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https://www.readbyqxmd.com/read/28228589/capsid-phosphorylation-state-and-hepadnavirus-virion-secretion
#1
Xiaojun Ning, Suresh H Basagoudanavar, Kuancheng Liu, Laurie Luckenbaugh, Duoqian Wei, Chunyan Wang, Bo Wei, Yingren Zhao, Taotao Yan, William Delaney, Jianming Hu
The C-terminal domain (CTD) of hepadnavirus core protein is involved in multiple steps of viral replication. In particular, CTD is initially phosphorylated at multiple sites to facilitate viral RNA packaging into immature nucleocapsids (NCs) and the early stage of viral DNA synthesis. For the avian hepadnavirus, the duck hepatitis B virus (DHBV), CTD is dephosphorylated subsequently to facilitate the late stage of viral DNA synthesis and to stabilize NCs containing mature viral DNA. The role of CTD phosphorylation in virion secretion, if any, has remained unclear...
February 22, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28223128/a-screening-assay-for-the-identification-of-host-cell-requirements-and-antiviral-targets-for-hepatitis-d-virus-infection
#2
Bettina Buchmann, Katinka Döhner, Thomas Schirdewahn, Beate Sodeik, Michael P Manns, Heiner Wedemeyer, Sandra Ciesek, Thomas von Hahn
Hepatitis delta virus (HDV) is a minimalistic satellite virus of hepatitis B virus (HBV). HBV/HDV co-infection, i.e. "hepatitis D", is the most severe form of viral hepatitis. No effective therapy for HDV infection is available partly due to the fact that HDV is a highly host-dependent virus devoid of any potentially drugable enzyme encoded in its small genome. In this study we present a semi-automated method to evaluate HDV infection and replication under the influence of different drugs. We utilized a Huh-7/hNTCP cell culture based system in a 96-well plate format, an automated microscope and image acquisition as well as analysis with the CellProfiler software to quantify the impact of these drugs on HDV infection...
February 18, 2017: Antiviral Research
https://www.readbyqxmd.com/read/28221022/quantitative-13c-traces-of-glucose-fate-in-hepatitis-b-virus-infected-hepatocytes
#3
Qianfen Wan, Yulan Wang, Huiru Tang
Quantitative characterization of 13C-labeled metabolites is an important part of the stable isotope tracing method widely used in metabolic flux analysis. Due to long relaxation time and low sensitivity of 13C nuclei, direct measurement of 13C labeled metabolites using one dimensional 13C NMR often fails to meet the demand of metabolomics studies especially with large number of samples and metabolites having low abundance. Although HSQC-based 2D NMR methods have improved sensitivity with inversion detection, they are time-consuming thus unsuitable for high-throughput absolute quantification of 13C-labeled metabolites...
February 21, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28195558/elevated-pre-treatment-il-18-level-is-associated-with-hbeag-seroconversion-in-hiv-hbv-coinfection
#4
Yijia Li, Jing Xie, Huanling Wang, Yang Han, Nidan Wang, Chloe L Thio, Taisheng Li
BACKGROUND: In hepatitis B virus (HBV) infected patients, hepatitis B e antigen (HBeAg) seroconversion is associated with better outcomes. Interleukin-18 (IL-18) controls hepatitis B replication in a mouse model. However, its role in treatment response in HIV/HBV co-infected patients is unknown. METHODS: We enrolled 35 treatment-naïve, HBeAg positive, HIV/HBV co-infected patients. HBV DNA, HIV RNA, CD4 cell count, HBV surface antigen (HBsAg) quantification (qHBsAg), HBeAg quantification (qHBeAg) and IL-18 levels were measured prior to, at 24 and 48 weeks of HBV-active combination antiretroviral therapy (cART)...
February 14, 2017: Antiviral Therapy
https://www.readbyqxmd.com/read/28186085/hepatitis-b-virus-x-protein-mediated-non-coding-rna-aberrations-in-the-development-of-human-hepatocellular-carcinoma
#5
REVIEW
Bei Zhang, Siqi Han, Bing Feng, Xiaoyuan Chu, Longbang Chen, Rui Wang
Hepatitis B virus (HBV) has an important role in the development of human hepatocellular carcinoma (HCC). Accumulated evidence has shown that HBV-encoded X protein (HBx) can induce both genetic alterations in tumor suppressor genes and oncogenes, as well as epigenetic aberrations in HCC pathogens. Non-coding RNAs (ncRNAs) mainly include microRNAs and long non-coding RNAs (lncRNAs). Although ncRNAs cannot code proteins, growing evidence has shown that they have various important biological functions in cell proliferation, cell cycle control, anti-apoptosis, epithelial-mesenchymal transition, tumor invasion and metastasis...
February 10, 2017: Experimental & Molecular Medicine
https://www.readbyqxmd.com/read/28163339/synthesis-and-antiviral-evaluation-of-2-2-3-3-tetrafluoro-nucleoside-analogs
#6
Ozkan Sari, Leda Bassit, Christina Gavegnano, Tamara R McBrayer, Louise McCormick, Bryan Cox, Steven J Coats, Franck Amblard, Raymond F Schinazi
Herein, we report the synthesis of novel 2',2',3',3'-tetrafluorinated nucleoside analogs along with their phosphoramidate prodrugs. A tetrafluoro ribose moiety was coupled with different Boc/benzoyl-protected nucleobases under Mitsunobu conditions. After deprotection, tetrafluorinated nucleosides 13b, 14b, 20b-22b were reacted with phenyl-(isopropoxy-L-alaninyl)-phosphorochloridate to afford corresponding monophosphate prodrugs 24b-28b. All synthesized compounds were evaluated against several DNA and RNA viruses including HIV, HBV, HCV, Ebola and Zika viruses...
February 15, 2017: Tetrahedron Letters
https://www.readbyqxmd.com/read/28157182/efficient-genome-replication-of-hepatitis-b-virus-using-adenovirus-vector-a-compact-pregenomic-rna-expression-unit
#7
Mariko Suzuki, Saki Kondo, Manabu Yamasaki, Norie Matsuda, Akio Nomoto, Tetsuro Suzuki, Izumu Saito, Yumi Kanegae
The complicated replication mechanisms of hepatitis B virus (HBV) have impeded HBV studies and anti-HBV therapy development as well. Herein we report efficient genome replication of HBV applying adenovirus vectors (AdVs) showing high transduction efficiency. Even in primary hepatocytes derived from humanized mice the transduction efficiencies using AdVs were 450-fold higher compared than those using plasmids. By using an expression unit consisting of the CMV promoter, 1.03-copy HBV genome and foreign poly(A) signal, we successfully generated an improved AdV (HBV103-AdV) that efficiently provided 58 times more pregenomic RNA than previously reported AdVs...
February 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28148795/hepatitis-b-virus-encoded-mirna-controls-viral-replication
#8
Xi Yang, Hongfeng Li, Huahui Sun, Hongxia Fan, Yaqi Hu, Min Liu, Xin Li, Hua Tang
: microRNAs (miRNAs) are a class of small single-stranded non-coding functional RNAs. Hepatitis B virus (HBV) is an enveloped DNA virus with virions and subviral forms of particles that lack a core. It was not known whether HBV encodes miRNAs. Here, we identified an HBV-encoded miRNA (called HBV-miR-3) by deep sequencing and northern blot. HBV-miR-3 is located at nts 373-393 of the HBV genome and was generated from 3.5Kb, 2,4Kb and 2.1Kb HBV in classic miRNA biogenesis (Drosha-Dicer dependent) manner...
February 1, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28141591/impact-of-interleukin-28b-rs12979860-c-t-polymorphism-on-severity-of-disease-and-response-to-treatment-in-hepatitis-delta
#9
Murat Ispiroglu, Ibrahim Halil Bahcecioglu, Ulvi Demirel, Mehmet Yalniz
INTRODUCTION: Pegylated-interferon alpha (Peg-IFN α) is the therapy most commonly used to treat chronic hepatitis delta virus (HDV) infection. In the present study, we planned to investigate effect of IL28B polymorphism on response to Peg-IFN α therapy and disease progression in patients with chronic HDV. METHODOLOGY: A total of 47 patients who received Peg-IFNα therapy for at least one year were investigated. The patients were divided into three groups based on their response to treatment: sustained viral response (SVR) (32%), unresponsive (53%), and relapse (15%)...
January 30, 2017: Journal of Infection in Developing Countries
https://www.readbyqxmd.com/read/28126637/characterization-of-contrasting-features-between-hepatitis-b-virus-genotype-a-and-genotype-d-in-small-envelope-protein-expression-and-surface-antigen-secretion
#10
Fei Zhang, Xiaoli Tang, Tamako Garcia, Anna S Lok, Yongxiang Wang, Haodi Jia, Yanli Qin, Chaoyang Chen, Yumei Wen, Jisu Li, Shuping Tong
Hepatitis B virus (HBV) genotypes A and D are prevalent in many parts of the world and show overlapping geographic distributions. We amplified the entire HBV genome from sera of patients with genotypes A and D and generated overlength constructs for transient transfection into Huh7 or HepG2 cells. Genotype D clones were associated with less HBsAg in culture supernatant and even less intracellular HBsAg. They produced less 2.1-kb RNA due to a weaker SPII promoter. Chimeric promoter constructs identified three divergent positions as most critical, and their exchange reversed extracellular HBsAg phenotype...
January 23, 2017: Virology
https://www.readbyqxmd.com/read/28126507/-hepatitis-delta-clinical-aspects-and-therapeutic-perspectives
#11
Dulce Alfaiate, Clothilde Miaglia, Fabien Zoulim
HDV prevalence must not be disregarded, as the virus is associated with a higher severity of hepatic disease. All HBV carriers should be tested for HDV as well, at least once during the disease history, and in case of worsening of a chronic HBV hepatitis. Diagnosis should rely on anti-HDV antibody testing, and confirmed by HDV RNA detection and quantification by RT-qPCR. The only treatment available is pegylated alpha interferon. Optimal duration of treatment has not yet been proven, and relapses are common...
January 23, 2017: La Presse Médicale
https://www.readbyqxmd.com/read/28121714/hepatitis-delta-and-hiv-infection
#12
Vincent Soriano, Kenneth E Sherman, Pablo Barreiro
Viral liver diseases are frequent co-morbidities and major contributors to death in HIV-positive individuals on antiretroviral therapy. Whereas cure of hepatitis C and control of hepatitis B with antivirals avert liver disease progression in most HIV-coinfected patients, the lack of satisfactory treatment for hepatitis delta virus (HDV) infection remains a major threat for developing cirrhosis and liver cancer in this population. In the European Union and North America, sexual contact has replaced injection drug use has major transmission route for HDV in HIV-positive persons...
January 24, 2017: AIDS
https://www.readbyqxmd.com/read/28117723/nuclear-import-of-hepatitis-b-virus-capsids-and-genome
#13
REVIEW
Lara Gallucci, Michael Kann
Hepatitis B virus (HBV) is an enveloped pararetrovirus with a DNA genome, which is found in an up to 36 nm-measuring capsid. Replication of the genome occurs via an RNA intermediate, which is synthesized in the nucleus. The virus must have thus ways of transporting its DNA genome into this compartment. This review summarizes the data on hepatitis B virus genome transport and correlates the finding to those from other viruses.
January 21, 2017: Viruses
https://www.readbyqxmd.com/read/28107607/epidemiology-update-for-hepatitis-c-virus-and-hepatitis-b-virus-in-end-stage-renal-disease-in-france-r%C3%A3-seau-epid%C3%A3-miologique-et-information-en-n%C3%A3-phrologie-registry
#14
Corinne Isnard Bagnis, Cécile Couchoud, Marc Bowens, Ayman Sarraj, Gilbert Deray, Jérôme Tourret, Patrice Cacoub, Sophie Tezenas du Montcel
BACKGROUND AND AIMS: Risk for HCV/HBV infection is increased in ESRD patients. We generate updated epidemiological data. METHODS: Based on the National French registry for ESRD, we extracted data for patients who started dialysis or preemptive transplantation between January, 2005 and December, 2013. A positive serum HBs Ag and/or a positive HCV RNA defined HBV and HCV infections, respectively. RESULTS: 72,948 patients were included among which 62...
January 20, 2017: Liver International: Official Journal of the International Association for the Study of the Liver
https://www.readbyqxmd.com/read/28099188/hepatitis-b-incidence-and-prevention-with-antiretroviral-therapy-among-hiv-positive-individuals-in-rakai-uganda
#15
Emmanuel Seremba, Victor Ssempijja, Sarah Kalibbala, Ronald H Gray, Maria J Wawer, Fred Nalugoda, Corey Casper, Warren T Phipps, Ponsiano Ocama, David Serwadda, David L Thomas, Steven Reynolds
OBJECTIVE: Antiretroviral therapy (ART) may interfere with replication of hepatitis B (HBV) raising the hypothesis that HBV infection might be prevented by ART. We investigated the incidence and risk factors associated with HBV among HIV-infected adults in Rakai, Uganda. METHODS: We screened stored sera from 944 HIV-infected adults enrolled in the Rakai Community Cohort Study between September 2003 and March 2015 for evidence of HBV exposure. Serum from participants who tested anti-HBc negative (497) at baseline were tested over 3-7 consecutive survey rounds for incident HBV...
January 17, 2017: AIDS
https://www.readbyqxmd.com/read/28098260/hepatitis-b-virus-x-protein-is-capable-of-down-regulating-protein-level-of-host-antiviral-protein-apobec3g
#16
Ruidong Chen, Xue Zhao, Yongxiang Wang, Youhua Xie, Jing Liu
The apolipoprotein B mRNA editing catalytic polypeptide-like (APOBEC) family proteins bind RNA and single-stranded DNA, and create C-to-U base modifications through cytidine deaminase activity. APOBEC3G restricts human immunodeficiency virus 1 (HIV-1) infection by creating hypermutations in proviral DNA, while HIV-1-encoded vif protein antagonizes such restriction by targeting APOBEC3G for degradation. APOBEC3G also inhibits hepatitis B virus (HBV): APOBEC3G co-expression inhibits HBV replication and evidences exist indicating APOBEC3G-mediated HBV hypermutations in patients...
January 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28095508/the-smc5-6-complex-restricts-hbv-when-localized-to-nd10-without-inducing-an-innate-immune-response-and-is-counteracted-by-the-hbv-x-protein-shortly-after-infection
#17
Congrong Niu, Christine M Livingston, Li Li, Rudolf K Beran, Stephane Daffis, Dhivya Ramakrishnan, Dara Burdette, Leanne Peiser, Eduardo Salas, Hilario Ramos, Mei Yu, Guofeng Cheng, Michel Strubin, William E Delaney Iv, Simon P Fletcher
The structural maintenance of chromosome 5/6 complex (Smc5/6) is a restriction factor that represses hepatitis B virus (HBV) transcription. HBV counters this restriction by expressing HBV X protein (HBx), which targets Smc5/6 for degradation. However, the mechanism by which Smc5/6 suppresses HBV transcription and how HBx is initially expressed is not known. In this study we characterized viral kinetics and the host response during HBV infection of primary human hepatocytes (PHH) to address these unresolved questions...
2017: PloS One
https://www.readbyqxmd.com/read/28087399/advances-with-using-crispr-cas-mediated-gene-editing-to-treat-infections-with-hepatitis-b-virus-and-hepatitis-c-virus
#18
REVIEW
Buhle Moyo, Kristie Bloom, Tristan Scott, Abdullah Ely, Patrick Arbuthnot
Chronic infections with hepatitis B and hepatitis C viruses (HBV and HCV) account for the majority of cases of cirrhosis and hepatocellular carcinoma. Current therapies for the infections have limitations and improved efficacy is necessary to prevent complications in carriers of the viruses. In the case of HBV persistence, the replication intermediate comprising covalently closed circular DNA (cccDNA) is particularly problematic. Licensed therapies have little effect on cccDNA and HBV replication relapses following treatment withdrawal...
January 10, 2017: Virus Research
https://www.readbyqxmd.com/read/28079152/a-novel-toolbox-for-the-in-vitro-assay-of-hepatitis-d-virus-infection
#19
Jing-Hua Zhao, Ya-Li Zhang, Tian-Ying Zhang, Lun-Zhi Yuan, Tong Cheng, Pei-Jer Chen, Quan Yuan, Ning-Shao Xia
Hepatitis D virus (HDV) is a defective RNA virus that requires the presence of hepatitis B virus (HBV) for its life cycle. The in vitro HDV infection system is widely used as a surrogate model to study cellular infection with both viruses owing to its practical feasibility. However, previous methods for running this system were less efficient for high-throughput screening and large-scale studies. Here, we developed a novel method for the production of infectious HDV by adenoviral vector (AdV)-mediated transduction...
January 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28067163/hbv-coinfection-is-associated-with-reduced-cd4-response-to-antiretroviral-treatment-in-pregnancy
#20
Marco Floridia, Giulia Masuelli, Enrica Tamburrini, Arsenio Spinillo, Giuliana Simonazzi, Giovanni Guaraldi, Anna Maria Degli Antoni, Pasquale Martinelli, Vincenzo Portelli, Serena Dalzero, Marina Ravizza
OBJECTIVE: To evaluate the impact of Hepatitis B virus (HBV) coinfection on response to antiretroviral treatment in pregnant women with HIV. METHODS: Retrospective analysis of a large case series of pregnant women with HIV in Italy; outcome measures were CD4 changes, HIV viral load, and main pregnancy outcomes (preterm delivery, low birthweight, intrauterine growth restriction, mode of delivery, and major birth defects). RESULTS: Rate of HBV coinfection among 1462 pregnancies was 12...
January 9, 2017: HIV Clinical Trials
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