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https://www.readbyqxmd.com/read/29155671/capacity-development-through-the-us-president-s-malaria-initiative-supported-antimalarial-resistance-monitoring-in-africa-network
#1
Eric S Halsey, Meera Venkatesan, Mateusz M Plucinski, Eldin Talundzic, Naomi W Lucchi, Zhiyong Zhou, Celine I Mandara, Hawela Moonga, Busiku Hamainza, Abdoul Habib Beavogui, Simon Kariuki, Aaron M Samuels, Laura C Steinhardt, Don P Mathanga, Julie Gutman, Yves Eric Denon, Aline Uwimana, Ashenafi Assefa, Jimee Hwang, Ya Ping Shi, Pedro Rafael Dimbu, Ousmane Koita, Deus S Ishengoma, Daouda Ndiaye, Venkatachalam Udhayakumar
Antimalarial drug resistance is an evolving global health security threat to malaria control. Early detection of Plasmodium falciparum resistance through therapeutic efficacy studies and associated genetic analyses may facilitate timely implementation of intervention strategies. The US President's Malaria Initiative-supported Antimalarial Resistance Monitoring in Africa Network has assisted numerous laboratories in partner countries in acquiring the knowledge and capability to independently monitor for molecular markers of antimalarial drug resistance...
December 2017: Emerging Infectious Diseases
https://www.readbyqxmd.com/read/29155505/phistc-protein-family-members-localize-to-different-sub-cellular-organelles-and-bind-plasmodium-falciparum-major-virulence-factor-pfemp-1
#2
Vikash Kumar, Jasweer Kaur, Amrit Pal Singh, Vineeta Singh, Anjali Bisht, Jiban Jyoti Panda, Prakash Chandra Mishra, Rachna Hora
Plasmodium falciparum (Pf) encodes a novel repertoire of exported protein family called as Plasmodium helical interspersed sub-telomeric (PHIST) that plays diverse roles in infected red blood cells (iRBCs), contributing to malaria pathogenesis. PHIST proteins are central to parasite biology, and modify human erythrocytes by executing interactions with parasite and host proteins. Here, we have attempted to understand the localization and function of two unexplored proteins of PHISTc sub-family 'PFD1140w and PF11_0503', and compared our findings with a well characterized member 'PFI1780w'...
November 20, 2017: FEBS Journal
https://www.readbyqxmd.com/read/29154995/a-map-of-the-subcellular-distribution-of-phosphoinositides-in-the-erythrocytic-cycle-of-the-malaria-parasite-plasmodium-falciparum
#3
Zeinab Ebrahimzadeh, Angana Mukherjee, Dave Richard
Despite representing a small percentage of the cellular lipids of eukaryotic cells, phosphoinositides (PIPs) are critical in various processes such as intracellular trafficking and signal transduction. Central to their various functions is the differential distribution of PIP species to specific membrane compartments through the actions of kinases, phosphatases and lipases. Despite their importance in the malaria parasite lifecycle, the subcellular distribution of most PIP species in this organism is still unknown...
November 15, 2017: International Journal for Parasitology
https://www.readbyqxmd.com/read/29153587/advancing-research-models-and-technologies-to-overcome-biological-barriers-to-plasmodium-vivax-control
#4
REVIEW
Jennifer S Armistead, John H Adams
Malaria prevalence has declined in the past 10 years, especially outside of sub-Saharan Africa. However, the proportion of cases due to Plasmodium vivax is increasing, accounting for up to 90-100% of the malaria burden in endemic regions. Nonetheless, investments in malaria research and control still prioritize Plasmodium falciparum while largely neglecting P. vivax. Specific biological features of P. vivax, particularly invasion of reticulocytes, occurrence of dormant liver forms of the parasite, and the potential for transmission of sexual-stage parasites prior to onset of clinical illness, promote its persistence and hinder development of research tools and interventions...
November 16, 2017: Trends in Parasitology
https://www.readbyqxmd.com/read/29153070/-the-importance-of-the-contribution-of-rapid-test-serological-and-molecular-methods-in-the-diagnosis-of-two-imported-malaria-cases-with-atypical-microscopy
#5
Orçun Zorbozan, Hüsnü Pullukçu, Esra Atalay Şahar, Muhammet Karakavuk, Hüseyin Can, Varol Tunali, Mert Döşkaya, Nevin Turgay, Seray Töz, Ahmet Özbilgin
Malaria is a widespread and life-threatening disease in tropical and subtropical regions. In patients with typical clinical symptoms, malaria is considered as a preliminary diagnosis if there is a travel history to malaria-endemic areas. The basis of the laboratory diagnosis of malaria is the microscopic examination of Giemsa stained smears. On the other hand, the diagnosis and differentiation of Plasmodium species with microscopic examination may have some difficulties. In the first case, adifferent appearance from the classical Plasmodium vivax erythrocytic forms in infected erythrocytes were detected in 1% of all erythrocytes in thin smear blood preparations of a 26-year-old male with complaints of fever and chills and a story of travel to Nigeria...
October 2017: Mikrobiyoloji Bülteni
https://www.readbyqxmd.com/read/29151351/immucillins-in-infectious-diseases
#6
Gary B Evans, Peter C Tyler, Vern L Schramm
Transition state theory proposes that stable chemical mimics of enzymatic transition states will be powerful inhibitors of their cognate enzymes. The Immucillins are chemically stable analogues that mimic the ribocation and leaving-group features of N-ribosyltransferase transition states. Infectious disease agents often rely on ribosyltransferase chemistry in pathways involving precursor synthesis for nucleic acids, salvage of nucleic acid precursors from the host or synthetic pathways with nucleoside intermediates...
November 19, 2017: ACS Infectious Diseases
https://www.readbyqxmd.com/read/29150282/artesunate-quercetin-luteolin-dual-drug-nanofacilitated-synergistic-treatment-for-malaria-a-plausible-approach-to-overcome-artemisinin-combination-therapy-resistance
#7
Nethravathi Puttappa, Raman Suresh Kumar, Karthik Yamjala
Malaria is one of the major global health challenge with 300 million new cases annually. The best regimen for treating Plasmodium falciparum induced malaria is based on artemisinin and its derivatives which were prescribed as artemisinin combination therapy (ACT). These are highly effective drugs resulting in rapid clearance of parasites even in severe P. falciparum induced malaria patients. However, from the past few years parasites resistant to ACT's have begun to emerge in various parts of the world such as Cambodia and Greater Mekong Subregion...
November 2017: Medical Hypotheses
https://www.readbyqxmd.com/read/29149898/detection-of-plasmodium-falciparum-male-and-female-gametocytes-and-determination-of-parasite-sex-ratio-in-human-endemic-populations-by-novel-cheap-and-robust-rtqpcr-assays
#8
Federica Santolamazza, Pamela Avellino, Giulia Siciliano, Franck Adama Yao, Fabrizio Lombardo, Jean Bosco Ouédraogo, David Modiano, Pietro Alano, Valentina Dianora Mangano
BACKGROUND: The presence of Plasmodium falciparum gametocytes in peripheral blood is essential for human to mosquito parasite transmission. The detection of submicroscopic infections with gametocytes and the estimation of the gametocyte sex ratio are crucial to assess the human host potential ability to infect mosquitoes and transmit malaria parasites. AIM AND OBJECTIVES: The aim of this work was to develop sensitive and cheap Real Time qPCR assays for large-scale epidemiological surveys, based on detection and amplification of gametocyte sex specific transcripts selected from the literature: the female-specific pfs25 and pf glycerol kinase (pfGK) and the male-specific pfs230p and pf13 transcripts...
November 17, 2017: Malaria Journal
https://www.readbyqxmd.com/read/29148157/novel-ws9326a-derivatives-and-one-novel-annimycin-derivative-with-antimalarial-activity-are-produced-by-streptomyces-asterosporus-dsm-41452-and-its-mutant
#9
Andreas Bechthold, Songya Zhang, Jing Zhu, David Zechel, Claudia Jessen-Trefzer, Richard T Eastman, Thomas Paululat
In this study we report that Streptomyces asterosporus DSM 41452 is a producer of new molecules related to the non-ribosomal cyclodepsipeptide WS9326A and the polyketide Annimycin. S. asterosporus DSM 41452 is shown to produce six cyclodepsipeptides and peptides, WS9326A to G. Notably, the compounds WS9326F and WS9326G have not been de-scribed before. The genome of S. asterosporus DSM 41452 was sequenced and a putative WS9326A gene cluster was iden-tified. Gene deletion experiments confirmed that this cluster is responsible for the biosynthesis of WS9326A to G...
November 17, 2017: Chembiochem: a European Journal of Chemical Biology
https://www.readbyqxmd.com/read/29147042/insecticide-treated-nets-and-malaria-prevalence-papua-new-guinea-2008-2014
#10
Manuel W Hetzel, Justin Pulford, Yangta Ura, Sharon Jamea-Maiasa, Anthony Tandrapah, Nandao Tarongka, Lina Lorry, Leanne J Robinson, Ken Lilley, Leo Makita, Peter M Siba, Ivo Mueller
Objective: To investigate changes in malaria prevalence in Papua New Guinea after the distribution of long-lasting Insecticide-treated nets, starting in 2004, and the introduction of artemisinin-based combination therapy in 2011. Methods: Two malaria surveys were conducted in 2010-2011 and 2013-2014. They included 77 and 92 randomly selected villages, respectively. In each village, all members of 30 randomly selected households gave blood samples and were assessed for malaria infection by light microscopy...
October 1, 2017: Bulletin of the World Health Organization
https://www.readbyqxmd.com/read/29146974/human-cyclophilin-b-forms-part-of-a-multi-protein-complex-during-erythrocyte-invasion-by-plasmodium-falciparum
#11
Prem Prakash, Mohammad Zeeshan, Ekta Saini, Azhar Muneer, Sachin Khurana, Bishwanath Kumar Chourasia, Arunaditya Deshmukh, Inderjeet Kaur, Surabhi Dabral, Niharika Singh, Zille Anam, Ayushi Chaurasiya, Shikha Kaushik, Pradeep Dahiya, Md Kalamuddin, Jitendra Kumar Thakur, Asif Mohmmed, Anand Ranganathan, Pawan Malhotra
Invasion of human erythrocytes by Plasmodium falciparum merozoites involves multiple interactions between host receptors and their merozoite ligands. Here we report human Cyclophilin B as a receptor for PfRhopH3 during merozoite invasion. Localization and binding studies show that Cyclophilin B is present on the erythrocytes and binds strongly to merozoites. We demonstrate that PfRhopH3 binds to the RBCs and their treatment with Cyclosporin A prevents merozoite invasion. We also show a multi-protein complex involving Cyclophilin B and Basigin, as well as PfRhopH3 and PfRh5 that aids the invasion...
November 16, 2017: Nature Communications
https://www.readbyqxmd.com/read/29146922/molecular-definition-of-multiple-sites-of-antibody-inhibition-of-malaria-transmission-blocking-vaccine-antigen-pfs25
#12
Stephen W Scally, Brandon McLeod, Alexandre Bosch, Kazutoyo Miura, Qi Liang, Sean Carroll, Sini Reponen, Ngan Nguyen, Eldar Giladi, Sebastian Rämisch, Vidadi Yusibov, Allan Bradley, Franck Lemiale, William R Schief, Daniel Emerling, Paul Kellam, C Richter King, Jean-Philippe Julien
The Plasmodium falciparum Pfs25 protein (Pfs25) is a leading malaria transmission-blocking vaccine antigen. Pfs25 vaccination is intended to elicit antibodies that inhibit parasite development when ingested by Anopheles mosquitoes during blood meals. The Pfs25 three-dimensional structure has remained elusive, hampering a molecular understanding of its function and limiting immunogen design. We report six crystal structures of Pfs25 in complex with antibodies elicited by immunization via Pfs25 virus-like particles in human immunoglobulin loci transgenic mice...
November 16, 2017: Nature Communications
https://www.readbyqxmd.com/read/29146584/microrna-tissue-atlas-of-the-malaria-mosquito-anopheles-gambiae
#13
Lena Lampe, Elena A Levashina
Anopheles gambiae mosquitoes transmit the human malaria parasite Plasmodium falciparum, which causes the majority of fatal malaria cases worldwide. The hematophagous life style defines the mosquito reproductive biology and is exploited by P. falciparum for its own sexual reproduction and transmission. The two main phases of the mosquito reproductive cycle, pre-vitellogenic (PV) and post-blood meal (PBM) shape its capacity to transmit malaria. Transition between these phases is tightly coordinated to ensure homeostasis between mosquito tissues and successful reproduction...
November 16, 2017: G3: Genes—Genomes—Genetics
https://www.readbyqxmd.com/read/29145842/age-specific-plasmodium-parasite-profile-in-pre-and-post-itn-intervention-period-at-a-highland-site-in-western-kenya
#14
Ednah N Ototo, Guofa Zhou, Lucy Kamau, Jenard P Mbugi, Christine L Wanjala, Maxwell Machani, Harrysone Atieli, Andrew K Githeko, Guiyun Yan
BACKGROUND: Monitoring and evaluation of entomological, parasitological and clinical data is an important component of malaria control as it is a measure of the success of the interventions. In many studies, clinical data has been used to monitor trends in malaria morbidity and mortality. This study was conducted to demonstrate age dependent prevalence of malaria in the pre- and post-interventions period. METHODS: A series of cross-sectional malaria parasitological surveys were conducted in Iguhu, western Kenya...
November 16, 2017: Malaria Journal
https://www.readbyqxmd.com/read/29144217/mechanisms-of-naturally-acquired-immunity-to-p-falciparum-and-approaches-to-identify-merozoite-antigen-targets
#15
Julie Healer, Chris Y Chiu, Diana S Hansen
Malaria is one the most serious infectious diseases with over 200 million clinical cases annually. Most cases of the severe disease are caused by Plasmodium falciparum. The blood stage of Plasmodium parasite is entirely responsible for malaria-associated pathology. The population most susceptible to severe malaria are children under the age of 5, with low levels of immunity. It is only after many years of repeated exposure that individuals living in endemic areas develop clinical immunity. This form of protection prevents clinical episodes by substantially reducing parasite burden...
November 16, 2017: Parasitology
https://www.readbyqxmd.com/read/29143441/cellular-aging-dynamics-after-acute-malaria-infection-a-12-month-longitudinal-study
#16
Muhammad Asghar, Victor Yman, Manijeh Vafa Homann, Klara Sondén, Ulf Hammar, Dennis Hasselquist, Anna Färnert
Accelerated cellular aging and reduced lifespan have recently been shown in birds chronically infected with malaria parasites. Whether malaria infection also affects cellular aging in humans has not been reported. Here, we assessed the effect of a single acute Plasmodium falciparum malaria infection on cellular aging dynamics in travelers prospectively followed over one year in Sweden. DNA and RNA were extracted from venous blood collected at the time of admission and repeatedly up to one year. Telomere length was measured using real-time quantitative PCR, while telomerase activity and CDKN2A expression were measured by reverse transcriptase (RT)-qPCR...
November 16, 2017: Aging Cell
https://www.readbyqxmd.com/read/29141762/efficacy-of-artemether-lumefantrine-for-uncomplicated-plasmodium-falciparum-malaria-in-cruzeiro-do-sul-brazil-2016
#17
Megumi Itoh, Suiane Negreiros do Valle, Sâmela Farias, Thayna Maria Holanda de Souza, Giselle Maria Rachid Viana, Naomi Lucchi, Stella Chenet, Paola Marchesini, Marinete Póvoa, Ana Carolina Faria E Silva Santelli, Alexandre Macedo de Oliveira
We evaluated the therapeutic efficacy of artemether-lumefantrine (AL) fixed-dose combination to treat uncomplicated Plasmodium falciparum malaria in Cruzeiro do Sul, Acre State, in the Amazon region of Brazil. Between December 2015 and May 2016, we enrolled 79 patients, 5-79 years old with fever or history of fever in the previous 48 hours and P. falciparum monoinfection confirmed by microscopy. Attempts were made to provide direct observation or phone reminders for all six doses of AL, and patients were followed-up for 28 days...
November 6, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/29141758/in-vitro-sensitivity-of-pyronaridine-in-thai-isolates-of-plasmodium-falciparum
#18
Kittiya Mahotorn, Peerapan Tan-Ariya, Thunyapit Thita, Toon Ruang-Areerate, Naruemon Sittichot, Nantana Suwandittakul, Mathirut Mungthin
Pyronaridine, a Mannich base antimalarial agent with a high activity against chloroquine-resistant Plasmodium falciparum, has been combined with artesunate as a new artemisinin derivative-based combination therapy (ACT). Pyronaridine-artesunate combination could be one of the choices for the treatment of uncomplicated falciparum malaria in multidrug-resistant areas including Thailand. The aim of this study was to determine in vitro sensitivity and cross-resistance pattern of pyronaridine in Thai isolates of P...
October 23, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/29141757/protein-specific-features-associated-with-variability-in-human-antibody-responses-to-plasmodium-falciparum-malaria-antigens
#19
Eugene W Liu, Jeff Skinner, Tuan M Tran, Krishan Kumar, David L Narum, Aarti Jain, Aissata Ongoiba, Boubacar Traore, Philip L Felgner, Peter D Crompton
The magnitude of antibody responses varies across the individual proteins that constitute any given microorganism, both in the context of natural infection and vaccination with attenuated or inactivated pathogens. The protein-specific factors underlying this variability are poorly understood. In 267 individuals exposed to intense seasonal malaria, we examined the relationship between immunoglobulin G (IgG) responses to 861 Plasmodium falciparum proteins and specific features of these proteins, including their subcellular location, relative abundance, degree of polymorphism, and whether they are predicted to have human orthologs...
October 23, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/29141739/advancing-global-health-through-development-and-clinical-trials-partnerships-a-randomized-placebo-controlled-double-blind-assessment-of-safety-tolerability-and-immunogenicity-of-plasmodium-falciparum-sporozoites-vaccine-for-malaria-in-healthy-equatoguinean
#20
Ally Olotu, Vicente Urbano, Ali Hamad, Martin Eka, Mwajuma Chemba, Elizabeth Nyakarungu, Jose Raso, Esther Eburi, Dolores O Mandumbi, Dianna Hergott, Carl D Maas, Mitoha O Ayekaba, Diosdado N Milang, Matilde R Rivas, Tobias Schindler, Oscar M Embon, Adam J Ruben, Elizabeth Saverino, Yonas Abebe, Natasha Kc, Eric R James, Tooba Murshedkar, Anita Manoj, Sumana Chakravarty, Minglin Li, Matthew Adams, Chris Schwabe, Luis Segura, Claudia Daubenberger, Marcel Tanner, Thomas L Richie, Peter F Billingsley, B Kim Lee Sim, Salim Abdulla, Stephen L Hoffman
Equatorial Guinea (EG) has implemented a successful malaria control program on Bioko Island. A highly effective vaccine would be an ideal complement to this effort and could lead to halting transmission and eliminating malaria. Sanaria(®)Plasmodium falciparum sporozoites (PfSPZ) Vaccine is being developed for this purpose. To begin the process of establishing the efficacy of and implementing a PfSPZ Vaccine mass vaccination program in EG, we decided to conduct a series of clinical trials of PfSPZ Vaccine on Bioko Island...
October 30, 2017: American Journal of Tropical Medicine and Hygiene
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