scholarly journals Mutations inSaccharomyces cerevisiaeIron-Sulfur Cluster Assembly Genes and Oxidative Stress Relevant to Cu,Zn Superoxide Dismutase

2004 ◽  
Vol 279 (29) ◽  
pp. 29938-29943 ◽  
Author(s):  
Laran T. Jensen ◽  
Raylene J. Sanchez ◽  
Chandra Srinivasan ◽  
Joan Selverstone Valentine ◽  
Valeria Cizewski Culotta
Keyword(s):  
Oxidative Stress ◽  
Superoxide Dismutase ◽  
Cluster Assembly ◽  
Sulfur Cluster ◽  
And Oxidative Stress

Aging and oxidative stress alter DNA repair mechanisms in male germ cells of superoxide dismutase-1 null mice

2021 ◽  
Author(s):  
Paulina Nguyen-Powanda ◽  
Bernard Robaire
Keyword(s):  
Oxidative Stress ◽  
Dna Damage ◽  
Dna Repair ◽  
Superoxide Dismutase ◽  
Germ Cells ◽  
Superoxide Dismutase 1 ◽  
Male Germ Cells ◽  
Dna Repair Mechanisms ◽  
Repair Mechanisms ◽  
And Oxidative Stress

Abstract The efficiency of antioxidant defense system decreases with aging, thus resulting in high levels of reactive oxygen species (ROS) and DNA damage in spermatozoa. This damage can lead to genetic disorders in the offspring. There are limited studies investigating the effects of the total loss of antioxidants, such as superoxide dismutase-1 (SOD1), in male germ cells as they progress through spermatogenesis. In this study, we evaluated the effects of aging and removing SOD1 (in male germ cells of SOD1-null (Sod1−/−) mice) in order to determine the potential mechanism(s) of DNA damage in these cells. Immunohistochemical analysis showed an increase in lipid peroxidation and DNA damage in the germ cells of aged wild-type (WT) and Sod1−/− mice of all age. Immunostaining of OGG1, a marker of base excision repair (BER), increased in aged WT and young Sod1−/− mice. In contrast, immunostaining intensity of LIGIV and RAD51, markers of non-homologous end-joining (NHEJ) and homologous recombination (HR), respectively, decreased in aged and Sod1−/− mice. Gene expression analysis showed similar results with altered mRNA expression of these key DNA repair transcripts in pachytene spermatocytes and round spermatids of aged and Sod1−/− mice. Our study indicates that DNA repair pathway markers of BER, NHEJ, and HR are differentially regulated as a function of aging and oxidative stress in spermatocytes and spermatids, and aging enhances the repair response to increased oxidative DNA damage, whereas impairments in other DNA repair mechanisms may contribute to the increase in DNA damage caused by aging and the loss of SOD1.

scholarly journals Random T-DNA Mutagenesis Identifies a Cu/Zn Superoxide Dismutase Gene as a Virulence Factor of Sclerotinia sclerotiorum

2013 ◽  
Vol 26 (4) ◽  
pp. 431-441 ◽  
Author(s):  
Liangsheng Xu ◽  
Weidong Chen
Keyword(s):  
Oxidative Stress ◽  
Growth Rate ◽  
Superoxide Dismutase ◽  
Sclerotinia Sclerotiorum ◽  
Virulence Factor ◽  
Wild Type ◽  
Expression Levels ◽  
Sclerotial Formation ◽  
Increased Sensitivity ◽  
And Oxidative Stress

Agrobacterium-mediated transformation (AMT) was used to identify potential virulence factors in Sclerotinia sclerotiorum. Screening AMT transformants identified two mutants showing significantly reduced virulence. The mutants showed growth rate, sclerotial formation, and oxalate production similar to that of the wild type. The mutation was due to a single T-DNA insertion at 212 bp downstream of the Cu/Zn superoxide dismutase (SOD) gene (SsSOD1, SS1G_00699). Expression levels of SsSOD1 were significantly increased under oxidative stresses or during plant infection in the wild-type strain but could not be detected in the mutant. SsSOD1 functionally complemented the Cu/Zn SOD gene in a Δsod1 Saccharomyces cerevisiae mutant. The SOD mutant had increased sensitivity to heavy metal toxicity and oxidative stress in culture and reduced ability to detoxify superoxide in infected leaves. The mutant also had reduced expression levels of other known pathogenicity genes such as endo-polygalacturanases sspg1 and sspg3. The functions of SsSOD1 were further confirmed by SsSOD1-deletion mutation. Like the AMT insertion mutant, the SsSOD1-deletion mutant exhibited normal growth rate, sclerotial formation, oxalate production, increased sensitivity to metal and oxidative stress, and reduced virulence. These results suggest that SsSOD1, while not being required for saprophytic growth and completion of the life cycle, plays critical roles in detoxification of reactive oxygen species during host–pathogen interactions and is an important virulence factor of Sclerotinia sclerotiorum.

scholarly journals Effect of silymarin on sodium fluoride-induced toxicity and oxidative stress in rat cardiac tissues

2012 ◽  
Vol 84 (4) ◽  
pp. 1121-1126 ◽  
Author(s):  
Seyed M. Nabavi ◽  
Seyed F. Nabavi ◽  
Akbar H. Moghaddam ◽  
William N. Setzer ◽  
Morteza Mirzaei
Keyword(s):  
Oxidative Stress ◽  
Superoxide Dismutase ◽  
Sodium Fluoride ◽  
Biochemical Parameters ◽  
Reduced Glutathione ◽  
Thiobarbituric Acid ◽  
Glutathione Level ◽  
Thiobarbituric Acid Reactive Substances ◽  
Cardiac Tissues ◽  
And Oxidative Stress

This study aim to evaluate the protective effect of silymarin on sodium fluoride-induced oxidative stress in rat cardiac tissues. Animals were pretreated with silymarin at 20 and 10 mg/kg prior to sodium fluoride consumption (600 ppm through drinking water). Vitamin C at 10 mg/kg was used as standard antioxidant. There was a significant increase in thiobarbituric acid reactive substances level (59.36 ± 2.19 nmol MDA eq/g tissue) along with a decrease in antioxidant enzymes activity (64.27 ± 1.98 U/g tissue for superoxide dismutase activity and 29.17 ± 1.01 µmol/min/mg protein for catalase activity) and reduced glutathione level (3.8 ± 0.15 µg/mg protein) in the tissues homogenates of the sodium fluoride-intoxicated rats. Silymarin administration to animals before sodium fluoride consumption modified the levels of biochemical parameters.

scholarly journals Assessment of thyroid dysfunction, dyslipidemia and oxidative stress in hypertensive end stage chronic renal disease patients in a teaching hospital in Western Uttar Pradesh

2019 ◽  
Vol 10 (5) ◽  
pp. 13-18
Author(s):  
Poonam Kachhawa ◽  
Vivek Sinha
Keyword(s):  
Oxidative Stress ◽  
Cardiovascular Disease ◽  
Superoxide Dismutase ◽  
Renal Disease ◽  
Lipid Profile ◽  
Thyroid Dysfunction ◽  
Chronic Renal Disease ◽  
Economic Output ◽  
End Stage ◽  
And Oxidative Stress

Background: CKD is a serious health problem in worldwide. In developing nation, CKD has severe implication on health and economic output. The rapid increase of common risk factors such as hypertension (HTN), obesity and type 2 diabetes will result in greater and more burdens to developing country. There are many complications associated with CKD including thyroid dysfunction, dyslipidemia,hypertension and cardiovascular disease (CVD).It is generally seen that patients suffering from CKD are at high risk of cardiovascular disease. Aims and Objectives: The purpose of the study was to evaluate the diagnostic screening of thyroid dysfunction, dyslipidemia and oxidative stress in hypertensive end stage chronic renal disease patients. Materials and Methods: Thyroid status, Lipid profile, serum Urea, serum Creatinine, serum Uric acid, serum electrolyte, Catalase,Malondialdehyde (MDA) and Superoxide dismutase (SOD) were assayed in 160 subjects in which 80 patients of CKD were having hypertension and 80 healthy controls. Results: In our study, we found statistical significantly increased level of (p<0.001) of malondialdehyde (MDA) and significantly decreased level (p<0.001) of Catalase and Superoxide dismutase (SOD).There was found significantly increased level (p<0.001) of TSH in CKD associated with hypertension patients.We also found deranged lipid profile and renal functions in CKD associated with hypertension patients as compared to controls. Conclusion: In the present study, we arrived at conclusion that dyslipidemia and thyroid dysfunction is very common in CKD patients. Our study revealed that there was significant association between thyroid dysfunction and CKD progression and dyslipidemia. The antioxidant status is assessed through changes in antioxidant enzymatic activity in patients of CKD with hypertensive and data provide evidence of blood pressure modulation by measurable oxidative stress–related parameters.

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