduction of granulomas number and size . So, this work is concerned with experimental assessment of the efficacy of different Schistosoma mansoni antigens (SEA, SWAP and combined SEA and SWAP) on murine liver after challenge by Schistosoma infection, histopathological, histochemical and molecular investigations were performed on sixty male laboratory bred Swiss Albino mice...
March 2017: Journal of Parasitic Diseases: Official Organ of the Indian Society for Parasitology
https://www.readbyqxmd.com/read/28293033/ivermectin-efficacy-against-biomphalaria-intermediate-host-snail-vectors-of-schistosomiasis
#10
Naftale Katz, Neusa Araújo, Paulo Marcos Zech Coelho, Carlos Medicis Morel, Ana Rosa Linde-Arias, Takeshi Yamada, Yuki Horimatsu, Koh Suzuki, Toshiaki Sunazuka, Satoshi Ōmura
The impact of ivermectin on adult snails of the genus Biomphalaria (B. glabrata, B. tenagophila and B. straminea), B. glabrata infected with Schistosoma mansoni, snail egg-masses cercariae and miracidia, as well as on guppy fish (Poecilia reticulata) was examined and evaluated. Biomphalaria snails, egg-masses, parasite stages and guppies were all exposed to different concentrations of ivermectin for 24 h, followed by regular observations of mortality. The calculated lethal doses of ivermectin were around an LD50 of 0...
March 15, 2017: Journal of Antibiotics
https://www.readbyqxmd.com/read/28288799/structure-and-kinetics-assays-of-recombinant-schistosoma-mansoni-dihydrofolate-reductase
#11
Vitor Hugo Balasco Serrão, Larissa Romanello, Alexandre Cassago, Juliana Roberta Torini de Souza, Juliana Cheleski, Ricardo DeMarco, José Brandão-Neto, Humberto D'Muniz Pereira
The parasite Schistosoma mansoni possesses all pathways for pyrimidine biosynthesis, in which dihydrofolate reductase (DHFR), thymidylate cycle participants, is essential for nucleotide metabolism to obtain energy and structural nucleic acids. Thus, DHFRs have been widely suggested as therapeutic targets for the treatment of infectious diseases. In this study, we expressed recombinant SmDHFR in a heterologous manner to obtain structural, biochemical and kinetic information. X-ray diffraction of recombinant SmDHFR at 1...
March 11, 2017: Acta Tropica
https://www.readbyqxmd.com/read/28286672/is-ultrasonography-useful-for-population-studies-on-schistosomiasis-mansoni-an-evaluation-based-on-a-survey-on-a-population-from-kome-island-tanzania
#12
Mats Sl Asztely, Bo Eriksson, Reverianus M Gabone, Lars-Åke Nilsson
BACKGROUND: Observation of characteristic alterations at liver ultrasonography in clinical schistosomiasis mansoni cases has initiated utilization of this examination method in population surveys in areas where this disease is endemic. PURPOSE: To present results of liver ultrasonography and their relation to epidemiological data of a population in an area endemic for S. mansoni, to estimate the precision of classification of periportal anatomy changes known as periportal fibrosis (PPF), and to evaluate the relevance of ultrasonography in epidemiological studies on S...
December 2016: Acta Radiologica Open
https://www.readbyqxmd.com/read/28273080/geospatial-distribution-of-intestinal-parasitic-infections-in-rio-de-janeiro-brazil-and-its-association-with-social-determinants
#13
Clarissa Perez Faria, Graziela Maria Zanini, Gisele Silva Dias, Sidnei da Silva, Marcelo Bessa de Freitas, Ricardo Almendra, Paula Santana, Maria do Céu Sousa
BACKGROUND: Intestinal parasitic infections remain among the most common infectious diseases worldwide. This study aimed to estimate their prevalence and provide a detailed analysis of geographical distribution of intestinal parasites in the metropolitan region of Rio de Janeiro, considering demographic, socio-economic, and epidemiological contextual factors. METHODS/PRINCIPAL FINDINGS: The cross-section survey was conducted among individuals attending the Evandro Chagas National Institute of Infectious Diseases (FIOCRUZ, RJ) during the period from April 2012 to February 2015...
March 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28268114/s-mansoni-t-cruzi-co-infection-modulates-arginase-1-inos-expression-liver-and-heart-disease-in-mice
#14
João Paulo Ferreira Rodrigues, Ivo Santana Caldas, Reggiani Vilela Gonçalves, Leonardo Augusto Almeida, Raquel Lopes Martins Souza, Rômulo Dias Novaes
Although Schistosoma species and Trypanosoma cruzi share common endemic areas, co-infections by these parasites remains overlooked. By using a murine model of S. mansoni and T. cruzi co-infection, we investigated if and to what extent these infections might interact to change the pathological outcomes typically observed when the host is infected by a single parasite species. Swiss mice were randomized into four groups: uninfected (NI) and those infected by S. mansoni (SM), T. cruzi (TC) or co-infected (SM + TC)...
March 4, 2017: Nitric Oxide: Biology and Chemistry
https://www.readbyqxmd.com/read/28259528/structural-insights-of-smkdac8-inhibitors-targeting-schistosoma-epigenetics-through-a-combined-structure-based-3d-qsar-in-vitro-and-synthesis-strategy
#15
Flavio Ballante, D Rajasekhar Reddy, Nancy J Zhou, Garland R Marshall
A predictive structure-based 3D QSAR (COMBINEr 2.0) model of the Schistosoma mansoni lysine deacetylase 8 enzyme (SmKDAC8) was developed, validated and used to perform virtual screening (VS) of the NCI Diversity Set V database (1593 compounds). Three external datasets (with congeneric structures to those experimentally resolved in complexes by X-ray and previously reported as SmKDAC8 inhibitors) were employed to compose and validate the most predictive model. Two series characterized by 104 benzodiazepine derivatives (BZDs) and 60 simplified largazole analogs (SLAs), recently reported by our group as human KDAC inhibitors, were tested for their inhibition potency against SmKDAC8 to probe the predictive capability of the quantitative models against compounds with diverse structures...
February 13, 2017: Bioorganic & Medicinal Chemistry
https://www.readbyqxmd.com/read/28257854/integrated-multi-omic-analyses-in-biomphalaria-schistosoma-dialogue-reveal-the-immunobiological-significance-of-frep-smpomuc-interaction
#16
Anaïs Portet, Silvain Pinaud, Guillaume Tetreau, Richard Galinier, Céline Cosseau, David Duval, Christoph Grunau, Guillaume Mitta, Benjamin Gourbal
The fresh water snail Biomphalaria glabrata is one of the vectors of the trematode pathogen Schistosoma mansoni, which is one of the agents responsible of human schistosomiasis. In this host-parasite interaction, co-evolutionary dynamic results into an infectivity mosaic known as compatibility polymorphism. Integrative approaches including large scale molecular approaches have been conducted in recent years to improve our understanding of the mechanisms underlying compatibility. This review presents the combination of integrated Multi-Omic approaches leading to the discovery of two repertoires of polymorphic and/or diversified interacting molecules: the parasite antigens S...
February 28, 2017: Developmental and Comparative Immunology
https://www.readbyqxmd.com/read/28253264/a-multistrain-approach-to-studying-the-mechanisms-underlying-compatibility-in-the-interaction-between-biomphalaria-glabrata-and-schistosoma-mansoni
#17
Richard Galinier, Emmanuel Roger, Yves Moné, David Duval, Anaïs Portet, Silvain Pinaud, Cristian Chaparro, Christoph Grunau, Clémence Genthon, Emeric Dubois, Anne Rognon, Nathalie Arancibia, Bernard Dejean, André Théron, Benjamin Gourbal, Guillaume Mitta
In recent decades, numerous studies have sought to better understand the mechanisms underlying the compatibility between Biomphalaria glabrata and Schistosoma mansoni. The developments of comparative transcriptomics, comparative genomics, interactomics and more targeted approaches have enabled researchers to identify a series of candidate genes. However, no molecular comparative work has yet been performed on multiple populations displaying different levels of compatibility. Here, we seek to fill this gap in the literature...
March 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28246533/use-of-molecular-methods-for-the-rapid-mass-detection-of-schistosoma-mansoni-platyhelminthes-trematoda-in-biomphalaria-spp-gastropoda-planorbidae
#18
Roberta Lima Caldeira, Liana Konovaloffi Jannotti-Passos, Omar Dos Santos Carvalho
The low stringency-polymerase chain reaction (LS-PCR) and loop-mediated isothermal amplification (LAMP) assays were used to detect the presence of S. mansoni DNA in (1) Brazilian intermediate hosts (Biomphalaria glabrata, B. straminea, and B. tenagophila) with patent S. mansoni infections, (2) B. glabrata snails with prepatent S. mansoni infections, (3) various mixtures of infected and noninfected snails; and (4) snails infected with other trematode species. The assays showed high sensitivity and specificity and could detect S...
2017: Journal of Tropical Medicine
https://www.readbyqxmd.com/read/28245883/schistosomiasis-and-soil-transmitted-helminthiasis-in-rwanda-an-update-on-their-epidemiology-and-control
#19
REVIEW
Nadine Rujeni, Domenica Morona, Eugene Ruberanziza, Humphrey D Mazigo
Even though Rwanda lies within a region that has a high prevalence of schistosomiasis and soil-transmitted helminth (STH) infections, epidemiological information regarding these infections in the country remains scarce. The present review attempts to compile the available data on schistosomiasis and STHs, from 1940 to 2014, to provide an insight on the epidemiological profile of these infections. This information will, in turn, support the design and implementation of sustainable control measures. The available records indicate that only Schistosoma mansoni and all the major species of STHs are endemic in Rwanda...
March 1, 2017: Infectious Diseases of Poverty
https://www.readbyqxmd.com/read/28243983/bioactive-compounds-of-aspergillus-terreus-f7-an-endophytic-fungus-from-hyptis-suaveolens-l-poit
#20
Igor Pereira da Silva, Elson Brissow, Luis Claudio Kellner Filho, Jaqueline Senabio, Kátia Aparecida de Siqueira, Samuel Vandresen Filho, Jaqueline Lopes Damasceno, Suzana Amorim Mendes, Denise Crispim Tavares, Lizandra Guidi Magalhães, Policarpo Ademar Sales Junior, Ana Helena Januário, Marcos Antônio Soares
The compounds terrein (1), butyrolactone I (2), and butyrolactone V (3) were isolated from the ethyl acetate extract (EtOAc) of the endophytic fungus Aspergillus terreus-F7 obtained from Hyptis suaveolens (L.) Poit. The extract and the compounds presented schistosomicidal activity against Schistosoma mansoni; at 100 µg/mL for EtOAc extract, 1297.3 µM for compound 1, 235.6 µM for compound 2, and 454.1 µM for compound 3, they killed 100% of the parasites after 72 h of treatment. Compounds 1, 2, and 3 exerted moderate leishmanicidal activity against Leishmania amazonensis (IC50 ranged from 23...
March 2017: World Journal of Microbiology & Biotechnology
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