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Stefanie Quosdorf, Anja Schuetz, Herbert Kolodziej
Neuraminidaseis a key enzyme in the life cycle of influenza viruses and is present in some bacterial pathogens. We here assess the inhibitory potency of plant tannins versus clinically used inhibitors on both a viral and a bacterial model neuraminidase by applying the 2'-(4-methylumbelliferyl)-α-d-N-acetylneuraminic acid (MUNANA)-based activity assay. A range of flavan-3-ols, ellagitannins and chemically defined proanthocyanidin fractions was evaluated in comparison to oseltamivir carboxylate and zanamivir for their inhibitory activities against viral influenza A (H1N1) and bacterial Vibrio cholerae neuraminidase (VCNA)...
November 17, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
J Khoury, M Szwarcwort, Z Kra-Oz, M Saffuri, K Seh, T Yahalomi, E Braun, Z S Azzam, M Paul, A Neuberger
The purpose of this study was to determine the rate of decline in the diagnostic yield of influenza PCR assay after oseltamivir administration, and to identify risk factors for prolonged shedding. This was a prospective observational study. We included adult inpatients with clinical signs of influenza during the influenza seasons 2015 and 2016, who had positive influenza PCR tests and who were treated with oseltamivir. Clinical follow-up and repeat PCR testing were performed on days 2, 4 and 6 after the first positive test...
November 15, 2017: European Journal of Clinical Microbiology & Infectious Diseases
Zhen Wang, Li Ping Cheng, Xing Hua Zhang, Wan Pang, Liang Li, Jin Long Zhao
Neuraminidase (NA) is one of the particular potential targets for novel antiviral therapy. In this work, a series of neuraminidase inhibitors with the cyclohexene scaffold were studied based upon the combination of 3D-QSAR, molecular docking, and molecular dynamics techniques. The results indicate that the built 3D-QSAR models yield reliable statistical information: the correlation coefficient (r(2)) and cross-validation coefficient (q(2)) of CoMFA (comparative molecular field analysis) are 0.992 and 0.819; the r(2) and q(2) of CoMSIA (comparative molecular similarity analysis) are 0...
November 4, 2017: Bioorganic & Medicinal Chemistry Letters
Marie Nykvist, Anna Gillman, Hanna Söderström Lindström, Chaojun Tang, Ganna Fedorova, Åke Lundkvist, Neus Latorre-Margalef, Michelle Wille, Josef D Järhult
Neuraminidase inhibitors are a cornerstone of influenza pandemic preparedness before vaccines can be mass-produced and thus a neuraminidase inhibitor-resistant pandemic is a serious threat to public health. Earlier work has demonstrated the potential for development and persistence of oseltamivir resistance in influenza A viruses exposed to environmentally relevant water concentrations of the drug when infecting mallards, the natural influenza reservoir that serves as the genetic base for human pandemics. As zanamivir is the major second-line neuraminidase inhibitor treatment, this study aimed to assess the potential for development and persistence of zanamivir resistance in an in vivo mallard model; especially important as zanamivir will probably be increasingly used...
November 15, 2017: Journal of General Virology
(no author information available yet)
No abstract text is available yet for this article.
November 14, 2017: BMJ: British Medical Journal
Yuwei Yang, Haojie Zhong, Tie Song, Jianfeng He, Lan Guo, Xiaohua Tan, Guofeng Huang, Min Kang
OBJECTIVE: To describe the demographics and clinical characteristics of patients with A (H7N9) infection, to test the differences in the distribution of demographics and clinical characteristics by clinical severity, and to explore potential factors associated with clinical severity. METHODS: This retrospective study was conducted to collect epidemiological and clinical information regarding the confirmed cases in Guangdong through field investigation and review of medical records...
November 8, 2017: International Journal of Infectious Diseases: IJID
Tejas R Karhadkar, Darrell Pilling, Nehemiah Cox, Richard H Gomer
Fibrosis involves increasing amounts of scar tissue appearing in a tissue, but what drives this is unclear. In fibrotic lesions in human and mouse lungs, we found extensive desialylation of glycoconjugates, and upregulation of sialidases. The fibrosis-associated cytokine TGF-β1 upregulates sialidases in human airway epithelium cells, lung fibroblasts, and immune system cells. Conversely, addition of sialidases to human peripheral blood mononuclear cells induces accumulation of extracellular TGF-β1, forming what appears to be a sialidase - TGF-β1 - sialidase positive feedback loop...
November 8, 2017: Scientific Reports
Eleni Geladari, Vasilios Papademetriou, Hans Moore, David Lu
We present a 59-year-old black male with history of type-1 diabetes and alcohol abuse. Patient became critically ill after a 5-day period of burning throat discomfort. On arrival patient was lethargic, in cardiogenic shock with a blood pressure of 81/47mmHg. Immediate diagnoses included diabetic ketoacidosis, acute renal failure, and possible septic shock. He was intubated, resuscitated with intravenous fluids, maintained on three inotropic agents, and given empiric wide spectrum antibiotics. An ECG showed a new ST elevation MI and an echocardiogram showed severe LV dysfunction...
May 2, 2017: Cardiovascular Revascularization Medicine: Including Molecular Interventions
Kuanglei Wang, Fei Yang, Lihui Wang, Kemin Liu, Lu Sun, Bin Lin, Yaping Hu, Boyu Wang, Maosheng Cheng, Yongshou Tian
Neuraminidase inhibitors can deter nascent viruses from infecting intact cells by preventing their release from host cells. Herein, a neuraminidase inhibitor 11b absent of basic moieties was discovered in the process of searching for inhibitors targeting 150 cavity. It exhibited potent inhibitions against wild-type neuraminidases from group 1 (H5N1 and H1N1) and group 2 (H7N9) subtypes with IC50 values similar to those of oseltamivir carboxylate. Moreover, 11b showed moderate inhibitions against mutant neuraminidases from H5N1-H274Y and H1N1-H274Y with IC50 values of 2075 nM and 1382 nM, which were inferior to those of oseltamivir carboxylate (6095 nM and 4071 nM)...
December 1, 2017: European Journal of Medicinal Chemistry
Harshini K Ashar, Nathan C Mueller, Jennifer M Rudd, Timothy A Snider, Mallika Achanta, Maram Prasanthi, Sivasami Pulavendran, Paul G Thomas, Ramachandran Akhilesh, Jerry R Malayer, Jerry W Ritchey, Rachakatla Rajasekhar, Vincent Tk Chow, Charles T Esmon, Narasaraju Teluguakula
Although exaggerated host immune responses have been implicated in influenza-induced lung pathogenesis, the etiologic factors that contribute to these events are not completely understood. We previously demonstrated that neutrophil extracellular traps exacerbate pulmonary injury during influenza pneumonia. Histones are the major protein components of neutrophil extracellular traps and are known to have cytotoxic effects. Here, we examined the role of extracellular histones in lung pathogenesis during influenza...
October 26, 2017: American Journal of Pathology
Bindumadhav M Marathe, Heba H Mostafa, Peter Vogel, Philippe Noriel Q Pascua, Jeremy C Jones, Charles J Russell, Richard J Webby, Elena A Govorkova
Immunocompromised patients are highly susceptible to influenza virus infections. Although neuraminidase inhibitor (NAI) therapy has proved effective in these patients, the treatment regimens require optimization, which can be partly addressed via animal models. Here, we describe a pharmacologically immunosuppressed mouse model for studying the pathogenesis of influenza B viruses and evaluating the efficacy of antiviral treatment. We modeled clinical regimens for dexamethasone and cyclophosphamide to immunosuppress BALB/c mice that were then inoculated with B/Phuket/3073/2013 (Yamagata lineage) or B/Brisbane/60/2008 (BR/08, Victoria lineage) virus...
October 31, 2017: Antiviral Research
Jing Jin, Shuo Chen, Dechuan Wang, Yuanjin Chen, Yuxu Wang, Min Guo, Changlin Zhou, Jie Dou
Because it is highly contagious, the influenza A virus (IAV) has the potential to cause pandemics in humans. The emergence of drug-resistant strains requires the development of new chemical therapeutics. Oroxylin A (OA) is a flavonoid which has been shown to have antioxidant and antitumor effects. However, intensive studies in which OA fights against different influenza virus strains and the underlying antiviral mechanisms have not been reported. In our study, the antiviral activities in cells and in mice, the preliminary mechanisms of OA were investigated...
October 27, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
Shahin Yazdani, Hamed Esfandiari, Sare Safi, Alireza Fatemi
PURPOSE: To report a case of bilateral acute angle closure glaucoma after one dose of oseltamivir 75 mg. CASE REPORT: A 37-year-old man with a history of influenza developed high intraocular pressure and uniformly shallow anterior chamber in both eyes, 5 hours after the first dose of oseltamivir 75 mg. The condition was managed successfully with topical cycloplegic and systemic/topical antiglaucoma medications. CONCLUSION: Since a presumed idiosyncratic reaction developed right after the first dose of the medication, it challenges the common concept of adaptive immune system involvement in this type of reaction in medication-related ciliochoroidal effusion...
October 2017: Journal of Ophthalmic & Vision Research
Clément Fage, Véronique Tu, Julie Carbonneau, Yacine Abed, Guy Boivin
BACKGROUND: Peramivir is a parenteral neuraminidase inhibitor (NAI) approved for treating influenza infections in a few countries. We determined peramivir susceptibilities of several uncharacterized influenza A and B neuraminidase (NA) and haemagglutinin (HA) mutants selected with different NAIs. METHODS: Recombinant wild-type (WT) and mutant NA proteins were expressed in 293T cells and susceptibility to peramivir, oseltamivir and zanamivir was determined by NA inhibition assay using the MUNANA substrate...
March 22, 2017: Antiviral Therapy
Camilly P Pires de Mello, George L Drusano, Jonathan R Adams, Matthew Shudt, Robert Kulawy, Ashley N Brown
Drug-resistant influenza is a significant threat to global public health. Until new antiviral agents with novel mechanisms of action become available, there is a pressing need for alternative treatment strategies with available influenza antivirals. Our aims were to evaluate the antiviral activity of two neuraminidase inhibitors (oseltamivir and zanamivir) as combination therapy against H1N1 influenza A viruses, as these agents bind to the neuraminidase active site differently: oseltamivir requires a conformational change for binding whereas zanamivir does not...
January 1, 2018: European Journal of Pharmaceutical Sciences
Mahima Sahu, Neeru Singh, Mohan K Shukla, Varhsa A Potdar, Ravendra K Sharma, Lalit Kumar Sahare, Mahendra J Ukey, Pradip V Barde
Influenza A(H1N1)pdm09 virus pandemic struck India in 2009 and continues to cause outbreaks in its post pandemic phase. Diminutive information is available about influenza A(H1N1)pdm09 from central India. This observational study presents epidemiological and molecular findings for the period of six years. Throat swab samples referred from districts of Madhya Pradesh were subjected to diagnosis of Influenza A(H1N1)pdm09 following WHO guidelines. Clinical and epidemiological data was recorded and analysed. Hemagglutinin (HA) gene sequencing and phylogenetic analysis was performed...
October 26, 2017: Journal of Medical Virology
Qian-Qian Niu, Yu Chen, Ye Liu, Si-Zhu Mao, Hui Wang, Wen-Ke Zheng, Jun-Hua Zhang
To evaluate the efficacy and safety of Lianhua Qingwen capsule for influenza. All reports of the randomized controlled trials (RCTs) on Lianhua Qingwen capsule treating influenza were retrieved from database of CNKI, WANFANG DATA, VIP, PubMed, the Cochrane Library by February 2017. The studies were screened according to the inclusion and exclusion criteria, the data were extracted by 2 authors, the quality of the included RCTs was assessed, and meta-analysis was performed using Revman5.3 software. A total of 1 525 patients and 10 studies were included...
April 2017: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
Miguel M Leiva-Juarez, Carson T Kirkpatrick, Brian E Gilbert, Brenton Scott, Michael J Tuvim, Burton F Dickey, Scott E Evans, Diane Markesich
Influenza pneumonia remains a common and debilitating viral infection despite vaccination programs and antiviral agents developed for prophylaxis and treatment. The neuraminidase inhibitor oseltamivir is frequently prescribed for established influenza A virus infections, but the emergence of neuraminidase inhibitor resistant viruses, a brief therapeutic window and competing diagnoses complicate its use. PUL-042 is a clinical stage, aerosol drug comprised of synthetic ligands for Toll-like receptor (TLR) 2/6 and TLR 9...
October 21, 2017: European Journal of Pharmacology
Rohini K, Shanthi V
Neuraminidase (NA), a surface protein, facilitates the release of nascent virus and thus spreads infection. It has been renowned as a potential drug target for influenza A virus infection. The drugs such as oseltamivir, zanamivir, peramivir, and laninamivir are approved for the treatment of influenza infection. Additionally, investigational drugs namely MK2206, tamiphosphor, crenatoside, and dehydroepiandrosterone (DHEA) are also available for the treatment. However, recent outbreaks of highly pathogenic and drug-resistant influenza A strains highlighted the need to discover novel NA inhibitor...
October 23, 2017: Applied Biochemistry and Biotechnology
Nikolaos Andreatos, Eleftherios Mylonakis
No abstract text is available yet for this article.
October 17, 2017: Annals of Internal Medicine
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