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https://www.readbyqxmd.com/read/29773818/predicting-transmission-blocking-potential-of-anti-malarial-compounds-in-the-mosquito-feeding-assay-using-plasmodium-falciparum-male-gamete-inhibition-assay
#1
Gonzalo Colmenarejo, Sonia Lozano, Carolina González-Cortés, David Calvo, Juliana Sanchez-Garcia, Jesús-Luís Presa Matilla, Didier Leroy, Janneth Rodrigues
Plasmodium falciparum Standard Membrane Feeding Assay (PfSMFA) is the current gold standard mosquito based confirmatory transmission blocking (TrB) assay for human malaria. However, owing to its complexity only selected gametocytocidal molecules are progressed into SMFA. Predictive tools for evaluation of TrB behavior of compounds in SMFA would be extremely beneficial, but lack of substantially large data sets from many mosquito feeds preempts the ability to perform correlations between outcomes from in vitro assays and SMFA...
May 17, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29769128/the-impact-of-the-scale-up-of-malaria-rapid-diagnostic-tests-on-the-routine-clinical-diagnosis-procedures-for-febrile-illness-a-series-of-repeated-cross-sectional-studies-in-papua-new-guinea
#2
Justin Pulford, Serah Kurumop, Ivo Mueller, Peter M Siba, Manuel W Hetzel
BACKGROUND: This paper examines the impact of the scale-up of malaria rapid diagnostic tests (RDT) on routine clinical diagnosis procedures for febrile illness in primary healthcare settings in Papua New Guinea. METHODS: Repeat, cross-sectional surveys in randomly selected primary healthcare services were conducted. Surveys included passive observation of consecutive febrile case management cases and were completed immediately prior to RDT scale-up (2011) and at 12- (2012) and 60-months (2016) post scale-up...
May 16, 2018: Malaria Journal
https://www.readbyqxmd.com/read/29765991/immune-response-and-evasion-mechanisms-of-plasmodium-falciparum-parasites
#3
REVIEW
Esmael Besufikad Belachew
Malaria causes approximately 212 million cases and 429 thousand deaths annually. Plasmodium falciparum is responsible for the vast majority of deaths (99%) than others. The virulence of P. falciparum is mostly associated with immune response-evading ability. It has different mechanisms to evade both Anopheles mosquito and human host immune responses. Immune-evading mechanisms in mosquito depend mainly on the Pfs47 gene that inhibits Janus kinase-mediated activation. Host complement factor also protects human complement immune attack of extracellular gametes in Anopheles mosquito midgut...
2018: Journal of Immunology Research
https://www.readbyqxmd.com/read/29764439/a-survey-on-outcomes-of-accidental-atovaquone-proguanil-exposure-in-pregnancy
#4
Kathrine R Tan, Jessica K Fairley, Mengxi Wang, Julie R Gutman
BACKGROUND: Malaria chemoprophylaxis options in pregnancy are limited, and atovaquone-proguanil (AP) is not recommended because of insufficient safety evidence. An anonymous, internet-based survey was disseminated to describe outcomes of pregnancies accidentally exposed to AP. Outcomes of interest included miscarriage (defined as pregnancy loss before 20 weeks), stillbirth (defined as pregnancy loss at or after 20 weeks), preterm birth or live birth prior to 37 weeks, and the presence of congenital anomalies...
May 15, 2018: Malaria Journal
https://www.readbyqxmd.com/read/29762709/determinants-of-%C3%AE-herpesvirus-shedding-in-saliva-among-ugandan-children-and-their-mothers
#5
Robert Newton, Nazzarena Labo, Katie Wakeham, Vickie Marshall, Romin Roshan, Angela Nalwoga, Ismail Sebina, Lawrence Muhangi, Emily L Webb, Wendell Miley, Rosemary Rochford, Alison M Elliott, Denise Whitby
Introduction: Epstein Barr Virus (EBV) and Kaposi's sarcoma associated herpesvirus (KSHV) are transmitted via saliva but factors associated with salivary shedding are unknown. Methods: We measured the shedding of both viruses in the saliva of ~500 Ugandan mothers and their six-year old children, testing all participants for EBV and KSHV seropositive individuals for KSHV. Results: EBV and KSHV were shed by 72% and 22% of the mothers, and by 85% and 40% of children, respectively; boys were more likely than girls to shed KSHV (48% versus 30%), but not EBV...
May 12, 2018: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/29756273/expanding-the-sar-of-non-toxic-antiplasmodial-indolyl-3-ethanone-ethers-and-thioethers
#6
Mayibongwe J Lunga, Ruramai L Chisango, Carli Weyers, Michelle Isaacs, Dale Taylor, Adrienne L Edkins, Setshaba D Khanye, Heinrich C Hoppe, Clinton Veale
Despite major strides in reducing Plasmodium falciparum infections, this parasite still accounts for roughly half a million annual deaths. This problem is compounded by reduced efficacy of artemisinin combination therapies (ACT). Therefore, the development and optimisation of novel antimalarial chemotypes is critical. In this study, we describe our strategic approach to optimise a class of previously reported antimalarials, resulting in the discovery compounds 13 and 14 whose activity was equipotent to chloroquine against the P...
May 13, 2018: ChemMedChem
https://www.readbyqxmd.com/read/29744700/the-effect-of-dietary-antioxidant-supplementation-in-a-vertebrate-host-on-the-infection-dynamics-and-transmission-of-avian-malaria-to-the-vector
#7
Jessica Delhaye, Olivier Glaizot, Philippe Christe
Host susceptibility to parasites is likely to be influenced by intrinsic factors, such as host oxidative status determined by the balance between pro-oxidant production and antioxidant defences. As a result, host oxidative status acts as an environmental factor for parasites and may constrain parasite development. We evaluated the role of host oxidative status on infection dynamics of an avian malarial parasite by providing canaries (Serinus canaria) with an antioxidant supplementation composed of vitamin E (a lipophilic antioxidant) and olive oil, a source of monounsaturated fatty acids...
May 9, 2018: Parasitology Research
https://www.readbyqxmd.com/read/29743114/igm-and-igg-against-plasmodium-falciparum-lysate-as-surrogates-of-malaria-exposure-and-protection-during-pregnancy
#8
Alfredo Mayor, Carlota Dobaño, Augusto Nhabomba, Caterina Guinovart, Alfons Jiménez, Maria Nelia Manaca, Ruth Aguilar, Arnoldo Barbosa, Mauricio H Rodríguez, Pau Cisteró, Lazaro M Quimice, Clara Menéndez, John J Aponte, Jaume Ordi, Chetan E Chitnis, Pedro L Alonso
BACKGROUND: Difficulties to disentangle the protective versus exposure role of anti-malarial antibodies hamper the identification of clinically-relevant immune targets. Here, factors affecting maternal IgG and IgMs against Plasmodium falciparum antigens, as well as their relationship with parasite infection and clinical outcomes, were assessed in mothers and their children. Antibody responses among 207 Mozambican pregnant women at delivery against MSP119 , EBA175, AMA1, DBLα and parasite lysate (3D7, R29 and E8B parasite lines), as well as the surface of infected erythrocytes, were assessed by enzyme-linked immunosorbent assay and flow cytometry...
May 10, 2018: Malaria Journal
https://www.readbyqxmd.com/read/29742871/the-effect-of-abo-blood-groups-hemoglobinopathy-and-heme-oxygenase-1-polymorphisms-on-malaria-susceptibility-and-severity
#9
Jiraporn Kuesap, Kesara Na-Bangchang
Malaria is one of the most important public health problems in tropical areas on the globe. Several factors are associated with susceptibility to malaria and disease severity, including innate immunity such as blood group, hemoglobinopathy, and heme oxygenase-1 (HO-1) polymorphisms. This study was carried out to investigate association among ABO blood group, thalassemia types and HO-1 polymorphisms in malaria. The malarial blood samples were collected from patients along the Thai-Myanmar border. Determination of ABO blood group, thalassemia variants, and HO-1 polymorphisms were performed using agglutination test, low pressure liquid chromatography and polymerase chain reaction, respectively...
April 2018: Korean Journal of Parasitology
https://www.readbyqxmd.com/read/29739900/bone-marrow-is-a-major-parasite-reservoir-in-plasmodium-vivax-infection
#10
Nicanor Obaldia, Elamaran Meibalan, Juliana M Sa, Siyuan Ma, Martha A Clark, Pedro Mejia, Roberto R Moraes Barros, William Otero, Marcelo U Ferreira, James R Mitchell, Danny A Milner, Curtis Huttenhower, Dyann F Wirth, Manoj T Duraisingh, Thomas E Wellems, Matthias Marti
Plasmodium vivax causes heavy burdens of disease across malarious regions worldwide. Mature P. vivax asexual and transmissive gametocyte stages occur in the blood circulation, and it is often assumed that accumulation/sequestration in tissues is not an important phase in their development. Here, we present a systematic study of P. vivax stage distributions in infected tissues of nonhuman primate (NHP) malaria models as well as in blood from human infections. In a comparative analysis of the transcriptomes of P...
May 8, 2018: MBio
https://www.readbyqxmd.com/read/29739485/inhibition-of-ex-vivo-erythropoiesis-by-secreted-and-haemozoin-associated-plasmodium-falciparum-products
#11
Daniela Boehm, Lydia Healy, Sarah Ring, Angus Bell
It has been estimated that up to a third of global malaria deaths may be attributable to malarial anaemia, with children and pregnant women being those most severely affected. An inefficient erythropoietic response to the destruction of both infected and uninfected erythrocytes in infections with Plasmodium spp. contributes significantly to the development and persistence of such anaemia. The underlying mechanisms, which could involve both direct inhibition of erythropoiesis by parasite-derived factors and indirect inhibition as a result of modulation of the immune response, remain poorly understood...
May 9, 2018: Parasitology
https://www.readbyqxmd.com/read/29731711/artemisinin-prevents-glutamate-induced-neuronal-cell-death-via-akt-pathway-activation
#12
Shao-Peng Lin, Wenjun Li, Ali Winters, Ran Liu, Shao-Hua Yang
Artemisinin is an anti-malarial drug that has been in use for almost half century. Recently, novel biological effects of artemisinin on cancer, inflammation-related disorders and cardiovascular disease were reported. However, neuroprotective actions of artemisinin against glutamate-induced oxidative stress have not been investigated. In the current study, we determined the effect of artemisinin against oxidative insult in HT-22 mouse hippocampal cell line. We found that pretreatment of artemisinin declined reactive oxygen species (ROS) production, attenuated the collapse of mitochondrial membrane potential induced by glutamate and rescued HT-22 cells from glutamate-induced cell death...
2018: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/29724219/growth-of-plasmodium-falciparum-in-response-to-a-rotating-magnetic-field
#13
Rebecca C Gilson, Robert J Deissler, Richard F Bihary, William C Condit, Mary E Thompson, D'Arbra Blankenship, Kerry O Grimberg, Robert W Brown, Brian T Grimberg
BACKGROUND: Plasmodium falciparum is the deadliest strain of malaria and the mortality rate is increasing because of pathogen drug resistance. Increasing knowledge of the parasite life cycle and mechanism of infection may provide new models for improved treatment paradigms. This study sought to investigate the paramagnetic nature of the parasite's haemozoin to inhibit parasite viability. RESULTS: Paramagnetic haemozoin crystals, a byproduct of the parasite's haemoglobin digestion, interact with a rotating magnetic field, which prevents their complete formation, causing the accumulation of free haem, which is lethal to the parasites...
May 3, 2018: Malaria Journal
https://www.readbyqxmd.com/read/29724210/drug-use-in-the-management-of-uncomplicated-malaria-in-public-health-facilities-in-the-democratic-republic-of-the-congo
#14
Nsengi Y Ntamabyaliro, Christian Burri, Didier B Nzolo, Aline B Engo, Yves N Lula, Samuel M Mampunza, Célestin N Nsibu, Gauthier K Mesia, Jean-Marie N Kayembe, Joris L Likwela, Leon M Kintaudi, Gaston L Tona
BACKGROUND: Malaria the first causes of death from parasitic infection worldwide. Interventions to reduce the burden of malaria have produced a tremendous drop in malaria morbidity and mortality. However, progress is slower in DRC, which shares with Nigeria 39% of deaths related to malaria globally. Inappropriate use of drugs may be one of the factors of this below-average performance. The aim of this study was to describe the use of drugs in the management of uncomplicated malaria in public health facilities in DRC...
May 3, 2018: Malaria Journal
https://www.readbyqxmd.com/read/29718775/multiple-e-pharmacophore-modelling-pooled-with-high-throughput-virtual-screening-docking-and-molecular-dynamics-simulations-to-discover-potential-inhibitors-of-plasmodium-falciparum-lactate-dehydrogenase-pfldh
#15
Shalini Saxena, Laxman Durgam, Lalitha Guruprasad
Development of new antimalarial drugs continues to be of huge importance because of the resistance of malarial parasite towards currently used drugs. Due to the reliance of parasite on glycolysis for energy generation, glycolytic enzymes have played important role as potential targets for the development of new drugs. Plasmodium falciparum lactate dehydrogenase (PfLDH) is a key enzyme for energy generation of malarial parasites and is considered to be a potential antimalarial target. Presently, there are nearly 15 crystal structures bound with inhibitors and substrate that are available in the protein data bank (PDB)...
May 2, 2018: Journal of Biomolecular Structure & Dynamics
https://www.readbyqxmd.com/read/29713556/relapsing-malaria-a-case-report-of-primaquine-resistance
#16
Christopher Dijanic, Jillian Nickerson, Sunita Shakya, Amanda Dijanic, Marilyn Fabbri
Primaquine (an 8-aminoquinoline malarial therapy) is the only FDA-approved therapy to treat the hypnozoite stage of P. vivax . We think of relapse occurring because of parasitic resistance or poor compliance secondary to drug toxicities. However, in patients with repeated treatment failure, we must consider CYP-450 mutations affecting drug metabolism as an important cause of relapse. A 47-year-old man who travelled to a jungle in Venezuela was diagnosed with P. falciparum and P. vivax in July 2015. He was treated with seven rounds of primaquine-based therapy in the following year, all resulted in relapse without further exposure to endemic areas...
2018: Case Reports in Infectious Diseases
https://www.readbyqxmd.com/read/29713235/antimalarial-drug-prescribing-by-healthcare-workers-when-malaria-testing-is-negative-a-qualitative-study-in-madagascar
#17
David Harimbola Rakotonandrasana, Takahiro Tsukahara, Noriko Yamamoto-Mitani
Background: Despite the World Health Organization and the National Malaria Program of Madagascar recommending that antimalarial drugs only be prescribed for patients with positive results on malaria rapid diagnostic tests, healthcare workers continue to prescribe these drugs for cases with negative test results. We explored why and how primary healthcare workers in Madagascar continue to prescribe antimalarial drugs despite this guidance. Methods: We purposively selected 14 medical doctors and 2 nurses from 11 primary health facilities (6 public, 5 private) in Toliara, Madagascar, and interviewed them regarding their antimalarial prescribing behaviors...
2018: Tropical Medicine and Health
https://www.readbyqxmd.com/read/29712656/the-artemisinin-derivative-artemisone-is-a-potent-inhibitor-of-human-cytomegalovirus-replication
#18
E Oiknine-Djian, Y Weisblum, A Panet, H N Wong, R K Haynes, D G Wolf
Human cytomegalovirus (HCMV) is a major cause of disease in immunocompromised individuals and the most common cause of congenital infection and neuro-sensorial disease. The expanding target populations for HCMV antiviral treatment along with the limitations of the currently available HCMV DNA polymerase inhibitors underscore the need for new antiviral agents with alternative modes of action. The anti-malarial artemisinin derivative artesunate was shown to inhibit HCMV in vitro , yet has demonstrated limited antiviral efficacy in vivo , prompting our search for more potent anti-HCMV artemisinin derivatives...
April 30, 2018: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29703587/the-genome-of-artemisia-annua-provides-insight-into-the-evolution-of-asteraceae-family-and-artemisinin-biosynthesis
#19
Qian Shen, Lida Zhang, Zhihua Liao, Shengyue Wang, Tingxiang Yan, Pu Shi, Meng Liu, Xueqing Fu, Qifang Pan, Yuliang Wang, Zongyou Lv, Xu Lu, Fangyuan Zhang, Weimin Jiang, Yanan Ma, Minghui Chen, Xiaolong Hao, Ling Li, Yueli Tang, Gang Lv, Yan Zhou, Xiaofen Sun, Peter E Brodelius, Jocelyn K C Rose, Kexuan Tang
Artemisia annua, commonly known as sweet wormwood or Qinghao, is a shrub native to China and has long been used for medicinal purposes. A. annua is now cultivated globally as the only natural source of a potent anti-malarial compound, artemisinin. Here, we report a high-quality draft assembly of the 1.74-gigabase genome of A. annua, which is highly heterozygous, rich in repetitive sequences, and contains 63 226 protein-coding genes, one of the largest numbers among the sequenced plant species. We found that, as one of a few sequenced genomes in the Asteraceae, the A...
April 20, 2018: Molecular Plant
https://www.readbyqxmd.com/read/29703425/effect-of-generalised-access-to-early-diagnosis-and-treatment-and-targeted-mass-drug-administration-on-plasmodium-falciparum-malaria-in-eastern-myanmar-an-observational-study-of-a-regional-elimination-programme
#20
Jordi Landier, Daniel M Parker, Aung Myint Thu, Khin Maung Lwin, Gilles Delmas, François H Nosten
BACKGROUND: Potentially untreatable Plasmodium falciparum malaria threatens the Greater Mekong subregion. A previous series of pilot projects in Myanmar, Laos, Cambodia, and Vietnam suggested that mass drug administration was safe, and when added to provision of early diagnosis and treatment, could reduce the reservoir of P falciparum and interrupts transmission. We examined the effects of a scaled-up programme of this strategy in four townships of eastern Myanmar on the incidence of P falciparum malaria...
April 24, 2018: Lancet
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