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https://www.readbyqxmd.com/read/29678115/characterization-of-plasmodium-falciparum-atypical-kinase-pfpk7-dependent-phosphoproteome
#1
Brittany N Pease, Edward L Huttlin, Mark P Jedrychowski, Dominique Dorin-Semblat, Daniela Sebastiani, Daniel T Segarra, Bracken F Roberts, Ratna Chakrabarti, Christian Doerig, Steven P Gygi, Debopam Chakrabarti
PfPK7 is an "orphan" kinase displaying regions of homology to multiple protein kinase families. PfPK7 functions in regulating parasite proliferation/development as evident from the phenotype analysis of knockout parasites. Despite this regulatory role, the functions of PfPK7 in signaling pathways are not known. To better understand PfPK7-regulated phosphorylation events, we performed isobaric tag-based quantitative comparative phosphoproteomics of the schizont and segmenter stages from wild-type and pfpk7- parasite lines...
April 20, 2018: Journal of Proteome Research
https://www.readbyqxmd.com/read/29677644/antimicrobial-activity-and-cytotoxicity-of-xanthoquinodin-analogs-from-the-fungus-cytospora-eugeniae-bcc42696
#2
Karoon Sadorn, Siriporn Saepua, Nattawut Boonyuen, Tanapong Boonruangprapa, Pranee Rachtawee, Pattama Pittayakhajonwut
Eleven previously undescribed compounds, including cytosporanthraxanthone, xanthoquinodins A7-A10, ketoxanthoquinodin A6, xanthoquinodins B6-B8, and spiroxanthoquinodins A and B, and one synthetically known compound, 2-methoxy pinselin, as well as ten known compounds, including xanthoquinodins A4-A6, B4, and B5, chrysophanol, physcion, (4S)-5-hydroxy-4-methoxy-α-tetralone, (4S)-4,8-dihydroxy-α-tetralone (or isosclerone), and gonytolide C were isolated from the fungus Cytospora eugeniae BCC42696. Their chemical structures were determined based on the analysis of NMR spectroscopic and mass spectrometric data...
April 17, 2018: Phytochemistry
https://www.readbyqxmd.com/read/29677637/the-prevalence-of-molecular-markers-of-drug-resistance-in-plasmodium-vivax-from-the-border-regions-of-thailand-in-2008-and-2014
#3
Kritpaphat Tantiamornkul, Tepanata Pumpaibool, Jittima Piriyapongsa, Richard Culleton, Usa Lek-Uthai
The prevalence of Plasmodium vivax is increasing in the border regions of Thailand; one potential problem confounding the control of malaria in these regions is the emergence and spread of drug resistance. The aim of this study was to determine the genetic diversity in genes potentially linked to drug resistance in P. vivax parasites isolated from four different border regions of Thailand; Thai-Myanmar (Tak, Mae Hong Son and Prachuap Khiri Khan Provinces), and Thai-Cambodian borders (Chanthaburi Province). Isolates were collected from 345 P...
April 12, 2018: International Journal for Parasitology, Drugs and Drug Resistance
https://www.readbyqxmd.com/read/29676250/plasmodium-falciparum-resistance-to-artemisinin-based-combination-therapies-a-sword-of-damocles-in-the-path-toward-malaria-elimination
#4
Manel Ouji, Jean-Michel Augereau, Lucie Paloque, Françoise Benoit-Vical
The use of artemisinin-based combination therapies (ACTs), which combine an artemisinin derivative with a partner drug, in the treatment of uncomplicated malaria has largely been responsible for the significant reduction in malaria-related mortality in tropical and subtropical regions. ACTs have also played a significant role in the 18% decline in the incidence of malaria cases from 2010 to 2016. However, this progress is seriously threatened by the reduced clinical efficacy of artemisinins, which is characterised by delayed parasitic clearance and a high rate of recrudescence, as reported in 2008 in Western Cambodia...
2018: Parasite: Journal de la Société Française de Parasitologie
https://www.readbyqxmd.com/read/29674705/children-with-cerebral-malaria-or-severe-malarial-anaemia-lack-immunity-to-distinct-variant-surface-antigen-subsets
#5
Mark A Travassos, Amadou Niangaly, Jason A Bailey, Amed Ouattara, Drissa Coulibaly, Kirsten E Lyke, Matthew B Laurens, Jozelyn Pablo, Algis Jasinskas, Rie Nakajima, Andrea A Berry, Matthew Adams, Christopher G Jacob, Andrew Pike, Shannon Takala-Harrison, Li Liang, Bourema Kouriba, Abdoulaye K Kone, J Alexandra Rowe, JoAnn Moulds, Dapa A Diallo, Ogobara K Doumbo, Mahamadou A Thera, Philip L Felgner, Christopher V Plowe
Variant surface antigens (VSAs) play a critical role in severe malaria pathogenesis. Defining gaps, or "lacunae", in immunity to these Plasmodium falciparum antigens in children with severe malaria would improve our understanding of vulnerability to severe malaria and how protective immunity develops. Using a protein microarray with 179 antigen variants from three VSA families as well as more than 300 variants of three other blood stage P. falciparum antigens, reactivity was measured in sera from Malian children with cerebral malaria or severe malarial anaemia and age-matched controls...
April 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29674030/molecularly-imprinted-polymer-for-determination-of-lumefantrine-in-human-plasma-through-chemometric-assisted-solid-phase-extraction-and-liquid-chromatography
#6
Pedro Henrique Reis da Silva, Melina Luiza Vieira Diniz, Gerson Antônio Pianetti, Isabela da Costa César, Maria Elisa Scarpelli Ribeiro E Silva, Roberto Fernando de Souza Freitas, Ricardo Geraldo de Sousa, Christian Fernandes
Lumefantrine is the first-choice treatment of Falciparum uncomplicated malaria. Recent findings of resistance to lumefantrine has brought attention for the importance of therapeutic monitoring, since exposure to subtherapeutic doses of antimalarials after administration is a major cause of selection of resistant parasites. Therefore, this study focused on the development of innovative, selective, less expensive and stable molecularly imprinted polymers (MIPs) for solid-phase extraction (SPE) of lumefantrine from human plasma to be used in drug monitoring...
July 1, 2018: Talanta
https://www.readbyqxmd.com/read/29673877/the-plasmodium-knowlesi-mahrp2-ortholog-localizes-to-structures-connecting-sinton-mulligan-s-clefts-in-the-infected-erythrocyte
#7
Kwame Kumi Asare, Miako Sakaguchi, Amuza Byaruhanga Lucky, Masahito Asada, Shinya Miyazaki, Yuko Katakai, Satoru Kawai, Chihong Song, Kazuyoshi Murata, Kazuhide Yahata, Osamu Kaneko
During development within the host erythrocyte malaria parasites generate nascent membranous structures which serve as a pathway for parasite protein transport to modify the host cell. The molecular basis of such membranous structures is not well understood, particularly for malaria parasites other than Plasmodium falciparum. To characterize the structural basis of protein trafficking in the Plasmodium knowlesi-infected erythrocyte, we identified a P. knowlesi ortholog of MAHRP2, a marker of the tether structure that connects membranous structures in the P...
April 16, 2018: Parasitology International
https://www.readbyqxmd.com/read/29672516/use-of-primaquine-and-glucose-6-phosphate-dehydrogenase-deficiency-testing-divergent-policies-and-practices-in-malaria-endemic-countries
#8
REVIEW
Judith Recht, Elizabeth A Ashley, Nicholas J White
Primaquine is the only available antimalarial drug that kills dormant liver stages of Plasmodium vivax and Plasmodium ovale malarias and therefore prevents their relapse ('radical cure'). It is also the only generally available antimalarial that rapidly sterilises mature P. falciparum gametocytes. Radical cure requires extended courses of primaquine (usually 14 days; total dose 3.5-7 mg/kg), whereas transmissibility reduction in falciparum malaria requires a single dose (formerly 0.75 mg/kg, now a single low dose [SLD] of 0...
April 2018: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/29670745/induction-of-immunity-following-vaccination-with-a-chemically-attenuated-malaria-vaccine-correlates-with-persistent-antigenic-stimulation
#9
Jennifer M Reiman, Sanjai Kumar, Ingrid B Rodriguez, Sedami Gnidehou, Koichi Ito, Danielle I Stanisic, Moses Lee, Virginia McPhun, Victoria Majam, Nicole M Willemsen, Michael R Batzloff, Amber I Raja, Brad Dooley, Stephen L Hoffman, Stephanie K Yanow, Michael F Good
Objectives: Blood stage malaria parasites attenuated with seco-cyclopropyl pyrrolo indole (CPI) analogues induce robust immunity in mice to homologous and heterologous malaria parasites and are being considered for the development of a human vaccine. However, it is not understood how attenuated parasites induce immunity. We showed that following vaccination, parasite DNA persisted in blood for several months, raising the possibility that ongoing immune stimulation may be critical. However, parasites were not seen microscopically beyond 24 h postvaccination...
2018: Clinical & Translational Immunology
https://www.readbyqxmd.com/read/29670144/chromobacterium-spp-mediate-their-anti-plasmodium-activity-through-secretion-of-the-histone-deacetylase-inhibitor-romidepsin
#10
Raúl G Saraiva, Callie R Huitt-Roehl, Abhai Tripathi, Yi-Qiang Cheng, Jürgen Bosch, Craig A Townsend, George Dimopoulos
The Chromobacterium sp. Panama bacterium has in vivo and in vitro anti-Plasmodium properties. To assess the nature of the Chromobacterium-produced anti-Plasmodium factors, chemical partition was conducted by bioassay-guided fractionation where different fractions were assayed for activity against asexual stages of P. falciparum. The isolated compounds were further partitioned by reversed-phase FPLC followed by size-exclusion chromatography; high resolution UPLC and ESI/MS data were then collected and revealed that the most active fraction contained a cyclic depsipeptide, which was identified as romidepsin...
April 18, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29669882/influential-parameters-for-the-analysis-of-intracellular-parasite-metabolomics
#11
Maureen A Carey, Vincent Covelli, Audrey Brown, Gregory L Medlock, Mareike Haaren, Jessica G Cooper, Jason A Papin, Jennifer L Guler
Metabolomics is increasingly popular for the study of pathogens. For the malaria parasite Plasmodium falciparum , both targeted and untargeted metabolomics have improved our understanding of pathogenesis, host-parasite interactions, and antimalarial drug treatment and resistance. However, purification and analysis procedures for performing metabolomics on intracellular pathogens have not been explored. Here, we purified in vitro -grown ring-stage intraerythrocytic P. falciparum parasites for untargeted metabolomics studies; the small size of this developmental stage amplifies the challenges associated with metabolomics studies as the ratio between host and parasite biomass is maximized...
April 25, 2018: MSphere
https://www.readbyqxmd.com/read/29669580/the-bionomics-of-the-malaria-vector-anopheles-rufipes-gough-1910-and-its-susceptibility-to-deltamethrin-insecticide-in-north-cameroon
#12
Parfait H Awono-Ambene, Josiane Etang, Christophe Antonio-Nkondjio, Cyrille Ndo, Wolfgang Ekoko Eyisap, Michael C Piameu, Elysée S Mandeng, Ranaise L Mbakop, Jean Claude Toto, Salomon Patchoke, Abraham P Mnzava, Tessa B Knox, Martin Donnelly, Etienne Fondjo, Jude D Bigoga
BACKGROUND: Following the recent discovery of the role of Anopheles rufipes Gough, 1910 in human malaria transmission in the northern savannah of Cameroon, we report here additional information on its feeding and resting habits and its susceptibility to the pyrethroid insecticide deltamethrin. METHODS: From 2011 to 2015, mosquito samples were collected in 38 locations across Garoua, Mayo Oulo and Pitoa health districts in North Cameroon. Adult anophelines collected using outdoor clay pots, window exit traps and indoor spray catches were checked for feeding status, blood meal origin and Plasmodium circumsporozoite protein...
April 18, 2018: Parasites & Vectors
https://www.readbyqxmd.com/read/29666186/a-malaria-protein-factor-induces-il-4-production-by-dendritic-cells-via-pi3k-akt-nf-%C3%AE%C2%BAb-signaling-independent-of-myd88-trif-and-promotes-th2-response
#13
Xianzhu Wu, Nagaraj M Gowda, Yuka I Kawasawa, D Channe Gowda
Dendritic cells (DC) and cytokines produced by DC play crucial roles in inducing and regulating pro-/anti-inflammatory and Th1/Th2 responses. DC are known to produce Th1-promoting cytokine, IL-12, in response to malaria and other pathogenic infections, but it is thought that DC do not produce Th2-promoting cytokine, IL-4. Here, we show that a protein factor of malaria parasites induces IL-4 responses by CD11chi MHCIIhi CD3ε- CD49b- CD19- FcεRI- DC via PI3K-Akt-NF-κB signaling independent of TLR-MyD88/TRIF...
April 17, 2018: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29665803/plasmodium-vivax-and-plasmodium-falciparum-infection-dynamics-re-infections-recrudescences-and-relapses
#14
Michael T White, Stephan Karl, Cristian Koepfli, Rhea J Longley, Natalie E Hofmann, Rahel Wampfler, Ingrid Felger, Tom Smith, Wang Nguitragool, Jetsumon Sattabongkot, Leanne Robinson, Azra Ghani, Ivo Mueller
BACKGROUND: In malaria endemic populations, complex patterns of Plasmodium vivax and Plasmodium falciparum blood-stage infection dynamics may be observed. Genotyping samples from longitudinal cohort studies for merozoite surface protein (msp) variants increases the information available in the data, allowing multiple infecting parasite clones in a single individual to be identified. msp genotyped samples from two longitudinal cohorts in Papua New Guinea (PNG) and Thailand were analysed using a statistical model where the times of acquisition and clearance of each clone in every individual were estimated using a process of data augmentation...
April 17, 2018: Malaria Journal
https://www.readbyqxmd.com/read/29665687/identification-of-fast-acting-2-6-disubstituted-imidazopyridines-that-are-efficacious-in-the-in-vivo-humanized-plasmodium-falciparum-nodscidil2r%C3%AE-null-mouse-model-of-malaria
#15
Aloysius T Nchinda, Claire Le Manach, Tanya Paquet, Diego Gonzalez Cabrera, Kathryn J Wicht, Christel Brunschwig, Mathew Njoroge, Efrem Abay, Dale Taylor, Nina Lawrence, Sergio Wittlin, Maria-Belen Jimenez-Diaz, Maria Santos Martínez-Martínez, Santiago Ferrer, Iñigo Angulo-Barturen, Maria Jose Lafuente-Monasterio, James Duffy, Jeremy N Burrows, Leslie J Street, Kelly Chibale
Optimization of a chemical series originating from whole-cell phenotypic screening against the human malaria parasite, Plasmodium falciparum, led to the identification of two promising 2,6-disubstituted imidazopyridine compounds, 43 and 74. These compounds exhibited potent activity against asexual blood stage parasites that, together with their in vitro Absorption, Distribution, Metabolism, and Excretion (ADME) properties, translated to in vivo efficacy with clearance of parasites in the PfSCID mouse model for malaria within 48 h of treatment...
April 17, 2018: Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29664138/characterization-of-the-catalytic-subunits-of-the-rna-exosome-like-complex-in-plasmodium-falciparum
#16
Ning Jiang, Shengchao Yu, Na Yang, Ying Feng, Xiaoyu Sang, Yao Wang, Mats Wahlgren, Qijun Chen
The eukaryotic ribonucleic acid (RNA) exosome is a versatile multi-ribonuclease complex that mediates the processing, surveillance and degradation of virtually all classes of RNA in both the nucleus and cytoplasm. The complex, composed of ten to eleven subunits, has been widely described in many organisms. Bioinformatic analyses revealed that there may be also an exosome-like complex in Plasmodium falciparum, a parasite of great importance in public health, with eight predicted subunits having high sequence similarity to their counterparts in yeast and human...
April 17, 2018: Journal of Eukaryotic Microbiology
https://www.readbyqxmd.com/read/29661235/presence-of-novel-triple-mutations-in-the-pvdhfr-from-plasmodium-vivax-in-mangaluru-city-area-in-the-southwestern-coastal-region-of-india
#17
Shiny Joy, Susanta K Ghosh, Rajeshwara N Achur, D Channe Gowda, Namita Surolia
BACKGROUND: Genes encoding dihydrofolate reductase (dhfr) and dihydropteroate synthase (dhps) are the targets of sulfadoxine-pyrimethamine (SP) present in artemisinin based combination therapy (ACT; artesunate + sulfadoxine pyrimethamine) for Plasmodium falciparum. Although SP is generally not used to treat vivax infection, mutations in dhfr and dhps that confer antifolate resistance in Plasmodium vivax are common; which may be attributed to its sympatric existence with P. falciparum...
April 16, 2018: Malaria Journal
https://www.readbyqxmd.com/read/29660103/submicroscopic-plasmodium-falciparum-parasitaemia-in-human-immunodeficiency-virus-infected-adults-living-in-gabon-central-africa-a-pilot-study
#18
J V Koumba Lengongo, N P M'Bondoukwé, J M Ndong Ngomo, S François, A Ndjoyi-Mbiguino, O A Mbang Nguema, M K Bouyou Akotet, D P Mawili-Mboumba
Background: Submicroscopic malaria infections contribute to malaria transmission. Describing the extent of the parasite reservoir is of importance. In people living with human immunodeficiency virus (HIV), the frequency of subpatent malaria infections is rarely reported. The aim of the present study was to determine the frequency of submicroscopic infections in people living with HIV in Gabon and its relationship with cotrimoxazole (CTX) use. Methods: A survey was conducted in two health care centres in rural areas (Koulamoutou and Oyem) and three in urban areas (Libreville) of Gabon from March 2015 to June 2016...
April 5, 2018: Transactions of the Royal Society of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/29659945/plasmodium-falciparum-falcipain-2a-polymorphisms-in-southeast-asia-and-their-association-with-artemisinin-resistance
#19
Faiza A Siddiqui, Mynthia Cabrera, Meilian Wang, Awtum Brashear, Karen Kemirembe, Zenglei Wang, Jun Miao, Thanat Chookajorn, Zhaoqing Yang, Yaming Cao, Gang Dong, Philip J Rosenthal, Liwang Cui
Falcipain-2a (FP2a; PF3D7_1115700) is a Plasmodium falciparum cysteine protease and hemoglobinase. Functional FP2a is required for potent activity of artemisinin, and in vitro selection for artemisinin resistance selected for an FP2a nonsense mutation. To investigate associations between FP2a polymorphisms and artemisinin resistance and to characterize the diversity of the enzyme in parasites from the China-Myanmar border, we sequenced the full-length FP2a gene in 140 P. falciparum isolates collected during 2004-2011...
April 12, 2018: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/29659897/additional-screening-and-treatment-of-malaria-during-pregnancy-provides-further-protection-against-malaria-and-nonmalarial-fevers-during-the-first-year-of-life
#20
Hamtandi Magloire Natama, Eduard Rovira-Vallbona, Hermann Sorgho, M Athanase Somé, Maminata Traoré-Coulibaly, Susana Scott, Serge Henri Zango, Ousséni Sawadogo, Sibiri Claude Zongo, Innocent Valéa, Petra F Mens, Henk D F H Schallig, Luc Kestens, Halidou Tinto, Anna Rosanas-Urgell
Background: Although consensus exists that malaria in pregnancy (MiP) increases the risk of malaria in infancy, and eventually nonmalarial fevers (NMFs), there is a lack of conclusive evidence of benefits of MiP preventive strategies in infants. Methods: In Burkina Faso, a birth cohort study was nested to a clinical trial assessing the effectiveness of a community-based scheduled screening and treatment of malaria in combination with intermittent preventive treatment with sulfadoxine-pyrimethamine (CSST/IPTp-SP) to prevent placental malaria...
March 15, 2018: Journal of Infectious Diseases
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