Role of antioxidant defenses during estivation and anoxia exposure in the freshwater snail Biomphalaria tenagophila (Orbigny, 1835)

2003 ◽  
Vol 81 (7) ◽  
pp. 1239-1248 ◽  
Author(s):  
Marcus V.R Ferreira ◽  
Antonieta C.R Alencastro ◽  
Marcelo Hermes-Lima
Keyword(s):  
Thiobarbituric Acid ◽  
Freshwater Snail ◽  
Antioxidant Defenses ◽  
Oxygen Species ◽  
Thiobarbituric Acid Reactive Substances ◽  
Glutathione S Transferase ◽  
Sod Activity ◽  
Glucose 6 Phosphate Dehydrogenase ◽  
Gpx Activity

The effects of 24 h of exposure to underwater anoxia and 15 days of estivation (at 26–27°C) on the enzymatic antioxidant system of the hepatopancreas of the freshwater snail Biomphalaria tenagophila (Planorbidae) are described. The effect of 24 h of recovery was also investigated. Catalase activity dropped by 31% during 24 h of anoxia, and superoxide dismutase (SOD) activity was reduced by 43% during the 15 days of estivation. This is consistent with the overall decrease in metabolic rate during estivation or anoxia. Indeed, the heartbeat diminished by 28–36% during estivation (determination was possible for only 4 days) and by 66% after 24 h of anoxia. On the other hand, selenium-dependent glutathione peroxidase (Se-GPX) activity increased during anoxia (from 10 to 14 mU/mg protein) and estivation (by 14%). Glutathione S-transferase (GST) and glutathione reductase activities remained unchanged during estivation and anoxia. Glucose 6-phosphate dehydrogenase activity was unchanged during estivation and recovery. Recovery restored SOD activity. Catalase, Se-GPX, and GST activities during recovery were significantly lower than those of the respective controls. Lipid peroxidation, determined as the level of thiobarbituric acid-reactive substances, was unchanged in the hepatopancreas after 15 days of estivation and 26 h of recovery from estivation. It is possible that the increase in Se-GPX activity during anoxia and estivation, and the maintenance of GST activity, are relevant in minimizing the effects of reactive oxygen species that can be formed upon resumption of aerobic metabolism. Thus, B. tenagophila may have a biochemical strategy of preparation for oxidative stress such as that observed in several other species of anoxia/hypoxia-tolerant animals.

Membrane-type matrix metalloproteinase-9 activity in placental tissue from patients with pre-existing and gestational diabetes mellitus

2000 ◽  
Vol 12 (6) ◽  
pp. 269 ◽  
Author(s):  
Carolina Pustovrh ◽  
Alicia Jawerbaum ◽  
Debora Sinner ◽  
Mario Pesaresi ◽  
Mario Baier ◽  
...  
Keyword(s):  
Diabetes Mellitus ◽  
Matrix Metalloproteinase ◽  
Placental Tissue ◽  
Thiobarbituric Acid ◽  
Thiobarbituric Acid Reactive Substances ◽  
Sod Activity ◽  
No Donors ◽  
Membrane Type ◽  
Metalloproteinase 9

The activity of matrix metalloproteinase (MMP)-9 was evaluated in placental tissue from healthy subjects (controls) and from patients with gestational and pre-existing diabetes mellitus (GDM and PDM, respectively). Compared with controls, MMP-9 activity was greater in placental tissue from patients with PDM and lower in placental tissue from patients with GDM. The modulatory role of nitric oxide (NO) and reactive oxygen species (ROS) on MMP-9 activity in placental tissue was evaluated. In healthy placenta, NO synthase inhibitors diminished MMP-9 activity, whereas NO donors enhanced it. The addition of xanthine/xanthine oxidase or hydrogen peroxide to placental incubates enhanced MMP-9 activity, while the addition of superoxide dismutase (SOD) diminished it. In placental tissue from patients with PDM, MMP-9 activity was stimulated by NO and by ROS. In placental tissue from patients with PDM, concentrations of nitrates/nitrites and thiobarbituric acid-reactive substances (TBARS) were enhanced, whereas SOD activity was decreased, suggesting that elevated concentrations of NO and ROS may be related to the enhanced MMP-9 concentrations found in these tissues. In placenta from GDM patients, in which a diminished concentration of MMP-9 were detected, nitrate/nitrite concentrations were increased, but placental MMP-9 activity did not change in the presence of either NO donors or inhibitors. The activity of MMP-9 in placental tissue from patients with GDM was stimulated by ROS donor systems and was inhibited by the addition of SOD; however, TBARS and SOD concentrations were unchanged in these tissues compared with controls. These findings demonstrate that placental MMP-9 activity is modulated by NO and ROS and that, in diabetic pathology, NO and ROS may determine changes in MMP-9 activity, which are probably involved in the structural and functional abnormalities of diabetic placental tissue.

scholarly journals Abscisic Acid in Coordination with Nitrogen Alleviates Salinity-Inhibited Photosynthetic Potential in Mustard by Improving Proline Accumulation and Antioxidant Activity

Stresses ◽  
2021 ◽  
Vol 1 (3) ◽  
pp. 162-180
Author(s):  
Arif Majid ◽  
Bilal A. Rather ◽  
Asim Masood ◽  
Zebus Sehar ◽  
Naser A. Anjum ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Antioxidant Enzymes ◽  
Abscisic Acid ◽  
Photosynthetic Activity ◽  
Thiobarbituric Acid ◽  
Salinity Treatment ◽  
Oxygen Species ◽  
Thiobarbituric Acid Reactive Substances ◽  
Photosynthetic Potential

This investigation was done to assess the role of abscisic acid (ABA; 25 µM) and/or nitrogen (N; 10 mM) in the alleviation of salinity (NaCl; 100 mM)-induced reduction in photosynthetic activity and growth, N and sulfur (S) assimilation of mustard (Brassica juncea L.) cv. RH0-749. Salinity treatment caused oxidative stress and significantly elevated the content of both H2O2 and thiobarbituric acid reactive substances (TBARS), and impaired photosynthetic activity and growth, but increased the content of nitrogenous osmolyte proline and the activity of antioxidant enzymes involved in the metabolism of reactive oxygen species. The application of 25 µM ABA under a controlled condition negatively affected photosynthesis and growth. However, ABA, when combined with N, minimized oxidative stress and mitigated the salinity-inhibited effects by increasing the activity of antioxidant enzymes (superoxide dismutase, SOD; glutathione reductase, GR; ascorbate peroxidase, APX) and proline content. Overall, the supplementation of 10 mM N combined with 25 µM ABA provides an important strategy for enhancing the photosynthetic potential of B. juncea under saline conditions.

scholarly journals Can daily consumption of a nephroprotective homeopathic product protect the kidneys from gentamicin toxicity?

2021 ◽  
Vol 10 (7) ◽  
pp. e53310716592
Author(s):  
Giovana Carolina Machado ◽  
Patricia Glombowsky ◽  
Gabriela Miotto Galli ◽  
Bianca Fagan Bissacotti ◽  
Priscila Marquezan Copetti ◽  
...  
Keyword(s):  
Thiobarbituric Acid ◽  
Oxygen Species ◽  
Thiobarbituric Acid Reactive Substances ◽  
Glutathione S Transferase ◽  
Daily Consumption ◽  
Tissue Samples ◽  
Nitrite Nitrate ◽  
Experimental Renal Failure ◽  
And Oxidative Stress ◽  
Decrease Lipid Peroxidation

The objective of this work was to determine whether preventive consumption of a homeopathic product via drinking water would protect mouse kidneys from a challenge with the nephrotoxic antibiotic gentamicin. We used 40 Swiss mice divided into four groups with ten animals each. The homeopathic product was supplied through water for 30 days in a preventive manner and gentamicin for 10 days to induce an experimental renal failure. The groups were as follows: Negative-CT (homeopathic and gentamicin was not provided), Positive-CT (did not receive homeopathic, but received gentamicin 40 mg/kg), T2 (received 0.002 ml of the product per animal/day, and received gentamicin 40 mg/kg), and T4 (0.004 ml of the product per animal/day and received gentamicin 40 mg/kg). On days 12 and 20, blood and tissue samples were collected from five animals in each group. No histopathological lesions were found in mouse kidneys. However, levels of thiobarbituric acid reactive substances, reactive oxygen species, and nitrite/nitrate ratios in the kidney of the Positive-CT group were higher compared to the other groups. As for glutathione S-transferase, on the 20th day, the groups that used the homeopathic product (T2 and T4) had higher activities than the positive TC. Therefore, the results suggest that prophylactic consumption of the hepatoprotective homeopathic product can decrease lipid peroxidation, nitrous stress, and oxidative stress at the renal level when consecutive doses of gentamicin induce insufficiency.

scholarly journals Benfotiamine reduces oxidative damage in muscle of endurance-trained mouse.

2019 ◽  
Vol 41 ◽  
pp. e46888
Author(s):  
Álisson de Carvalho Gonçalves ◽  
Renata Campos Leão ◽  
Fábio Lera Orsatti ◽  
Guilherme Vannucchi Portari
Keyword(s):  
Oxidative Damage ◽  
Gastrocnemius Muscle ◽  
Thiobarbituric Acid ◽  
Redox Status ◽  
Antioxidant Defenses ◽  
Standard Diet ◽  
Thiobarbituric Acid Reactive Substances ◽  
Sod Activity ◽  
Oral Supplementation ◽  
Protein Thiols

High levels of reactive oxygen species can trigger an imbalance in redox status, which generates oxidative damage in macromolecules. The present study aimed to investigate the influence of oral supplementation with benfotiamine on oxidative stress and antioxidant activity in muscle of trained mice. Twenty-five male Balb/c mice were placed in groups. Sta-Sed: standard diet and sedentary (n = 6); Ben-Sed: benfotiamine supplemented and sedentary (n = 6); Sta-Tr: standard diet and trained (n = 6); and Ben-Tr: benfotiamine supplemented and trained (n = 7). Standard diet was AIN-93 growth and supplemented diet was AIN-93 with benfotiamine (500 mg kg-1). Trained mice were submitted to 6-weeks of endurance swimming training. The concentration of thiobarbituric acid reactive substances (TBARS), non-protein thiols, catalase (CAT) and superoxide dismutase activities (SOD) were analyzed in the gastrocnemius muscle. TBARS concentration was lower in the Ben-Tr group than in Ben-Sed and Sta-Tr groups. Thiol levels were higher in the Ben-Sed group than in the non-supplemented groups. CAT activity was more pronounced in both supplemented groups while SOD activity was higher in the Ben-Tr group than in the non-supplemented groups. The results show that benfotiamine supplementation is effective in enhancing antioxidant defenses and reducing oxidative damage in muscle of endurance-trained mouse.

scholarly journals Oxidative stress biomarkers and acetylcholinesterase activity in human erythrocytes exposed to clomazone (in vitro)

2011 ◽  
Vol 4 (3) ◽  
pp. 149-153 ◽  
Author(s):  
Adriana Santi ◽  
Charlene Menezes ◽  
Marta Duarte ◽  
Jossiele Leitemperger ◽  
Thais Lópes ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Thiobarbituric Acid ◽  
Acetylcholinesterase Activity ◽  
Human Erythrocytes ◽  
Thiobarbituric Acid Reactive Substances ◽  
Oxidative Stress Biomarkers ◽  
Sod Activity ◽  
Stress Biomarkers

Oxidative stress biomarkers and acetylcholinesterase activity in human erythrocytes exposed to clomazone (in vitro)The aim of this study was to investigate the effect of clomazone herbicide on oxidative stress biomarkers and acetylcholinesterase activity in human erythrocytes inin vitroconditions. The activity of catalase (CAT), superoxide dismutase (SOD) and acetylcholinesterase (AChE), as well as the levels of thiobarbituric acid reactive substances (TBARS) and reduced glutathione (GSH) were measured in human erythrocytes exposed (in vitro) to clomazone at varying concentrations in the range of 0, 100, 250 and 500 μg/L for 1 h at 37°C. TBARS levels were significantly higher in erythrocytes incubated with clomazone at 100, 250 and 500 μg/L. However, erythrocyte CAT and AChE activities were decreased at all concentrations tested. SOD activity was increased only at 100 μg/L of clomazone. GSH levels did not change with clomazone exposure. These results clearly showed clomazone to induce oxidative stress and AChE inhibition in human erythrocytes (in vitro). We, thus, suggest a possible role of ROS on toxicity mechanism induced by clomazone in humans.

scholarly journals Lens Lipid Peroxides and Glutathione Concentrations in Diabetic Cataract

1997 ◽  
Vol 34 (2) ◽  
pp. 190-192 ◽  
Author(s):  
D Özmen ◽  
I Mutaf ◽  
B Özmen ◽  
J Mentes ◽  
O Bayindir
Keyword(s):  
G Protein ◽  
Lipid Peroxide ◽  
Lipid Peroxides ◽  
Thiobarbituric Acid ◽  
Thiobarbituric Acid Reactive Substances ◽  
Diabetic Cataract ◽  
Free Radical Damage ◽  
Significant Difference ◽  
Radical Damage

This study aims to explore the role of reactive oxygen radicals in the genesis of diabetic cataract. Lipid peroxide (LPO) concentrations in senile ( n = 30) and diabetic ( n = 14) cataractous lenses, were determined as thiobarbituric acid-reactive substances (TBARS) by a method modified from Satoh and Yagi, and reduced glutathione (GSH) concentrations were measured according to Beutler. Lens LPO levels (mean, SD; nmol TBARS/g protein) were significantly higher in diabetics (107·54, 18·12) than senile cataractous subjects (53·54, 15·48) ( P < 0·0001). Lens GSH levels (mean, SD; nmol/g protein) showed no significant difference between diabetics (4·29, 2·05) and senile cataractous subjects (4·68, 3·12). These results suggest that free radical damage is more effective in the genesis of diabetic cataract than in senile cataract.

Antioxidant defenses and metabolic depression in a pulmonate land snail

1995 ◽  
Vol 268 (6) ◽  
pp. R1386-R1393 ◽  
Author(s):  
M. Hermes-Lima ◽  
K. B. Storey
Keyword(s):  
Oxidative Stress ◽  
Glutathione Peroxidase ◽  
Defense Mechanisms ◽  
Antioxidant Defense ◽  
Thiobarbituric Acid ◽  
Land Snail ◽  
Land Snails ◽  
Antioxidant Defenses ◽  
Glutathione S Transferase ◽  
Hypometabolic State

During arousal from estivation oxygen consumption by land snails (Otala lactea) increases severalfold. To determine whether snails prepared for an accompanying rise in the rates of oxyradical generation by altering their antioxidant defense mechanisms, changes in the activities of antioxidant enzymes and lipid peroxidation products were quantified in foot and hepatopancreas of control, 30-day estivating, and aroused snails. Compared with controls, estivating O. lactea showed significant increases in the activities of foot muscle superoxide dismutase (SOD) (increasing by 56-67%), catalase (51-72%), and glutathione S-transferase (79-108%), whereas, in hepatopancreas, SOD (57-78%) and glutathione peroxidase (93-144%) increased. Within 40 min after arousal began, hepatopancreas glutathione peroxidase activity had returned to control values, but SOD showed a further 70% increase in activity but then returned to control levels by 80 min. Estivation had no effect on total glutathione (GSH + 2 GSSG) concentrations in tissues, but GSSG content had increased about twofold in both organs of 30-day dormant snails. Lipid peoxidation (quantified as thiobarbituric acid reactive substances) was significantly enhanced at the onset of arousal from dormancy, indicating that oxidative stress and tissue damage occurred at this time. The data suggest that antioxidant defenses in snail organs are increased while snails are in the hypometabolic state as a preparation for oxidative stress during arousal.

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