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https://www.readbyqxmd.com/read/28732142/network-meta-analysis-including-treatment-by-covariate-interactions-consistency-can-vary-across-covariate-values
#1
Sarah Donegan, Nicky J Welton, Catrin Tudur Smith, Umberto D'Alessandro, Sofia Dias
BACKGROUND: Many reviews aim to compare numerous treatments and report results stratified by subgroups (e.g. by disease severity). In such cases, a network meta-analysis model including treatment by covariate interactions can estimate the relative effects of all treatment pairings for each subgroup of patients. Two key assumptions underlie such models, consistency of treatment effects and consistency of the regression coefficients for the interactions. Consistency may differ depending on the covariate value at which consistency is assessed...
July 21, 2017: Research Synthesis Methods
https://www.readbyqxmd.com/read/28732053/dysregulation-of-pulmonary-endothelial-protein-c-receptor-and-thrombomodulin-in-severe-falciparum-malaria-associated-ards-relevant-to-hemozoin
#2
Sitang Maknitikul, Natthanej Luplertlop, Georges E R Grau, Sumate Ampawong
To investigate the role of the protein C system, endothelial protein C receptor (EPCR) and thrombomodulin (TM) in the pathogenesis of malaria-associated acute respiratory distress syndrome (ARDS) in relation to hemozoin and proinflammatory cytokines-induced type II pneumocyte injury and -aggravated pulmonary resolution. A total of 29 left-over lung specimens that were obtained from patients who died from severe falciparum malaria were examined. Histopathological, immunohistochemical and electron microscopic analyses revealed that ARDS coexisted with pulmonary edema and systemic bleeding; the severity was dependent on the level of hemozoin deposition in the lung and internal alveolar hemorrhaging...
2017: PloS One
https://www.readbyqxmd.com/read/28732045/the-exported-chaperone-hsp70-x-supports-virulence-functions-for-plasmodium-falciparum-blood-stage-parasites
#3
Sarah C Charnaud, Matthew W A Dixon, Catherine Q Nie, Lia Chappell, Paul R Sanders, Thomas Nebl, Eric Hanssen, Matthew Berriman, Jo-Anne Chan, Adam J Blanch, James G Beeson, Julian C Rayner, Jude M Przyborski, Leann Tilley, Brendan S Crabb, Paul R Gilson
Malaria is caused by five different Plasmodium spp. in humans each of which modifies the host erythrocyte to survive and replicate. The two main causes of malaria, P. falciparum and P. vivax, differ in their ability to cause severe disease, mainly due to differences in the cytoadhesion of infected erythrocytes (IE) in the microvasculature. Cytoadhesion of P. falciparum in the brain leads to a large number of deaths each year and is a consequence of exported parasite proteins, some of which modify the erythrocyte cytoskeleton while others such as PfEMP1 project onto the erythrocyte surface where they bind to endothelial cells...
2017: PloS One
https://www.readbyqxmd.com/read/28731898/steady-progress-toward-a-malaria-vaccine
#4
Kirsten E Lyke
PURPOSE OF REVIEW: Great progress has been made in reducing malaria morbidity and mortality, yet the parasite continues to cause a startling 200 million infections and 500 000 deaths annually. Malaria vaccine development is pushing new boundaries by steady advancement toward a licensed product. RECENT FINDINGS: Despite 50 years of research, the complexity of Plasmoidum falciparum confounds all attempts to eradicate the organism. This very complexity has pushed the boundaries of vaccine development to new heights, yet it remains to be seen if an affordable vaccine can provide durable and high-level protection...
July 20, 2017: Current Opinion in Infectious Diseases
https://www.readbyqxmd.com/read/28731595/identification-of-carboxylesterase-genes-associated-with-pyrethroid-resistance-in-the-malaria-vector-anopheles-sinensis-diptera-culicidae
#5
Xue-Mei Wu, Bo-Ying Xu, Feng-Ling Si, Jianyong Li, Zhen-Tian Yan, Zheng-Wen Yan, Xiu He, Bin Chen
BACKGROUND: Carboxylesterases (CCEs) are one of three large detoxification enzyme families. Some CCEs are active on synthetic insecticides with ester structures. Anopheles sinensis is an important malaria vector in eastern Asia. This study identified and characterized the CCE genes in the An. sinensis genome and determined CCE genes associated with pyrethroid resistance using RNA-seq and RT-qPCR, in An. sinensis from Anhui, Chongqing, and Yunnan in China. RESULTS: Fifty-seven putative CCEs were identified and placed into 3 classes, 12 subfamilies and 14 clades through phylogenetics and homology analyses...
July 21, 2017: Pest Management Science
https://www.readbyqxmd.com/read/28730969/the-battle-for-iron-between-humans-and-microbes
#6
Peggy L Carver
Iron is an essential micronutrient for bacteria, fungi, and humans; as such, each has evolved specialized iron uptake systems to acquire iron from the extracellular environment and a complex 'tug of war' has evolved between human hosts and pathogenic microorganisms in the battle for this vital nutrient. In humans, sequestration (hiding) of iron from invading pathogens is often successful; however, many pathogens have evolved mechanisms to circumvent this approach. Clinically, controversy continues whether iron overload or administration of iron results in an increased risk of infection...
July 20, 2017: Current Medicinal Chemistry
https://www.readbyqxmd.com/read/28730366/to-coil-or-not-to-coil-application-practices-perception-and-efficacy-of-mosquito-coils-in-a-malaria-endemic-community-in-ghana
#7
Silas W Avicor, Mustafa F F Wajidi, Ebenezer O Owusu
Although evidence of mosquito coils' impact on disease epidemiology is limited, they are popularized as mosquito-borne disease prevention devices. Their usage affects the environment, human and mosquito health. This study investigated the perception, usage pattern and efficacy of coils in a predominantly poor malaria-endemic Ghanaian peri-urban area. Information on protection methods, perception and usage pattern was garnered using questionnaires. The efficacy of commonly used coils in the area was then assessed on the malaria vector, Anopheles gambiae, in a glass chamber...
July 20, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28729672/plasmodium-berghei-p47-is-essential-for-ookinete-protection-from-the-anopheles-gambiae-complement-like-response
#8
Chiamaka Valerie Ukegbu, Maria Giorgalli, Hassan Yassine, Jose Luis Ramirez, Chrysanthi Taxiarchi, Carolina Barillas-Mury, George K Christophides, Dina Vlachou
Malaria is a mosquito-borne disease affecting millions of people every year. The rodent parasite Plasmodium berghei has served as a model for human malaria transmission studies and played a pivotal role in dissecting the mosquito immune response against infection. The 6-cysteine protein P47, known to be important for P. berghei female gamete fertility, is shown to serve a different function in Plasmodium falciparum, protecting ookinetes from the mosquito immune response. Here, we investigate the function of P...
July 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28728995/a-mechanistic-model-quantifies-artemisinin-induced-parasite-growth-retardation-in-blood-stage-plasmodium-falciparum-infection
#9
Pengxing Cao, Nectarios Klonis, Sophie Zaloumis, David S Khoury, Deborah Cromer, Miles P Davenport, Leann Tilley, Julie A Simpson, James M McCaw
Falciparum malaria is a major parasitic disease causing widespread morbidity and mortality globally. Artemisinin derivatives-the most effective and widely-used antimalarials that have helped reduce the burden of malaria by 60% in some areas over the past decade-have recently been found to induce growth retardation of blood-stage Plasmodium falciparum when applied at clinically relevant concentrations. To date, no model has been designed to quantify the growth retardation effect and to predict the influence of this property on in vivo parasite killing...
July 18, 2017: Journal of Theoretical Biology
https://www.readbyqxmd.com/read/28728902/role-of-mirnas-in-development-and-disease-lessons-learnt-from-small-organisms
#10
REVIEW
Swati Chandra, Divya Vimal, Divya Sharma, Vipin Rai, Subash Chandra Gupta, D Kar Chowdhuri
MicroRNAs (miRNAs) constitute a class of small (21-24 nucleotides) non-coding RNAs that regulate gene expression at the post-transcriptional level. Caenorhabditis elegans, Drosophila melanogaster, and many other small organisms have been instrumental in deciphering the biological functions of miRNAs. While some miRNAs from small organisms are highly conserved across the taxa, others are organism specific. The miRNAs are known to play a crucial role during development and in various cellular functions such as cell survival, cell proliferation, and differentiation...
July 17, 2017: Life Sciences
https://www.readbyqxmd.com/read/28728898/kbe009-an-antimalarial-bestatin-like-inhibitor-of-the-plasmodium-falciparum-m1-aminopeptidase-discovered-in-an-ugi-multicomponent-reaction-derived-peptidomimetic-library
#11
Jorge González-Bacerio, Sarah El Chamy Maluf, Yanira Méndez, Isel Pascual, Isabelle Florent, Pollyana M S Melo, Alexandre Budu, Juliana C Ferreira, Ernesto Moreno, Adriana K Carmona, Daniel G Rivera, Maday Alonso Del Rivero, Marcos L Gazarini
Malaria is a global human parasitic disease mainly caused by the protozoon Plasmodium falciparum. Increased parasite resistance to current drugs determines the relevance of finding new treatments against new targets. A novel target is the M1 alanyl-aminopeptidase from P. falciparum (PfA-M1), which is essential for parasite development in human erythrocytes and is inhibited by the pseudo-peptide bestatin. In this work, we used a combinatorial multicomponent approach to produce a library of peptidomimetics and screened it for the inhibition of recombinant PfA-M1 (rPfA-M1) and the in vitro growth of P...
July 4, 2017: Bioorganic & Medicinal Chemistry
https://www.readbyqxmd.com/read/28728595/malaria-after-international-travel-a-geosentinel-analysis-2003-2016
#12
Kristina M Angelo, Michael Libman, Eric Caumes, Davidson H Hamer, Kevin C Kain, Karin Leder, Martin P Grobusch, Stefan H Hagmann, Phyllis Kozarsky, David G Lalloo, Poh-Lian Lim, Calvin Patimeteeporn, Philippe Gautret, Silvia Odolini, François Chappuis, Douglas H Esposito
BACKGROUND: More than 30,000 malaria cases are reported annually among international travellers. Despite improvements in malaria control, malaria continues to threaten travellers due to inaccurate perception of risk and sub-optimal pre-travel preparation. METHODS: Records with a confirmed malaria diagnosis after travel from January 2003 to July 2016 were obtained from GeoSentinel, a global surveillance network of travel and tropical medicine providers that monitors travel-related morbidity...
July 20, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28728572/knowledge-attitudes-and-practices-on-malaria-transmission-in-mamfene-kwazulu-natal-province-south-africa-2015
#13
Pinky N Manana, Lazarus Kuonza, Alfred Musekiwa, Hluphi D Mpangane, Lizette L Koekemoer
BACKGROUND: In South Africa malaria is endemic in Mpumalanga, Limpopo and the north-eastern areas of KwaZulu-Natal provinces. South Africa has set targets to eliminate malaria by 2018 and research into complementary vector control tools such as the Sterile Insect Technique (SIT) is ongoing. It is important to understand community perceptions regarding malaria transmission and control interventions to enable development of community awareness campaign messages appropriate to the needs of the community...
July 20, 2017: BMC Public Health
https://www.readbyqxmd.com/read/28728558/accuracy-of-a-plasmodium-falciparum-specific-histidine-rich-protein-2-rapid-diagnostic-test-in-the-context-of-the-presence-of-non-malaria-fevers-prior-anti-malarial-use-and-seasonal-malaria-transmission
#14
Francois Kiemde, Massa Dit Achille Bonko, Marc Christian Tahita, Palpouguini Lompo, Toussaint Rouamba, Halidou Tinto, Michael Boele van Hensbroek, Petra F Mens, Henk D F H Schallig
BACKGROUND: It remains challenging to distinguish malaria from other fever causing infections, as a positive rapid diagnostic test does not always signify a true active malaria infection. This study was designed to determine the influence of other causes of fever, prior anti-malarial treatment, and a possible seasonality of the performance of a PfHRP2 RDT for the diagnosis of malaria in children under-5 years of age living in a malaria endemic area. METHODS: A prospective etiology study was conducted in 2015 among febrile children under 5 years of age in Burkina Faso...
July 20, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28728201/-fever-and-headache-after-a-vacation-in-thailand
#15
Benedikt Schwermer, Daniel Eschle, Constantine Bloch-Infanger
History 50 year-old man with fever and headache starting one week after returning from his vacation in Thailand. His general practitioner prescribed amoxicillin/clavulanic acid, without further analyses to pinpoint the infection. Examinations The examination of cerebro-spinal fluid was crucial for the final diagnosis. Lumbar puncture demonstrated a predominantly mononuclear pleocytosis of 80 cells/µl (< 5) with an elevated protein of 782 mg/l (< 450); glucose and lactate were within normal limits...
July 2017: Deutsche Medizinische Wochenschrift
https://www.readbyqxmd.com/read/28728131/the-distribution-of-organochlorine-pesticides-in-sediments-from-isimangaliso-wetland-park-ecological-risks-and-implications-for-conservation-in-a-biodiversity-hotspot
#16
Archibold Buah-Kwofie, Marc S Humphries
The iSimangaliso Wetland Park World Heritage site, located on the east coast of South Africa, spans ∼3300 km(2) and constitutes the largest protected estuarine environment for hippopotami, crocodiles and aquatic birds in Africa. Given the ecological importance of this site and continued use of organochlorine pesticides (OCPs) in the region, this study focused on the nature, distribution and potential sources of organochlorine contamination within iSimangaliso Wetland Park. OCPs were widely distributed in surface sediment samples obtained from the four main Ramsar wetland systems within the park (Lake St Lucia, Mkhuze, Lake Sibaya and Kosi Bay)...
July 17, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28727775/adolescent-health-in-rural-ghana-a-cross-sectional-study-on-the-co-occurrence-of-infectious-diseases-malnutrition-and-cardio-metabolic-risk-factors
#17
Marie Alicke, Justice K Boakye-Appiah, Inusah Abdul-Jalil, Andrea Henze, Markus van der Giet, Matthias B Schulze, Florian J Schweigert, Frank P Mockenhaupt, George Bedu-Addo, Ina Danquah
In sub-Saharan Africa, infectious diseases and malnutrition constitute the main health problems in children, while adolescents and adults are increasingly facing cardio-metabolic conditions. Among adolescents as the largest population group in this region, we investigated the co-occurrence of infectious diseases, malnutrition and cardio-metabolic risk factors (CRFs), and evaluated demographic, socio-economic and medical risk factors for these entities. In a cross-sectional study among 188 adolescents in rural Ghana, malarial infection, common infectious diseases and Body Mass Index were assessed...
2017: PloS One
https://www.readbyqxmd.com/read/28726171/qsar-modeling-docking-and-admet-studies-for-exploration-of-potential-anti-malarial-compounds-against-plasmodium-falciparum
#18
Tabish Qidwai
Development of resistance in the Plasmodium falciparum to Artemisinin, the most effective anti-malarial compound, threatens malaria elimination tactics. To gain more efficacious Artemisinin derivatives, QSAR modeling and docking was performed. In the present study, 2D-QSAR model and molecular docking were used to evaluate the Artemisinin compounds and to reveal their binding modes and structural basis of inhibitory activity. Moreover, ADMET-related descriptors have been calculated to predict the pharmacokinetic properties of the effective compounds...
December 2016: In Silico Pharmacology
https://www.readbyqxmd.com/read/28725165/cost-effectiveness-of-pre-referral-antimalarial-treatment-in-severe-malaria-among-children-in-sub-saharan-africa
#19
Vivian Rakuomi, Faith Okalebo, Stanley Ndwigah, Levi Mbugua
BACKGROUND: In 2013, 78% of malaria deaths occurred in children aged 5 years and below, in sub-Saharan Africa. Treatment of severe malaria requires a health facility with inpatient care. However, in most sub-Sahara African countries, access to health facilities is a major problem. Pre-referral antimalarial treatments aim to delay the progress of severe malaria as patients seek to access health facilities. Rectal artesunate can be administered in the community as a pre-referral treatment in rural hard-to-reach areas...
2017: Cost Effectiveness and Resource Allocation: C/E
https://www.readbyqxmd.com/read/28724450/variation-in-species-composition-and-infection-rates-of-anopheles-mosquitoes-at-different-altitudinal-transects-and-the-risk-of-malaria-in-the-highland-of-dirashe-woreda-south-ethiopia
#20
Taye Yohannes Daygena, Fekadu Massebo, Bernt Lindtjørn
BACKGROUND: The transmission of malaria is heterogeneous, and varies due to altitude. The information on whether the transmission of malaria is indigenous or imported to highland areas is scarce. Therefore, this study aimed to assess the species composition and infection rates of Anopheles at different altitudinal transects, and the risk of malaria if any in the highland of Dirashe Woreda, South Ethiopia. METHODS: This study was conducted in Gato (low altitude; average elevation of 1273 m), Onota (mid-altitude; average elevation of 1707 m) and Layignaw-Arguba (high altitude; average elevation of 2337 m) from August 2015 to April 2016...
July 19, 2017: Parasites & Vectors
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