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Biomedical subjects

L V Khripach

Publications and source records attributed to L V Khripach.

At least 19 recordsLinked to original sources
PubMed2006

[A complex approach to evaluation of human genome instability].

In this study, evaluation of genome instability in individuals exposed to chemical compounds included detection of the genetic polymorphism of some xenobiotic metabolic enzymes (CYP1A1, CYP1E1, PON1, GSTM1, GSTT1), as well as measurement of oxidative state chemiluminescent variables and the level of cytogenetic damage. According to the study, the level of chromosomal aberrations in peripheral blood lymphocytes shows a strong correlation with PON54 left allele and GSTM1 null genotype, and can be described by the polynomial function of blood plasma luminol-dependent chemiluminescence. The frequencies of micronuclei in buccal epithelium displayed a weak association with GSTT1 null genotype.

Genome, Human↗
PubMed2006

[The congenital morphogenetic variants and genetic polymorphism of the system of xenobiotic detoxication in children living in dioxin-contaminated regions of South Vietnam].

The presence of dioxins and dioxin-containing ecotoxicants (DCE) in human environment leads to multi-level homeostasis disbalance and, eventually, dioxin pathology (DP) develops. This was demonstrated for the adult population of South Vietnam (1), who had suffered from the use of military chlorphenoxiherbicides to which dioxins had been added. The subjects of this study were children who belonged to the second generation of the inhabitants of DCE-polluted South Vietnam areas. In this sample, the frequency of malformations depending on two factors, genes GSTMI, GSTT1, CYP1A1 genotypes, and DCE exposure, were estimated. The study demonstrates that an increased level of congenital morphogenetic variants per one child is associated with the presence of DCE in the environment, as well as the fact that this parameter is influenced by genotypes of xenobiotic detoxication genes.

Alleles↗
PubMed2006

[Population analysis and determination of the ethnic background are necessary in the study of multifactorial diseases: a study using the Dagestan population as a model].

Psoriasis, a multifactorial disease with genetic predisposition, has been used as an example to study the role of the ethnic background in multifactorial diseases in the Dagestan population. The individual information card (IIC) is proposed as the main tool for correct collection and processing of information. The results of the study demonstrate that the Dagestan population is a convenient and adequate model population for studying multifactorial diseases, such as psoriasis, and may serve as an object for studying the role of heredity in the etiologies and pathogeneses of this and other multifactorial diseases.

Dagestan↗
PubMed2004

[Active oxygen forms and genome damage by environmental factors].

The role played by active oxygen forms in damaging the human genome by environmental factors as well as the application of antioxidants to keep the oncology statistics among the hazardous-area residents low are under discussion. According to the independent results, there are essential differences between mechanisms of inflicting a genetic lesion to healthy subjects and to individuals of the risk categories due to that the latter have contacts with high concentrations of chemical compounds and with clinical patients with developed free-radical pathologies.

Environmental Exposure↗
PubMed1997

[Procedure for complex toxico-genetical investigations].

A biomonitoring system is proposed, which involves measurement of environmental genetoxicants, determination of mutagenic accumulation in biological substrates of human beings and the severity of genetic abnormalities in their somatic cells. The toxicogenetical monitoring system includes the assessment of the examinees mental status. The results of application of the system are given by using as an example two Yaroslavl (machine-building and oil-processing) plants.

Adult↗
PubMed1995

[Study of antimutagenic properties of the citrus drink Tampico].

Oral administration of the orange drink Tampico containing additionally vitamins A (12.7 mg/l), B (1.81 mg/l), C (86.9 mg/l) to FICBAxC57B1/6 mice has been shown to stabilize erythrocytic membranes and reduce chromosomal aberrations in the murine bone marrow cells induced by cyclophosphamide. There are experimental data on the effects of Tampico on the rate of reparative synthesis in peripheral lymphocytes and blood levels of malonic aldehyde in the mice exposed to model psychoemotional stress.

Animals↗
PubMed1993

[The antimutagenic action of a preparation of a species-nonspecific interferon].

The human gene-engineering gamma-interferon agent gammaferon (GF) is demonstrated to lower the level of chromosomal aberrations and release of cyclophosphamide-induced micronuclei in murine bone marrow cells. A model is suggested for regulating the ratio of single to multiple chromosomal aberrations induced by cyclophosphamide by altering the antioxidative status of the body. With this model, it was shown that the antimutagenic effects of GF were caused by two factors: the antioxidative effect of the corresponding placebo and the unknown (but none antioxidative) effect of gamma-interferon itself. Erythrocytic resistance to in vitro oxidative disturbance in the Fe2+/system was used as an integral measure of the body's antioxidative status.

Animals↗
PubMed1987

[Additional pathway of the metabolic activation of N-nitrosodiethylamine in the rat liver].

A cytosolic enzyme, aldehyde oxidase (AO), was shown to be involved in metabolic activation of carcinogenic diethylamine (DENA). DENA was reduced to corresponding hydrazines by AO in the presence of benzaldehyde. Products of DENA reduction by AO possessed mutagenic activity for Salmonella typhimurium TA 1950. Pretreatment of rats by antioxidant butylhydroxytoluene had no effect on this process of DNA bioactivation.

Aldehyde Oxidase↗
PubMed1976

[On hexokinase isozymes].

Electrophoretic study of hexokinase (HK) associated with the soluble fraction of mouse transplantable hepatoma 22a revealed that almost all bands of HK activities overlapped the bands of glucose-6-P dehydrogenase (G6PDH) activities in the gels. Similar results were obtained for liver, muscle and brain soluble fractions, as well as for various extracts from hepatoma 22a mitochondria and commercial preparation of yeast HK. A single type of HK, which does not overlap G6PDH activity, was located between types I and II (according to the Katzen classification) as a diffuse band of 1 hour manifestation. A possibility of structural organization of glycolytic enzymes in the cell essential for the quantitative estimation of the isozyme pattern is discussed.

Animals↗
PubMedDate not supplied

[Some environmental and hygienic aspects of preschool children's health in an industrial town].

The results of a medical genetic study of the spread of congenital morphogenetic types (CMGT) among 3-7-year-old children living in Magnitogorsk whose territory is highly polluted with chemical compounds are presented. In Magnitogorsk, the mean of CMGT cases per child is 2.89, which is much greater than the respective values for environmentally favorable cities and towns in Russia. The most common signs are as follows: diastema (137.79 cases per 1000 children), clinodactyly (135.98 per 1000), epicanthus (122.44 per 1000), and wide umbilical ring (110.71 per 1000).

Age Factors↗
PubMedDate not supplied

[Possible significance of hexokinase binding to mitochondrial membranes].

A magnitude of the Pasteur's effect and content of bound hexokinase were studied in various malignant and normal tissues. In all cases studied these two values were practically the same. Dynamics of changes in subcellular localization of hexokinase and the Pasteur's effect were similarly altered in liver tissue during ontogenesis. Binding hexokinase with mitochondrial membranes was assumed to be the cytophysiological mechanism for regulation of glycolytic activity by respiration.

Animals↗
PubMedDate not supplied

[Subcellular distribution of hexokinase in hepatoma and its electrophoretic properties].

In hepatomas of various malignancy contrary to normal and regenerating liver tissue a considerable part of hexokinase (HK) activity was bound with mitochondria. The HK activity, estimated in nuclei, microsomes and apparently in cytoplasma membranes, was due to contamination with mitochondrial fraction. High specific activity of HK in mitochondria of tumors might be responsible for the increased glycolysis, when these organelle preparations were added to the soluble fraction of cells. The HK of tumors was extracted from the preparations by alternative pathways. Reversible binding of some part of the enzyme with mitochondria was regulated by concentration of metabolites (ATP and G6P) similarly to the bound HK from normal tissues (brain, retina). At the same time the other part of unregulated HK activity (isozyme I only) was found in hepatomas to be intercalated into lipoprotein membranes; it was not controlled by metabolites.

Animals↗