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Aninagyei E, Deku JG, Yemofio KT, Quainoo E, Ntiri KA, Yaro E, Essandoh P, Agbogli HK, Asmah RH. Comparative evaluation of the diagnostic accuracies of four different malaria rapid diagnostic test kits available in Ghana. PLoS One 2024; 19:e0302840. [PMID: 38713676 PMCID: PMC11075830 DOI: 10.1371/journal.pone.0302840] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2023] [Accepted: 04/14/2024] [Indexed: 05/09/2024] Open
Abstract
Malaria rapid diagnostic test (mRDT) kit is one of the techniques for diagnosing malaria. Due to its inherent advantages over the microscopy technique, several brands of the kit have flooded malaria endemic countries, without prior in-country evaluation. Two of such mRDT kits are Oscar (India) and Standard Q (Korea Republic). In this study, the performance of Oscar and Standard Q mRDT kits were compared to First Response (India) and CareStart (USA) mRDTs, which have been evaluated and deployed for use approved by the Ministry of Health (MOH). In this comparative study, whole blood samples were collected from patients suspected of malaria. Plasmodium falciparum was detected in each sample using nested polymerase chain reaction (nPCR), microscopy and the four mRDTs. The sensitivities, specificities, accuracies, positive and negative predictive values and accuracies of the mRDTs were determined using nPCR as a reference technique. Kappa statistic was used to determine the level of agreement among the techniques. Two hundred (200) blood samples were analyzed in this study. The overall detection rates of P. falciparum by microscopy, First Response, CareStart, Oscar-PfHRP2, Standard Q mRDT kits and nPCR were 31.5%, 34.5%, 33.5%, 32%, 31% and 43% (x2 = 6.1, p = 0.046), respectively. The accuracies of CareStart and First Response were comparable (90.5% vs. 89.5%). Further, comparing their sensitivities, Oscar-PfHRP2 was 74.4% (95% confidence interval (CI): 63.9-83.2) while that of Standard Q was 72.1% (95% CI: 61.4-81.2), with comparable accuracies (Oscar-PfHRP2-89% and Standard Q -88%). Apart from First Response that was 98.3% specific, the others were 100% specific. Kappa test revealed perfect diagnostic agreement (κ = 0.90-0.98) among the four mRDTs. That notwithstanding, Oscar-PfHRP2 agreed better with CareStart (κ = 0.94) and First Response (κ = 0.92) compared to the agreement between Standard Q and, CareStart (κ = 0.92) and First Response (κ = 0.90). Taken together, the diagnostic performance of the four mRDT kits were statistically similar. That notwithstanding, new mRDT kits should be evaluated prior to deployment for use.
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Affiliation(s)
- Enoch Aninagyei
- Department of Biomedical Sciences, School of Basic and Biomedical Sciences, University of Health and Allied Sciences, Ho, Ghana
| | - John Gameli Deku
- Department of Medical Laboratory Sciences, School of Allied Health Sciences, University of Health and Allied Sciences, Ho, Ghana
| | - Keren Trishia Yemofio
- Department of Biomedical Sciences, School of Basic and Biomedical Sciences, University of Health and Allied Sciences, Ho, Ghana
| | - Ekua Quainoo
- Department of Biomedical Sciences, School of Basic and Biomedical Sciences, University of Health and Allied Sciences, Ho, Ghana
| | - Kofi Adjei Ntiri
- Ghana Health Service, Amamorley Health Center, Ga North Municipality, Greater Accra Region, Ghana
| | - Evelyn Yaro
- Ghana Health Service, Ga North Municipal Health Directorate, Ofankor-Accra, Ghana
| | - Priscilla Essandoh
- Department of Biomedical Sciences, School of Basic and Biomedical Sciences, University of Health and Allied Sciences, Ho, Ghana
| | - Hubert Kwame Agbogli
- Department of Biomedical Sciences, School of Basic and Biomedical Sciences, University of Health and Allied Sciences, Ho, Ghana
| | - Richard Harry Asmah
- Department of Biomedical Sciences, School of Basic and Biomedical Sciences, University of Health and Allied Sciences, Ho, Ghana
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Kim YJ, Choi JW. Enzyme-linked aptamer-based sandwich assay (ELASA) for detecting Plasmodium falciparum lactate dehydrogenase, a malarial biomarker. RSC Adv 2022; 12:29535-29542. [PMID: 36320752 PMCID: PMC9562052 DOI: 10.1039/d2ra03796c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2022] [Accepted: 10/08/2022] [Indexed: 01/24/2023] Open
Abstract
Herein, we report a sensitive and selective enzyme-linked aptamer-based sandwich assay (ELASA) to detect Plasmodium falciparum lactate dehydrogenase (PfLDH), which is an attractive biomarker for malaria diagnosis and antimalarial medication. We performed the sandwich assay with a single aptamer sequence, called 2008s, owing to the structural properties of the PfLDH tetramer instead of using a conventional sandwich assay with two different aptamers (or antibodies) for capturing and probing a target molecule. First, the biotinylated PfLDH aptamer was linked with immobilized streptavidin on a microwell plate for binding flexibility, and then PfLDH was bound to the aptamer. Next, a horseradish peroxidase-conjugated aptamer of the same sequence was used to analyze PfLDH quantitatively. Using this approach, the limit of detection (LOD) of PfLDH with the naked eye was 100 ng mL-1, and the LOD and limit of quantification from the absorbance measurements were 34.9 ng mL-1 and 95.5 ng mL-1, respectively, based on PfLDH spiked blood samples. Our proposed method selectively binds PfLDH, not human lactate dehydrogenase. Therefore, this method may be a valuable tool for diagnosing, monitoring, and quarantining malaria cases easily and rapidly.
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Affiliation(s)
- Yeon-Jun Kim
- Department of Biomedical Science, Cheongju UniversityCheongju 28160Republic of Korea
| | - Jae-Won Choi
- Department of Biomedical Science, Cheongju UniversityCheongju 28160Republic of Korea,Department of Bioindustrial EngineeringCheongju 28503Republic of Korea
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Arias-Alpízar K, Sánchez-Cano A, Prat-Trunas J, Sulleiro E, Bosch-Nicolau P, Salvador F, Oliveira I, Molina I, Sánchez-Montalvá A, Baldrich E. Magnetic Bead Handling Using a Paper-Based Device for Quantitative Point-of-Care Testing. BIOSENSORS 2022; 12:680. [PMID: 36140066 PMCID: PMC9496280 DOI: 10.3390/bios12090680] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/26/2022] [Revised: 08/18/2022] [Accepted: 08/20/2022] [Indexed: 06/16/2023]
Abstract
Microfluidic paper-based analytical devices (μPADs) have been extensively proposed as ideal tools for point-of-care (POC) testing with minimal user training and technical requirements. However, most μPADs use dried bioreagents, which complicate production, reduce device reproducibility and stability, and require transport and storage under temperature and humidity-controlled conditions. In this work, we propose a μPAD produced using an affordable craft-cutter and stored at room temperature, which is used to partially automate a single-step colorimetric magneto-immunoassay. As a proof-of-concept, the μPAD has been applied to the quantitative detection of Plasmodium falciparum lactate dehydrogenase (Pf-LDH), a biomarker of malaria infection. In this system, detection is based on a single-step magneto-immunoassay that consists of a single 5-min incubation of the lysed blood sample with immuno-modified magnetic beads (MB), detection antibody, and an enzymatic signal amplifier (Poly-HRP). This mixture is then transferred to a single-piece paper device where, after on-chip MB magnetic concentration and washing, signal generation is achieved by adding a chromogenic enzyme substrate. The colorimetric readout is achieved by the naked eye or using a smartphone camera and free software for image analysis. This μPAD afforded quantitative Pf-LDH detection in <15 min, with a detection limit of 6.25 ng mL−1 when the result was interpreted by the naked eye and 1.4 ng mL−1 when analysed using the smartphone imaging system. Moreover, the study of a battery of clinical samples revealed concentrations of Pf-LDH that correlated with those provided by the reference ELISA and with better sensitivity than a commercial rapid diagnostic test (RDT). These results demonstrate that magneto-immunoassays can be partly automated by employing a μPAD, achieving a level of handling that approaches the requirements of POC testing.
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Affiliation(s)
- Kevin Arias-Alpízar
- Diagnostic Nanotools Group, Vall d’Hebron Institut de Recerca (VHIR), 08035 Barcelona, Spain
- Universitat Autònoma de Barcelona (UAB), 08193 Barcelona, Spain
| | - Ana Sánchez-Cano
- Diagnostic Nanotools Group, Vall d’Hebron Institut de Recerca (VHIR), 08035 Barcelona, Spain
- Universitat Autònoma de Barcelona (UAB), 08193 Barcelona, Spain
| | - Judit Prat-Trunas
- Diagnostic Nanotools Group, Vall d’Hebron Institut de Recerca (VHIR), 08035 Barcelona, Spain
| | - Elena Sulleiro
- Universitat Autònoma de Barcelona (UAB), 08193 Barcelona, Spain
- International Health Unit Vall d’Hebron-Drassanes, Vall d’Hebron Hospital Universitari, PROSICS Barcelona, 08035 Barcelona, Spain
- Centro de Investigación Biomédica en Red de Enfermedades Infecciosas (CIBERINFEC), Instituto de Salud Carlos III, 28028 Madrid, Spain
| | - Pau Bosch-Nicolau
- International Health Unit Vall d’Hebron-Drassanes, Vall d’Hebron Hospital Universitari, PROSICS Barcelona, 08035 Barcelona, Spain
- Centro de Investigación Biomédica en Red de Enfermedades Infecciosas (CIBERINFEC), Instituto de Salud Carlos III, 28028 Madrid, Spain
| | - Fernando Salvador
- International Health Unit Vall d’Hebron-Drassanes, Vall d’Hebron Hospital Universitari, PROSICS Barcelona, 08035 Barcelona, Spain
- Centro de Investigación Biomédica en Red de Enfermedades Infecciosas (CIBERINFEC), Instituto de Salud Carlos III, 28028 Madrid, Spain
| | - Inés Oliveira
- International Health Unit Vall d’Hebron-Drassanes, Vall d’Hebron Hospital Universitari, PROSICS Barcelona, 08035 Barcelona, Spain
- Centro de Investigación Biomédica en Red de Enfermedades Infecciosas (CIBERINFEC), Instituto de Salud Carlos III, 28028 Madrid, Spain
| | - Israel Molina
- International Health Unit Vall d’Hebron-Drassanes, Vall d’Hebron Hospital Universitari, PROSICS Barcelona, 08035 Barcelona, Spain
- Centro de Investigación Biomédica en Red de Enfermedades Infecciosas (CIBERINFEC), Instituto de Salud Carlos III, 28028 Madrid, Spain
| | - Adrián Sánchez-Montalvá
- Universitat Autònoma de Barcelona (UAB), 08193 Barcelona, Spain
- International Health Unit Vall d’Hebron-Drassanes, Vall d’Hebron Hospital Universitari, PROSICS Barcelona, 08035 Barcelona, Spain
- Centro de Investigación Biomédica en Red de Enfermedades Infecciosas (CIBERINFEC), Instituto de Salud Carlos III, 28028 Madrid, Spain
| | - Eva Baldrich
- Diagnostic Nanotools Group, Vall d’Hebron Institut de Recerca (VHIR), 08035 Barcelona, Spain
- Centro de Investigación Biomédica en Red de Enfermedades Infecciosas (CIBERINFEC), Instituto de Salud Carlos III, 28028 Madrid, Spain
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de la Serna E, Arias-Alpízar K, Borgheti-Cardoso LN, Sanchez-Cano A, Sulleiro E, Zarzuela F, Bosch-Nicolau P, Salvador F, Molina I, Ramírez M, Fernàndez-Busquets X, Sánchez-Montalvá A, Baldrich E. Detection of Plasmodium falciparum malaria in 1 h using a simplified enzyme-linked immunosorbent assay. Anal Chim Acta 2021; 1152:338254. [PMID: 33648654 DOI: 10.1016/j.aca.2021.338254] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Revised: 01/21/2021] [Accepted: 01/24/2021] [Indexed: 12/21/2022]
Abstract
Malaria is a parasitic disease caused by protists of the genus Plasmodium, which are transmitted to humans through the bite of infected female Anopheles mosquitoes. Analytical methodologies and efficient drugs exist for the early detection and treatment of malaria, and yet this disease continues infecting millions of people and claiming several hundred thousand lives each year. One of the reasons behind this failure to control the disease is that the standard method for malaria diagnosis, microscopy, is time-consuming and requires trained personnel. Alternatively, rapid diagnostic tests, which have become common for point-of-care testing thanks to their simplicity of use, tend to be insufficiently sensitive and reliable, and PCR, which is sensitive, is too complex and expensive for massive population screening. In this work, we report a sensitive simplified ELISA for the quantitation of Plasmodium falciparum lactate dehydrogenase (Pf-LDH), which is capable of detecting malaria in 45-60 min. Assay development was founded in the selection of high-performance antibodies, implementation of a poly-horseradish peroxidase (polyHRP) signal amplifier, and optimization of whole-blood sample pre-treatment. The simplified ELISA achieved limits of detection (LOD) and quantification (LOQ) of 0.11 ng mL-1 and 0.37 ng mL-1, respectively, in lysed whole blood, and an LOD comparable to that of PCR in Plasmodium in vitro cultures (0.67 and 1.33 parasites μL-1 for ELISA and PCR, respectively). Accordingly, the developed immunoassay represents a simple and effective diagnostic tool for P. falciparum malaria, with a time-to-result of <60 min and sensitivity similar to the reference PCR, but easier to implement in low-resource settings.
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Affiliation(s)
- Erica de la Serna
- Diagnostic Nanotools Group, CIBBIM-Nanomedicine, Vall d'Hebron Institut de Recerca (VHIR), Vall d'Hebron Barcelona Hospital Campus, Barcelona, Spain
| | - Kevin Arias-Alpízar
- Diagnostic Nanotools Group, CIBBIM-Nanomedicine, Vall d'Hebron Institut de Recerca (VHIR), Vall d'Hebron Barcelona Hospital Campus, Barcelona, Spain; Universitat Autònoma de Barcelona (UAB), Bellaterra, Spain
| | - Livia Neves Borgheti-Cardoso
- Nanomalaria Group, Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute of Science and Technology (BIST), Barcelona, Spain; Barcelona Institute for Global Health (ISGlobal, Hospital Clínic-Universitat de Barcelona), Barcelona, Spain
| | - Ana Sanchez-Cano
- Diagnostic Nanotools Group, CIBBIM-Nanomedicine, Vall d'Hebron Institut de Recerca (VHIR), Vall d'Hebron Barcelona Hospital Campus, Barcelona, Spain; Universitat Autònoma de Barcelona (UAB), Bellaterra, Spain
| | - Elena Sulleiro
- Universitat Autònoma de Barcelona (UAB), Bellaterra, Spain; Microbiology Department, Vall d'Hebron Hospital Universitari, Vall d'Hebron Barcelona Hospital Campus, Barcelona, Spain; PROSICS (Catalan International Health Program), Barcelona, Spain
| | - Francesc Zarzuela
- Microbiology Department, Vall d'Hebron Hospital Universitari, Vall d'Hebron Barcelona Hospital Campus, Barcelona, Spain; PROSICS (Catalan International Health Program), Barcelona, Spain
| | - Pau Bosch-Nicolau
- PROSICS (Catalan International Health Program), Barcelona, Spain; Infectious Diseases Department, Vall d'Hebron Hospital Universitari, Vall d'Hebron Barcelona Hospital Campus, Barcelona, Spain
| | - Fernando Salvador
- PROSICS (Catalan International Health Program), Barcelona, Spain; Infectious Diseases Department, Vall d'Hebron Hospital Universitari, Vall d'Hebron Barcelona Hospital Campus, Barcelona, Spain
| | - Israel Molina
- PROSICS (Catalan International Health Program), Barcelona, Spain; Infectious Diseases Department, Vall d'Hebron Hospital Universitari, Vall d'Hebron Barcelona Hospital Campus, Barcelona, Spain
| | - Miriam Ramírez
- Barcelona Institute for Global Health (ISGlobal, Hospital Clínic-Universitat de Barcelona), Barcelona, Spain
| | - Xavier Fernàndez-Busquets
- Nanomalaria Group, Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute of Science and Technology (BIST), Barcelona, Spain; Barcelona Institute for Global Health (ISGlobal, Hospital Clínic-Universitat de Barcelona), Barcelona, Spain; Nanoscience and Nanotechnology Institute, Universitat de Barcelona (IN2UB), Barcelona, Spain
| | - Adrián Sánchez-Montalvá
- Universitat Autònoma de Barcelona (UAB), Bellaterra, Spain; PROSICS (Catalan International Health Program), Barcelona, Spain; Infectious Diseases Department, Vall d'Hebron Hospital Universitari, Vall d'Hebron Barcelona Hospital Campus, Barcelona, Spain
| | - Eva Baldrich
- Diagnostic Nanotools Group, CIBBIM-Nanomedicine, Vall d'Hebron Institut de Recerca (VHIR), Vall d'Hebron Barcelona Hospital Campus, Barcelona, Spain; CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Spain.
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Bekoe ANA, Allotey EA, Akorsu EE, Abaka-Yawson A, Adusei S, Kpene GE, Kwadzokpui PK. Inter-rater Variability in Malaria Microscopy at the LEKMA Hospital, Ghana. J Parasitol Res 2020; 2020:8897337. [PMID: 33489321 PMCID: PMC7787828 DOI: 10.1155/2020/8897337] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2020] [Revised: 11/09/2020] [Accepted: 11/26/2020] [Indexed: 11/17/2022] Open
Abstract
BACKGROUND Malaria remains a major cause of morbidity and mortality worldwide and particularly in sub-Saharan Africa where it is endemic. As such, it is important that a proper diagnosis is made before treatment is initiated. Malaria parasite count plays a key role in the diagnosis and management of malaria. Variations in ratings by laboratory personnel can impact negatively on the treatment regimen for malaria-infected patients. The study is thus aimed at evaluating and comparing the proficiency and parasitaemia counts by two different categories of laboratory staff at the LEKMA Hospital, Ghana. MATERIALS AND METHODS A total of 200 confirmed malaria-positive samples were used in the study. Six thick and thin films were prepared from each sample and uniquely labelled. Two of the six slides were given to two WHO-accredited malaria microscopists to examine and report their respective parasite count/μl (parasite count/WBC × 8000). These were used as the reference for the two categories of laboratory staffs: rater A being diploma holders (Technical Officers referred to as untrained rater) and rater B being degree holders (Medical Laboratory Scientist referred to as trained rater) at the LEKMA Hospital. RESULTS In comparison to the expected outcome, the parasite count by the rater group A (190 (151-239)]) and the rater group B (177 (140-224)) demonstrated significant positive correlation (r = 0.995, p < 0.0001 vs. r = 0.995, p < 0.0001, respectively) with the expected outcome in the cases of heavy parasitaemia. A statistically significant difference (p < 0.05) between counts by the different raters in low parasitemia was observed in this study. A persistent nosedive inter-rater agreement from k = 0.82 to k = 0.40 with increasing density cutoff was observed in this study. CONCLUSION The study observed that the degree of inter-rater agreement of parasite density count by various categories of laboratory personnel is almost perfect. However, the parasite count between raters varied significantly with very low levels of parasitemia but better correlated with heavy parasitemia.
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Affiliation(s)
- Andrew Nii Adzei Bekoe
- Department of Medical Laboratory Sciences, School of Allied Health Sciences, University of Health and Allied Sciences, Ho, Ghana
- Laboratory Department, Ledzokuku Krowor Municipal Assembly (LEKMA) Hospital, Accra, Ghana
| | - Emmanuel Alote Allotey
- Department of Medical Laboratory Sciences, School of Allied Health Sciences, University of Health and Allied Sciences, Ho, Ghana
| | - Elliot Elikplim Akorsu
- Department of Medical Laboratory Sciences, School of Allied Health Sciences, University of Health and Allied Sciences, Ho, Ghana
| | - Albert Abaka-Yawson
- Department of Medical Laboratory Sciences, School of Allied Health Sciences, University of Health and Allied Sciences, Ho, Ghana
| | - Samuel Adusei
- Department of Obstetrics and Gynaecology, University of Cape Town, Cape Town, South Africa
| | - Godsway Edem Kpene
- Department of Medical Laboratory Sciences, School of Allied Health Sciences, University of Health and Allied Sciences, Ho, Ghana
| | - Precious Kwablah Kwadzokpui
- Department of Medical Laboratory Sciences, School of Allied Health Sciences, University of Health and Allied Sciences, Ho, Ghana
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An internet of things-based intensity and time-resolved fluorescence reader for point-of-care testing. Biosens Bioelectron 2020; 154:112074. [PMID: 32056969 DOI: 10.1016/j.bios.2020.112074] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Revised: 01/10/2020] [Accepted: 02/03/2020] [Indexed: 11/24/2022]
Abstract
A miniature internet of things (IoT)-based point-of-care testing (PoCT) fluorescence reader, able to perform both intensity and time-resolved measurements of different fluorescent tags, is presented. This low cost platform has been conceived for performing tests in low-resource and remote settings, displaying versatile performance and yet simple operation. It consists on an external case of 43 × 30 × 42 mm3 (built in a 3D-printer) where all the elements are fixed, including some basic optics (3 lenses and 2 filters), a laser diode and a custom designed Single-Photon Avalanche Diodes (SPADs) camera. Both, the laser and the camera are controlled by a Field Programmable Gate Array (FPGA) with IoT capabilities. The PoCT was validated by detecting Plasmodium antigen in a fluorescent enzyme-linked immunosorbent assay (ELISA) using a fluorescence substrate. The results were compared to those provided in parallel by two commercial fluorescent plate readers. As it will be shown, the PoCT fluorescent readout was more sensitive than its colorimetric counterpart. Furthermore, the PoCT displayed similar signal trends and levels of detection than the bulkier and more expensive commercial fluorescence plate readers. These results demonstrate that the PoCT platform developed could bring the performance of central laboratory assay techniques closer to the end-user level.
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Margueritte L, Duciel L, Bourjot M, Vonthron-Sénécheau C, Delsuc MA. Automatised pharmacophoric deconvolution of plant extracts - application to Cinchona bark crude extract. Faraday Discuss 2019; 218:441-458. [PMID: 31120045 DOI: 10.1039/c8fd00242h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We present a development of the "Plasmodesma" dereplication method [Margueritte et al., Magn. Reson. Chem., 2018, 56, 469]. This method is based on the automatic acquisition of a standard set of NMR experiments from a medium sized set of samples differing by their bioactivity. From this raw data, an analysis pipeline is run and the data is analysed by leveraging machine learning approaches in order to extract the spectral fingerprints of the active compounds. The optimal conditions for the analysis are determined and tested on two different systems, a synthetic sample where a single active molecule is to be isolated and characterized, and a complex bioactive matrix with synergetic interactions between the components. The method allows the identification of the active compounds and performs a pharmacophoric deconvolution. The program is freely available on the Internet, with an interactive visualisation of the statistical analysis, at https://plasmodesma.igbmc.science.
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Affiliation(s)
- Laure Margueritte
- Laboratoire d'Innovation Thérapeutique (LIT), UMR CNRS 7200, LabEx Medalis, Faculté de Pharmacie, Université de Strasbourg, Illkirch-Graffenstaden, France
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Plucinski MM, Herman C, Jones S, Dimbu R, Fortes F, Ljolje D, Lucchi N, Murphy SC, Smith NT, Cruz KR, Seilie AM, Halsey ES, Udhayakumar V, Aidoo M, Rogier E. Screening for Pfhrp2/3-Deleted Plasmodium falciparum, Non-falciparum, and Low-Density Malaria Infections by a Multiplex Antigen Assay. J Infect Dis 2019; 219:437-447. [PMID: 30202972 PMCID: PMC6325347 DOI: 10.1093/infdis/jiy525] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2018] [Accepted: 08/30/2018] [Indexed: 11/13/2022] Open
Abstract
Background Detection of Plasmodium antigens provides evidence of malaria infection status and is the basis for most malaria diagnosis. Methods We developed a sensitive bead-based multiplex assay for laboratory use, which simultaneously detects pan-Plasmodium aldolase (pAldo), pan-Plasmodium lactate dehydrogenase (pLDH), and P. falciparum histidine-rich protein 2 (PfHRP2) antigens. The assay was validated against purified recombinant antigens, monospecies malaria infections, and noninfected blood samples. To test against samples collected in an endemic setting, Angolan outpatient samples (n = 1267) were assayed. Results Of 466 Angolan samples positive for at least 1 antigen, the most common antigen profiles were PfHRP2+/pAldo+/pLDH+ (167, 36%), PfHRP2+/pAldo-/pLDH- (163, 35%), and PfHRP2+/pAldo+/pLDH- (129, 28%). Antigen profile was predictive of polymerase chain reaction (PCR) positivity and parasite density. Eight Angolan samples (1.7%) had no or very low PfHRP2 but were positive for 1 or both of the other antigens. PCR analysis confirmed 3 (0.6%) were P. ovale infections and 2 (0.4%) represented P. falciparum parasites lacking Pfhrp2 and/or Pfhrp3. Conclusions These are the first reports of Pfhrp2/3 deletion mutants in Angola. High-throughput multiplex antigen detection can inexpensively screen for low-density P. falciparum, non-falciparum, and Pfhrp2/3-deleted parasites to provide population-level antigen estimates and identify specimens requiring further molecular characterization.
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Affiliation(s)
- Mateusz M Plucinski
- Malaria Branch, Division of Parasitic Diseases and Malaria, Centers for Disease Control and Prevention, Atlanta, Georgia
- US President’s Malaria Initiative, Centers for Disease Control and Prevention, Atlanta, Georgia
| | - Camelia Herman
- Malaria Branch, Division of Parasitic Diseases and Malaria, Centers for Disease Control and Prevention, Atlanta, Georgia
- CDC Foundation, Atlanta, Georgia
| | - Sophie Jones
- Malaria Branch, Division of Parasitic Diseases and Malaria, Centers for Disease Control and Prevention, Atlanta, Georgia
- Atlanta Research and Education Foundation, Georgia
| | - Rafael Dimbu
- National Malaria Control Program, Ministry of Health, Luanda, Angola
| | - Filomeno Fortes
- National Malaria Control Program, Ministry of Health, Luanda, Angola
| | - Dragan Ljolje
- Malaria Branch, Division of Parasitic Diseases and Malaria, Centers for Disease Control and Prevention, Atlanta, Georgia
- Atlanta Research and Education Foundation, Georgia
| | - Naomi Lucchi
- Malaria Branch, Division of Parasitic Diseases and Malaria, Centers for Disease Control and Prevention, Atlanta, Georgia
| | - Sean C Murphy
- Department of Laboratory Medicine, University of Washington, Seattle
- Center for Emerging and Re-emerging Infectious Diseases, University of Washington, Seattle
| | - Nahum T Smith
- Department of Laboratory Medicine, University of Washington, Seattle
| | - Kurtis R Cruz
- Department of Laboratory Medicine, University of Washington, Seattle
| | - Annette M Seilie
- Department of Laboratory Medicine, University of Washington, Seattle
| | - Eric S Halsey
- Malaria Branch, Division of Parasitic Diseases and Malaria, Centers for Disease Control and Prevention, Atlanta, Georgia
- US President’s Malaria Initiative, Centers for Disease Control and Prevention, Atlanta, Georgia
| | - Venkatachalam Udhayakumar
- Malaria Branch, Division of Parasitic Diseases and Malaria, Centers for Disease Control and Prevention, Atlanta, Georgia
| | - Michael Aidoo
- Malaria Branch, Division of Parasitic Diseases and Malaria, Centers for Disease Control and Prevention, Atlanta, Georgia
| | - Eric Rogier
- Malaria Branch, Division of Parasitic Diseases and Malaria, Centers for Disease Control and Prevention, Atlanta, Georgia
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Margueritte L, Markov P, Chiron L, Starck JP, Vonthron-Sénécheau C, Bourjot M, Delsuc MA. Automatic differential analysis of NMR experiments in complex samples. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2018; 56:469-479. [PMID: 29152789 DOI: 10.1002/mrc.4683] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2017] [Revised: 10/20/2017] [Accepted: 11/03/2017] [Indexed: 06/07/2023]
Abstract
Liquid state nuclear magnetic resonance (NMR) is a powerful tool for the analysis of complex mixtures of unknown molecules. This capacity has been used in many analytical approaches: metabolomics, identification of active compounds in natural extracts, and characterization of species, and such studies require the acquisition of many diverse NMR measurements on series of samples. Although acquisition can easily be performed automatically, the number of NMR experiments involved in these studies increases very rapidly, and this data avalanche requires to resort to automatic processing and analysis. We present here a program that allows the autonomous, unsupervised processing of a large corpus of 1D, 2D, and diffusion-ordered spectroscopy experiments from a series of samples acquired in different conditions. The program provides all the signal processing steps, as well as peak-picking and bucketing of 1D and 2D spectra, the program and its components are fully available. In an experiment mimicking the search of a bioactive species in a natural extract, we use it for the automatic detection of small amounts of artemisinin added to a series of plant extracts and for the generation of the spectral fingerprint of this molecule. This program called Plasmodesma is a novel tool that should be useful to decipher complex mixtures, particularly in the discovery of biologically active natural products from plants extracts but can also in drug discovery or metabolomics studies.
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Affiliation(s)
- Laure Margueritte
- Laboratoire d'Innovation Thérapeutique (LIT) UMR CNRS 7200, LabEx Medalis, Faculté de Pharmacie, Université de Strasbourg, Strasbourg, France
| | - Petar Markov
- Structural Biophysics Group, School of Optometry and Vision Sciences, Cardiff University, Cardiff, UK
| | - Lionel Chiron
- CASC4DE Le Lodge, 20, Avenue du Neuhof, Strasbourg 67100, France
| | | | - Catherine Vonthron-Sénécheau
- Laboratoire d'Innovation Thérapeutique (LIT) UMR CNRS 7200, LabEx Medalis, Faculté de Pharmacie, Université de Strasbourg, Strasbourg, France
| | - Mélanie Bourjot
- Laboratoire d'Innovation Thérapeutique (LIT) UMR CNRS 7200, LabEx Medalis, Faculté de Pharmacie, Université de Strasbourg, Strasbourg, France
| | - Marc-André Delsuc
- Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), INSERM U596, CNRS UMR 7104, Université de Strasbourg, Strasbourg, France
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10
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Kwenti TE, Njunda LA, Tsamul B, Nsagha SD, Assob NJC, Tufon KA, Meriki DH, Orock EG. Comparative evaluation of a rapid diagnostic test, an antibody ELISA, and a pLDH ELISA in detecting asymptomatic malaria parasitaemia in blood donors in Buea, Cameroon. Infect Dis Poverty 2017; 6:103. [PMID: 28760158 PMCID: PMC5537946 DOI: 10.1186/s40249-017-0314-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2016] [Accepted: 05/10/2017] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND In malaria endemic areas, infected blood donors serve as a source of infection to blood recipients, which may adversely affect their prognosis. This necessitates the proper screening of blood to be used for transfusion in these areas. The purpose of this study was to determine the prevalence of malaria parasitaemia in blood donors in Buea, Cameroon, and to evaluate the performance of a rapid diagnostic test (RDT), a malaria antibody enzyme-linked immunosorbent assay (ELISA), and a Plasmodium lactate dehydrogenase (pLDH) ELISA in the detection of asymptomatic malaria parasitaemia in the target population. METHODS In a prospective study conducted between September 2015 and June 2016, 1 240 potential blood donors were enrolled. The donors were screened for malaria parasites using Giemsa microscopy (GM) and a RDT. A sub-sample of 184 samples, comprising 88 positive and 96 negative samples, were selected for the evaluation of the pLDH ELISA and the antibody ELISA. The chi-square test and correlation analysis were performed as part of the statistical analyses. The statistical significance cut-off was set at P < 0.05. RESULTS The prevalence of malaria parasitaemia in this study was found to be 8.1% (95% CI: 6.6 - 9.7). The prevalence was not observed to be dependent on the age or sex of the participants. The RDT had a sensitivity (88.0%), specificity (99.1%), and negative predictive value (99.0%) higher than the ELISAs. The performance of the pLDH ELISA, which demonstrated the highest positive predictive value (91.6%), was generally comparable to the RDT. The sensitivity was lowest with the antibody ELISA (69.9%), which also demonstrated the highest false positive and false negative rates. The detection threshold for the pLDH (three parasites/μl) was lower compared to the RDT (50 - 60 parasites/μl). Non-significant positive correlations were observed between the parasite density and the pLDH titers and malaria antibody titers. CONCLUSIONS Overall, the RDT and the pLDH ELISA demonstrated a perfectly correlated agreement with GM, meanwhile the antibody ELISA demonstrated a substantially correlated agreement with GM. The pLDH is therefore recommended for mass screening of blood (to detect malaria parasitaemia) for transfusions in the study area. However, where this is not feasible, an RDT will suffice.
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Affiliation(s)
- Tebit Emmanuel Kwenti
- Department of Medical Laboratory Sciences, Faculty of Health Sciences, University of Buea, P.B. 63, Buea, Southwest Region, Cameroon. .,Department of Public Health and Hygiene, Faculty of Health Sciences, University of Buea, P.B. 63, Buea, Southwest Region, Cameroon. .,Blood Bank, Regional Hospital Buea, P.B. 32, Buea, Southwest Region, Cameroon.
| | - Longdoh Anna Njunda
- Department of Medical Laboratory Sciences, Faculty of Health Sciences, University of Buea, P.B. 63, Buea, Southwest Region, Cameroon
| | - Beltine Tsamul
- Department of Medical Laboratory Sciences, Faculty of Health Sciences, University of Buea, P.B. 63, Buea, Southwest Region, Cameroon.,Blood Bank, Regional Hospital Buea, P.B. 32, Buea, Southwest Region, Cameroon
| | - Shey Dickson Nsagha
- Department of Public Health and Hygiene, Faculty of Health Sciences, University of Buea, P.B. 63, Buea, Southwest Region, Cameroon
| | - Nguedia Jules-Clement Assob
- Department of Medical Laboratory Sciences, Faculty of Health Sciences, University of Buea, P.B. 63, Buea, Southwest Region, Cameroon
| | | | - Dilonga Henry Meriki
- Department of Public Health and Hygiene, Faculty of Health Sciences, University of Buea, P.B. 63, Buea, Southwest Region, Cameroon.,Blood Bank, Regional Hospital Buea, P.B. 32, Buea, Southwest Region, Cameroon
| | - Enow George Orock
- Programme in Medicine, Faculty of Health Sciences, University of Buea, Buea, Southwest Region, Cameroon
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11
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Diagnosing congenital malaria in a high-transmission setting: clinical relevance and usefulness of P. falciparum HRP2-based testing. Sci Rep 2017; 7:2080. [PMID: 28522856 PMCID: PMC5437093 DOI: 10.1038/s41598-017-02173-6] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2016] [Accepted: 04/25/2017] [Indexed: 11/08/2022] Open
Abstract
Congenital malaria diagnosis is challenging due to frequently observed low parasite density infections, while their clinical relevance during early infancy is not well characterized. In Nanoro health district (Burkina Faso), we determined the prevalence of congenital malaria by real-time quantitative PCR and we assessed the performance of rapid diagnosis test (RDT) and light microscopy (LM) to detect Plasmodium falciparum infections in cord-blood samples. In addition, we examined the usefulness of P. falciparum Histidine Rich Protein2 (PfHRP2) as surrogate biomarker of infection and explored association between congenital malaria and clinical outcomes. A prevalence of congenital malaria by qPCR of 4% (16/400) was found, which increased to 10% among newborns from mothers infected at delivery. RDT and LM showed poor performances indicating limited utility for congenital malaria screening in cord blood. Because PfHRP2 detection in cord blood could be affected by transplacental passage of parasite antigens, PfHRP2 might not be used as a surrogate biomarker of congenital malaria infections. There was no evidence of a significant clinical impact of congenital malaria on infant's health from birth to 59 days of life. Case control studies including long-term follow up may provide additional understanding on the relevance of neonatal malaria infections.
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Zheng X, Lin M, Xie DD, Li J, Chen JT, Eyi UM, Monte-Nguba SM, Ehapo JCS, Yang H, Yang HT, Yang LY. Prevalence of HIV and malaria: a cross-sectional study on Bioko Island, Equatorial Guinea. AJAR-AFRICAN JOURNAL OF AIDS RESEARCH 2017; 16:65-70. [PMID: 28367743 DOI: 10.2989/16085906.2016.1257495] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Malaria and HIV are two of the most severe public health problems in Africa. However, epidemiological data on Bioko Island is scarce. To investigate the prevalence of malaria and HIV infections and assess association of malaria and HIV infections and possible confounding factors, we performed a cross-sectional survey of people of malaria-endemic Bioko Island, Equatorial Guinea. A cross-sectional study of 1 526 subjects was carried out to determine the prevalence of malaria and HIV infection in Malabo region hospital on Bioko Island. Questionnaires were administered and venous blood samples were drawn for malaria parasites and HIV detection. The prevalence of participants infected with malaria and HIV in this area were 13.8% and 6.6% respectively. The average prevalence of co-infection for malaria and HIV was 0.92%. HIV-infection was significantly associated with the age and gender. Malaria infections were significantly associated with the age. This study showed that the prevalence of HIV and malaria on Bioko Island was higher than expected, although the co-infection prevalence of malaria and HIV was low. The results also indicated that malaria and HIV infections lead to more public health risk to youngsters and women.
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Affiliation(s)
- Xiangbin Zheng
- a Central Laboratory , Chaozhou Central Hospital Affiliated to Southern Medical University , Chaozhou , Guangdong , People's Republic of China
| | - Min Lin
- a Central Laboratory , Chaozhou Central Hospital Affiliated to Southern Medical University , Chaozhou , Guangdong , People's Republic of China
| | - Dong-De Xie
- b Laboratory Medical Center , The People's Hospital of Jiangmen , Jiangmen , Guangdong , People's Republic of China.,c The Chinese medical aid team to the Republic of Equatorial Guinea , Guangzhou , Guangdong Province , People's Republic of China
| | - Jian Li
- d Department of Parasitology , College of Basic Medicine, Hubei University of Medicine , Shiyan , Hubei , People's Republic of China
| | - Jiang-Tao Chen
- c The Chinese medical aid team to the Republic of Equatorial Guinea , Guangzhou , Guangdong Province , People's Republic of China.,e Laboratory Medical Center , Huizhou Municipal Central People's Hospital , Guangdong, Huizhou , Guangdong , People's Republic of China
| | - Urbano Monsuy Eyi
- f Central Blood Transfusion Service , Malabo Regional Hospital , Malabo , Republic of Equatorial Guinea
| | - Santiago-M Monte-Nguba
- g Medical Laboratory , Malabo Regional Hospital , Malabo , Republic of Equatorial Guinea
| | - Juan Carlos Sala Ehapo
- g Medical Laboratory , Malabo Regional Hospital , Malabo , Republic of Equatorial Guinea
| | - Hui Yang
- a Central Laboratory , Chaozhou Central Hospital Affiliated to Southern Medical University , Chaozhou , Guangdong , People's Republic of China
| | - Hui-Tian Yang
- a Central Laboratory , Chaozhou Central Hospital Affiliated to Southern Medical University , Chaozhou , Guangdong , People's Republic of China
| | - Li-Ye Yang
- a Central Laboratory , Chaozhou Central Hospital Affiliated to Southern Medical University , Chaozhou , Guangdong , People's Republic of China
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Abd Rahman N, Ibrahim F, Yafouz B. Dielectrophoresis for Biomedical Sciences Applications: A Review. SENSORS 2017; 17:s17030449. [PMID: 28245552 PMCID: PMC5375735 DOI: 10.3390/s17030449] [Citation(s) in RCA: 106] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/26/2016] [Revised: 12/10/2016] [Accepted: 12/20/2016] [Indexed: 12/18/2022]
Abstract
Dielectrophoresis (DEP) is a label-free, accurate, fast, low-cost diagnostic technique that uses the principles of polarization and the motion of bioparticles in applied electric fields. This technique has been proven to be beneficial in various fields, including environmental research, polymer research, biosensors, microfluidics, medicine and diagnostics. Biomedical science research is one of the major research areas that could potentially benefit from DEP technology for diverse applications. Nevertheless, many medical science research investigations have yet to benefit from the possibilities offered by DEP. This paper critically reviews the fundamentals, recent progress, current challenges, future directions and potential applications of research investigations in the medical sciences utilizing DEP technique. This review will also act as a guide and reference for medical researchers and scientists to explore and utilize the DEP technique in their research fields.
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Affiliation(s)
- Nurhaslina Abd Rahman
- Department of Biomedical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia.
- Centre for Innovation in Medical Engineering (CIME), Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia.
| | - Fatimah Ibrahim
- Department of Biomedical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia.
- Centre for Innovation in Medical Engineering (CIME), Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia.
| | - Bashar Yafouz
- Department of Biomedical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia.
- Centre for Innovation in Medical Engineering (CIME), Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia.
- Faculty of Engineering and Information Technology, Taiz University, 6803 Taiz, Yemen.
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14
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The hide and seek of Plasmodium vivax in West Africa: report from a large-scale study in Beninese asymptomatic subjects. Malar J 2016; 15:570. [PMID: 27887647 PMCID: PMC5123334 DOI: 10.1186/s12936-016-1620-z] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2016] [Accepted: 11/15/2016] [Indexed: 11/30/2022] Open
Abstract
Background Plasmodium vivax is considered to be absent from western Africa, where the prevalence of Duffy-negative red blood cell phenotype proves to be high. Several studies have, however, detected P. vivax infection cases in this part of Africa, raising the question of what is the actual prevalence of P. vivax in local populations.
Methods The presence of P. vivax was investigated in a large population of healthy blood donors in Benin using microscopy, serology and molecular detection. The seroprevalence was measured with species-specific ELISA using two recombinant P. vivax proteins, namely rPvMSP1 and rPvCSP1. Specific molecular diagnosis of P. vivax infection was carried out using nested-PCR. The performances and cut-off values of both rPvCSP1 and rPvMSP1 ELISA were first assessed using sera from P. vivax-infected patients and from non-exposed subjects. Results Among 1234 Beninese blood donors, no parasites were detected when using microscopy, whereas 28.7% (354/1234) of patients exhibited had antibodies against rPvMSP1, 21.6% (266/1234) against rPvCSP1, and 15.2% (187/1234) against both. Eighty-four samples were selected for nested-PCR analyses, of which 13 were positive for P. vivax nested-PCR and all Duffy negative.
Conclusion The results of the present study highlight an unexpectedly high exposure of Beninese subjects to P. vivax, resulting in sub-microscopic infections. This suggests a probably underestimated and insidious parasite presence in western Africa. While the vaccination campaigns and therapeutic efforts are all focused on Plasmodium falciparum, it is also essential to consider the epidemiological impact of P. vivax. Electronic supplementary material The online version of this article (doi:10.1186/s12936-016-1620-z) contains supplementary material, which is available to authorized users.
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15
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Chouna JR, Nardella F, Lenta BN, Vonthron-Sénécheau C, Nkeng-Efouet-Alango P, Sewald N. Ceanothane-type triterpenoids from Cyphostemma adenocaule. Arch Pharm Res 2016:10.1007/s12272-016-0801-1. [PMID: 27461028 DOI: 10.1007/s12272-016-0801-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2016] [Accepted: 07/20/2016] [Indexed: 11/25/2022]
Abstract
Phytochemical investigation of the methanol extract of Cyphostemma adenocaule liana (bark and wood) led to the isolation of two new ceanothane-type triterpenoids, cyphostemmic acid A 1 and cyphostemmic acid B 2, together with the known triterpenoids 3-7, β-sitosterol and its glucoside. The structures of the isolated compounds were established by 1D- and 2D-NMR spectroscopy. Ozonolysis of cyphostemmic acid A 1, epigouanic acid A 3 and betulin 6 yielded semisynthetic derivatives, cyphostemmic acid C 8, cyphostemmic acid D 9, and 3β,28-dihydroxy-30-norlupan-20-one 10 respectively. Compounds 1-4, 6, 8-10 were tested in vitro, for their antiplasmodial activity against Plasmodium falciparum 3D7 strain and showed weak activity.
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Affiliation(s)
- Jean Rodolphe Chouna
- Department of Chemistry, Faculty of Science, University of Dschang, P.O. Box 67, Dschang, Cameroon
| | - Flore Nardella
- Laboratoire d'Innovation Thérapeutique, UMR7200 CNRS/Université de Strasbourg, Labex Médalis, Faculté de Pharmacie, 74 Route du Rhin, 67412, Illkirch, France
- Institut de Parasitologie et de Pathologie Tropicale, EA 7292 Dynamique des Intercations Hôte-Pathogènes, Faculté de Médecine, 3 rue Koberlé, 67000, Strasbourg, France
| | - Bruno Ndjakou Lenta
- Department of Chemistry, Higher Teacher Training College, University of Yaoundé 1, P.O. Box 47, Yaoundé, Cameroon
| | - Catherine Vonthron-Sénécheau
- Laboratoire d'Innovation Thérapeutique, UMR7200 CNRS/Université de Strasbourg, Labex Médalis, Faculté de Pharmacie, 74 Route du Rhin, 67412, Illkirch, France
| | | | - Norbert Sewald
- Organic and Bioorganic Chemistry, Department of Chemistry, Bielefeld University, P.O. Box 100131, 33501, Bielefeld, Germany
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16
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Houël E, Nardella F, Jullian V, Valentin A, Vonthron-Sénécheau C, Villa P, Obrecht A, Kaiser M, Bourreau E, Odonne G, Fleury M, Bourdy G, Eparvier V, Deharo E, Stien D. Wayanin and guaijaverin, two active metabolites found in a Psidium acutangulum Mart. ex DC (syn. P. persoonii McVaugh) (Myrtaceae) antimalarial decoction from the Wayana Amerindians. JOURNAL OF ETHNOPHARMACOLOGY 2016; 187:241-8. [PMID: 27132714 DOI: 10.1016/j.jep.2016.04.053] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2016] [Revised: 04/14/2016] [Accepted: 04/28/2016] [Indexed: 05/20/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Psidium acutangulum Mart. ex DC is a small tree used by the Wayana Amerindians from the Upper-Maroni in French Guiana for the treatment of malaria. AIM OF THE STUDY In a previous study, we highlighted the in vitro antiplasmodial, antioxidant and anti-inflammatory potential of the traditional decoction of P. acutangulum aerial parts. Our goal was then to investigate on the origin of the biological activity of the traditional remedy, and eventually characterize active constituents. MATERIALS AND METHODS Liquid-liquid extractions were performed on the decoction, and the antiplasmodial activity evaluated against chloroquine-resistant FcB1 ([(3)H]-hypoxanthine bioassay) and 7G8 (pLDH bioassay) P. falciparum strains, and on a chloroquine sensitive NF54 ([(3)H]-hypoxanthine bioassay) P. falciparum strain. The ethyl acetate fraction (D) was active and underwent bioguided fractionation. All the isolated compounds were tested on P. falciparum FcB1 strain. In vitro anti-inflammatory activity (IL-1β, IL-6, IL-8, TNFα) of the ethyl acetate fraction and of an anti-Plasmodium active compound, was concurrently assessed on LPS-stimulated human PBMC and NO secretion inhibition was measured on LPS stimulated RAW murine macrophages. Cytotoxicity of the fractions and pure compounds was measured on VERO cells, L6 mammalian cells, PBMCs, and RAW cells. RESULTS Fractionation of the ethyl acetate soluble fraction (IC50 ranging from 3.4 to <1µg/mL depending on the parasite strain) led to the isolation of six pure compounds: catechin and five glycosylated quercetin derivatives. These compounds have never been isolated from this plant species. Two of these compounds (wayanin and guaijaverin) were found to be moderately active against P. falciparum FcB1 in vitro (IC50 5.5 and 6.9µM respectively). We proposed the name wayanin during public meetings organized in June 2015 in the Upper-Maroni villages, in homage to the medicinal knowledge of the Wayana population. At 50µg/mL, the ethyl acetate fraction (D) significantly inhibited IL-1β secretion (-46%) and NO production (-21%), as previously observed for the decoction. The effects of D and guiajaverin (4) on the secretion of other cytokines or NO production were not significant. CONCLUSIONS The confirmed antiplasmodial activity of the ethyl acetate soluble fraction of the decoction and of the isolated compounds support the previous results obtained on the P. acutangulum decoction. The antiplasmodial activity might be due to a mixture of moderately active non-toxic flavonoids. The anti-inflammatory activities were less marked for ethyl acetate fraction (D) than for the decoction.
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Affiliation(s)
- Emeline Houël
- CNRS, UMR EcoFoG (AgroParisTech, CIRAD, INRA, UA, UG), Institut Pasteur de la Guyane, 23 Avenue Pasteur, BP6010, 97306 Cayenne Cedex, French Guiana.
| | - Flore Nardella
- Laboratoire d'Innovation Thérapeutique UMR CNRS 7200, LabEx Medalis, Faculté de Pharmacie, Université de Strasbourg, 74 route du Rhin, 67401 Illkirch cedex, France; Institut de Parasitologie et de Pathologie Tropicale de Strasbourg (IPPTS) - Faculté de Médecine, Université de Strasbourg, Strasbourg, France
| | - Valérie Jullian
- UMR 152 Pharma Dev, Université de Toulouse, IRD, UPS, France
| | - Alexis Valentin
- UMR 152 Pharma Dev, Université de Toulouse, IRD, UPS, France
| | - Catherine Vonthron-Sénécheau
- Laboratoire d'Innovation Thérapeutique UMR CNRS 7200, LabEx Medalis, Faculté de Pharmacie, Université de Strasbourg, 74 route du Rhin, 67401 Illkirch cedex, France
| | - Pascal Villa
- Plate-forme de Chimie Biologique Intégrative de Strasbourg UMS 3286 CNRS-Université de Strasbourg, LabEx Medalis et FMTS, ESBS Pôle API, Bld Sébastien Brant, 67412 Illkirch Cedex, France
| | - Adeline Obrecht
- Plate-forme de Chimie Biologique Intégrative de Strasbourg UMS 3286 CNRS-Université de Strasbourg, LabEx Medalis et FMTS, ESBS Pôle API, Bld Sébastien Brant, 67412 Illkirch Cedex, France
| | - Marcel Kaiser
- Swiss Tropical and Public Health Institution, Socinstrasse 57, 4002 Basel, Switzerland; University of Basel, Petersplatz 1, 4003 Basel, Switzerland
| | - Eliane Bourreau
- Institut Pasteur de la Guyane, 23 Avenue Pasteur, BP6010, 97306 Cayenne Cedex, French Guiana
| | - Guillaume Odonne
- Laboratoire Ecologie,évolution, interactions des systèmes amazoniens (LEEISA), CNRS, Université de Guyane, IFREMER, 97300 Cayenne, French Guiana
| | - Marie Fleury
- Museum National d'Histoire Naturelle, UMR 208 PALoc, MNHN-IRD, BP 165, 97323 Cayenne cedex, French Guiana
| | | | - Véronique Eparvier
- CNRS - Institut de Chimie des Substances Naturelles, 1 Avenue de la Terrasse, 91198 Gif-sur-Yvette Cedex, France
| | - Eric Deharo
- UMR 152 Pharma Dev, Université de Toulouse, IRD, UPS, France
| | - Didier Stien
- CNRS - Institut de Chimie des Substances Naturelles, 1 Avenue de la Terrasse, 91198 Gif-sur-Yvette Cedex, France; Sorbonne Universités, UPMC Univ Paris 06, CNRS, Laboratoire de Biodiversité et Biotechnologies Microbiennes (LBBM), Observatoire Océanologique, 66650 Banyuls/Mer, France.
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De SL, Stanisic DI, Rivera F, Batzloff MR, Engwerda C, Good MF. Plasmodium berghei bio-burden correlates with parasite lactate dehydrogenase: application to murine Plasmodium diagnostics. Malar J 2016; 15:3. [PMID: 26729268 PMCID: PMC4700574 DOI: 10.1186/s12936-015-1027-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2015] [Accepted: 12/02/2015] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The spectrum of techniques to detect malaria parasites in whole blood is limited to measuring parasites in circulation. One approach that is currently used to enumerate total parasite bio-burden involves the use of bio-luminescent parasites. As an alternative approach, this study describes the use of a commercial ELISA human parasite lactate dehydrogenase (pLDH) detection kit to estimate total parasite bio-burden in murine malaria models. METHODS The cross reactivity of pLDH in a commercial human malaria pLDH diagnostic kit was established in different components of blood for different murine malaria models. The use of pLDH as a measure of parasite bio-burden was evaluated by examining pLDH in relation to peripheral blood parasitaemia as determined by microscopy and calculating total parasite bio-burden using a bio-luminescent Plasmodium berghei ANKA luciferase parasite. RESULTS The pLDH antigen was detected in all four murine Plasmodium species and in all components of Plasmodium-infected blood. A significant correlation (r = 0.6922, P value <0.0001) was observed between total parasite bio-burden, measured as log average radiance, and concentration of pLDH units. CONCLUSIONS This high throughput assay is a suitable measure of total parasite bio-burden in murine malaria infections. Unlike existing methods, it permits the estimation of both circulating and sequestered parasites, allowing a more accurate assessment of parasite bio-burden.
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Affiliation(s)
- Sai Lata De
- Institute for Glycomics, Griffith University, Gold Coast, QLD, Australia.
| | | | - Fabian Rivera
- QIMR Berghofer Medical Research Institute, Brisbane, QLD, Australia.
| | - Michael R Batzloff
- Institute for Glycomics, Griffith University, Gold Coast, QLD, Australia.
| | | | - Michael F Good
- Institute for Glycomics, Griffith University, Gold Coast, QLD, Australia.
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Kim J, Jang JW, Kim JY, Oh DJ, Lim CS. Combined Use of Malaria Antigen and Antibody Enzyme-Linked Immunosorbent Assay for Blood Screening of Plasmodium vivax in the Republic of Korea. Med Princ Pract 2016; 25:212-8. [PMID: 26794404 PMCID: PMC5588392 DOI: 10.1159/000444144] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/19/2015] [Accepted: 01/20/2016] [Indexed: 11/19/2022] Open
Abstract
OBJECTIVE To evaluate the clinical sensitivity and specificity of the newly developed Genedia malaria antigen enzyme-linked immunosorbent assay (ELISA) test and to evaluate the diagnostic efficiency of the combined use of the Genedia malaria antigen and antibody ELISA tests to detect Plasmodium vivax in blood samples. MATERIALS AND METHODS In all, 1,070 samples were analyzed: 300 P. vivax-infected patients, 41 samples from posttreatment patients upon follow-up and 729 healthy volunteers. The Genedia malaria antigen ELISA test and the Genedia malaria antibody ELISA 2.0 test were evaluated and compared to polymerase chain reaction and microscopy. RESULTS The Genedia malaria antigen ELISA test had a clinical sensitivity of 94.7% (284/300) and a clinical specificity of 99.3% (724/729). The Genedia malaria antibody ELISA 2.0 test had a clinical sensitivity of 94.0% (282/300) and a clinical specificity of 98.4% (717/729). The Genedia malaria antigen ELISA test was able to detect 13 confirmed P. vivax cases without antibodies against P. vivax, whereas the Genedia malaria antibody ELISA 2.0 test detected 11 confirmed P. vivax cases nonreactive to the Genedia malaria antigen ELISA test, and 25 cases from 41 follow-up samples nonreactive in the Genedia malaria antigen ELISA test. The combined Genedia malaria antigen and antibody ELISA 2.0 tests had a clinical sensitivity of 98.3% (295/300) and a clinical specificity of 97.9% (714/729). CONCLUSION The combination of antigen and antibody ELISAs improved the diagnostic sensitivity in P. vivax-confirmed cases in the Republic of Korea.
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Affiliation(s)
- Jeeyong Kim
- Department of Laboratory Medicine, Brain Korea 21 Graduate School of Medicine, College of Medicine, Korea University, Seoul, Republic of Korea
| | - Jin Woo Jang
- Department of Laboratory Medicine, Brain Korea 21 Graduate School of Medicine, College of Medicine, Korea University, Seoul, Republic of Korea
| | - Ju Yeon Kim
- Department of Laboratory Medicine, Brain Korea 21 Graduate School of Medicine, College of Medicine, Korea University, Seoul, Republic of Korea
| | - Deok Ja Oh
- Central Blood Laboratory Center, Korean Red Cross, Seoul, Republic of Korea
| | - Chae Seung Lim
- Department of Laboratory Medicine, Brain Korea 21 Graduate School of Medicine, College of Medicine, Korea University, Seoul, Republic of Korea
- *Chae Seung Lim, Department of Laboratory Medicine, College of Medicine, Korea University Guro Hospital, Guro 2 Dong, Guro Gu, Seoul 152-703 (Republic of Korea), E-Mail
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Lenta BN, Ateba JT, Chouna JR, Aminake MN, Nardella F, Pradel G, Neumann B, Stammler HG, Vonthron-Sénécheau C, Ngouela S, Sewald N. Two 2,6-Dioxabicyclo[3.3.1]nonan-3-ones fromPhragmanthera capitata(Spreng.)Balle(Loranthaceae). Helv Chim Acta 2015. [DOI: 10.1002/hlca.201400367] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Houël E, Fleury M, Odonne G, Nardella F, Bourdy G, Vonthron-Sénécheau C, Villa P, Obrecht A, Eparvier V, Deharo E, Stien D. Antiplasmodial and anti-inflammatory effects of an antimalarial remedy from the Wayana Amerindians, French Guiana: takamalaimë (Psidium acutangulum Mart. ex DC., Myrtaceae). JOURNAL OF ETHNOPHARMACOLOGY 2015; 166:279-285. [PMID: 25792015 DOI: 10.1016/j.jep.2015.03.015] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2014] [Revised: 02/10/2015] [Accepted: 03/08/2015] [Indexed: 06/04/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Field investigations highlighted the use of Psidium acutangulum Mart. ex DC (syn. P. persoonii McVaugh), a small tree used by the Wayana Amerindians in Twenke-Taluhwen and Antecume-Pata, French Guiana, for the treatment of malaria, and administered either orally in the form of a decoction or applied externally over the whole body. This use appears limited to the Wayana cultural group in French Guiana and has never been reported anywhere else. Our goal was to evaluate the antimalarial and anti-inflammatory activities of a P. acutangulum decoction to explain the good reputation of this remedy. MATERIALS AND METHODS Interviews with the Wayana inhabitants of Twenke-Taluhwen and Antecume-Pata were conducted within the TRAMAZ project according to the TRAMIL methodology, which is based on a quantitative and qualitative analysis of medicinal plant uses. A decoction of dried aerial parts of P. acutangulum was prepared in consistency with the Wayana recipe. In vitro antiplasmodial assays were performed on chloroquine-resistant FcB1 ([(3)H]-hypoxanthine bioassay) and 7G8 (pLDH bioassay) P. falciparum strains and on chloroquine sensitive NF54 ([(3)H]-hypoxanthine bioassay) P. falciparum strain. In vitro anti-inflammatory activity (IL-1β, IL-6, IL-8, TNFα) was evaluated on LPS-stimulated human PBMC and NO secretion inhibition was measured on LPS stimulated RAW murine macrophages. Cytotoxicity of the decoction was measured on L6 mammalian cells, PBMCs, and RAW cells. A preliminary evaluation of the in vivo antimalarial activity of the decoction, administered orally twice daily, was assessed by the classical four-day suppressive test against P. berghei NK65 in mice. RESULTS The decoction displayed a good antiplasmodial activity in vitro against the three tested strains, regardless to the bioassay used, with IC50 values of 3.3µg/mL and 10.3µg/mL against P. falciparum FcB1 and NF54, respectively and 19.0µg/mL against P. falciparum 7G8. It also exhibited significant anti-inflammatory activity in vitro in a dose dependent manner. At a concentration of 50µg/mL, the decoction inhibited the secretion of the following pro-inflammatory cytokines: TNFα (-18%), IL-1β (-58%), IL-6 (-32%), IL-8 (-21%). It also exhibited a mild NO secretion inhibition (-13%) at the same concentration. The decoction was non-cytotoxic against L6 cells (IC50>100µg/mL), RAW cells and PBMC. In vivo, 150µL of the decoction given orally twice a day (equivalent to 350mg/kg/day of dried extract) inhibited 39.7% average parasite growth, with more than 50% of inhibition in three mice over five. The absence of response for the two remaining mice, however, induced a strong standard deviation. CONCLUSIONS This study highlighted the in vitro antiplasmodial activity of the decoction of P. acutangulum aerial parts, used by Wayana Amerindians from the Upper-Maroni in French Guiana in case of malaria. Its antioxidant and anti-inflammatory potential, which may help to explain its use against this disease, was demonstrated using models of artificially stimulated cells.
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Affiliation(s)
- Emeline Houël
- CNRS - UMR Ecologie des Forêts de Guyane (EcoFoG), Institut Pasteur de la Guyane, 23 Avenue Pasteur, BP6010, 97306 Cayenne Cedex, French Guiana.
| | - Marie Fleury
- Museum National d'Histoire Naturelle, UMR 208 PALoc, MNHN-IRD, BP 165, 97323 Cayenne Cedex, French Guiana
| | - Guillaume Odonne
- CNRS-Guyane - USR 3456, 2 avenue Gustave Charlery, 97300 Cayenne, French Guiana
| | - Flore Nardella
- Laboratoire d'Innovation Thérapeutique UMR CNRS 7200, LabEx Medalis, Faculté de Pharmacie, Université de Strasbourg, 74 route du Rhin, 67401 Illkirch Cedex, France; Institut de Parasitologie et de Pathologie Tropicale de Strasbourg (IPPTS) - Faculté de Médecine, Université de Strasbourg, Strasbourg, France
| | - Geneviève Bourdy
- Université de Toulouse, UMR 152 PharmaDEV, Faculté de Pharmacie, 35 Chemin des Maraîchers, 31062 Toulouse Cedex 9, France; Institut de Recherche pour le Développement (IRD), UMR 152 PharmaDEV, Faculté de Pharmacie, 35 Chemin des Maraîchers, 31062 Toulouse Cedex 9, France
| | - Catherine Vonthron-Sénécheau
- Laboratoire d'Innovation Thérapeutique UMR CNRS 7200, LabEx Medalis, Faculté de Pharmacie, Université de Strasbourg, 74 route du Rhin, 67401 Illkirch Cedex, France
| | - Pascal Villa
- Plate-forme de Chimie Biologique Intégrative de Strasbourg UMS 3286 CNRS-Université de Strasbourg, LabEx Medalis et FMTS, ESBS Pôle API, Bld Sébastien Brant, 67412 Illkirch Cedex, France
| | - Adeline Obrecht
- Plate-forme de Chimie Biologique Intégrative de Strasbourg UMS 3286 CNRS-Université de Strasbourg, LabEx Medalis et FMTS, ESBS Pôle API, Bld Sébastien Brant, 67412 Illkirch Cedex, France
| | - Véronique Eparvier
- CNRS - Institut de Chimie des Substances Naturelles, 1 Avenue de la Terrasse, 91198 Gif-sur-Yvette Cedex, France
| | - Eric Deharo
- Université de Toulouse, UMR 152 PharmaDEV, Faculté de Pharmacie, 35 Chemin des Maraîchers, 31062 Toulouse Cedex 9, France; Institut de Recherche pour le Développement (IRD), UMR 152 PharmaDEV, Faculté de Pharmacie, 35 Chemin des Maraîchers, 31062 Toulouse Cedex 9, France
| | - Didier Stien
- CNRS - Institut de Chimie des Substances Naturelles, 1 Avenue de la Terrasse, 91198 Gif-sur-Yvette Cedex, France; Sorbonne Universités, UPMC Univ Paris 06, CNRS, Laboratoire de Biodiversité et Biotechnologies Microbiennes (LBBM), Observatoire Océanologique, 66650 Banyuls-sur-mer, France.
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DNA Sequence Polymorphism of the Lactate Dehydrogenase Genefrom Iranian Plasmodium vivax and Plasmodium falciparum Isolates. IRANIAN JOURNAL OF PARASITOLOGY 2015; 10:505-16. [PMID: 26811715 PMCID: PMC4724825] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
BACKGROUND Parasite lactate dehydrogenase (pLDH) is extensively employed as malaria rapid diagnostic tests (RDTs). Moreover, it is a well-known drug target candidate. However, the genetic diversity of this gene might influence performance of RDT kits and its drug target candidacy. This study aimed to determine polymorphism of pLDH gene from Iranian isolates of P. vivax and P. falciparum. METHODS Genomic DNA was extracted from whole blood of microscopically confirmed P. vivax and P. falciparum infected patients. pLDH gene of P. falciparum and P. vivax was amplified using conventional PCR from 43 symptomatic malaria patients from Sistan and Baluchistan Province, Southeast Iran from 2012 to 2013. RESULTS Sequence analysis of 15 P. vivax LDH showed fourteen had 100% identity with P. vivax Sal-1 and Belem strains. Two nucleotide substitutions were detected with only one resulted in amino acid change. Analysis of P. falciparum LDH sequences showed six of the seven sequences had 100% homology with P. falciparum 3D7 and Mzr-1. Moreover, PfLDH displayed three nucleotide changes that resulted in changing only one amino acid. PvLDH and PfLDH showed 75%-76% nucleotide and 90.4%-90.76% amino acid homology. CONCLUSION pLDH gene from Iranian P. falciparum and P. vivax isolates displayed 98.8-100% homology with 1-3 nucleotide substitutions. This indicated this gene was relatively conserved. Additional studies can be done weather this genetic variation can influence the performance of pLDH based RDTs or not.
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Grabias B, Zheng H, Mlambo G, Tripathi AK, Kumar S. A sensitive enhanced chemiluminescent-ELISA for the detection of Plasmodium falciparum circumsporozoite antigen in midguts of Anopheles stephensi mosquitoes. J Microbiol Methods 2014; 108:19-24. [PMID: 25455023 DOI: 10.1016/j.mimet.2014.10.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2014] [Revised: 10/10/2014] [Accepted: 10/10/2014] [Indexed: 02/05/2023]
Abstract
Efforts to develop a successful malaria vaccine are hampered due to lack of assays that are predictive of protective immunity without conducting large clinical studies. The effect of experimental vaccines and drugs on malaria transmission is yet more difficult to measure. Knowledge on the Plasmodium infection rate in mosquito populations will aid the measurement of effects from intervention measures for malaria control. Here, we report the development of a chemiluminescent sandwich ELISA (ECL-ELISA) that can detect Plasmodium falciparum circumsporozoite protein (Pf CSP) produced in recombinant form at concentrations of 4.4pg and in P. falciparum sporozoites (Pf SPZ) derived from mosquito salivary glands at levels corresponding to 5 Pf SPZ. Most importantly, we demonstrate reliable Pf CSP-based detection of 0.056day 8 P. falciparum oocysts developing inside mosquito midguts in whole mosquito lysates. Cumulatively, the ECL-ELISA is 47× more sensitive for the detection of Pf CSP than a colorimetric ELISA while greatly simplifying sample preparation, obviating the need for cumbersome midgut dissections and allowing high throughput screening of Plasmodium infection in mosquito populations. The ECL-ELISA may also have broader application in diagnosis of infectious diseases and the prognostic value in cancer and other diseases such as auto-immunity and genetic disorders based on antigen detection, or quality validation of biological vaccine components.
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Affiliation(s)
- Bryan Grabias
- Laboratory of Emerging Pathogens, Division of Emerging and Transfusion Transmitted Diseases, Office of Blood Research and Review, Center for Biologics Evaluation and Research, Food and Drug Administration, Rockville, MD USA.
| | - Hong Zheng
- Laboratory of Emerging Pathogens, Division of Emerging and Transfusion Transmitted Diseases, Office of Blood Research and Review, Center for Biologics Evaluation and Research, Food and Drug Administration, Rockville, MD USA.
| | - Godfree Mlambo
- The Johns Hopkins Malaria Research Institute, Bloomberg School of Public Health, The Johns Hopkins University, Baltimore, MD 21205, United States; Department of Molecular Microbiology and Immunology, Bloomberg School of Public Health, The Johns Hopkins University, Baltimore, MD 21205, United States.
| | - Abhai K Tripathi
- The Johns Hopkins Malaria Research Institute, Bloomberg School of Public Health, The Johns Hopkins University, Baltimore, MD 21205, United States; Department of Molecular Microbiology and Immunology, Bloomberg School of Public Health, The Johns Hopkins University, Baltimore, MD 21205, United States.
| | - Sanjai Kumar
- Laboratory of Emerging Pathogens, Division of Emerging and Transfusion Transmitted Diseases, Office of Blood Research and Review, Center for Biologics Evaluation and Research, Food and Drug Administration, Rockville, MD USA.
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Doderer-Lang C, Atchade PS, Meckert L, Haar E, Perrotey S, Filisetti D, Aboubacar A, Pfaff AW, Brunet J, Chabi NW, Akpovi CD, Anani L, Bigot A, Sanni A, Candolfi E. The ears of the African elephant: unexpected high seroprevalence of Plasmodium ovale and Plasmodium malariae in healthy populations in Western Africa. Malar J 2014; 13:240. [PMID: 24946685 PMCID: PMC4071337 DOI: 10.1186/1475-2875-13-240] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2014] [Accepted: 05/29/2014] [Indexed: 11/25/2022] Open
Abstract
Background Malaria Is A Life-Threatening Pathology In Africa. Plasmodium Falciparum And Plasmodium Vivax Attract The Most Focus Because Of Their High Prevalence And Mortality. Knowledge About The Prevalence Of The Cryptic Pathogens Plasmodium Ovale And Plasmodium Malariae Is Limited. Thanks To Recombinant Tools, Their Seroprevalence Was Measured For The First Time, As Well As The Prevalence Of Mixed Infections In A Malaria-Asymptomatic Population In Benin, A Malaria-Endemic Country. Methods A Panel Of 1,235 Blood Donations Collected Over Ten Months In Benin Was Used For Validation Of The Recombinant Tools. Recombinant P. Falciparum, P. Malariae, P. Ovale MSP1, And P. Falciparum AMA1 Were Engineered And Validated On A Biobank With Malaria-Infected Patients (N = 144) Using A Species-Speific ELISA Test (Recelisa). Results Were Compared To An ELISA Using A Native P. Falciparum Antigen (NatELISA). Results Among Microscopically Negative African Blood Donors, 85% (1,050/1,235) Present Antibodies Directed To Native P. Falciparum, 94.4% (1,166/1,235) To rPfMSP1 And rPfAMA1, 56.8% (702/1,235) To rPoMSP1, 67.5% (834/1235) To rPmMSP1 And 45.3% Of The Malaria Seropositive Population Had Antibodies Recognizing The Three Species. Conclusion A High Rate Of Antibodies Against P. Ovale And P. Malariae Was Found In Asymptomatic Blood Donors. The Proportion Of Mixed Infections Involving Three Species Was Also Unexpected. These Data Suggest That Determining Seroprevalence For These Cryptic Species Is An Appropriate Tool To Estimate Their Incidence, At The Eve Of Upcoming Anti-P. Falciparum Vaccination Campaigns.
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Affiliation(s)
- Cécile Doderer-Lang
- Institut de Parasitologie et de Pathologie Tropicale Université de Strasbourg, 3, Rue Koeberlé, F67000 Strasbourg, France.
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Nansseu JRN, Noubiap JJN, Ndoula ST, Zeh AFM, Monamele CG. What is the best strategy for the prevention of transfusion-transmitted malaria in sub-Saharan African countries where malaria is endemic? Malar J 2013; 12:465. [PMID: 24373501 PMCID: PMC3877868 DOI: 10.1186/1475-2875-12-465] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2013] [Accepted: 12/18/2013] [Indexed: 11/10/2022] Open
Abstract
The transmission of malaria by blood transfusion was one of the first recorded incidents of transfusion-transmitted infections (TTIs). Although the World Health Organization (WHO) recommends that blood for transfusion should be screened for TTIs, malaria screening is not performed in most malaria-endemic countries in sub-Saharan Africa (SSA). The transfusion of infected red blood cells may lead to severe post-transfusion clinical manifestations of malaria, which could be rapidly fatal. Ensuring that blood supply in endemic countries is free from malaria is highly problematical, as most of the donors may potentially harbour low levels of malaria parasites. Pre-transfusion screening within endemic settings has been identified as a cost-effective option for prevention of transfusion-transmitted malaria (TTM). But currently, there is no screening method that is practical, affordable and suitably sensitive for use by blood banks in SSA. Even if this method was available, rejection of malaria-positive donors would considerably jeopardize the blood supply and increase morbidity and mortality, especially among pregnant women and children who top the scale of blood transfusion users in SSA. In this context, the systematic prophylaxis of recipients with anti-malarials could constitute a good alternative, as it prevents any deferral of donor units as well as the occurrence of TTM. With the on-going programme, namely the Affordable Medicine Facility - Malaria, there is an increase in the availability of low-priced artemisinin-based combination therapy that can be used for systematic prophylaxis. It appears nonetheless an urgent need to conduct cost-benefit studies in order to evaluate each of the TTM preventive methods. This approach could permit the design and implementation of an evidence-based measure of TTM prevention in SSA, advocating thereby its widespread use in the region.
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Anani LY, Bigot A, Latoundji S, Ahlonsou F, de Souza J, Akplogan S, Lawson J, Py JY, Zohoun I. [Reality and importance of transfusion-transmitted malaria in a stable endemic context: Cotonou case in Benin]. Transfus Clin Biol 2013; 21:23-30. [PMID: 24360799 DOI: 10.1016/j.tracli.2013.10.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2013] [Accepted: 10/24/2013] [Indexed: 11/25/2022]
Abstract
Malaria endemic status of our countries supports avoiding malaria screening for the blood qualification. But this attitude makes young children, pregnant women and people without semi-immunity incur a high risk of malaria. The goal of the survey was to value the reality and the importance of transfusion-transmitted malaria and to assess its determining factors. The study included 141 packed-red-cells units transfused to 77 hospitalized recipients, not suffering from malaria and not having been transfused the last two weeks. Every packed-red-cells assigned to a patient was tested for malaria before use. Thick and thin blood film were performed 96hours after transfusion. A clinical follow-up was undertaken as well as in the hospital and at home after release. In all, 13.47% of the transfused packed-red-cells were positive for the thick blood film. Plasmodium research in patients was negative 96hours after transfusion, even in the 19 patients who had received parasitized blood units! The home follow-up had permitted to note that 15.78% of blood recipients had developed clinical malaria. Parasitic density ≥240 parasites/mm(3) seems to be a determining factor. Transfusion-transmitted malaria is a reality we ought to consider. Introduction of malaria screening in donated blood qualification testings simultaneously with a framing of the blood donors appear the lasting solution to hope in the future to limit the waited excessive blood evictions.
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Affiliation(s)
- L Y Anani
- UFR d'hématologie, FSS Cotonou, Bénin.
| | - A Bigot
- UFR d'immunologie, FSS Cotonou, Bénin
| | | | - F Ahlonsou
- Agence nationale pour la transfusion sanguine, Cotonou, Bénin
| | - J de Souza
- UFR de gynécologie-obstétrique, Cotonou, Bénin
| | - S Akplogan
- Laboratoire d'hématologie, CNHU-HKM, Cotonou, Bénin
| | - J Lawson
- Banque de sang, CNHU-HKM, Cotonou, Bénin
| | - J Y Py
- EFS Centre-Atlantique, Orléans, France
| | - I Zohoun
- UFR d'hématologie, FSS Cotonou, Bénin
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