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https://www.readbyqxmd.com/read/28441548/ferrocenyl-and-organic-novobiocin-derivatives-synthesis-and-their-in-vitro-biological-activity
#1
Mziyanda Mbaba, Amanda N Mabhula, Natasha Boel, Adrienne L Edkins, Michelle Isaacs, Heinrich C Hoppe, Setshaba D Khanye
A focused series of novobiocin derivatives containing a ferrocene unit together with their corresponding organic novobiocin analogues have been synthesized in modest to good yields. These compounds were screened for biological activity against a chloroquine-sensitive strain of Plasmodium falciparum (3D7) and human breast cancer cell line (HCC38). With the exception of compounds 5c and 5d, the general trend observed is that incorporation of the ferrocene moiety into novobiocin scaffold resulted in compounds 6a-d/6f showing enhanced activity compared to organic analogues 5a-b and 5e-f...
April 13, 2017: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/28438929/molecular-profile-of-malaria-drug-resistance-markers-of-plasmodium-falciparum-in-suriname
#2
Stella M Chenet, Sheila Akinyi Okoth, Julia Kelley, Naomi Lucchi, Curtis S Huber, Stephen Vreden, Alexandre Macedo de Oliveira, John W Barnwell, Venkatachalam Udhayakumar, Malti R Adhin
In Suriname, an artesunate monotherapy therapeutic efficacy trial was recently conducted to evaluate partial artemisinin resistance emerging in Plasmodium falciparum We genotyped the PfK13 propeller domain of P. falciparum in forty samples as well as other mutations proposed to be associated with artemisinin resistant mutants. We did not find any mutations previously associated with artemisinin resistance in Southeast Asia but we found fixed resistance mutations for chloroquine and sulfadoxine-pyrimethamine...
April 24, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28438197/anti-malarial-landscape-in-myanmar-results-from-a-nationally-representative-survey-among-community-health-workers-and-the-private-sector-outlets-in-2015-2016
#3
Si Thu Thein, Hnin Su Su Khin, Aung Thi
BACKGROUND: In 2015/2016, an ACTwatch outlet survey was implemented to assess the anti-malarial and malaria testing landscape in Myanmar across four domains (Eastern, Central, Coastal, Western regions). Indicators provide an important benchmark to guide Myanmar's new National Strategic Plan to eliminate malaria by 2030. METHODS: This was a cross-sectional survey, which employed stratified cluster-random sampling across four regions in Myanmar. A census of community health workers (CHWs) and private outlets with potential to distribute malaria testing and/or treatment was conducted...
April 25, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28438194/malaria-profiles-and-challenges-in-artemisinin-resistance-containment-in-myanmar
#4
Thet Wai Nwe, Tin Oo, Khin Thet Wai, Shuisen Zhou, Johan van Griensven, Palanivel Chinnakali, Safieh Shah, Aung Thi
BACKGROUND: This study examined evolving malaria profiles from January, 2010 to December, 2014 to evaluate achievements and challenges of implementing measures to prevent and control spread of artemisinin resistance in Myanmar. METHODS: Using National Malaria Control Programme (NMCP) data, a cross-sectional descriptive study of 52 townships in artemisinin-resistant containment areas in Myanmar was conducted. Annual program data were analysed, and trends over time are graphically presented...
April 25, 2017: Infectious Diseases of Poverty
https://www.readbyqxmd.com/read/28438159/prevalence-of-plasmodium-falciparum-and-non-p-falciparum-infections-in-a-highland-district-in-ghana-and-the-influence-of-hiv-and-sickle-cell-disease
#5
Ewurama D A Owusu, Charles A Brown, Martin P Grobusch, Petra Mens
BACKGROUND: In the past two decades, there has been a reported decline in malaria in Ghana and the rest of the world; yet it remains the number one cause of mortality and morbidity. Human immuno-deficiency virus (HIV) and sickle cell disease (SCD) share a common geographical space with malaria in sub-Saharan Africa and an interaction between these three conditions has been suggested. This study determined the Plasmodium falciparum and non-P. falciparum status of symptomatic and non-symptomatic residents of Mpraeso in the highlands of Kwahu-South district of Ghana based on evidence of current national decline...
April 24, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28438155/the-malaria-testing-and-treatment-landscape-in-the-southern-lao-people-s-democratic-republic-pdr
#6
Saysana Phanalasy
BACKGROUND: In the context of national and regional goals to eliminate malaria by 2030, the Center for Malaria Parasitology and Entomology in the Lao PDR is implementing strategies to ensure all malaria cases are detected and appropriately treated with first-line artemisinin combination therapy, artemether-lumefantrine (AL). Timely and relevant evidence to inform policies and strategies is needed to ensure the most effective and efficient use of resources, and to accelerate progress towards elimination goals...
April 25, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28438137/case-report-of-plasmodium-ovale-curtisi-malaria-in-sri-lanka-relevance-for-the-maintenance-of-elimination-status
#7
Sharmini Gunawardena, Rachel F Daniels, Thishan C Yahathugoda, Mirani V Weerasooriya, Katelyn Durfee, Sarah K Volkman, Dyann F Wirth, Nadira D Karunaweera
BACKGROUND: Following its recent certification as malaria-free, imported infections now pose the greatest threat for maintaining this status in Sri Lanka. Imported infections may also introduce species that are uncommon or not previously endemic to these areas. We highlight in this case report the increasing importance of less common malaria species such as Plasmodium ovale in elimination settings and discuss its relevance for the risk of malaria resurgence in the country. CASE PRESENTATION: A 41-year-old patient from southern Sri Lanka was diagnosed with malaria after 8 days of fever...
April 24, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28437604/antiplasmodial-mode-of-action-of-pantothenamides-pantothenate-kinase-serves-as-a-metabolic-activator-not-as-a-target
#8
Marianne de Villiers, Christina Spry, Cristiano Joao Macuamule, Leanne Barnard, Gordon Wells, Kevin J Saliba, Erick Strauss
N-substituted pantothenamides (PanAms) are pantothenate analogues with up to nanomolar potency against blood-stage Plasmodium falciparum (the most virulent species responsible for malaria). Although these compounds are known to target coenzyme A (CoA) biosynthesis and/or utilization, their exact mode of action (MoA) is still unknown. Importantly, PanAms that retain the natural β-alanine moiety are more potent than other variants, consistent with the involvement of processes that are selective for pantothenate (the precursor of CoA) or its derivatives...
April 24, 2017: ACS Infectious Diseases
https://www.readbyqxmd.com/read/28435533/discovery-of-antimalarial-azetidine-2-carbonitriles-that-inhibit-p-falciparum-dihydroorotate-dehydrogenase
#9
Micah Maetani, Nobutaka Kato, Valquiria A P Jabor, Felipe A Calil, Maria Cristina Nonato, Christina A Scherer, Stuart L Schreiber
Dihydroorotate dehydrogenase (DHODH) is an enzyme necessary for pyrimidine biosynthesis in protozoan parasites of the genus Plasmodium, the causative agents of malaria. We recently reported the identification of novel compounds derived from diversity-oriented synthesis with activity in multiple stages of the malaria parasite life cycle. Here, we report the optimization of a potent series of antimalarial inhibitors consisting of azetidine-2-carbonitriles, which we had previously shown to target P. falciparum DHODH in a biochemical assay...
April 13, 2017: ACS Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/28434852/p-%C3%A2-falciparum-malaria-prevalence-among-blood-donors-in-bamako-mali
#10
B Kouriba, A B Diarra, I Douyon, D T Diabaté, F Kamissoko, H Guitteye, M Baby, M A Guindo, O K Doumbo
AIM: Malaria parasite is usually transmitted to humans by Anopheles mosquitoes but it can also be transmitted through blood transfusion. Usually malaria transmission is low in African urban settings. In West Africa where the P. falciparum is the most predominant malaria species, there are limited measures to reduce the risk of blood transfusion malaria. The aim of this study was to evaluate the prevalence of P. falciparum malaria carriage among blood donors in the National Blood Center of Bamako, capital city of Mali...
April 20, 2017: Transfusion Clinique et Biologique: Journal de la Société Française de Transfusion Sanguine
https://www.readbyqxmd.com/read/28434397/watching-the-availability-and-use-of-rapid-diagnostic-tests-rdts-and-artemisinin-based-combination-therapy-act
#11
Richard W Steketee, Thomas P Eisele
At the turn of this new century and after much debate, the malaria community reckoned with failing first line therapies and moved to a global recommendation for deployment of an artemisinin-based combination therapy (ACT) to treat infections due to Plasmodium falciparum. No one said it was going to be easy. This series in the Malaria Journal reports longitudinal snapshots of how the core pillar of malaria elimination of ensuring universal access to malaria diagnosis and treatment is faring-it is safe to say "not so well"...
April 24, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28434376/pre-clinical-and-clinical-development-of-the-first-placental-malaria-vaccine
#12
Caroline Pehrson, Ali Salanti, Thor G Theander, Morten A Nielsen
Malaria during pregnancy is a massive health problem in endemic areas. Placental malaria infections caused by Plasmodium falciparum are responsible for up to one million babies being born with a low birth weight every year. Significant efforts have been invested into preventing the condition. Areas covered: Pub Med was searched using the broad terms "malaria parasite placenta" to identify studies of interactions between parasite and host, "prevention of placental malaria" to identify current strategies to prevent placental malaria, and "placental malaria vaccine" to identify pre-clinical vaccine development...
April 24, 2017: Expert Review of Vaccines
https://www.readbyqxmd.com/read/28431115/spatial-distribution-of-falciparum-malaria-infections-in-zanzibar-implications-for-focal-drug-administration-strategies-targeting-asymptomatic-parasite-carriers
#13
Anders Björkman, Jackie Cook, Hugh Sturrock, Mwinyi Msellem, Abdullah Ali, Weiping Xu, Fabrizio Molteni, Roly Gosling, Chris Drakeley, Andreas Mårtensson
Background.: Optimal use of mass/targeted screen-and-treat or mass or focal drug administration as malaria elimination strategies remains unclear. We therefore studied spatial distribution of Plasmodium falciparum infections to compare simulated effects of these strategies on reducing the parasite reservoir in a pre-elimination setting. Methods.: P. falciparum rapid diagnostic tests (RDTs) and molecular (polymerase chain reaction [PCR]) and serological (enzyme-linked immunosorbent assay) analyses were performed on finger-prick blood samples from a population-based survey in 3 adjacent communities...
May 1, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/28430778/a-no-film-slot-blot-for-the-detection-of-developing-p-falciparum-oocysts-in-mosquitoes
#14
Bryan Grabias, Nitin Verma, Hong Zheng, Abhai K Tripathi, Godfree Mlambo, Merribeth J Morin, Emily Locke, Sanjai Kumar
Non-microscopy-based assays for sensitive and rapid detection of Plasmodium infection in mosquitoes are needed to allow rapid and high throughput measurement of transmission intensity and malaria control program effectiveness. Here, we report on a modified enhanced chemiluminescence-based slot blot assay for detection of Plasmodium falciparum (Pf) circumsporozite protein (PfCSP) expressed on parasite oocysts developing inside the mosquito midgut. This modified assay has several novel features that include eliminating the need for exposure to autoradiography (AR) film, as well as utilizing a novel high affinity anti-CSP antibody, and optimizing assay procedures resulting in significant reduction in the time required to perform the assay...
2017: PloS One
https://www.readbyqxmd.com/read/28430158/identification-of-tight-binding-plasmepsin-ii-and-falcipain-2-inhibitors-in-aqueous-extracts-of-marine-invertebrates-by-the-combination-of-enzymatic-and-interaction-based-assays
#15
Emir Salas-Sarduy, Yasel Guerra, Giovanni Covaleda Cortés, Francesc Xavier Avilés, María A Chávez Planes
Natural products from marine origin constitute a very promising and underexplored source of interesting compounds for modern biotechnological and pharmaceutical industries. However, their evaluation is quite challenging and requires specifically designed assays to reliably identify the compounds of interest in a highly heterogeneous and interfering context. In the present study, we describe a general strategy for the confident identification of tight-binding protease inhibitors in the aqueous extracts of 62 Cuban marine invertebrates, using Plasmodium falciparum hemoglobinases Plasmepsin II and Falcipain 2 as model enzymes...
April 21, 2017: Marine Drugs
https://www.readbyqxmd.com/read/28427455/comparison-of-methods-for-detecting-asymptomatic-malaria-infections-in-the-china-myanmar-border-area
#16
Yonghong Zhao, Yan Zhao, Yanmin Lv, Fei Liu, Qinghui Wang, Peipei Li, Zhenjun Zhao, Yingjie Liu, Liwang Cui, Qi Fan, Yaming Cao
BACKGROUND: Sensitive methods for detecting asymptomatic malaria infections are essential for identifying potential transmission reservoirs and obtaining an accurate assessment of malaria epidemiology in low-endemicity areas aiming to eliminate malaria. PCR techniques to detect parasite nucleic acids (DNA or RNA) are among the most commonly used molecular methods. However, most of these methods are of low throughput and cannot be used for large-scale molecular epidemiological studies...
April 20, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28427451/household-level-spatio-temporal-analysis-of-plasmodium-falciparum-and-plasmodium-vivax-malaria-in-ethiopia
#17
Dinberu Seyoum, Delenasaw Yewhalaw, Luc Duchateau, Patrick Brandt, Angel Rosas-Aguirre, Niko Speybroeck
BACKGROUND: The global decline of malaria burden and goals for elimination has led to an increased interest in the fine-scale epidemiology of malaria. Micro-geographic heterogeneity of malaria infection could have implications for designing targeted small-area interventions. METHODS: Two-year longitudinal cohort study data were used to explore the spatial and spatio-temporal distribution of malaria episodes in 2040 children aged < 10 years in 16 villages near the Gilgel-Gibe hydropower dam in Southwest Ethiopia...
April 20, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28427418/immunity-as-a-predictor-of-anti-malarial-treatment-failure-a-systematic-review
#18
Katherine O'Flaherty, Julia Maguire, Julie A Simpson, Freya J I Fowkes
BACKGROUND: Naturally acquired immunity can reduce parasitaemia and potentially influence anti-malarial treatment outcomes; however, evidence for this in the current literature provides conflicted results. The available evidence was synthesized to determine and quantify the association between host immunity and anti-malarial treatment failure. METHODS: Four databases were searched to identify studies investigating malaria antibody levels in patients receiving anti-malarial treatment for symptomatic malaria with treatment failure recorded according to the World Health Organization classification...
April 20, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28427409/efficacies-of-dha-ppq-and-as-sp-in-patients-with-uncomplicated-plasmodium-falciparum-malaria-in-an-area-of-an-unstable-seasonal-transmission-in-sudan
#19
Abdelrahim O Mohamed, Muzamil M Abdel Hamid, Omer S Mohamed, Nuha S Elkando, Abdelmaroof Suliman, Mariam A Adam, Fahad Awad Ali Elnour, Elfatih M Malik
BACKGROUND: Artemisinin-based combination therapy (ACT), together with other control measures, have reduced the burden of falciparum malaria in sub-Saharan countries, including Sudan. Sudan adopted ACT in 2004 with a remarkable reduction in mortality due to falciparum malaria. However, emergence of resistance to the first-line treatment artesunate and sulfadoxine/pyrimethamine (AS/SP) has created new challenges to the control of malaria in Sudan. A search for an alternative drug of choice for treating uncomplicated malaria has become inevitable...
April 20, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28427365/association-between-fc%C3%AE-receptor-iia-iiia-and-iiib-genetic-polymorphisms-and-susceptibility-to-severe-malaria-anemia-in-children-in-western-kenya
#20
Elly O Munde, Winnie A Okeyo, Evans Raballah, Samuel B Anyona, Tom Were, John M Ong'echa, Douglas J Perkins, Collins Ouma
BACKGROUND: Naturally-acquired immunity to Plasmodium falciparum malaria develops after several episodes of infection. Fc gamma receptors (FcγRs) bind to immunoglobulin G (IgG) antibodies and mediate phagocytosis of opsonized microbes, thereby, linking humoral and cellular immunity. FcγR polymorphisms influence binding affinity to IgGs and consequently, can influence clinical malaria outcomes. Specifically, variations in FcγRIIA -131Arg/His, FcγRIIIA-176F/V and FcγRIIIB-NA1/NA2 modulate immune responses through altered binding preferences to IgGs and immune complexes...
April 20, 2017: BMC Infectious Diseases
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