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Dengue vaccine

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https://www.readbyqxmd.com/read/28649242/an-approach-for-a-synthetic-ctl-vaccine-design-against-zika-flavivirus-using-class-i-and-class-ii-epitopes-identified-by-computer-modeling
#1
Edecio Cunha-Neto, Daniela S Rosa, Paul E Harris, Tim Olson, Alex Morrow, Serban Ciotlos, Charles V Herst, Reid Martin Rubsamen
The threat posed by severe congenital abnormalities related to Zika virus (ZKV) infection during pregnancy has turned development of a ZKV vaccine into an emergency. Recent work suggests that the cytotoxic T lymphocyte (CTL) response to infection is an important defense mechanism in response to ZKV. Here, we develop the rationale and strategy for a new approach to developing cytotoxic T lymphocyte (CTL) vaccines for ZKV flavivirus infection. The proposed approach is based on recent studies using a protein structure computer model for HIV epitope selection designed to select epitopes for CTL attack optimized for viruses that exhibit antigenic drift...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28648861/preparing-clinicians-for-re-emerging-arbovirus-infectious-diseases-in-europe
#2
REVIEW
Louise Sigfrid, Chantal Reusken, Isabella Eckerle, Veronique Nussenblatt, Sam Lipworth, Janey Messina, Moritz Kraemer, Onder Ergonul, Anna Papa, Marion Koopmans, Peter Horby
BACKGROUND: Arthropod-borne virus (Arbovirus) infections are considered an emerging threat for Europe, with an increase in cases in recent decades. The increase in global travel and trade has contributed to the introduction of vectors and viruses into new geographical areas. Tropical arboviruses such as dengue and chikungunya have re-emerged causing local, sporadic outbreaks ignited by travel-imported cases. The recent Zika virus outbreak in the Americas highlighted a need to strengthen preparedness to (re-)emerging arbovirus infections globally...
June 22, 2017: Clinical Microbiology and Infection
https://www.readbyqxmd.com/read/28648850/complete-genome-analysis-of-dengue-virus-type-3-isolated-from-the-2013-dengue-outbreak-in-yunnan-china
#3
Xiaodan Wang, Dehong Ma, Xinwei Huang, Lihua Li, Duo Li, Yujiao Zhao, Lijuan Qiu, Yue Pan, Junying Chen, Juemin Xi, Xiyun Shan, Qiangming Sun
In the past few decades, dengue has spread rapidly and is an emerging disease in China. An unexpected dengue outbreak occurred in Xishuangbanna, Yunnan, China, resulting in 1331 patients in 2013. In order to obtain the complete genome information and perform mutation and evolutionary analysis of causative agent related to this largest outbreak of dengue fever. The viruses were isolated by cell culture and evaluated by genome sequence analysis. Phylogenetic trees were then constructed by Neighbor-Joining methods (MEGA6...
June 22, 2017: Virus Research
https://www.readbyqxmd.com/read/28645716/guide-to-active-vaccine-safety-surveillance-report-of-cioms-working-group-on-vaccine-safety-executive-summary
#4
U Heininger, K Holm, I Caplanusi, S R Bailey
In 2013, the Council for International Organizations of Medical Sciences (CIOMS) created a Working Group on Vaccine Safety (WG) to address unmet needs in the area of vaccine pharmacovigilance. Generating reliable data about specific vaccine safety concerns is becoming a priority due to recent progress in the development and deployment of new vaccines of global importance, as well as novel vaccines targeting diseases specifically endemic to many resource-limited countries (RLCs), e.g. malaria, dengue. The WG created a Guide to Active Vaccine Safety Surveillance (AVSS) to assist national regulatory authorities and national immunization program officers in RLCs in determining the best course of action with regards to non-routine pharmacovigilance activities, when confronted with a launch of a new vaccine or a vaccine that is new to their country...
June 20, 2017: Vaccine
https://www.readbyqxmd.com/read/28637753/structural-mimicry-of-the-dengue-virus-envelope-glycoprotein-revealed-by-the-crystallographic-study-of-an-idiotype-anti-idiotype-fab-complex
#5
Yee Hwa Wong, Boon Chong Goh, She Yah Lim, En Wei Teo, Angeline P C Lim, Pete C Dedon, Brendon J Hanson, Paul A MacAry, Julien Lescar
A detailed understanding of the fine specificity of serotype-specific human antibodies is vital for the development and evaluation of new vaccines for pathogenic Flaviviruses such as Dengue virus (DENV) and Zika virus. In this study, we thoroughly characterize the structural footprint of an anti-idiotype antibody (E1) specific for a potent, fully human DENV serotype 1-specific antibody termed HM14c10, derived from a recovered patient. The crystal structure at a resolution of 2.5 Å of a complex between the Fab fragments of E1 and HM14c10 provides the first detailed molecular comparison of an anti-idiotype paratope specific for a human antibody with its analogous epitope- a discontinuous quaternary structure located at the surface of the viral particle that spans adjacent envelope (E) proteins...
June 21, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28632829/-advances-in-dengue-virus-research-in-colombia-the-role-of-cellular-micrornas-as-an-anti-dengue-virus-response
#6
Juan Camilo Castrillón-Betancur, Silvio Urcuqui-Inchima
Dengue is one of the most important mosquito-borne diseases, and its incidence has increased at an alarming rate in recent years, becoming a real public health problem. Currently, there is no vaccine or medication or proper treatment for dengue control. Considering this situation, it is necessary to prioritize the search for new alternatives and strategies for dengue prevention and control, in order to reduce not only the economic burden of endemic countries, but also to improve the quality of life of patients...
April 2017: Revista Chilena de Infectología: órgano Oficial de la Sociedad Chilena de Infectología
https://www.readbyqxmd.com/read/28625589/acute-disseminated-encephalomyelitis-in-dengue-viral-infection
#7
REVIEW
Wan Aliaa Wan Sulaiman, Liyana Najwa Inche Mat, Hasnur Zaman Hashim, Fan Kee Hoo, Siew Mooi Ching, Ramachandran Vasudevan, Mohd Hazmi Mohamed, Hamidon Basri
Dengue is the most common arboviral disease affecting many countries worldwide. An RNA virus from the flaviviridae family, dengue has four antigenically distinct serotypes (DEN-1-DEN-4). Neurological involvement in dengue can be classified into dengue encephalopathy immune-mediated syndromes, encephalitis, neuromuscular or dengue muscle dysfunction and neuro-ophthalmic involvement. Acute disseminated encephalomyelitis (ADEM) is an immune mediated acute demyelinating disorder of the central nervous system following recent infection or vaccination...
June 15, 2017: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/28623027/ade-and-dengue-vaccination
#8
Ruth Aralí Martínez-Vega, Gabriel Carrasquila, Expedito Luna, José Ramos-Castañeda
The vaccine against Dengue virus (DENV), Dengvaxia® (CYD), produced by Sanofi-Pasteur, has been registered by several national regulatory agencies; nevertheless, the performance and security of this vaccine have been challenged in a series of recent papers. In this work, we intend to contribute to the debate by analyzing the concept of an enhancing vaccine, presenting objections to the epidemiological model base of the concept and, likewise, presenting data that contradict that concept.
June 13, 2017: Vaccine
https://www.readbyqxmd.com/read/28620207/dengue-virus-activates-cgas-through-the-release-of-mitochondrial-dna
#9
Bo Sun, Karin B Sundström, Jun Jie Chew, Pradeep Bist, Esther S Gan, Hwee Cheng Tan, Kenneth C Goh, Tanu Chawla, Choon Kit Tang, Eng Eong Ooi
Cyclic GMP-AMP synthetase (cGAS) is a DNA-specific cytosolic sensor, which detects and initiates host defense responses against microbial DNA. It is thus curious that a recent study identified cGAS as playing important roles in inhibiting positive-sense single-stranded RNA (+ssRNA) viral infection, especially since RNA is not known to activate cGAS. Using a dengue virus serotype 2 (DENV-2) vaccine strain (PDK53), we show that infection creates an endogenous source of cytosolic DNA in infected cells through the release of mitochondrial DNA (mtDNA) to drive the production of cGAMP by cGAS...
June 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28614803/delineating-antibody-recognition-against-zika-virus-during-natural-infection
#10
Lei Yu, Ruoke Wang, Fei Gao, Min Li, Jianying Liu, Jian Wang, Wenxin Hong, Lingzhai Zhao, Yingfen Wen, Chibiao Yin, Hua Wang, Qi Zhang, Yangyang Li, Panpan Zhou, Rudian Zhang, Yang Liu, Xiaoping Tang, Yongjun Guan, Cheng-Feng Qin, Ling Chen, Xuanling Shi, Xia Jin, Gong Cheng, Fuchun Zhang, Linqi Zhang
Zika virus (ZIKV) is an emerging mosquito-transmitted flavivirus that shares a considerable degree of homology with dengue virus (DENV). Here, we examined longitudinal antibody response against ZIKV during natural infection in 2 convalescent individuals. By decomposing the antibody recognition into DI/DII and DIII of the E glycoprotein, we showed their development in humans followed a spatiotemporal hierarchy. Plasma binding to DI/DII appeared to peak and wane during early infection with extensive cross-reactivity with DI/DII of DENV...
June 15, 2017: JCI Insight
https://www.readbyqxmd.com/read/28612239/dengue-hemorrhagic-fever-a-state-of-the-art-review-focused-in-pulmonary-involvement
#11
REVIEW
Renata Rocha de Almeida, Bernardo Paim, Solange Artimos de Oliveira, Arthur Soares Souza, Antônio Carlos Portugal Gomes, Dante Luiz Escuissato, Gláucia Zanetti, Edson Marchiori
Dengue fever is an arboviral disease transmitted to humans through the bites of infected female Aedes mosquitoes. Dengue virus is a member of the Flaviviridae family, and human infection can be caused by any of the four antigenically distinct serotypes (DENV 1-4). The infection has become recognized as the most important and prevalent arboviral disease in humans, endemic in almost 100 countries worldwide. Nearly 3 billion people live in areas with transmission risk. Autochthonous transmission of the virus in previously disease-free areas, increased incidence in endemic areas, and epidemic resurgence in controlled regions could increase the risk of contracting more severe forms of the disease, such as dengue hemorrhagic fever (DHF)/dengue shock syndrome (DSS)...
June 13, 2017: Lung
https://www.readbyqxmd.com/read/28604254/detection-phenotyping-and-quantification-of-dengue-virus-specific-b-cells-using-fluorescent-probes
#12
Heather Friberg, Anuja Mathew
Dengue viruses are some of the most important mosquito-borne pathogens worldwide. They cause illness in 50-100 million individuals per year and have a significant global health impact in low- and middle-income countries. It is important to improve our understanding of the humoral response to dengue virus, as antibodies (Abs) are associated with protection from or susceptibility to severe dengue disease. In recent years, significant advances have been made toward identifying Ab targets and evaluating the functional properties of Abs...
June 12, 2017: Human Vaccines & Immunotherapeutics
https://www.readbyqxmd.com/read/28603864/ediii-denv3-nanospheres-drive-immature-dendritic-cells-into-a-mature-phenotype-in-an-in-vitro-model
#13
Nattika Nantachit, Panya Sunintaboon, Sukathida Ubol
Domain III of E protein of DENV is one of the targets for vaccine development. Unfortunately, this protein-based platform has generally low immunogenicity. To circumvent this problem, we investigated the use of an adjuvant-nanoparticle delivery system to facilitate immunogenicity of soluble DENV-EDIII protein. One of the key features of this delivery system is its ability to simultaneously deliver antigens and exert adjuvanticity to specialized immune cells. In this study, we generated N-trimethyl chitosan (TMC) nanoparticles (NPs) to be used as adjuvant and carrier for the soluble E-domain III of dengue virus serotype 3 (sEDIII-D3)...
June 12, 2017: Microbiology and Immunology
https://www.readbyqxmd.com/read/28600536/imipramine-inhibits-chikungunya-virus-replication-in-human-skin-fibroblasts-through-interference-with-intracellular-cholesterol-trafficking
#14
Sineewanlaya Wichit, Rodolphe Hamel, Eric Bernard, Loïc Talignani, Fodé Diop, Pauline Ferraris, Florian Liegeois, Peeraya Ekchariyawat, Natthanej Luplertlop, Pornapat Surasombatpattana, Frédéric Thomas, Andres Merits, Valérie Choumet, Pierre Roques, Hans Yssel, Laurence Briant, Dorothée Missé
Chikungunya virus (CHIKV) is an emerging arbovirus of the Togaviridae family that poses a present worldwide threat to human in the absence of any licensed vaccine or antiviral treatment to control viral infection. Here, we show that compounds interfering with intracellular cholesterol transport have the capacity to inhibit CHIKV replication in human skin fibroblasts, a major viral entry site in the human host. Pretreatment of these cells with the class II cationic amphiphilic compound U18666A, or treatment with the FDA-approved antidepressant drug imipramine resulted in a near total inhibition of viral replication and production at the highest concentration used without any cytotoxic effects...
June 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28598256/integrated-immunogenicity-analysis-of-a-tetravalent-dengue-vaccine-up-to-4%C3%A2-years-after-vaccination
#15
Claire Vigne, Martin Dupuy, Aline Richetin, Bruno Guy, Nicholas Jackson, Matthew Bonaparte, Branda Hu, Melanie Saville, Danaya Chansinghakul, Fernando Noriega, Eric Plennevaux
Two large pivotal phase III studies demonstrated the efficacy of the tetravalent dengue vaccine (CYD-TDV; Dengvaxia®, Sanofi Pasteur) against all dengue serotypes. Here we present an unprecedented integrated summary of the immunogenicity of CYD-TDV to identify the parameters driving the neutralizing humoral immune response and evolution over time. We summarized the immunogenicity profiles of a three-dose schedule of CYD-TDV administered 6 months apart across ten phase II and six phase III trials undertaken in endemic and non-endemic countries...
June 9, 2017: Human Vaccines & Immunotherapeutics
https://www.readbyqxmd.com/read/28592531/use-of-a-recombinant-gamma-2-herpesvirus-vaccine-vector-against-dengue-virus-in-rhesus-monkeys
#16
Georg F Bischof, Diogo M Magnani, Michael Ricciardi, Young C Shin, Aline Domingues, Varian K Bailey, Lucas Gonzalez-Nieto, Eva G Rakasz, David I Watkins, Ronald C Desrosiers
Research on vaccine approaches that can provide long-term protection against dengue virus infection is needed. Here we describe the construction, immunogenicity, and preliminary information on protective capacity of recombinant, replication-competent rhesus monkey rhadinovirus (RRV), a persisting herpesvirus. One RRV construct expressed the non-structural protein 5 (NS5) while a second recombinant expressed a soluble variant of the E protein (E85) of dengue virus 2 (DENV2). Four rhesus macaques received a single vaccination with a mixture of both recombinant RRVs and were subsequently challenged 19 weeks later with 1 x 10(5) PFU of DENV2...
June 7, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28590795/a-recombinant-live-attenuated-tetravalent-vaccine-for-the-prevention-of-dengue
#17
Bruno Guy, Fernando Noriega, R Leon Ochiai, Maïna L'azou, Valentine Delore, Anna Skipetrova, François Verdier, Laurent Coudeville, Stephen Savarino, Nicholas Jackson
Dengue is an important and still growing public health problem associated with substantial morbidity, as well as significant social and economic impact. The present review describes the main features and development of the first dengue vaccine (CYD-TDV, Dengvaxia®), which has been licensed by several dengue-endemic countries in Asia and Latin America for use in populations above 9 years of age. Areas covered: The review focuses on the large clinical development of CYD-TDV, which includes in particular two pivotal phase III efficacy trials conducted in Asia and Latin America and supported vaccine licensure...
July 2017: Expert Review of Vaccines
https://www.readbyqxmd.com/read/28590221/evaluation-of-pyriproxyfen-dissemination-via-aedes-albopictus-from-a-point-source-larvicide-application-in-northeast-florida
#18
Aaron M Lloyd, Muhammad Farooq, Alden S Estep, Rui-De Xue, Daniel L Kline
The Asian tiger mosquito, Aedes albopictus , ranks among the most important vectors of dengue fever, Zika virus, and chikungunya virus. With no specific medications or vaccines available, vector control is the only way to combat these diseases. Autodissemination of the insect growth regulator pyriproxyfen (NyGuard®) from a point-source treatment was evaluated in field settings in northeast Florida. The objective of this study was to investigate the possibility of pyriproxyfen dissemination from a treatment site to nontreated oviposition sites via the skip oviposition behavior of Ae...
June 2017: Journal of the American Mosquito Control Association
https://www.readbyqxmd.com/read/28577343/de-novo-rna-synthesis-catalyzed-by-the-zika-virus-rna-polymerase-domain
#19
Christina Calmels, Michel Ventura, Cindy Aknin, Mathieu Métifiot, Marie-Line Andreola
Mosquito- and tick-borne pathogens including Chikungunya, Dengue, Japanese encephalitis, West Nile, Yellow fever and Zika virus, represent a new economic and public health challenge. In the absence of effective vaccines and specific therapies, only supportive regimens are administrated for most of these infections. Thus, the development of a targeted therapy is mandatory to stop the rapid progression of these pathogens and preoccupant associated burdens such as Guillain-Barre syndrome, microcephaly. For this, it is essential to develop biochemical tools to help study and target key viral enzymes involved in replication such as helicase complexes, methyl-transferases and RNA-dependent RNA polymerases...
June 2, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28562615/screening-test-for-neutralizing-antibodies-against-yellow-fever-virus-based-on-a-flavivirus-pseudotype
#20
Séverine Mercier-Delarue, Christine Durier, Nathalie Colin de Verdière, Jean-Dominique Poveda, Vincent Meiffrédy, Maria Dolores Fernandez Garcia, Stéphane Lastère, Raymond Césaire, Jean-Claude Manuggera, Jean-Michel Molina, Ali Amara, François Simon
Given the possibility of yellow fever virus reintroduction in epidemiologically receptive geographic areas, the risk of vaccine supply disruption is a serious issue. New strategies to reduce the doses of injected vaccines should be evaluated very carefully in terms of immunogenicity. The plaque reduction test for the determination of neutralizing antibodies (PRNT) is particularly time-consuming and requires the use of a confinement laboratory. We have developed a new test based on the use of a non-infectious pseudovirus (WN/YF17D)...
2017: PloS One
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