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Host factors and malaria

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https://www.readbyqxmd.com/read/28526861/shedding-of-host-autophagic-proteins-from-the-parasitophorous-vacuolar-membrane-of-plasmodium-berghei
#1
Carolina Agop-Nersesian, Mariana De Niz, Livia Niklaus, Monica Prado, Nina Eickel, Volker T Heussler
The hepatic stage of the malaria parasite Plasmodium is accompanied by an autophagy-mediated host response directly targeting the parasitophorous vacuolar membrane (PVM) harbouring the parasite. Removal of the PVM-associated autophagic proteins such as ubiquitin, p62, and LC3 correlates with parasite survival. Yet, it is unclear how Plasmodium avoids the deleterious effects of selective autophagy. Here we show that parasites trap host autophagic factors in the tubovesicular network (TVN), an expansion of the PVM into the host cytoplasm...
May 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28525314/malaria-parasite-limp-protein-regulates-sporozoite-gliding-motility-and-infectivity-in-mosquito-and-mammalian-hosts
#2
Jorge M Santos, Saskia Egarter, Vanessa Zuzarte-Luís, Hirdesh Kumar, Catherine A Moreau, Jessica Kehrer, Andreia Pinto, Mário da Costa, Blandine Franke-Fayard, Chris J Janse, Friedrich Frischknecht, Gunnar R Mair
Gliding motility allows malaria parasites to migrate and invade tissues and cells in different hosts. It requires parasite surface proteins to provide attachment to host cells and extracellular matrices. Here, we identify the Plasmodium protein LIMP (the name refers to a gliding phenotype in the sporozoite arising from epitope tagging of the endogenous protein) as a key regulator for adhesion during gliding motility in the rodent malaria model P. berghei. Transcribed in gametocytes, LIMP is translated in the ookinete from maternal mRNA, and later in the sporozoite...
May 2, 2017: ELife
https://www.readbyqxmd.com/read/28506360/plasmodium-p36-determines-host-cell-receptor-usage-during-sporozoite-invasion
#3
Giulia Manzoni, Carine Marinach, Selma Topçu, Sylvie Briquet, Morgane Grand, Matthieu Tolle, Marion Gransagne, Julien Lescar, Chiara Andolina, Jean-François Franetich, Mirjam B Zeisel, Thierry Huby, Eric Rubinstein, Georges Snounou, Dominique Mazier, François Nosten, Thomas F Baumert, Olivier Silvie
Plasmodium sporozoites, the mosquito-transmitted forms of the malaria parasite, first infect the liver for an initial round of replication before the emergence of pathogenic blood stages. Sporozoites represent attractive targets for antimalarial preventive strategies, yet the mechanisms of parasite entry into hepatocytes remain poorly understood. Here we show that the two main species causing malaria in humans, Plasmodium falciparum and Plasmodium vivax, rely on two distinct host cell surface proteins, CD81 and the Scavenger Receptor BI (SR-BI), respectively, to infect hepatocytes...
May 16, 2017: ELife
https://www.readbyqxmd.com/read/28493919/genomic-variation-in-plasmodium-vivax-malaria-reveals-regions-under-selective-pressure
#4
Ernest Diez Benavente, Zoe Ward, Wilson Chan, Fady R Mohareb, Colin J Sutherland, Cally Roper, Susana Campino, Taane G Clark
BACKGROUND: Although Plasmodium vivax contributes to almost half of all malaria cases outside Africa, it has been relatively neglected compared to the more deadly P. falciparum. It is known that P. vivax populations possess high genetic diversity, differing geographically potentially due to different vector species, host genetics and environmental factors. RESULTS: We analysed the high-quality genomic data for 46 P. vivax isolates spanning 10 countries across 4 continents...
2017: PloS One
https://www.readbyqxmd.com/read/28427357/haplotype-of-non-synonymous-mutations-within-il-23r-is-associated-with-susceptibility-to-severe-malaria-anemia-in-a-p-falciparum-holoendemic-transmission-area-of-kenya
#5
Elly O Munde, Evans Raballah, Winnie A Okeyo, John M Ong'echa, Douglas J Perkins, Collins Ouma
BACKGROUND: Improved understanding of the molecular mechanisms involved in pediatric severe malarial anemia (SMA) pathogenesis is a crucial step in the design of novel therapeutics. Identification of host genetic susceptibility factors in immune regulatory genes offers an important tool for deciphering malaria pathogenesis. The IL-23/IL-17 immune pathway is important for both immunity and erythropoiesis via its effects through IL-23 receptors (IL-23R). However, the impact of IL-23R variants on SMA has not been fully elucidated...
April 20, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28426114/infectious-diseases-and-migrant-worker-health-in-singapore-a-receiving-country-s-perspective
#6
Sapna P Sadarangani, Poh Lian Lim, Shawn Vasoo
Background.: Approximately 1.4 million migrant workers reside in Singapore, presenting unique infectious disease challenges to both migrants and Singapore. Methods.: A Pubmed, MEDLINE (Ovid), EBSCO Host (Global Health) and Google Scholar search was performed for both peer, non-peer reviewed articles and reports relevant to migrant health in Singapore, published between 1 January 1989 and 1 September 2016. Additional studies were identified from citations within searched articles...
July 1, 2017: Journal of Travel Medicine
https://www.readbyqxmd.com/read/28410415/influence-of-host-factors-and-parasite-biomass-on-the-severity-of-imported-plasmodium-falciparum-malaria
#7
Nicolas Argy, Eric Kendjo, Claire Augé-Courtoi, Sandrine Cojean, Jérôme Clain, Pascal Houzé, Marc Thellier, Veronique Hubert, Philippe Deloron, Sandrine Houzé
OBJECTIVES: Imported malaria in France is characterized by various clinical manifestations observed in a heterogeneous population of patients such as travelers/expatriates and African migrants. In this population, host factors and parasite biomass associated with severe imported malaria are poorly known. METHODS: From data collected by the Centre National de Référence du Paludisme, we identified epidemiological, demographic and biological features including parasite biomass and anti-plasmodial antibody levels (negative, positive and strongly positive serology) associated with different disease severity groups (very severe, moderately severe, and uncomplicated malaria) in 3 epidemiological groups (travelers/expatriates, first- and second-generation migrants)...
2017: PloS One
https://www.readbyqxmd.com/read/28369062/t-cell-subtypes-and-reciprocal-inflammatory-mediator-expression-differentiate-p-falciparum-memory-recall-responses-in-asymptomatic-and-symptomatic-malaria-patients-in-southeastern-haiti
#8
Jason S Lehmann, Joseph J Campo, Micheline Cicéron, Christian P Raccurt, Jacques Boncy, Valery E M Beau De Rochars, Anthony P Cannella
Asymptomatic Plasmodium falciparum infection is responsible for maintaining malarial disease within human populations in low transmission countries such as Haiti. Investigating differential host immune responses to the parasite as a potential underlying mechanism could help provide insight into this highly complex phenomenon and possibly identify asymptomatic individuals. We performed a cross-sectional analysis of individuals who were diagnosed with malaria in Sud-Est, Haiti by comparing the cellular and humoral responses of both symptomatic and asymptomatic subjects...
2017: PloS One
https://www.readbyqxmd.com/read/28357358/translational-repression-in-malaria-sporozoites
#9
COMMENT
Oliver Turque, Tiffany Tsao, Thomas Li, Min Zhang
Malaria is a mosquito-borne infectious disease of humans and other animals. It is caused by the parasitic protozoan, Plasmodium. Sporozoites, the infectious form of malaria parasites, are quiescent when they remain in the salivary glands of the Anopheles mosquito until transmission into a mammalian host. Metamorphosis of the dormant sporozoite to its active form in the liver stage requires transcriptional and translational regulations. Here, we summarize recent advances in the translational repression of gene expression in the malaria sporozoite...
April 5, 2016: Microbial Cell
https://www.readbyqxmd.com/read/28353409/what-do-we-know-about-the-role-of-regulatory-b-cells-breg-during-the-course-of-infection-of-two-major-parasitic-diseases-malaria-and-leishmaniasis
#10
Roberta Reis Soares, Luciana Maria Ribeiro Antinarelli, Clarice Abramo, Gilson Costa Macedo, Elaine Soares Coimbra, Kézia Katiani Gorza Scopel
Parasitic diseases, such as malaria and leishmaniasis, are relevant public health problems worldwide. For both diseases, the alarming number of clinical cases and deaths reported annually has justified the incentives directed to better understanding of host's factors associated with susceptibility to infection or protection. In this context, over recent years, some studies have given special attention to B lymphocytes with a regulator phenotype, known as Breg cells. Essentially important in the maintenance of immunological tolerance, especially in autoimmune disease models such as rheumatoid arthritis and experimentally induced autoimmune encephalomyelitis, the function of these lymphocytes has so far been poorly explored during the course of diseases caused by parasites...
March 29, 2017: Pathogens and Global Health
https://www.readbyqxmd.com/read/28352049/association-of-cd40l-gene-polymorphism-with-severe-plasmodium-falciparum-malaria-in-indian-population
#11
Prasanta Purohit, Pradeep Kumar Mohanty, Siris Patel, Padmalaya Das, Kishalaya Das, Jogeswar Panigrahi
BACKGROUND & OBJECTIVES: Many host genetic factors are associated with the disease severity and fatal outcome of falciparum malaria. CD40L gene has been found to be one of the most important factors associated with malaria in African countries. This study was aimed to investigate the possible association of CD40L gene polymorphism in severe falciparum malaria in Indian adults. METHODS: One hundred fifteen adult cases with severe falciparum malaria were included in the study...
January 2017: Journal of Vector Borne Diseases
https://www.readbyqxmd.com/read/28336218/malaria-altering-host-attractiveness-and-mosquito-feeding
#12
Lauren Cator
Several studies have suggested that malaria parasites stack the odds of transmission in their favour by manipulating the attraction profiles of their hosts. A recent study provides evidence that a specific parasite factor, (E)-4-hydroxy-3-methyl-but-2-enyl pyrophosphate, may increase both the attractiveness of infected vertebrates and the susceptibility of mosquitoes to infection.
May 2017: Trends in Parasitology
https://www.readbyqxmd.com/read/28322872/plasmodium-hsp40-and-human-hsp70-a-potential-cochaperone-chaperone-complex
#13
Payal Jha, Shyamasree Laskar, Swati Dubey, Mrinal K Bhattacharyya, Sunanda Bhattacharyya
Out of the total forty four members of Plasmodium falciparum Hsp40 protein family, nineteen of them possess a PEXEL motif, and are predicted to be exported into the cytosol of an infected RBC. It is speculated that the human Hsp70 (hHsp70), which resides into the cytosol of the host erythrocyte, along with the exported PfHsp40s assists in the folding of parasitic proteins, thus playing a crucial role in the establishment of virulence. However, till date no experimental evidence supports this hypothesis. Our work establishes that the PEXEL motifs containing Type II PfDNAJ proteins specifically interact with hHsp70 (HSPA1A)...
March 18, 2017: Molecular and Biochemical Parasitology
https://www.readbyqxmd.com/read/28242785/malaria-parasite-liver-infection-and-exoerythrocytic-biology
#14
Ashley M Vaughan, Stefan H I Kappe
In their infection cycle, malaria parasites undergo replication and population expansions within the vertebrate host and the mosquito vector. Host infection initiates with sporozoite invasion of hepatocytes, followed by a dramatic parasite amplification event during liver stage parasite growth and replication within hepatocytes. Each liver stage forms up to 90,000 exoerythrocytic merozoites, which are in turn capable of initiating a blood stage infection. Liver stages not only exploit host hepatocyte resources for nutritional needs but also endeavor to prevent hepatocyte cell death and detection by the host's immune system...
February 27, 2017: Cold Spring Harbor Perspectives in Medicine
https://www.readbyqxmd.com/read/28231248/intensive-trapping-of-blood-fed-anopheles-darlingi-in-amazonian-peru-reveals-unexpectedly-high-proportions-of-avian-blood-meals
#15
Marta Moreno, Marlon P Saavedra, Sara A Bickersmith, Catharine Prussing, Adrian Michalski, Carlos Tong Rios, Joseph M Vinetz, Jan E Conn
Anopheles darlingi, the main malaria vector in the Neotropics, has been considered to be highly anthropophilic. However, many behavioral aspects of this species remain unknown, such as the range of blood-meal sources. Barrier screens were used to collect resting Anopheles darlingi mosquitoes from 2013 to 2015 in three riverine localities (Lupuna, Cahuide and Santa Emilia) in Amazonian Peru. Overall, the Human Blood Index (HBI) ranged from 0.58-0.87, with no significant variation among years or sites. Blood-meal analysis revealed that humans are the most common blood source, followed by avian hosts (Galliformes-chickens and turkeys), and human/Galliforme mixed-meals...
February 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28220125/hgf-secreted-by-activated-kupffer-cells-induces-apoptosis-of-plasmodium-infected-hepatocytes
#16
Lígia Antunes Gonçalves, Joana Rodo, Lurdes Rodrigues-Duarte, Luciana Vieira de Moraes, Carlos Penha-Gonçalves
Malaria liver stage infection is an obligatory parasite development step and represents a population bottleneck in Plasmodium infections, providing an advantageous target for blocking parasite cycle progression. Parasite development inside hepatocytes implies a gross cellular insult evoking innate host responses to counteract intra-hepatocytic infection. Using primary hepatocyte cultures, we investigated the role of Kupffer cell-derived hepatocyte growth factor (HGF) in malaria liver stage infection. We found that Kupffer cells from Plasmodium-infected livers produced high levels of HGF, which trigger apoptosis of infected hepatocytes through a mitochondrial-independent apoptosis pathway...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28219387/geographical-distributions-of-african-malaria-vector-sibling-species-and-evidence-for-insecticide-resistance
#17
Antoinette Wiebe, Joshua Longbottom, Katherine Gleave, Freya M Shearer, Marianne E Sinka, N Claire Massey, Ewan Cameron, Samir Bhatt, Peter W Gething, Janet Hemingway, David L Smith, Michael Coleman, Catherine L Moyes
BACKGROUND: Many of the mosquito species responsible for malaria transmission belong to a sibling complex; a taxonomic group of morphologically identical, closely related species. Sibling species often differ in several important factors that have the potential to impact malaria control, including their geographical distribution, resistance to insecticides, biting and resting locations, and host preference. The aim of this study was to define the geographical distributions of dominant malaria vector sibling species in Africa so these distributions can be coupled with data on key factors such as insecticide resistance to aid more focussed, species-selective vector control...
February 20, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28203236/the-deubiquitinating-enzyme-cylindromatosis-dampens-cd8-t-cell-responses-and-is-a-critical-factor-for-experimental-cerebral-malaria-and-blood-brain-barrier-damage
#18
Ursula Schmid, Werner Stenzel, Josephin Koschel, Maria Raptaki, Xu Wang, Michael Naumann, Kai Matuschewski, Dirk Schlüter, Gopala Nishanth
Cerebral malaria is a severe complication of human malaria and may lead to death of Plasmodium falciparum-infected individuals. Cerebral malaria is associated with sequestration of parasitized red blood cells within the cerebral microvasculature resulting in damage of the blood-brain barrier and brain pathology. Although CD8(+) T cells have been implicated in the development of murine experimental cerebral malaria (ECM), several other studies have shown that CD8(+) T cells confer protection against blood-stage infections...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28183301/cellulose-filtration-of-blood-from-malaria-patients-for-improving-ex-vivo-growth-of-plasmodium-falciparum-parasites
#19
Sixbert I Mkumbaye, Daniel T R Minja, Jakob S Jespersen, Michael Alifrangis, Reginald A Kavishe, Steven B Mwakalinga, John P Lusingu, Thor G Theander, Thomas Lavstsen, Christian W Wang
BACKGROUND: Establishing in vitro Plasmodium falciparum culture lines from patient parasite isolates can offer deeper understanding of geographic variations of drug sensitivity and mechanisms of malaria pathogenesis and immunity. Cellulose column filtration of blood is an inexpensive, rapid and effective method for the removal of host factors, such as leucocytes and platelets, significantly improving the purification of parasite DNA in a blood sample. METHODS: In this study, the effect of cellulose column filtration of venous blood on the initial in vitro growth of P...
February 10, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28158202/high-plasmodium-falciparum-longitudinal-prevalence-is-associated-with-high-multiclonality-and-reduced-clinical-malaria-risk-in-a-seasonal-transmission-area-of-mali
#20
Yaw Adomako-Ankomah, Matthew S Chenoweth, Katelyn Durfee, Saibou Doumbia, Drissa Konate, Mory Doumbouya, Abdoul S Keita, Daria Nikolaeva, Gregory S Tullo, Jennifer M Anderson, Rick M Fairhurst, Rachel Daniels, Sarah K Volkman, Mahamadou Diakite, Kazutoyo Miura, Carole A Long
The effects of persistent Plasmodium falciparum (Pf) infection and multiclonality on subsequent risk of clinical malaria have been reported, but the relationship between these 2 parameters and their relative impacts on the clinical outcome of infection are not understood. A longitudinal cohort study was conducted in a seasonal and high-transmission area of Mali, in which 500 subjects aged 1-65 years were followed for 1 year. Blood samples were collected every 2 weeks, and incident malaria cases were diagnosed and treated...
2017: PloS One
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