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  • Author: Manuela Padurariu x
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Alin Ciobica, Lucian Hritcu, Veronica Nastasa, Manuela Padurariu and Walther Bild

Inhibition of Central Angiotensin Converting Enzyme Exerts Anxiolytic Effects by Decreasing Brain Oxidative Stress

This study investigated the effects of angiotensin II and captopril intracerebroventricular administration on anxiety status and brain oxidative stress. Elevated plus maze was used in order to asses the anxiety-like behavior, while the biochemical analysis included the determination of some antioxidant defense enzymes like superoxide dismutase and glutathione peroxidase and also a lipid peroxidation product (malondialdehyde). Our results provide additional evidence of angiotensin II induced anxiety-like effects and increased prooxidant status. Moreover, the blockade of angiotensin II, by the administration of an angiotensin converting enzyme inhibitor (captopril) resulted in anxiolytic effects and decreased oxidative stress status. In addition, we found a significant correlation between the time spent by rats in the open arms of the elevated plus maze and oxidative stress markers. This could raise important therapeutic issues regarding the anxiolytic effects of some angiotensin converting enzyme inhibitors used primarily for hypertension, such as captopril. Also, it seems that oxidative stress could play an important part in these actions.

Open access

Ovidiu Alexinschi, Roxana Chirita, Alin Ciobica, Padurariu Manuela, Romeo Dobrin, Raluca Prepelita, Ionela Lacramioara Serban and Vasile Chirita

Abstract

Background: Although it is generally accepted that there is an increased oxidative stress status in alcoholics, the separate relevance of oxidative stress following alcohol withdrawal is still not understood to this date. There are reports stating that the increased oxidative stress status in alcoholics may persist independently of the constant presence of alcohol intake, while on the other side, it was demonstrated that the antioxidant defense mechanism could significantly increase after alcohol withdrawal.

Methods: In the present work, we were interested in studying the relevance of oxidative stress status in the alcohol withdrawal processes, by determining some oxidative stress markers (two antioxidant enzymes: superoxide dismutase - SOD and glutathione peroxidase - GPX and a lipid peroxidation maker - MDA) after one week and one month of abstinence, as compared to the baseline and a control group of subjects.

Results: Our data confirmed the increased oxidative stress status in alcoholic patients and, more importantly, we de m - onstrated here a significant decrease of the oxidative stress status one week and one month following the withdrawal, as showed by a significant increase in the specific activity of SOD (p<0.003), as well as by a decrease in MDA levels (p<0.019). Still, in the case of all three markers of oxidative stress status which we determined, the levels after one week or one month of abstinence were significantly altered when compared to controls.

Conclusions: This suggests that severe and prolonged deficiency in the oxidative stress marker levels needs longer than one month of abstinence to normalize.

Open access

Florin Petrariu, Ovidiu Alexinschi, Roxana Chirita, Vasile Chirita, Alin Ciobica, Manuela Padurariu, Radu Lefter, Romeo Dobrin, Radu Popescu, Emil Anton, Oana Arcan and Daniel Timofte

Abstract

While the exact relevance of the oxidative stress markers after the complex processes of alcohol withdrawal is still controversial, in the present report we were interested in studying the relevance of oxidative stress status in the alcohol withdrawal processes, by determining some oxidative stress markers after 3, 6 and 12 months of abstinence. 62 patients were selected, all of them males. Thus, 33 (baseline), 14 (3 months), 14 (6 months) and 15 (12 months) patients, while the control group (n=32) included healthy, sex and aged-matched subjects. Regarding superoxid dismutase, we observed a significant group difference (p<0.0001), together with an increase in all 3 cases of time-abstinence, as compared to baseline results: (p<0.0001-3 months), (p<0.0001-6 months) and (p<0.0001- 12 months). Also for glutathione peroxidase, we observed a significant overall effect of the abstinence in our groups (p=0.0003), plus an increase especially at 6 months (p=0.03) and 12 months (p=0.006). Regarding malondialdehyde, as a main marker for the lipid peroxidation processes, we found significant differences between our groups (p<0.0001), together with a decrease in all 3 cases, compared to the baseline group (p=0.003), (p=0.01) and (p=0.0002). In conclusion, this confirms the increased oxidative stress status in alcoholic patients and even more importantly, we showed that there is a significant and progressive decrease in the oxidative stress status at 3, 6 and 12 months after the withdrawal process, as demonstrated by the increased levels of antioxidant enzymes and decreased rate of lipid peroxidation, when compared to baseline values.