[Morphochemical characteristics of hippocampal neuron's response to the hypofunction of the dopaminergic system].

Differences in the response of August rats' hippocampal field СА1 and СА3 neurons to the chronic haloperidol administration (a model of parkinsonism) were revealed by interferometric methods. Based on the morphochemical parameters (nuclear and cytoplasmic area, protein content and concentration), the changes of field СА1 neurons can be regarded as functionally active (all parameters are significantly higher than in controls), and those of field СА3 neurons - as initial stages of degeneration (the significant decrease of neuron sizes). The differences in the response found in this study can be associated with the functional characteristics of СА1 and СА3 fields.

Morphochemical characteristics of hippocampal neurons in rats with different behavioral parameters.

The hippocampus (CA3 field) was studied in rats with different behavioral characteristics. Protein contents in the neuronal cytoplasm and nuclei, as well as the size of neurons in animals predisposed to stress, poorly trained in a shuttle box, and exhibiting low locomotor activity in the open field were lower than in rats resistant to stress and characterized by high learning capacity and locomotor activity. Our results suggest that neuronal differences in the hippocampal CA3 field are associated with variations in learning capacity of animals.

Morphochemical study of hippocampus of august rats after systemic treatment with amphetamine followed by injection of delta sleep-inducing peptide.

Quantitative interferometry showed that chronic amphetamine administration to August rats (2.5 mg/kg/day for 3 weeks) increased the area of neuronal cytoplasm and nuclei and content and concentrations of proteins in hippocampal CA3 neurons. These changes persisted after single injection of delta sleep-inducing peptide (60 microg/kg). The reaction of the entire neuronal population of hippocampal CA3 neurons to amphetamine is similar.

[Morphochemical characteristic of rat brain structures after exposure to delta-sleep inducing peptide following long-term amphetamine administration]. / Morfokhimicheskaia kharakteristika struktur mozga krys posle vozdeistviia del'ta-son indutsiruiushchego peptida na fone khronicheskogo vvedeniia amfetamina.

The aim of this work, that was carried out using Wistar rats, was to characterize the response of neurons of different morphofunctional types to amphetamine administration and to study the possibility of correction of these changes by delta-sleep inducing peptide (DSIP). Single intraperitoneal injection of 60 microg/kg of DSIP following a long term amphetamine administration (2.5 mg/kg for 3 weeks) was shown to result in normalization of brain metabolism, that was disturbed by the drug. The correcting DSIP effect was found in rat brain structures judging by the parameters of the state of proteins in neurons of sensomotor cortex and caudate nucleus and by the activity of enzymes of neurotransmitter metabolism, such as type A and B monoamine oxidases and acetylcholine esterase, that was determined in subfractions of the same brain structures. DSIP modulating effect in phenamine stereotypy supports its role as an adaptogen of intercenter relations in CNS pathology.

[Morphochemical analysis of hippocampus of rats predisposed (August) or resistant (Wistar) to emotional stress]. / Morfokhimicheskie razlichiia gippokampa krys, predraspolozhennykh (Avgust) i ustoichivykh (Vistar) k émotsional'nomu stressu.

The aim of this work was the comparative cytochemical study of some parameters of neurotransmitter and protein metabolism in the hippocampus (CA3 field) of August and Wistar rats, which were used as genetic-functional models demonstrating different brain organization, in particular, in respect to an emotional stress. Using quantitative cytochemical methods it was demonstrated that the activities of aminopeptidase, monoaminooxidase (substrates--tryptamine and serotonin), and glutamate dehydrogenase, were lower in the hippocampus of August rats (predisposed to emotional stress) as compared to that one in Wistar rats (resistant to emotional stress). August rats were also characterized by smaller sizes of neuronal cytoplasm and nuclei and by their lower protein content and concentration. The analysis of the data obtained has shown the existence of neurons with different modalities within the limits of CA3 hippocampal field, and these characteristics are thought to define the morphochemical differences in the hippocampus (CA3 field) of genetically different rats.

[Influence of L-DOPA on rat brain depending on individual behavioral features]. / Vliianie L-DOFA na mozg v zavisimosti ot individual'nykh osobennostei povedeniia.

To cause brain dopaminergic hyperactivity in rats, L-DOPA was injected in August and Wistar rats with different basic stress reactivity and motor activity in open field ecperiments during 14 days. L-DOPA was used in the form of the drug madopar in dosage of 25,5 mg/kg of body mass daily. The indices of activity of metabolism enzymes, neuromediators and proteins: aminopeptidase, glutamatedehydrogenase, monoaminoxidase (substrate triptamine) and acetylcholinesterase were studied in sensomotor cortex, caudate nucleus, nucleus accumbens and hippocampus region. The intra- and between-line features of L-DOPA influence on rat brain have been found, being mostly pronounced in the animals with low motor activity. In these rats, changes were observed in all structures and for all enzymes, but in the group with high activity they concerned only GDH in caudate nucleus and nucleus accumbens. Hippocampus was the structure reacting to L-DOPA most actively as shoun by cytochemical indices, with reactions relating mainly to serotonergic system in August rats and to acetylcholinergic and glutamatergic systems in Wistar rats. The results demonstrate an essential role of genetically determined reactivity and motor activity in individual prognosis of resistance to stress and extreme situations.

[Role of morpho-chemical plasticity in the genetic-functional organization of the brain in animals]. / Rol' morfokhimicheskoi plastichnosti v genetiko-funktsional'noi organizatsii mozga zhivotnykh.

Quantitative cytochemistry has revealed that emotional stress-sensitive rats (August) differ from emotional stress-resistant ones (Wistar) in the exchange of neurotransmitters and in the level of protein in the neurons. The differences were found at the level of some brain regions (sensomotor cortex, hippocamp, caudate and adjacent nuclei) and various cells (neurons of the cortex and subcortical structures). It has been concluded that animals of genetically different lines differ not only in behavioral characteristics, but in metabolism in some brain structures.

[The role of neuromediators and proteins in genetic and functional organization of animal brain]. / Rol' neiromediatorov i belkov v genetiko-funktsional'noi organizatsii mozga zhivotnykh.

It was shown that animals that differ in behavioral characteristics (August and Wistar rats) also differ in neurotransmitter and protein metabolism, which can be considered as tests that adequately reflect the functional condition of the central nervous system. These differences are expressed at the level of both subcortical structures (hippocampus and caudate nucleus) and various morphofunctional types of the sensorimotor cortex neurons (layers III and V). Studies on genetically different animals strains have revealed metabolic features that allow determination of individual behavioral features and estimation of individual brain structures in these processes.

Postresuscitation changes in neuronal hippocampal populations in rats with different learning ability.

The state of pyramidal cell populations in CA1 and CA4 hippocampal fields was studied in resuscitated and intact rats with different learning ability. Morphometry showed that postresuscitation damage to neurons was more pronounced in good learners compared to poor learners. Interferometry revealed higher protein content in neurons in poor learners compared to successfully trained rats. It was hypothesized that different neuronal resistance to ischemia in rats characterized by different learning ability is determined by some peculiarities in protein metabolism preexisting in intact animals and manifesting in the postresuscitation period.

Morphochemical features of plastic rearrangements of hippocampal neurons after rhythmic stimulation of the limbs in elderly rabbits.

The process of aging is accompanied by significant derangements to brain function, which are expressed particularly as the well-known phenomenon of memory disturbance [4,5]. Since memory functions are based on plastic rearrangements, in which the key role is played by metabolic processes, we elected to study the interactions between nerve cell activity and the state of protein biosynthesis during the formation of temporal associations in animals of different ages [3]. An interferometric method was considered appropriate in this regard as a method for estimating the dry weight of the cytoplasm and nucleus in neurons; this serves as a measure of their protein contents [1,2]. The aim of the present work was to identify the relationship between the process of impressing the assimilation trace of a rhythm during the acquisition of an analog of a conditioned reflex to time in hippocampal neurons and their morphochemical parameters in elderly rabbits.

[Response of sensorimotor cortex neurons to weak disturbances of the magnetic field in Wistar rats. Cytochemical study]. / Reaktsiia neironov sensomotornoi kory krys linii Wistar na slaboe vozmushchenie magnitnogo polia. Tsitokhimicheskoe issledovanie.

The influence of weak disturbances (up to 300 microT) of natural magnetic field on the protein metabolism in neurons of sensomotor cortex (layers III and V) in Wistar rats upon learning in a complex maze was studied. It was found that sensomotor neurons were very sensitive to weak disturbances of magnetic field. The protein content increased, while the nucleus-cytoplasm ratio and osmotic state of neurons remained unchanged. The specificity of neuron's reaction manifested itself in a sharp increase of nucleus and cytoplasm dimensions. In associative neurons (layer III), both the nucleus and cytoplasm were involved in the response; in efferent neurons (layer V), only nuclear parameters changed. The variance coefficients of all parameters of protein metabolism in sensomotor neurons, independently of their functional properties, were much higher than in control, which resulted in a wide diversity of cytochemical response.

Neurochemical characteristics of the effects of delta sleep-inducing peptide in Wistar rats with hyperactivity of the dopaminergic system.

Quantitative cytochemical assay showed that single injection of delta sleep-inducing peptide increased monoamine oxidase activity (substrates: serotonin and tryptamine) in the caudate and accumbens nuclei and glutamate dehydrogenase activity in the hippocampus of stress-resistant Wistar rats chronically treated with L-DOPA. Enzyme activities in the sensorimotor cortex did not change. Delta sleep-inducing peptide had no effects on acetylcholine esterase and aminopeptidase activities in the brain of Wistar rats.

[The experimental development of the concept of O. S. Adrianov on the correlation of functional and neurochemical processes: regulatory peptides in mediator system dysfunction]. / Eksperimental'noe razvitie kontseptsii O. S. Adrianova o sootnoshenii funktsional'nykh i neirokhimicheskikh protsessov: reguliatornye peptidy pri disfunktsii mediatornykh sistem.

The article is devoted to commemoration of full member of Russian Academy of Medical Sciences, Oleg Andreevich Adrianov, who would have celebrated his 75-th anniversary in 1998. O. S. Adrianov, author of numerous works on physiology and morphology of central nervous system, in the recent years of his was studying the problem of the processes relationship at macro and micro levels of brain organization. Further to the concept created by O.S. Adrianov, data on action of two peptides: delta-sleep and tafcine, on behavior, neurophysiological and neurochemical processes have been consolidated. Experimental data were obtained for rabbits, cats, and dogs, both intact and in the state of pathology (psychomotoric excitement, bradykinesia, penicillin epilepsy). Impact of peptides on convergation processes is discussed: peptide of delta-sleep depresses reactions of brain structures to photo- and phono-stimulation, and activates the serotoninergic system in general; tafcine enforces the convergation processes and activates the dopaminergic system.

[The neurochemical and behavioral indices of an acquired alcohol craving in rats under conditions of information loading]. / Neirokhimicheskie i povedencheskie pokazateli priobretennogo vlecheniia k alkogoliu u krys v usloviiakh informatsionnykh nagruzok.

The state of neurotransmitter systems was studied in the groups of Wistar rats discriminated by striving for alcohol and rejecting it after the information load (alimentary instrumental conditioning in a labyrinth). The specific activities of neurotransmitter metabolizing enzymes (MAO A and B, acetylcholinesterase, and acetylcholinetransferase) and the content of biogenic amines and their metabolites (serotonin, 5-hydroxyindoleacetic acid, noradrenaline, and dopamine) were measured in homogenates and subfractions of sensorimotor cortex and caudate nucleus. It was found out that the biochemical indices correlated with cognitive abilities of animals. Stress-resistant rats, which were capable for acquisition of the complex skill, refused alcohol after the information load and were characterized by activation of the brain neurotransmitter systems. The rats, which were unable to fulfill the cognitive task, began to abuse alcohol and were characterized by suppression of the neurotransmitter systems. It seems possible that the brain neurotransmitter metabolism adequately reflects the characteristics of the higher nervous activity of animals and their resistance to alcohol.

Regulation by delta-sleep-inducing peptide of the neurochemical changes in the brain associated with dopaminergic system hyperactivity.

The influence of a single injection of "delta-sleep-inducing peptide" (DSIP; 30 microg/kg body weight) on neurochemical parameters of rats' brain was studied under the conditions of chronic administration of dopamine analogs inducing DA-system hyperactivity - 50 mg/kg body weight of L-DOPA for 30 days or 2,5 mg/kg body weight of amphetamine for 21 days. The parameters of serotonergic system (MAO A activity, 5-HT, and 5-HIAA contents) and of dopaminergic system (MAO B activity, DA, NA, and HVA contents) were investigated in the cortex and caudate nucleus of control, DA or amphetamine, and DSIP receiving rats. Changes caused by the two DA-system activating drugs had both similarities and differences, and the corrective action of DSIP also had certain peculiarities depending on the pharmacological preparation used for the induction of DA-system hyperactivity and on the investigated brain structure. It is supposed that DSIP action might be based on the activation of serotonergic system that ensures the adaptive behavior of the animals.

[The morphochemical characteristics and plastic restructurings of the hippocampal neurons after rhythmic stimulation of an extremity in old rabbits]. / Morfokhimicheskie osobennosti i plasticheskie perestroiki gippokampal'nykh neironov posle ritmicheskoi stimuliatsii konechnosti u starykh krolikov.

The rhythmic activity of CA1 hippocampal neurons was studied after the rhythmic (1-2 Hz) electrocutaneous forelimb stimulation (10-20 min) of 6-84-months-old rabbits. The spectral analysis of neuronal activity revealed the age-dependent decrease in ability to reproduce the rhythm of stimulation. The cytochemical data showed that the protein synthesis in the neurons under study also declined with age.