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Infectious Disease: Dengue Fever

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Total 65 results found since Jan 2013.

Dengue virus induces Interferon- β by activating RNA sensing pathways in megakaryocytes
Immunol Lett. 2021 Jun 7:S0165-2478(21)00095-X. doi: 10.1016/j.imlet.2021.06.001. Online ahead of print.ABSTRACTActivation of innate receptors in megakaryocytes (MKs) may affect the ability to produce functional platelets. Low platelet count is one of the clinical manifestations of dengue virus (DENV) infection. In MKs, the effect of innate receptors during DENV-infection is not well studied. Here we used MEG-01 cells to investigate DENV serotype 2 induced innate receptors in these cells. DENV RNA was estimated by qRT-PCR in the culture supernatant. The expression of innate receptors was determined by western blot and qPCR...
Source: Immunology Letters - June 10, 2021 Category: Allergy & Immunology Authors: Ravi Prakash Arya Anismrita Lahon Ashok Kumar Patel Source Type: research

Dengue virus induces interferon- β by activating RNA sensing pathways in megakaryocytes
Immunol Lett. 2021 Jun 7;236:31-36. doi: 10.1016/j.imlet.2021.06.001. Online ahead of print.ABSTRACTActivation of innate receptors in megakaryocytes (MKs) may affect the ability to produce functional platelets. Low platelet count is one of the clinical manifestations of dengue virus (DENV) infection. In MKs, the effect of innate receptors during DENV-infection is not well studied. Here we used MEG-01 cells to investigate DENV serotype 2 induced innate receptors in these cells. DENV RNA was estimated by qRT-PCR in the culture supernatant. The expression of innate receptors was determined by western blot and qPCR. DENV infec...
Source: Immunology Letters - June 10, 2021 Category: Allergy & Immunology Authors: Ravi Prakash Arya Anismrita Lahon Ashok Kumar Patel Source Type: research

Viruses, Vol. 13, Pages 1066: An Aedes Aegypti-Derived Ago2 Knockout Cell Line to Investigate Arbovirus Infections
l Esther Schnettler Mosquitoes are known as important vectors of many arthropod-borne (arbo)viruses causing disease in humans. These include dengue (DENV) and Zika (ZIKV) viruses. The exogenous small interfering (si)RNA (exo-siRNA) pathway is believed to be the main antiviral defense in arthropods, including mosquitoes. During infection, double-stranded RNAs that form during viral replication and infection are cleaved by the enzyme Dicer 2 (Dcr2) into virus-specific 21 nt vsiRNAs, which are subsequently loaded into Argonaute 2 (Ago2). Ago2 then targets and subsequently cleaves complementary RNA sequences, resulting i...
Source: Viruses - June 3, 2021 Category: Virology Authors: Christina Scherer Jack Knowles Vattipally B. Sreenu Anthony C. Fredericks Janina Fuss Kevin Maringer Ana Fernandez-Sesma Andres Merits Margus Varjak Alain Kohl Esther Schnettler Tags: Article Source Type: research

USP18 Mediates Interferon Resistance of Dengue Virus Infection
Previous studies demonstrated that dengue virus (DENV) infection developed resistance to type-I interferons (IFNα/β). The underlying mechanism remains unclear. USP18 is a negative regulator of IFNα/β signaling, and its expression level is significantly increased following DENV infection in cell lines and patients’ blood. Our previous study revealed that increased USP18 expression contributed to the IFN-α resistance of Hepatitis C Virus (HCV). However, the role of USP18 in DENV replication and resistance to IFN-α is elusive. In this current study, we aimed to explore the role of USP18 in DENV-2 replication and resis...
Source: Frontiers in Microbiology - April 30, 2021 Category: Microbiology Source Type: research

Argonaute-CLIP delineates versatile, functional RNAi networks in Aedes aegypti, a major vector of human viruses
Cell Host Microbe. 2021 Mar 29:S1931-3128(21)00132-3. doi: 10.1016/j.chom.2021.03.004. Online ahead of print.ABSTRACTArgonaute (AGO) proteins bind small RNAs to silence complementary RNA transcripts, and they are central to RNA interference (RNAi). RNAi is critical for regulation of gene expression and antiviral defense in Aedes aegypti mosquitoes, which transmit Zika, chikungunya, dengue, and yellow fever viruses. In mosquitoes, AGO1 mediates miRNA interactions, while AGO2 mediates siRNA interactions. We applied AGO-crosslinking immunoprecipitation (AGO-CLIP) for both AGO1 and AGO2, and we developed a universal software p...
Source: Cell Host and Microbe - April 1, 2021 Category: Microbiology Authors: Kathryn Rozen-Gagnon Meigang Gu Joseph M Luna Ji-Dung Luo Soon Yi Sasha Novack Eliana Jacobson Wei Wang Matthew R Paul Troels K H Scheel Thomas Carroll Charles M Rice Source Type: research

The E3 Ubiquitin Ligase SIAH1 Targets MyD88 for Proteasomal Degradation During Dengue Virus Infection
The dengue virus presents a serious threat to human health globally and can cause severe, even life-threatening, illness. Dengue virus (DENV) is endemic on all continents except Antarctica, and it is estimated that more than 100 million people are infected each year. Herein, we further mine the data from a previously described screen for microRNAs (miRNAs) that block flavivirus replication. We use miR-424, a member of the miR-15/16 family, as a tool to further dissect the role of host cell proteins during DENV infection. We observed that miR-424 suppresses expression of the E3 ubiquitin ligase SIAH1, which is normally indu...
Source: Frontiers in Microbiology - February 13, 2020 Category: Microbiology Source Type: research

Host factor prioritization for pan-viral genetic perturbation screens using random intercept models and network propagation
by Simon Dirmeier, Christopher D ächert, Martijn van Hemert, Ali Tas, Natacha S. Ogando, Frank van Kuppeveld, Ralf Bartenschlager, Lars Kaderali, Marco Binder, Niko Beerenwinkel Genetic perturbation screens using RNA interference (RNAi) have been conducted successfully to identify host factors that are essential for the life cycle of bacteria or viruses. So far, most published studies identified host factors primarily for single pathogens. Furthermore, often only a small subset of genes, e.g., genes encoding kinases, have been targeted. Identification of host factors on a pan-pathogen level, i.e., genes that are crucial ...
Source: PLoS Computational Biology - February 9, 2020 Category: Biology Authors: Simon Dirmeier Source Type: research

Viruses, Vol. 11, Pages 540: Assessing the Potential Interactions between Cellular miRNA and Arboviral Genomic RNA in the Yellow Fever Mosquito, Aedes aegypti
Failloux Although the role of exogenous small interfering RNA (siRNA) and P-element induced wimpy testis (PIWI)-interacting RNA (piRNA) pathways in mosquito antiviral immunity is increasingly better understood, there is still little knowledge regarding the role of mosquito cellular microRNA (miRNA). Identifying direct interactions between the mosquito miRNAs and the RNA genome of arboviruses and choosing the relevant miRNA candidates to explore resulting antiviral mechanisms are critical. Here, we carried out genomic analyses to identify Aedes aegypti miRNAs that potentially interact with various lineages and genotyp...
Source: Viruses - June 9, 2019 Category: Virology Authors: Yen Chen Sreenu Kohl Failloux Tags: Article Source Type: research

Induction of RNA interference to block Zika virus replication and transmission in the mosquito Aedes aegypti.
This study lays critical groundwork for pursuing ZIKV transmission-blocking strategies that exploit the Ae. aegypti exo-siRNA response for arbovirus suppression in natural populations. PMID: 31103782 [PubMed - as supplied by publisher]
Source: Insect Biochemistry and Molecular Biology - May 15, 2019 Category: Biochemistry Authors: Magalhaes T, Bergren NA, Bennett SL, Borland EM, Hartman DA, Lymperopoulos K, Sayre R, Borlee BR, Campbell CL, Foy BD, Olson KE, Blair CD, Black W, Kading RC Tags: Insect Biochem Mol Biol Source Type: research

High-Throughput Characterization of Viral and Cellular Protein Expression Patterns During JC Polyomavirus Infection
Discussion The study of viral infections in vitro has provided innumerable advances to the field of virology. However, the lack of rapid and efficient screening tools has hindered research progress for some viruses, like JCPyV (Houff et al., 1983; Zu Rhein, 1983; Assetta and Atwood, 2017). To overcome this challenge, the development of high-throughput analyses is needed to help aid in the production of large data sets and generation of multiple lines of inquiry. Current methodologies for analyzing JCPyV infectivity predominantly rely on manual quantitation of infection by indirect immunodetection of viral proteins by epif...
Source: Frontiers in Microbiology - April 16, 2019 Category: Microbiology Source Type: research

IFIT5 Participates in the Antiviral Mechanisms of Rainbow Trout Red Blood Cells
We described a new defense mechanism based on IFIT5 antiviral activity in nucleated RBCs that appeared to contribute to halting the VHSV infection. This finding sheds light into novel antiviral therapeutics to mitigate the economic losses and social impact caused by viral infections in the aquaculture industry. This work broadens the knowledge of fish nucleated RBCs functions and their role in the immune response to viral infections. Ethics Statement Experimental protocols and methods relating to experimental animals were reviewed and approved by the Animal Welfare Body and the Research Ethics Committee at the University...
Source: Frontiers in Immunology - April 15, 2019 Category: Allergy & Immunology Source Type: research

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