Circulating Complex of Lipoprotein(a) and Proprotein Convertase Subtilisin/Kexin Type 9 in the Serum Measured by ELISA.

The presence of a complex of lipoprotein(a) and proprotein convertase subtilisin/kexin type 9 (PCSK9) in the blood of healthy volunteers and patients with cardiovascular diseases was analyzed by ELISA. The levels of the complex varied in a wide range and did not depend on the concentrations of Lp(a) and PCSK9. Moreover, the complex was found not only in patients with cardiovascular diseases, but also in healthy volunteers, which can indicate physiological role of lipoprotein(a) as PCSK9 transporter.

Characteristics of Lipoprotein(a)-Containing Circulating Immune Complexes as Markers of Coronary Heart Disease.

We studied the composition of circulating immune complexes precipitated in the presence of various concentrations of polyethylene glycol in patients with coronary heart disease (CHD) and high concentration of lipoprotein(a) - Lp(a). Precipitation of highly purified Lp(a) preparation with polyethylene glycol was evaluated. The contents of Lp(a), autoantibodies to Lp(a), IgG, and IgM in circulating immune complexes isolated from the sera of donors and CHD patients with normal and high levels of Lp(a) were measured.

[The effect of increased concentration of lipoprotein (a) on identification of sub-faction of lipoproteins using native electrophoresis technique].

The quantitative analysis of sub-fractions of lipoproteins acquires growing significance in diagnostic and prognosis of cardiovascular diseases. It is well known that presence of lipoprotein (a) in high concentrations significantly distorts results of biochemical analysis, in particular detection of level of cholesterol of low-density lipoproteins. The lipoprotein (a) is a heterogeneous particle and its mobility in the systems used for analysis of sub-fractions of lipoproteins can have significant variability that will bring inaccuracy into results.

[DNA aptamer based sorbents for binding human IgE].

DNA aptamer based sorbents are synthesized for binding human IgE. Sorbents effectively removed IgE from human blood plasma. The experimental values of IgE desorption constants were from 11 x 10(-l0) to 1.

[Autoantibodies against lipoprotein(a) in patients with coronary heart disease].

Objective: Lipoprotein(a) - Lp(a) is an independent risk factor of atherosclerosis and its complications. In spite of the long period of Lp(a) research there is no complete understanding of its physiological role and atherogenic action. The goal of this study was to investigate the presence in human plasma of circulating autoantibodies to Lp(a) belonging to different classes of immunoglobulins, and to elucidate their relationship to the presence and severity of coronary atherosclerosis in middle aged patients with coronary heart disease.

[Effect of cascade plasma filtration on spectrum of subfractions of low density lipoproteins in blood plasma of patients with ischemic heart disease].

We studied effect of cascade plasma filtration on subfractions of low density lipoproteins (LDL) in 16 patients with ischemic heart disease (IHD) and hyperlipidemias refractory to drug therapy. The procedure caused 37.6 ± 1.

[The immune-enzyme analysis based on chimeric molecule and oligopeptide fragmentations to detect autoantibodies to beta-adrenergic receptor in patients with dilation cardiomyopathy].

The article deals with specification of technique of immune-enzyme analysis to detect autoantibodies to beta-adrenergic receptors (beta1-AP) using compound of oligopeptids representing the fragmentations of extracellular sites beta1-AP and chimeric molecule of extracellular section of receptor This technique significantly exceeds the analogues defined in publications by its sensitivity and correlation with diagnosis.

[Soluble receptors for tumor necrosis factor and lipid metabolism as potential prognostic factors in patients with prostate cancer].

There was investigated the relationship of lipid metabolism, humoral immunity, high sensitivity C-reactive protein and soluble receptors for TNF-alpha with the presence, severity and prognosis of the disease in 85 patients with morphologically verified diagnosis of prostate cancer. Connection with the dynamics of change in PSA as a major predictor of the disease was observed for concentration sRI and sRII to TNF, PSA baseline, total cholesterol and LDL-cholesterol. During follow-up the relative risk of poor prognosis increased by 3 times, and death-in 8.

[Affine sorbent with typtophil-threonil-tirosine for binding immunoglobulin G: sorption characteristics and aspects of practical application].

New chromatographic material based on tryptophil-threonil-tirosine was prepared. This sorbent effectively binds human, sheep, goat and cow immunoglobulins G. New sorbent shows high selectivity for removing immunoglobulins from blood plasma.

[Pleiotropic effects of nicotinic acid therapy in men with coronary heart disease and elevated lipoprotein(a) levels].

Purpose: To assess effects of niacin on risk factors of atherosclerosis in men with coronary heart disease (CHD) and high lipoprotein(a) [Lp(a)] levels.

Material And Methods: Sixty men (mean age 54+/-6 years) with angiographic evidence of CHD were randomized into two groups. Active group (n=30) received extended release nicotinic acid 1500 mg, control group consisted of remaining 30 patients.

[High level of lipoprotein (a) as a predictor of poor long-term prognosis after coronary artery bypass surgery].

Study aim was to investigate the association of lipoprotein (a) [Lp(a)] level with the development of cardiovascular complications in long-term follow-up period after coronary artery bypass grafting (CABG). Patients with chronic ischemic heart disease (IHD) (n = 361, 88% men, mean age 55 +/- 9 years) who had had CABG were included in the study. Before surgery we assessed presence of classical risk factors, left ventricular ejection fraction, concentrations of lipids and Lp(a) in blood serum.

[Preparation of affinity sorbents with immobilized synthetic ligands for therapeutic apheresis].

Preparation and stability of a few examples of medical sorbents are described. A simple and practical technique has been developed for sorbent preparation with the low weight synthetic ligands such as amino acids, peptides or oligosaccharides. This approach to sorbent preparation enables the development of the new affine columns generation for medicine and biotechnology to be carried out with ease.

[Synthesis and properties of a new conformational antigen modeling an extracellular region of beta(1)-adrenoreceptor].

Two fragments corresponding to the 125-133 and 206-218 sequences of a molecule of the beta(1) adrenoreceptor (autoantibodies to this protein are often found in patients with dilated cardiomyopathy) were synthesized by the solid phase method with the use of Fmoc technology. Two new conformational antigens were prepared by directed (regioselective) and undirected (spontaneous) formation of intramolecular and intermolecular disulfide bridges between the corresponding cysteine residues of the synthesized peptides. One of these antigens consisted of a mixture of disulfide isomers, and another antigen was an isomer with a natural arrangement of S-S bridges.

[The role of atherosclerosis risk factors in development of ischemic heart disease in young men].

Aim: To determine distribution of different atherosclerosis risk factors and their correlation with severity of coronary arteries (CA) affection in young men.

Material And Methods: A total of 235 males aged 28-45 years were examined with coronarography which detected more than 50% narrowing in one or several major CA in 200 patients (the study group with coronary artery disease), 35 males without coronary stenosis served control. Atherosclerosis risk factors, serum lipids, lipoprotein(a), fibrinogen, C-reactive protein (CRP) were assessed.

Comparative analysis of efficiency and specificity of various sorbents for apheresis of low-density lipoproteins.

Efficiency of sorbents for LDL apheresis was compared in vitro. The sorbents based on ion-exchange interaction of the ligand with LDL (Liposorber, DALI) exhibited minimum specificity towards the eliminated component, while immunosorbents (LNP-Lipopak, LDR-TheraSorb) were most efficient. By sorption capacity, the available hemosorbents are inferior to plasmasorbents, which explains low efficiency of the therapy based on single application of hemosorbents especially in patients with consederably increased content of LDL cholesterol.

[Apolipoprotein B100 as a risk factor of acute coronary syndrome and this risk factor effect on arterial hypertension in patients with ischemic heart disease].

Aim: To clarify correlations between an elevated concentration of apolipoprotein B100 (apoB) in blood plasma and risk of acute coronary syndrome (ACS); to study apoB level in hypertensive patients and its correlation with ischemic heart disease (IHD) risk in these patients.

Material And Methods: Lipid serum spectrum (cholesterol, triglycerides (TG), lipoprotein a (Lpa) and apoB was studied in 456 patients with ACS by NYHA criteria, 119 patients with chronic IHD and 86 patients free of cardiovascular diseases (controls). All 575 patients with IHD were divided into those with and without hypertension (426 and 149 patients, respectively).

[Ethnic differences in apolipoprotein B levels in hyperlipidemia in Russian and Kirghiz populations].

Aim: To evaluate the levels of apolipoprotein B (apo-B) and coronary heart disease (CHD) risk factors in Russians and the Kirghiz with primary hyperlipidemia (PHL).

Material And Methods: Lipid spectrum of the blood (LDLP and HDLP cholesterol, total cholesterol, triglycerides), apo-B, CHD risk factors were studied in 60 Russian and 75 Kirghis patients with PHL aged 28 to 67 years (mean age 50.0 +/- 7.

[Lipoprotein(a) and Apo-A isoforms in patients with intermittent claudication].

Aim: To study a correlation between lipoprotein(a) [LP(a)], as well as the phenotype of apoprotein(a) [apo(a)] and the presence of intermittent claudication (IC).

Materials And Methods: The study included 25 patients (9 females, 16 males; mean age, 63.4 +/- 8.

[Lipoprotein (a) and ischemic heart disease in patients with hypertensive disease].

Relationship between level of lipoprotein (a) and presence of ischemic heart disease (IHD) was studied in 191 patients with hypertensive disease (essential hypertension) (112 men, 79 women, age 56.9-/+10.6 years) and 33 patients with normal blood pressure (23 men, 10 women, age 50.

[Apheresis of immunoglobulins - new approach to the treatment of severe dilated cardiomyopathy].

Two courses of immunoadsorption with 'Ig Adsopak' were used in the treatment of a patient with dilated cardiomyopathy (DCM) during which all class G and partially class M and A immunoglobulins were removed. Every course consisted of 5 daily procedures and resulted in removal of 98% of immunoglobulins. This was associated with complete removal of autoantibodies to beta1-adrenoreceptor.

[Effect of hormone replacement therapy on blood serum lipids in postmenopausal women with type 2 diabetes].

There are limited data concerning influence of hormone replacement therapy (HRT) on lipid profile in women with type 2 diabetes. Aim of the study was to compare changes of blood lipids during HRT in postmenopausal women with and without type 2 diabetes. Seventy seven women included in the study were assigned to 1 of 4 groups, basing on being diabetic or nondiabetic, and further subdivided into users of estrogen alone (ERT), and of estrogen plus progestin (EPRT).

Changes in the ratio between apolipoprotein (a) and lipids in human plasma during interaction with polyclonal sheep antibodies against lipoprotein (a).

Plasma contents of apolipoprotein (a), apolipoprotein B 100, cholesterol, triglycerides, and vitamin E were measured in 2 patients with lipoprotein (a) concentration >100 mg/dl during the interaction with the anti-lipoprotein (a) immunosorbent. Intraindividual heterogeneity of apolipoprotein (a)-containing particles in the plasma was demonstrated. Polyclonal antibodies against lipoprotein (a) immobilized on Sepharose CL-4B more effectively removed free apolipoprotein (a) than complexes containing apolipoproteins B 100, apolipoprotein (a), lipids, and vitamin E.

[Method of quantitative analysis of beta2-microglobulin in human blood].

A simple and economic method of radial immunodiffusion is developed for diagnostic measurements of beta 2-microglobulin in human serum. Human serum and plasma concentrations of beta 2-microglobulin can be measured sufficiently accurately; the results are reproducible. The reproducibility and addictiveness of the method were evaluated.

Immunosorbent for removal of b2-microglobulin from human blood plasma.

Immunosorbent removing beta2-microglobulin from human blood plasma was synthesized on the basis of sheep monospecific polyclonal antibodies to beta2-microglobulin and conditions ensuring effective regeneration of the immunosorbent for its repeated use were selected. Relationships between adsorption capacity and the volume of immobilized ligand, antigen concentration in the solution, and duration of incubation were studied. The adsorbent can be used for effective and specific removal of beta2-microglobulin from the plasma of patients on chronic hemodialysis.