scholarly journals Contribution of Drugs Interfering with Protein and Cell Wall Synthesis to the Persistence of Pseudomonas aeruginosa Biofilms: An In Vitro Model

2021 ◽  
Vol 22 (4) ◽  
pp. 1628
Author(s):  
Gianmarco Mangiaterra ◽  
Elisa Carotti ◽  
Salvatore Vaiasicca ◽  
Nicholas Cedraro ◽  
Barbara Citterio ◽  
...  
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Cell Wall ◽  
Bacterial Population ◽  
In Vitro Model ◽  
Biofilm Production ◽  
Lung Infections ◽  
Vitro Model ◽  
High Doses

The occurrence of Pseudomonas aeruginosa (PA) persisters, including viable but non-culturable (VBNC) forms, subpopulations of tolerant cells that can survive high antibiotic doses, is the main reason for PA lung infections failed eradication and recurrence in Cystic Fibrosis (CF) patients, subjected to life-long, cyclic antibiotic treatments. In this paper, we investigated the role of subinhibitory concentrations of different anti-pseudomonas antibiotics in the maintenance of persistent (including VBNC) PA cells in in vitro biofilms. Persisters were firstly selected by exposure to high doses of antibiotics and their abundance over time evaluated, using a combination of cultural, qPCR and flow cytometry assays. Two engineered GFP-producing PA strains were used. The obtained results demonstrated a major involvement of tobramycin and bacterial cell wall-targeting antibiotics in the resilience to starvation of VBNC forms, while the presence of ciprofloxacin and ceftazidime/avibactam lead to their complete loss. Moreover, a positive correlation between tobramycin exposure, biofilm production and c-di-GMP levels was observed. The presented data could allow a deeper understanding of bacterial population dynamics during the treatment of recurrent PA infections and provide a reliable evaluation of the real efficacy of the antibiotic treatments against the bacterial population within the CF lung.

scholarly journals A Role of Intravenous Immunoglobulin in Human Parechovirus Type 3 Infection in an In Vitro Model

2016 ◽  
Vol 3 (suppl_1) ◽  
Author(s):  
Ryohei Izumita ◽  
Yuta Aizawa ◽  
Kanako Watanabe ◽  
Akihiko Saitoh
Keyword(s):  
Intravenous Immunoglobulin ◽  
In Vitro Model ◽  
Human Parechovirus ◽  
Vitro Model ◽  
Type 3

scholarly journals Elucidation of the pharmacokinetic/pharmacodynamic determinants of fosfomycin activity against Pseudomonas aeruginosa using a dynamic in vitro model

2018 ◽  
Vol 73 (6) ◽  
pp. 1570-1578 ◽  
Author(s):  
Hajira Bilal ◽  
Anton Y Peleg ◽  
Michelle P McIntosh ◽  
Ian K Styles ◽  
Elizabeth B Hirsch ◽  
...  
Keyword(s):  
Pseudomonas Aeruginosa ◽  
In Vitro Model ◽  
Vitro Model

scholarly journals β-Naphthoflavone and Ethanol Reverse Mitochondrial Dysfunction in A Parkinsonian Model of Neurodegeneration

2020 ◽  
Vol 21 (11) ◽  
pp. 3955
Author(s):  
Jesus Fernandez-Abascal ◽  
Elda Chiaino ◽  
Maria Frosini ◽  
Gavin P. Davey ◽  
Massimo Valoti
Keyword(s):  
Complex I ◽  
In Vitro Model ◽  
Inhibitory Effects ◽  
Cyp Induction ◽  
Cyp Isoforms ◽  
Vitro Model ◽  
Complex I Activity ◽  
Cyp 2D6

The 1-methyl-4-phenylpyridinium (MPP+) is a parkinsonian-inducing toxin that promotes neurodegeneration of dopaminergic cells by directly targeting complex I of mitochondria. Recently, it was reported that some Cytochrome P450 (CYP) isoforms, such as CYP 2D6 or 2E1, may be involved in the development of this neurodegenerative disease. In order to study a possible role for CYP induction in neurorepair, we designed an in vitro model where undifferentiated neuroblastoma SH-SY5Y cells were treated with the CYP inducers β-naphthoflavone (βNF) and ethanol (EtOH) before and during exposure to the parkinsonian neurotoxin, MPP+. The toxic effect of MPP+ in cell viability was rescued with both βNF and EtOH treatments. We also report that this was due to a decrease in reactive oxygen species (ROS) production, restoration of mitochondrial fusion kinetics, and mitochondrial membrane potential. These treatments also protected complex I activity against the inhibitory effects caused by MPP+, suggesting a possible neuroprotective role for CYP inducers. These results bring new insights into the possible role of CYP isoenzymes in xenobiotic clearance and central nervous system homeostasis.

scholarly journals 2-Hydroxy-(4-methylseleno)butanoic Acid Is Used by Intestinal Caco-2 Cells as a Source of Selenium and Protects against Oxidative Stress

2019 ◽  
Vol 149 (12) ◽  
pp. 2191-2198
Author(s):  
Joan Campo-Sabariz ◽  
David Moral-Anter ◽  
M Teresa Brufau ◽  
Mickael Briens ◽  
Eric Pinloche ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
In Vitro Model ◽  
Thioredoxin Reductase ◽  
Protein Carbonyl ◽  
Butanoic Acid ◽  
H2o2 Treatment ◽  
Vitro Model ◽  
Gpx Activity

ABSTRACT Background Selenium (Se) participates in different functions in humans and other animals through its incorporation into selenoproteins as selenocysteine. Inadequate dietary Se is considered a risk factor for several chronic diseases associated with oxidative stress. Objective The role of 2-hydroxy-(4-methylseleno)butanoic acid (HMSeBA), an organic form of Se used in animal nutrition, in supporting selenoprotein synthesis and protecting against oxidative stress was investigated in an in vitro model of intestinal Caco-2 cells. Methods Glutathione peroxidase (GPX) and thioredoxin reductase (TXNRD) activities, selenoprotein P1 protein (SELENOP) and gene (SELENOP) expression, and GPX1 and GPX2 gene expression were studied in Se-deprived (FBS removal) and further HMSeBA-supplemented (0.1–625 μM, 72 h) cultures. The effect of HMSeBA supplementation (12.5 and 625 μM, 24 h) on oxidative stress induced by H2O2 (1 mM) was evaluated by the production of reactive oxygen species (ROS), 4-hydroxy-2-nonenal (4-HNE) adducts, and protein carbonyl residues compared with a sodium selenite control (SS, 5 μM). Results Se deprivation induced a reduction (P < 0.05) in GPX activity (62%), GPX1 expression, and both SELENOP (33%) and SELENOP expression. In contrast, an increase (P < 0.05) in GPX2 expression and no effect in TXNRD activity (P = 0.09) were observed. HMSeBA supplementation increased (P < 0.05) GPX activity (12.5–625 μM, 1.68–1.82-fold) and SELENOP protein expression (250 and 625 μM, 1.87- and 2.04-fold). Moreover, HMSeBA supplementation increased (P < 0.05) GPX1 (12.5 and 625 μM), GPX2 (625 μM), and SELENOP (12.5 and 625 μM) expression. HMSeBA (625 μM) was capable of decreasing (P < 0.05) ROS (32%), 4-HNE adduct (49%), and protein carbonyl residue (75%) production after H2O2 treatment. Conclusion Caco-2 cells can use HMSeBA as an Se source for selenoprotein synthesis, resulting in protection against oxidative stress.

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