scholarly journals Regulation of Cu,Zn superoxide dismutase with copper. Caeruloplasmin maintains levels of functional enzyme activity during differentiation of K562 cells

1991 ◽  
Vol 274 (1) ◽  
pp. 153-158 ◽  
Author(s):  
S S Percival ◽  
E D Harris
Keyword(s):  
Superoxide Dismutase ◽  
De Novo ◽  
Specific Binding ◽  
K562 Cells ◽  
Sod Activity ◽  
Site Specific ◽  
Copper Protein ◽  
Mrna Concentration ◽  
Plasma Copper ◽  
Mnsod Activity

K562 cells, a human erythroleukaemic cell line blocked for differentiation, commit towards erythrocytes when exposed to haemin (20 microM). The cells synthesize fetal haemoglobins and show site-specific binding of caeruloplasmin, a plasma copper protein. These events are set into motion by haemin. On the assumption that the binding of caeruloplasmin could reflect a greater need for copper, we sought to determine whether the transfer of 67Cu from caeruloplasmin was accelerated in haemin-induced compared with non-induced K562 cells. Cu,Zn superoxide dismutase (CuZnSOD) was the recipient. Haemin induction caused the K562 cells to lose CuZnSOD activity. By 96 h, the level of SOD activity was less than 60% of that of non-induced cells. The loss was confined entirely to the CuZn form, MnSOD activity staying essentially unchanged. Although CuZnSOD activity declined with the haemin induction, the incorporation of [4,5-3H]lysine into immunoprecipitable CuZnSOD protein was unaffected. There was also no change in CuZnSOD mRNA concentration in haemin-induced cells. Thus a loss of enzyme did not correlate with a decline in the synthesis de novo of CuZnSOD protein. When 48 h-induced cells were transferred to a medium supplemented with 0.2 microM-caeruloplasmin, CuZnSOD activity was restored to control levels in 24 h. Caeruloplasmin also stimulated the incorporation of [3H]lysine into immunoprecipitable CuZnSOD protein. Caeruloplasmin addition may have affected a post-translational regulatory site for CuZnSOD biosynthesis, possibly by providing copper for the newly synthesized enzyme.

Regulation of lung manganese superoxide dismutase: species variation in response to lipopolysaccharide

1999 ◽  
Vol 276 (5) ◽  
pp. L705-L708 ◽  
Author(s):  
Ghenima Dirami ◽  
Donald Massaro ◽  
Linda Biadasz Clerch
Keyword(s):  
Superoxide Dismutase ◽  
Manganese Superoxide Dismutase ◽  
Critical Role ◽  
Mouse Lung ◽  
Translational Efficiency ◽  
Species Variation ◽  
Sod Activity ◽  
Mrna Concentration ◽  
Manganese Superoxide ◽  
Lps Treatment

Lipopolysaccharide (LPS) treatment increases survival of rats, but not of mice, during hyperoxia. Manganese superoxide dismutase (Mn SOD) in the lung plays a critical role in LPS-induced tolerance to hyperoxia in rats. Therefore, we now compared the response of lung Mn SOD with treatment of mice and rats with LPS. LPS treatment of rats increased Mn SOD activity and protein concentration, did not change its specific activity, increased Mn SOD mRNA concentration 35-fold, and elevated Mn SOD synthesis 50% without changing general protein synthesis. LPS treatment of mice did not alter any of these parameters except for a 16-fold increase in Mn SOD mRNA concentration. Mn SOD translational efficiency (synthesis/mRNA concentration) was diminished 93% in rat lung and 76% in mouse lung by treatment with LPS. However, the absolute translational efficiency was twofold higher in lungs of LPS-treated rats than in lungs of LPS-treated mice. The failure of LPS to raise Mn SOD activity in mouse lungs is due, at least in part, to a smaller increase in Mn SOD mRNA and lower translational efficiency in LPS-treated mice than in LPS-treated rats.

Polysaccharide Krestin Enhances Manganese Superoxide Dismutase Activity and mRNA Expression in Mouse Peritoneal Macrophages

2000 ◽  
Vol 28 (03n04) ◽  
pp. 331-341 ◽  
Author(s):  
Zhan-Jun Pang ◽  
Yuan Chen ◽  
Mei Zhou
Keyword(s):  
Superoxide Dismutase ◽  
Manganese Superoxide Dismutase ◽  
Tumor Therapy ◽  
Density Lipoprotein ◽  
Oxidative Injury ◽  
Peritoneal Macrophages ◽  
Sod Activity ◽  
Manganese Superoxide ◽  
Mouse Peritoneal Macrophages ◽  
Mnsod Activity

Manganese superoxide dismutase (MnSOD), an inductive antioxidant enzyme, can protect cells from oxidative injury to the mitochondria. The elevation of MnSOD activity in cells can effectively prevent many diseases associated with oxidative stress. Polysaccharide Krestin (PSK), a kind of protein-bound polysaccharide extracted from Coriolus versicolor, is used as an immune response modifier in anti-tumor therapy. We have previously found that PSK could alleviate the oxidative injury that oxidized low density lipoprotein (Ox-LDL) brought to monocytes/macrophages, and therefore had some preventive or therapeutic effect on atherosclerosis. In order to find out if the effects of PSK were associated with the alteration of antioxidant enzymes, we investigated its effect on MnSOD activity and gene expression in mouse peritoneal macrophages. The results showed that PSK could enhance SOD activity and increase the contents of MnSOD mRNA in mouse peritoneal macrophages. Furthermore, the induction of MnSOD by PSk could be blocked by cycloheximide and actinomycin D.

scholarly journals DNA-mediated self-assembly of gold nanoparticles on protein superhelix

2018 ◽  
Author(s):  
Tao Zhang ◽  
Ingemar André
Keyword(s):  
Gold Nanoparticles ◽  
Self Assembly ◽  
De Novo ◽  
Specific Binding ◽  
Protein Structures ◽  
Spatial Arrangement ◽  
Inorganic Nanoparticles ◽  
Covalent Attachment ◽  
Site Specific ◽  
Conjugation Method

AbstractRecent advances in protein engineering have enabled methods to control the self-assembly of protein on various length-scales. One attractive application for designed proteins is to direct the spatial arrangement of nanomaterials of interest. Until now, however, a reliable conjugation method is missing to facilitate site-specific positioning. In particular, bare inorganic nanoparticles tend to aggregate in the presence of buffer conditions that are often required for the formation of stable proteins. Here, we demonstrated a DNA mediated conjugation method to link gold nanoparticles with protein structures. To achieve this, we constructed de novo designed protein fibers based on previously published uniform alpha-helical units. DNA modification rendered gold nanoparticles with increased stability against ionic solutions and the use of complementary strands hybridization guaranteed the site-specific binding to the protein. The combination of high resolution placement of anchor points in designed protein assemblies with the increased control of covalent attachment through DNA binding can enable investigations of multilevel physical coupling events of nanocomponents on protein templates and expand the application of protein structures to material sciences.

Asymmetric Dopaminergic Dysfunction in Brain-First versus Body-First Parkinson’s Disease Subtypes

2021 ◽  
pp. 1-11
Author(s):  
Karoline Knudsen ◽  
Tatyana D. Fedorova ◽  
Jacob Horsager ◽  
Katrine B. Andersen ◽  
Casper Skjærbæk ◽  
...  
Keyword(s):  
Parkinson’S Disease ◽  
Parkinson's Disease ◽  
De Novo ◽  
Specific Binding ◽  
Asymmetry Index ◽  
The Body ◽  
Specific Binding Ratio ◽  
Dat Spect ◽  
Vagal Innervation ◽  
Nigrostriatal Degeneration

Background: We have hypothesized that Parkinson’s disease (PD) comprises two subtypes. Brain-first, where pathogenic α-synuclein initially forms unilaterally in one hemisphere leading to asymmetric nigrostriatal degeneration, and body-first with initial enteric pathology, which spreads through overlapping vagal innervation leading to more symmetric brainstem involvement and hence more symmetric nigrostriatal degeneration. Isolated REM sleep behaviour disorder has been identified as a strong marker of the body-first type. Objective: To analyse striatal asymmetry in [18F]FDOPA PET and [123I]FP-CIT DaT SPECT data from iRBD patients, de novo PD patients with RBD (PD +RBD) and de novo PD patients without RBD (PD - RBD). These groups were defined as prodromal body-first, de novo body-first, and de novo brain-first, respectively. Methods: We included [18F]FDOPA PET scans from 21 iRBD patients, 11 de novo PD +RBD, 22 de novo PD - RBD, and 18 controls subjects. Also, [123I]FP-CIT DaT SPECT data from iRBD and de novo PD patients with unknown RBD status from the PPPMI dataset was analysed. Lowest putamen specific binding ratio and putamen asymmetry index (AI) was defined. Results: Nigrostriatal degeneration was significantly more symmetric in patients with RBD versus patients without RBD or with unknown RBD status in both FDOPA (p = 0.001) and DaT SPECT (p = 0.001) datasets. Conclusion: iRBD subjects and de novo PD +RBD patients present with significantly more symmetric nigrostriatal dopaminergic degeneration compared to de novo PD - RBD patients. The results support the hypothesis that body-first PD is characterized by more symmetric distribution most likely due to more symmetric propagation of pathogenic α-synuclein compared to brain-first PD.

10-gingerol induces oxidative stress through HTR1A in cumulus cells: in-vitro and in-silico studies

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Kiptiyah Kiptiyah ◽  
Widodo Widodo ◽  
Gatot Ciptadi ◽  
Aulanni’am Aulanni’Am ◽  
Mohammad A. Widodo ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Cell Culture ◽  
Superoxide Dismutase ◽  
In Silico ◽  
Cumulus Cell ◽  
Cumulus Cells ◽  
Sod Activity ◽  
In Silico Studies ◽  
Incubation Periods

AbstractBackgroundWe investigated whether 10-gingerol is able to induce oxidative stress in cumulus cells.MethodsFor the in-vitro research, we used a cumulus cell culture in M199, containing 10-gingerol in various concentrations (0, 12, 16, and 20 µM), and detected oxidative stress through superoxide dismutase (SOD) activity and malondialdehyde (MDA) concentrations, with incubation periods of 24, 48, 72, and 96 h. The obtained results were confirmed by in-silico studies.ResultsThe in-vitro data revealed that SOD activity and MDA concentration increased with increasing incubation periods: SOD activity at 0 µM (1.39 ± 0.24i), 12 µM (16.42 ± 0.35ab), 16 µM (17.28 ± 0.55ab), 20 µM (17.81 ± 0.12a), with a contribution of 71.1%. MDA concentration at 0 µM (17.82 ± 1.39 l), 12 µM (72.99 ± 0.31c), 16 µM (79.77 ± 4.19b), 20 µM (85.07 ± 2.57a), with a contribution of 73.1%. Based on this, the in-silico data uncovered that 10˗gingerol induces oxidative stress in cumulus cells by inhibiting HTR1A functions and inactivating GSK3B and AKT˗1.Conclusions10-gingerol induces oxidative stress in cumulus cells through enhancing SOD activity and MDA concentration by inhibiting HTR1A functions and inactivating GSK3B and AKT˗1.

scholarly journals Site-Specific Binding of Non-Site-Specific Ions

2019 ◽  
Vol 116 (12) ◽  
pp. 2237-2239 ◽  
Author(s):  
Shi-Jie Chen
Keyword(s):  
Specific Binding ◽  
Site Specific

scholarly journals Attenuation of renal excretory responses to ANG II during inhibition of superoxide dismutase in anesthetized rats

2010 ◽  
Vol 298 (2) ◽  
pp. F401-F407 ◽  
Author(s):  
Md. Abdul Hye Khan ◽  
Mohammed Toriqul Islam ◽  
Alexander Castillo ◽  
Dewan Syed Abdul Majid
Keyword(s):  
Superoxide Dismutase ◽  
Nadph Oxidase ◽  
Oxidase Activity ◽  
Ang Ii ◽  
Sod Activity ◽  
Doppler Flowmetry ◽  
Nadph Oxidase Activity ◽  
Blood Flows ◽  
Renal Responses

To examine the functional interaction between superoxide dismutase (SOD) and NADPH oxidase activity, we assessed renal responses to acute intra-arterial infusion of ANG II (0.5 ng·kg−1·min−1) before and during administration of a SOD inhibitor, diethyldithiocarbamate (DETC, 0.5 mg·kg−1·min−1), in enalaprilat-pretreated (33 μg·kg−1·min−1) rats ( n = 11). Total (RBF) and regional (cortical, CBF; medullary; MBF) renal blood flows were determined by Transonic and laser-Doppler flowmetry, respectively. Renal cortical and medullary tissue NADPH oxidase activity in vitro was determined using the lucigenin-chemiluminescence method. DETC treatment alone resulted in decreases in RBF, CBF, MBF, glomerular filtration rate (GFR), urine flow (V), and sodium excretion (UNaV) as reported previously. Before DETC, ANG II infusion decreased RBF (−18 ± 3%), CBF (−16 ± 3%), MBF [−5 ± 6%; P = not significant (NS)], GFR (−31 ± 4%), V (−34 ± 2%), and UNaV (−53 ± 3%). During DETC infusion, ANG II also caused similar reductions in RBF (−20 ± 4%), CBF (−19 ± 3%), MBF (−2 ± 2; P = NS), and in GFR (−22 ± 7%), whereas renal excretory responses (V; −12 ± 2%; UNaV; −24 ± 4%) were significantly attenuated compared with those before DETC. In in vitro experiments, ANG II (100 μM) enhanced NADPH oxidase activity both in cortical [13,194 ± 1,651 vs. 20,914 ± 2,769 relative light units (RLU)/mg protein] and in medullary (21,296 ± 2,244 vs. 30,597 ± 4,250 RLU/mg protein) tissue. Application of DETC (1 mM) reduced the basal levels and prevented ANG II-induced increases in NADPH oxidase activity in both tissues. These results demonstrate that renal excretory responses to acute ANG II administration are attenuated during SOD inhibition, which seems related to a downregulation of NADPH oxidase in the deficient condition of SOD activity.

Platelet Superoxide Dismutase in Migraine and Tension-Type Headache

Cephalalgia ◽  
1994 ◽  
Vol 14 (3) ◽  
pp. 215-218 ◽  
Author(s):  
T Shimomura ◽  
H Kowa ◽  
T Nakano ◽  
A Kitano ◽  
H Marukawa ◽  
...  
Keyword(s):  
Superoxide Dismutase ◽  
Radical Scavenging ◽  
Tension Type Headache ◽  
Enzyme Linked Immunosorbent Assay ◽  
Control Group ◽  
Sod Activity ◽  
Low Concentrations ◽  
Type Headache ◽  
Tension Type Headaches ◽  
Headache Patients

Superoxide dismutase (SOD) is a radical-scavenging enzyme. We determined Cu, Zn-SOD concentrations and activities in platelets from subjects with migraine and tension-type headaches. Thirty migraine without aura (MWoA) patients, 9 migraine with aura (MWA) patients, and 53 tension-type headache patients were selected for study. Thirty healthy volunteers composed the control group. Concentrations of platelet SOD were determined using enzyme-linked immunosorbent assay techniques. The activity of platelet SOD was determined by measuring reductivity of nitroblue tetrazolium. Low concentrations of platelet SOD were found in patients with MWA and MWoA. Platelet SOD activity decreased in MWA patients but not in patients with MWoA or tension-type headaches. These findings suggest vulnerability to oxidative stress in patients with migraine. It is suggested that low platelet SOD levels may play an important role in the etiology of migraine.

scholarly journals Site-specific binding of wild-type p53 to cellular DNA is inhibited by SV40 T antigen and mutant p53.

1992 ◽  
Vol 6 (10) ◽  
pp. 1886-1898 ◽  
Author(s):  
J Bargonetti ◽  
I Reynisdottir ◽  
P N Friedman ◽  
C Prives
Keyword(s):  
Specific Binding ◽  
T Antigen ◽  
Mutant P53 ◽  
Wild Type ◽  
Sv40 T Antigen ◽  
Site Specific ◽  
Wild Type P53 ◽  
Cellular Dna
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