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Biomedical subjects

N V Perova

Publications and source records attributed to N V Perova.

At least 19 recordsLinked to original sources
PubMed1992

Primary prevention of cardiovascular disease: 3-year intervention results in boys of 12 years of age.

BACKGROUND: The intervention group comprised 477 children at the age of 11.8 +/- 0.11 years. The reference group comprised 528 children aged 11.9 +/- 0.12 years. Both groups were drawn on the basis of the selected examination of children from two Moscow districts. The criteria for risk factors involved the upper 5% of the distribution curve for blood pressure, the upper 10% of the distribution curve for cholesterol and triglycerides, the upper 15% of the distribution curve for the Quetelet index, and a positive response to the question on smoking, "Smoke at least once per week or more frequently?" METHODS: The intervention was carried out both among the entire sample population and more intensively among persons with risk factors. It included counseling for children and their parents on rational diet, physical activity, and smoking hazards. Relevant material on health education was disseminated. Follow-up examinations were carried out at 1 and 3 years following baseline measures. RESULTS: The examination at 1 year showed that the children of the intervention district had attained a greater reduction in their levels of total cholesterol, triglycerides, and systolic blood pressure than those of the reference district. High-density lipoprotein cholesterol levels decreased equally in both districts. After 3 years, the effect was retained for cholesterol and systolic blood pressure; the level of high-density lipoprotein cholesterol showed a greater reduction in district 2. After 1 year, the increase in the Quetelet index among the intervention sample (district 1) became less. After 3 years of intervention, the smoking accretion rate had decreased by 8.9% in district 1 (intervention) compared with that in district 2 (reference).

Blood Pressure↗
PubMed1992

[The immunochemical detection of apoprotein dissociation from particles of very low-density lipoproteins in human blood plasma].

The dissociation of very-low-density lipoprotein (VLDL) apoproteins was studied using immunochemical approaches. The analysis of monospecific antibody binding to apo E, C-II and C-III on VLDL surface showed low apoprotein accessibility for the antibodies while the accessibility of apo C-II and C-III in solution was complete. Lipoprotein preparation dilution resulted in increasing of apo E and C-II accessibility. It was suggested that apoprotein dissociation led to apoprotein cluster dissolving on VLDL surface and higher antigen determinant accessibility. The findings confirmed previous theoretical analysis of apoprotein dissociation.

Animals↗
PubMed1992

[Changes in plasma lipid and apoprotein levels in patients with ischemic heart disease after hemosorption].

All the patients who had undergone a course of non-specific hemosorption (HS) for clinical indications showed lower plasma lipid levels and largely lower triglyceride concentrations. The patients with hypercholesterolemia alone simultaneously displayed decreased levels of cholesterol, high density lipoproteins, and apoprotein A-I. Apoprotein B levels reduced in patients having normal lipid values and in those with isolated hypercholesterolemia. The changes in the levels of lipids and apoproteins were different for 2 weeks after hemosorption in relation to the baseline lipid spectrum. The patients with coronary heart disease with hyperlipidemias had positive trends in lipid spectral changes: the parameters of atherogenic classes of lipids tended to decrease, whereas those of antiatherogenic lipid classes tended to show a slight increase. There was a negative direction in the dynamics of the studied parameters in renal patients, in those who had normal baseline lipid values, and in those with isolated hypo-alpha-cholesterolemia, i. e. higher plasma cholesterol and triglyceride, low density lipoprotein cholesterol and apoprotein B levels.

Adult↗
PubMed1991

A comparative analysis of the spectrum of blood lipoproteins in random population samples. A Soviet-Polish cooperative lipid project.

Mean values of cholesterol contents in low- and high-density lipoproteins, and the 10% and 90% cut-off points of their distribution were determined in random samples of men aged 35-64 years and resident in three Soviet cities (Kiev, Moscow, Novosibirsk) and two Polish regions (Warsaw, and Tarnobrzeg province). Comparative analysis revealed that, while having identical mean total cholesterol levels, the studied populations differ both in the character of cholesterol distribution in atherogenic and nonatherogenic lipoproteins and in their age dynamics. The lipoprotein spectrum was also compared with data of overall mortality and that from ischaemic heart disease and stroke in the respective areas. The comparison suggested a potential association between the incidence of these diseases and the incidence of individual lipid risk factors in the population. The regional specifics of the blood lipoprotein spectrum must also be considered when developing programmes of atherosclerosis prevention.

Adult↗
PubMed1991

[Relations between the levels of lipoprotein-containing immune complexes and lipids in the blood of patients with ischemic heart disease].

The sera from most patients with coronary heart disease concurrent with angiographically documented coronary atherosclerosis were found to contain apolipoprotein B (Apo B), neither apolipoprotein E (Apo E) nor apolipoprotein AI (Apo AI) in the circulating immune complexes precipitated by polyethylene glycol-6000 (PEG). Low density lipoproteins are the major components of cholesterol-containing immune complexes precipitated by PEG. A correlation was established between the serum levels of total cholesterol (r = 0,74; p less than 0.01), and low density lipoprotein (LDL) cholesterol (r = 0.77; p less than 0.01) in patients with coronary heart disease and cholesterol in LDL-containing No relationship was found in healthy individuals. The in vitro increase in LDL levels in most patients with coronary heart disease concurrent with coronary atherosclerosis was not followed by an elevation in LDL-containing immune complexes.

Antigen-Antibody Complex↗
PubMed1991

[Circulating immune complex cholesterol as a biochemical marker of coronary atherosclerosis].

The study was undertaken to examine 134 patients who were divided into 2 groups: 1) those with angiographically documented coronary atherosclerosis and 2) those with unaltered coronary arteries. The levels of immune complex cholesterol and the parameters of serum lipid spectrum were investigated in all the patients. The level of immune complex cholesterol and the apo B/apo AI ratio were the most informative indices in the characterization of coronary atherosclerosis. Immune complex cholesterol may be used as a marker of coronary atherosclerosis, the diagnostic accuracy is 78% with this method.

Adult↗
PubMed1991

[Increased risk of death from coronary heart disease in men with low blood concentration of total cholesterol and low density lipoprotein cholesterol according to data from a prospective epidemiologic study in Moscow and Leningrad within the framework of Soviet-American cooperation].

The authors provide the results of a prospective study carried out for almost 10 years among men who underwent screenings in 1975-1977 at an age of 40-59 years in Moscow and Leningrad (overall 6431 persons) with a purpose of analyzing potential causes of high risk of death from coronary heart disease in a group of subjects with hypocholesterolemia. Based on a mathematical-statistical analysis, variants of the interpretations of the indicated fact are presented.

Adult↗
PubMed1990

Low density lipoprotein-containing circulating immune complexes and coronary atherosclerosis.

Blood serum of most patients with coronary heart disease (CHD) caused a 2- to 5-fold increase in the lipid content of smooth muscle cells cultured from unaffected human aortic intima, i.e., possessed an atherogenic potential manifested in culture. Treatment of the CHD patients' serum with 2.5% polyethylene glycol 6000 removed the circulating immune complexes. The serum subjected to this treatment lost its atherogenic properties, i.e., failed to increase the content of lipids in cultured cells. Incubation of smooth muscle cells derived from human aortic intima with circulating immune complexes isolated from an atherogenic patient's serum caused a 1.5- to 3-fold rise in the intracellular cholesterol. Circulating immune complexes contained apolipoprotein B (apo B), but not apolipoproteins A1 and E. The apo B content strongly correlated with the total cholesterol content. The cholesterol/apo B ratio of the complexes was characteristic of low density lipoproteins (LDL), but not of very low density lipoproteins or intermediate density lipoproteins. The composition of the main lipid classes in these complexes was similar to that in LDL. Blood sera of most (90%) CHD patients was characterized by a high cholesterol and apolipoprotein B content in circulating immune complexes. The ability of these sera to induce lipid accumulation in cultured cells directly correlated with the cholesterol and apolipoprotein B level of circulating immune complexes (r = 0.91). These findings suggest that the atherogenic potential of CHD patients' blood serum is due to LDL-containing immune complexes.

Adult↗
PubMed1990

[Newly developed stenocardia: effect of diet with increased amount of polyunsaturated fatty acids of the omega-3 group on blood lipids and apolipoproteins].

The effects of omega-3 polyunsaturated fatty acids (PUSF), a 4-week fish diet--350 g of scomber a day, on the blood lipid-apolipoprotein spectrum were evaluated in 22 patients with primary angina pectoris as compared to 8 control subjects received hospital protein-, fat-, carbohydrate-, and calorie-balanced diet No. 10 differing in omega-3 PUSF content (5 and 0.03 g/day, respectively). The fish diet caused a significant reduction in total cholesterol (TC) and low density lipoprotein cholesterol (LDLC) in patients with hypercholesterolemia, however, the normal cholesterol (under 200 mg/dl) and LDLC (under 130 mg/dl) levels were reached only in a small proportion of the patients. There was a hypotriglyceridemic effect of omega-3 PUSF that was more pronounced at initially high triglyceride concentrations. Heterogeneous changes were found in LDLC levels with the fish diet. i.e. from a great decrease at initially high LDLC levels to a small increase at initially low LDLC in patients with hypertriglyceridemia and low levels of high density lipoproteins. It was concluded that a fish diet should be included into a complex of measures aimed at the secondary prevention of coronary heart disease in patients with primary angina concurrent with hypercholesterolemia (even moderate) and hypertriglyceridemia unassociated with hypoalphacholesterolemia.

Adult↗
PubMed1990

[Possible relationship between polyunsaturated fatty acids and signs of left ventricle hypertrophy].

In aborigines from the costal and continental areas of Chukotka who differ in dietary polyunsaturated fatty acid (PFA) n-3 intake, specific features of the composition of fatty acids in cell membranes were revealed in a model of erythrocytes: the costal inhabitants showed a higher proportion of PFA n-3 mainly through eicosapentaenic acid and lower proportion of major PFA n-6. With this, plasma lipoprotein lipids in whose composition the acids transported to the cell membranes displayed the similar regularities in changes in fatty acid composition. Only a far larger portion of eicosapentaenic acid in the cell membranes from the costal inhabitants than from the continental inhabitants was associated with greater mass of the left ventricular myocardium. It was concluded that transport of lipids containing high PFA n-3 in the composition of lipoproteins to the cell membranes caused an increase of the acids in them and, evidently, a change in physicochemical and, therefore, functional properties of cells.

Adult↗
PubMed1990

[Dynamic behavior of apoproteins of human plasma very low density lipoproteins and lipolysis regulation].

Using the dynamic fluorescence quenching method, it was shown that very low density (VLDL) apoproteins (apo B, E and C) tryptophanyls exhibit a lower accessibility towards water-soluble quenchers as compared to apo B LDL chromophores. The efficiency of proteolytic degradation by trypsin of VLDL-associated apo E and apo C was much lower than that of apo B. These results may be due to the cluster arrangement of amphipatic apo E and apo C on the VLDL surface and/or to their partial shielding by apo B. Treatment of VLDL particles with sub-lytic concentrations of the detergent, Tween-20, did not change the relaxation characteristics of amphipatic apoprotein tryptophanyl microenvironment, but resulted in a reversible structural transition registered by a "red" shift of the emission spectrum maximum as well as by change of the iodine quenching pattern. The detergent-induced increase of the VLDL tryptophanyl accessibility to acrylamide and the decrease of the quenching constant at the partial and complete particle solubilization were related to a change of the apo B molecular package. Treatment of VLDL with Tween-20 or cow milk lipoprotein lipase resulted in the appearance of tryptophanyl population that was not involved in the resonance energy transfer to the lipid phase-localized fluorescent probe pyrene, which is indicative of the protein dissociation. Treatment of VLDL particles with sub-lytic concentrations of Tween-20 revealed a lower (compared to apo C) relative affinity of apo E for the VLDL lipid surface. Inhibition of the lipoprotein lipase activity by apoprotein C-III was found to be non-competitive. It was concluded that lipolysis is a self-regulatory process which involves changes in the effector apoprotein concentration on the surface of triglyceride-rich particles.

Apolipoproteins↗
PubMed1990

[The effect of a diet enriched with omega-3 polyunsaturated fatty acids on thrombocyte functional activity and on the blood lipid-apolipoprotein spectrum in newly occurring stenocardia].

The diet enriched with omega-3 polyunsaturated fatty acids (5 g/day for 4 weeks) was applied to the treatment of patients (n-22) with angina pectoris occurring for the first time. Meanwhile 6 patients received the control diet similar to the fish one as regards the protein, fat, carbohydrate, cholesterol and caloric ratio. The control group patients showed no alterations in blood lipids and apoproteins of in platelet function. The patients who received the fish diet manifested an appreciable decrease in the concentration of triglycerides (p less than 0.01), a slight reduction of cholesterol content. The level of high density cholesterol remained unchanged. There was a decrease in the concentration of thromboxane (p less than 0.05) and in the platelet count (p less than 0.05). In some patients, individual reactions of ADP-induced platelet aggregation were revealed: from the lowering (-60-10%) seen in the third of the examined up to the rise (+10+90%) in the other third. The decrease of apoprotein A1 established as safe for the protective cholesterol-transport properties of high-density lipoproteins was established.

Adult↗
PubMed1990

[Study of in vitro thromboxane A2 generation by platelets of patients with first-time appearing angina pectoris under the effect of fish diet].

Thromboxane A2 (TxA2) is a pathogenic factor as it stimulates thrombogenesis and causes vasospastic reactions typical of coronary heart disease. The eicosapentaenic acid (EPA)-rich diet containing precursors of inactive TxA2 synthesis and the routine hospital diet (No. 10 according to Pevzner) were examined for effects on platelet generation of TxA2 on induction of ADP aggregation in 12 patients with first angina (FA). In patients with FA keeping diet No. 10, the platelets were found to be able to generate TxA2 under the influence of ADP, while in those on EPA-rich diet, the latter failed to exhibit this capacity. It was suggested that the EPA-containing fish diet might affect platelet aggregation favourably, which followed from the evidence for decreased pathogenic TxA2 generation in the aggregated platelets from FA patients and a lower risk of vascular spasms.

Adult↗