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Apoptosis and dengue

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https://www.readbyqxmd.com/read/29145490/rnai-screen-reveals-a-role-of-sphk2-in-dengue-virus-mediated-apoptosis-in-hepatic-cell-lines
#1
Atthapan Morchang, Regina Ching Hua Lee, Pa-Thai Yenchitsomanus, Gopinathan Pillai Sreekanth, Sansanee Noisakran, Justin Jang Hann Chu, Thawornchai Limjindaporn
Hepatic dysfunction is a feature of dengue virus (DENV) infection. Hepatic biopsy specimens obtained from fatal cases of DENV infection show apoptosis, which relates to the pathogenesis of DENV infection. However, how DENV induced liver injury is not fully understood. In this study, we aim to identify the factors that influence cell death by employing an apoptosis-related siRNA library screening. Our results show the effect of 558 gene silencing on caspase 3-mediated apoptosis in DENV-infected Huh7 cells. The majority of genes that contributed to apoptosis were the apoptosis-related kinase enzymes...
2017: PloS One
https://www.readbyqxmd.com/read/29016307/the-differential-expression-and-possible-function-of-long-noncoding-rnas-in-liver-cells-infected-by-dengue-virus
#2
Xiao-Jun Wang, Shi-Chen Jiang, Hai-Xia Wei, Sheng-Qun Deng, Cheng He, Hong-Juan Peng
The function of long noncoding RNAs (lncRNAs) in liver injury resulted by dengue virus (DENV) infection have not yet been explored. The differential expression profiles of lncRNAs coupled with mRNAs in L-02 liver cells in the DENV1 infected, DENV2 infected, and untreated control group were analyzed after high throughput RNA sequencing, the significantly upregulated and downregulated lncRNAs or mRNAs comparing with the control group were identified with a cutoff value at log2 (ratio) ≥ 1.5 and log2 (ratio) ≤ -1...
October 2, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28930151/perk-signal-modulated-protein-translation-promotes-the-survivability-of-dengue-2-virus-infected-mosquito-cells-and-extends-viral-replication
#3
Jiun-Nan Hou, Tien-Huang Chen, Yi-Hsuan Chiang, Jing-Yun Peng, Tsong-Han Yang, Chih-Chieh Cheng, Eny Sofiyatun, Cheng-Hsun Chiu, Chuan Chiang-Ni, Wei-June Chen
Survival of mosquitoes from dengue virus (DENV) infection is a prerequisite of viral transmission to the host. This study aimed to see how mosquito cells can survive the infection during prosperous replication of the virus. In C6/36 cells, global protein translation was shut down after infection by DENV type 2 (DENV2). However, it returned to a normal level when infected cells were treated with an inhibitor of the protein kinase RNA (PKR)-like ER kinase (PERK) signaling pathway. Based on a 7-Methylguanosine 5'-triphosphate (m7GTP) pull-down assay, the eukaryotic translation initiation factor 4F (eIF4F) complex was also identified in DENV2-infected cells...
September 20, 2017: Viruses
https://www.readbyqxmd.com/read/28894401/soluble-fas-ligand-as-a-potential-marker-of-severity-of-dengue-infection
#4
Nurfadly Zain, Suhartono Taat Putra, Umar Zein, Herman Hariman
BACKGROUND: The apoptosis of microvascular endothelial cells causes plasma leakage in dengue haemorrhagic fever patients. The soluble Fas ligand is a protein with molecular weight of 40 kDa that acts as a mediator of apoptosis. This study aimed to prove whether soluble Fas ligand can be used as a potential marker to predict the severity of dengue infection by comparing the soluble Fas ligand levels in dengue fever (DF) and dengue haemorrhagic fever (DHF) patients early in the course of illness...
March 2017: Malaysian Journal of Medical Sciences: MJMS
https://www.readbyqxmd.com/read/28855396/increased-adaptive-immune-responses-and-proper-feedback-regulation-protect-against-clinical-dengue
#5
Etienne Simon-Lorière, Veasna Duong, Ahmed Tawfik, Sivlin Ung, Sowath Ly, Isabelle Casadémont, Matthieu Prot, Noémie Courtejoie, Kevin Bleakley, Philippe Buchy, Arnaud Tarantola, Philippe Dussart, Tineke Cantaert, Anavaj Sakuntabhai
Clinical symptoms of dengue virus (DENV) infection, the most prevalent arthropod-borne viral disease, range from classical mild dengue fever to severe, life-threatening dengue shock syndrome. However, most DENV infections cause few or no symptoms. Asymptomatic DENV-infected patients provide a unique opportunity to decipher the host immune responses leading to virus elimination without negative impact on an individual's health. We used an integrated approach of transcriptional profiling and immunological analysis to compare a Cambodian population of strictly asymptomatic viremic individuals with clinical dengue patients...
August 30, 2017: Science Translational Medicine
https://www.readbyqxmd.com/read/28846635/regulation-of-apoptosis-during-flavivirus-infection
#6
REVIEW
Toru Okamoto, Tatsuya Suzuki, Shinji Kusakabe, Makoto Tokunaga, Junki Hirano, Yuka Miyata, Yoshiharu Matsuura
Apoptosis is a type of programmed cell death that regulates cellular homeostasis by removing damaged or unnecessary cells. Its importance in host defenses is highlighted by the observation that many viruses evade, obstruct, or subvert apoptosis, thereby blunting the host immune response. Infection with Flaviviruses such as Japanese encephalitis virus (JEV), Dengue virus (DENV) and West Nile virus (WNV) has been shown to activate several signaling pathways such as endoplasmic reticulum (ER)-stress and AKT/PI3K pathway, resulting in activation or suppression of apoptosis in virus-infected cells...
August 28, 2017: Viruses
https://www.readbyqxmd.com/read/28690024/the-p53-gene-with-emphasis-on-its-paralogues-in-mosquitoes
#7
REVIEW
Tien-Huang Chen, Yi-Jun Wu, Jiun-Nan Hou, Cheng-Hsun Chiu, Wei-June Chen
The p53 gene is highly important in human cancers, as it serves as a tumor-suppressor gene. Subsequently, two p53 homologues, i.e., p73 and p63, with high identity of amino acids were identified, leading to construction of the p53 family. The p53 gene is highly important in human cancer because it usually transcribes genes that function by causing apoptosis in mammalian cells. In contrast, p63 and p73 tend to be more important in modulating development than inducing cell death, even though they share similar protein structures...
June 29, 2017: Journal of Microbiology, Immunology, and Infection, Wei Mian Yu Gan Ran za Zhi
https://www.readbyqxmd.com/read/28622093/suppressive-effect-of-dengue-virus-envelope-protein-domain-iii-on-megakaryopoiesis
#8
Guan-Ling Lin, Hsin-Hou Chang, Te-Sheng Lien, Po-Kong Chen, Hao Chan, Mei-Tzu Su, Chi-Yuan Liao, Der-Shan Sun
Dengue virus (DENV) infection can cause severe, life-threatening events, and no specific treatments of DENV infection are currently approved. Although thrombocytopenia is frequently observed in dengue patients, its pathogenesis is still not fully understood. Previous studies have suggested that DENV-induced thrombocytopenia occurs through viral-replication-mediated megakaryopoiesis inhibition in the bone marrow; however, the exact mechanism for megakaryopoiesis suppression remains elusive. In this study, a reductionist approach was applied, in which C57B/6J mice were inoculated with recombinant DENV-envelope protein domain III (DENV-EIII) instead of the full viral particle...
June 16, 2017: Virulence
https://www.readbyqxmd.com/read/28455958/csfv-induced-mitochondrial-fission-and-mitophagy-to-inhibit-apoptosis
#9
Hongchao Gou, Mingqiu Zhao, Hailuan Xu, Jin Yuan, Wencheng He, Mengjiao Zhu, Hongxing Ding, Lin Yi, Jinding Chen
Classical swine fever virus (CSFV), which causes typical clinical characteristics in piglets, including hemorrhagic syndrome and immunosuppression, is linked to hepatitis C and dengue virus. Oxidative stress and a reduced mitochondrial transmembrane potential are disturbed in CSFV-infected cells. The balance of mitochondrial dynamics is essential for cellular homeostasis. In this study, we offer the first evidence that CSFV induces mitochondrial fission and mitophagy to inhibit host cell apoptosis for persistent infection...
June 13, 2017: Oncotarget
https://www.readbyqxmd.com/read/28407282/vector-competence-and-innate-immune-responses-to-dengue-virus-infection-in-selected-laboratory-and-field-collected-stegomyia-aegypti-aedes-aegypti
#10
I M Serrato, P A Caicedo, Y Orobio, C Lowenberger, C B Ocampo
Control of dengue virus (DenV) transmission, primarily based on strategies to reduce populations of the principle vector Stegomya aegypti (= Aedes aegypti) (Diptera: Culicidae), is difficult to sustain over time. Other potential strategies aim to manipulate characteristics such as vector competence (VC), the innate capacity of the vector to transmit the virus. Previous studies have identified genetic factors, including differential expression of apoptosis-related genes, associated with the refractory and susceptible phenotypes in selected strains of S...
September 2017: Medical and Veterinary Entomology
https://www.readbyqxmd.com/read/28325921/zika-virus-genome-biology-and-molecular-pathogenesis
#11
REVIEW
Anyou Wang, Stephanie Thurmond, Leonel Islas, Kingyung Hui, Rong Hai
Zika virus (ZIKV) is an emerging RNA virus in the widespread Flavivirus genus. Recently, ZIKV has rapidly spread around the world and has been implicated in human disease, including neurological disorders, triggering public and scientific attention. Understanding how ZIKV causes disease is the highest priority, yet little is known about this virus. Here we examine the currently published data from ZIKV studies to provide the latest understanding of ZIKV genome biology and molecular pathogenesis. The ZIKV genome evolved rapidly from the Flavivirus genus and diverged from the members of this genus, even within the dengue virus cluster to which ZIKV belongs...
March 22, 2017: Emerging Microbes & Infections
https://www.readbyqxmd.com/read/28212581/the-inhibiting-effect-of-the-transcription-factor-p53-on-dengue-virus-infection-by-activating-the-type-i-interferon
#12
Yan-Ling Hu, Xiao-Shan Li, Shu Xiong, Qiang Ma, Dan Liu, Zhong-Quan Shi, Jing Tang, Xian-Cai Rao, Fu-Quan Hu, Guo-Li Li
To investigate the role of the transcription factor p53 in the course of the dengue virus (DV) infection. The human hepatocellular carcinoma cell strain HepG2 with a low expression level of p53 was built by using the retroviral-mediated RNA interference technology, and was detected by Western blot. The wild group and the interference group were respectively infected by the type 2 DV. The viral titration was detected by the Vero plaque assay, the viral multiplication was detected by the immunofluorescence, the cell apoptosis after virus infection was detected by FCM and the level of IFN-β was analyzed by ELISA...
April 11, 2017: Oncotarget
https://www.readbyqxmd.com/read/28207988/the-role-of-the-unfolded-protein-response-in-dengue-virus-pathogenesis
#13
REVIEW
Nilanka Perera, Joanna L Miller, Nicole Zitzmann
Symptomatic dengue virus (DENV) infections range from mild fever to severe haemorrhagic disease and death. Host-viral interactions play a significant role in deciding the fate of the infection. The unfolded protein response (UPR) is a prosurvival cellular reaction induced in response to DENV-mediated endoplasmic reticulum stress. The UPR has complex interactions with the cellular autophagy machinery, apoptosis, and innate immunity. DENV has evolved to manipulate the UPR to facilitate its replication and to evade host immunity...
May 2017: Cellular Microbiology
https://www.readbyqxmd.com/read/28188818/jnk1-2-inhibitor-reduces-dengue-virus-induced-liver-injury
#14
Gopinathan Pillai Sreekanth, Aporn Chuncharunee, Boonyarit Cheunsuchon, Sansanee Noisakran, Pa-Thai Yenchitsomanus, Thawornchai Limjindaporn
High viral load with liver injury is exhibited in severe dengue virus (DENV) infection. Mitogen activated protein kinases (MAPKs) including ERK1/2 and p38 MAPK were previously found to be involved in the animal models of DENV-induced liver injury. However, the role of JNK1/2 signaling in DENV-induced liver injury has never been investigated. JNK1/2 inhibitor, SP600125, was used to investigate the role of JNK1/2 signaling in the BALB/c mouse model of DENV-induced liver injury. SP600125-treated DENV-infected mice ameliorated leucopenia, thrombocytopenia, hemoconcentration, liver transaminases and liver histopathology...
February 7, 2017: Antiviral Research
https://www.readbyqxmd.com/read/28116673/preventive-and-therapeutic-challenges-in-combating-zika-virus-infection-are-we-getting-any-closer
#15
REVIEW
Meera V Singh, Emily A Weber, Vir B Singh, Nicole E Stirpe, Sanjay B Maggirwar
The neuroteratogenic nature of Zika Virus (ZIKV) infection has converted what would have been a tropical disease into a global threat. Zika is transmitted vertically via infected placental cells especially in the first and second trimesters. In the developing central nervous system (CNS), ZIKV can infect and induce apoptosis of neural progenitor cells subsequently causing microcephaly as well as other neuronal complications in infants. Its ability to infect multiple cell types (placental, dermal, and neural) and increased environmental stability as compared to other flaviviruses (FVs) has broadened the transmission routes for ZIKV infection from vector-mediated to transmitted via body fluids...
June 2017: Journal of Neurovirology
https://www.readbyqxmd.com/read/28100662/zika-virus-causes-supernumerary-foci-with-centriolar-proteins-and-impaired-spindle-positioning
#16
Benita Wolf, Fodé Diop, Pauline Ferraris, Sineewanlaya Wichit, Coralie Busso, Dorothée Missé, Pierre Gönczy
Zika virus (ZIKV) causes congenital microcephaly. Although ZIKV can impair cell cycle progression and provoke apoptosis, which probably contributes to disease aetiology through depletion of neural progenitor cells, additional cellular mechanisms may be important. Here, we investigated whether ZIKV infection alters centrosome number and spindle positioning, because such defects are thought to be at the root of inherited primary autosomal recessive microcephaly (MCPH). In addition to HeLa cells, in which centrosome number and spindle positioning can be well monitored, we analysed retinal epithelial cells (RPE-1), as well as brain-derived microglial (CHME-5) and neural progenitor (ReN) cells, using immunofluorescence...
January 2017: Open Biology
https://www.readbyqxmd.com/read/28077444/protein-interactions-during-the-flavivirus-and-hepacivirus-life-cycle
#17
REVIEW
Gisa Gerold, Janina Bruening, Bettina Weigel, Thomas Pietschmann
Protein-protein interactions govern biological functions in cells, in the extracellular milieu, and at the border between cells and extracellular space. Viruses are small intracellular parasites and thus rely on protein interactions to produce progeny inside host cells and to spread from cell to cell. Usage of host proteins by viruses can have severe consequences e.g. apoptosis, metabolic disequilibria, or altered cell proliferation and mobility. Understanding protein interactions during virus infection can thus educate us on viral infection and pathogenesis mechanisms...
April 2017: Molecular & Cellular Proteomics: MCP
https://www.readbyqxmd.com/read/28034555/impact-of-dengue-virus-serotype-denv-2-infection-on-liver-of-balb-c-mice-a-histopathological-analysis
#18
S Sakinah, Sivan Padma Priya, Sharmilah Kumari, Fatin Amira, Poorani K, Hiba Alsaeedy, Mok Pooi Ling, Hui-Yee Chee, Akon Higuchi, Abdullah A Alarfaj, Murugan A Munusamy, Kadarkarai Murugan, Che Norma Mat Taib, Palanisamy Arulselvan, Mariappan Rajan, Vasantha Kumari Neela, Rukman Awang Hamat, Giovanni Benelli, S Suresh Kumar
In this research, we characterized the histopathological impact of dengue virus (serotype DENV-2) infection in livers of BALB/c mice. The mice were infected with different doses of DENV-2 via intraperitoneal injection and liver tissues were processed for histological analyses and variation was documented. In the BALB/c mouse model, typical liver tissues showed regular hepatocyte architecture, with normal endothelial cells surrounding sinusoid capillary. Based on histopathological observations, the liver sections of BALB/c mice infected by DENV-2 exhibited a loss of cell integrity, with a widening of the sinusoidal spaces...
February 2017: Tissue & Cell
https://www.readbyqxmd.com/read/28003809/cytotoxic-cd4-t-cells-differentiation-function-and-application-to-dengue-virus-infection
#19
REVIEW
Yuan Tian, Alessandro Sette, Daniela Weiskopf
Dengue virus (DENV) has spread through most tropical and subtropical areas of the world and represents a serious public health problem. The control of DENV infection has not yet been fully successful due to lack of effective therapeutics or vaccines. Nevertheless, a better understanding of the immune responses against DENV infection may reveal new strategies for eliciting and improving antiviral immunity. T cells provide protective immunity against various viral infections by generating effector cells that cooperate to eliminate antigens and memory cells that can survive for long periods with enhanced abilities to control recurring pathogens...
2016: Frontiers in Immunology
https://www.readbyqxmd.com/read/27890856/sirna-cell-penetrating-peptides-complexes-as-a-combinatorial-therapy-against-chronic-myeloid-leukemia-using-bv173-cell-line-as-model
#20
João Miguel Freire, Inês Rego de Figueiredo, Javier Valle, Ana Salomé Veiga, David Andreu, Francisco J Enguita, Miguel A R B Castanho
Chronic myeloid leukemia (CML) is a myeloproliferative disorder caused by a single gene mutation, a reciprocal translocation that originates the Bcr-Abl gene with constitutive tyrosine kinase activity. As a monogenic disease, it is an optimum target for RNA silencing therapy. We developed a siRNA-based therapeutic approach in which the siRNA is delivered by pepM or pepR, two cell-penetrating peptides (CPPs) derived from the dengue virus capsid protein. These peptides have a dual role: siRNA delivery into cells and direct action as bioportides, i...
November 24, 2016: Journal of Controlled Release: Official Journal of the Controlled Release Society
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