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Toxicity on Dengue Mosquito Vectors Through Myristica fragrans-Synthesized Zinc Oxide Nanorods, and Their Cytotoxic Effects on Liver Cancer Cells (HepG2). J CLUST SCI 2016. [DOI: 10.1007/s10876-016-1075-y] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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52
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de Lima TFM, Lana RM, de Senna Carneiro TG, Codeço CT, Machado GS, Ferreira LS, de Castro Medeiros LC, Davis Junior CA. DengueME: A Tool for the Modeling and Simulation of Dengue Spatiotemporal Dynamics. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2016; 13:E920. [PMID: 27649226 PMCID: PMC5036753 DOI: 10.3390/ijerph13090920] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/15/2016] [Revised: 08/17/2016] [Accepted: 09/01/2016] [Indexed: 12/31/2022]
Abstract
The prevention and control of dengue are great public health challenges for many countries, particularly since 2015, as other arboviruses have been observed to interact significantly with dengue virus. Different approaches and methodologies have been proposed and discussed by the research community. An important tool widely used is modeling and simulation, which help us to understand epidemic dynamics and create scenarios to support planning and decision making processes. With this aim, we proposed and developed DengueME, a collaborative open source platform to simulate dengue disease and its vector's dynamics. It supports compartmental and individual-based models, implemented over a GIS database, that represent Aedes aegypti population dynamics, human demography, human mobility, urban landscape and dengue transmission mediated by human and mosquito encounters. A user-friendly graphical interface was developed to facilitate model configuration and data input, and a library of models was developed to support teaching-learning activities. DengueME was applied in study cases and evaluated by specialists. Other improvements will be made in future work, to enhance its extensibility and usability.
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Affiliation(s)
- Tiago França Melo de Lima
- Departamento de Computação e Sistemas (DECSI), Instituto de Ciências Exatas e Aplicadas (ICEA), Universidade Federal de Ouro Preto (UFOP) - Campus João Monlevade, João Monlevade, MG 35931-008, Brasil.
| | - Raquel Martins Lana
- Programa Pós-Graduação em Epidemiologia em Saúde Pública, Escola Nacional de Saúde Pública Sérgio Arouca (ENSP), Fundação Oswaldo Cruz (Fiocruz), Rio de Janeiro, RJ 21045-900, Brasil.
| | - Tiago Garcia de Senna Carneiro
- Departamento de Computação (DECOM), Instituto de Ciências Exatas e Biológicas (ICEB), Universidade Federal de Ouro Preto (UFOP) - Campus Morro do Cruzeiro, Ouro Preto, MG 35400-000, Brasil.
| | - Cláudia Torres Codeço
- Programa de Computação Científica (PROCC), Fundação Oswaldo Cruz (Fiocruz), Rio de Janeiro, RJ 21045-900, Brasil.
| | - Gabriel Souza Machado
- Departamento de Computação e Sistemas (DECSI), Instituto de Ciências Exatas e Aplicadas (ICEA), Universidade Federal de Ouro Preto (UFOP) - Campus João Monlevade, João Monlevade, MG 35931-008, Brasil.
| | - Lucas Saraiva Ferreira
- Departamento de Computação e Sistemas (DECSI), Instituto de Ciências Exatas e Aplicadas (ICEA), Universidade Federal de Ouro Preto (UFOP) - Campus João Monlevade, João Monlevade, MG 35931-008, Brasil.
| | - Líliam César de Castro Medeiros
- Instituto de Ciência e Tecnologia, Universidade Estadual Paulista Júlio de Mesquita Filho (UNESP), São José dos Campos, SP 12247-004, Brasil.
| | - Clodoveu Augusto Davis Junior
- Departamento de Ciência da Computação (DCC), Instituto de Ciências Exatas (ICEx), Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG 31270-010, Brasil.
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Murugan K, Aruna P, Panneerselvam C, Madhiyazhagan P, Paulpandi M, Subramaniam J, Rajaganesh R, Wei H, Alsalhi MS, Devanesan S, Nicoletti M, Syuhei B, Canale A, Benelli G. Fighting arboviral diseases: low toxicity on mammalian cells, dengue growth inhibition (in vitro), and mosquitocidal activity of Centroceras clavulatum-synthesized silver nanoparticles. Parasitol Res 2016; 115:651-62. [PMID: 26462804 DOI: 10.1007/s00436-015-4783-6] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2015] [Accepted: 10/06/2015] [Indexed: 12/20/2022]
Abstract
Dengue is a mosquito-borne viral disease that has rapidly spread in all regions of the world in recent years. Female mosquitoes, mainly Aedes aegypti, transmit dengue. Approximately 3,900 million people, in 128 countries, are at risk of dengue infection. Recently, a focus has been provided on the potential of green-synthesized nanoparticles as inhibitors of the production of dengue viral envelope (E) protein in Vero cells and downregulators of the expression of dengue viral E gene. Algae are an outstanding reservoir of novel compounds, which may help in the fight against mosquito-borne diseases. In this research, silver nanoparticles (AgNP) were rapidly synthesized using a cheap extract of the alga Centroceras clavulatum. AgNP were characterized by UV–vis spectrophotometry, Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and X-ray diffraction (XRD). In mosquitocidal assays, LC50 values of C. clavulatum extract against A. aegypti larvae and pupae were 269.361 ppm (larva I), 309.698 ppm (larva II), 348.325 ppm (larva III), 387.637 ppm (larva IV), and 446.262 ppm (pupa). C. clavulatum extract also exhibited moderate antioxidant activity, both in 2,2-diphenyl-1-picrylhydrazyl (DPPH) and nitric oxide (NO) radical scavenging assays. LC50 values of C. clavulatum-synthesized AgNP were 21.460 ppm (larva I), 23.579 ppm (larva II), 25.912 ppm (larva III), 29.155 ppm (larva IV), and 33.877 ppm (pupa). Furthermore, C. clavulatum-synthesized AgNP inhibited dengue (serotype dengue virus type-2 (DEN-2)) viral replication in Vero cells. Notably, 50 μg/ml of green-synthesized AgNP showed no cytotoxicity on Vero cells while reduced DEN-2 viral growth of more than 80%; 12.5 μg/ml inhibited viral growth of more than 50%. Cellular internalization assays highlighted that untreated infected cells showed high intensity of fluorescence emission, which denotes high level of viral internalization. Conversely, AgNP-treated infected cells showed reduced levels of fluorescence, failing to show significant viral load. Overall, our study showed that alga-mediated synthesis of metal nanoparticles may be considered to develop newer, safer, and cheap tools in the fight against the dengue virus, serotype DEN-2, and its vector A. aegypti, with little cytotoxicity on mammalian cells.
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54
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Benelli G. Green synthesized nanoparticles in the fight against mosquito-borne diseases and cancer-a brief review. Enzyme Microb Technol 2016; 95:58-68. [PMID: 27866627 DOI: 10.1016/j.enzmictec.2016.08.022] [Citation(s) in RCA: 160] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2016] [Revised: 08/25/2016] [Accepted: 08/30/2016] [Indexed: 12/11/2022]
Abstract
Nanobiomedicine and parasitology are facing a number of key challenges, which mostly deal with the paucity of effective preventive and curative tools against mosquito-borne diseases and cancer. In this scenario, the employ of botanical and invertebrate extracts as reducing, stabilizing and capping agents for the synthesis of nanoparticles is advantageous over chemical and physical methods, since it is one-pot, cheap, and does not require high pressure, energy, temperature, or the use of highly toxic chemicals. Considering the overlooked connection between mosquito vector activity and the spread of cancer in USA, this review focused on the current knowledge available about green synthesized nanoparticles with efficacy against mosquito-borne diseases and cancer. Green fabricated metal nanoparticles showed antiplasmodial activity that often encompasses the efficacy of currently marked drugs for malaria treatment. They have been also reported as growth inhibitors against dengue virus (serotype DEN-2), with moderate cytotoxicity on mammalian cells. However, this feature is strongly dependent to the botanical agents employed during nanosynthesis. In addition, green nanoparticles have been successfully used to reduce mosquito young instar populations in the field. The final section focuses on some issues for future research, with special reference to the chemical standardization of the botanical extracts used for nanosynthesis and the potential effects on green fabricated nanoparticles on non-target organisms.
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Affiliation(s)
- Giovanni Benelli
- Insect Behavior Group, Department of Agriculture, Food and Environment, University of Pisa, via del Borghetto 80, 56124 Pisa, Italy; The BioRobotics Institute, Sant'Anna School of Advanced Studies, Viale Rinaldo Piaggio 34, 56025 Pontedera, Italy.
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55
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Abstract
Dengue is widespread throughout the tropics and local spatial variation in dengue virus transmission is strongly influenced by rainfall, temperature, urbanization and distribution of the principal mosquito vector Aedes aegypti. Currently, endemic dengue virus transmission is reported in the Eastern Mediterranean, American, South-East Asian, Western Pacific and African regions, whereas sporadic local transmission has been reported in Europe and the United States as the result of virus introduction to areas where Ae. aegypti and Aedes albopictus, a secondary vector, occur. The global burden of the disease is not well known, but its epidemiological patterns are alarming for both human health and the global economy. Dengue has been identified as a disease of the future owing to trends toward increased urbanization, scarce water supplies and, possibly, environmental change. According to the WHO, dengue control is technically feasible with coordinated international technical and financial support for national programmes. This Primer provides a general overview on dengue, covering epidemiology, control, disease mechanisms, diagnosis, treatment and research priorities.
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Affiliation(s)
- Maria G Guzman
- Institute of Tropical Medicine 'Pedro Kouri', PAHO/WHO Collaborating Center for the Study of Dengue and its Vector, Autopista Novia del Mediodia, Km 6 1/2, Havana 11400, Cuba
| | - Duane J Gubler
- Program in Emerging Infectious Diseases, Duke-NUS Graduate Medical School, Singapore
| | - Alienys Izquierdo
- Institute of Tropical Medicine 'Pedro Kouri', PAHO/WHO Collaborating Center for the Study of Dengue and its Vector, Autopista Novia del Mediodia, Km 6 1/2, Havana 11400, Cuba
| | - Eric Martinez
- Institute of Tropical Medicine 'Pedro Kouri', PAHO/WHO Collaborating Center for the Study of Dengue and its Vector, Autopista Novia del Mediodia, Km 6 1/2, Havana 11400, Cuba
| | - Scott B Halstead
- Department of Preventive Medicine and Biometrics, Uniformed Services University of the Health Sciences, Bethesda, Maryland, USA
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56
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Wang K, Wang J, Sun T, Bian G, Pan W, Feng T, Wang P, Li Y, Dai J. Glycosphingolipid GM3 is Indispensable for Dengue Virus Genome Replication. Int J Biol Sci 2016; 12:872-83. [PMID: 27313500 PMCID: PMC4910605 DOI: 10.7150/ijbs.15641] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2016] [Accepted: 05/03/2016] [Indexed: 01/08/2023] Open
Abstract
Dengue virus (DENV) causes the most prevalent arthropod-borne viral disease of humans worldwide. Glycosphingolipids (GSLs) are involved in virus infection by regulating various steps of viral-host interaction. However, the distinct role of GSLs during DENV infection remains unclear. In this study, we used mouse melanoma B16 cells and their GSL-deficient mutant counterpart GM95 cells to study the influence of GSLs on DENV infection. Surprisingly, GM95 cells were highly resistant to DENV infection compared with B16 cells. Pretreatment of B16 cells with synthetase inhibitor of GM3, the most abundant GSLs in B16 cells, or silencing GM3 synthetase T3GAL5, significantly inhibited DENV infection. DENV attachment and endocytosis were not impaired in GM95 cells, but DENV genome replication was obviously inhibited in GM95 cells compared to B16 cells. Furthermore, GM3 was colocalized with DENV viral replication complex on endoplasmic reticulum (ER) inside the B16 cells. Finally, GM3 synthetase inhibitor significantly reduced the mortality rate of suckling mice that challenged with DENV by impairing the viral replication in mouse brain. Taken together, these data indicated that GM3 was not required for DENV attachment and endocytosis, however, essential for viral genome replication. Targeting GM3 could be a novel strategy to inhibit DENV infection.
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Affiliation(s)
- Kezhen Wang
- 1. Institutes of Biology and Medical Sciences, Jiangsu Key Laboratory of Infection and Immunity, Soochow University, Suzhou 215123, P.R. China
| | - Juanjuan Wang
- 1. Institutes of Biology and Medical Sciences, Jiangsu Key Laboratory of Infection and Immunity, Soochow University, Suzhou 215123, P.R. China
| | - Ta Sun
- 1. Institutes of Biology and Medical Sciences, Jiangsu Key Laboratory of Infection and Immunity, Soochow University, Suzhou 215123, P.R. China
| | - Gang Bian
- 1. Institutes of Biology and Medical Sciences, Jiangsu Key Laboratory of Infection and Immunity, Soochow University, Suzhou 215123, P.R. China
| | - Wen Pan
- 1. Institutes of Biology and Medical Sciences, Jiangsu Key Laboratory of Infection and Immunity, Soochow University, Suzhou 215123, P.R. China
| | - Tingting Feng
- 1. Institutes of Biology and Medical Sciences, Jiangsu Key Laboratory of Infection and Immunity, Soochow University, Suzhou 215123, P.R. China
| | - Penghua Wang
- 2. Department of Microbiology and Immunology, New York Medical College, Valhalla, NY 10595, USA
| | - Yunsen Li
- 1. Institutes of Biology and Medical Sciences, Jiangsu Key Laboratory of Infection and Immunity, Soochow University, Suzhou 215123, P.R. China
| | - Jianfeng Dai
- 1. Institutes of Biology and Medical Sciences, Jiangsu Key Laboratory of Infection and Immunity, Soochow University, Suzhou 215123, P.R. China
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57
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The Role of Serotype Interactions and Seasonality in Dengue Model Selection and Control: Insights from a Pattern Matching Approach. PLoS Negl Trop Dis 2016; 10:e0004680. [PMID: 27159023 PMCID: PMC4861330 DOI: 10.1371/journal.pntd.0004680] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2015] [Accepted: 04/11/2016] [Indexed: 01/10/2023] Open
Abstract
The epidemiology of dengue fever is characterized by highly seasonal, multi-annual fluctuations, and the irregular circulation of its four serotypes. It is believed that this behaviour arises from the interplay between environmental drivers and serotype interactions. The exact mechanism, however, is uncertain. Constraining mathematical models to patterns characteristic to dengue epidemiology offers a means for detecting such mechanisms. Here, we used a pattern-oriented modelling (POM) strategy to fit and assess a range of dengue models, driven by combinations of temporary cross protective-immunity, cross-enhancement, and seasonal forcing, on their ability to capture the main characteristics of dengue dynamics. We show that all proposed models reproduce the observed dengue patterns across some part of the parameter space. Which model best supports the dengue dynamics is determined by the level of seasonal forcing. Further, when tertiary and quaternary infections are allowed, the inclusion of temporary cross-immunity alone is strongly supported, but the addition of cross-enhancement markedly reduces the parameter range at which dengue dynamics are produced, irrespective of the strength of seasonal forcing. The implication of these structural uncertainties on predicted vulnerability to control is also discussed. With ever expanding spread of dengue, greater understanding of dengue dynamics and control efforts (e.g. a near-future vaccine introduction) has become critically important. This study highlights the capacity of multi-level pattern-matching modelling approaches to offer an analytic tool for deeper insights into dengue epidemiology and control. The fluctuations of multi-serotype infectious diseases are often highly irregular and hard to predict. Previous theoretical approaches have attempted to disentangle the drivers that may underlie this behaviour in dengue dynamics with variable success. Here, we examine the role of such drivers using a pattern-oriented modelling (POM) approach. In POM, multiple patterns observed at different scales are used to test a model’s proficiency in capturing real-world dynamics. We examined dengue models with combinations of cross-immunity, cross-enhancement, seasonal fluctuations in the transmission rate, and with sensitivity analyses of asymmetric transmission rates between serotypes as well as the possibility for four subsequent heterologous infections. We demonstrate the ability of POM to model dynamical drivers that have gone unnoticed in single pattern or synthetic likelihood approaches. Further, our results present a determining role of seasonality in the selection and operation of these processes in governing dengue dynamics, in particular when full, heterologous immunity is assumed to occur after a secondary infection. We show that this structural model uncertainty can have important practical significance, as demonstrated by the differences in control efforts required to disrupt transmission. These results highlight the importance of localised model selection and calibration using multiple data-matching, as well as taking explicit account of model uncertainty in predicting and planning control efforts for multi-serotype diseases.
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58
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Pang EL, Loh HS. Current perspectives on dengue episode in Malaysia. ASIAN PAC J TROP MED 2016; 9:395-401. [PMID: 27086160 DOI: 10.1016/j.apjtm.2016.03.004] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2016] [Revised: 02/20/2016] [Indexed: 11/29/2022] Open
Abstract
Prevalence of dengue transmission has been alarmed by an estimate of 390 million infections per annum. Urban encroachment, ecological disruption and poor sanitation are all contributory factors of increased epidemiology. Complication however arises from the fact that dengue virus inherently exists as four different serotypes. Secondary infection is often manifested in the more severe form, such that antibody-dependent enhancement (ADE) could aggravate ailment by allowing pre-existing antibodies to form complexes with infecting viruses as means of intrusion. Consequently, increased viraemic titter and suppression of antiviral response are observed. Deep concerns are thus expressed in regards to escalating trend of hospitalisation and mortality rates. In Malaysia, situation is exacerbated by improper clinical management and pending vector control operations. As a preparedness strategy against the potential deadly dengue pandemic, the call for development of a durable and cost-effective dengue vaccine against all infecting serotypes is intensified. Even though several vaccine candidates are currently being evaluated in clinical trials, uncertainties in regards to serotypes interference, incomplete protection and dose adequacy have been raised. Instead of sole reliance on outsourcing, production of local vaccine should be considered in coherent to government's efforts to combat against dengue.
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Affiliation(s)
- Ee Leen Pang
- School of Biosciences, Faculty of Science, The University of Nottingham Malaysia Campus, Jalan Broga, 43500 Semenyih, Selangor, Malaysia
| | - Hwei-San Loh
- School of Biosciences, Faculty of Science, The University of Nottingham Malaysia Campus, Jalan Broga, 43500 Semenyih, Selangor, Malaysia; Biotechnology Research Centre, The University of Nottingham Malaysia Campus, Jalan Broga, 43500 Semenyih, Selangor, Malaysia.
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59
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Afreen N, Naqvi IH, Broor S, Ahmed A, Kazim SN, Dohare R, Kumar M, Parveen S. Evolutionary Analysis of Dengue Serotype 2 Viruses Using Phylogenetic and Bayesian Methods from New Delhi, India. PLoS Negl Trop Dis 2016; 10:e0004511. [PMID: 26977703 PMCID: PMC4792444 DOI: 10.1371/journal.pntd.0004511] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2015] [Accepted: 02/12/2016] [Indexed: 11/19/2022] Open
Abstract
Dengue fever is the most important arboviral disease in the tropical and sub-tropical countries of the world. Delhi, the metropolitan capital state of India, has reported many dengue outbreaks, with the last outbreak occurring in 2013. We have recently reported predominance of dengue virus serotype 2 during 2011-2014 in Delhi. In the present study, we report molecular characterization and evolutionary analysis of dengue serotype 2 viruses which were detected in 2011-2014 in Delhi. Envelope genes of 42 DENV-2 strains were sequenced in the study. All DENV-2 strains grouped within the Cosmopolitan genotype and further clustered into three lineages; Lineage I, II and III. Lineage III replaced lineage I during dengue fever outbreak of 2013. Further, a novel mutation Thr404Ile was detected in the stem region of the envelope protein of a single DENV-2 strain in 2014. Nucleotide substitution rate and time to the most recent common ancestor were determined by molecular clock analysis using Bayesian methods. A change in effective population size of Indian DENV-2 viruses was investigated through Bayesian skyline plot. The study will be a vital road map for investigation of epidemiology and evolutionary pattern of dengue viruses in India.
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Affiliation(s)
- Nazia Afreen
- Centre for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia, New Delhi, India
| | - Irshad H. Naqvi
- Dr. M.A. Ansari Health Centre, Jamia Millia Islamia, New Delhi, India
| | - Shobha Broor
- Department of Microbiology, All India Institute of Medical Sciences, New Delhi, India
| | - Anwar Ahmed
- Protein Research Chair, Department of Biochemistry, College of Science, King Saud University, Riyadh, Saudi Arabia
| | - Syed Naqui Kazim
- Centre for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia, New Delhi, India
| | - Ravins Dohare
- Centre for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia, New Delhi, India
| | - Manoj Kumar
- Centre for Culture, Media & Governance, Jamia Millia Islamia, New Delhi, India
| | - Shama Parveen
- Centre for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia, New Delhi, India
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60
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Plant-Synthesized Nanoparticles: An Eco-Friendly Tool Against Mosquito Vectors? NANOPARTICLES IN THE FIGHT AGAINST PARASITES 2016. [DOI: 10.1007/978-3-319-25292-6_8] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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61
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Leaungwutiwong P, Kelley JF, Sachair A, Jittmittraphap A, Luplertlop N. Relationship between MMP Expression and Virulence of Dengue Virus Type-2 in Infected Mosquito and Mammalian Cells. Jpn J Infect Dis 2016; 69:45-50. [DOI: 10.7883/yoken.jjid.2014.323] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Affiliation(s)
| | - James F. Kelley
- Department of Microbiology and Immunology, Faculty of Tropical Medicine, Mahidol University
- Department of Tropical Medicine, Medical Microbiology and Pharmacology, University of Hawaii John A. Burns School of Medicine
| | - Aucha Sachair
- Department of Microbiology and Immunology, Faculty of Tropical Medicine, Mahidol University
| | - Akanitt Jittmittraphap
- Department of Microbiology and Immunology, Faculty of Tropical Medicine, Mahidol University
| | - Natthanej Luplertlop
- Department of Microbiology and Immunology, Faculty of Tropical Medicine, Mahidol University
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62
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Genetic deviation in geographically close populations of the dengue vector Aedes aegypti (Diptera: Culicidae): influence of environmental barriers in South India. Parasitol Res 2015; 115:1149-60. [DOI: 10.1007/s00436-015-4847-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2015] [Accepted: 11/20/2015] [Indexed: 12/22/2022]
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63
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Establishment and Comparison of Two Different Diagnostic Platforms for Detection of DENV1 NS1 Protein. Int J Mol Sci 2015; 16:27850-64. [PMID: 26610481 PMCID: PMC4661927 DOI: 10.3390/ijms161126069] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2015] [Revised: 11/16/2015] [Accepted: 11/17/2015] [Indexed: 12/24/2022] Open
Abstract
Dengue virus (DENV) infection is currently at pandemic levels, with populations in tropical and subtropical regions at greatest risk of infection. Early diagnosis and management remain the cornerstone for good clinical outcomes, thus efficient and accurate diagnostic technology in the early stage of the disease is urgently needed. Serotype-specific monoclonal antibodies (mAbs) against the DENV1 nonstructural protein 1 (NS1), DA12-4, DA13-2, and DA15-3, which were recently generated using the hybridoma technique, are suitable for use in diagnostic platforms. Immunofluorescence assay (IFA), enzyme-linked immunosorbent assay (ELISA) and Western blot analysis further confirmed the serotype specificity of these three monoclonal antibodies. The ELISA-based diagnostic platform was established using the combination of two highly sensitive mAbs (DA15-3 and DB20-6). The same combination was also used for the flow cytometry-based diagnostic platform. We report here the detection limits of flow cytometry-based and ELISA-based diagnostic platforms using these mAbs to be 0.1 and 1 ng/mL, respectively. The collected clinical patient serum samples were also assayed by these two serotyping diagnostic platforms. The sensitivity and specificity for detecting NS1 protein of DENV1 are 90% and 96%, respectively. The accuracy of our platform for testing clinical samples is more advanced than that of the two commercial NS1 diagnostic platforms. In conclusion, our platforms are suitable for the early detection of NS1 protein in DENV1 infected patients.
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64
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Characterization and mosquitocidal potential of neem cake-synthesized silver nanoparticles: genotoxicity and impact on predation efficiency of mosquito natural enemies. Parasitol Res 2015; 115:1015-25. [DOI: 10.1007/s00436-015-4829-9] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2015] [Accepted: 11/10/2015] [Indexed: 12/28/2022]
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65
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Benelli G. Plant-mediated biosynthesis of nanoparticles as an emerging tool against mosquitoes of medical and veterinary importance: a review. Parasitol Res 2015; 115:23-34. [DOI: 10.1007/s00436-015-4800-9] [Citation(s) in RCA: 383] [Impact Index Per Article: 42.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2015] [Accepted: 10/19/2015] [Indexed: 01/11/2023]
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66
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Antiviral Potential of Algae Polysaccharides Isolated from Marine Sources: A Review. BIOMED RESEARCH INTERNATIONAL 2015; 2015:825203. [PMID: 26484353 PMCID: PMC4592888 DOI: 10.1155/2015/825203] [Citation(s) in RCA: 141] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/07/2015] [Revised: 06/07/2015] [Accepted: 06/15/2015] [Indexed: 12/22/2022]
Abstract
From food to fertilizer, algal derived products are largely employed in assorted industries, including agricultural, biomedical, food, and pharmaceutical industries. Among different chemical compositions isolated from algae, polysaccharides are the most well-established compounds, which were subjected to a variety of studies due to extensive bioactivities. Over the past few decades, the promising results for antiviral potential of algae-derived polysaccharides have advocated them as inordinate candidates for pharmaceutical research. Numerous studies have isolated various algal polysaccharides possessing antiviral activities, including carrageenan, alginate, fucan, laminaran, and naviculan. In addition, different mechanisms of action have been reported for these polysaccharides, such as inhibiting the binding or internalization of virus into the host cells or suppressing DNA replication and protein synthesis. This review strives for compiling previous antiviral studies of algae-derived polysaccharides and their mechanism of action towards their development as natural antiviral agents for future investigations.
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67
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Dayan GH, Galán-Herrera JF, Forrat R, Zambrano B, Bouckenooghe A, Harenberg A, Guy B, Lang J. Assessment of bivalent and tetravalent dengue vaccine formulations in flavivirus-naïve adults in Mexico. Hum Vaccin Immunother 2015; 10:2853-63. [PMID: 25483647 PMCID: PMC5443102 DOI: 10.4161/21645515.2014.972131] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Several ChimeriVax-Dengue (CYD)-based vaccination strategies were investigated as potential alternatives to vaccination with tetravalent CYD vaccine (CYD-TDV) in this phase IIa trial conducted in 2008–9 in 150 healthy adults. Participants were randomized and vaccinated on D0 and D105 (± 15 days). One group received bivalent CYD vaccine against serotypes 1 and 3 (CYD-1;3) on day 0 and CYD-2;4 on day 105 (±15 days). Two groups received an injection at each timepoint of a tetravalent blend of CYD-1;3;4 and a VERO cell derived, live attenuated vaccine against serotype 2 (VDV-2), or the reference CYD-TDV. A fourth group received Japanese encephalitis (JE) vaccine on days -14, -7 and 0, followed by CYD-TDV on day 105. Viraemia was infrequent in all groups. CYD-4 viraemia was most frequent after tetravalent vaccination, while CYD-3 viraemia was most frequent after the first bivalent vaccination. Immunogenicity as assessed by 50% plaque reduction neutralisation test on D28 was comparable after the first injection of either tetravalent vaccine, and increased after the second injection, particularly with the blended CYD-1;3;4/ VDV-2 vaccine. In the bivalent vaccine group, immune response against serotype 3 was highest and the second injection elicited a low immune response against CYD 2 and 4. Immune responses after the first injection of CYD-TDV in the JE-primed group were in general higher than after the first injection in the other groups. All tested regimens were well tolerated without marked differences between groups. Bivalent vaccination showed no advantage in terms of immunogenicity. Clinical trial registration number: NCT00740155
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Key Words
- ADE, antibody-dependent enhancement
- AE, adverse event
- ALT, aspartate aminotransferase
- AST, alanine aminotransferase
- CBA, cytometric bead array
- CI, confidence interval
- CPK, creatine phosphokinase
- CYD-TDV, CYD tetravalent dengue vaccine
- GMT, geometric mean titres
- ICS, intracellular cytokine staining
- IFN, interferon
- JE, Japanese encephalitis
- Japanese encephalitis
- LLOQ, lower limit of quantitation
- MOI, multiplicity of infection
- MedDRA, medical dictionary for regulatory activities
- PBMC, peripheral blood mononuclear cells
- PFU, plaque forming unit
- PRNT, plaque reduction neutralization test
- RT-PCR, reverse transcriptase-polymerase chain reaction
- TCID, tissue culture infectious dose
- VDV, vero-cell adapted attenuated dengue vaccine
- YF, yellow fever
- dengue
- flavivirus
- immunogenicity
- safety
- vaccine
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Affiliation(s)
- Gustavo H Dayan
- a Research and Development Department ; Sanofi Pasteur ; Swiftwater , PA USA
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Murugan K, Priyanka V, Dinesh D, Madhiyazhagan P, Panneerselvam C, Subramaniam J, Suresh U, Chandramohan B, Roni M, Nicoletti M, Alarfaj AA, Higuchi A, Munusamy MA, Khater HF, Messing RH, Benelli G. Predation by Asian bullfrog tadpoles, Hoplobatrachus tigerinus, against the dengue vector, Aedes aegypti, in an aquatic environment treated with mosquitocidal nanoparticles. Parasitol Res 2015; 114:3601-10. [PMID: 26091763 DOI: 10.1007/s00436-015-4582-0] [Citation(s) in RCA: 75] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2015] [Accepted: 06/11/2015] [Indexed: 12/21/2022]
Abstract
Aedes aegypti is a primary vector of dengue and chikungunya. The use of synthetic insecticides to control Aedes populations often leads to high operational costs and adverse non-target effects. Botanical extracts have been proposed for rapid extracellular synthesis of mosquitocidal nanoparticles, but their impact against predators of mosquito larvae has not been well studied. We propose a single-step method for the biosynthesis of silver nanoparticles (AgNP) using the extract of Artemisia vulgaris leaves as a reducing and stabilizing agent. AgNP were characterized by UV-vis spectroscopy, Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and X-ray diffraction (XRD). SEM and XRD showed that AgNP were polydispersed, crystalline, irregularly shaped, with a mean size of 30-70 nm. EDX confirmed the presence of elemental silver. FTIR highlighted that the functional groups from plant metabolites capped AgNP, stabilizing them over time. We investigated the mosquitocidal properties of A. vulgaris leaf extract and green-synthesized AgNP against larvae and pupae of Ae. aegypti. We also evaluated the predatory efficiency of Asian bullfrog tadpoles, Hoplobatrachus tigerinus, against larvae of Ae. aegypti, under laboratory conditions and in an aquatic environment treated with ultra-low doses of AgNP. AgNP were highly toxic to Ae. aegypti larval instars (I-IV) and pupae, with LC50 ranging from 4.4 (I) to 13.1 ppm (pupae). In the lab, the mean number of prey consumed per tadpole per day was 29.0 (I), 26.0 (II), 21.4 (III), and 16.7 (IV). After treatment with AgNP, the mean number of mosquito prey per tadpole per day increased to 34.2 (I), 32.4 (II), 27.4 (III), and 22.6 (IV). Overall, this study highlights the importance of a synergistic approach based on biocontrol agents and botanical nano-insecticides for mosquito control.
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Affiliation(s)
- Kadarkarai Murugan
- Division of Entomology, Department of Zoology, School of Life sciences, Bharathiar University, Coimbatore, 641 046, Tamil Nadu, India
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69
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Sujitha V, Murugan K, Paulpandi M, Panneerselvam C, Suresh U, Roni M, Nicoletti M, Higuchi A, Madhiyazhagan P, Subramaniam J, Dinesh D, Vadivalagan C, Chandramohan B, Alarfaj AA, Munusamy MA, Barnard DR, Benelli G. Green-synthesized silver nanoparticles as a novel control tool against dengue virus (DEN-2) and its primary vector Aedes aegypti. Parasitol Res 2015; 114:3315-25. [PMID: 26063530 DOI: 10.1007/s00436-015-4556-2] [Citation(s) in RCA: 122] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2015] [Accepted: 05/25/2015] [Indexed: 12/29/2022]
Abstract
Dengue is an arthropod-borne viral infection mainly vectored through the bite of Aedes mosquitoes. Recently, its transmission has strongly increased in urban and semi-urban areas of tropical and sub-tropical regions worldwide, becoming a major international public health concern. There is no specific treatment for dengue. Its prevention and control solely depends on effective vector control measures. In this study, we proposed the green-synthesis of silver nanoparticles (AgNP) as a novel and effective tool against the dengue serotype DEN-2 and its major vector Aedes aegypti. AgNP were synthesized using the Moringa oleifera seed extract as reducing and stabilizing agent. AgNP were characterized using a variety of biophysical methods including UV-vis spectroscopy, Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), and sorted for size categories. AgNP showed in vitro antiviral activity against DEN-2 infecting vero cells. Viral titer was 7 log10 TCID50/ml in control (AgNP-free), while it dropped to 3.2 log10 TCID50/ml after a single treatment with 20 μl/ml of AgNP. After 6 h, DEN-2 yield was 5.8 log10 PFU/ml in the control, while it was 1.4 log10 PFU/ml post-treatment with AgNP (20 μl/ml). AgNP were highly effective against the dengue vector A. aegypti, with LC50 values ranging from 10.24 ppm (I instar larvae) to 21.17 ppm (pupae). Overall, this research highlighted the concrete potential of green-synthesized AgNP in the fight against dengue and its primary vector A. aegypti. Further research on structure-activity relationships of AgNP against other dengue serotypes is urgently required.
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Affiliation(s)
- Vasu Sujitha
- Division of Entomology, Department of Zoology, School of Life sciences, Bharathiar University, Coimbatore, 641 046, Tamil Nadu, India
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Modelling the immunological response to a tetravalent dengue vaccine from multiple phase-2 trials in Latin America and South East Asia. Vaccine 2015; 33:3746-51. [PMID: 26051515 PMCID: PMC4504002 DOI: 10.1016/j.vaccine.2015.05.059] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2015] [Revised: 05/05/2015] [Accepted: 05/22/2015] [Indexed: 11/21/2022]
Abstract
Background The most advanced dengue vaccine candidate is a live-attenuated recombinant vaccine containing the four dengue viruses on the yellow fever vaccine backbone (CYD-TDV) developed by Sanofi Pasteur. Several analyses have been published on the safety and immunogenicity of the CYD-TDV vaccine from single trials but none modelled the heterogeneity observed in the antibody responses elicited by the vaccine. Methods We analyse the immunogenicity data collected in five phase-2 trials of the CYD-TDV vaccine. We provide a descriptive analysis of the aggregated datasets and fit the observed post-vaccination PRNT50 titres against the four dengue (DENV) serotypes using multivariate regression models. Results We find that the responses to CYD-TDV are principally predicted by the baseline immunological status against DENV, but the trial is also a significant predictor. We find that the CYD-TDV vaccine generates similar titres against all serotypes following the third dose, though DENV4 is immunodominant after the first dose. Conclusions This study contributes to a better understanding of the immunological responses elicited by CYD-TDV. The recent availability of phase-3 data is a unique opportunity to further investigate the immunogenicity and efficacy of the CYD-TDV vaccine, especially in subjects with different levels of pre-existing immunity against DENV. Modelling multiple immunological outcomes with a single multivariate model offers advantages over traditional approaches, capturing correlations between response variables, and the statistical method adopted in this study can be applied to a variety of infections with interacting strains.
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71
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Himatt S, Osman KE, Okoued SI, Seidahmed OE, Beatty ME, Soghaier MA, Elmusharaf K. Sero-prevalence of dengue infections in the Kassala state in the eastern part of the Sudan in 2011. J Infect Public Health 2015; 8:487-92. [PMID: 25975993 DOI: 10.1016/j.jiph.2015.04.023] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2014] [Revised: 03/11/2015] [Accepted: 04/03/2015] [Indexed: 11/26/2022] Open
Abstract
Dengue fever is a vector-borne disease that is transmitted to humans by infected Aedes aegypti mosquitoes. The eastern part of the Sudan is one of the regions that is affected by dengue virus circulation. In this study, we estimated the prevalence of dengue infections in the Kassala state in the eastern part of the Sudan. The study objective was to estimate the sero-prevalence of dengue IgG/IgM antibodies in the Kassala locality in 2011. This was a cross sectional community-based study that utilized a multi-stage cluster sampling technique regarding the probability sampling the study participants. Capture ELISA serological techniques were used for both IgM and IgG, with the specific cut-offs for each set by the manufacturer. The prevalence of dengue infection was found to be 9.4% (95% CI: 7.1-12.3). In conclusion, there is evidence that the dengue virus is being transmitted in Kassala. Disease surveillance, including the clinical, serological and entomological components, should be strengthened, and additional epidemiological studies are needed to better understand of the disease burden and effects in the area.
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Affiliation(s)
- Sayed Himatt
- Directorate of Epidemiology and Zoonotic Diseases, Federal Ministry of Health, Khartoum, Sudan
| | - Kamal E Osman
- Al Ribat University, Faculty of the Medicine Community Department, Sudan; Tiabah University, College of Medicine Family and Community Medicine, Saudi Arabia
| | - Somia I Okoued
- Emergency and Humanitarian Action, Federal Ministry of Health, Khartoum, Sudan
| | - Osama E Seidahmed
- Department of Medical Entomology, National Public Health Laboratory, Khartoum, Sudan
| | - Mark E Beatty
- Pediatric Dengue Vaccine Initiative, Republic of Korea
| | - Mohammed A Soghaier
- Directorate of Epidemiology and Zoonotic Diseases, Federal Ministry of Health, Khartoum, Sudan.
| | - Khalifa Elmusharaf
- Department of Epidemiology and Public Health Medicine, The Royal College of Surgeons in Ireland, Bahrain
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72
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Shetty V, Sanil D, Shetty NJ. Inheritance Pattern of Temephos Resistance, an Organophosphate Insecticide, in Aedes aegypti (L.). GENETICS RESEARCH INTERNATIONAL 2015; 2015:181872. [PMID: 25861478 PMCID: PMC4378319 DOI: 10.1155/2015/181872] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/22/2014] [Accepted: 01/05/2015] [Indexed: 01/16/2023]
Abstract
The present paper reports the mode of inheritance of resistance in laboratory induced temephos resistant and susceptible strains of Ae. aegypti. Homozygous resistant and susceptible strains of Ae. aegypti were generated by selective inbreeding at a diagnostic dose of 0.02 mg/L of temephos. Genetic crosses were carried out between these strains to determine the inheritance pattern of temephos resistance. The log-dosage probit mortality relationships and degree of dominance (D) were calculated. The dosage-mortality (d-m) line of the F 1 generation was nearer to the resistant parent than the susceptible one. The "D" value was calculated as 0.15 indicating that the temephos resistant gene is incompletely dominant. The d-m lines of the F 2 generation and progeny from the backcross exhibited clear plateaus of mortality across a range of doses indicating that temephos resistance is controlled by a single gene. Comparison of the mortality data with the theoretical expectations using the χ (2) test revealed no significant difference, confirming a monogenic pattern of inheritance. In conclusion, the study provides evidence that the temephos resistance in Ae. aegypti follows an incompletely dominant and monogenic mode of inheritance.
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Affiliation(s)
- Vinaya Shetty
- Centre for Applied Genetics, Bangalore University, Jnana Bharathi Campus, Bengaluru 560056, India
| | - Deepak Sanil
- Centre for Applied Genetics, Bangalore University, Jnana Bharathi Campus, Bengaluru 560056, India
| | - N. J. Shetty
- Centre for Applied Genetics, Bangalore University, Jnana Bharathi Campus, Bengaluru 560056, India
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73
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Bhakat S, Delang L, Kaptein S, Neyts J, Leyssen P, Jayaprakash V. Reaching beyond HIV/HCV: nelfinavir as a potential starting point for broad-spectrum protease inhibitors against dengue and chikungunya virus. RSC Adv 2015. [DOI: 10.1039/c5ra14469h] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Re-purposing HIV/HCV inhibitors against DENV and CHIKV using computer aided drug design.
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Affiliation(s)
| | - Leen Delang
- KU Leuven – University of Leuven
- Department of Microbiology and Immunology
- Rega Institute for Medical Research
- Laboratory of Virology and Chemotherapy
- B-3000 Leuven
| | - Suzanne Kaptein
- KU Leuven – University of Leuven
- Department of Microbiology and Immunology
- Rega Institute for Medical Research
- Laboratory of Virology and Chemotherapy
- B-3000 Leuven
| | - Johan Neyts
- KU Leuven – University of Leuven
- Department of Microbiology and Immunology
- Rega Institute for Medical Research
- Laboratory of Virology and Chemotherapy
- B-3000 Leuven
| | - Pieter Leyssen
- KU Leuven – University of Leuven
- Department of Microbiology and Immunology
- Rega Institute for Medical Research
- Laboratory of Virology and Chemotherapy
- B-3000 Leuven
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Bouzid M, Colón-González FJ, Lung T, Lake IR, Hunter PR. Climate change and the emergence of vector-borne diseases in Europe: case study of dengue fever. BMC Public Health 2014; 14:781. [PMID: 25149418 PMCID: PMC4143568 DOI: 10.1186/1471-2458-14-781] [Citation(s) in RCA: 95] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2014] [Accepted: 07/24/2014] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND Dengue fever is the most prevalent mosquito-borne viral disease worldwide. Dengue transmission is critically dependent on climatic factors and there is much concern as to whether climate change would spread the disease to areas currently unaffected. The occurrence of autochthonous infections in Croatia and France in 2010 has raised concerns about a potential re-emergence of dengue in Europe. The objective of this study is to estimate dengue risk in Europe under climate change scenarios. METHODS We used a Generalized Additive Model (GAM) to estimate dengue fever risk as a function of climatic variables (maximum temperature, minimum temperature, precipitation, humidity) and socioeconomic factors (population density, urbanisation, GDP per capita and population size), under contemporary conditions (1985-2007) in Mexico. We then used our model estimates to project dengue incidence under baseline conditions (1961-1990) and three climate change scenarios: short-term 2011-2040, medium-term 2041-2070 and long-term 2071-2100 across Europe. The model was used to calculate average number of yearly dengue cases at a spatial resolution of 10 × 10 km grid covering all land surface of the currently 27 EU member states. To our knowledge, this is the first attempt to model dengue fever risk in Europe in terms of disease occurrence rather than mosquito presence. RESULTS The results were presented using Geographical Information System (GIS) and allowed identification of areas at high risk. Dengue fever hot spots were clustered around the coastal areas of the Mediterranean and Adriatic seas and the Po Valley in northern Italy. CONCLUSIONS This risk assessment study is likely to be a valuable tool assisting effective and targeted adaptation responses to reduce the likely increased burden of dengue fever in a warmer world.
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Affiliation(s)
- Maha Bouzid
- />Norwich Medical School, University of East Anglia, Norwich, UK
| | - Felipe J Colón-González
- />School of Environmental Sciences, University of East Anglia, Norwich, UK
- />The Abdus Salam International Centre for Theoretical Physics, Earth System Physics Section, Trieste, Italy
| | - Tobias Lung
- />Joint Research Centre, European Commission, Institute for Environment and Sustainability, Ispra, Italy
- />European Environment Agency, Copenhagen, Denmark
| | - Iain R Lake
- />School of Environmental Sciences, University of East Anglia, Norwich, UK
| | - Paul R Hunter
- />Norwich Medical School, University of East Anglia, Norwich, UK
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75
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Shepherd SM, Shoff WH. Vaccination for the expatriate and long-term traveler. Expert Rev Vaccines 2014; 13:775-800. [DOI: 10.1586/14760584.2014.913485] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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76
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Lam SK. Challenges in reducing dengue burden; diagnostics, control measures and vaccines. Expert Rev Vaccines 2014; 12:995-1010. [PMID: 24053394 DOI: 10.1586/14760584.2013.824712] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Dengue is a major public health concern worldwide, with the number of infections increasing globally. The illness imposes the greatest economic and human burden on developing countries that have limited resources to deal with the scale of the problem. No cure for dengue exists; treatment is limited to rehydration therapy, and with vector control strategies proving to be relatively ineffective, a vaccine is an urgent priority. Despite the numerous challenges encountered in the development of a dengue vaccine, several vaccine candidates have shown promise in clinical development and it is believed that a vaccination program would be at least as cost-effective as current vector control programs. The lead candidate vaccine is a tetravalent, live attenuated, recombinant vaccine, which is currently in Phase III clinical trials. Vaccine introduction is a complex process that requires consideration and is discussed here. This review discusses the epidemiology, burden and pathogenesis of dengue, as well as the vaccine candidates currently in clinical development.
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Affiliation(s)
- Sai Kit Lam
- Office of the Vice-Chancellor, University of Malaya, Jalan Pantai Baru, 50603, Kuala Lumpur, Malaysia +60 17 8800044 +60 37 7259635
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Wan SW, Lu YT, Huang CH, Lin CF, Anderson R, Liu HS, Yeh TM, Yen YT, Wu-Hsieh BA, Lin YS. Protection against dengue virus infection in mice by administration of antibodies against modified nonstructural protein 1. PLoS One 2014; 9:e92495. [PMID: 24658118 PMCID: PMC3962419 DOI: 10.1371/journal.pone.0092495] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2013] [Accepted: 02/21/2014] [Indexed: 12/18/2022] Open
Abstract
BACKGROUND Infection with dengue virus (DENV) may cause life-threatening disease with thrombocytopenia and vascular leakage which are related to dysfunction of platelets and endothelial cells. We previously showed that antibodies (Abs) against DENV nonstructural protein 1 (NS1) cross-react with human platelets and endothelial cells, leading to functional disturbances. Based on sequence homology analysis, the C-terminal region of DENV NS1 protein contains cross-reactive epitopes. For safety in vaccine development, the cross-reactive epitopes of DENV NS1 protein should be deleted or modified. METHODOLOGY/PRINCIPAL FINDINGS We tested the protective effects of Abs against full-length DENV NS1, NS1 lacking the C-terminal amino acids (a.a.) 271-352 (designated ΔC NS1), and chimeric DJ NS1 consisting of N-terminal DENV NS1 (a.a. 1-270) and C-terminal Japanese encephalitis virus NS1 (a.a. 271-352). The anti-ΔC NS1 and anti-DJ NS1 Abs showed a lower binding activity to endothelial cells and platelets than that of anti-DENV NS1 Abs. Passive immunization with anti-ΔC NS1 and anti-DJ NS1 Abs reduced DENV-induced prolonged mouse tail bleeding time. Treatment with anti-DENV NS1, anti-ΔC NS1 and anti-DJ NS1 Abs reduced local skin hemorrhage, controlled the viral load of DENV infection in vivo, synergized with complement to inhibit viral replication in vitro, as well as abolished DENV-induced macrophage infiltration to the site of skin inoculation. Moreover, active immunization with modified NS1 protein, but not with unmodified DENV NS1 protein, reduced DENV-induced prolonged bleeding time, local skin hemorrhage, and viral load. CONCLUSIONS/SIGNIFICANCE These results support the idea that modified NS1 proteins may represent an improved strategy for safe and effective vaccine development against DENV infection.
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Affiliation(s)
- Shu-Wen Wan
- Center of Infectious Disease and Signaling Research, National Cheng Kung University, Tainan, Taiwan
- Department of Microbiology and Immunology, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Yi-Tien Lu
- Department of Microbiology and Immunology, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Chia-Hui Huang
- Department of Microbiology and Immunology, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Chiou-Feng Lin
- Center of Infectious Disease and Signaling Research, National Cheng Kung University, Tainan, Taiwan
- Department of Microbiology and Immunology, College of Medicine, National Cheng Kung University, Tainan, Taiwan
- Institute of Clinical Medicine, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Robert Anderson
- Department of Microbiology and Immunology, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Hsiao-Sheng Liu
- Center of Infectious Disease and Signaling Research, National Cheng Kung University, Tainan, Taiwan
- Department of Microbiology and Immunology, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Trai-Ming Yeh
- Center of Infectious Disease and Signaling Research, National Cheng Kung University, Tainan, Taiwan
- Department of Medical Laboratory Science and Biotechnology, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Yu-Ting Yen
- Graduate Institute of Immunology, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Betty A. Wu-Hsieh
- Graduate Institute of Immunology, College of Medicine, National Taiwan University, Taipei, Taiwan
- * E-mail: (BAWH); (YSL)
| | - Yee-Shin Lin
- Center of Infectious Disease and Signaling Research, National Cheng Kung University, Tainan, Taiwan
- Department of Microbiology and Immunology, College of Medicine, National Cheng Kung University, Tainan, Taiwan
- * E-mail: (BAWH); (YSL)
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Pitaksajjakul P, Benjathummarak S, Pipattanaboon C, Wongwit W, Okabayashi T, Kuhara M, Misaki R, Fujiyama K, Ramasoota P. Antibody germline characterization of cross-neutralizing human IgGs against 4 serotypes of dengue virus. Biochem Biophys Res Commun 2014; 446:475-80. [PMID: 24637211 PMCID: PMC7092929 DOI: 10.1016/j.bbrc.2014.02.131] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2014] [Accepted: 02/27/2014] [Indexed: 12/01/2022]
Abstract
Dengue virus (DENV), a re-emerging virus, constitutes the largest vector-borne disease virus, with 50-100 million cases reported every year. Although DENV infection induces lifelong immunity against viruses of the same serotypes, the subsequent infection with the heterologous serotypes can cause more severe form of the disease, such as Dengue Haemorrhagic Fever (DHF) or Dengue Shock Syndrome (DSS). However, there is neither approved vaccine nor specific drugs available to treat this disease. In this study, previously developed 19 human monoclonal antibodies (HuMAbs) showing strong to moderate cross neutralizing activity were selected. Most of them (13/19) were targeted to domain II of envelop glycoprotein. To understand and clarify the recognition properties, the maturation mechanisms comprising Variable/Diversity/Joining (VDJ) recombination, Variable Heavy (VH)/Variable Light (VL) chain pairing, variability at junctional site, and somatic hypermutation (SHM) of those antibodies were studied and compared with their predecessor germline sequences. IMGT/V-QUEST database was applied to analyze the isolated VH and VL sequences. To confirm the correction of isolated VH/VL, 3 HuMAbs (1A10H7, 1B3B9, 1G7C2) was transiently expressed in HEK293T cell. All three clones of the expressed recombinant IgG (rIgG) showed the same binding and neutralizing activity as same as those from hybridomas. The data obtained in this study will elucidate the properties of those HuMAbs for further genetic modification, and its binding epitopes.
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Affiliation(s)
- Pannamthip Pitaksajjakul
- Center of Excellence for Antibody Research (CEAR), Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand; Department of Social and Environmental Medicine, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Surachet Benjathummarak
- Center of Excellence for Antibody Research (CEAR), Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Chonlatip Pipattanaboon
- Center of Excellence for Antibody Research (CEAR), Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Waranya Wongwit
- Department of Social and Environmental Medicine, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Tamaki Okabayashi
- Mahidol Osaka Center for Infectious Diseases, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand; Medical & Biological Laboratories Corporation, Ltd., Ina, Nagano, Japan
| | - Motoki Kuhara
- Medical & Biological Laboratories Corporation, Ltd., Ina, Nagano, Japan
| | - Ryo Misaki
- International Center for Biotechnology, Osaka University, Japan
| | | | - Pongrama Ramasoota
- Center of Excellence for Antibody Research (CEAR), Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand; Department of Social and Environmental Medicine, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand.
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Wang P, Li LF, Wang QY, Shang LQ, Shi PY, Yin Z. Anti-dengue-virus activity and structure-activity relationship studies of lycorine derivatives. ChemMedChem 2014; 9:1522-33. [PMID: 24574246 PMCID: PMC7162318 DOI: 10.1002/cmdc.201300505] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2013] [Indexed: 11/13/2022]
Abstract
Dengue is a systemic viral infection that is transmitted to humans by Aedes mosquitoes. No vaccines or specific therapeutics are currently available for dengue. Lycorine, which is a natural plant alkaloid, has been shown to possess antiviral activities against flaviviruses. In this study, a series of novel lycorine derivatives were synthesized and assayed for their inhibition of dengue virus (DENV) in cell cultures. Among the lycorine analogues, 1‐acetyllycorine exhibited the most potent anti‐DENV activity (EC50=0.4 μm) with a reduced cytotoxicity (CC50>300 μm), which resulted in a selectivity index (CC50/EC50) of more than 750. The ketones 1‐acetyl‐2‐oxolycorine (EC50=1.8 μm) and 2‐oxolycorine (EC50=0.5 μm) also exhibited excellent antiviral activities with low cytotoxicity. Structure–activity relationships for the lycorine derivatives against DENV are discussed. A three‐dimensional quantitative structure–activity relationship model was established by using a comparative molecular‐field analysis protocol in order to rationalize the experimental results. Further modifications of the hydroxy group at the C1 position with retention of a ketone at the C2 position could potentially lead to inhibitors with improved overall properties.
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Affiliation(s)
- Peng Wang
- Department of Chemistry, Nankai University, Tianjin 300071 (P.R. China); State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin 300071 (P.R. China)
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80
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[Vaccinations for international travelers]. Internist (Berl) 2014; 55:246, 248-50, 252-4, 256-8. [PMID: 24519704 DOI: 10.1007/s00108-013-3365-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Vaccinations are a prominent part of health preparations before international travel. They can avoid or significantly reduce the risk of numerous infectious diseases. Until recently, vaccination against yellow fever was the only obligatory vaccination. However, according to updated international health regulations, other vaccinations and prophylactic measures may be required at entry from certain countries. For all routine vaccinations as recommended in Germany, necessary revaccination and catch-up of missed vaccinations should be administered before travel. At most destinations the risk of infection is higher than in Germany. Hepatitis A vaccine is generally recommended for travelers to areas of increased risk, polio vaccine for all destinations where eradication is not yet confirmed (Asia and Africa). The indications for other travel vaccines must take into consideration travel destination and itinerary, type and duration of travel, individual risk of exposure as well as the epidemiology of the disease to be prevented. Several vaccines of potential interest for travel medicine, e.g., new vaccines against malaria and dengue fever, are under development.
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81
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Induction of neutralizing antibodies against four serotypes of dengue viruses by MixBiEDIII, a tetravalent dengue vaccine. PLoS One 2014; 9:e86573. [PMID: 24466156 PMCID: PMC3897746 DOI: 10.1371/journal.pone.0086573] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2013] [Accepted: 12/12/2013] [Indexed: 01/14/2023] Open
Abstract
The worldwide expansion of four serotypes of dengue virus (DENV) poses great risk to global public health. Several vaccine candidates are under development. However, none is yet available for humans. In the present study, a novel strategy to produce tetravalent DENV vaccine based on envelope protein domain III (EDIII) was proposed. Tandem EDIIIs of two serotypes (type 1-2 and type 3-4) of DENV connected by a Gly-Ser linker ((Gly4Ser)3) were expressed in E. coli, respectively. Then, the two bivalent recombinant EDIIIs were equally mixed to form the tetravalent vaccine candidate MixBiEDIII, and used to immunize BALB/c mice. The results showed that specific IgG and neutralizing antibodies against all four serotypes of DENV were successfully induced in the MixBiEDIII employing Freund adjuvant immunized mice. Furthermore, in the suckling mouse model, sera from mice immunized with MixBiEDIII provided significant protection against four serotypes of DENV challenge. Our data demonstrated that MixBiEDIII, as a novel form of subunit vaccine candidates, might have the potential to be further developed as a tetravalent dengue vaccine in the near future.
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82
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Rodrigues HS, Monteiro MTT, Torres DFM. Vaccination models and optimal control strategies to dengue. Math Biosci 2014; 247:1-12. [PMID: 24513243 DOI: 10.1016/j.mbs.2013.10.006] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2012] [Revised: 05/21/2013] [Accepted: 10/14/2013] [Indexed: 02/05/2023]
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83
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Jindal H, Bhatt B, Malik JS, SK S. Dengue vaccine: a valuable asset for the future. Hum Vaccin Immunother 2014; 10:2245-6. [PMID: 25424928 PMCID: PMC4896803 DOI: 10.4161/hv.28953] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2014] [Accepted: 04/20/2014] [Indexed: 11/19/2022] Open
Abstract
Dengue has emerged as one of the major global public health problems. The disease has broken out of its shell and has spread due to increased international travel and climatic changes. Globally, over 2.5 billion people accounting for >40% of the world's population are at risk from dengue. Since the 1940s, dengue vaccines have been under investigation. A live-attenuated tetravalent vaccine based on chimeric yellow fever-dengue virus (CYD-TDV) has progressed to phase III efficacy studies. Dengue vaccine has been found to be a cost-effective intervention to reduce morbidity and mortality. Current dengue vaccine candidates aim to protect against the 4 dengue serotypes, but the recent discovery of a fifth serotype could complicate vaccine development. In recent years, an urgent need has been felt for a vaccine to prevent the morbidity and mortality from this disease in a cost-effective way.
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Affiliation(s)
| | - Bhumika Bhatt
- Department of Community Medicine; PGIMS; Rohtak, Haryana, India
| | | | - Shashikantha SK
- Department of Community Medicine; PGIMS; Rohtak, Haryana, India
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84
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Saokaew N, Poungpair O, Panya A, Tarasuk M, Sawasdee N, Limjindaporn T, Chaicumpa W, Yenchitsomanus P. Human monoclonal single-chain antibodies specific to dengue virus envelope protein. Lett Appl Microbiol 2013; 58:270-7. [DOI: 10.1111/lam.12186] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2013] [Revised: 10/20/2013] [Accepted: 10/23/2013] [Indexed: 11/29/2022]
Affiliation(s)
- N. Saokaew
- Division of Molecular Medicine; Department of Research and Development; Faculty of Medicine Siriraj Hospital; Mahidol University; Bangkok Thailand
- Graduate Program in Immunology; Department of Immunology; Faculty of Medicine Siriraj Hospital; Mahidol University; Bangkok Thailand
| | - O. Poungpair
- Division of Molecular Medicine; Department of Research and Development; Faculty of Medicine Siriraj Hospital; Mahidol University; Bangkok Thailand
| | - A. Panya
- Division of Molecular Medicine; Department of Research and Development; Faculty of Medicine Siriraj Hospital; Mahidol University; Bangkok Thailand
- Graduate Program in Biochemistry; Department of Biochemistry; Faculty of Medicine Siriraj Hospital; Mahidol University; Bangkok Thailand
| | - M. Tarasuk
- Division of Molecular Medicine; Department of Research and Development; Faculty of Medicine Siriraj Hospital; Mahidol University; Bangkok Thailand
| | - N. Sawasdee
- Division of Molecular Medicine; Department of Research and Development; Faculty of Medicine Siriraj Hospital; Mahidol University; Bangkok Thailand
| | - T. Limjindaporn
- Department of Anatomy; Faculty of Medicine Siriraj Hospital; Mahidol University; Bangkok Thailand
| | - W. Chaicumpa
- Laboratory for Research and Technology Development; Department of Parasitology; Faculty of Medicine Siriraj Hospital; Mahidol University; Bangkok Thailand
| | - P. Yenchitsomanus
- Division of Molecular Medicine; Department of Research and Development; Faculty of Medicine Siriraj Hospital; Mahidol University; Bangkok Thailand
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85
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Soghaier MA, Mahmood SF, Pasha O, Azam SI, Karsani MM, Elmangory MM, Elmagboul BA, Okoued SI, Shareef SM, Khogali HS, Eltigai E. Factors associated with dengue fever IgG sero-prevalence in South Kordofan State, Sudan, in 2012: Reporting prevalence ratios. J Infect Public Health 2013; 7:54-61. [PMID: 24210245 DOI: 10.1016/j.jiph.2013.07.008] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2013] [Accepted: 07/06/2013] [Indexed: 11/28/2022] Open
Abstract
BACKGROUND Dengue fever (DF) is a vector-borne virus transmitted to humans by infected Aedes mosquitoes. In this study, we identified the most important factors associated with the prevalence of IgG antibodies in a border state between Sudan and the new republic of South Sudan. OBJECTIVES To quantify the association of specific factors with the prevalence of DF IgG antibodies in Lagawa among subjects aged 16-60 years in 2012. METHODOLOGY Analytical cross-sectional community-based study conducted in Lagawa in 2012. RESULTS Indoor mosquito breeding was the most significant predictor affecting DF IgG serology. Household water storage was also strongly associated with the presence of IgG antibodies. Residence in urban areas, younger age and a history of travel to the Red Sea State were significant predictors of DF IgG seroprevalence in South Kordofan state. CONCLUSION Indoor (household) behaviors associated with DF infection should be modified to mitigate the infection risk in the study area. Awareness should be raised regarding DF in Lagawa to ensure community participation in all control measures, and the surveillance system at the border between Sudan and the republic of South Sudan should be strengthened.
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Affiliation(s)
- Mohammed A Soghaier
- Directorate of Epidemiology and Zoonotic Disease, Sudan Federal Ministry of Health, Sudan.
| | - Syed F Mahmood
- Community Health Sciences/Internal Medicine Departments, The Aga Khan University, Karachi, Pakistan
| | - Omrana Pasha
- Community Health Sciences/Internal Medicine Departments, The Aga Khan University, Karachi, Pakistan
| | - Syed I Azam
- Community Health Sciences/Internal Medicine Departments, The Aga Khan University, Karachi, Pakistan
| | | | | | - Babiker A Elmagboul
- Directorate of Epidemiology and Zoonotic Disease, Sudan Federal Ministry of Health, Sudan
| | - Somia I Okoued
- Emergency Humanitarian Actions EHA, Sudan Federal Ministry of Health, Sudan
| | - Sayed M Shareef
- Public Health Institute, Sudan Federal Ministry of Health, Sudan
| | - Hayat S Khogali
- Directorate of Epidemiology and Zoonotic Disease, Sudan Federal Ministry of Health, Sudan
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86
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Ndeffo Mbah ML, Durham DP, Medlock J, Galvani AP. Country- and age-specific optimal allocation of dengue vaccines. J Theor Biol 2013; 342:15-22. [PMID: 24161462 DOI: 10.1016/j.jtbi.2013.10.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2012] [Revised: 10/09/2013] [Accepted: 10/16/2013] [Indexed: 10/26/2022]
Abstract
Several dengue vaccines are under development, and some are expected to become available imminently. Concomitant with the anticipated release of these vaccines, vaccine allocation strategies for dengue-endemic countries in Southeast Asia and Latin America are currently under development. We developed a model of dengue transmission that incorporates the age-specific distributions of dengue burden corresponding to those in Thailand and Brazil, respectively, to determine vaccine allocations that minimize the incidence of dengue hemorrhagic fever, taking into account limited availability of vaccine doses in the initial phase of production. We showed that optimal vaccine allocation strategies vary significantly with the demographic burden of dengue hemorrhagic fever. Consequently, the strategy that is optimal for one country may be sub-optimal for another country. More specifically, we showed that, during the first years following introduction of a dengue vaccine, it is optimal to target children for dengue mass vaccination in Thailand, whereas young adults should be targeted in Brazil.
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Affiliation(s)
- Martial L Ndeffo Mbah
- School of Public Health, Yale University Suite 200, 135 College Street, New Haven, CT 06510, USA.
| | - David P Durham
- School of Public Health, Yale University Suite 200, 135 College Street, New Haven, CT 06510, USA
| | - Jan Medlock
- Department of Biomedical Sciences, Oregon State University, Corvallis, OR, USA
| | - Alison P Galvani
- School of Public Health, Yale University Suite 200, 135 College Street, New Haven, CT 06510, USA
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87
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Jang YS. A bacterium's guide to orienteering in the intestinal lumen. Interview by Emma Louise Walton. Microbes Infect 2013; 15:845-8. [PMID: 24140556 DOI: 10.1016/j.micinf.2013.10.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2013] [Accepted: 10/08/2013] [Indexed: 11/25/2022]
Affiliation(s)
- Yong-Suk Jang
- Université Paris 7, UMR7216 Epigenetics and Cell Fate, 35 rue Hélène Brion, Paris 75013, France.
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88
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Torresi J, Tapia-Conyer R, Margolis H. Preparing for dengue vaccine introduction: recommendations from the 1st dengue v2V International Meeting. PLoS Negl Trop Dis 2013; 7:e2261. [PMID: 24086776 PMCID: PMC3784468 DOI: 10.1371/journal.pntd.0002261] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Affiliation(s)
- Joseph Torresi
- Austin Health and University of Melbourne, Victoria, Australia
- * E-mail:
| | | | - Harold Margolis
- Centers for Disease Control and Prevention, San Juan, Puerto Rico
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89
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Lee SH, Tang YQ, Rathkrishnan A, Wang SM, Ong KC, Manikam R, Payne BJ, Jaganath IB, Sekaran SD. Effects of cocktail of four local Malaysian medicinal plants (Phyllanthus spp.) against dengue virus 2. Altern Ther Health Med 2013; 13:192. [PMID: 23889893 PMCID: PMC3726501 DOI: 10.1186/1472-6882-13-192] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2013] [Accepted: 07/24/2013] [Indexed: 11/22/2022]
Abstract
Background The absence of commercialized vaccines and antiviral agents against dengue has made the disease a major health concern around the world. With the current dengue virus transmission rate and incidences, the development of antiviral drugs is of vital need. The aim of this project was to evaluate the possibility of developing a local medicinal plant, Phyllanthus as an anti-dengue agent. Methods Cocktail (aqueous and methanolic) extracts were prepared from four species of Phyllanthus (P.amarus, P.niruri, P.urinaria, and P.watsonii) and their polyphenolic compounds were identified via HPLC and LC-MS/MS analysis. MTS assay was then carried out to determine the maximal non-toxic dose (MNTD) of the extracts, followed by screening of the in vitro antiviral activity of aqueous cocktail extracts against DENV2 by means of time-of-addition (pre-, simultaneous and post-) using RT-qPCR. The differentially expressed proteins in the treated and infected cells were analysed with two dimensional gel electrophoresis experiments. Results Several active compounds including gallic acid, geraniin, syringin, and corilagen have been identified. The MNTD of both aqueous and methanolic extracts on Vero cells were 250.0 μg/ml and 15.63 μg/ml respectively. Phyllanthus showed strongest inhibitory activity against DENV2 with more than 90% of virus reduction in simultaneous treatment. Two-dimensional analysis revealed significantly altered levels of thirteen proteins, which were successfully identified by tandem MS (MS/MS). These altered proteins were involved in several biological processes, including viral entry, viral transcription and translation regulations, cytoskeletal assembly, and cellular metabolisms. Conclusions Phyllanthus could be potentially developed as an anti-DENV agent.
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90
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Wan SW, Lin CF, Wang S, Chen YH, Yeh TM, Liu HS, Anderson R, Lin YS. Current progress in dengue vaccines. J Biomed Sci 2013; 20:37. [PMID: 23758699 PMCID: PMC3686670 DOI: 10.1186/1423-0127-20-37] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2013] [Accepted: 05/13/2013] [Indexed: 01/23/2023] Open
Abstract
Dengue is one of the most important emerging vector-borne viral diseases. There are four serotypes of dengue viruses (DENV), each of which is capable of causing self-limited dengue fever (DF) or even life-threatening dengue hemorrhagic fever (DHF) and dengue shock syndrome (DSS). The major clinical manifestations of severe DENV disease are vascular leakage, thrombocytopenia, and hemorrhage, yet the detailed mechanisms are not fully resolved. Besides the direct effects of the virus, immunopathological aspects are also involved in the development of dengue symptoms. Although no licensed dengue vaccine is yet available, several vaccine candidates are under development, including live attenuated virus vaccines, live chimeric virus vaccines, inactivated virus vaccines, and live recombinant, DNA and subunit vaccines. The live attenuated virus vaccines and live chimeric virus vaccines are undergoing clinical evaluation. The other vaccine candidates have been evaluated in preclinical animal models or are being prepared for clinical trials. For the safety and efficacy of dengue vaccines, the immunopathogenic complications such as antibody-mediated enhancement and autoimmunity of dengue disease need to be considered.
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Affiliation(s)
- Shu-Wen Wan
- Department of Microbiology and Immunology, National Cheng Kung University Medical College, Tainan, Taiwan
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91
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Isoe J, Scaraffia PY. Urea synthesis and excretion in Aedes aegypti mosquitoes are regulated by a unique cross-talk mechanism. PLoS One 2013; 8:e65393. [PMID: 23755226 PMCID: PMC3673916 DOI: 10.1371/journal.pone.0065393] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2013] [Accepted: 04/29/2013] [Indexed: 12/12/2022] Open
Abstract
Aedes aegypti mosquitoes do not have a typical functional urea cycle for ammonia disposal such as the one present in most terrestrial vertebrates. However, they can synthesize urea by two different pathways, argininolysis and uricolysis. We investigated how formation of urea by these two pathways is regulated in females of A. aegypti. The expression of arginase (AR) and urate oxidase (UO), either separately or simultaneously (ARUO) was silenced by RNAi. The amounts of several nitrogen compounds were quantified in excreta using mass spectrometry. Injection of mosquitoes with either dsRNA-AR or dsRNA-UO significantly decreased the expressions of AR or UO in the fat body (FB) and Malpighian tubules (MT). Surprisingly, the expression level of AR was increased when UO was silenced and vice versa, suggesting a cross-talk regulation between pathways. In agreement with these data, the amount of urea measured 48 h after blood feeding remained unchanged in those mosquitoes injected with dsRNA-AR or dsRNA-UO. However, allantoin significantly increased in the excreta of dsRNA-AR-injected females. The knockdown of ARUO mainly led to a decrease in urea and allantoin excretion, and an increase in arginine excretion. In addition, dsRNA-AR-injected mosquitoes treated with a specific nitric oxide synthase inhibitor showed an increase of UO expression in FB and MT and a significant increase in the excretion of nitrogen compounds. Interestingly, both a temporary delay in the digestion of a blood meal and a significant reduction in the expression of several genes involved in ammonia metabolism were observed in dsRNA-AR, UO or ARUO-injected females. These results reveal that urea synthesis and excretion in A. aegypti are tightly regulated by a unique cross-talk signaling mechanism. This process allows blood-fed mosquitoes to regulate the synthesis and/or excretion of nitrogen waste products, and avoid toxic effects that could result from a lethal concentration of ammonia in their tissues.
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Affiliation(s)
- Jun Isoe
- Department of Chemistry and Biochemistry, The Center for Insect Science, The University of Arizona, Tucson, Arizona, United States of America
| | - Patricia Y. Scaraffia
- Department of Chemistry and Biochemistry, The Center for Insect Science, The University of Arizona, Tucson, Arizona, United States of America
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92
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Elahi M, Islam MM, Noguchi K, Yohda M, Kuroda Y. High resolution crystal structure of dengue-3 envelope protein domain III suggests possible molecular mechanisms for serospecific antibody recognition. Proteins 2013; 81:1090-5. [PMID: 23239402 DOI: 10.1002/prot.24237] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2012] [Revised: 11/20/2012] [Accepted: 11/21/2012] [Indexed: 11/08/2022]
Abstract
Dengue viruses are classified into four serotypes. Here, we report a 1.7 Å crystal structure of a recombinant dengue-3 envelope protein domain III (ED3), which contains most of the putative epitopes. Although the fold was well conserved, we found that a local backbone deformation in the first β-strand, which contains the putative epitope-1, occurred upon domain isolation. Furthermore, a comparison with dengue-2 ED3 indicated a large structural change by as much as 4.0 Å at Asp(662), located in epitope-2. These minute structural and surface properties changes observed in the high resolution ED3 structure represent potential determinants for serospecificity and epitope recognition by antibodies.
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Affiliation(s)
- Montasir Elahi
- Department of Biotechnology and Life Science, Graduate School of Engineering, Tokyo University of Agriculture and Technology, Koganei-shi, Tokyo, Japan
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93
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Yang J, Zou L, Hu Z, Chen W, Zhang J, Zhu J, Fang X, Yuan W, Hu X, Hu F, Rao X. Identification and characterization of a 43 kDa actin protein involved in the DENV-2 binding and infection of ECV304 cells. Microbes Infect 2013; 15:310-8. [DOI: 10.1016/j.micinf.2013.01.004] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2012] [Revised: 12/24/2012] [Accepted: 01/17/2013] [Indexed: 11/15/2022]
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The synergistic effect of combined immunization with a DNA vaccine and chimeric yellow fever/dengue virus leads to strong protection against dengue. PLoS One 2013; 8:e58357. [PMID: 23472186 PMCID: PMC3589436 DOI: 10.1371/journal.pone.0058357] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2012] [Accepted: 02/06/2013] [Indexed: 12/13/2022] Open
Abstract
The dengue envelope glycoprotein (E) is the major component of virion surface and its ectodomain is composed of domains I, II and III. This protein is the main target for the development of a dengue vaccine with induction of neutralizing antibodies. In the present work, we tested two different vaccination strategies, with combined immunizations in a prime/booster regimen or simultaneous inoculation with a DNA vaccine (pE1D2) and a chimeric yellow fever/dengue 2 virus (YF17D-D2). The pE1D2 DNA vaccine encodes the ectodomain of the envelope DENV2 protein fused to t-PA signal peptide, while the YF17D-D2 was constructed by replacing the prM and E genes from the 17D yellow fever vaccine virus by those from DENV2. Balb/c mice were inoculated with these two vaccines by different prime/booster or simultaneous immunization protocols and most of them induced a synergistic effect on the elicited immune response, mainly in neutralizing antibody production. Furthermore, combined immunization remarkably increased protection against a lethal dose of DENV2, when compared to each vaccine administered alone. Results also revealed that immunization with the DNA vaccine, regardless of the combination with the chimeric virus, induced a robust cell immune response, with production of IFN-γ by CD8+ T lymphocytes.
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95
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Dengue virus therapeutic intervention strategies based on viral, vector and host factors involved in disease pathogenesis. Pharmacol Ther 2013; 137:266-82. [DOI: 10.1016/j.pharmthera.2012.10.007] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2012] [Accepted: 10/15/2012] [Indexed: 12/27/2022]
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96
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Rothan HA, Han HC, Ramasamy TS, Othman S, Rahman NA, Yusof R. Inhibition of dengue NS2B-NS3 protease and viral replication in Vero cells by recombinant retrocyclin-1. BMC Infect Dis 2012; 12:314. [PMID: 23171075 PMCID: PMC3575220 DOI: 10.1186/1471-2334-12-314] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2012] [Accepted: 11/19/2012] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Global resurgence of dengue virus infections in many of the tropical and subtropical countries is a major concern. Therefore, there is an urgent need for the development of successful drugs that are both economical and offer a long-lasting protection. The viral NS2B-NS3 serine protease (NS2B-NS3pro) is a promising target for the development of drug-like inhibitors, which are not available at the moment. In this study, we report retrocyclin-1 (RC-1) production in E. coli as a recombinant peptide to test against dengue NS2B-NS3pro. METHODS Dengue NS2B-NS3pro was produced as a recombinant single chain protein in E. coli and purified by Ni+ affinity chromatography. The RC-1 peptide was produced in E. coli and the tri-disulphide bonds were reformed in a diluted alkaline environment. Protease assay was performed using a fluorogenic peptide substrate and measured by fluorescence spectrometry. Real-time PCR was used for quantification of dengue serotype 2 (DENV-2) viral RNA produced in Vero cells. RESULTS The RC-1 peptide inhibited the activity of recombinant NS2B-NS3pro with different values at 50% inhibitory concentration (IC50) which are temperature dependent (28°C, 46.1 ± 1.7 μM; 37°C, 21.4 ± 1.6 μM; 40°C, 14.1 ± 1.2 μM). The presence of RC-1 significantly reduced viral replication in Vero cells infected with DENV-2 at simultaneous treatment after 48 hrs (70%) and 75 hrs (85%). Furthermore, moderate reduction in viral replication was observed at pre-treatment mode after 48 hrs (40%) and 72 hrs (38%) and post-treatment at 48 hrs (30%) and 72 hrs (45%). CONCLUSION Recombinant RC-1 inhibits DENV-2 replication in Vero cells by interfering with the activity of its serine protease. Thus, we propose that recombinant RC-1 is a potent, cost-effective dengue virus inhibitor. Therefore, it is suitable to consider RC-1 as a new candidate for drug development against dengue infection.
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Affiliation(s)
- Hussin A Rothan
- Department of Molecular Medicine, Faculty of Medicine, University of Malaya, 50603, Kuala Lumpur, Malaysia.
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97
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Identification of B cell epitopes of dengue virus 2 NS3 protein by monoclonal antibody. Appl Microbiol Biotechnol 2012; 97:1553-60. [PMID: 23081772 DOI: 10.1007/s00253-012-4419-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2012] [Revised: 08/28/2012] [Accepted: 09/04/2012] [Indexed: 10/27/2022]
Abstract
Dengue virus is a major international public health concern, and there is a lack of available effective vaccines. Virus-specific epitopes could help in developing epitope peptide vaccine. Previously, a neutralizing monoclonal antibody (mAb) 4F5 against nonstructural protein 3 (NS3) of dengue virus 2 (DV2) was developed in our lab. In this work, the B cell epitope recognized by mAb 4F5 was identified using the phage-displayed peptide library. The results of the binding assay and competitive inhibition assay indicated that the peptides, residues 460-469 (U460-469 RVGRNPKNEN) of DV2 NS3 protein, were the B cell epitopes recognized by mAb 4F5. Furthermore, the epitope peptides and a control peptide were synthesized and then immunized female BALB/c mice. ELISA analysis showed that immunization with synthesized epitope peptide elicited a high level of antibody in mice, and immunofluorescent staining showed that the antisera from fusion epitope-immunized mice also responded to DV2 NS3 protein, which further characterized the specific response of the present epitope peptide. Therefore, the present work revealed the specificity of the newly identified epitope (U460-469) of DV2 NS3 protein, which may shed light on dengue virus (DV) vaccine design, DV pathogenesis study, and even DV diagnostic reagent development.
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98
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Santos NDDL, de Moura KS, Napoleão TH, Santos GKN, Coelho LCBB, Navarro DMDAF, Paiva PMG. Oviposition-stimulant and ovicidal activities of Moringa oleifera lectin on Aedes aegypti. PLoS One 2012; 7:e44840. [PMID: 22970317 PMCID: PMC3435276 DOI: 10.1371/journal.pone.0044840] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2012] [Accepted: 08/07/2012] [Indexed: 11/18/2022] Open
Abstract
Background Natural insecticides against the vector mosquito Aedes aegypti have been the object of research due to their high level of eco-safety. The water-soluble Moringa oleifera lectin (WSMoL) is a larvicidal agent against A. aegypti. This work reports the effects of WSMoL on oviposition and egg hatching of A. aegypti. Methodology/Principal Findings WSMoL crude preparations (seed extract and 0–60 protein fraction), at 0.1 mg/mL protein concentration, did not affect oviposition, while A. aegypti gravid females laid their eggs preferentially (73%) in vessels containing isolated WSMoL (0.1 mg/mL), compared with vessels containing only distilled water (control). Volatile compounds were not detected in WSMoL preparation. The hatchability of fresh eggs deposited in the solutions in the oviposition assay was evaluated. The numbers of hatched larvae in seed extract, 0–60 protein fraction and WSMoL were 45±8.7 %, 20±11 % and 55±7.5 %, respectively, significantly (p<0.05) lower than in controls containing only distilled water (75–95%). Embryos were visualized inside fresh control eggs, but not within eggs that were laid and maintained in WSMoL solution. Ovicidal activity was also assessed using stored A. aegypti eggs. The protein concentrations able to reduce the hatching rate by 50% (EC50) were 0.32, 0.16 and 0.1 mg/mL for seed extract, 0–60 protein fraction and WSMoL, respectively. The absence of hatching of stored eggs treated with WSMoL at 0.3 mg/mL (EC99) after transfer to medium without lectin indicates that embryos within the eggs were killed by WSMoL. The reduction in hatching rate of A. aegypti was not linked to decrease in bacteria population. Conclusions/Significance WSMoL acted both as a chemical stimulant cue for ovipositing females and ovicidal agent at a given concentration. The oviposition-stimulant and ovicidal activities, combined with the previously reported larvicidal activity, make WSMoL a very interesting candidate in integrated A. aegypti control.
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Affiliation(s)
- Nataly Diniz de Lima Santos
- Departamento de Bioquímica, Centro de Ciências Biológicas, Universidade Federal de Pernambuco, Cidade Universitária, Recife, Pernambuco, Brazil
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99
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Lanata CF, Andrade T, Gil AI, Terrones C, Valladolid O, Zambrano B, Saville M, Crevat D. Immunogenicity and safety of tetravalent dengue vaccine in 2–11 year-olds previously vaccinated against yellow fever: Randomized, controlled, phase II study in Piura, Peru. Vaccine 2012; 30:5935-41. [DOI: 10.1016/j.vaccine.2012.07.043] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2012] [Revised: 07/05/2012] [Accepted: 07/18/2012] [Indexed: 11/29/2022]
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100
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Schein CH, Bowen DM, Lewis JA, Choi K, Paul A, van der Heden van Noort GJ, Lu W, Filippov DV. Physicochemical property consensus sequences for functional analysis, design of multivalent antigens and targeted antivirals. BMC Bioinformatics 2012; 13 Suppl 13:S9. [PMID: 23320474 PMCID: PMC3426803 DOI: 10.1186/1471-2105-13-s13-s9] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
Background Analysis of large sets of biological sequence data from related strains or organisms is complicated by superficial redundancy in the set, which may contain many members that are identical except at one or two positions. Thus a new method, based on deriving physicochemical property (PCP)-consensus sequences, was tested for its ability to generate reference sequences and distinguish functionally significant changes from background variability. Methods The PCP consensus program was used to automatically derive consensus sequences starting from sequence alignments of proteins from Flaviviruses (from the Flavitrack database) and human enteroviruses, using a five dimensional set of Eigenvectors that summarize over 200 different scalar values for the PCPs of the amino acids. A PCP-consensus protein of a Dengue virus envelope protein was produced recombinantly and tested for its ability to bind antibodies to strains using ELISA. Results PCP-consensus sequences of the flavivirus family could be used to classify them into five discrete groups and distinguish areas of the envelope proteins that correlate with host specificity and disease type. A multivalent Dengue virus antigen was designed and shown to bind antibodies against all four DENV types. A consensus enteroviral VPg protein had the same distinctive high pKa as wild type proteins and was recognized by two different polymerases. Conclusions The process for deriving PCP-consensus sequences for any group of aligned similar sequences, has been validated for sequences with up to 50% diversity. Ongoing projects have shown that the method identifies residues that significantly alter PCPs at a given position, and might thus cause changes in function or immunogenicity. Other potential applications include deriving target proteins for drug design and diagnostic kits.
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Affiliation(s)
- Catherine H Schein
- Institute for Translational Sciences, Computational Biology, Sealy Center for Structural Biology and Molecular Biophysics, University of Texas Medical Branch, Texas 77555-0857, USA.
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