Reactive oxygen species and anti-oxidant defences in swine follicular fluids

2008 ◽  
Vol 20 (2) ◽  
pp. 269 ◽  
Author(s):  
Giuseppina Basini ◽  
Bussolati Simona ◽  
Sujen Eleonora Santini ◽  
Francesca Grasselli
Keyword(s):  
Reactive Oxygen Species ◽  
Ovarian Follicle ◽  
Reactive Oxygen ◽  
Redox Status ◽  
Follicle Development ◽  
Oxygen Species ◽  
Detoxifying Enzymes ◽  
Anti Oxidant ◽  
Reduced Activity ◽  
Follicular Fluids

A growing body of evidence indicates that the pro-oxidant/anti-oxidant balance inside the ovarian follicle plays an important role in folliculogenesis. Therefore, the aim of the present study was to assess the redox status of follicular fluids collected from different-sized swine follicles. We quantified the most important reactive oxygen species (ROS), namely superoxide anion (O2–), hydrogen peroxide and hydroperoxides (ROOH); in addition, we examined the activity of the detoxifying enzymes superoxide dismutase, catalase (CAT) and glutathione peroxidase and the total non-enzymatic antioxidant capacity as determined by the ferric-reducing anti-oxidant power assay. Our data demonstrate that oxidative stress does not affect follicle growth because O2– levels do not change during follicle development, whereas concentrations of H2O2 and ROOH are reduced (P < 0.05). Surprisingly, all non-enzymatic and enzymatic scavengers examined in the present study, except for CAT, demonstrated reduced activity during follicle development (P < 0.05). Taken together, these results suggest that other factors could be involved in ROS detoxification during follicle development.

scholarly journals Reactive Oxygen Species in Host Plant Are Required for an Early Defense Response against Attack of Stagonospora nodorum Berk. Necrotrophic Effectors SnTox

Plants ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 1586
Author(s):  
Svetlana Veselova ◽  
Tatyana Nuzhnaya ◽  
Guzel Burkhanova ◽  
Sergey Rumyantsev ◽  
Igor Maksimov
Keyword(s):  
Reactive Oxygen Species ◽  
Early Stage ◽  
Reactive Oxygen ◽  
Triticum Aestivum L ◽  
Redox Status ◽  
Stagonospora Nodorum ◽  
Ros Generation ◽  
Ros Production ◽  
Oxygen Species ◽  
Necrotrophic Effectors

Reactive oxygen species (ROS) play a central role in plant immune responses. The most important virulence factors of the Stagonospora nodorum Berk. are multiple fungal necrotrophic effectors (NEs) (SnTox) that affect the redox-status and cause necrosis and/or chlorosis in wheat lines possessing dominant susceptibility genes (Snn). However, the effect of NEs on ROS generation at the early stages of infection has not been studied. We studied the early stage of infection of various wheat genotypes with S nodorum isolates -Sn4VD, SnB, and Sn9MN, carrying a different set of NE genes. Our results indicate that all three NEs of SnToxA, SnTox1, SnTox3 significantly contributed to cause disease, and the virulence of the isolates depended on their differential expression in plants (Triticum aestivum L.). The Tsn1–SnToxA, Snn1–SnTox1and Snn3–SnTox3 interactions played an important role in inhibition ROS production at the initial stage of infection. The Snn3–SnTox3 inhibited ROS production in wheat by affecting NADPH-oxidases, peroxidases, superoxide dismutase and catalase. The Tsn1–SnToxA inhibited ROS production in wheat by affecting peroxidases and catalase. The Snn1–SnTox1 inhibited the production of ROS in wheat by mainly affecting a peroxidase. Collectively, these results show that the inverse gene-for gene interactions between effector of pathogen and product of host sensitivity gene suppress the host’s own PAMP-triggered immunity pathway, resulting in NE-triggered susceptibility (NETS). These results are fundamentally changing our understanding of the development of this economical important wheat disease.

scholarly journals Efficacy of α-tocopherol administration in community-acquired pneumonia

2007 ◽  
pp. 99-102
Author(s):  
F. R. Farkhutdinov
Keyword(s):  
Reactive Oxygen Species ◽  
Whole Blood ◽  
Blood Concentration ◽  
Conventional Treatment ◽  
Clinical Course ◽  
Reactive Oxygen ◽  
Redox Status ◽  
Community Acquired Pneumonia ◽  
Oxygen Species ◽  
Laboratory Parameters

We studied effect of α tocopherol on clinical course and production of reactive oxygen species (ROS) in the whole blood in patients with community acquired pneumonia (CAP). The trial involved 70 patients with CAP. Generation of ROS was studied using the luminol dependent chemilumines cence (LDCL) method. Conventional treatment was given to all the patients. Besides this, 35 patients received α tocopherol. LDCL intensity of the blood was enhanced in all the patients. Treatment with α-tocopherol decreased ROS blood concentration and resulted in positive dynamics of clini cal and laboratory parameters. By contrast, patients on the conventional treatment maintained high LDCL intensity and there was slowly resolved course of inflammation in many cases. So, α tocopherol improved redox status in patients with CAP and increased efficiency of the treatment.

scholarly journals Mutant p53R273Hattenuates the expression of phase 2 detoxifying enzymes and promotes the survival of cells with high levels of reactive oxygen species

2012 ◽  
Vol 125 (22) ◽  
pp. 5578-5586 ◽  
Author(s):  
Eyal Kalo ◽  
Ira Kogan-Sakin ◽  
Hilla Solomon ◽  
Elad Bar-Nathan ◽  
Moshe Shay ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Reactive Oxygen ◽  
Oxygen Species ◽  
Phase 2 ◽  
Detoxifying Enzymes

scholarly journals On the Origin and Fate of Reactive Oxygen Species in Plant Cell Compartments

Antioxidants ◽  
2019 ◽  
Vol 8 (4) ◽  
pp. 105 ◽  
Author(s):  
Janků ◽  
Luhová ◽  
Petřivalský
Keyword(s):  
Reactive Oxygen Species ◽  
Plant Cell ◽  
Nitrosative Stress ◽  
Reactive Oxygen ◽  
Redox Status ◽  
Stress Conditions ◽  
Ros Generation ◽  
Oxygen Species ◽  
Ros Scavenging ◽  
Cell Compartments

Reactive oxygen species (ROS) have been recognized as important signaling compoundsof major importance in a number of developmental and physiological processes in plants. Theexistence of cellular compartments enables efficient redox compartmentalization and ensuresproper functioning of ROS‐dependent signaling pathways. Similar to other organisms, theproduction of individual ROS in plant cells is highly localized and regulated bycompartment‐specific enzyme pathways on transcriptional and post‐translational level. ROSmetabolism and signaling in specific compartments are greatly affected by their chemicalinteractions with other reactive radical species, ROS scavengers and antioxidant enzymes. Adysregulation of the redox status, as a consequence of induced ROS generation or decreasedcapacity of their removal, occurs in plants exposed to diverse stress conditions. During stresscondition, strong induction of ROS‐generating systems or attenuated ROS scavenging can lead tooxidative or nitrosative stress conditions, associated with potential damaging modifications of cellbiomolecules. Here, we present an overview of compartment‐specific pathways of ROS productionand degradation and mechanisms of ROS homeostasis control within plant cell compartments.

Ascorbate and glutathione metabolism during development and desiccation of orthodox and recalcitrant seeds of the genus Acer

2007 ◽  
Vol 34 (7) ◽  
pp. 601 ◽  
Author(s):  
Stanislawa Pukacka ◽  
Ewelina Ratajczak
Keyword(s):  
Reactive Oxygen Species ◽  
Desiccation Tolerance ◽  
Reactive Oxygen ◽  
Redox Status ◽  
Seed Maturation ◽  
Monodehydroascorbate Reductase ◽  
Acer Pseudoplatanus ◽  
Oxygen Species ◽  
Norway Maple ◽  
Glutathione Cycle

The ascorbate–glutathione system was studied during development and desiccation of seeds of two Acer species differing in desiccation tolerance: Norway maple (Acer platanoides L., orthodox) and sycamore (Acer pseudoplatanus L., recalcitrant). The results showed remarkable differences in the concentration and redox balance of ascorbate and glutathione between these two kinds of seeds during development, and a significant dependence between glutathione content and acquisition of desiccation tolerance in Norway maple seeds. There were relatively small differences between the species in the activities of enzymes of the ascorbate–glutathione cycle: ascorbate peroxidase (APX, EC 1.11.1.11), monodehydroascorbate reductase (MR, EC 1.6.5.4), dehydroascorbate reductase (DHAR, EC 1.8.5.1), and glutathione reductase (GR, EC 1.6.4.2). At the end of seed maturation, ascorbic acid content and the activities of the above enzymes was about the same in both species The electrophoretic pattern of APX isoenzymes was also similar for both species, and the intensity of the bands decreased at the end of seed maturation in both species. When sycamore seeds were desiccated to a moisture content of less than 26%, there was a marked decrease in seed viability and an increase in the production of reactive oxygen species. During desiccation, Norway maple seeds had a more active defence system, which was reflected in a higher glutathione content, a higher glutathione redox status, a higher ascorbate redox status, and higher activities of APX, MR, DHAR, GR and GPX (glutathione peroxidase). During desiccation, sulfhydryl-to-disulfide transition into proteins was more intense in Norway maple seeds than sycamore seeds. All of these results suggest that, in orthodox seeds, the ascorbate–glutathione cycle plays an important role in the acquisition of tolerance to desiccation, in protein maturation, and in protection from reactive oxygen species.

LOWER EXPRESSION OF ANTI-OXIDANT ENZYMES IN HUMAN BETA CELL ACCOUNTS FOR THE VULNERABILITY TO REACTIVE OXYGEN SPECIES

2008 ◽  
Vol 86 (Supplement) ◽  
pp. 448
Author(s):  
A Miki ◽  
C Ricordi ◽  
A Mita ◽  
S Barker ◽  
R-D Molano ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Beta Cell ◽  
Reactive Oxygen ◽  
Oxygen Species ◽  
Anti Oxidant ◽  
Human Beta Cell ◽  
Lower Expression

MP44-02 BASELINE LEVELS OF SEMINAL REACTIVE OXYGEN SPECIES PREDICT IMPROVEMENTS IN SPERM FUNCTION FOLLOWING ANTI-OXIDANT THERAPY IN MEN WITH INFERTILITY

2020 ◽  
Vol 203 ◽  
pp. e656
Author(s):  
Tharu Tharakan* ◽  
Wayne Vessey ◽  
Cassandra McDonald ◽  
Paula Almeida ◽  
Monica Figueiredo ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Reactive Oxygen ◽  
Sperm Function ◽  
Oxygen Species ◽  
Anti Oxidant ◽  
Baseline Levels

Loss of Foxo3a In FA Mice Leads to Hematopoietic Stem Cell Exhaustion That Can Be Attenuated by Natural Anti-Oxidant Quercetin.

Blood ◽  
2010 ◽  
Vol 116 (21) ◽  
pp. 1166-1166
Author(s):  
Jie Li ◽  
Jared Sipple ◽  
Qishen Pang
Keyword(s):  
Reactive Oxygen Species ◽  
Progenitor Cells ◽  
Peripheral Blood ◽  
Conflicts Of Interest ◽  
Genetic Disorder ◽  
Specific Interaction ◽  
Reactive Oxygen ◽  
Oxygen Species ◽  
Hematopoietic Stem ◽  
Anti Oxidant

Abstract Abstract 1166 Fanconi anemia (FA) is a genetic disorder characterized by genomic instability, bone marrow (BM) failure and predisposition to cancer. However, FA mouse models do not show spontaneous genetic instability. Previous study shows that FOXO3a is associated with the FA pathway through oxidative stress-specific interaction with FANCD2. To address the consequence of loss of FOXO3a function in FA hematopoiesis, we generated Foxo3a-/-Fancd2-/- and Foxo3a-/-Fancc-/- double-knockout (DKO) mice by crossing Foxo3a+/− with Fancd2+/− or Fancc+/−; mice. Reactive oxygen species are increased in low-density BM (LDBM) cells isolated from DKO mice compared to those from single KO (SKO) or wt mice. Analysis of hematologic parameters shows significantly increased number of nucleate cells and high ratio of eosinophils in peripheral blood of DKO mice. CFU assay shows more progenitor cells in peripheral blood isolated from DKO mice. Moreover, BM progenitor cells from DKO mice exhibit lower adhesion but higher migration activity, compared to those from wt or SKO mice. Consistent with this, Cdc42 pull-down assay shows lower Cdc42 activity in DKO LDBM cells than in wt or SKO cells, indicating that decreased Cdc42 may contribute to the observed aberrant adhesion and migration activities. DKO mice show significant decrease in primitive progenitor (Lin-Sca-1+c-kit+; LSK) cells, increase in BrdU+ and G1-phase LSK cells, and impaired repopulating capacity after competitive BM transplantation, which can be attenuated by the anti-oxidant Quercetin. Taken together, loss of Foxo3a in FA mice results in FA-like syndrome, which may be resulted from increased reactive oxygen species accumulation. Disclosures: No relevant conflicts of interest to declare.

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