[Effect of NF-kappaB activation inhibitor curcumin on the oogenesis and follicular cell death in immune ovarian failure in mice].

In experiments on CBA mice, we studied the influence of an inhibitor of nuclear transcription factor kappaB activation curcumin, obtained from Curcuma longa, on the meiotic maturation of oocytes and apoptotic and necrotic death of follicular cells at immune ovary failure induced by immunization of animals with allogenic ovarian extracts. NF-kappaB plays a pivotal role in the induction of genes encoding pro-inflammatory factors (cytokines, adhesion molecules, inducible NO-synthase and cyclooxygenase) and in regulation of cell proliferation and death. It has been shown that immunization of mice increased the death of follicular cells through anapoptotic and necrotic pathways, which led to inflammatory response (according to blood leukogram and impairment the oocyte meiotic maturation at metaphase I and II).

[Proliferation and death of liver mononuclear cells in immune lesions induced by concanavalin A and anti-liver antibodies in mice].

Two types of experimental liver failure in mice were investigated to study the immune mechanisms of liver disease: 1) T-cell-mediated injury induced by administration of concanavalin A (ConA) and 2) antibody-mediated injury induced by administration of anti-liver antibodies (ALA, gamma-globulin fraction of sera from rabbits immunized with liver tissue). It was established, that both types of liver injury were accompanied by the activation of immune processes in the liver, as shown by the increase of liver mononuclear cell proliferation, estimated using IPO-38 monoclonal antibodies. In contrast to ConA treatment, the immune activation under ALA-treatment was also associated with the increase in the percentage of plasma cells and small lymphocytes in liver mononuclear cells.

[The protective effect of molsidomin in immune ovarian pathology in mice].

Experimental immune ovarian failure in CBA mice was induced by either administration of xenogenic anti-ovarian antibodies (scheme 1) or immunization with allogenic ovarian extracts (scheme 2). It was shown that both types of treatment impaired the meiotic maturation of oocytes: the number of cells at the stages of metaphase I and metaphase II decreased compared to the cells of control mice. In both schemes of experiments, impaired oogenesis was accompanied by reduction of percentage of viable follicular cells and by increase in the part of cells possessing morphological features of apoptosis.

[Effect of high-dispersed silica on the cultured rat hepatocytes].

Highdispersed silica (HDS) is an active substance of medicine "Siliks", which demonstrates high protein adsorption property and is used for hatching out toxic agents of protein origin. To discover new potential applications of this substance, it is necessary to study the direct effect of HDS on cell viability. We studied the effects of HDS in concentration 0,0001%, 0,001% and 0,01% on cultured rat hepatocytes at 4 and 24 hours.

[Effect of thromboxane B2 on morphological features of apoptosis in cultured rat hepatocytes exposed to hepatotropic substances].

Thromboxanes (TX) are known to have damaging effect on a liver but their influence on the cell death, in particular on hepatocyte apoptosis and its morphological features is not investigated enough. Cell death of the rat hepatocytes was investigated in primary culture by double vital staining with fluorescent nuclear stains Hoechst 33342 and propidium iodide and by electron microscopy. It was established that exogenous Tx B2 increases the amount of hepatocytes with early stages of apoptosis - the condensed chromatin and nucleus and cell size reduction.