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https://www.readbyqxmd.com/read/28934455/drug-susceptibility-evaluation-of-an-influenza-a-h7n9-virus-by-analyzing-recombinant-neuraminidase-proteins
#1
Larisa V Gubareva, Katrina Sleeman, Zhu Guo, Hua Yang, Erin Hodges, Charles T Davis, Tatiana Baranovich, James Stevens
Background: Neuraminidase (NA) inhibitors are the recommended antiviral medications for influenza treatment. However, their therapeutic efficacy can be compromised by NA changes that emerge naturally and/or following antiviral treatment. Knowledge of which molecular changes confer drug resistance of influenza A(H7N9) viruses (group 2NA) remains sparse. Methods: Fourteen amino acid substitutions were introduced into the NA of A/Shanghai/2/2013(H7N9). Recombinant N9 (recN9) proteins were expressed in a baculovirus system in insect cells and tested using the Centers for Disease Control and Prevention standardized NA inhibition (NI) assay with oseltamivir, zanamivir, peramivir, and laninamivir...
September 15, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28931216/emergence-of-oseltamivir-resistant-h7n9-influenza-viruses-in-immunosuppressed-cynomolgus-macaques
#2
Maki Kiso, Kiyoko Iwatsuki-Horimoto, Seiya Yamayoshi, Ryuta Uraki, Mutsumi Ito, Noriko Nakajima, Shinya Yamada, Masaki Imai, Eiryo Kawakami, Yuriko Tomita, Satoshi Fukuyama, Yasushi Itoh, Kazumasa Ogasawara, Tiago J S Lopes, Tokiko Watanabe, Louise H Moncla, Hideki Hasegawa, Thomas C Friedrich, Gabriele Neumann, Yoshihiro Kawaoka
Antiviral compounds (eg, the neuraminidase inhibitor oseltamivir) are invaluable for the treatment of individuals infected with influenza A viruses of the H7N9 subtype (A[H7N9]), which have infected and killed hundreds of persons. However, oseltamivir treatment often leads to the emergence of resistant viruses in immunocompromised individuals. To better understand the emergence and properties of oseltamivir-resistant A(H7N9) viruses in immunosuppressed individuals, we infected immunosuppressed cynomolgus macaques with an A(H7N9) virus and treated them with oseltamivir...
September 1, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28903411/efficacy-and-safety-of-re-du-ning-injection-in-the-treatment-of-seasonal-influenza-results-from-a-randomized-double-blinded-multicenter-oseltamivir-controlled-trial
#3
Yu Liu, Wei Mu, Wei Xiao, Bao-Lin Wei, Lan Wang, Xin-Qiao Liu, Xu-Dong Xiong, Xiao-Min Huang, Ye-Qing Zhang, Hai-Ming Chen, Feng-Jie Yan, Yu-Ping Tan, Yu-Hong Huang
OBJECTIVE: To assess the efficacy and safety of RDNI in the treatment of seasonal influenza. RESULTS: 1575 participants were screened and 229 completed the study and had a RT-PCR laboratory confirmation of influenza virus infection. Fever alleviation time was 2 and 6 hours, and fever clearance time was 27 and 47 in RDNI and oseltamivir, with significant difference between two groups. Total scores of influenza symptoms descended more in RDNI than oseltamivir on day 2 and day 3...
August 15, 2017: Oncotarget
https://www.readbyqxmd.com/read/28902408/inhibition-of-influenza-virus-replication-by-adlay-tea
#4
Emiko Nagai, Miwa Iwai, Ritsuko Koketsu, Riho Sogabe, Ryosuke Morimoto, Yuri Suzuki, Yoichiro Ohta, Yoshinobu Okuno, Atsushi Ohshima, Toshiki Enomoto, Yuji Isegawa
BACKGROUND: This study was conducted to examine the antiviral activity of adlay tea and its components against influenza viruses. We further sought to clarify the mechanism by which these components regulate virus replication. RESULTS: Adlay tea at a concentration suitable for drinking inhibited the multiplication of influenza viruses. Moreover, our results suggested that individual components of the tea had antiviral activities against the influenza A/PR/8/34 virus...
September 13, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28899847/enhancing-seasonal-influenza-surveillance-topic-analysis-of-widely-used-medicinal-drugs-using-twitter-data
#5
Ireneus Kagashe, Zhijun Yan, Imran Suheryani
BACKGROUND: Uptake of medicinal drugs (preventive or treatment) is among the approaches used to control disease outbreaks, and therefore, it is of vital importance to be aware of the counts or frequencies of most commonly used drugs and trending topics about these drugs from consumers for successful implementation of control measures. Traditional survey methods would have accomplished this study, but they are too costly in terms of resources needed, and they are subject to social desirability bias for topics discovery...
September 12, 2017: Journal of Medical Internet Research
https://www.readbyqxmd.com/read/28899310/influenza-viruses-received-and-tested-by-the-melbourne-who-collaborating-centre-for-reference-and-research-on-influenza-annual-report-2015
#6
Vivian K Leung, Natalie Spirason, Hilda Lau, Iwona Buettner, Sook-Kwan Leang, Michelle K Chow
As part of its role in the World Health Organization's (WHO) Global Influenza Surveillance and Response System, the WHO Collaborating Centre for Reference and Research on Influenza in Melbourne received a total of 5,557 influenza positive samples during 2015. Viruses were analysed for their antigenic, genetic and antiviral susceptibility properties. In 2015, influenza B viruses predominated over influenza A(H1)pdm09 and A(H3) viruses, accounting for a total of 58% of all viruses analysed. The vast majority of A(H1)pdm09, A(H3) and influenza B viruses analysed at the Centre were found to be antigenically similar to the respective WHO recommended vaccine strains for the Southern Hemisphere in 2015...
June 30, 2017: Communicable Diseases Intelligence Quarterly Report
https://www.readbyqxmd.com/read/28885544/chemical-genomics-approach-leads-to-the-identification-of-hesperadin-an-aurora-b-kinase-inhibitor-as-a-broad-spectrum-influenza-antiviral
#7
Yanmei Hu, Jiantao Zhang, Rami Musharrafieh, Raymond Hau, Chunlong Ma, Jun Wang
Influenza viruses are respiratory pathogens that are responsible for annual influenza epidemics and sporadic influenza pandemics. Oseltamivir (Tamiflu(®)) is currently the only FDA-approved oral drug that is available for the prevention and treatment of influenza virus infection. However, its narrow therapeutic window, coupled with the increasing incidence of drug resistance, calls for the next generation of influenza antivirals. In this study, we discovered hesperadin, an aurora B kinase inhibitor, as a broad-spectrum influenza antiviral through forward chemical genomics screening...
September 8, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28880061/clinical-course-of-asthma-patients-with-h1n1-influenza-infection-and-oseltamivir
#8
Min-Hye Kim, Woo-Jung Song, Min-Suk Yang, So-Hee Lee, Jae-Woo Kwon, Sae-Hoon Kim, Hye-Ryun Kang, Heung-Woo Park, Young-Joo Cho, Sang-Heon Cho, Kyung-Up Min, You-Young Kim, Yoon-Seok Chang
BACKGROUND: H1N1 influenza virus prevailed throughout the world in 2009. However, there are few reports on the clinical features of H1N1 influenza infection in adult asthma patients. We evaluated the clinical features in asthma patients with H1N1 influenza infection who took oseltamivir and compared them to those with other upper respiratory infections. METHODS: We reviewed asthma patients over 15 years of age who had visited Seoul National University Hospital and Seoul National University Bundang Hospital for suspected H1N1 influenza infection from August 2009 to March 2010...
September 5, 2017: Minerva Medica
https://www.readbyqxmd.com/read/28875850/pharmacological-aspects-of-neuro-immune-interactions
#9
Vadim V Tarasov, Nikita V Kudryashov, Vladimir N Chubarev, Tatiana S Kalinina, George E Barreto, Ghulam Md Ashraf, Gjumrakch Aliev
The use of systematic approach for the analysis of mechanism of action of drugs at different levels of biological organization of organism is an important task in experimental and clinical pharmacology for drug designing and increasing the efficacy and safety of drugs. The analysis of published data on pharmacological effects of psychotropic drugs possessing immunomodulatory and/or antiviral properties have shown a correlation between central effects of examined drugs associated with the impact on the processes of neurogenesis of mature brain and survival of neurons, and their ability to alter levels of key proinflammatory cytokines...
August 29, 2017: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/28869418/a-meta-analysis-of-laninamivir-octanoate-for-treatment-and-prophylaxis-of-influenza
#10
Masayoshi Higashiguchi, Tomoshige Matsumoto, Takashi Fujii
BACKGROUND: Laninamivir octanoate is a recently developed inhaled neuraminidase inhibitor for treating influenza virus infection. We performed meta-analyses to clarify the efficacy of laninamivir octanoate on influenza treatment and prevention. METHODS: MEDLINE and CENTRAL were searched to identify eligible studies. The log median time to event ratios (logMRs) and log odds ratios (logORs) were combined with meta-analysis. RESULTS: Nine studies in treatment settings and three studies in prophylaxis settings were eligible for this meta-analysis...
September 4, 2017: Antiviral Therapy
https://www.readbyqxmd.com/read/28869231/how-a-mild-influenza-b-infection-can-kill-a-case-of-pulmonary-hemorrhage
#11
Nathalie Abi Hatem, Sabrina Campbell, Deepa Kuchelan, Jennifer Bowers, Edmundo Rubio
Viral influenza is a seasonal infection associated with significant morbidity and mortality. Rapidly fatal hemorrhagic pneumonia has been described in previously healthy individuals with β-hemolytic Streptococcus pneumoniae in a small series of patients, but it is not common in patients coinfected with influenza B and β-hemolytic Streptococcus, particularly since influenza B is considered less pathogenic than influenza A. However, despite being uncommon, this coinfection seems to be associated with high morbidity and mortality, particularly in healthy individuals...
September 2017: Lung India: Official Organ of Indian Chest Society
https://www.readbyqxmd.com/read/28859039/clinical-profile-and-outcome-of-influenza-a-h1n1-in-pediatric-oncology-patients-during-the-2015-outbreak-a-single-center-experience-from-northern-india
#12
Nishant Verma, Vishal Pooniya, Archana Kumar
BACKGROUND: Owing to their immunocompromised status, childhood cancer patients on chemotherapy are at a greater risk for Influenza infection and its associated complications. There is limited data available on the clinical profile and outcome of Influenza A/H1N1 in this subset of patients. METHODS: A retrospective study was performed of Influenza A/H1N1 cases diagnosed between January 2015 to December 2015 in the in-patients of Pediatric Oncology unit of a tertiary care hospital from Northern India...
August 30, 2017: Journal of Pediatric Hematology/oncology
https://www.readbyqxmd.com/read/28854600/the-combined-effect-of-oseltamivir-and-favipiravir-on-influenza-a-virus-evolution
#13
Louise Ormond, Ping Liu, Sebastian Matuszewski, Nicholas Renzette, Claudia Bank, Konstantin Zeldovich, Daniel N Bolon, Timothy F Kowalik, Robert W Finberg, Jeffrey D Jensen, Jennifer P Wang
Influenza virus inflicts a heavy death toll annually and resistance to existing antiviral drugs has generated interest in the development of agents with novel mechanisms of action. Favipiravir is an antiviral drug that acts by increasing the genome-wide mutation rate of influenza A virus (IAV). Potential synergistic benefits of combining oseltamivir and favipiravir have been demonstrated in animal models of influenza, but the population-level effects of combining the drugs are unknown. In order to elucidate the underlying evolutionary processes at play, we performed genome-wide sequencing of IAV experimental populations subjected to serial passaging in vitro under a combined protocol of oseltamivir and favipiravir...
July 1, 2017: Genome Biology and Evolution
https://www.readbyqxmd.com/read/28852683/successful-treatment-of-influenza-associated-acute-necrotizing-encephalitis-in-an-adult-using-high-dose-oseltamivir-and-methylprednisolone-case-report-and-literature-review
#14
REVIEW
Ahmed Alsolami, Kevin Shiley
A case of influenza-associated acute necrotizing encephalitis (ANE) is described in an otherwise healthy adult. The patient was treated successfully with a combination of high-dose methylprednisolone and high-dose oseltamivir. The patient relapsed after discontinuing 150 mg twice daily oseltamivir but quickly improved and eventually recovered after reinitiation of high-dose oseltamivir for an additional 2 weeks. The clinical presentation, pathogenesis, and treatment of influenza-associated ANE is reviewed. The use of high-dose oseltamivir in combination with methylprednisolone may offer additional therapeutic benefit for this rare and poorly understood complication of influenza infection...
2017: Open Forum Infectious Diseases
https://www.readbyqxmd.com/read/28852674/a-review-of-clinical-influenza-a-and-b-infections-with-reduced-susceptibility-to-both-oseltamivir-and-zanamivir
#15
REVIEW
Yacine Abed, Guy Boivin
Anti-influenza drugs play major roles in the management of severe influenza infections. Neuraminidase inhibitors (NAIs), which are active against all influenza A subtypes and the 2 major influenza B lineages, constitute the only class of antivirals recommended for the control of influenza epidemics and eventual pandemics. Thus, the emergence of NAI resistance could be a major clinical concern. Although most currently circulating influenza A and B strains are susceptible to NAIs, clinical cases of influenza viruses harboring single or multiple NA substitutions or deletions conferring a cross-resistance phenotype to the 2 main NAIs (oseltamivir and zanamivir) have been reported, mostly in immunocompromised individuals...
2017: Open Forum Infectious Diseases
https://www.readbyqxmd.com/read/28827718/broadly-protective-murine-monoclonal-antibodies-against-influenza-b-virus-target-highly-conserved-neuraminidase-epitopes
#16
Teddy John Wohlbold, Kira A Podolsky, Veronika Chromikova, Ericka Kirkpatrick, Veronica Falconieri, Philip Meade, Fatima Amanat, Jessica Tan, Benjamin R tenOever, Gene S Tan, Sriram Subramaniam, Peter Palese, Florian Krammer
A substantial proportion of influenza-related childhood deaths are due to infection with influenza B viruses, which co-circulate in the human population as two antigenically distinct lineages defined by the immunodominant receptor binding protein, haemagglutinin. While broadly cross-reactive, protective monoclonal antibodies against the haemagglutinin of influenza B viruses have been described, none targeting the neuraminidase, the second most abundant viral glycoprotein, have been reported. Here, we analyse a panel of five murine anti-neuraminidase monoclonal antibodies that demonstrate broad binding, neuraminidase inhibition, in vitro antibody-dependent cell-mediated cytotoxicity and in vivo protection against influenza B viruses belonging to both haemagglutinin lineages and spanning over 70 years of antigenic drift...
August 21, 2017: Nature Microbiology
https://www.readbyqxmd.com/read/28820938/multi-scale-simulation-of-receptor-drug-association-kinetics-application-to-neuramidase-inhibitors
#17
Fabian Zeller, Manuel P Luitz, Rainer Bomblies, Martin Zacharias
A detailed understanding of the drug-receptor association process is of fundamental importance for drug design. Due to the long timescales of typical binding kinetics, the atomistic simulation of the ligand traveling from bulk solution into the binding site is still computationally challenging. In this work, we apply a multi-scale approach of combined molecular dynamics (MD) and Brownian dynamics (BD) simulations to investigate association pathway ensembles for the two prominent H1N1 neuraminidase inhibitors oseltamivir and zanamivir...
August 18, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28818475/oseltamivir-use-and-severe-abnormal-behavior-in-japanese-children-and-adolescents-with-influenza-is-a-self-controlled-case-series-study-applicable
#18
Wakaba Fukushima, Kotaro Ozasa, Akihisa Okumura, Masaaki Mori, Mitsuaki Hosoya, Takashi Nakano, Takuya Tanabe, Naoto Yamaguchi, Hiroshi Suzuki, Mitsuru Mori, Hideaki Hatayama, Hirotaka Ochiai, Kyoko Kondo, Kazuya Ito, Satoko Ohfuji, Yosikazu Nakamura, Yoshio Hirota
OBJECTIVE: Since the 1990s, self-controlled designs including self-controlled case series (SCCS) studies have been occasionally used in post-marketing evaluation of drug or vaccine safety. An SCCS study was tentatively applied to evaluate the relationship between oseltamivir use and abnormal behavior Type A (serious abnormal behavior potentially leading to an accident or harm to another person) in influenza patients. METHODS: From the original prospective cohort study with approximately 10,000 Japanese children and adolescents with influenza (aged <18years), 28 subjects (mean age: 7...
August 24, 2017: Vaccine
https://www.readbyqxmd.com/read/28814832/combinatorial-and-sequential-delivery-of-gemcitabine-and-oseltamivir-phosphate-from-implantable-poly-d-l-lactic-co-glycolic-acid-cylinders-disables-human-pancreatic-cancer-cell-survival
#19
Stephanie Allison Logan, Amanda J Brissenden, Myron R Szewczuk, Ronald J Neufeld
Combination therapies against multiple targets are currently being developed to prevent resistance to a single chemotherapeutic agent and to extirpate pre-existing resistance in heterogeneous cancer cells in tumors due to selective pressure from the single agent. Gemcitabine (GEM), a chemotherapeutic agent, is the current standard of care for patients with pancreatic cancer. Patients with pancreatic cancer receiving GEM have a low progression-free survival. Given the poor response rate to GEM, cancer cells are known to develop rapid resistance to this drug...
2017: Drug Design, Development and Therapy
https://www.readbyqxmd.com/read/28814737/susceptibility-of-influenza-a-h1n1-pdm2009-seasonal-a-h3n2-and-b-viruses-to-oseltamivir-in-guangdong-china-between-2009-and-2014
#20
Shan-Shan Liu, Xiao-Yang Jiao, Sheng Wang, Wen-Zhe Su, Ling-Zhi Jiang, Xin Zhang, Chang-Wen Ke, Ping Xiong
Nasopharyngeal swabs were collected from patients through the influenza surveillance network of the CDC of Guangdong. All specimens between 2009 and 2014 were checked for influenza virus using MDCK cells and further subtyped. Of those collected, 542 H1N1pdm09, 230 A(H3N2)and 448 B viruses selected at random were subjected to fluorescence-based NAI assays. Viral RNA was extracted from resistant isolates, and their NA genes were amplified by RT-PCR. Alignment of nucleotides and amino acids was performed. We performed structural modelling and simulations of mutants using Modeller 9...
August 16, 2017: Scientific Reports
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