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International Journal for Parasitology

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https://www.readbyqxmd.com/read/28903026/differential-expression-of-genes-in-fetal-brain-as-a-consequence-of-maternal-protein-deficiency-and-nematode-infection
#1
Manjurul Haque, Lisa M Starr, Kristine G Koski, Marilyn E Scott
Maternal dietary protein deficiency and gastrointestinal (GI) nematode infection during early pregnancy have negative impacts on both maternal placental gene expression and fetal growth in the mouse. Here we used next-generation RNA sequencing (RNA-Seq) to test our hypothesis that maternal protein deficiency and/or nematode infection also alter the expression of genes in the developing fetal brain. Outbred pregnant CD1 mice were used in a 2x2 design with two levels of dietary protein (24% versus 6%) and two levels of infection (repeated sham versus Heligmosomoides bakeri beginning at gestation day 5)...
September 10, 2017: International Journal for Parasitology
https://www.readbyqxmd.com/read/28903025/experimental-neospora-caninum-infection-in-chickens-gallus-gallus-domesticus-with-oocysts-and-tachyzoites-of-two-recent-isolates-reveals-resistance-to-infection
#2
Solange Oliveira, Juliana Aizawa, Herbert Sousa Soares, Daniela Pontes Chiebao, Márcio Botelho de Castro, Aline S Hora, Marcos Gomes Lopes, Gereon Schares, Mark C Jenkins, Oliver C H Kwok, Ricardo Augusto Dias, Solange Maria Gennari, Jitender P Dubey, Hilda Fátima Jesus Pena
The importance of birds in the biological cycle of Neospora caninum is not clear. We report unsuccessful Neospora infection in chickens (Gallus gallus domesticus) using two isolates of N. caninum. In experiment #1, 30 White Leghorn chickens were orally inoculated with viable N. caninum oocysts (NC-SP1 isolate, 200 oocysts per bird) via the crop at 21 days of age. Groups of three birds were euthanized at intervals of 7 days (a total of 9 weeks) and one group was challenged with the same oocyst dose at 37 days p...
September 10, 2017: International Journal for Parasitology
https://www.readbyqxmd.com/read/28903024/neospora-caninum-in-non-pregnant-and-pregnant-mouse-models-cross-talk-between-infection-and-immunity
#3
REVIEW
Adriana Aguado-Martínez, Afonso P Basto, Alexandre Leitão, Andrew Hemphill
Neospora caninum is a cyst-forming coccidian which causes abortion in cattle, with a high economic impact globally. Vaccination is considered to be the most cost-effective strategy to control and prevent bovine neosporosis. However, there is no commercial vaccine available to date. To investigate this disease under laboratory conditions, mouse models were developed, and they have been efficiently used as an initial proof-of-concept platform to investigate different immunogenic formulations. We here provide a detailed review on the current knowledge on immunity against neosporosis in non-pregnant as well as pregnant mice, and present a general overview of the most relevant parameters that may be responsible for protective immunity, which in turn could be relevant for vaccine development...
September 10, 2017: International Journal for Parasitology
https://www.readbyqxmd.com/read/28899692/in-vitro-efficacy-of-bumped-kinase-inhibitors-against-besnoitia-besnoiti-tachyzoites
#4
Alejandro Jiménez-Meléndez, Kayode K Ojo, Alexandra M Wallace, Tess R Smith, Andrew Hemphill, Vreni Balmer, Javier Regidor-Cerrillo, Luis M Ortega-Mora, Adrian B Hehl, Erkang Fan, Dustin J Maly, Wesley C Van Voorhis, Gema Álvarez-García
Besnoitia besnoiti is an apicomplexan parasite responsible for bovine besnoitiosis, a chronic and debilitating disease that causes systemic and skin manifestations and sterility in bulls. Neither treatments nor vaccines are currently available. In the search for therapeutic candidates, calcium-dependent protein kinases have arisen as promising drug targets in other apicomplexans (e.g. Neospora caninum, Toxoplasma gondii, Plasmodium spp. and Eimeria spp.) and are effectively targeted by bumped kinase inhibitors...
September 9, 2017: International Journal for Parasitology
https://www.readbyqxmd.com/read/28899691/transcriptome-modulation-of-bovine-trophoblast-cells-in-vitro-by-neospora-caninum
#5
Pilar Horcajo, Laura Jiménez-Pelayo, Marta García-Sánchez, Javier Regidor-Cerrillo, Esther Collantes-Fernández, Daniel Rozas, Nina Hambruch, Christiane Pfarrer, Luis Miguel Ortega-Mora
Neospora caninum is one of the most efficient transplacentally transmitted pathogens in cattle and is a cause of abortion in this domestic species. The invasion and proliferation of Neospora caninum in the placenta and its dissemination to the foetus are crucial events in the outcome of an infection. In the bovine placenta, the placentomes are formed by maternal caruncles, which are delimited by a maternal epithelium and foetal cotyledons, which are delimited by an epithelial layer named the trophoblast. These epithelia form a physical barrier against foetal infection...
September 9, 2017: International Journal for Parasitology
https://www.readbyqxmd.com/read/28899690/advances-in-bumped-kinase-inhibitors-for-human-and-animal-therapy-for-cryptosporidiosis
#6
Matthew A Hulverson, Ryan Choi, Samuel L M Arnold, Deborah A Schaefer, Andrew Hemphill, Molly C McCloskey, Dana P Betzer, Joachim Müller, Rama S R Vidadala, Grant R Whitman, Kasey L Rivas, Lynn K Barrett, Robert C Hackman, Melissa S Love, Case W McNamara, Thomas K Shaughnessy, Alison Kondratiuk, Matthew Kurnick, Patricia N Banfor, James J Lynch, Gail M Freiberg, Dale J Kempf, Dustin J Maly, Michael W Riggs, Kayode K Ojo, Wesley C Van Voorhis
Improvements have been made to the safety and efficacy of bumped kinase inhibitors, and they are advancing toward human and animal use for treatment of cryptosporidiosis. As the understanding of bumped kinase inhibitor pharmacodynamics for cryptosporidiosis therapy has increased, it has become clear that better compounds for efficacy do not necessarily require substantial systemic exposure. We now have a bumped kinase inhibitor with reduced systemic exposure, acceptable safety parameters, and efficacy in both the mouse and newborn calf models of cryptosporidiosis...
September 9, 2017: International Journal for Parasitology
https://www.readbyqxmd.com/read/28893637/advances-in-the-diagnosis-of-bovine-besnoitiosis-current-options-and-applications-for-control
#7
REVIEW
Daniel Gutiérrez-Expósito, Ignacio Ferre, Luis M Ortega-Mora, Gema Álvarez-García
Bovine besnoitiosis, which is caused by the tissue cyst-forming intracellular parasite Besnoitia besnoiti, is a chronic and debilitating disease that is responsible for severe economic losses in the cattle raised under extensive husbandry systems. The absence of vaccines, treatments or a health scheme at local, national and international levels has led to a rapid spread of bovine besnoitiosis from western Europe towards eastern countries and northwards. Moreover, this parasitic disease is widely present in many sub-Saharan countries...
September 9, 2017: International Journal for Parasitology
https://www.readbyqxmd.com/read/28893639/on-the-application-of-reverse-vaccinology-to-parasitic-diseases-a-perspective-on-feature-selection-and-ranking-of-vaccine-candidates
#8
Stephen J Goodswen, Paul J Kennedy, John T Ellis
Reverse vaccinology has the potential to rapidly advance vaccine development against parasites, but it is unclear which features studied in silico will advance vaccine development. Here we consider Neospora caninum which is a globally distributed protozoan parasite causing significant economic and reproductive loss to cattle industries worldwide. The aim of this study was to use a reverse vaccinology approach to compile a worthy vaccine candidate list for N. caninum, including proteins containing pathogen-associated molecular patterns to act as vaccine carriers...
September 8, 2017: International Journal for Parasitology
https://www.readbyqxmd.com/read/28893638/innate-immune-responses-play-a-key-role-in-controlling-infection-of-the-intestinal-epithelium-by-cryptosporidium
#9
REVIEW
Fabrice Laurent, Sonia Lacroix-Lamandé
Cryptosporidium infection leads to acute diarrhea worldwide. The development of cryptosporidiosis is closely related to the immune status of its host, affecting primarily young ruminants, infants, and immunocompromised individuals. In recent years, several studies have improved our knowledge on the immune mechanisms responsible for the control of the acute phase of the infection and have highlighted the importance of innate immunity. The parasite develops in the apical side of intestinal epithelial cells, giving these cells a central role, as they are both the exclusive host cell for replication of the parasite and participate in the protective immune response...
September 8, 2017: International Journal for Parasitology
https://www.readbyqxmd.com/read/28893636/advances-in-the-application-of-genetic-manipulation-methods-to-apicomplexan-parasites
#10
REVIEW
C E Suarez, R P Bishop, H F Alzan, W A Poole, B M Cooke
Apicomplexan parasites such as Babesia, Theileria, Eimeria, Cryptosporidium and Toxoplasma greatly impact animal health globally, and improved, cost-effective measures to control them are urgently required. These parasites have complex multi-stage life cycles including obligate intracellular stages. Major gaps in our understanding of the biology of these relatively poorly characterized parasites and the diseases they cause severely limit options for designing novel control methods. Here we review potentially important shared aspects of the biology of these parasites, such as cell invasion, host cell modification, and asexual and sexual reproduction, and explore the potential of the application of relatively well-established or newly emerging genetic manipulation methods (GMMs), such as classical transfection or gene editing, respectively, for closing important gaps in our knowledge of the function of specific genes and proteins, and the biology of these parasites...
September 8, 2017: International Journal for Parasitology
https://www.readbyqxmd.com/read/28870755/high-seroprevalence-of-toxoplasma-gondii-and-probability-of-detecting-tissue-cysts-in-backyard-laying-hens-compared-with-hens-from-large-free-range-farms
#11
G Schares, B Bangoura, F Randau, T Goroll, M Ludewig, P Maksimov, B Matzkeit, M Sens, A Bärwald, F J Conraths, M Opsteegh, J Van der Giessen
Serological assays are commonly used to determine the prevalence of Toxoplasma gondii infection in livestock, but the predictive value of seropositivity with respect to the presence of infective tissue cysts is less clear. The present study aimed at the identification of seropositive and seronegative free-range laying hens from organic and backyard farms, and the relationship with the presence of viable tissue cysts. In addition, potential risk and protective factors on the selected farms were investigated...
September 5, 2017: International Journal for Parasitology
https://www.readbyqxmd.com/read/28864033/characterising-the-effect-of-antimalarial-drugs-on-the-maturation-and-clearance-of-murine-blood-stage-plasmodium-parasites-in-vivo
#12
David S Khoury, Deborah Cromer, Trish Elliott, Megan S F Soon, Bryce S Thomas, Kylie R James, Shannon E Best, Rosemary A Aogo, Jessica A Engel, Kate H Gartlan, Jasmin Akter, Ismail Sebina, Ashraful Haque, Miles P Davenport
The artemisinins are the first-line therapy for severe and uncomplicated malaria, since they cause rapid declines in parasitemia after treatment. Despite this, in vivo mechanisms underlying this rapid decline remain poorly characterised. The overall decline in parasitemia is the net effect of drug inhibition of parasites and host clearance, which competes against any ongoing parasite proliferation. Separating these mechanisms in vivo was not possible through measurements of total parasitemia alone. Therefore, we employed an adoptive transfer approach in which C57BL/6J mice were transfused with Plasmodium berghei ANKA strain-infected, fluorescent red blood cells, and subsequently drug-treated...
August 31, 2017: International Journal for Parasitology
https://www.readbyqxmd.com/read/28859850/il-4-5-signalling-plays-an-important-role-during-litomosoides-sigmodontis-infection-influencing-both-immune-system-regulation-and-tissue-pathology-in-the-thoracic-cavity
#13
Manuel Ritter, Ruth S Tamadaho, Judith Feid, Wenzel Vogel, Katharina Wiszniewsky, Sven Perner, Achim Hoerauf, Laura E Layland
Approximately 100 million people suffer from filarial diseases including lymphatic filariasis (elephantiasis), onchocerciasis (river blindness) and loiasis. These diseases are amongst the most devastating of the neglected tropical diseases in terms of social and economic impact. Moreover, many infection-induced immune mechanisms in the host, their relationship to disease-related symptoms and the development of pathology within the site of infection remain unclear. To improve on current drug therapies or vaccines, further studies are necessary to decipher the mechanisms behind filaria-driven immune responses and pathology development, and thus the rodent model of Litomosoides sigmodontis can be used to unravel host-filaria interactions...
August 30, 2017: International Journal for Parasitology
https://www.readbyqxmd.com/read/28859849/comparative-analysis-of-the-immune-responses-induced-by-native-versus-recombinant-versions-of-the-asp-based-vaccine-against-the-bovine-intestinal-parasite-cooperia-oncophora
#14
Ana González-Hernández, Jimmy Borloo, Iris Peelaers, Stijn Casaert, Georges Leclercq, Edwin Claerebout, Peter Geldhof
The protective capacities of a native double-domain activation-associated secreted protein (ndd-ASP)-based vaccine against the cattle intestinal nematode Cooperia oncophora has previously been demonstrated. However, protection analysis upon vaccination with a recombinantly produced antigen has never been performed. Therefore, the aim of the current study was to test the protective potential of a Pichia-produced double-domain ASP (pdd-ASP)-based vaccine against C. oncophora. Additionally, we aimed to compare the cellular and humoral mechanisms underlying the vaccine-induced responses by the native (ndd-ASP) and recombinant vaccines...
August 30, 2017: International Journal for Parasitology
https://www.readbyqxmd.com/read/28855143/lack-of-genetic-structure-in-pinworm-populations-from-new-world-primates-in-forest-fragments
#15
Brenda Solórzano-García, Jaime Gasca-Pineda, Robert Poulin, Gerardo Pérez-Ponce de León
Microevolutionary processes in parasites are driven by factors related to parasite biology, host abundance and dispersal, and environmental conditions. Here, we test the prediction that isolation of host populations results in reduced genetic diversity and high differentiation among parasite populations. We conducted a population genetic analysis of two pinworms, Trypanoxyuris minutus and Trypanoxyuris atelis, commonly found parasitizing howler and spider monkeys in tropical rainforests across south-eastern Mexico, whose populations are currently isolated due to anthropogenic habitat loss and fragmentation...
August 30, 2017: International Journal for Parasitology
https://www.readbyqxmd.com/read/28807668/evidence-that-blood-flukes-trematoda-aporocotylidae-of-chondrichthyans-infect-bivalves-as-intermediate-hosts-indications-of-an-ancient-diversification-of-the-schistosomatoidea
#16
Thomas H Cribb, Rowan C Chick, Wayne O'Connor, Stephan O'Connor, Daniel Johnson, Kim B Sewell, Scott C Cutmore
Blood flukes (Aporocotylidae) of actinopterygians (bony fishes) have been shown to infect freshwater gastropods and marine polychaetes as intermediate hosts. However, no life cycle is known for any aporocotylid of chondrichthyans (cartilaginous fishes) and no adult aporocotylid has been linked to a cercaria infecting a bivalve. Here we report two novel infections that fill these gaps. Cercariae consistent with the family Aporocotylidae were found developing in sporocysts in the gonad of the surf pipi, Donax deltoides Lamarck, 1818 (Bivalvia: Donacidae), from Stockton Beach, central New South Wales, Australia...
August 12, 2017: International Journal for Parasitology
https://www.readbyqxmd.com/read/28797792/specific-status-of-echinococcus-canadensis-cestoda-taeniidae-inferred-from-nuclear-and-mitochondrial-gene-sequences
#17
Tetsuya Yanagida, Antti Lavikainen, Eric P Hoberg, Sergey Konyaev, Akira Ito, Marcello Otake Sato, Vladimir A Zaikov, Kimberlee Beckmen, Minoru Nakao
The specific status of Echinococcus canadensis has long been controversial, mainly because it consists of the mitochondrial lineages G6, G7, G8 and G10 with different host affinity: G6 (camel strain) and G7 (pig strain) with domestic cycles and G8 (cervid strain) and G10 (Fennoscandian cervid strain) with sylvatic or semi-domestic cycles. There is an argument whether the mitochondrial lineages should be recognised as separate species which correspond to the biological or epidemiological aggregation. In the present study, the specific status of E...
August 7, 2017: International Journal for Parasitology
https://www.readbyqxmd.com/read/28797791/the-use-of-nemabiome-metabarcoding-to-explore-gastro-intestinal-nematode-species-diversity-and-anthelmintic-treatment-effectiveness-in-beef-calves
#18
Russell W Avramenko, Elizabeth M Redman, Roy Lewis, Murilo A Bichuette, Bruna M Palmeira, Thomas A Yazwinski, John S Gilleard
Next-generation deep amplicon sequencing, or metabarcoding, has revolutionized the study of microbial communities in humans, animals and the environment. However, such approaches have yet to be applied to parasitic helminth communities. We recently described the first example of such a method - nemabiome sequencing - based on deep-amplicon sequencing of internal transcribed spacer 2 (ITS-2) rDNA, and validated its ability to quantitatively assess the species composition of cattle gastro-intestinal nematode (GIN) communities...
August 7, 2017: International Journal for Parasitology
https://www.readbyqxmd.com/read/28789836/relationships-among-different-facets-of-host-specificity-in-three-taxa-of-haematophagous-ectoparasites
#19
Luther van der Mescht, Elizabeth M Warburton, Irina S Khokhlova, Maxim V Vinarski, Natalia P Korallo-Vinarskaya, Boris R Krasnov
Host specificity is a fundamental trait of a parasite species. Recently, multiple aspects of host specificity have been recognized, but the relationships between these facets are still poorly understood. Here, we studied pairwise relationships between basic, structural, phylogenetic and geographic host specificity in three taxa of haematophagous ectoparasitic arthropods that differ in tightness of their association with the host. We asked which metrics of host specificity are correlated within each parasite taxon and whether the patterns of the association between different facets of host specificity are similar among parasite taxa...
August 5, 2017: International Journal for Parasitology
https://www.readbyqxmd.com/read/28780153/the-catholic-taste-of-broad-tapeworms-multiple-routes-to-human-infection
#20
Andrea Waeschenbach, Jan Brabec, Tomáš Scholz, D Timothy J Littlewood, Roman Kuchta
Broad tapeworms (Cestoda: Diphyllobothriidea) are the principal agents of widespread food-borne cestodosis. Diphyllobothriosis and diplogonoporosis, caused by members of the genera Diphyllobothrium, Diplogonoporus and Adenocephalus, are the most common fish cestodoses with an estimated 20million people infected worldwide, and has seen recent (re)emergences in Europe due to the increasing popularity of eating raw or undercooked fish. Sparganosis is a debilitating and potentially lethal disease caused by the larvae of the genus Spirometra, which occurs throughout much of the (sub)tropics and is caused by the consumption of raw snakes and frogs, and drinking water contaminated by infected copepods...
August 3, 2017: International Journal for Parasitology
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