scholarly journals Metabolic Remodeling during Long-Lasting Cultivation of the Endomyces magnusii Yeast on Oxidative and Fermentative Substrates

2020 ◽  
Vol 8 (1) ◽  
pp. 91
Author(s):  
Elena P. Isakova ◽  
Irina N. Matushkina ◽  
Tatyana N. Popova ◽  
Darya I. Dergacheva ◽  
Natalya N. Gessler ◽  
...  
Keyword(s):  
Reduced Glutathione ◽  
Yeast Cells ◽  
Superoxide Dismutases ◽  
Antioxidant Systems ◽  
Growth Stages ◽  
Reactive Oxidative Species ◽  
Glutathione System ◽  
Metabolic Remodeling ◽  
Endomyces Magnusii ◽  
Oxidative Species

In this study, we evaluated the metabolic profile of the aerobic microorganism of Endomyces magnusii with a complete respiration chain and well-developed mitochondria system during long-lasting cultivation. The yeast was grown in batches using glycerol and glucose as the sole carbon source for a week. The profile included the cellular biological and chemical parameters, which determined the redox status of the yeast cells. We studied the activities of the antioxidant systems (catalases and superoxide dismutases), glutathione system enzymes (glutathione peroxidase and reductase), aconitase, as well as the main enzymes maintaining NADPH levels in the cells (glucose-6-phosphate dehydrogenase and NADP+-isocitrate dehydrogenase) during aging of Endomyces magnusii on two kinds of substrates. We also investigated the dynamics of change in oxidized and reduced glutathione, conjugated dienes, and reactive oxidative species in the cells at different growth stages, including the deep stationary stages. Our results revealed a similar trend in the changes in the activity of all the enzymes tested, which increased 2–4-fold upon aging. The yeast cytosol had a very high reduced glutathione content, 22 times than that of Saccharomyces cerevisiae, and remained unchanged during growth, whereas there was a 7.5-fold increase in the reduced glutathione-to-oxidized glutathione ratio. The much higher level of reactive oxidative species was observed in the cells in the late and deep stationary phases, especially in the cells using glycerol. Cell aging of the culture grown on glycerol, which promotes active oxidative phosphorylation in the mitochondria, facilitated the functioning of powerful antioxidant systems (catalases, superoxide dismutases, and glutathione system enzymes) induced by reactive oxidative species. Moreover, it stimulated NADPH synthesis, regulating the cytosolic reduced glutathione level, which in turn determines the redox potential of the yeast cell during the early aging process.

scholarly journals Glucose Signaling Pathway and Growth Conditions Regulate Gene Expression in Retrotransposon Ty2

2009 ◽  
Vol 64 (7-8) ◽  
pp. 526-532 ◽  
Author(s):  
Sezai Türkel ◽  
Özgür Bayram ◽  
Elif Arık
Keyword(s):  
Gene Expression ◽  
Growth Conditions ◽  
Glucose Sensors ◽  
Yeast Cells ◽  
Growth Stages ◽  
Regulate Gene Expression ◽  
Glucose Signaling ◽  
Yeast Cultures ◽  
Membrane Bound ◽  
High Level

Gene expression in the yeast retrotransposon Ty2 is regulated at transcriptional and translational levels. In this study, we have shown that the transcription of Ty2 is partially dependent on the membrane-bound glucose sensors Gpr1p and Mth1p in Saccharomyces cerevisiae. Transcription of Ty2 decreased approx. 3-fold in the gpr1, mth1 yeast mutant. Moreover, our results revealed that the transcription of Ty2 fluctuates during the growth stages of S. cerevisae. Both transcription and the frameshift rate of Ty2 rapidly dropped when the stationary stage yeast cells were inoculated into fresh medium. There was an instant activation of Ty2 transcription and a high level expression during the entire logarithmic stage of yeast growth. However, the transcription of Ty2 decreased 2-fold when the yeast cultures entered the stationary stage. The frameshift rate in Ty2 also varied depending on the growth conditions. The highest frameshift level was observed during the mid-logarithmic stage. It decreased up to 2-fold during the stationary stage. Furthermore, we have found that the frameshift rate of Ty2 diminished at least 5-fold in slowly growing yeasts. These results indicate that the transcription and the frameshift efficiency are coordinately regulated in the retrotransposon Ty2 depending on the growth conditions of S. cerevisiae.

A look at photodynamic inactivation as a tool for pests and vector-borne diseases control

2022 ◽  
Vol 19 (2) ◽  
pp. 025601
Author(s):  
Alessandra R Lima ◽  
Lucas D Dias ◽  
Matheus Garbuio ◽  
Natalia M Inada ◽  
Vanderlei S Bagnato
Keyword(s):  
Public Health ◽  
Low Cost ◽  
Reactive Oxidative Species ◽  
Photodynamic Inactivation ◽  
Health Issues ◽  
Vector Borne Diseases ◽  
Control Techniques ◽  
The Past ◽  
Vector Borne ◽  
Oxidative Species

Abstract The control of pests and vector-borne diseases (VDBs) are considered public health issues Worldwide. Among the control techniques and pesticides used so far, photodynamic inactivation (PDI) has been shown as an eco-friendly, low cost, and efficient approach to eliminate pests and VDBs. PDI is characterized using a photosensitizing molecule, light and molecular oxygen (O2) resulting in production of reactive oxidative species which can promote the oxidation of biomolecules on pests and vectors. Herein, we review the past 51 years (1970–2021) regarding the use of photo pesticides, reporting the most important parameters for the protocol applied, the results obtained, and limitations. Moreover, we described the mechanism of action of the PDI, main classes of photopesticides used so far as well as the cell death mechanism resulting from the photodynamic action.

Abstract 14853: Acute Inhibition of Mitochondrial Reactive Oxidative Species Improves Endothelial SK Channel Function Following Cardioplegic Hypoxia/Reperfusion and Diabetes

Circulation ◽  
2020 ◽  
Vol 142 (Suppl_3) ◽  
Author(s):  
Yi Song ◽  
Zhiqi Zhang ◽  
Hang Xing ◽  
Yixin He ◽  
guangbin shi ◽  
...  
Keyword(s):  
Endothelial Cells ◽  
Coronary Arteries ◽  
Ischemia Reperfusion ◽  
Mouse Heart ◽  
Reactive Oxidative Species ◽  
Sk Channels ◽  
Sk Channel ◽  
Relaxation Responses ◽  
Oxidative Species ◽  
Coronary Relaxation

Introduction: Cardioplegic-ischemia/reperfusion (CP-I/R) and diabetes mellitus (DM) are correlated with coronary endothelial dysfunction and inactivated small conductance calcium-activated-potassium (SK) channels. Increased reactive oxidative species (ROS), such as mitochondrial ROS (mROS) may contribute to oxidative injury. Thus, we hypothesized that inhibition of mROS may protect coronary SK channels and endothelial function against CP-I/R-induced injury. Objective: A cardioplegic hypoxia and reoxygenation (CP-H/R) model consisting of coronary endothelial cells and small coronary arteries with or without DM were employed for examining whether MT could protect against coronary endothelial and SK channel dysfunction. Methods: Small coronary arteries (<150μm) and endothelial cells (MHECs) were dissected from the mouse heart with non-diabetes (ND) and DM (n=6/group). The microvessels or MHECs were subjected to hypoxia with cardioplegia and re-oxygenated. The microvessels or MHECs were treated with or without MT (10 -5 M) 5-minutes before and during CP-hypoxia. Microvascular vasodilation function was assessed in vitro by administration of vasoconstrictor, then ADP or NS309,respectively. K + currents of MHECs were measured by whole-cell patch clamp. The levels of endothelial mROS was measured by MitoSox TM . Results: CP-H/R significantly attenuated endothelial SK channels activity and the coronary relaxation responses to ADP and NS309 in the ND and DM groups. Treatment with MT enhanced coronary relaxation responses to ADP or NS309 ( p <0.05, Fig 1. A, B), and similar findings were seen in endothelial SK channel currents in both ND and DM MHECs ( p <0.05, Fig 1. C-F). In addition, treating MHECs with MT reduced CP-H/R-induced mROS in ND and DM groups. Conclusions: Administration of MT improves endothelial SK channels activity which may contribute to its enhancement of endothelium-dependent vasorelaxation following CP-H/R.

Melatonin protects spermatogonia from the stress of chemotherapy and oxidation via eliminating reactive oxidative species

2019 ◽  
Vol 137 ◽  
pp. 74-86 ◽  
Author(s):  
Xiaoyu Zhang ◽  
Qin Xia ◽  
Rui Wei ◽  
Hongfei Song ◽  
Jiaqi Mi ◽  
...  
Keyword(s):  
Reactive Oxidative Species ◽  
Oxidative Species

scholarly journals Zn2+ leakage and photo-induced reactive oxidative species do not explain the full toxicity of ZnO core Quantum Dots

2020 ◽  
Vol 396 ◽  
pp. 122616 ◽  
Author(s):  
Xavier Bellanger ◽  
Raphaël Schneider ◽  
Clément Dezanet ◽  
Boussad Arroua ◽  
Lavinia Balan ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Reactive Oxidative Species ◽  
Oxidative Species

Glutathione system in the blood of gastric cancer patients with various tumor histotypes and prevalence of the disease.

2020 ◽  
Vol 38 (15_suppl) ◽  
pp. e16534-e16534
Author(s):  
Irina A. Goroshinskaya ◽  
Ekaterina I. Surikova ◽  
Elena M. Frantsiyants ◽  
Ludmila A. Nemashkalova ◽  
Polina S. Kachesova ◽  
...  
Keyword(s):  
Gastric Cancer ◽  
Red Blood Cells ◽  
Blood Cells ◽  
Glutathione Transferase ◽  
Reduced Glutathione ◽  
Reductase Activity ◽  
Cell Cancer ◽  
Low Grade ◽  
Glutathione System ◽  
Incidence And Mortality

e16534 Background: The role of oxidative stress in tumor growth and the multifaceted functional significance of glutathione have led to an interest in studying the components of the glutathione-dependent system in gastric cancer (GC), which occupies a leading position in cancer incidence and mortality. The aim of this work was to study the functioning of the glutathione system in the red blood cells of patients with gastric cancer in a comparative aspect depending on the histotype of the tumor and the prevalence of the disease. Methods: The study included 89 patients with GC divided into 6 groups depending on the histotype of the tumor. Separately, the results of the study were analyzed in patients with T4 status according to TNM and in patients with stage IV cancer. The content of reduced glutathione and the activity of glutathione-dependent enzymes were studied by conventional spectrophotometric methods in the red blood cells of patients. Statistical processing of the results was performed using the Statistika 6.0 program with Student’s t-test for two independent groups. Results: An increase in the content of glutathione in patients with GC compared with the group without oncopathology was revealed. The maximum increase was observed in patients with low-grade adenocarcinoma - by 42.5%, while in signet ring cell cancer (SRCC) there was only a tendency to increase by 17.8%. Glutathione reductase activity was reduced in adenocarcinoma by 23.4-26.2% and did not change in SRCC. The activity of the antioxidant enzymes glutathione peroxidase and glutathione transferase was increased in all groups and especially in SRCC - by 76% and 23-29%, respectively. In patients with T4 status and at stage 4 of the process, lower activity of the studied glutathione-dependent enzymes was revealed compared with all other groups of patients. Conclusions: The data indicate a greater functional potential of the glutathione system in SRCC. A significant increase in the activity of glutathione transferase with a sufficiently high level of reduced glutathione contributes to the development of treatment resistance in patients with SRCC.

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