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Malaria biomarker

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https://www.readbyqxmd.com/read/29217416/identification-of-target-proteins-of-clinical-immunity-to-plasmodium-falciparum-in-a-region-of-low-malaria-transmission
#1
Hirokazu Sakamoto, Satoru Takeo, Eizo Takashima, Kazutoyo Miura, Bernard N Kanoi, Takamasa Kaneko, Eun-Taek Han, Mayumi Tachibana, Kazuhiro Matsuoka, Jetsumon Sattabongkot, Rachanee Udomsangpetch, Tomoko Ishino, Takafumi Tsuboi
The target molecules of antibodies against falciparum malaria remain largely unknown. Recently we have identified multiple proteins as targets of immunity against Plasmodium falciparum using African serum samples. To investigate whether potential targets of clinical immunity differ with transmission intensity, we assessed immune responses in residents of low malaria transmission region in Thailand. Malaria asymptomatic volunteers (Asy: n=19) and symptomatic patients (Sym: n=21) were enrolled into the study...
December 4, 2017: Parasitology International
https://www.readbyqxmd.com/read/29206727/assessment-of-myocardial-function-and-injury-by-echocardiography-and-cardiac-biomarkers-in-african-children-with-severe-plasmodium-falciparum-malaria
#2
Simon Kotlyar, Peter Olupot-Olupot, Julius Nteziyaremye, Samuel O Akech, Sophie Uyoga, Rita Muhindo, Christopher L Moore, Kathryn Maitland
OBJECTIVES: Perturbed hemodynamic function complicates severe malaria. The Fluid Expansion as Supportive Therapy trial demonstrated that fluid resuscitation, involving children with severe malaria, was associated with increased mortality, primarily due to cardiovascular collapse, suggesting that myocardial dysfunction may have a role. The aim of this study was to characterize cardiac function in children with severe malaria. DESIGN: A prospective observational study with clinical, laboratory, and echocardiographic data collected at presentation (T0) and 24 hours (T1) in children with severe malaria...
December 4, 2017: Pediatric Critical Care Medicine
https://www.readbyqxmd.com/read/29203846/sero-catalytic-and-antibody-acquisition-models-to-estimate-differing-malaria-transmission-intensities-in-western-kenya
#3
Grace E Weber, Michael T White, Anna Babakhanyan, Peter Odada Sumba, John Vulule, Dylan Ely, Chandy John, Evelina Angov, David Lanar, Sheetij Dutta, David L Narum, Toshihiro Horii, Alan Cowman, James Beeson, Joseph Smith, James W Kazura, Arlene E Dent
We sought to identify a subset of Plasmodium falciparum antibody targets that would inform monitoring efforts needed to eliminate malaria in high transmission settings. IgG antibodies to 28 recombinant Pf antigens were measured in residents of two communities in western Kenya examined in 2003 and 2013, when the respective prevalence of asymptomatic parasitemia among children was 81 and 15 percent by microscopy. Annual seroconversion rates based on a sero-catalytic model that dichotomised antibody values to negative versus positive showed that rates were higher in 2003 than 2013 for 1 pre-erythrocytic and 7 blood-stage antigens...
December 4, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29181450/cerebrospinal-fluid-markers-to-distinguish-bacterial-meningitis-from-cerebral-malaria-in-children
#4
James M Njunge, Ian N Oyaro, Nelson K Kibinge, Martin K Rono, Symon M Kariuki, Charles R Newton, James A Berkley, Evelyn N Gitau
Background. Few hospitals in high malaria endemic countries in Africa have the diagnostic capacity for clinically distinguishing acute bacterial meningitis (ABM) from cerebral malaria (CM). As a result, empirical use of antibiotics is necessary. A biochemical marker of ABM would facilitate precise clinical diagnosis and management of these infections and enable rational use of antibiotics. Methods. We used label-free protein quantification by mass spectrometry to identify cerebrospinal fluid (CSF) markers that distinguish ABM (n=37) from CM (n=22) in Kenyan children...
2017: Wellcome Open Research
https://www.readbyqxmd.com/read/29166928/effects-of-long-term-weekly-iron-and-folic-acid-supplementation-on-lower-genital-tract-infection-a-double-blind-randomised-controlled-trial-in-burkina-faso
#5
Loretta Brabin, Stephen A Roberts, Sabine Gies, Andrew Nelson, Salou Diallo, Christopher J Stewart, Adama Kazienga, Julia Birtles, Sayouba Ouedraogo, Yves Claeys, Halidou Tinto, Umberto d'Alessandro, E Brian Faragher, Bernard Brabin
BACKGROUND: Provision of routine iron supplements to prevent anaemia could increase the risk for lower genital tract infections as virulence of some pathogens depends on iron availability. This trial in Burkina Faso assessed whether weekly periconceptional iron supplementation increased the risk of lower genital tract infection in young non-pregnant and pregnant women. METHODS: Genital tract infections were assessed within a double blind, controlled, non-inferiority trial of malaria risk among nulliparous women, randomised to receive either iron and folic acid or folic acid alone, weekly, under direct observation for 18 months...
November 23, 2017: BMC Medicine
https://www.readbyqxmd.com/read/29121448/malaria-exacerbates-inflammation-associated-elevation-in-ferritin-and-soluble-transferrin-receptor-with-only-modest-effects-on-iron-deficiency-and-iron-deficiency-anemia-among-rural-zambian-children
#6
Maxwell A Barffour, Kerry J Schulze, Christian L Coles, Justin Chileshe, Ng'andwe Kalungwana, Ward Siamusantu, Margia Arguello, William J Moss, Keith P West, Amanda C Palmer
OBJECTIVE: In 4-8-year-old Zambian children (n=744), we evaluated the effects of adjusting for inflammation (α1-acid glycoprotein > 1 g/L), with or without additional adjustment for malaria, on prevalence estimates of iron deficiency (ID) and iron deficiency anemia (IDA) during low malaria (LowM) and high malaria (HighM) transmission seasons. METHODS: To estimate adjustment factors, children were classified as: a) reference (malaria negative without inflammation), b) inflammation without malaria (I), c) malaria without inflammation (M), and d) inflammation with malaria (IM)...
November 9, 2017: Tropical Medicine & International Health: TM & IH
https://www.readbyqxmd.com/read/29119359/early-hiv-infection-among-persons-referred-for-malaria-parasite-testing-in-nigeria
#7
Babatunde A Olusola, David O Olaleye, Georgina N Odaibo
Persons in the early stages of HIV infection are the major drivers of new infections. These individuals may also develop renal dysfunctions at this time. Nigeria, as other African countries, has one of the highest prevalence of newly diagnosed HIV infections. Despite this, limited information exists on early HIV detection in the continent. This may be related to difficulties in providing early HIV diagnosis and treatment. Patients referred for malaria testing may provide a unique opportunity for early HIV detection...
November 8, 2017: Archives of Virology
https://www.readbyqxmd.com/read/29115957/towards-a-needle-free-diagnosis-of-malaria-in-vivo-identification-and-classification-of-red-and-white-blood-cells-containing-haemozoin
#8
Jennifer L Burnett, Jennifer L Carns, Rebecca Richards-Kortum
BACKGROUND: Optical detection of circulating haemozoin has been suggested as a needle free method to diagnose malaria using in vivo microscopy. Haemozoin is generated within infected red blood cells by the malaria parasite, serving as a highly specific, endogenous biomarker of malaria. However, phagocytosis of haemozoin by white blood cells which persist after the infection is resolved presents the potential for false positive diagnosis; therefore, the focus of this work is to identify a feature of the haemozoin signal to discriminate between infected red blood cells and haemozoin-containing white blood cells...
November 7, 2017: Malaria Journal
https://www.readbyqxmd.com/read/29109698/the-emerging-facets-of-non-cancerous-warburg-effect
#9
Alyaa M Abdel-Haleem, Nathan E Lewis, Neema Jamshidi, Katsuhiko Mineta, Xin Gao, Takashi Gojobori
The Warburg effect (WE), or aerobic glycolysis, is commonly recognized as a hallmark of cancer and has been extensively studied for potential anti-cancer therapeutics development. Beyond cancer, the WE plays an important role in many other cell types involved in immunity, angiogenesis, pluripotency, and infection by pathogens (e.g., malaria). Here, we review the WE in non-cancerous context as a "hallmark of rapid proliferation." We observe that the WE operates in rapidly dividing cells in normal and pathological states that are triggered by internal and external cues...
2017: Frontiers in Endocrinology
https://www.readbyqxmd.com/read/29098783/associations-of-maternal-nutrition-during-pregnancy-and-post-partum-with-maternal-cognition-and-caregiving
#10
Elizabeth L Prado, Ulla Ashorn, John Phuka, Kenneth Maleta, John Sadalaki, Brietta M Oaks, Marjorie Haskell, Lindsay H Allen, Steve A Vosti, Per Ashorn, Kathryn G Dewey
Pregnant and post-partum women require increased nutrient intake and optimal cognition, which depends on adequate nutrition, to enable reasoning and learning for caregiving. We aimed to assess (a) differences in maternal cognition and caregiving between women in Malawi who received different nutritional supplements, (b) 14 effect modifiers, and (c) associations of cognition and caregiving with biomarkers of iron, Vitamin A, B-vitamin, and fatty acid status. In a randomized controlled trial (n = 869), pregnant women daily received either multiple micronutrients (MMN), 20 g/day lipid-based nutrient supplements (LNS), or a control iron/folic acid (IFA) tablet...
November 2, 2017: Maternal & Child Nutrition
https://www.readbyqxmd.com/read/29092797/gold-nanoparticles-against-parasites-and-insect-vectors
#11
REVIEW
Giovanni Benelli
Nanomaterials are currently considered for many biological, biomedical and environmental purposes, due to their outstanding physical and chemical properties. The synthesis of gold nanoparticles (Au NPs) is of high interest for research in parasitology and entomology, since these nanomaterials showed promising applications, ranging from detection techniques to drug development, against a rather wide range of parasites of public health relevance, as well as on insect vectors. Here, I reviewed current knowledge about the bioactivity of Au NPs on selected insect species of public health relevance, including major mosquito vectors, such as Aedes aegypti, Anopheles stephensi and Culex quinquefasciatus...
October 29, 2017: Acta Tropica
https://www.readbyqxmd.com/read/29069339/is-placental-malaria-a-long-term-risk-factor-for-mild-malaria-attack-in-infancy-revisiting-a-paradigm
#12
Olivier Bouaziz, David Courtin, Gilles Cottrell, Jacqueline Milet, Gregory Nuel, André Garcia
Background: Children born to mothers with placental malaria (PM) have been described as more susceptible to the occurrence of a first malaria infection. However, whether or not these children remain more at risk during infancy has never been explored. We aimed to determine if children born to mothers with PM are more susceptible to malaria and remain at higher risk between birth and 18 months. Methods: 550 children were weekly followed-up with control of temperature and, if >37...
October 21, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/29059253/a-novel-electronic-algorithm-using-host-biomarker-point-of-care-tests-for-the-management-of-febrile-illnesses-in-tanzanian-children-e-poct-a-randomized-controlled-non-inferiority-trial
#13
RANDOMIZED CONTROLLED TRIAL
Kristina Keitel, Frank Kagoro, Josephine Samaka, John Masimba, Zamzam Said, Hosiana Temba, Tarsis Mlaganile, Willy Sangu, Clotilde Rambaud-Althaus, Alain Gervaix, Blaise Genton, Valérie D'Acremont
BACKGROUND: The management of childhood infections remains inadequate in resource-limited countries, resulting in high mortality and irrational use of antimicrobials. Current disease management tools, such as the Integrated Management of Childhood Illness (IMCI) algorithm, rely solely on clinical signs and have not made use of available point-of-care tests (POCTs) that can help to identify children with severe infections and children in need of antibiotic treatment. e-POCT is a novel electronic algorithm based on current evidence; it guides clinicians through the entire consultation and recommends treatment based on a few clinical signs and POCT results, some performed in all patients (malaria rapid diagnostic test, hemoglobin, oximeter) and others in selected subgroups only (C-reactive protein, procalcitonin, glucometer)...
October 2017: PLoS Medicine
https://www.readbyqxmd.com/read/29057138/detection-of-plasmodium-aldolase-using-a-smartphone-and-microfluidic-enzyme-linked-immunosorbent-assay
#14
Nikhil S Gopal, Ruben Raychaudhuri
BACKGROUND: Malaria control efforts are limited in rural areas. A low-cost system to monitor response without the use of electricity is needed. Plasmodium aldolase is a malaria biomarker measured using enzyme linked immunosorbent assay (ELISA) techniques. A three-part system using ELISA was developed consisting of a microfluidic chip, hand crank centrifuge, and a smartphone. METHODS: A circular microfluidic chip was fabricated using clear acrylic and a CO2 laser...
2017: Malaria Research and Treatment
https://www.readbyqxmd.com/read/29032164/a-portable-microfluidic-aptamer-tethered-enzyme-capture-aptec-biosensor-for-malaria-diagnosis
#15
Lewis A Fraser, Andrew B Kinghorn, Roderick M Dirkzwager, Shaolin Liang, Yee-Wai Cheung, Bryce Lim, Simon Chi-Chin Shiu, Marco S L Tang, Dean Andrew, Joseph Manitta, Jack S Richards, Julian A Tanner
There is a critical need for better biosensors for the detection and diagnosis of malaria. We previously developed a DNA aptamer that recognises the Plasmodium falciparum lactate dehydrogenase (PfLDH) enzyme with high sensitivity and specificity. The aptamer was integrated into an Aptamer-Tethered Enzyme Capture (APTEC) assay as a laboratory-based diagnostic approach. However, a portable equipment-free point-of-care aptamer-mediated biosensor could have a significant impact on malaria diagnosis in endemic regions...
October 4, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28982133/simultaneous-assessment-of-iodine-iron-vitamin-a-malarial-antigenemia-and-inflammation-status-biomarkers-via-a-multiplex-immunoassay-method-on-a-population-of-pregnant-women-from-niger
#16
Eleanor Brindle, Lorraine Lillis, Rebecca Barney, Sonja Y Hess, K Ryan Wessells, Césaire T Ouédraogo, Sara Stinca, Michael Kalnoky, Roger Peck, Abby Tyler, Christopher Lyman, David S Boyle
Deficiencies of vitamin A, iron, and iodine are major public health concerns in many low- and middle-income countries, but information on their status in populations is often lacking due to high costs and logistical challenges associated with assessing micronutrient status. Accurate, user-friendly, and low-cost analytical tools are needed to allow large-scale population surveys on micronutrient status. We present the expansion of a 7-plex protein microarray tool for the simultaneous measurement of up to seven biomarkers with relevance to the assessment of the key micronutrients iron, iodine, and vitamin A, and inflammation and malaria biomarkers: α-1-acid glycoprotein, C-reactive protein, ferritin, retinol binding protein 4, soluble transferrin receptor, thyroglobulin, and histidine-rich protein II...
2017: PloS One
https://www.readbyqxmd.com/read/28969365/evidence-for-potential-underestimation-of-clinical-folate-deficiency-in-resource-limited-countries-using-blood-tests
#17
Asok C Antony
Although a low serum folate concentration is a useful biomarker of pure folate deficiency, the presence of vitamin B12 deficiency or hemolysis or both in individuals with low folate status predictably raises serum folate levels. Therefore, in resource-limited settings where dietary folate deficiency can coexist with vitamin B12 deficiency or malaria or both, the serum folate concentration can range from normal to high, leading to serious underestimation of tissue folate status. This review traces the genesis of an inappropriate overreliance on the serum folate concentration to rule out folate deficiency in vulnerable populations of women and children...
August 1, 2017: Nutrition Reviews
https://www.readbyqxmd.com/read/28968664/a-novel-gametocyte-biomarker-for-superior-molecular-detection-of-the-plasmodium-falciparum-infectious-reservoirs
#18
Edward Essuman, Bryan Grabias, Nitin Verma, Joanna K Chorazeczewski, Abhai K Tripathi, Godfree Mlambo, Ebenezer A Addison, Albert G B Amoah, Isabella Quakyi, Miranda S Oakley, Sanjai Kumar
Background: Complete malaria eradication and optimal use of transmission-reducing interventions requires knowledge of submicroscopic infectious reservoirs among asymptomatic individuals. Even sub-microscopic levels of Plasmodium falciparum gametocytes can infect mosquitoes and promote onward transmission. Most efforts to identify gametocyte carriers utilize PCR amplification of the gametocyte-specific transcript Pfs25. Methods: To expand the repertoire of biomarkers available for superior gametocyte detection, we compared the gene expression profiles of gametocytes versus asynchronous blood stage P...
August 24, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28965490/study-roadmap-for-high-throughput-development-of-easy-to-use-and-affordable-biomarkers-as-diagnostics-for-tropical-diseases-a-focus-on-malaria-and-schistosomiasis
#19
Kokouvi Kassegne, Ting Zhang, Shen-Bo Chen, Bin Xu, Zhi-Sheng Dang, Wang-Ping Deng, Eniola Michael Abe, Hai-Mo Shen, Wei Hu, Takele Geressu Guyo, Solomon Nwaka, Jun-Hu Chen, Xiao-Nong Zhou
BACKGROUND: Interventions are currently being used against 'infectious diseases of poverty', which remain highly debilitating and deadly in most endemic countries, especially malaria, schistosomiasis, echinococcosis and African sleeping sickness. However, major limitations of current 'traditional' methods for diagnosis are neither simple nor convenient for population surveillance, and showed low sensitivity and specificity. Access to novel technologies for the development of adequate and reliable tools are expressly needed...
October 2, 2017: Infectious Diseases of Poverty
https://www.readbyqxmd.com/read/28946883/igg-antibodies-to-synthetic-gpi-are-biomarkers-of-immune-status-to-both-plasmodium-falciparum-and-plasmodium-vivax-malaria-in-young-children
#20
Camila T França, Connie S N Li Wai Suen, Amandine Carmagnac, Enmoore Lin, Benson Kiniboro, Peter Siba, Louis Schofield, Ivo Mueller
BACKGROUND: Further reduction in malaria prevalence and its eventual elimination would be greatly facilitated by the development of biomarkers of exposure and/or acquired immunity to malaria, as well as the deployment of effective vaccines against Plasmodium falciparum and Plasmodium vivax. A better understanding of the acquisition of immunity in naturally-exposed populations is essential for the identification of antigens useful as biomarkers, as well as to inform rational vaccine development...
September 25, 2017: Malaria Journal
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