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Parasite-host interaction

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https://www.readbyqxmd.com/read/29150386/role-of-endosymbionts-in-insect-parasitic-nematode-interactions
#1
REVIEW
Ioannis Eleftherianos, Shruti Yadav, Eric Kenney, Dustin Cooper, Yaprak Ozakman, Jelena Patrnogic
Endosymbiotic bacteria exist in many animals where they develop relationships that affect certain physiological processes in the host. Insects and their nematode parasites form great models for understanding the genetic and molecular basis of immune and parasitic processes. Both organisms contain endosymbionts that possess the ability to interfere with certain mechanisms of immune function and pathogenicity. This review summarizes recent information on the involvement of insect endosymbionts in the response to parasitic nematode infections, and the influence of nematode endosymbionts on specific aspects of the insect immune system...
November 14, 2017: Trends in Parasitology
https://www.readbyqxmd.com/read/29146449/an-integrated-metabolic-consequence-of-hepatospora-eriocheir-infection-in-the-chinese-mitten-crab-eriocheir-sinensis
#2
Zhengfeng Ding, Jing Pan, Hua Huang, Gongcheng Jiang, Jianqin Chen, Xueshen Zhu, Renlei Wang, Guohua Xu
Despite the economic and evolutionary importance of aquatic host-infecting microsporidian species, at present, limited information has been provided about the microsporidia-host interactions. This study focused on Hepatospora eriocheir, an emerging microsporidian pathogen for the Chinese mitten crab Eriocheir sinensis. Hypertrophy of hepatopancreas cells was a common feature of H. eriocheir infection. More importantly, mitochondria of the hepatopancreas were drawn around the H. eriocheir, most likely to aid the uptake of ATP directly from the host...
November 13, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/29145392/conservation-of-a-microrna-cluster-in-parasitic-nematodes-and-profiling-of-mirnas-in-excretory-secretory-products-and-microvesicles-of-haemonchus-contortus
#3
Henry Y Gu, Neil D Marks, Alan D Winter, William Weir, Thomas Tzelos, Tom N McNeilly, Collette Britton, Eileen Devaney
microRNAs are small non-coding RNAs that are important regulators of gene expression in a range of animals, including nematodes. We have analysed a cluster of four miRNAs from the pathogenic nematode species Haemonchus contortus that are closely linked in the genome. We find that the cluster is conserved only in clade V parasitic nematodes and in some ascarids, but not in other clade III species nor in clade V free-living nematodes. Members of the cluster are present in parasite excretory-secretory products and can be detected in the abomasum and draining lymph nodes of infected sheep, indicating their release in vitro and in vivo...
November 16, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/29138437/photosensitized-ina-labelled-protein-1-phil1-is-novel-component-of-the-inner-membrane-complex-and-is-required-for-plasmodium-parasite-development
#4
Ekta Saini, Mohammad Zeeshan, Declan Brady, Rajan Pandey, Gesine Kaiser, Ludek Koreny, Pradeep Kumar, Vandana Thakur, Shreyansh Tatiya, Nicholas J Katris, Rebecca Stanway Limenitakis, Inderjeet Kaur, Judith L Green, Andrew R Bottrill, David S Guttery, Ross F Waller, Volker Heussler, Anthony A Holder, Asif Mohmmed, Pawan Malhotra, Rita Tewari
Plasmodium parasites, the causative agents of malaria, possess a distinctive membranous structure of flattened alveolar vesicles supported by a proteinaceous network, and referred to as the inner membrane complex (IMC). The IMC has a role in actomyosin-mediated motility and host cell invasion. Here, we examine the location, protein interactome and function of PhIL1, an IMC-associated protein on the motile and invasive stages of both human and rodent parasites. We show that PhIL1 is located in the IMC in all three invasive (merozoite, ookinete-, and sporozoite) stages of development, as well as in the male gametocyte and locates both at the apical and basal ends of ookinete and sporozoite stages...
November 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29137971/clearance-of-schistosome-parasites-by-resistant-genotypes-at-a-single-genomic-region-in-biomphalaria-glabrata-snails-involves-cellular-components-of-the-hemolymph
#5
Euan R O Allan, Benjamin Gourbal, Camila B Dores, Anais Portet, Christopher J Bayne, Michael S Blouin
Schistosomiasis is one of the most detrimental neglected tropical diseases. Controlling the spread of this parasitic illness requires effective sanitation, access to chemotherapeutic drugs, and control over populations of the freshwater snails, such as Biomphalaria glabrata, that are essential intermediate hosts for schistosomes. Effectively controlling this disease, while minimizing ecological implications of such control, will require an extensive understanding of the immunological interactions between schistosomes and their molluscan intermediate hosts...
November 11, 2017: International Journal for Parasitology
https://www.readbyqxmd.com/read/29133829/differential-responses-of-body-growth-to-artificial-warming-between-parasitoids-and-hosts-and-the-consequences-for-plant-seed-damage
#6
Xinqiang Xi, Yangheshan Yang, Xiaocheng Yang, Sören Nylin, Nico Eisenhauer, Shucun Sun
Temperature increase may disrupt trophic interactions by differentially changing body growth of the species involved. In this study, we tested whether the response of body growth to artificial warming (~2.2 °C) of a solitary koinobiont endo-parasitoid wasp (Pteromalus albipennis, Hymenoptera: Pteromalidae) differed from its main host tephritid fly (Tephritis femoralis, Diptera: Tephritidae; pre-dispersal seed predator), and whether the plant seed damage caused by wasp-parasitized and unparasitized maggots (larval flies) were altered by warming...
November 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29132934/the-evolution-of-pathogen-virulence-effects-of-transitions-between-host-types
#7
Paul David Williams, Stephanie Jill Kamel
Much of evolutionary epidemiology theory is derived from a perspective in which all hosts, and all parasites, are epidemiologically equivalent. This stands in contrast to the well-documented existence of the numerous processes generating heterogeneity among hosts and parasites that can profoundly influence evolutionary/epidemiological dynamics. Age-related immunological changes, inequities in nutritional status, and interactions between parasites via coinfection are just a few of the many factors that generate heterogeneity among hosts in the ways they express susceptibility to, and respond to infection by, a focal pathogen...
November 10, 2017: Journal of Theoretical Biology
https://www.readbyqxmd.com/read/29132066/fungal-interactions-with-the-human-host-exploring-the-spectrum-of-symbiosis
#8
REVIEW
Rebecca A Hall, Mairi C Noverr
Fungi are ubiquitous transient or persistent human colonisers, and form the mycobiome with shifts in niche specific mycobiomes (dysbiosis) being associated with various diseases. These complex interactions of fungal species with the human host can be viewed as a spectrum of symbiotic relationships (i.e. commensal, parasitic, mutualistic, amensalistic). The host relevant outcome of the relationship is the damage to benefit ratio, elegantly described in the damage response framework. This review focuses on Candida albicans, which is the most well studied human fungal symbiont clinically and experimentally, its transition from commensalism to parasitism within the human host, and the factors that influence this relationship...
November 10, 2017: Current Opinion in Microbiology
https://www.readbyqxmd.com/read/29131311/hemiparasites-can-transmit-indirect-effects-from-their-host-plants-to-herbivores
#9
Nathan L Haan, Jonathan D Bakker, M Deane Bowers
Parasitic plants can serve as critical intermediaries between their hosts and other organisms; however these relationships are not well understood. To investigate the relative importance of plant traits in such interactions, we studied the role of the root hemiparasite, Castilleja levisecta (Orobanchaceae), as a mediator of interactions between the host plants it parasitizes and the lepidopteran herbivore Euphydryas editha (Nymphalidae), whose caterpillars feed on Castilleja and sequester iridoid glycosides from it...
November 13, 2017: Ecology
https://www.readbyqxmd.com/read/29129568/cutaneous-leishmaniasis-distinct-functions-of-dendritic-cells-and-macrophages-in-the-interaction-of-the-host-immune-system-with-leishmania-major
#10
REVIEW
Esther von Stebut, Stefan Tenzer
Leishmaniasis is transmitted by sand flies leading to parasite inoculation into skin. In the mammalian host, the parasite primarily resides in skin macrophages (MΦ) and dendritic cells (DC). MΦ are silently invaded by the parasite eliciting a stress response, whereas DC become activated, release IL-12, and prime antigen-specific T cells. Here we review the basics of the immune response against this human pathogen and elucidate the role and function DC and MΦ for establishment of protective immunity against leishmaniasis...
November 6, 2017: International Journal of Medical Microbiology: IJMM
https://www.readbyqxmd.com/read/29127992/leishmania-infantum-exerts-immunomodulation-in-canine-kupffer-cells-reverted-by-meglumine-antimoniate
#11
A Rodrigues, D Santos-Mateus, G Alexandre-Pires, A Valério-Bolas, M Rafael-Fernandes, M A Pereira, D Ligeiro, J de Jesus, R Alves-Azevedo, S Lopes-Ventura, M Santos, A M Tomás, I Pereira da Fonseca, G Santos-Gomes
Kupffer cells (KC) are the liver macrophage population that resides in the hepatic sinusoids and efficiently phagocyte pathogens by establishing an intimate contact with circulating blood. KC constitute the liver host cells in Leishmania infection, nevertheless little is described about their role, apart from their notable contribution in granulomatous inflammation. The present study aims to investigate how canine KC sense and react to the presence of Leishmania infantum promastigotes and amastigotes by evaluating the gene expression of specific innate immune cell receptors and cytokines, as well as the induction of nitric oxide and urea production...
December 2017: Comparative Immunology, Microbiology and Infectious Diseases
https://www.readbyqxmd.com/read/29125597/phage-mobility-is-a-core-determinant-of-phage-bacteria-coexistence-in-biofilms
#12
Matthew Simmons, Knut Drescher, Carey D Nadell, Vanni Bucci
Many bacteria are adapted for attaching to surfaces and for building complex communities, termed biofilms. The biofilm mode of life is predominant in bacterial ecology. So too is the exposure of bacteria to ubiquitous viral pathogens, termed bacteriophages. Although biofilm-phage encounters are likely to be common in nature, little is known about how phages might interact with biofilm-dwelling bacteria. It is also unclear how the ecological dynamics of phages and their hosts depend on the biological and physical properties of the biofilm environment...
November 10, 2017: ISME Journal
https://www.readbyqxmd.com/read/29122607/morphological-variation-in-the-cosmopolitan-fish-parasite-neobenedenia-girellae-capsalidae-monogenea
#13
Alexander K Brazenor, Richard J Saunders, Terrence L Miller, Kate S Hutson
Intra-species morphological variation presents a considerable problem for species identification and can result in taxonomic confusion. This is particularly pertinent for species of Neobenedenia which are harmful agents in captive fish populations and have historically been identified almost entirely based on morphological characters. This study aimed to understand how the morphology of Neobenedenia girellae varies with host fish species and the environment. Standard morphological features of genetically indistinct parasites from various host fish species were measured under controlled temperatures and salinities...
November 6, 2017: International Journal for Parasitology
https://www.readbyqxmd.com/read/29119655/targeting-host-mitochondria-a-role-for-the-trypanosoma-cruzi-amastigote-flagellum
#14
Gaelle Lentini, Nicolas Dos Santos Pacheco, Barbara A Burleigh
Trypanosoma cruzi is the kinetoplastid protozoan parasite that causes human Chagas disease, a chronic disease with complex outcomes including severe cardiomyopathy and sudden death. In mammalian hosts, T. cruzi colonizes a wide range of tissues and cell types where it replicates within the host cell cytoplasm. Like all intracellular pathogens, T. cruzi amastigotes must interact with its immediate host cell environment in a manner that facilitates access to nutrients and promotes a suitable niche for replication and survival...
November 8, 2017: Cellular Microbiology
https://www.readbyqxmd.com/read/29119101/effect-of-dual-infection-with-eimeria-tenella-and-subgroup-j-avian-leukosis-virus-on-the-cecal-microbiome-in-specific-pathogen-free-chicks
#15
Ning Cui, Xiuzhen Wang, Qi Wang, Hongmei Li, Fangkun Wang, Xiaomin Zhao
Understanding gut microflora alterations associated with gut parasites and other pathogens that drive these alterations may help to promote the understanding of intestinal flora's role in multiple-infected individuals. This study examined the effects of dual infection with Eimeria tenella and subgroup J avian leukosis virus (ALV-J) on the chick cecal microbiome. Specific-pathogen-free (SPF) chicks were infected with either ALV-J strain NX0101 at 1 day of age or E. tenella at 14 days of age, another group was infected with both pathogens...
2017: Frontiers in Veterinary Science
https://www.readbyqxmd.com/read/29116554/recent-advances-in-molecular-basis-for-strigolactone-action
#16
REVIEW
Ruifeng Yao, Jiayang Li, Daoxin Xie
Strigolactones (SLs) are a very special class of plant hormones, which act as endogenous signals to regulate shoot branching in plants, and also serve as rhizosphere signals to regulate interactions of host plants with heterologous organisms such as symbiotic arbuscular mycorrhizal fungi and parasitic weeds. In this short review, we give a brief description of novel discoveries in SL biosynthesis pathway, and mainly summarize the recent advances in SL perception and signal transduction.
November 6, 2017: Science China. Life Sciences
https://www.readbyqxmd.com/read/29114986/towards-an-eco-phylogenetic-framework-for-infectious-disease-ecology
#17
Nicholas M Fountain-Jones, William D Pearse, Luis E Escobar, Ana Alba-Casals, Scott Carver, T Jonathan Davies, Simona Kraberger, Monica Papeş, Kurt Vandegrift, Katherine Worsley-Tonks, Meggan E Craft
Identifying patterns and drivers of infectious disease dynamics across multiple scales is a fundamental challenge for modern science. There is growing awareness that it is necessary to incorporate multi-host and/or multi-parasite interactions to understand and predict current and future disease threats better, and new tools are needed to help address this task. Eco-phylogenetics (phylogenetic community ecology) provides one avenue for exploring multi-host multi-parasite systems, yet the incorporation of eco-phylogenetic concepts and methods into studies of host pathogen dynamics has lagged behind...
November 8, 2017: Biological Reviews of the Cambridge Philosophical Society
https://www.readbyqxmd.com/read/29114054/three-dimensional-visualization-and-a-deep-learning-model-reveal-complex-fungal-parasite-networks-in-behaviorally-manipulated-ants
#18
Maridel A Fredericksen, Yizhe Zhang, Missy L Hazen, Raquel G Loreto, Colleen A Mangold, Danny Z Chen, David P Hughes
Some microbes possess the ability to adaptively manipulate host behavior. To better understand how such microbial parasites control animal behavior, we examine the cell-level interactions between the species-specific fungal parasite Ophiocordyceps unilateralis sensu lato and its carpenter ant host (Camponotus castaneus) at a crucial moment in the parasite's lifecycle: when the manipulated host fixes itself permanently to a substrate by its mandibles. The fungus is known to secrete tissue-specific metabolites and cause changes in host gene expression as well as atrophy in the mandible muscles of its ant host, but it is unknown how the fungus coordinates these effects to manipulate its host's behavior...
November 7, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29111611/peptidase-inhibitors-in-tick-physiology
#19
REVIEW
L F Parizi, A Ali, L Tirloni, D P Oldiges, G A Sabadin, M L Coutinho, A Seixas, C Logullo, C Termignoni, I da Silva Vaz
Peptidase inhibitors regulate a wide range of physiological processes involved in the interaction between hematophagous parasites and their hosts, including tissue remodeling, the immune response and blood coagulation. In tick physiology, peptidase inhibitors have a crucial role in adaptation to improve parasitism mechanisms, facilitating blood feeding by interfering with defense-related host peptidases. Recently, a larger number of studies on this topic led to the description of several new tick inhibitors displaying interesting novel features, for example a role in pathogen transmission to the host...
November 7, 2017: Medical and Veterinary Entomology
https://www.readbyqxmd.com/read/29111599/experimental-investigation-of-alternative-transmission-functions-quantitative-evidence-for-the-importance-of-non-linear-transmission-dynamics-in-host-parasite-systems
#20
Sarah A Orlofske, Samuel M Flaxman, Maxwell B Joseph, Andy Fenton, Brett A Melbourne, Pieter T J Johnson
1.Understanding pathogen transmission is crucial for predicting and managing disease. Nonetheless, experimental comparisons of alternative functional forms of transmission remain rare, and those experiments that are conducted are often not designed to test the full range of possible forms. 2.To differentiate among ten candidate transmission functions, we used a novel experimental design in which we independently varied four factors-duration of exposure, numbers of parasites, numbers of hosts, and parasite density-in laboratory infection experiments...
November 7, 2017: Journal of Animal Ecology
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