PubMed Health⌕ Search

Biomedical subjects

V D Paponov

Publications and source records attributed to V D Paponov.

At least 19 recordsLinked to original sources
PubMed2002

Markers of general pathology.

Studies of the protein composition of leukocytes revealed markers of general pathology: 2 protein parameters (53K/H2A>0.25; 43K/H2A<1.61) differed from normal in 1627 patients with various pathologies. We compared protein parameters of leukocytes with other markers of general pathology. By the sensitivity and spectrum of associated diseases, the detected protein parameters of leukocytes can serve as the gold standard in the diagnostics of general pathology. These protein markers can be used for screening of newborns requiring therapeutic and preventive treatment, employers exposed to occupational hazards, and people inhabiting ecologically unfavorable regions, and for prevention of therapeutic complications in patients.

Biomarkers↗
PubMed2001

Informative value of monitoring of immune status and genome expression in blood leukocytes in psoriatic patients.

Comparative analysis of association with psoriasis before and after treatment of 53K/H2A and 43K/H2A leukocyte protein markers and parameters of leukocyte population (18 indexes) including concentration of peripheral blood lymphocyte subpopulations as markers of the immune status revealed advantages of the former method of patient monitoring for the evaluation of treatment efficacy. The method showed 100% sensitivity and correlation with the dynamics of clinical symptoms. A significant correlation of 53K/H2A parameter with blood content of CD3+, CD4+, CD8+, and CD72+ lymphocytes was established.

Adolescent↗
PubMed2001

Abnormalities of human genetic apparatus manifested in leukocyte proteins in psoriasis.

The content of 53K/H2A and 43K/H2A proteins in leukocytes of patients with psoriasis, newborns, and healthy donors was studied. In all patients one or both parameters differed from normal. Mean values and distribution of 53K/H2A in healthy siblings of psoriatic proband significantly differed from those in newborns and donors. It was concluded that 53K/H2A is a marker of pathological changes in the genome responsible for predisposition to psoriasis. This marker can be revealed in peripheral blood leukocytes before skin manifestations of the disease.

Adolescent↗
PubMed1987

[Structural heterogeneity of chromatin preparations at the level of DNA topology].

The structural heterogeneity of calf thymus chromatin preparations was studied at the level of DNA topology by analysing the influence of ethidium bromide on the chromatin viscosity in deproteinizing medium. In 0.7 M NaCl the chromatin was separated into the fractions with linear DNA (3--36% in various preparations) and with supercoiled circular DNA (scc DNA), which differ from each other in their adhesive properties. Reduction of disulfide bonds in residual chromatin protein with 5% mercaptoethanol linearized scc DNA, present in chromatin preparations as nuclear matrix subunits containing some loops of scc DNA on the protein globule.

Animals↗
PubMed1986

[Dynamic and static chromatin].

It was found that the dependence of the viscosity of calf thymus chromatin dispersions and human leukocytes on ethidium bromide concentration had two peaks indicative of domains with circular supercoiled DNA and varying resistance to ultrasound in the cells and isolated chromatin. The hypothesis of V. D. Paponov and P. S. Gromov (Bull. Exp. Biol. Med., N5, 590, 1985) on the transformation of static relations of nucleosome DNA-containing nuclei into dynamic, after chromatin exposure to ultrasound due to DNA linearization in chromatin domains possessing circular supercoiled DNA, has been confirmed.

Animals↗
PubMed1985

[Electrophoretic detection of protein p53 in human leukocytes].

Protein (m.v. 53 kilodalton) with electrophoretic mobility identical to that of protein detected in leukocytes of patients with Down's syndrome and of protein p53 obtained from mouse ascites carcinoma was demonstrated by polyacrylamide gel electrophoresis in healthy donors' leukocytes cultured with PHA and in peripheral blood of patients with chronic myeloleukemia. Appearance of the class p53 proteins in leukocytes of patients may be connected with the presence in their blood of the population of immature or transformed, proliferating or merely DNA-synthesizing leukocytes, particularly those amplifying the gene that codes protein p53.

Animals↗
PubMed1985

[Effect of heparin on DNA].

It was found that heparin is capable of increasing the sedimentation coefficient of DNA over alkaline and neutral sucrose density gradients as well as of reducing the intrinsic viscosity of native DNA. Irreversible compactization of DNA induced by heparin apparently by means of intramolecular aggregation of DNA with involvement of residual protein underlies the above-described phenomena. The influence of heparin on DNA is potentiated in more concentrated solutions. This should be taken into account in the assay of DNA-containing systems in the presence of heparin.

Centrifugation, Density Gradient↗
PubMed1985

[Effect of the supranucleosomal chromatin organization on histone-DNA interrelations].

It has been demonstrated by the method of competitive displacement of own chromatin histone by excess total histone that chromatin dispersity influence the strength of histone-DNA interactions in a medium of physiological ionic strength. Histone NI was removed from chromatin after the quantity of total histone added to chromatin was equivalent to that existing in chromatin. The proportion of histones H2A and H2B removed from chromatin was increased after mechanical of ultrasonic degradation of chromatin at 5-20-fold excess of total extra-histone. In some histone preparations, the removal of histones H2A and H2B was not detectable at even 200-fold excess of total histone. This may be explained by strengthening histone-DNA interactions in superhelical loops of chromatin.

Animals↗
PubMed1983

[Chromatin reorganization in a medium of physiological ionic strength in the presence of additional total histone].

The authors studied the capability of chromatin for structural reorganization in a medium of ionic strength, close to physiological one, under the effect of polyions of polycationic nature--summary histone of chromatin. Electrophoretic analysis demonstrated that like polyanions, summary histone forces out histone HI and partially histones H2B and H2A from chromatin. However, in contrast to polyanions, summary histone makes chromatin resistant to DNase-II, apparently potentiating the aggregation capability of chromatin despite the removal of histone HI.

Animals↗
PubMed1981

[Histone competition for DNA and its possible role in the self-assembly of eu- and heterochromatin].

Electrophoretic analysis of histones bound to DNA and remaining free in the mixtures of DNA with the total histone of chromatin in a medium of physiological ionic strength has shown that even the minimal weight excess of the total histone with reference to DNA (1.1:1) leads to the formation of nucleohistone impoverished in HI fraction because of histone competition for DNA. Within the histone/DNA ratio equal to 1.4, H3, H4, H2A and H2B are bound to DNA without competition, i.e. at a ratio in which they are added to DNA. Provided the histone/DNA ratio is higher in the mixture, there form nucleohistones enriched with H3 and H4 fractions. The role of histone competition for DNA in eu- and heterochromatin assembly is discussed.

Animals↗
PubMed1980

On mechanisms determining the interrelationships between DNA and histone components of chromatin.

The relative affinity of histones for DNA was studied by the analysis of competitive histone binding to DNA in whole histone/DNA mixtures at physiological and low ionic strengths as well as in water. Use of polyphosphate in similar experiments, as a model of DNA deprived of hydrophobic functional groups allowed us to reject the hypothesis that hydrophobic DNA-histone interaction plays a decisive role in the determination of the relative affinity of histones for DNA, because the orders of histone preference for DNA and for polyphosphate were the same. The relative histone affinity for DNA does not depend on the secondary structure of DNA or on the ionic strength of salt solutions, though the differences in the histone affinities for DNA decrease on lowering the salt concentration. The binding orders of the first and the last molecules of histone type to DNA, studied at various DNA/histone ratios in the medium of physiological ionic strength, are the following: H3+H4, H2A+H2B, H1 and H3+H4, H2A, H2B, H1. In water the binding orders of the first and the last histone molecules to DNA are identical: H3+H4, H2A, H2B+H1. It is concluded that the relative histone affinity for DNA in water/salt solutions is determined by non-ionic interactions between histones bound to DNA. The folding of DNA induced by histone-histone interaction seems to lead to the increase in the correlation between amino acid residues in the histone regions bound to DNA and the ionic DNA-histone interaction becoming stronger.

Animals↗