ABSTRACT
A "febre de Marburg", "febre hemorrágica de Margurg", o "Marburgvirus", o "Vírus de Marburg", o "Vírus de Marburgo" (MARV), ou ainda, a "doença do vírus Marburg" (DVM), são nomenclaturas relacionadas a mesma complexa enfermidade, que possuir elevada virulência e letalidade, sendo pertencente direta da ordem dos "Mononegavirales", da família "Filoviridae" e do gênero "Marburgvirus". 1,2,3,5,9,10,12,13 Conforme identificado junto a literatura científica, um outro termo alternativo e, diretamente relacionado ao DVM é "Marburgvirus do Lago Vitória", sendo ele possuidor de várias linhagens e, o seu gênero, não mostra reatividade antigênica do tipo cruzada, com o conhecido "Ebolavirus"
Subject(s)
Marburgvirus , Hemorrhagic Fever, Ebola , HemorrhageABSTRACT
This study was designed to discover filovirus entry inhibitors in a drug library of commercial medicines. One thousand and six hundred drugs were screened using the ZEBOV-GP/HIV model, a pseudovirus formed by an HIV-core packed with the Zaire Ebola virus glycoprotein. We identified 12 gonadal hormone drugs with inhibitory activities in ZEBOV-GP/HIV entry at final concentration of 10 μmol x L(-1). Among them, three drugs exhibited strong activities with IC50 < 1 μmol x L(-1), such as toremifene citrate (IC50: 0.19 ± 0.02 μmol x L(-1)), tamoxifen citrate (IC50: 0.32 ± 0.01 μmol x L(-1)) and clomiphene citrate (IC50: 0.53 ± 0.02 μmol x L(-1)); seven drugs had moderate activities with IC50 between 1 and 10 μmol x L(-1), such as estradiol benzoate (IC50: 1.83 ± 5.69 μmol x L(-1)), raloxifene hydrochloride (IC50: 3.48 ± 0.07 μmol x L(-1)), equilin (IC50: 4.00 ± 9.94 μmol x L(-1)), estradiol (IC50: 5.26 ± 9.92 μmol x L(-1)), quinestrol (IC50: 6.36?5.37 gmol-L1), estrone (IC50: 6.87 ± 0.03 μmol-L1) and finasteride (IC50: 9.94 ± 0.45 μmol x L(-1)); two drugs, hexestrol (IC50: 14.20 ± 0.55 μmol x L(-1)) and chlormadinone acetate (IC50: 24.60 ± 0.36 μmol x L(-1)), had weak activities against ZEBOV. Further, toremifene citrate, tamoxifen citrate, clomiphene citrate, raloxifene hydrochloride and quinestrol could block both pseudovirus type Sudan ebola virus (SEBOV-GP/HIV) and Marburg virus (MARV-GP/HIV) entries.
Subject(s)
Humans , Antiviral Agents , Pharmacology , Drug Evaluation, Preclinical , Ebolavirus , Physiology , Hemorrhagic Fever, Ebola , Marburgvirus , Physiology , Selective Estrogen Receptor Modulators , Pharmacology , Virus InternalizationABSTRACT
Ebola virus (EBOV) and Marburg virus (MARV) belong to the family Filoviridae. Filoviruses cause severe filovirus hemorrhagic fever (FHF) in humans, with high case fatality rates, and represent potential agents for bioterrorism and biological weapons. It is necessary to keep surveillance of filoviruses, even though there is no report of their isolation and patients in China so far. To characterize MARV morphology, the Lake Victoria marburgvirus--Leiden was stained negatively and observed under a transmission electron microscope which is one of important detection methods for filoviruses in emergencies and bioterrorism. MARV showed pleomorphism, with filamentous, rod-shaped, cobra-like, spherical, and branch-shaped particles of uniform diameter but different lengths. Pleomorphism of negatively stained MARV is summarized in this article, so as to provide useful information for possible electron microscopic identification of filoviruses in China.
Subject(s)
Animals , Humans , Marburg Virus Disease , Virology , Marburgvirus , Microscopy, Electron, Transmission , VirionABSTRACT
<p><b>OBJECTIVE</b>Marburg virus and Ebola virus are acute infections with high case fatality rates. A rapid, sensitive detection method was established to detect Marburg virus and Ebola virus by multiplex real-time fluorescence quantitative PCR.</p><p><b>METHODS</b>Designing primers and Taqman probes from highly conserved sequences of Marburg virus and Ebola virus through whole genome sequences alignment, Taqman probes labeled by FAM and Texas Red, the sensitivity of the multiplex real-time quantitative PCR assay was optimized by evaluating the different concentrations of primers and Probes.</p><p><b>RESULTS</b>We have developed a real-time PCR method with the sensitivity of 30.5 copies/microl for Marburg virus positive plasmid and 28.6 copies/microl for Ebola virus positive plasmids, Japanese encephalitis virus, Yellow fever virus, Dengue virus were using to examine the specificity.</p><p><b>CONCLUSIONS</b>The Multiplex real-time PCR assays provide a sensitive, reliable and efficient method to detect Marburg virus and Ebola virus simultaneously.</p>
Subject(s)
Humans , Ebolavirus , Genetics , Filoviridae Infections , Diagnosis , Virology , Hemorrhagic Fever, Ebola , Diagnosis , Virology , Marburgvirus , Genetics , Multiplex Polymerase Chain Reaction , Methods , Real-Time Polymerase Chain Reaction , MethodsABSTRACT
Las fiebres hemorrágicas virales (FHV) han sido la causa de alias tasas de morbilidad y mortalidad alrededor del mundo. El termino fiebre hemorrágica viral (FHV) describe un síndrome caracterizado por la presencia de fiebre y hemorragias, causado por virus pertenecientes a distintas familias (Filoviridae, Arenaviridae, Bunyaviridae y Flaviviridae), y transmitidos al hombre por artrópodos (mosquitos y garrapatas), reservorios vertebrados, e incluso por transmisión directa. Los virus hemorrágicos causan una infección aguda con una sintomatología inespecífica, que se vuelve mas característica en las fases tardías de la enfermedad cuando se produce el fallo orgánico que puede conducir a la muerte. Dos grupos importantes de virus de ARN pertenecientes a la familia arenaviridae y Bunyaviridae (género Hantavirus) son la causa principal de las fiebres hemorrágicas transmitidas por roedores. El genero Hantavirus identificado como agente etiológico de la Fiebre Hemorrágica con Síndrome Renal en Asia y Europa, y del Síndrome Cardiopulmonar por Hantavirus en Las Américas, lo constituye un grupo de virus transmitidos por roedores. Los arenavirus son patógenos transmitidos por roedores identificados como una causa importante de fiebres hemorrágicas en África y Sur América, se agrupan en dos grandes complejos: Arenavirus del Viejo Mundo o complejo Linfocoriomeningitis, y Arenavirus del Nuevo Mundo o complejo Tacaribe, que comprende 3 grupos: A, B y C. Actualmente, el dengue causa más enfermedades y muertes que cualquier otro Arbovirus en seres humanos. Cada ano, un estimado de 100 millones de casos de fiebre por dengue y algunos cientos de miles de fiebre hemorrágica por dengue ocurren en todo el mundo. Hasta la fecha, cuatro serotipos virales de dengue han sido descritos: el DEN-1, DEN-2, DEN-3 y DEN-4. El virus de la fiebre amarilla es el prototipo de la familia Fiaviviridae, y fue la primera fiebre hemorrágica descrita. Es endémica y epidémica en 33 países del África Su.