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https://www.readbyqxmd.com/read/28303345/detection-and-characterization-of-hepatitis-a-virus-circulating-in-egypt
#1
Hazem Hamza, Dina Nadeem Abd-Elshafy, Sayed A Fayed, Mahmoud Mohamed Bahgat, Nagwa Abass El-Esnawy, Emam Abdel-Mobdy
Hepatitis A virus (HAV) still poses a considerable problem worldwide. In the current study, hepatitis A virus was recovered from wastewater samples collected from three wastewater treatment plants over one year. Using RT-PCR, HAV was detected in 43 out of 68 samples (63.2%) representing both inlet and outlet. Eleven positive samples were subjected to sequencing targeting the VP1-2A junction region. Phylogenetic analysis revealed that all samples belonged to subgenotype IB with few substitutions at the amino acid level...
March 16, 2017: Archives of Virology
https://www.readbyqxmd.com/read/28303198/impacts-of-leaf-age-and-heat-stress-duration-on-photosynthetic-gas-exchange-and-foliar-nonstructural-carbohydrates-in-coffea-arabica
#2
Danielle E Marias, Frederick C Meinzer, Christopher Still
Given future climate predictions of increased temperature, and frequency and intensity of heat waves in the tropics, suitable habitat to grow ecologically, economically, and socially valuable Coffea arabica is severely threatened. We investigated how leaf age and heat stress duration impact recovery from heat stress in C. arabica. Treated plants were heated in a growth chamber at 49°C for 45 or 90 min. Physiological recovery was monitored in situ using gas exchange, chlorophyll fluorescence (the ratio of variable to maximum fluorescence, FV/FM), and leaf nonstructural carbohydrate (NSC) on mature and expanding leaves before and 2, 15, 25, and 50 days after treatment...
February 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28302145/genomic-organization-and-recombination-analysis-of-a-porcine-sapovirus-identified-from-a-piglet-with-diarrhea-in-china
#3
Jingjiao Li, Quan Shen, Wen Zhang, Tingting Zhao, Yi Li, Jing Jiang, Xiangqian Yu, Zhibo Guo, Li Cui, Xiuguo Hua
BACKGROUND: Sapovirus (SaV), a member of the family Caliciviridae, is an etiologic agent of gastroenteritis in humans and pigs. To date, both intra- and inter-genogroup recombinant strains have been reported in many countries except for China. Here, we report an intra-genogroup recombination of porcine SaV identified from a piglet with diarrhea of China. METHODS: A fecal sample from a 15-day-old piglet with diarrhea was collected from Shanghai, China. Common agents of gastroenteritis including porcine circovirus type 2, porcine rotavirus, porcine transmissible gastroenteritis virus, porcine SaV, porcine norovirus, and porcine epidemic diarrhea virus were detected by RT-PCR or PCR method...
March 16, 2017: Virology Journal
https://www.readbyqxmd.com/read/28291746/crystal-structure-of-full-length-zika-virus-ns5-protein-reveals-a-conformation-similar-to-japanese-encephalitis-virus-ns5
#4
Anup K Upadhyay, Matthew Cyr, Kenton Longenecker, Rakesh Tripathi, Chaohong Sun, Dale J Kempf
The rapid spread of the recent Zika virus (ZIKV) epidemic across various countries in the American continent poses a major health hazard for the unborn fetuses of pregnant women. To date, there is no effective medical intervention. The nonstructural protein 5 of Zika virus (ZIKV-NS5) is critical for ZIKV replication through the 5'-RNA capping and RNA polymerase activities present in its N-terminal methyltransferase (MTase) and C-terminal RNA-dependent RNA polymerase (RdRp) domains, respectively. The crystal structure of the full-length ZIKV-NS5 protein has been determined at 3...
March 1, 2017: Acta Crystallographica. Section F, Structural Biology Communications
https://www.readbyqxmd.com/read/28288679/muscovy-duck-reovirus-%C3%AF-ns-protein-triggers-autophagy-enhancing-virus-replication
#5
Yijian Wu, Longping Cui, Erpeng Zhu, Wuduo Zhou, Quanxi Wang, Xiaoping Wu, Baocheng Wu, Yifan Huang, Hung-Jen Liu
BACKGROUND: Muscovy duck reovirus (MDRV) causes high morbidity and mortality in Muscovy ducklings at 10 days old and can persist in an infected flock until the ducklings of 6 weeks old. It shares common physicochemical properties with avian reovirus (ARV) and differs in coding assignment and pathogenicity. The ARV p17 protein has been shown to trigger autophagy via activation multiple signaling pathways, which benefits virus replication. Since MDRV lacks the p17 protein, whether and how MDRV induces autophagy remains unknown...
March 14, 2017: Virology Journal
https://www.readbyqxmd.com/read/28283039/hepatitis-c-virus-ns3-protein-enhances-hepatocellular-carcinoma-cell-invasion-by-promoting-ppm1a-ubiquitination-and-degradation
#6
Yali Zhou, Yan Zhao, Yaoying Gao, Wenjun Hu, Yan Qu, Ning Lou, Ying Zhu, Xiaoping Zhang, Hongmei Yang
BACKGROUND: Growing evidence suggests that hepatitis C virus (HCV) contributes to hepatocellular carcinoma (HCC) by directly modulating oncogenic signaling pathways. Protein phosphatase magnesium-dependent 1A (PPM1A) has recently emerged as an important tumor suppressor as it can block a range of tumor-centric signaling pathways through protein dephosphorylation. However, the role and regulatory mechanisms of PPM1A in HCV-infected cells have not been reported. METHODS: Total, cytoplasmic, and nuclear PPM1A protein after HCV infection or overexpression of HCV nonstructural protein 3 (NS3) were detected by western blotting...
March 10, 2017: Journal of Experimental & Clinical Cancer Research: CR
https://www.readbyqxmd.com/read/28280374/optimizing-choice-of-oral-interferon-free-treatment-for-genotype-1-hepatitis-c-virus-using-testing-for-ns5a-resistance-a-cost-utility-analysis-from-the-perspective-of-the-italian-national-health-service
#7
Kirsten Y Westerhout, Walter Bouwmeester, Inge Duchesne, Marta Pisini, Marjanne A Piena, Francesco Damele, Beatrice Gueron, Maarten Treur, Jonathan Belsey
BACKGROUND: Patients with genotype-1 hepatitis C virus infection who have failed to respond to standard therapy or who relapse following treatment may be considered for an interferon-free regimen incorporating a nonstructural protein 5A (NS5A) inhibitor. Sustained virologic response (SVR) with these regimens is typically >90%, but this is reduced in patients with NS5A resistance. European Association for Study of the Liver guidelines recommend simeprevir + sofosbuvir ± ribavirin (SMV+SOF±R) for re-treating patients failing an NS5A inhibitor-containing regimen...
2017: ClinicoEconomics and Outcomes Research: CEOR
https://www.readbyqxmd.com/read/28266920/morbidity-and-mortality-conferences-a-narrative-review-of-strategies-to-prioritize-quality-improvement
#8
Vanessa Giesbrecht, Selena Au
BACKGROUND: The morbidity and mortality conference (MMC) provides a valuable opportunity to review patient care processes and safety concerns, aligning with a growing quality improvement (QI) mandate. Yet the structure, processes, and aims of many MMCs are often ill-defined. This review summarizes strategies employed by medical, surgical, and critical care departments in the development of patient safety-centered MMCs. METHODS: A structured narrative review of literature was conducted using combinations of the search terms "morbidity and mortality conference(s)," "morbidity and mortality meetings," or "morbidity and mortality round(s)...
November 2016: Joint Commission Journal on Quality and Patient Safety
https://www.readbyqxmd.com/read/28263312/diagnosis-of-zika-virus-infection-on-a-nanotechnology-platform
#9
Bo Zhang, Benjamin A Pinsky, Jeyarama S Ananta, Su Zhao, Shylaja Arulkumar, Hao Wan, Malaya K Sahoo, Janaki Abeynayake, Jesse J Waggoner, Clay Hopes, Meijie Tang, Hongjie Dai
We developed a multiplexed assay on a plasmonic-gold platform for measuring IgG and IgA antibodies and IgG avidity against both Zika virus (ZIKV) and dengue virus (DENV) infections. In contrast to IgM cross-reactivity, IgG and IgA antibodies against ZIKV nonstructural protein 1 (NS1) antigen were specific to ZIKV infection, and IgG avidity revealed recent ZIKV infection and past DENV-2 infection in patients in dengue-endemic regions. This assay could enable specific diagnosis of ZIKV infection over other flaviviral infections...
March 6, 2017: Nature Medicine
https://www.readbyqxmd.com/read/28260862/sofosbuvir-velpatasvir-regimen-promises-an-effective-pan-genotypic-hepatitis-c-virus-cure
#10
REVIEW
Fazia Mir, Alp S Kahveci, Jamal A Ibdah, Veysel Tahan
Hepatitis C virus (HCV) is a global pandemic, with nearly 200 million infected patients worldwide. HCV is the most common blood-borne infection in the US with numerous health implications including liver fibrosis, cirrhosis, and hepatocellular cancer. Traditional genotype-based HCV therapies with interferon resulted in moderate success in the sustained elimination of viral genome. Recent clinical trials of the once-daily combination tablet of sofosbuvir, a nonstructural (NS) 5B polymerase inhibitor, and velpatasvir, an NS5A inhibitor, demonstrate sustained virologic response rates of about 95%, regardless of prior treatment experience or presence of cirrhosis across all HCV genotypes...
2017: Drug Design, Development and Therapy
https://www.readbyqxmd.com/read/28258380/clinical-pharmacokinetics-of-dasabuvir
#11
REVIEW
Jennifer R King, Jiuhong Zha, Amit Khatri, Sandeep Dutta, Rajeev M Menon
Dasabuvir is a nonstructural (NS) 5B non-nucleoside inhibitor of the hepatitis C virus (HCV) used in combination with ombitasvir/paritaprevir/ritonavir for the treatment of chronic HCV infection. It is primarily metabolized by cytochrome P450 (CYP) 2C8, with a minor contribution from CYP3A. Biotransformation of dasabuvir forms the M1 metabolite, which retains antiviral activity. Dasabuvir exhibits linear pharmacokinetics with a terminal half-life of approximately 5-8 h, allowing for twice-daily dosing. The M1 metabolite of dasabuvir is the major metabolite in plasma and has a half-life similar to that of dasabuvir...
March 4, 2017: Clinical Pharmacokinetics
https://www.readbyqxmd.com/read/28257598/structural-basis-for-dimerization-and-rna-binding-of-avian-infectious-bronchitis-virus-nsp9
#12
Tingting Hu, Cheng Chen, Huiyan Li, Yanshu Dou, Ming Zhou, Deren Lu, Qi Zong, Yulei Li, Cheng Yang, Zhihui Zhong, Namit Singh, Honggang Hu, Rundong Zhang, Haitao Yang, Dan Su
The potential for infection by coronaviruses (CoVs) has become a serious concern with the recent emergence of Middle East respiratory syndrome (MERS) and severe acute respiratory syndrome (SARS) in the human population. CoVs encode two large polyproteins, which are then processed into 15-16 nonstructural proteins (nsps) that make significant contributions to viral replication and transcription by assembling the RNA replicase complex. Among them, nsp9 plays an essential role in viral replication by forming a homodimer that binds single-stranded RNA...
March 3, 2017: Protein Science: a Publication of the Protein Society
https://www.readbyqxmd.com/read/28256607/the-rotavirus-nsp4-viroporin-domain-is-a-calcium-conducting-ion-channel
#13
Thieng Pham, Jacob L Perry, Timothy L Dosey, Anne H Delcour, Joseph M Hyser
Viroporins are small virus-encoded ion channel proteins. Most viroporins are monovalent selective cation channels, with few showing the ability to conduct divalent cations, like calcium (Ca(2+)). Nevertheless, some viroporins are known to disrupt host cell Ca(2+) homeostasis, which is critical for virus replication and pathogenesis. Rotavirus nonstructural protein 4 (NSP4) is an endoplasmic reticulum transmembrane glycoprotein that has a viroporin domain (VPD), and NSP4 viroporin activity elevates cytosolic Ca(2+) in mammalian cells...
March 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28250121/porcine-deltacoronavirus-nsp5-antagonizes-type-i-interferon-signaling-by-cleaving-stat2
#14
Xinyu Zhu, Dang Wang, Junwei Zhou, Ting Pan, Jiyao Chen, Yuting Yang, Mengting Lv, Xu Ye, Guiqing Peng, Liurong Fang, Shaobo Xiao
Porcine deltacoronavirus (PDCoV) is an emerging swine enteropathogenic coronavirus. The first outbreak of PDCoV was announced from the United States in 2014, followed by reports in Asia. The nonstructural protein nsp5 is a 3C-like protease of coronavirus and our previous study showed that PDCoV nsp5 inhibits type I interferon (IFN) production. In this study, we found that PDCoV nsp5 significantly inhibited IFN-stimulated response element (ISRE) promoter activity and transcription of IFN-stimulated genes (ISGs), suggesting that PDCoV nsp5 also suppresses IFN signaling...
March 1, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28245093/novel-nucleoside-analogues-targeting-hcv-replication-through-an-ns5a-dependent-inhibition-mechanism
#15
Nikolaos Lougiakis, Efseveia Frakolaki, Panagiota Karmou, Nicole Pouli, Panagiotis Marakos, Vanesa Madan, Ralf Bartenschlager, Niki Vassilaki
A series of new tricyclic nucleosides were synthesized and evaluated as Hepatitis C virus (HCV) replication inhibitors. Initial screening in a HCV replicon system, derived from a genotype 1b isolate, identified 9-benzylamino-3-(β-D-ribofuranosyl)-3H-imidazo[4',5':5,6]pyrido[2,3-b]pyrazine (15d) as the most potent analogue. Comparative assessment of 15d activity against HCV full-length viruses or subgenomic replicons derived from genotype 1 - 4 revealed a specificity of the compound for genotypes 1 and 3. Surprisingly, resistance mutations selected against 15d were mapped to domains II and III of the nonstructural protein 5A (NS5A), but not to the RNA-dependent RNA polymerase residing in NS5B...
February 28, 2017: Chemical Biology & Drug Design
https://www.readbyqxmd.com/read/28240747/antibodies-against-nonstructural-protein-1-protect-mice-from-dengue-virus-induced-mast-cell-activation
#16
Ya-Ting Chu, Shu-Wen Wan, Yu-Chang Chang, Chien-Kuo Lee, Betty A Wu-Hsieh, Robert Anderson, Yee-Shin Lin
Dengue virus (DENV) infection causes dengue fever, dengue hemorrhagic fever (DHF), and dengue shock syndrome (DSS). DHF/DSS patients have been reported to have increased levels of urinary histamine, chymase, and tryptase, which are major granule-associated mediators from mast cells. Previous studies also showed that DENV-infected human mast cells induce production of proinflammatory cytokines and chemokines, suggesting a role played by mast cells in vascular perturbation as well as leukocyte recruitment. In this study, we show that DENV but not UV-inactivated DENV enhanced degranulation of mast cells and production of chemokines (MCP-1, RANTES, and IP-10) in a mouse model...
February 27, 2017: Laboratory Investigation; a Journal of Technical Methods and Pathology
https://www.readbyqxmd.com/read/28240369/growth-reduction-after-defoliation-is-independent-of-co2-supply-in-deciduous-and-evergreen-young-oaks
#17
Sandra Schmid, Sara Palacio, Günter Hoch
Reduced productivity of trees after defoliation might be caused by limited carbon (C) availability. We investigated the combined effect of different atmospheric CO2 concentrations (160, 280 and 560 ppm) and early season defoliation on the growth and C reserves (nonstructural carbohydrates (NSC)) of saplings of two oak species with different leaf habits (deciduous Quercus petraea and evergreen Quercus ilex). In both species, higher CO2 supply significantly enhanced growth. Defoliation had a strong negative impact on growth (stronger for Q...
February 27, 2017: New Phytologist
https://www.readbyqxmd.com/read/28236746/discovery-of-a-novel-antiviral-agent-targeting-the-nonstructural-protein-4-nsp4-of-chikungunya-virus
#18
Yuji Wada, Yasuko Orba, Michihito Sasaki, Shintaro Kobayashi, Michael J Carr, Haruaki Nobori, Akihiko Sato, William W Hall, Hirofumi Sawa
Chikungunya fever (CHIKF) is caused by chikungunya virus (CHIKV) infection which is a re-emerging mosquito-borne zoonosis. At present, there are no approved therapeutics for CHIKF. Herein, we have investigated candidate compounds which can inhibit CHIKV infection. Screening of chemical compound libraries were performed and one candidate, a benzimidazole-related compound designated Compound-A was found to inhibit infection by several CHIKV strains and a Sindbis virus strain at nanomolar concentrations. To investigate the inhibitory mechanism of action, a Compound-A resistant CHIKV (res-CHIKV) was isolated and a key mutation associated with resistance was identified by reverse-genetic recombinant CHIKVs containing amino acid substitutions present in res-CHIKV...
February 22, 2017: Virology
https://www.readbyqxmd.com/read/28236252/clinical-pharmacokinetics-of-paritaprevir
#19
REVIEW
Rajeev M Menon, Akshanth R Polepally, Amit Khatri, Walid M Awni, Sandeep Dutta
Paritaprevir is a potent hepatitis C virus (HCV) nonstructural (NS) protein 3/4A protease inhibitor that is used in combination with other direct-acting antivirals (DAAs) for the treatment of chronic HCV infection. Paritaprevir is primarily metabolized by cytochrome P450 (CYP) 3A4 and is administered with a low dose of ritonavir to achieve drug concentrations suitable for once-daily dosing. Coadministration of paritaprevir with ritonavir increases the half-life of single-dose paritaprevir from approximately 3 h to 5-8 h, doubles the time to maximum plasma concentration (T max) from 2...
February 25, 2017: Clinical Pharmacokinetics
https://www.readbyqxmd.com/read/28235682/nuclear-imprisonment-of-host-cellular-mrna-by-nsp1%C3%AE-protein-of-porcine-reproductive-and-respiratory-syndrome-virus
#20
Mingyuan Han, Hanzhong Ke, Qingzhan Zhang, Dongwan Yoo
Positive-strand RNA genomes function as mRNA for viral protein synthesis which is fully reliant on host cell translation machinery. Competing with cellular protein translation apparatus needs to ensure the production of viral proteins, but this also stifles host innate defense. In the present study, we showed that porcine reproductive and respiratory syndrome virus (PRRSV), whose replication takes place in the cytoplasm, imprisoned host cell mRNA in the nucleus, which suggests a novel mechanism to enhance translation of PRRSV genome...
February 18, 2017: Virology
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