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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
#2
Hui Xie, Dongjuan Yuan, Shiqi Luo, Xingda Zeng, Xin Zeng, Ping He, Zhiyue Lv, Zhongdao Wu
Angiostrongylus cantonensis (A. cantonensis), a parasitic nematode, is the important neurotropic pathogen which causes human angiostrongyliasis. It has a complex life-cycle and severe parasite-host interaction in contrast to free-living nematode. Establishment of a well-suited life-cycle and in vitro cultivation of A. cantonensis in the laboratory will be one of the key techniques to elucidate the mechanism of parasite-host interaction. However, the low survival and growth rate of worms is still to be the problem...
June 14, 2017: Parasitology Research
#3
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
#4
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
#5
Jacob A Tennessen, Stephanie R Bollmann, Michael S Blouin
The aquatic planorbid snail Biomphalaria glabrate is one of the most intensively-studied mollusks due to its role in the transmission of schistosomiasis. Its 916 Mb genome has recently been sequenced and annotated, but it remains poorly assembled. Here we used targeted capture markers to map over 10,000 B. glabrate scaffolds in a linkage cross of 94 F1 offspring, generating 24 linkage groups. We added additional scaffolds to these linkage groups based on linkage disequilibrium analysis of targeted capture and whole-genome sequences of 96 unrelated snails...
May 19, 2017: G3: Genes—Genomes—Genetics
#6
Xiao-Jun Wu, Nathalie Dinguirard, Grzegorz Sabat, Hong-di Lui, Laura Gonzalez, Michael Gehring, Utibe Bickham-Wright, Timothy P Yoshino
Interactions between early developing Schistosoma mansoni larval stages and the hemolymph of its snail intermediate host represent the first molecular encounter with the snail's immune system. To gain a more comprehensive understanding of this early parasite-host interaction, biotinylated sporocyst tegumental membrane (Mem) proteins and larval transformation proteins (LTP) were affixed to streptavidin-agarose beads and used as affinity matrices to enrich for larval-reactive plasma proteins from susceptible (NMRI) and resistant (BS-90) strains of the snail Biomphalaria glabrata...
May 2017: PLoS Pathogens
#7
Kathrin K Geyer, Umar H Niazi, David Duval, Céline Cosseau, Chad Tomlinson, Iain W Chalmers, Martin T Swain, David J Cutress, Utibe Bickham-Wright, Sabrina E Munshi, Christoph Grunau, Timothy P Yoshino, Karl F Hoffmann
BACKGROUND: The debilitating human disease schistosomiasis is caused by infection with schistosome parasites that maintain a complex lifecycle alternating between definitive (human) and intermediate (snail) hosts. While much is known about how the definitive host responds to schistosome infection, there is comparably less information available describing the snail's response to infection. METHODOLOGY/PRINCIPLE FINDINGS: Here, using information recently revealed by sequencing of the Biomphalaria glabrata intermediate host genome, we provide evidence that the predicted core snail DNA methylation machinery components are associated with both intra-species reproduction processes and inter-species interactions...
May 2017: PLoS Neglected Tropical Diseases
#8
Coen M Adema, LaDeana W Hillier, Catherine S Jones, Eric S Loker, Matty Knight, Patrick Minx, Guilherme Oliveira, Nithya Raghavan, Andrew Shedlock, Laurence Rodrigues do Amaral, Halime D Arican-Goktas, Juliana G Assis, Elio Hideo Baba, Olga L Baron, Christopher J Bayne, Utibe Bickham-Wright, Kyle K Biggar, Michael Blouin, Bryony C Bonning, Chris Botka, Joanna M Bridger, Katherine M Buckley, Sarah K Buddenborg, Roberta Lima Caldeira, Julia Carleton, Omar S Carvalho, Maria G Castillo, Iain W Chalmers, Mikkel Christensens, Sandra Clifton, Celine Cosseau, Christine Coustau, Richard M Cripps, Yesid Cuesta-Astroz, Scott F Cummins, Leon di Stephano, Nathalie Dinguirard, David Duval, Scott Emrich, Cédric Feschotte, Rene Feyereisen, Peter FitzGerald, Catrina Fronick, Lucinda Fulton, Richard Galinier, Sandra G Gava, Michael Geusz, Kathrin K Geyer, Gloria I Giraldo-Calderón, Matheus de Souza Gomes, Michelle A Gordy, Benjamin Gourbal, Christoph Grunau, Patrick C Hanington, Karl F Hoffmann, Daniel Hughes, Judith Humphries, Daniel J Jackson, Liana K Jannotti-Passos, Wander de Jesus Jeremias, Susan Jobling, Bishoy Kamel, Aurélie Kapusta, Satwant Kaur, Joris M Koene, Andrea B Kohn, Dan Lawson, Scott P Lawton, Di Liang, Yanin Limpanont, Sijun Liu, Anne E Lockyer, TyAnna L Lovato, Fernanda Ludolf, Vince Magrini, Donald P McManus, Monica Medina, Milind Misra, Guillaume Mitta, Gerald M Mkoji, Michael J Montague, Cesar Montelongo, Leonid L Moroz, Monica C Munoz-Torres, Umar Niazi, Leslie R Noble, Francislon S Oliveira, Fabiano S Pais, Anthony T Papenfuss, Rob Peace, Janeth J Pena, Emmanuel A Pila, Titouan Quelais, Brian J Raney, Jonathan P Rast, David Rollinson, Izinara C Rosse, Bronwyn Rotgans, Edwin J Routledge, Kathryn M Ryan, Larissa L S Scholte, Kenneth B Storey, Martin Swain, Jacob A Tennessen, Chad Tomlinson, Damian L Trujillo, Emanuela V Volpi, Anthony J Walker, Tianfang Wang, Ittiprasert Wannaporn, Wesley C Warren, Xiao-Jun Wu, Timothy P Yoshino, Mohammed Yusuf, Si-Ming Zhang, Min Zhao, Richard K Wilson
Biomphalaria snails are instrumental in transmission of the human blood fluke Schistosoma mansoni. With the World Health Organization's goal to eliminate schistosomiasis as a global health problem by 2025, there is now renewed emphasis on snail control. Here, we characterize the genome of Biomphalaria glabrata, a lophotrochozoan protostome, and provide timely and important information on snail biology. We describe aspects of phero-perception, stress responses, immune function and regulation of gene expression that support the persistence of B...
May 16, 2017: Nature Communications
#9
REVIEW
Vinícius Barros Ribeiro da Silva, Bruna Rafaella Koresch Leiva Campos, Jamerson Ferreira de Oliveira, Jean-Luc Decout, Maria do Carmo Alves de Lima
Neglected tropical diseases (NTDs) are a group of diseases that, besides prevailing in poverty conditions, contribute to the maintenance of social inequality, being a strong barrier to a country development. Schistosomiasis, a NTD, is a tropical and subtropical disease caused by the trematode Schistosoma mansoni (Africa, Middle East, Caribbean, Brazil, Venezuela, Suriname), japonicum (China, Indonesia, the Philippines), mekongi (several districts of Cambodia and the Lao People's Democratic Republic), intercalatum and guianensis (areas of tropical rainforests in Central Africa) and hematobium (Middle East Africa, Corsica, France) whose adult forms inhabit the mesenteric vessels of the host, while the intermediate forms are found in the aquatic gastropod snails of the genus Biomphalaria...
July 1, 2017: Bioorganic & Medicinal Chemistry
#10
Nana R Diakité, Mirko S Winkler, Jean T Coulibaly, Négnorogo Guindo-Coulibaly, Jürg Utzinger, Eliézer K N'Goran
BACKGROUND: The construction and operation of small multipurpose dams in Africa have a history of altering the transmission of water-based diseases, including schistosomiasis. The current study was designed to investigate the abundance and dynamics of schistosomiasis intermediate host snails and Schistosoma infections in humans during the construction and the first years of operation of a small multipurpose dam in Côte d'Ivoire. METHODS: The study was carried out in Raffierkro and four neighbouring villages in central Côte d'Ivoire between 2007 and 2012...
May 4, 2017: Infectious Diseases of Poverty
#11
Mônica Cristina Barroso Martins, Monique Costa Silva, Hianna Arely Milca Fagundes Silva, Luanna Ribeiro Santos Silva, Mônica Camelo Pessoa de Azevedo Albuquerque, André Lima Aires, Emerson Peter da Silva Falcão, Eugênia C Pereira, Ana Maria Mendonça Albuquerque de Melo, Nicácio Henrique da Silva
This study evaluated the biological activity of an ether extract and barbatic acid (BAR) from Cladia aggregata on embryos and adult mollusks of Biomphalaria glabrata, cercariae of Schistosoma mansoni and the microcrustacean Artemia salina. The ether extract and BAR were obtained by successive extractions with diethyl ether. The obtained extracts were analyzed using thin-layer chromatography (TLC), high-performance liquid chromatography (HPLC), proton nuclear magnetic resonance (¹H-NMR) and infrared (IR) spectroscopy...
March 31, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
#12
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
#13
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...
July 2017: International Journal for Parasitology
#14
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 2017: PLoS Neglected Tropical Diseases
#15
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...
May 2017: Journal of Antibiotics
#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
#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
#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
#19
Rebeca da Silva Cantinha, Sueli Ivone Borrely, Nancy Oguiura, Carlos Alberto de Bragança Pereira, Marcela M Rigolon, Eliana Nakano
In this study, the effects of the heavy metal cadmium on the stress protein HSP70 are investigated in freshwater mollusks Biomphalaria glabrata. Adult snails were exposed for 96h to CdCl2 at concentrations ranging from 0.09 to 0.7mgL(-1) (LC50/96h=0.34 (0.30-0.37). Time and concentration-dependent increases in the expression of HSP70 were observed at sub-lethal levels in the immunoblotting assay. Further, an increased survival to a lethal heat shock was observed in animals pre-exposed to a nonlethal concentration of cadmium, evidencing the induction of acquired tolerance...
June 2017: Ecotoxicology and Environmental Safety
#20
Aly Younes, Hanaa El-Sherief, Fathia Gawish, Marwa Mahmoud
The water bug, Sphaerodema urinator (Hemiptera : Belostomatidae), shares the same habitat of the freshwater snails in ponds, lakes, and streams. Studies conducted in lakes show that fish and crayfish predators play an important role in determining the abundance of freshwater snails. In contrast, shallow ponds and marches often lack fish and crayfish but have abundant insect predators. This study has been carried out to evaluate the predatory potential of S. urinator adult on two freshwater snails that serves as intermediate hosts of Schistosoma...
April 2017: Parasitology Research
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