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Biomedical subjects

R P Kucherenko

Publications and source records attributed to R P Kucherenko.

At least 19 recordsLinked to original sources
PubMed1995

[The participation of the serotonin link in the neurochemical mechanism of transcranial electroanalgesia].

Metergoline and 5, 7-dihydroxytryptamine were found to suppress and to prevent an electroanalgesic effect, resp. An increase in the serotonine contents in the CSF after electroanalgesia suggests an activation of the brain serotoninergic system. DL-5-hydroxytryptophan and allopurinol enhanced the electroanalgetic effect. The data obtained suggests an existence of a serotoninergic component of the transcranial electroanalgesia mechanism.

Animals↗
PubMed1990

[Ultrastructure of the parietal region of the brain after selective damage of the serotoninergic system].

The selective lesion of the afferent serotoninergic system by means of intracisternal administration of 5,7-dihydroxytryptamine produces certain structural rearrangements in a part of cellular elements and in various parts of the neuropil of the neocortical parietal area. The deficiency of serotoninergic innervation influences the metabolic processes. This is evident from the change in the structure of protein synthesizing apparatus in a number of postsynaptic neurons. It is possible that the structural rearrangements observed in the serotoninergic and in the conjugated to it mediatory systems make the base of functional disorders in the neocortex and are accompanied with certain changes in the integrative activity of the brain.

5,7-Dihydroxytryptamine↗
PubMed1990

[Ultrastructure of the serotoninergic system of the motor area of the cerebral cortex].

Owing to the microscopical investigation, using selective neurotoxin 5,7-dihydroxytryptamine, it has been possible to reveal the serotoninergic system and targets of its innervation in the rat cerebral cortex motor area. The serotoninergic axonal varicosities and synaptic boutons are present in all layers of the neocortex. Their large amount is revealed in the I and II layers. The terminals form contacts with dendrites of small size, sometimes they terminate on the head of the spines, as well as on bodies of neurons in different layers. According to their position and ultrastructural organization these neurons are, perhaps, pyramidal, that is glutamatergic, and those less in their size--refer to interneurons and can be GABAergic ones. Basing on own data and those of the literature, concerning the existence of nonsynaptic link for transmission of serotoninergic effects, a conclusion is made that a coordinating functioning of the synaptic and non-synaptic intercellular integrative mechanisms ensure a wide range of functions of the serotoninergic system in the cerebral cortex.

5,7-Dihydroxytryptamine↗
PubMed1989

[The role of the neurons of the locus coeruleus and ventral tegmental area in the development of catecholamine-deficient conditions].

Selective neurotoxic effect of 6-hydroxydopamine on the catecholaminergic systems was used to study the structural changes in the locus coeruleus and ventral tegmental neurons. Compared with the earlier published data on the blood-brain barrier permeability, the peculiarities of the responses of a part of neurons and synapses of the sites under study suggest that this selective catecholaminergic systems lesion leads to a decrease in their influence on the brain structures innervated. This causes impairment of inter-neurotransmitter relations and provide a morphological basis of various functional CNS shifts.

Animals↗
PubMed1988

[Effect of 5,7-dihydroxytryptamine on pain sensitivity and analgesic activity of morphine].

Electron microscopy of rats ultrathin sections from dorsal and central raphe nucleus and spinal cord after 5,7-dihydroxytryptamine intracisternal microinjection (200 micrograms) has revealed neurones and axonal terminals distruction, which associated with tail-flick hypoalgesia and blood pressure nociceptive reactions diminished. In this condition the morphine (2 mg/kg) analgesia and drug depressive effect on pain hemodynamic manifestations increase significantly.

5,7-Dihydroxytryptamine↗
PubMed1987

[Morphological restructuring of the cellular elements of the ventral tegmental area in selective damage to the catecholaminergic systems of the brain].

Electron microscopical investigation of the ventral tegmental area at various time after administration of a specific neurotoxin 6-hydroxydopamine made it possible not only to reveal catecholamine reactive elements, but also those structural reorganizations in them, that are dependent on the lesion of the catecholaminergic systems, including certain changes in the receptor apparatus. Dark neurons with the change of different organelles preserve for a long time, up to 2.5 months. Reactive and destructive reorganizations of some axons, terminal buttons and postsynaptic poles of the ventral tegmental area are accompanied with certain functional disturbances, observed both experimentally and at a pathological process. The results of the work demonstrate that under conditions of the model experiments there is a possibility to study various stages of pathogenesis of a number of nervous-psychical diseases, connected or accompanied with disorders in certain mediator systems.

Animals↗
PubMed1985

[Ultrastructure of cells of the lateral field of the hypothalamus of the cat after exposure to electromagnetic radiation].

Under the effect of electromagnetic radiation not any specific changes are revealed in the neural system unequivocally characterizing disturbances in its structure as a result of an excess absorption of electromagnetic energy. The ultrastructural changes revealed in the lateral fields of the cat hypothalamus are suitable for a well known scheme demonstrating the course of the pathological process, where three phases are distinguished: reactive, destructive and restorative. The pathological process develops gradually. The reactive changes in neurons and synapses, observed immediately after withdrawal of the electromagnetic action. increase during the following three months and result in coarse destructive disorders and in death of some neurons and synapses. In 6 months certain signs of restoration of the structures are observed. Under the effect of electromagnetic radiation water redistribution between the structures takes place, the sympathetic terminals loosing their fluid. Thus, certain conditions are produced for sticking together the synaptic vesicles. Possibly that deficiency of Ca++ ions contributes to it.

Animals↗
PubMed1984

[Morphological restructurings in the brain due to a decrease in the catecholamine level].

Using light and electron microscopic examinations, the authors studied various portions of the rat brain following intracysternal administration of 6-hydroxydopamine. The lowered levels of noradrenaline in the cerebral tissue and an altered ultrastructure of neurons of the catecholaminergic centres and their processes were discovered in various areas of the brain. The time-course and the pattern of these readjustments may serve as a model for the investigation of the etiopathogenesis of various mental diseases and the elaboration of the methods of their pharmacotherapy.

Animals↗
PubMed1983

[Structure of the terminal portions of the monoaminergic afferent system in the parietal area of the rat cerebral cortex].

Construction and layer-by-layer distribution of catecholaminergic structures in the rat cortical parietal area have been studied electron microscopically. The method of 6-hydroxydopamine (6-OH-DA)-induced chemical rearrangements in the monoaminergic cerebral systems has been used. The intracisternal administration of 6-OH-DA (300 mcg) produces certain structural rearrangements in axons, their terminals and dendrites situating mainly in layers I, II, V and VI; within their limits the structural rearrangements are distributed unevenly. The catecholaminergic structures organization revealed is considered as a morphological base of varied functions of these systems.

Afferent Pathways↗
PubMed1978

[Subcellular reaction to cerebral hypoxia].

Compensatory-adaptive reaction of the brain to hypoxia depends on destructive and reparative processes developing in neuronal and glial elements. A drastic tension and reconstruction of the energy apparatus--mitochondria occurs, as well as reversible disturbances in informative connections between the nucleus and cytoplasm and between nerve fibers and synapses. As a result, structural-functional activity of organells decreases along with changes in metabolic processes. Destructive processes in oligodendroglia, at all stages of the experiment, are more pronounced than in neurons. Preliminary injection of hydroxybutyric acid to the animals preserves the cellular energy potential under hypoxia, that is evident from the lack of severe alterations in mitochondria and other organells. Mechanisms of the adaptive-compensatory reaction in cortical neurons under hypoxia are connected with tension and reconstruction of all organells of the brain cellular elements and with biochemical shifts of lactate dehydrogenase enzymes.

Adenosine Triphosphatases↗
PubMed1978

[Effect of L-dopa on the catecholamine content and myocardial ultrastructure and contractility in heart surgery].

The fluorometric and histochemical methods of the catecholamines contents determination and electronic microscopy of the ultrastructure were used in the examination of myocardium biopsy preparations. The heart operations were followed with the decrease of catecholamines contents in the myocardium and disorder of the mitochondria ultrastructure. The l-DOPA injection resulted in the increase of the myocardium contractile ability before the operation, but did not prevent from its decrease in the postoperative period. The postoperative l-DOPA administration combined with digitalis, according to the described scheme, contributed to the preservation of the myocardium contractile ability at the optimal level.

Animals↗
PubMed1977

[Adaptive-compensatory reaction of the brain to irradiation].

In totally irradiated chick and rat embryos, young chicks and rats structural functional activity of the subcellular reparative processes in the brain cortex was studied. The animals were given an irradiation dose of 600 and 1,200 rad. In embryo-genesis and in early postnatal period, the adaptive compensatory response in shown after X-ray irradiation to be characterized by subcellular changes and organell hypertrophy of the neurons in the CNS accompanied by disturbances in metabolic and synthesis processes. Ultrastructural regeneration goes side by side with the destructive processes in them.

Adaptation, Physiological↗