Tag Archives: superoxide-anion-radical
Role of AP-1 transcriptional factor in development of oxidative and nitrosative stress in periodontal tissues during systemic inflammatory response
A. M. Yelins’ka, O. Ye. Akimov, V. O. Kostenko
Ukrainian Medical Stomatological Academy, Poltava, Ukraine;
e-mail: riseofrevan5@gmail.com
Received: 04 August 2018; Accepted: 13 December 2018
Chronic systemic inflammatory response syndrome (SIRS) underlies many diseases (sepsis, atherosclerosis, diabetes mellitus). According to research data of recent years the key role in the development of SIRS is played by the activation of various nuclear transcription factors. The work was aimed at studying the role of such transcription factor as activator protein 1 (AP-1) in the development of oxidative and nitrosative stress in soft periodontal tissues during chronic systemic inflammatory response (SIRS). The experiment was carried out on 24 the Wistar rats. We induced SIRS by bacterial lipopolysaccharide of Salmonella typhi (0.4 μg/kg) intraperitoneal injection. We studied changes in the functioning of the nitric oxide (NO) cycle, the production of superoxide anion radical (O2•-) and the activity of antioxidant enzymes in soft periodontal tissues homogenate. We used SR11302 as an Ap-1 inhibitor (15 mg/kg) for 2 months. We established that during the SIRS modeling, the activity of antioxidant enzymes in soft periodontal tissues decreased with a simultaneous increase in the production of O2•-. SIRS elevated the production of NO by inducible NO-synthase (iNOS) and nitrite reductases. The nonoxidative cleavage of L-arginine under this condition was also increased. The concentration of peroxynitrite (ONOO–) was shown to be elevated more than 2-fold. The inhibition of AP-1 by SR11302 normalized the functional state of the NO cycle, reduced O2•- production and restored the activity of antioxidant enzymes. In this way, under SIRS conditions, “vicious circle” of ONOO– formation is formed. SIRS in soft periodontal tissues poses a threat of oxidative and nitrosative stress development. Usage of AP-1 activation inhibitor SR11302 breaks “vicious circle” of ONOO– formation.
Antioxidant activity of melatonin and glutathione interacting with hydroxyl- and superoxide anion radicals
T. Y. Kuznetsova1, N. V. Solovyova2, V. V. Solovyov1, V. O. Kostenko2
1Yu.Kondratyuk Poltava National Technical University, Ukraine;
2Ukrainian Medical Stomatological Academy, Poltava;
e-mail: kzt7@ukr.net
Based on the analysis of the results obtained by quantum chemical modeling of interaction between reduced glutathione (GSH) and melatonin (MLT) molecules with oxygen radicals (•OH and • OOˉ) it was found that this interaction occured following the acid-base mechanism, where MLT and GSH acted as a base in respect of •OH, and as acid in respect of •OOˉ. We have carried out the correlation of the results of quantum chemical calculations (density redistribution, energetic characteristics) under the interaction of MLT and GSH molecules with •OH and •OOˉ in changing macroscopic properties of the process of electroreduction of free oxygen radicals in the presence of antioxidants (potential and maximal current wave reduction waves). This was a direct experimental macroscale evidence of the results of theoretical modeling at the nanoscale level that pointed to a marked antioxidant activity of glutathione compared with melatonin.
Generation of superoxide anion-radical in the liver monooxygenase system of preliminary radiation-exposed tumor-bearing rats
М. М. Marchenko, O. V. Ketsa
Yuriy Fedkovych Chernivtsi National University, Ukraine;
e-mail: ketsa80@mail.ru
Generation of superoxide anion-radical (O2•-) in reductase and oxygenase electron-transport chains in the liver monooxygenase system was investigated in tumor-bearing rats exposed to preliminary irradiation. Preliminary irradiation of rats (before transplantation of Guerin’s carcinoma) resulted in the increased generation of superoxide anion-radical by components of the liver monooxygenase system in the logarithmic phase of oncogenesis.
It is shown that the increased NADPH-cytochrome P-450 reductase activity is accompanied with the intensification of superoxide anion-radical generation in liver microsomal fraction of preliminary radiation-exposed rats. At the same time the cytochrome P-450 hydroxylase activity in the microsomal fraction of tumor-bearing rats subjected to preliminary irradiation was decreased.
Quantum chemical modeling of antioxidant activity of glutathione interacting with hydroxyl- and superoxide anion radicals
N. V. Solovyova1, T. Y. Kuznetsova2
1Higher State Medical Educational Institution of Ukraine,
Ukrainian Medical Stomatological Academy, Poltava, Ukraine;
2Yu. Kondratyuk Poltava National Technical University, Ukraine;
e-mail: KZT7@yandex.ru
Following the analysis of the results of quantum chemical simulation of interaction between a GSH molecule and oxygen radicals •ОН and •ООˉ, it was found that it takes place through the acid-base mechanism, where GSH acts as a base towards •ОН, and as an acid towards •ООˉ. The results of quantum chemical calculations (electron density redistribution, energy characteristics) were correlated at the time of interaction of a GSH molecule with •ОН and •ООˉ with a change of macroscopic parameters of the process of free oxygen radical electroreduction in the presence of GSH (potential and maximum current of reduction waves), which is a direct experimental macroscale evidence of results of the conducted nanoscale theoretical simulation.