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Biomedical subjects

E V Vasil'eva

Publications and source records attributed to E V Vasil'eva.

At least 19 recordsLinked to original sources
PubMed2005

[Mitotic activity in serous adenocarcinoma of the uterine body].

A comparative study of uterine serous (36) and endometrial (32) adenocarcinoma was undertaken. The former pathology revealed a higher mitotic index (18.2%) than the latter (11.4%) (p < 0.01). Predominance of metaphases among the variety of mitotic phases as well as high metaphase-prophase index (73.6% and 69.2% in serous and endometrial adenocarcinoma, respectively) were typical of malignant tumors in general. The share of patholological mitoses in serous adenocarcinomas was 1.6 times (61.8%) that in endometrial adenocarcinomas. Moreover, serous adenocarcinomas showed a wide range of pathological mitoses which were often responsible for aneuploidy development. The above differences in uterine serous and endometrial adenocarcinoma were in full conformity with the well known aggressive nature of the former pathology and may be used as an additional criterion of differential diagnosis.

Aneuploidy↗
PubMed2004

Effect of testosterone derivatives administered to pregnant rats on the brain of their offspring (delayed consequences).

We examined the offspring of rats receiving sustanon with testosterone derivatives on day 19 of pregnancy. At the age of 1 month, these rats differed from control animals in the indexes of higher nervous activity. The relative weight of the brain increased in 54-day-old rats receiving the hormone. Female rats were characterized by increased sudanophilia of the white matter in cerebellar hemispheres and high RNA content in layer V neurons of the parietal lobe, increased volume of nuclei in hippocampal neurons, weight of the ovaries (tendency), size of the largest follicles, and high activity of 3beta-ol-steroid dehydrogenase. The weight of the adrenal glands and 3beta-ol-steroid dehydrogenase activity in adrenocortical cells of the fascicular zone increased in male rats.

Adrenal Glands↗
PubMed2004

Effect of the age of pregnant females on brain development in the offspring.

We examined offspring of 9-10 and 3.5-4 month-old female rats. Female offspring (14, 21, 28, 35, and 40 days) of old rats had higher body weight than offspring of young animals. No intergroup differences were revealed in the body weight of male offspring. At the age of 40 days the offspring of old females differed from the offspring of young rats by higher absolute weight of the brain (females), lower size of ganglionic neurons in the parietal lobe (males and females), and lower blood testosterone concentration (males). Thirty-day-old offspring of old rats exhibited higher locomotor activity and lower degree of anxiety compared to the offspring of young animals.

Animals↗
PubMed2004

[Expression of Hsp70 and Hdj1 chaperone proteins in human tumor cells].

Heat shock proteins (Hsp), or "stress proteins", play an important role in maintenance of cellular homeostasis both under normal conditions and during cellular stress. We tested malignant female urogenital and breast tumors for Hsp70 and Hdj1 (Hsp40) chaperones. Immunoenzyme procedure (based on Hsp70 and ATP interaction) was used to assay Hsp70 levels. Hsp70 and Hdj1 expression was higher in malignant cells than in benign ones. We were the first to demonstrate the feasibility of using Hdj1 expression as a novel prognostic factor for neoplastic disease.

Biomarkers, Tumor↗
PubMed2003

Morphology of the cerebellum in the progeny of female rats exposed to long-term emotional stress before pregnancy.

The structure of the cerebellum was studied in 40-day-old progeny of female rats exposed to 3-week emotional stress and mated with intact males after 10 days and in controls (progeny of intact females). The cerebellum in the experimental group was smaller, the nucleus and cytoplasm of Purkinje cells were smaller, the concentration of RNA in their cytoplasm and increased, the percentage of dark Purkinje cells increased, and the concentration of lipids in the molecular cortical layer and white matter decreased.

Age Factors↗
PubMed2002

Effect of emotional stress experienced by female rats before pregnancy on brain development in their offspring.

Twenty-one- and 40-day-old offspring from female rats exposed to emotional stress for 3 weeks and mated with intact males 10 days later were examined. Intact female offspring served as the control. The weight of the brain of 21- and 40-day-old experimental rats varied is a wider range compared to the control. In 40-day-old experimental males, the mean weights of the brain and hemisphere were lower than in controls. In 21-day-old rats, layer V neuronal nuclei were enlarged, while the thickness of the parietal cortex tended to decrease. In 40-day-old animals, morphometric parameters of neurons in the neocortex and hippocampus and RNA concentration in their cytoplasm did not differ from the control. Thirty-day-old experimental rats demonstrated low exploratory activity in the plus-maze test.

Animals↗
PubMed1999

[The cytological indices and electrokinetic mobility of the cell nuclei of the buccal epithelium in assessing periodontal status].

Study of electrokinetic mobility of buccal epitheliocyte nuclei, nonspecific resistance of buccal mucosa cells, and cytograms of patients with periodontitis of different severity revealed a clear-cut correlation between these parameters and severity of clinical picture of periodontal inflammation. Morphological and cytological studies of buccal epithelial cells are proposed to be used for assessing the severity of periodontal inflammation and the efficacy of therapy.

Cell Nucleus↗
PubMed1997

The redox state of coenzyme Q10 in mitochondrial respiratory chain and oxygen-derived free radical generation in cardiac cells.

The aim of this study was to relate changes in the redox state of mitocondrial electron carriers to the 'burst' of oxyradicals in postischemic myocardium. The free radical EPR signals of control and re-oxygenated rat hearts were mainly due to coenzyme Q10, the line width was 0.81 +/- 0.02 mT, and the intensities (1.58 +/- 0.12) x 10(16) and (1.41 +/- 0.13) x 10(16) spins/g. The low-temperature spectra of oxygenated myocardium contained a predominant signal from a S3 Fe-S center and weak signals from N1b, N2, N3, N4 and S1 centers. Global ischemia caused cardinal changes in the redox state of the mitochondrial respiratory chain. The low-temperature EPR spectrum now contained intensive signals from most Fe-S centers. The amount of coenzyme Q10 semiquinones decreased during global ischemia, but the content of flavosemiquinones increased. The line width of the signal of the ischemic heart was 1.28 +/- 0.03 mT, and its intensity corresponded (3.16 +/- 0.94) x 10(16) spins/g. The spin-trapping experiments with TEMPONE-H showed that the rate of oxyradical generation in isolated cardiomyocytes essentially increased after hypoxia or on adding rotenone and antimycin A. It became equal to 4.2 +/- 0.3, 8.2 +/- 0.6 and 7.1 +/- 0.5 nmol/min mg-1 mitochondrial protein, respectively. The maximal stimulatory effect was observed in the presence of both inhibitors. The addition of superoxide dismutase, but not catalase, suppressed the formation of oxyradicals.

Animals↗
PubMed1997

[Synthesis of triterpene 2-deoxy-alpha-D-hexopyranosides on the basis of glycals and their effect on reparative processes].

Triterpene 2-deoxy-alpha-D-hexopyranosides were synthesized by the glycosylation of oleanane triterpene alcohols with D-glucal and D-galactal acetates in the presence of di(sym-collidine)iodonium perchlorate with subsequent deiodination and deacetylation of the resulting 2-deoxy-2-iodo-alpha-D-glycosides. 2-Deoxy-alpha-D-arabino- and -lyxo-hexopyranosides of methyl glycyrrhetinate demonstrated pronounced antiulcer activity and stimulated reparative skin regeneration in rats more effectively than glycyrrhizic acid and methyluracil.

Animals↗
PubMed1994

[Transformations of glycyrrhizic acid. VIII. Synthesis of immunomodulating glycopeptides using tert-butyl amino acid esters].

Triterpene glycopeptides, derivatives of glycyrrhizic acid, were synthesized with the use of tert-butyl esters of L-amino acids. The condensation of glycoside with esters was carried out with N-hydroxysuccinimide--N,N-dicyclohexylcarbodiimide or N-hydroxybenzotriazol--N,N'-dicyclohexylcarbodiimide in the presence of a base (triethylamine, N-methyl- or N-ethylmorpholine). The protection groups were removed with the use of trifluoroacetic acid.

Adjuvants, Immunologic↗
PubMed1994

[Generation of superoxide radicals by the mitochondrial respiratory chain of isolated cardiomyocytes].

Generation of superoxide radicals by the mitochondrial respiratory chain of cardiomyocites isolated from rat heart and treated with saponin was studied. The rate of O2- production was measured by electron paramagnetic resonance (EPR) spectroscopy using hydroxylamine TEMPONE-H as spin trap. A device has been constructed which provided permanent stirring of cardiomyocyte samples directly in the cavity and prevented cell aggregation. When substrates and antimycin A and/or rotenone are added, the radical production rate increased and reached its maximum in the presence of the both inhibitors. Superoxide dismutase as well as KCN suppressed the radical production, thus being suggestive of the generation of superoxide radicals in the bc1 complex, while the mechanism of O2- production is the same as was suggested for isolated mitochondria. The ratio between rates of O2- generation by isolated cardiomyocytes under various experimental conditions is in a good accord with corresponding parameter of isolated mitochondria. However, in the case of cardiomyocytes the absolute values of the O2- production rate are approximately twice as high as those in isolated mitochondria, presumably due to the partial damage of the mitochondrial respiratory chain during the isolation procedure.

Animals↗
PubMed1993

[The possible role of the inner mitochondrial membrane in regulating oxidative phosphorylation in cells in vivo].

It has been shown for the first time that the outer mitochondrial membrane has a low permeability for ADP and can control its diffusion into cells in vivo. Respiration of saponin-skinned cardiac and skeletal muscle fibers is maximally stimulated by millimolar concentrations of external ADP. The apparent Km values for ADP are equal to 297 +/- 35 and 334 +/- 54 microM, respectively. After complete extraction of myosin with 0.8 M KCl, which fully preserves the intact structure of the mitochondria, the apparent Km values for exogenously added ADP does not change. However, disruption of the outer mitochondrial membrane by osmotic shock (treatment with 40 mOsM KCl) causes a reduction of the apparent Km value down to 32.3 +/- 5.0 microM of ADP. The apparent Km for ADP in isolated heart mitochondria is 17.6 +/- 1.0 microM. It is concluded that there exists an intracellular factor in the cells in vivo which controls the outer mitochondrial membrane and notably decreases its permeability for ADP. After isolation of mitochondria this factor is lost. When mitochondrial creatine kinase is activated, weak intracellular fluxes of ADP passing through the outer mitochondrial membrane in the skinned fibers are amplified manifold due to the tight functional coupling between mitochondrial creatine kinase and the oxidative phosphorylation system. This coupling is considered to be the central mechanism in the control of cell respiration.

Adenosine Diphosphate↗
PubMed1990

[Regression of the changes developed in the adrenal cortex in hypercholesterolemia].

Administration of cholesterin to rabbits for 2 months results in its increased concentration in blood and in adrenal cortex. Adrenocorticocytes demonstrate a decreased nuclear-cytoplasmic ratio, decreased concentration of protein and RNA in cytoplasm, lowered succinate dehydrogenase and 3 beta-ol-++steroid dehydrogenase activity. In 2 months after abolishing cholesterin, a considerable part of the changes mentioned remains. If during this period dexamethasone, inhibiting the gland activity, is administered, the regression of the changes decelerates. Administration of the adrenal cortex activator--corticotropin--facilitates normalization of most of the parameters, altered in the gland under the effect of cholesterin administration.

Adrenal Cortex↗
PubMed1988

[Ultrastructure of the steroidogenic cells in the ovary of the Russian sturgeon before and after maturation under exposure to luliberin].

Cells with the ultrastructure typical of steroid cells of vertebrates were found in the theca and stroma of the Russian sturgeon ovary. Mitochondria with the tubulo-vesicular internal structure, smooth and rough endoplasmic reticulum, lipid droplets or liposomes were observed in the cytoplasm of these cells. After the ovulation of fishes, the volumetric density and mean diameter of cell mitochondria and of the reticulum are found to increase; besides, mitochondria are seen vacuolized. The ultrastructural changes may indicate that the production of steroid sex hormones is more intensive in fish during ovulation. These suggestions are in accordance with biochemical data available in the literature.

Animals↗