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Zika and microcephaly

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https://www.readbyqxmd.com/read/27919709/evaluation-of-anti-zika-virus-activities-of-broad-spectrum-antivirals-and-nih-clinical-collection-compounds-using-a-cell-based-high-throughput-screen-assay
#1
Robert S Adcock, Yong-Kyu Chu, Jennifer E Golden, Dong-Hoon Chung
Recent studies have clearly underscored the association between Zika virus (ZIKV) and severe neurological diseases such as microcephaly and Guillain-Barre syndrome. Given the historical complacency surrounding this virus, however, no significant antiviral screenings have been performed to specifically target ZIKV. As a result, there is an urgent need for a validated screening method and strategy that is focused on highlighting potential anti-ZIKV inhibitors that can be further advanced via rigorous validation and optimization...
December 2, 2016: Antiviral Research
https://www.readbyqxmd.com/read/27919154/-many-doubts-about-the-relationship-between-cases-of-microcephaly-and-zika-virus-in-brazil
#2
Roberto Ronchetti, Pietro Massimiliano Bianco
During the last few years, Zika virus rapidly spread across Central and South America and in the last months has spread also across Southern States of USA. As the epidemic began in Brazil, an increase of microcephaly cases was registered, causing concern and inducing the World Health Organization to raise an alarm. Certainly, the Zika virus, as many other viruses, has the capacity to induce severe cerebral lesions in foetuses of women infected during the first months of pregnancy. Moreover, more than 80% of cases of craniostenosys that verisimilarly took place in Brazil from September 2015 up to now were registered in few states of North- Eastern Brazil, where peaks of this malformation were registered several years before the appearance of Zika virus...
November 2016: Epidemiologia e Prevenzione
https://www.readbyqxmd.com/read/27916837/chloroquine-an-endocytosis-blocking-agent-inhibits-zika-virus-infection-in-different-cell-models
#3
Rodrigo Delvecchio, Luiza M Higa, Paula Pezzuto, Ana Luiza Valadão, Patrícia P Garcez, Fábio L Monteiro, Erick C Loiola, André A Dias, Fábio J M Silva, Matthew T Aliota, Elizabeth A Caine, Jorge E Osorio, Maria Bellio, David H O'Connor, Stevens Rehen, Renato Santana de Aguiar, Andrea Savarino, Loraine Campanati, Amilcar Tanuri
Zika virus (ZIKV) infection in utero might lead to microcephaly and other congenital defects. Since no specific therapy is available thus far, there is an urgent need for the discovery of agents capable of inhibiting its viral replication and deleterious effects. Chloroquine is widely used as an antimalarial drug, anti-inflammatory agent, and it also shows antiviral activity against several viruses. Here we show that chloroquine exhibits antiviral activity against ZIKV in Vero cells, human brain microvascular endothelial cells, human neural stem cells, and mouse neurospheres...
November 29, 2016: Viruses
https://www.readbyqxmd.com/read/27916410/meeting-report-who-consultation-on-considerations-for-regulatory-expectations-of-zika-virus-vaccines-for-use-during-an-emergency
#4
K S Vannice, B K Giersing, D C Kaslow, E Griffiths, H Meyer, A Barrett, A P Durbin, D Wood, J Hombach
On 1 February 2016, in the context of the ongoing Zika virus epidemic, the WHO declared that the recently reported clusters of microcephaly and other neurological disorders constituted a Public Health Emergency of International Concern (PHEIC). In response, WHO in collaboration with UNICEF and a working group of independent subject matter experts developed a Zika virus vaccine Target Product Profile (TPP) for use in an emergency, or in a future outbreak scenario. The drafting process of the Zika virus vaccine TPP included the opportunity for public comment, as well as consultation with epidemiologists, flavivirus vaccine subject matter experts, vaccine developers and global regulators to consider the regulatory expectations and potential emergency use pathways for a vaccine with the characteristics described in the TPP...
December 1, 2016: Vaccine
https://www.readbyqxmd.com/read/27915293/molecular-mechanism-of-divalent-metal-induced-activation-of-ns3-helicase-and-insights-into-zika-virus-inhibitor-design
#5
Xiaocong Cao, Yajuan Li, Xiangyu Jin, Yuelong Li, Feng Guo, Tengchuan Jin
Zika virus has attracted increasing attention because of its potential for causing human neural disorders, including microcephaly in infants and Guillain-Barré syndrome. Its NS3 helicase domain plays critical roles in NTP-dependent RNA unwinding and translocation during viral replication. Our structural analysis revealed a pre-activation state of NS3 helicase in complex with GTPγS, in which the triphosphate adopts a compact conformation in the absence of any divalent metal ions. In contrast, in the presence of a divalent cation, GTPγS adopts an extended conformation, and the Walker A motif undergoes substantial conformational changes...
December 1, 2016: Nucleic Acids Research
https://www.readbyqxmd.com/read/27912091/genetic-ablation-of-axl-does-not-protect-human-neural-progenitor-cells-and-cerebral-organoids-from-zika-virus-infection
#6
Michael F Wells, Max R Salick, Ole Wiskow, Daniel J Ho, Kathleen A Worringer, Robert J Ihry, Sravya Kommineni, Bilada Bilican, Joseph R Klim, Ellen J Hill, Liam T Kane, Chaoyang Ye, Ajamete Kaykas, Kevin Eggan
Zika virus (ZIKV) can cross the placental barrier, resulting in infection of the fetal brain and neurological defects including microcephaly. The cellular tropism of ZIKV and the identity of attachment factors used by the virus to gain access to key cell types involved in pathogenesis are under intense investigation. Initial studies suggested that ZIKV preferentially targets neural progenitor cells (NPCs), providing an explanation for the developmental phenotypes observed in some pregnancies. The AXL protein has been nominated as a key attachment factor for ZIKV in several cell types including NPCs...
December 1, 2016: Cell Stem Cell
https://www.readbyqxmd.com/read/27911897/heterologous-protection-against-asian-zika-virus-challenge-in-rhesus-macaques
#7
Matthew T Aliota, Dawn M Dudley, Christina M Newman, Emma L Mohr, Dane D Gellerup, Meghan E Breitbach, Connor R Buechler, Mustafa N Rasheed, Mariel S Mohns, Andrea M Weiler, Gabrielle L Barry, Kim L Weisgrau, Josh A Eudailey, Eva G Rakasz, Logan J Vosler, Jennifer Post, Saverio Capuano, Thaddeus G Golos, Sallie R Permar, Jorge E Osorio, Thomas C Friedrich, Shelby L O'Connor, David H O'Connor
BACKGROUND: Zika virus (ZIKV; Flaviviridae, Flavivirus) was declared a public health emergency of international concern by the World Health Organization (WHO) in February 2016, because of the evidence linking infection with ZIKV to neurological complications, such as Guillain-Barre Syndrome in adults and congenital birth defects including microcephaly in the developing fetus. Because development of a ZIKV vaccine is a top research priority and because the genetic and antigenic variability of many RNA viruses limits the effectiveness of vaccines, assessing whether immunity elicited against one ZIKV strain is sufficient to confer broad protection against all ZIKV strains is critical...
December 2016: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/27911847/zika-virus-cell-tropism-in-the-developing-human-brain-and-inhibition-by-azithromycin
#8
Hanna Retallack, Elizabeth Di Lullo, Carolina Arias, Kristeene A Knopp, Matthew T Laurie, Carmen Sandoval-Espinosa, Walter R Mancia Leon, Robert Krencik, Erik M Ullian, Julien Spatazza, Alex A Pollen, Caleigh Mandel-Brehm, Tomasz J Nowakowski, Arnold R Kriegstein, Joseph L DeRisi
The rapid spread of Zika virus (ZIKV) and its association with abnormal brain development constitute a global health emergency. Congenital ZIKV infection produces a range of mild to severe pathologies, including microcephaly. To understand the pathophysiology of ZIKV infection, we used models of the developing brain that faithfully recapitulate the tissue architecture in early to midgestation. We identify the brain cell populations that are most susceptible to ZIKV infection in primary human tissue, provide evidence for a mechanism of viral entry, and show that a commonly used antibiotic protects cultured brain cells by reducing viral proliferation...
November 29, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27909576/zika-antiviral-chemotherapy-identification-of-drugs-and-promising-starting-points-for-drug-discovery-from-an-fda-approved-library
#9
Bruno S Pascoalino, Gilles Courtemanche, Marli T Cordeiro, Laura H V G Gil, Lucio Freitas-Junior
Background The recent epidemics of Zika virus (ZIKV) implicated it as the cause of serious and potentially lethal congenital conditions such microcephaly and other central nervous system defects, as well as the development of the Guillain-Barré syndrome in otherwise healthy patients. Recent findings showed that anti-Dengue antibodies are capable of amplifying ZIKV infection by a mechanism similar to antibody-dependent enhancement, increasing the severity of the disease. This scenario becomes potentially catastrophic when the global burden of Dengue and the advent of the newly approved anti-Dengue vaccines in the near future are taken into account...
2016: F1000Research
https://www.readbyqxmd.com/read/27906905/description-of-13-infants-born-during-october-2015-january-2016-with-congenital-zika-virus-infection-without-microcephaly-at-birth-brazil
#10
Vanessa van der Linden, André Pessoa, William Dobyns, A James Barkovich, Hélio van der Linden Júnior, Epitacio Leite Rolim Filho, Erlane Marques Ribeiro, Mariana de Carvalho Leal, Pablo Picasso de Araújo Coimbra, Maria de Fátima Viana Vasco Aragão, Islane Verçosa, Camila Ventura, Regina Coeli Ramos, Danielle Di Cavalcanti Sousa Cruz, Marli Tenório Cordeiro, Vivian Maria Ribeiro Mota, Mary Dott, Christina Hillard, Cynthia A Moore
Congenital Zika virus infection can cause microcephaly and severe brain abnormalities (1). Congenital Zika syndrome comprises a spectrum of clinical features (2); however, as is the case with most newly recognized teratogens, the earliest documented clinical presentation is expected to be the most severe. Initial descriptions of the effects of in utero Zika virus infection centered prominently on the finding of congenital microcephaly (3). To assess the possibility of clinical presentations that do not include congenital microcephaly, a retrospective assessment of 13 infants from the Brazilian states of Pernambuco and Ceará with normal head size at birth and laboratory evidence of congenital Zika virus infection was conducted...
December 2, 2016: MMWR. Morbidity and Mortality Weekly Report
https://www.readbyqxmd.com/read/27902933/the-fda-approved-drug-sofosbuvir-inhibits-zika-virus-infection
#11
Kristen M Bullard-Feibelman, Jennifer Govero, Zhe Zhu, Vanessa Salazar, Milena Veselinovic, Michael S Diamond, Brian J Geiss
The rapidly expanding Zika virus (ZIKV) epidemic has affected thousands of individuals with severe cases causing Guillain-Barré syndrome, congenital malformations, and microcephaly. Currently, there is no available vaccine or therapy to prevent or treat ZIKV infection. We evaluated whether sofosbuvir, an FDA-approved nucleotide polymerase inhibitor for the distantly related hepatitis C virus, could have antiviral activity against ZIKV infection. Cell culture studies established that sofosbuvir efficiently inhibits replication and infection of several ZIKV strains in multiple human tumor cell lines and isolated human fetal-derived neuronal stem cells...
November 27, 2016: Antiviral Research
https://www.readbyqxmd.com/read/27902502/zika-virus-and-patient-blood-management
#12
Lawrence T Goodnough, Marisa B Marques
Sporadic Zika virus infections had only occurred in Africa and Asia until an outbreak in Micronesia (Oceania) in 2007. In 2013 to 2014, several outer Pacific Islands reported local outbreaks. Soon thereafter, the virus was likely introduced in Brazil from competing athletes from French Polynesia and other countries that participated in a competition there. Transmission is thought to have occurred through mosquito bites and spread to the immunologically naive population. Being also a flavivirus, the Zika virus is transmitted by the Aedes mosquito that is endemic in South and Central America that is also the vector of West Nile virus, dengue, and chikungunya...
November 29, 2016: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/27901259/neurological-manifestations-of-chikungunya-and-zika-infections
#13
Talys J Pinheiro, Luis F Guimarães, Marcus Tulius T Silva, Cristiane N Soares
The epidemics of Chikungunya virus (CHIKV) and Zika virus (ZIKV) infections have been considered the most important epidemiological occurrences in the Americas. The clinical picture of CHIKV infection is characterized by high fever, exanthema, myalgia, headaches, and arthralgia. Besides the typical clinical picture of CHIKV, atypical manifestations of neurological complications have been reported: meningo-encephalitis, meningoencephalo-myeloradiculitis, myeloradiculitis, myelitis, myeloneuropathy, Guillain-Barré syndrome and others...
November 2016: Arquivos de Neuro-psiquiatria
https://www.readbyqxmd.com/read/27899230/experimental-zika-virus-infection-induces-spinal-cord-injury-and-encephalitis-in-newborn-swiss-mice
#14
Natália C C A Fernandes, Juliana S Nogueira, Rodrigo A Réssio, Cinthya S Cirqueira, Lidia M Kimura, Karolina R Fernandes, Mariana S Cunha, Renato P Souza, Juliana M Guerra
A widespread epidemic of Zika virus (ZIKV) infection was reported in 2015 in South and Central America, with neurological symptons including meningoencephalitis and Guillain-Barré syndrome in adults, besides an apparent increased incidence of microcephaly in infants born to infected mothers. It is becoming a necessity to have a trustworthy animal model to better understand ZIKV infection. In this study we used newborn white Swiss mice as a model to investigate the ZIKV strain recently isolated in Brazil. ZIKV was inoculated via intracerebral and subcutaneous routes and analysed through gross histopathology and immunohistochemistry...
November 26, 2016: Experimental and Toxicologic Pathology: Official Journal of the Gesellschaft Für Toxikologische Pathologie
https://www.readbyqxmd.com/read/27893080/travel-associated-zika-virus-disease-acquired-in-the-americas-through-february-2016-a-geosentinel-analysis
#15
Davidson H Hamer, Kira A Barbre, Lin H Chen, Martin P Grobusch, Patricia Schlagenhauf, Abraham Goorhuis, Perry J J van Genderen, Israel Molina, Hilmir Asgeirsson, Phyllis E Kozarsky, Eric Caumes, Stefan H Hagmann, Frank P Mockenhaupt, Gilles Eperon, Elizabeth D Barnett, Emmanuel Bottieau, Andrea K Boggild, Philippe Gautret, Noreen A Hynes, Susan Kuhn, R Ryan Lash, Karin Leder, Michael Libman, Denis J M Malvy, Cecilia Perret, Camilla Rothe, Eli Schwartz, Annelies Wilder-Smith, Martin S Cetron, Douglas H Esposito
Background: Zika virus has spread rapidly in the Americas and has been imported into many nonendemic countries by travelers. Objective: To describe clinical manifestations and epidemiology of Zika virus disease in travelers exposed in the Americas. Design: Descriptive, using GeoSentinel records. Setting: 63 travel and tropical medicine clinics in 30 countries. Patients: Ill returned travelers with a confirmed, probable, or clinically suspected diagnosis of Zika virus disease seen between January 2013 and 29 February 2016...
November 22, 2016: Annals of Internal Medicine
https://www.readbyqxmd.com/read/27892990/zika-virus-what-the-otolaryngologist-should-know-a-review
#16
Demetri Arnaoutakis, Tapan Padhya
Importance: Initially discovered in 1947, Zika virus infection received little notoriety as a tropical disease until 2015 when an outbreak of microcephaly cases was reported in Brazil. Zika is a single-stranded RNA arbovirus of the Flaviviridae family. The primary source of infection in humans stems from Aedes aegypti mosquito bites but can also occur through sexual, blood, and perinatal transmission. With expectations that 3 to 4 million people across the Americas will be infected over the next year, the World Health Organization has declared this event a Public Health Emergency of International Concern...
November 17, 2016: JAMA Otolaryngology—Head & Neck Surgery
https://www.readbyqxmd.com/read/27891786/a-quality-assessment-of-reporting-sources-for-microcephaly-in-utah-2003-to-2013
#17
Amy Steele, Jane Johnson, Amy Nance, Robert Satterfield, C J Alverson, Cara Mai
BACKGROUND: Obtaining accurate microcephaly prevalence is important given the recent association between microcephaly and Zika virus. Assessing the quality of data sources can guide surveillance programs as they focus their data collection efforts. The Utah Birth Defect Network (UBDN) has monitored microcephaly by data sources since 2003. The objective of this study was to examine the impact of reporting sources for microcephaly surveillance. METHODS: All reported cases of microcephaly among Utah mothers from 2003 to 2013 were clinically reviewed and confirmed...
November 2016: Birth Defects Research. Part A, Clinical and Molecular Teratology
https://www.readbyqxmd.com/read/27891785/editorial-brain-malformation-surveillance-in-the-zika-era
#18
EDITORIAL
Edwin Trevathan
The current surveillance systems for congenital microcephaly are necessary to monitor the impact of Zika virus (ZIKV) on the developing human brain, as well as the ZIKV prevention efforts. However, these congenital microcephaly surveillance systems are insufficient. Abnormalities of neuronal differentiation, development and migration may occur among infants with normal head circumference who have intrauterine exposure to ZIKV. Therefore, surveillance for congenital microcephaly does not ascertain many of the infants seriously impacted by congenital ZIKV infection...
November 2016: Birth Defects Research. Part A, Clinical and Molecular Teratology
https://www.readbyqxmd.com/read/27891783/population-based-microcephaly-surveillance-in-the-united-states-2009-to-2013-an-analysis-of-potential-sources-of-variation
#19
Janet D Cragan, Jennifer L Isenburg, Samantha E Parker, C J Alverson, Robert E Meyer, Erin B Stallings, Russell S Kirby, Philip J Lupo, Jennifer S Liu, Amanda Seagroves, Mary K Ethen, Sook Ja Cho, MaryAnn Evans, Rebecca F Liberman, Jane Fornoff, Marilyn L Browne, Rachel E Rutkowski, Amy E Nance, Marlene Anderka, Deborah J Fox, Amy Steele, Glenn Copeland, Paul A Romitti, Cara T Mai
BACKGROUND: Congenital microcephaly has been linked to maternal Zika virus infection. However, ascertaining infants diagnosed with microcephaly can be challenging. METHODS: Thirty birth defects surveillance programs provided data on infants diagnosed with microcephaly born 2009 to 2013. The pooled prevalence of microcephaly per 10,000 live births was estimated overall and by maternal/infant characteristics. Variation in prevalence was examined across case finding methods...
November 2016: Birth Defects Research. Part A, Clinical and Molecular Teratology
https://www.readbyqxmd.com/read/27885789/zika-virus-associated-microcephaly-micrencephaly-fetal-brain-imaging-in-comparison-with-neuropathology
#20
T Vipotnik Vesnaver, N Tul, S Mehrabi, F Parissone, P Štrafela, J Mlakar, J Pižem, M Korva, T Avšič Zupanc, M Popović
No abstract text is available yet for this article.
November 24, 2016: BJOG: An International Journal of Obstetrics and Gynaecology
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