[Study of the dynamics of endogenous IL-6 in the culture erythroblastic islands].

It is found that in the process of cultivating the erythroblastic islets (EI) of rat bone marrow, the concentration of interleukin-6 (IL-6) increases in the culture medium. Stimulating erythropoiesis was observed on the 48th hour in cultures, the stimulation was characterized by the growth of endogenous erythropoietin and activation of formation of EI de novo and de repeto. The continuing increase in the concentration of IL-6 in the cultures at the 72nd hour of the experiment was accompanied by a decrease formation of islands de novo and a decrease in the absolute number of EI in culture.

[Studying of the role of tumor necrosis factor-alpha in regulation of erythropoiesis in erythroblastic islands cultures].

An elevated level of tumor necrosis factor-alpha in a cultural system of bone marrow erythroblastic islands was found. It was associated with the suppressed formation of erythroblastic islands de repeto in 24-hr cultures. In 48-hr cultures, an increased level of erythropoietin and intensive formation of erythroblastic islands de repeto and de novo was found.

[Regulation of osteogenic differentiation of mesenchimal stem sells of bone marrow].

The review describes the mechanisms of hormonal, autocrine, paracrine and intracellular regulation in osteogenic differentiation of mesenchymal stem cells, the role of negative feedbacks in this process.

[Correlation of structurally-functional cardiac condition and levels of erythropoietin, tumour necrosis factor-alpha in blood in heart failure].

Structurally-functional myocardium parameters and their interconnection with erythropoietin and tumour necrosis factor-alpha levels in blood plasma of patients with heart failure were analysed. Prevalence of erythropoietin over tumour necrosis factor-alpha in blood had positive effect on myocardium-contraction ability under acute heart failure. Improvement of pumped cardiac function was not registered under prevalence of erythropoietin over tumour necrosis faetor-a in blood of patients with chronic heart failure.

[Dynamic changes of erythropoietin and tumor necrosis factor-alpha levels in peripheral blood and their correlation with erythropoiesis changes in posttransfusion polycythemia in animals].

Posttransfusion polyglobulia reveals elevated level of the tumor necrosis factor-alpha in peripheral blood, suppresses erythropoiesis in bone marrow erythroblastic islands by diminishing the newly forming erythroblastic islands, and suppresses erythropoietin production in rats.

[Erythropoietin levels in human tear fluid].

Erythropoietin level was evaluated in blood plasma and tear fluid of humans with normal functions of eye and normal blood characteristics. We examined 21 patients. Principle ability of erythropoietin level detection in patient's tear fluid ascertained.

[The investigation of dynamic changes of erythropoietin content of the erythroblast island cultures].

Dynamic changes of erythropoietin content on the 6th, 12th, 24 and 48th hours of cultivation in bone marrow erythropoietic island liquid short-term cultures were investigated. The initial doses of 0.25, 0.

[On the erythropoietin effect on the cell proliferative activity in the culture of th erythroblastic islands of the rat bone marrow in transfusion polycytemia].

The effect of experimental inhibition of the erythropoiesis on ability of the erythroide "crown" cells of erythroblast islands of the bone marrow to respond to the erythropoietin by the increase of the proliferative activity was studied. It was discovered that this ability depended on the degree of the erythropoiesis inhibition and on the class of the erythroblast island maturity. In the culture of the erythroblast islands of the bone marrow on the second 24-hour period after transfusion polycytemia reproduction, the proliferative activity of the erythroid cells in response to brining of the erythropoietin to the culture increased more in the erythroblast islands of the first and second maturity classes than in the reconstructing the erythroblast islands.

[Erythropoietin in patients with chronic heart failure].

The aim of this work was to elucidate the relationship between the serum erythropoietin level, the degree of heart involvement in patients with chronic cardiac failure (CCF), characteristics of peripheral red blood cells and iron metabolism. A total of 77 patients with ischemic CCF were enrolled in the study. The control group comprised 13 subjects free from cardiovascular disorders.

[Blood erythropoietin level in female reproductive age (can the reproductive tissue be the source of erythropoietin in blood?)].

Blood erythropoietin level was investigated in females of reproductive age, who had normal peripheral red blood findings. It was determined that blood erythropoietin level was 1.5-2 times higher (20.

[Sensitivity of cells to oxygen and erythropoietin production].

The review describes physiological responses of cells to oxygen concentration mediated mostly by action of hypoxia-inducible factor-1, as well as the role of this factor in erythropoietin production and induction of mammalian genes by hypoxia.

[the effect of colonystimulating macrophage factor on activity of the nuclear organisers in central macrophages of the cultures of the bone marrow erythroblastic islands].

Erythroblastic islands of the bone marrow are morpho-functional units of erythropoiesis. The functional state of erythroblastic islands' cells of the bone marrow was for the first time defined by estimation of activity of the nuclear organisers of the central macrophages in the erythroblastic islands cultivated for 24 hrs in presence of various doses of the colony-stimulating macrophage factor. The findings indicate that increased doses of the colonystimulating macrophage factor was accompanied by a respective enhancement of the activity of nucleolar organisers in central macrophages of erythroblastic islands.

[The effect of various stage maturity of erythrocytes upon proliferatio rate of erythroid cells in "crown" of erythroblastic islands].

Joint cultivation of small amounts of young and mature erythrocytes with bone marrow erythroblastic islands during 24 hours in liquid culture system results in erythropoiesis stimulation due to increase of number of cells in the state of mitosis in island's "crown". Prolonged joint cultivation and/or joint cultivation with plenty of premature and mature erythrocytes leads to inhibition of the erythropoiesis in the state of mitosis in the island's "crown". The maximum of the inhibitory effect was shown by erythrocytes from polycythemia rats.

[Activity of nucleolar organizers in central macrophage culture of bone marrow erythroblastic islands].

The erythroblastic islands of the bone marrow are morphofunctional units of erythropoiesis. In this work the functional state of erythroblastic islands' cells of the bone marrow, for the first time, was defined by the estimation of the activity of the nucleolar organizers of central macrophages in the erythroblastic islands, cultivated during 24 and 48 hours with the presence of various doses of erythropoietin. The findings indicated that the increase in doses of erythropoietin was accompanied by the corresponding increase of the activity of nucleolar organizers in central macrophages of erythroblastic islands.