Journal of Microbiology

Journal Article

Comparison of anti-influenza virus activity and pharmacokinetics of oseltamivir free base and oseltamivir phosphate: Jin Soo Shin , Keun Bon Ku , Yejin Jang , Yi-Seul Yoon , Daeho Shin , Oh Seung Kwon , Yun Young Go , Seong Soon Kim , Myoung Ae Bae , Meehyein Kim; J. Microbiol. 2017;55(12):979-983. Published online December 7, 2017; DOI: https://doi.org/10.1007/s12275-017-7371-x

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Influenza viruses are major human respiratory pathogens that cause high morbidity and mortality worldwide. Currently, prophylactic vaccines and therapeutic antiviral agents are used to prevent and control influenza virus infection. Oseltamivir free base (OSV-FB), a modified generic antiviral drug of Tamiflu (oseltamivir phosphate, OSV-P), was launched in the Republic of Korea last year. Here, we examine the bioequivalence of these two compounds by assessing their antiviral efficacy in infected cells and in a mouse model. It was observed that both antivirals showed comparable efficacy against 11 different influenza A and B viruses in vitro. Moreover, in mice infected with influenza A virus (mouse-adapted A/Puerto Rico/8/34), they showed a dose-dependent therapeutic activity and alleviated infection-mediated reductions in body weight, leading to significantly better survival. There was histopathological disappearance of virus-induced inflammatory cell infiltration of the lung after oral treatment with either antiviral agent (at 10 mg/kg). Pharmacokinetic analysis also exhibited similar plasma concentrations of the active drug, oseltamivir carboxylate, metabolised from both OSVB and OSV-P. This is the first report showing bioequivalence of OSV-FB to its phosphate salt form in the mouse system. The free base drug has some beneficial points including simple drug formulation process and reduced risk of undesirable cation-phosphate precipitation within solution. The long term stability of OSV-FB requires further monitoring when it is provided as a national stock in readiness for an influenza pandemic.

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Research Support, Non-U.S. Gov'ts

Relationships between the use of Embden Meyerhof pathway (EMP) or Phosphoketolase pathway (PKP) and lactate production capabilities of diverse Lactobacillus reuteri strains: Grégoire Burgé , Claire Saulou-Bérion , Marwen Moussa , Florent Allais , Violaine Athes , Henry-Eric Spinnler; J. Microbiol. 2015;53(10):702-710. Published online October 2, 2015; DOI: https://doi.org/10.1007/s12275-015-5056-x

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Abstract

The aims of this study is to compare the growth and glucose metabolism of three Lactobacillus reuteri strains (i.e. DSM 20016, DSM 17938, and ATCC 53608) which are lactic acid bacteria of interest used for diverse applications such as probiotics implying the production of biomass, or for the production of valuable chemicals (3-hydroxypropionaldehyde, 3-hydroxypropionic acid, 1,3-propanediol). However, the physiological diversity inside the species, even for basic metabolisms, like its capacity of acidification or glucose metabolism, has not been studied yet. In the present work, the growth and metabolism of three strains representative of the species diversity have been studied in batch mode. The strains were compared through characterization of growth kinetics and evaluation of acidification kinetics, substrate consumption and product formation. The results showed significant differences between the three strains which may be explained, at least in part, by variations in the distribution of carbon source between two glycolytic pathways during the bacterial growth: the phosphoketolase or heterolactic pathway (PKP) and the Embden-Meyerhof pathway (EMP). It was also shown that, in the context of obtaining a large amount of biomass, DSM 20016 and DSM 17938 strains were the most effective in terms of growth kinetics. The DSM 17938 strain, which shows the more significant metabolic shift from EMP to PKP when the pH decreases, is more effective for lactate production.

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Yonghui Yu, Yingying Li, Jingjie Zhang, Jing Wang
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Yankai Min, Qing Zhang, Jiali Liu, Yanling Shang, Yilin Hou, Min Zhang, Jingwen Dai, Ziyu Li, Wenliang Xiang, Jie Tang
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Exploitation of microbial activities at low pH to enhance planetary health
Merve Atasoy, Avelino Álvarez Ordóñez, Adam Cenian, Aleksandra Djukić-Vuković, Peter A Lund, Fatih Ozogul, Janja Trček, Carmit Ziv, Daniela De Biase
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Salvatore Galgano, Helen Kettle, Andrew Free, Jos G. M. Houdijk, Vanni Bucci
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Stella Green, Graham T. Eyres, Dominic Agyei, Biniam Kebede
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Characterization of nuvita biosearch center (NBC) isolated lactic acid bacteria strains from human origin and determination of growth kinetic profiles of selected cultures under bioreactor
Akif Emre Kavak, İnci Zent, Ezgi Metin Sağır, Gülistan Öncü, Feride İrem Şimşek
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Kinetic Evaluation of Products Inhibition to Succinic Acid Producers Escherichia coli NZN111, AFP111, BL21, and Actinobacillus succinogenes 130ZT: Qiang Li , Dan Wang , Yong Wu , Maohua Yang , Wangliang Li , Jianmin Xing , Zhiguo Su; J. Microbiol. 2010;48(3):290-296. Published online June 23, 2010; DOI: https://doi.org/10.1007/s12275-010-9262-2

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Abstract

Succinic acid is one of the platform compounds and its production via natural feedstocks has drawn worldwide concerns. To evaluate the inhibitory effects of fermentation products on the growth of Actinobacillus succinogenes 130ZT and Escherichia coli NZN111, AFP111, BL21, fermentations with addition of individual products in medium were carried out. The cell growth was inhibited when the concentrations of formate, acetate, lactate, and succinate were at range of 8.8-17.6 g/L, 10-40 g/L, 9-18 g/L, and 10-80 g/L, respectively. For these two species of bacteria, E. coli was more resistant to acid products than A. succinogenes, while both endured succinate rather than by-products. As a result of end product inhibition, succinate production yield by A. succinogenes decreased from 1.11 to 0.49 g/g glucose. Logistic and Monod mathematical models were presented to simulate the inhibition kinetics. The Logistic model was found more suitable for describing the overall synergistic inhibitory effects.

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Physiological characterization of kinetics and action mechanism of vibrio hemolysin: Choe, Young Chool , Jeong, Ga Jin; J. Microbiol. 1995;33(4):289-294.

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Abstract: The action mechanism of hemolysin rendering virulency of Vibrio anguilarum has not clarified as yet, even though there were several possible factors explained. We have studied hemolytic kinetics performed by hemolysin from V. anguillarum strain V7 as well as binding of hemolysin to RBC membrane. Maximal rate of hemolysis and duration of lag phase were directly and inversly correlated to the concentration of hemolysin used. Hemolysin molecules are known to bind consumptively with proper diameter, while other protectants with smaller diameter could not. In conclusion, hemolysin should bind irreversibly to RBC membrane exert hemolysis distorting osmotic pressure. The binding could be hindered by spatial structure of the RBC surfacem which might be caused by sialic acid.

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