scholarly journals Age-Dependent Demethylation ofSod2Promoter in the Mouse Femoral Artery

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Albert Nguyen ◽  
François Leblond ◽  
Maya Mamarbachi ◽  
Steve Geoffroy ◽  
Eric Thorin
Keyword(s):  
Endothelial Function ◽  
Femoral Artery ◽  
Promoter Methylation ◽  
Transcriptional Activity ◽  
Manganese Superoxide Dismutase ◽  
Defense Mechanism ◽  
Age Related ◽  
Manganese Superoxide ◽  
Age Dependent

We studied the age-dependent regulation of the expression of the antioxidant enzyme manganese superoxide dismutase (MnSOD encoded bySod2) through promoter methylation. C57Bl/6 mice were either (i) sedentary (SED), (ii) treated with the antioxidant catechin (CAT), or (iii) voluntarily exercised (EX) from weaning (1-month old; mo) to 9 mo. Then, all mice aged sedentarily and were untreated until 12 mo.Sod2promoter methylation was similar in all groups in 9 mo but decreased (p<0.05) in 12 mo SED mice only, which was associated with an increased (p<0.05) transcriptional activityin vitro. At all ages, femoral artery endothelial function was maintained; this was due to an increased (p<0.05) contribution of eNOS-derived NO in 12 mo SED mice only. CAT and EX prevented these changes in age-related endothelial function. Thus, a ROS-dependent epigenetic positive regulation ofSod2gene expression likely represents a defense mechanism prolonging eNOS function in aging mouse femoral arteries.

Abstract 1421: In Vivo Measurement of Flow-Mediated Vasodilation in Living Rats using High Resolution Ultrasound: Age-Dependent Endothelial Dysfunction

Circulation ◽  
2007 ◽  
Vol 116 (suppl_16) ◽  
Author(s):  
Christian Heiss ◽  
Richard E Sievers ◽  
Nicolas Amabile ◽  
Tony Y Momma ◽  
Shobha Natarajan ◽  
...  
Keyword(s):  
High Resolution ◽  
Endothelial Dysfunction ◽  
Endothelial Function ◽  
Femoral Artery ◽  
Reactive Hyperemia ◽  
Surrogate Marker ◽  
Flow Measurements ◽  
Age Related ◽  
Age Dependent

In humans, endothelial function serves as a surrogate marker for cardiovascular health and is measured as changes in arterial diameter after temporary ischemia (flow-mediated dilation; FMD). We developed an FMD-related approach to study conduit artery vasodilation in living rats, and demonstrate a reduction in FMD in older versus younger animals consistent with age-related endothelial dysfunction. Diameter and Doppler-flow measurements were obtained from the femoral artery using high-resolution ultrasound (35 MHz). We observed dose-dependent vasodilation using both endothelium-dependent and endothelium-independent pharmacologic vasodilators (acetylcholine and nitroglycerine). Flow-dependent vasodilation was observed in response to flow increase induced both by adenosine and local saline infusion. Transient hindlimb ischemia led to reactive hyperemia with sequential flow velocity increase and femoral artery dilation, the latter of which was completely abolished by NO-synthase (NOS) inhibition with L-NMMA. To demonstrate its applicability in a model of endothelial dysfunction, we show that FMD is significantly reduced in older versus younger animals. While FMD was completely NOS-dependent in younger animals, NOS-dependent mechanisms accounted for only half of the FMD in older animals, with the remainder being blocked by charybdotoxin (CTx) and apamin suggesting contribution of endothelium-derived-hyperpolarizing-factor. Using this new integrative physiologic model to reproducibly study FMD in living rats, we show that age-dependent endothelial dysfunction is accompanied by a shift in mechanisms underlying vasodilatory endothelial function.

scholarly journals Manganese superoxide dismutase as a target of autoantibodies in acute Epstein-Barr virus infection.

1994 ◽  
Vol 180 (5) ◽  
pp. 1995-1998 ◽  
Author(s):  
K Ritter ◽  
R J Kühl ◽  
F Semrau ◽  
H Eiffert ◽  
H D Kratzin ◽  
...  
Keyword(s):  
Superoxide Dismutase ◽  
Epstein Barr Virus ◽  
Manganese Superoxide Dismutase ◽  
Clinical Symptoms ◽  
Epstein Barr Virus Infection ◽  
Barr Virus ◽  
Ebv Infection ◽  
Manganese Superoxide ◽  
Epstein Barr

Antibodies directed against the autoantigen p26 were detected in sera from 32 patients with acute Epstein-Barr virus (EBV) infection and clinical symptoms of infectious mononucleosis. P26 has now been identified as the enzyme manganese superoxide dismutase (MnSOD) by comparison of the NH2-terminal amino acid sequence. Antibodies against MnSOD belong to the immunoglobulin class M. They are not detectable in sera of patients with other herpesvirus infections. In the 32 patients investigated, the rise and fall of the autoantibodies coincides with the clinical symptoms. In vitro, the autoantibodies were shown to inhibit the dismutation of superoxide radicals by blocking MnSOD. As presented in the discussion this effect may contribute to the pathogenesis of acute EBV infection.

scholarly journals MnSOD protects against COX1-mediated endothelial dysfunction in chronic heart failure

2010 ◽  
Vol 298 (5) ◽  
pp. H1600-H1607 ◽  
Author(s):  
Jordan D. Miller ◽  
Veronica A. Peotta ◽  
Yi Chu ◽  
Robert M. Weiss ◽  
Kathy Zimmerman ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Heart Failure ◽  
Chronic Heart Failure ◽  
Endothelial Dysfunction ◽  
Endothelial Function ◽  
Vascular Function ◽  
Manganese Superoxide Dismutase ◽  
Reduced Ejection Fraction ◽  
Manganese Superoxide ◽  
Cox Inhibitor

Endothelial function is impaired by oxidative stress in chronic heart failure (HF). Mechanisms that protect against increases in oxidative stress in HF are not clear. The goal of this study was to determine whether manganese superoxide dismutase (MnSOD) plays a key role in protecting against endothelial dysfunction in HF. Endothelial function and gene expression were examined in aorta from wild-type mice (MnSOD+/+) and mice deficient in MnSOD (MnSOD+/−) 12 wk after ligation of the left coronary artery (LCA). LCA ligation produced similar size myocardial infarctions in MnSOD+/+ and MnSOD+/− mice and reduced ejection fraction to ∼20% in both groups. Maximal relaxation in response to acetylcholine was 78 ± 3% (mean ± SE) and 66 ± 8% in sham-operated MnSOD+/+ and MnSOD+/− mice, respectively. Expression of antioxidant enzymes increased in MnSOD+/+ mice with HF, and maximal relaxation to acetylcholine was slightly impaired (68 ± 4%). Greater endothelial dysfunction was observed in MnSOD+/− mice with HF (46 ± 5%, P < 0.05), which was significantly improved by polyethylene glycol-catalase but not Tempol. Incubation with the nonspecific cyclooxygenase (COX) inhibitor indomethacin or the COX1 inhibitor valeryl salicylate, but not the COX-2 inhibitor NS-398, significantly improved relaxation to acetylcholine in HF mice (maximum relaxation = 74 ± 5, 91 ± 1, and 58 ± 5%). These data suggest that MnSOD plays a key role in protecting against endothelial dysfunction in HF. A novel mechanism was identified whereby chronic increases in oxidative stress, produced by mitochondrial SOD deficiency, impair vascular function via a hydrogen peroxide-dependent, COX1-dependent, endothelium-derived contracting factor.

scholarly journals Radioprotection In Vitro and In Vivo by Minicircle Plasmid Carrying the Human Manganese Superoxide Dismutase Transgene

2008 ◽  
Vol 19 (8) ◽  
pp. 820-826 ◽  
Author(s):  
Xichen Zhang ◽  
Michael W. Epperly ◽  
Mark A. Kay ◽  
Zhi-Ying Chen ◽  
Tracy Dixon ◽  
...  
Keyword(s):  
Superoxide Dismutase ◽  
Manganese Superoxide Dismutase ◽  
Manganese Superoxide

In vitro cell free synthesis of human manganese superoxide dismutase with the RTS 500 system

2003 ◽  
Vol 786 (1-2) ◽  
pp. 137-142
Author(s):  
Michael Kleines ◽  
Martin Nellessen ◽  
Lars Schaade ◽  
Klaus Ritter
Keyword(s):  
Superoxide Dismutase ◽  
Manganese Superoxide Dismutase ◽  
Manganese Superoxide

scholarly journals Antioxidant Effect of Soymilk Fermented by Lactobacillus plantarum HFY01 on D-Galactose-Induced Premature Aging Mouse Model

2021 ◽  
Vol 8 ◽  
Author(s):  
Chong Li ◽  
Yang Fan ◽  
Shuang Li ◽  
Xianrong Zhou ◽  
Kun-Young Park ◽  
...  
Keyword(s):  
Superoxide Dismutase ◽  
Lactobacillus Plantarum ◽  
High Performance ◽  
Manganese Superoxide Dismutase ◽  
Antioxidant Effect ◽  
Premature Aging ◽  
Lactobacillus Bulgaricus ◽  
Manganese Superoxide ◽  
Genes Encoding

The antioxidant effect of soymilk fermented by Lactobacillus plantarum HFY01 (screened from yak yogurt) was investigated on mice with premature aging induced by D-galactose. In vitro antioxidant results showed that L. plantarum HFY01-fermented soymilk (LP-HFY01-DR) had better ability to scavenge the free radicals 1,1-diphenyl-2-picrylhydrazyl (DPPH) and 2,2′-azino-bis (3-ethylbenzthiazoline-6-sulphonic acid) diammonium salt (ABTS) than unfermented soymilk and Lactobacillus bulgaricus-fermented soymilk. Histopathological observation showed that LP-HFY01-DR could protect the skin, spleen and liver, reduce oxidative damage and inflammation. Biochemical results showed that LP-HFY01-DR could effectively upregulate glutathione (GSH), catalase (CAT), superoxide dismutase (SOD), and glutathione peroxidase (GSH-Px) levels and decrease malondialdehyde (MDA) content in the liver, brain, and serum. Real-time quantitative reverse transcription polymerase chain reaction further showed that LP-HFY01-DR could promote the relative expression levels of the genes encoding for cuprozinc superoxide dismutase (Cu/Zn-SOD, SOD1), manganese superoxide dismutase (Mn-SOD, SOD2), CAT, GSH, and GSH-Px in the liver, spleen, and skin. High-performance liquid chromatography results revealed daidzin, glycitin, genistin, daidzein, glycitein, and genistein in LP-HFY01-DR. In conclusion, LP-HFY01-DR could improve the antioxidant capacity in mice with premature aging induced by D-galactose.

scholarly journals SUPPRESSION OF MANGANESE SUPEROXIDE DISMUTASE ACTIVITY IN ROTENONE-TREATED HUMAN GLIOBLASTOMA T98G CELLS REDUCES CELL VIABILITY

2018 ◽  
Vol 11 (1) ◽  
pp. 48
Author(s):  
Septelia Inawati Wanandi ◽  
Novi Silvia Hardiany ◽  
Nurjati Chairani Siregar ◽  
Mohamad Sadikin
Keyword(s):  
Superoxide Dismutase ◽  
Cell Viability ◽  
Manganese Superoxide Dismutase ◽  
Specific Activity ◽  
High Dose ◽  
Human Glioblastoma ◽  
Manganese Superoxide ◽  
Rotenone Treatment ◽  
Intracellular Ros

  Objective: Glioma is the most common human primary brain tumor which is highly resistant to oxidative stress-based anticancer. The aim of this study was to analyze the effect of rotenone-induced reactive oxygen species (ROS) on the modulation of manganese superoxide dismutase (MnSOD) expression and cell viability in human glioblastoma (GBM) T98G cells.Methods: In this in vitro experimental study, T98G cells were treated with high-dose rotenone (0.5, 5, and 50 μM, respectively). Following rotenone treatment and intracellular ROS, both peroxide and superoxide radicals were determined. Moreover, we analyzed MnSOD mRNA expression, protein, and specific activity, as well as cell survival including viability, proliferation, apoptosis, and mitochondrial structure.Results: High-dose rotenone treatment of T98G cells significantly increased intracellular ROS and MnSOD mRNA, but its protein and specific activity definitely decreased. The treatment also led to a reduction of cell viability, enhancement of apoptosis, and disruption of mitochondrial integrity.Conclusion: Overproduction of ROS in rotenone-treated human GBM T98G cells could suppress the MnSOD protein level and activity even though mRNA synthesis has been increased. This modulation led to reduced survival of T98G cells through induction of cell death rather than inhibition of cell proliferation.

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