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https://www.readbyqxmd.com/read/29031164/productive-replication-of-avian-influenza-viruses-in-chicken-endothelial-cells-is-determined-by-hemagglutinin-cleavability-and-is-related-to-innate-immune-escape
#1
Adrien Lion, Mathilde Richard, Evelyne Esnault, Emmanuel Kut, Denis Soubieux, Vanaïque Guillory, Mélody Germond, Caroline Blondeau, Rodrigo Guabiraba, Kirsty R Short, Daniel Marc, Pascale Quéré, Sascha Trapp
Endotheliotropism is a hallmark of gallinaceous poultry infections with highly pathogenic avian influenza (HPAI) viruses and a feature that distinguishes HPAI from low pathogenic avian influenza (LPAI) viruses. Here, we used chicken aortic endothelial cells (chAEC) as a novel in vitro infection model to assess the susceptibility, permissiveness, and host response of chicken endothelial cells (EC) to infections with avian influenza (AI) viruses. Our data show that productive replication of AI viruses in chAEC is critically determined by hemagglutinin cleavability, and is thus an exclusive trait of HPAI viruses...
October 11, 2017: Virology
https://www.readbyqxmd.com/read/29031157/a-european-multi-centre-external-quality-assessment-eqa-study-on-phenotypic-and-genotypic-methods-used-for-herpes-simplex-virus-hsv-drug-resistance-testing
#2
Baharak Afshar, David F Bibby, Renata Piorkowska, Natasha Ohemeng-Kumi, Robert Snoeck, Graciela Andrei, Sarah Gillemot, Florence Morfin, Emilie Frobert, Sonia Burrel, David Boutolleau, Brendan Crowley, Jean L Mbisa
BACKGROUND: Herpes Simplex Virus (HSV) drug resistance is a significant public health concern among immunocompromised individuals. Phenotypic assays are considered the gold standard method for detecting HSV drug resistance. However, plaque reduction assays (PRAs) are technically demanding, often with long turnaround times of up to four weeks. In contrast, genotypic tests can be performed within a few days. OBJECTIVES: The development and coordination of the first European External Quality Assessment (EQA) study to evaluate phenotypic and genotypic methods used for HSV drug resistance testing in specialised reference laboratories...
October 6, 2017: Journal of Clinical Virology: the Official Publication of the Pan American Society for Clinical Virology
https://www.readbyqxmd.com/read/29031073/discovery-of-novel-diarylpyrazolylquinoline-derivatives-as-potent-anti-dengue-virus-agents
#3
Jin-Ching Lee, Chin-Kai Tseng, Chun-Kuang Lin, Chih-Hua Tseng
A number of diarylpyrazolylquinoline derivatives were synthesized and evaluated for their anti-dengue virus (DENV) activity. Among them, 6-fluoro-2-(1-(4-fluorophenyl)-3- (4-methoxyphenyl)-1H-pyrazol-5-yl)quinoline (11c), 2-[1,3-bis(4-methoxyphenyl)-1H-pyrazol- 5-yl]-6-fluoroquinoline (12c), and 4-[5-(6-fluoroquinolin-2-yl)-3-(4-methoxyphenyl)-1H-pyrazol- 1-yl]benzenesulfonamide (13c) exhibited approximately 10-folds more active anti-DENV-2 activity (IC50 of 1.36, 1.09 and 0.81 μM, respectively) than that of ribavirin (IC50 = 12...
October 3, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29031062/design-synthesis-and-biological-evaluations-of-n-hydroxy-thienopyrimidine-2-4-diones-as-inhibitors-of-hiv-reverse-transcriptase-associated-rnase-h
#4
Jayakanth Kankanala, Karen A Kirby, Andrew D Huber, Mary C Casey, Daniel J Wilson, Stefan G Sarafianos, Zhengqiang Wang
Human immunodeficiency virus (HIV) reverse transcriptase (RT) associated ribonuclease H (RNase H) is the only HIV enzymatic function not targeted by current antiviral drugs. Although various chemotypes have been reported to inhibit HIV RNase H, few have shown significant antiviral activities. We report herein the design, synthesis and biological evaluation of a novel N-hydroxy thienopyrimidine-2,3-dione chemotype (11) which potently and selectively inhibited RNase H with considerable potency against HIV-1 in cell culture...
September 28, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29029245/host-transcription-profile-in-nasal-epithelium-and-whole-blood-of-hospitalised-children-under-two-years-of-age-with-respiratory-syncytial-virus-infection
#5
Lien Anh Ha Do, Johann Pellet, H Rogier van Doorn, Anh Tuan Tran, Bach Hue Nguyen, Thi Thu Loan Tran, Quynh Huong Tran, Quoc Bao Vo, Nguyen Anh Tran Dac, Hong Nhien Trinh, Thi Thanh Hai Nguyen, Bao Tinh Le Binh, Huu Mai Khanh Nguyen, Minh Tien Nguyen, Quang Tung Thai, Thanh Vu Vo, Ngoc Quang Minh Ngo, Thi Kim Huyen Dang, Ngoc Huong Cao, Thu Van Tran, Lu Viet Ho, Bertrand De Meulder, Charles Auffray, Jorrit-Jan Hofstra, Jeremy Farrar, Juliet E Bryant, Menno de Jong, Martin L Hibberd
Most insights into the cascade of immune events following acute respiratory syncytial virus (RSV) infection have been obtained from animal experiments or in vitro models. Here we investigated host gene expression profiles in nasopharyngeal swabs (NP) and whole blood samples during natural RSV and rhinovirus (hRV) infection (acute versus early recovery phase) in 83 hospitalised patients <2 years old with lower respiratory tract infections (LRTI). RSV infection induced strong and persistent innate immune responses including interferon signaling and pathways related to chemokine/cytokine signaling in both compartments...
September 27, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/29029102/nucleos-t-ide-analogue-treatment-for-adult-patients-with-hbeag-positive-chronic-infection-with-genotype-c-hepatitis-b-virus-a-nationwide-real-life-study
#6
Young Chang, Won Hyeok Choe, Dong Hyun Sinn, Jeong-Hoon Lee, Sang Hoon Ahn, Hyewon Lee, Jae-Jun Shim, Dae Won Jun, Soo Young Park, Joon Yeul Nam, Eun Ju Cho, Su Jong Yu, Dong Ho Lee, Jeong Min Lee, Yoon Jun Kim, So Young Kwon, Seung Woon Paik, Jung-Hwan Yoon
Background/Aim: Antiviral treatment for patients in HBeAg-positive chronic hepatitis B virus (HBV) infection is still controversial. We assessed whether antiviral treatment reduces liver disease progression in those patients. Methods: This study included consecutive patients that tested positive for HBeAg with an HBV DNA >20,000 IU/mL, ALT <40 IU/L and without evidence of cirrhosis in eight large-volume hospitals in Korea. The primary endpoint was the development of hepatocellular carcinoma (HCC) and the secondary endpoint was the development of cirrhosis...
September 23, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/29029095/identification-of-novel-bifunctional-hiv-1-reverse-transcriptase-inhibitors
#7
Ming-Tain Lai, Paul Tawa, Anick Auger, Deping Wang, Hua-Poo Su, Youwei Yan, Daria J Hazuda, Michael D Miller, Ernest Asante-Appiah, Roman A Melnyk
Objectives: The increasing prevalence of mutations in HIV-1 reverse transcriptase (RT) that confer resistance to existing NRTIs and NNRTIs underscores the need to develop RT inhibitors with novel mode-of-inhibition and distinct resistance profiles. Methods: Biochemical assays were employed to identify inhibitors of RT activity and characterize their mode of inhibition. The antiviral activity of the inhibitors was assessed by cell-based assays using laboratory HIV-1 isolates and MT4 cells...
September 26, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/29028839/interaction-of-the-human-respiratory-syncytial-virus-matrix-protein-with-cellular-adaptor-protein-complex-3-plays-a-critical-role-in-trafficking
#8
Casey Ward, Maciej Maselko, Christopher Lupfer, Meagan Prescott, Manoj K Pastey
Human Respiratory Syncytial Virus (HRSV) is a leading cause of bronchopneumonia in infants and the elderly. To date, knowledge of viral and host protein interactions within HRSV is limited and are critical areas of research. Here, we show that HRSV Matrix (M) protein interacts with the cellular adaptor protein complex 3 specifically via its medium subunit (AP-3Mu3A). This novel protein-protein interaction was first detected via yeast-two hybrid screen and was further confirmed in a mammalian system by immunofluorescence colocalization and co-immunoprecipitation...
2017: PloS One
https://www.readbyqxmd.com/read/29028587/chemical-constituents-and-medical-benefits-of-plantago-major
#9
REVIEW
Muhammad Bahrain Adom, Muhammad Taher, Muhammad Fathiy Mutalabisin, Mohamad Shahreen Amri, Muhammad Badri Abdul Kudos, Mohd Wan Azizi Wan Sulaiman, Pinaki Sengupta, Deny Susanti
The medicinal benefits of Plantago major have been acknowledged around the world for hundreds of years. This plant contains a number of effective chemical constituents including flavonoids, alkaloids, terpenoids, phenolic acid derivatives, iridoid glycosides, fatty acids, polysaccharides and vitamins which contribute to its exerting specific therapeutic effects. Correspondingly, studies have found that Plantago major is effective as a wound healer, as well as an antiulcerative, antidiabetic, antidiarrhoeal, anti-inflammatory, antinociceptive, antibacterial, and antiviral agent...
October 10, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/29028528/inhibitors-of-yellow-fever-virus-replication-based-on-1-3-5-triphenyl-4-5-dihydropyrazole-scaffold-design-synthesis-and-antiviral-evaluation
#10
Rossella Fioravanti, Nicoletta Desideri, Antonio Carta, Elena Maria Atzori, Ilenia Delogu, Gabriella Collu, Roberta Loddo
By the antiviral screening of an in house library of pyrazoline compounds, 4-(3-(4-phenoxyphenyl)-5-phenyl-4,5-dihydro-1H-pyrazol-1-yl)benzenesulfonamide (5a) was identified as a promising hit compound for the development of anti- Yellow Fever Virus (YFV) agents. Structural optimization studies were focused on the development of 5a analogues which retain the potency as YFV inhibitors and show a reduced cytotoxicity. The synthesized 1-3,5-triphenyl-pyrazolines (4a-j, 5a-j, 6a-j) were evaluated in cell based assays for cytotoxicity and antiviral activity against representative viruses of two of the three genera of the Flaviviridae family, i...
September 28, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29028477/modulation-of-the-nf-%C3%AE%C2%BAb-signaling-pathway-by-the-hiv-2-envelope-glycoprotein-and-its-incomplete-bst-2-antagonism
#11
François E Dufrasne, Mara Lucchetti, Anandi Martin, Emmanuel André, Géraldine Dessilly, Benoit Kabamba, Patrick Goubau, Jean Ruelle
The HIVs have evolved by selecting means to hijack numerous host cellular factors. HIVs exploit the transcription factor NF-κB to ensure efficient LTR-driven gene transcription. However, NF-κB is primarily known to act as a key regulator of the proinflammatory and antiviral responses. Interestingly, retroviruses activate NF-κB during early stages of infection to initiate proviral genome expression while suppressing it at later stages to restrain expression of antiviral genes. During HIV-1 infection, diverse viral proteins such as Env, Nef and Vpr have been proposed to activate NF-κB activity, whereas Vpu has been shown to inhibit NF-κB activation...
October 10, 2017: Virology
https://www.readbyqxmd.com/read/29028165/executive-summary-of-the-6th-meeting-of-the-who-expert-working-group-of-the-gisrs-for-surveillance-of-antiviral-susceptibility
#12
(no author information available yet)
No abstract text is available yet for this article.
October 13, 2017: Relevé épidémiologique Hebdomadaire
https://www.readbyqxmd.com/read/29027107/viral-factors-for-hbv-mother-to-child-transmission
#13
James S Park, Calvin Q Pan
Chronic hepatitis B virus (HBV) remains a leading cause of cirrhosis and hepatocellular carcinoma worldwide. Because chronic hepatitis B infection is rarely eradicated, preventing mother-to-child transmission (MTCT) is the most effective strategy to eliminate HBV globally. Although immunoprophylaxis strategy is widely available and effective for infants born to mothers with chronic hepatitis B infection, postnatal immunoprophylaxis fails in approximately 5-10 % of infants, and this failure rate goes up to 30 % in infants born to highly viremic mothers...
October 12, 2017: Hepatology International
https://www.readbyqxmd.com/read/29026473/hepatitis-c-genotypes-in-libya-correlation-with-patients-characteristics-level-of-viremia-and-degree-of-liver-fibrosis
#14
Abdel-Naser Elzuoki, Islam Elzouki, Sabah Albarassi, Mohamed Gammo, Abdalla Burwaiss
OBJECTIVES: Our study sought to determine the distribution of hepatitis C virus (HCV)-genotypes among patients attending two tertiary care hospitals in Benghazi and Tripoli, Libya, and correlate this with patient's characteristics, viral load, and degree of fibrosis. METHODS: We conducted a retrospective study of 286 HCV-RNA positive Libyan patients referred from different health care facilities in east and west Libya for specific HCV treatment. HCV genotyping was carried out by gene amplification...
September 2017: Oman Medical Journal
https://www.readbyqxmd.com/read/29026137/opiate-use-inhibits-tlr9-signaling-pathway-in-vivo-possible-role-in-pathogenesis-of-hiv-1-infection
#15
Yanyan Liao, Junjun Jiang, Bingyu Liang, Fumei Wei, Jiegang Huang, Peijiang Pan, Jinming Su, Bo Zhou, Ning Zang, Li Ye, Hao Liang
The molecular mechanism of opiate use promoting HIV-1 infection is not fully understood. TLR9 is expressed in many immune cells, including monocytes, macrophages, which can recognize viruses and viral products and consequently induce the production of antiviral factors and initiate immune responses. Previous studies have shown that chronic viral infections can overcome and impair TLR9 pathway. We aimed to explore whether opiate use enhances HIV infection through inhibition of TLR9 pathway via a population-based study...
October 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29026122/nanoparticulate-vacuolar-atpase-blocker-exhibits-potent-host-targeted-antiviral-activity-against-feline-coronavirus
#16
Che-Ming Jack Hu, Wei-Shan Chang, Zih-Syun Fang, You-Ting Chen, Wen-Lin Wang, Hsiao-Han Tsai, Ling-Ling Chueh, Tomomi Takano, Tsutomu Hohdatsu, Hui-Wen Chen
Feline infectious peritonitis (FIP), caused by a mutated feline coronavirus, is one of the most serious and fatal viral diseases in cats. The disease remains incurable, and there is no effective vaccine available. In light of the pathogenic mechanism of feline coronavirus that relies on endosomal acidification for cytoplasmic entry, a novel vacuolar ATPase blocker, diphyllin, and its nanoformulation are herein investigated for their antiviral activity against the type II feline infectious peritonitis virus (FIPV)...
October 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29025787/a-markov-analysis-of-screening-for-late-onset-cytomegalovirus-disease-in-cytomegalovirus-high-risk-kidney-transplant-recipients
#17
Chethan M Puttarajappa, Sundaram Hariharan, Kenneth J Smith
BACKGROUND AND OBJECTIVES: Management strategies are unclear for late-onset cytomegalovirus infection occurring beyond 6 months of antiviral prophylaxis in cytomegalovirus high-risk (cytomegalovirus IgG positive to cytomegalovirus IgG negative) kidney transplant recipients. Hybrid strategies (prophylaxis followed by screening) have been investigated but with inconclusive results. There are clinical and potential cost benefits of preventing cytomegalovirus-related hospitalizations and associated increased risks of patient and graft failure...
October 12, 2017: Clinical Journal of the American Society of Nephrology: CJASN
https://www.readbyqxmd.com/read/29025433/the-role-of-the-glycosyl-moiety-of-myricetin-derivatives-in-anti-hiv-1-activity-in-vitro
#18
Joseph T Ortega, Alirica I Suárez, Maria L Serrano, Jani Baptista, Flor H Pujol, Hector R Rangel
BACKGROUND: Plant extracts are sources of valuable compounds with biological activity, especially for the anti-proliferative activity against pathogens or tumor cells. Myricetin is a flavonoid found in several plants that has been described as an inhibitor of Human immunodeficiency virus type 1 (HIV-1) through its action against the HIV reverse transcriptase, but myricetin derivatives have not been fully studied. The aim of this study was to evaluate the anti-HIV-1 activity of glycosylated metabolites obtained from Marcetia taxifolia and derived from myricetin: myricetin rhamnoside and myricetin 3-(6-rhamnosylgalactoside)...
October 12, 2017: AIDS Research and Therapy
https://www.readbyqxmd.com/read/29024766/protective-effect-of-an-alpha-7-nicotinic-acetylcholine-receptor-agonist-against-enterovirus-71-infection-in-neuronal-cells
#19
FengXia Song, LinQin Zhao, RuNan Zhu, QinWei Song, Jie Deng, Run Tian, Fang Wang, Yuan Qian
Enterovirus 71, as one of the dominant pathogens associated with severe hand, foot, and mouth disease, has been well reported to trigger severe neurological symptoms among young children over the last decade, particularly among children in the Asia-Pacific region. To date, no effective antiviral agent has been developed for the treatment of severe enterovirus 71 infection. PNU-282987, a selective alpha 7 nicotinic acetylcholine receptor (α7nAChR) agonist, has been reported to have a neuroprotective effect by participating in inflammatory regulation in previous studies...
October 9, 2017: Antiviral Research
https://www.readbyqxmd.com/read/29024765/identification-of-2-deoxy-2-fluorocytidine-as-a-potent-inhibitor-of-crimean-congo-hemorrhagic-fever-virus-replication-using-a-recombinant-fluorescent-reporter-virus
#20
Stephen R Welch, Florine E M Scholte, Mike Flint, Payel Chatterjee, Stuart T Nichol, Éric Bergeron, Christina F Spiropoulou
Crimean-Congo hemorrhagic fever virus (CCHFV), a tick-borne orthonairovirus, causes a severe hemorrhagic disease in humans (Crimean-Congo hemorrhagic fever, CCHF). Currently, no vaccines are approved to prevent CCHF; treatment is limited to supportive care and the use of ribavirin, the therapeutic benefits of which remain unclear. CCHF is part of WHO's priority list of infectious diseases warranting further research and development. To aid in the identification of new antiviral compounds, we generated a recombinant CCHFV expressing a reporter protein, allowing us to quantify virus inhibition by measuring the reduction in fluorescence in infected cells treated with candidate compounds...
October 9, 2017: Antiviral Research
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