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S B Seredenin

Publications and source records attributed to S B Seredenin.

At least 19 recordsLinked to original sources
PubMed2006

Emotionality and the temporospatial organization of instantaneous EEG potentials.

The characteristics of the temporospatial organization of cerebral cortical potentials at different levels of genetically determined emotionality were analyzed by constructing topograms of instantaneous EEG levels in the inbred rat strains MR and MNRA. Two parameters were calculated for each topogram: the total level and the similarity coefficient. Power spectra were calculated for the values and these were found to change in an oscillatory manner. Interstrain differences were found in the correlated changes in total levels and similarity coefficients, in the durations of changes in the total level, which were more marked than those of similarity coefficients, and the nature of interhemisphere asymmetry. In MR rats, the power spectra of both measures showed significant peaks with modes at 2.0, 6.5, and 9.0 Hz. In MNRA rats, peaks in the spectra of these measures both coincided (2.0 Hz) and differed (7.0 Hz in the spectrum of the total level and 3.0, 4.5, and 6.0 Hz in the spectrum of the similarity coefficient). These data suggest different types of functioning of the reticulothalamocortical and hippocampocortical systems in rats of these strains.

Animals↗
PubMed2006

[Cytosine demethylation in the tyrosine hydroxylase gene promoter in the hypothalamus cells of the rat brain under the action of an aminoadamantane derivative Ladasten].

In our previous study of mechanisms of pharmacological activity of a derivative of 2-aminoadamantane, Ladasten, we have shown more than a twofold increase in the mRNA level of the tyrosine hydroxylase (TH) gene in the rat brain hypothalamus 1.5-2 h after a single administration of this substance. In the present study, we employed the bisulfate sequencing technique to detect changes of GpG islands methylation status in the TH gene 5'-flanking region (-650 + 84) in hypothalamus cells of control and experimental rats after a single exposure to Ladasten. Ladasten was shown to increase frequency of cytosine demethylation in binding sites of some transcription factors or in neighboring motifs. It is suggested that the Ladasten-induced increase of TH gene transcriptional activity in rat hypothalamus is associated with cytosine demethylation in CpG islands in some regulatory gene elements.

Adamantane↗
PubMed2005

Neuroprotective properties of afobazol in vitro.

The effects of a novel selective anxiolytic afobazol on survival of HT-22 neurons were studied in the model of oxidative stress and glutamate toxicity. In both models, the neuroprotective effect of afobazol was established.

Animals↗
PubMed2005

Neuroprotective effects of afobazol in experimental cerebral hemorrhage.

The study of novel selective anxiolytic afobazol on rats with experimental intracerebral post-traumatic hematoma (cerebral hemorrhage) demonstrated its efficiency in a dose of 5 mg/kg applied by a single or repeated administration for 2 weeks. The preparation significantly decreased the incidence of neurological disturbances in most rats (pareses, paralyses, convulsive movements, lateral posture). The therapeutic course of afobazol improved survival rate. Afobazol improved learning and memory in rats with cerebral hemorrhage in the conditioned passive avoidance test and positively affected motor activity in the open field test, which was documented by significant increase in total motor activity indices. The effects of afobazol were more pronounced after course treatment.

Animals↗
PubMed2003

Pharmacological activity of phenazepam and flunitrazepam in ultralow doses.

Experiments on male outbred albino rats showed that benzodiazepine tranquilizers phenazepam and flunitrazepam in ultralow doses (10(-9)-10(-15) mol/kg) produced an anxiolytic effect in the conflict situation test. This effect was not accompanied by myorelaxing and sedative side effects typical of standard doses of tranquilizers.

Animals↗
PubMed2003

Effects of phenazepam in ultralow doses on bioelectric activity of the brain and behavior of rats in various models of anxiety.

Phenazepam in ultralow doses produced an anxiolytic effect on male outbred albino rats in the conflict situation and elevated plus-maze models and inhibited theta-activity in EEG, which is typical of tranquilizers. As differentiated from standard doses, phenazepam in this concentration did not affect other frequency bands. Our results suggest that phenazepam in ultralow doses acts as the anxioselective tranquilizer.

Animals↗
PubMed2003

Pharmacogenetic study of anxiolytic effects of new cholecystokinin receptor antagonists in animals with different levels of emotionality.

Effects of two new peptide antagonists of central cholecystokinin receptors, GB-101 (0.05-0.40 mg/kg) and GB-115 (0.006-0.100 mg/kg), on the behavior of inbred animals differing by the reactions to emotional stress were studied in standard tests for evaluation of tranquilizers. The test drugs dose-dependently increased the total locomotor activity in the open field test in Balb/c mice and had no effect on the behavior of C57Bl/6 mice. GB-101 (0.4 mg/kg) and GB-115 (0.025 and 0.05 mg/kg) produced an anxiolytic effect on MR rats (but not on MNRA rats) in the elevated plus-maze and conflict tests. These data confirm anxioselective effects of the test compounds.

Animals↗
PubMed2003

Selank and short peptides of the tuftsin family in the regulation of adaptive behavior in stress.

White laboratory male rats, inbred male C57BL/6 and Balb/c mice, and male Wistar rats, all previously divided on the basis of the type of emotional reactivity, were used to compare the effects of ten peptide compounds of the tuftsin family and Selank on the behavioral manifestations of emotional stress created by a conflict situation. Peptides were shown to have positive emotional effects and antistress actions. Individual physiologically significant effects were seen, due to the molecular structures of the study peptides and/or their degradation fragments. The results demonstrate the potential for the synthesis of peptide compounds with predictable directions of pharmacological actions and safe for wide use.

Adaptation, Psychological↗
PubMed2002

Endogenous dipeptide cycloprolylglycine shows selective anxiolytic activity in animals with manifest fear reaction.

Experiments on two mouse strains with opposite reactions to emotional stress showed selectivity of the anxiolytic effect of endogenous dipeptide cycloprolylglycine. In the open field test cycloprolylglycine (0.01-0.10 mg/kg intraperitoneally) dose-dependently (1.8-2.1-fold) increased motor activity of BALB/c mice with manifest fear reaction and had no effect on C57Bl/6 mice with active behavior. The content of endogenous cycloprolylglycine in mouse brain correlated with the type of emotional stress reaction: its content in the brain of C57Bl/6 mice 1.5 times surpassed that in BALB/c mice. It is concluded that cycloprolylglycine is involved in the endogenous regulation of fear reaction.

Animals↗
PubMed2002

[Selank and short peptides of Taftsin derivatives in regulation of adaptive behavior of animals in stress].

Effects of 10 peptides, tuftsin and Selank derivatives upon behavior during emotional stress induced by conflict situation, were studied in Balb/c and C57BL/6 male mice with genetically determined opposite types of emotional stress reaction, in white male mice and in Wistar male rats divided into different groups according to the type of emotional reactivity. Positive effects of some peptides upon the adaptive behavior of animals in stress situation were demonstrated. Individual physiologically important effects depending on molecular structure of the peptides under study and/or their fragments, possible products of degradation, were revealed. The results obtained confirm the perspectives of aimed synthesis of peptides with definite pharmacological activity, which are not ksenobiotics and will have no side effects.

Adaptation, Psychological↗
PubMed2001

Proline-containing dipeptide GVS-111 retains nootropic activity after oral administration.

Experiments on rats trained passive avoidance task showed that N-phenyl-acetyl-L-prolyl-glycyl ethyl ester, peptide analog of piracetam (GVS-111, Noopept) after oral administration retained antiamnesic activity previously observed after its parenteral administration. Effective doses were 0.5-10 mg/kg. Experiments on a specially-developed model of active avoidance (massive one-session learning schedule) showed that GVS-111 stimulated one-session learning after single administration, while after repeated administration it increased the number of successful learners among those animals who failed after initial training. In this respect, GVS-111 principally differs from its main metabolite cycloprolylglycine and standard nootropic piracetam.

Administration, Oral↗
PubMed2001

Anxiolytic activity of endogenous nootropic dipeptide cycloprolylglycine in elevated plus-maze test.

Testing in an elevated plus-maze revealed dose-dependent anxiolytic activity of piracetam analog cycloprolylglycine. Intraperitoneal injection of this agent (0.05 mg/kg) 9-fold prolonged the time spent in open arms compared to the control, without affecting the total motor activity. This effect was stereo-selective: D-enantiomer in doses of 0.05 and 0.1 mg/kg was inactive. Therefore, cycloprolylglycine is similar to piracetam in not only nootropic, but also anxiolytic activity. The existence of an endogenous system responsible for the co-regulation of memory and anxiety is hypothesized.

Animals↗
PubMed2000

Multidimensional assessment of differences in monoamine metabolism in C57BL/6 and BALB/c mice.

Monoamine metabolism in the hypothalamus and striatum of BALB/c and C57Bl/6 mice (intact and stressed in the open field test) was studied using single- and multidimensional statistical methods. It is suggested that the revealed difference in neurotransmitter metabolism is associated with genetically controlled behavior of these animals under conditions of emotional stress. The results of discriminant analysis suggest that the regulation of monoamine metabolism during emotional stress is genetically determined.

Animals↗