Voprosy meditsinskoi khimii最新文献

Experimental uveitis is characterized by a pronounced lipid peroxidation (LPO) in damaged tissues of eye, which is complicated by reduced activity of the antioxidant enzymes, SOD and catalase. The intensification of LPO was also found in blood serum and hepatic tissue. However, hepatic lipid peroxidation was accompanied by compensatory increase of catalase activity. The activity of antioxidant defence enzymes decreased in blood, whereas catalase was activated in hepatic tissue. The therapeutic effect was accompanied by a decrease of LPO products and increase of activity of the antioxidant enzymes in all tissues. Treatment of uveitis with gentamycin and, especially, perftoran reduced inflammatory events.

The effect of UV radiation in vitro on the level of ascorbate, SH-groups and glutathione reductase activity in the soluble fraction of bovine eye lens was studied. UV-Irradiation increased NADPH-oxidoreductase activity, the level of ascorbate oxidation and decreased the content of SH-groups and activity of glutathione reductase. Significant activation of the NADPH-oxidoreductase activity in the presence of ascorbate and Cu2+ was observed after UV-irradiation. It is suggested that ascorbate may play an important role in the UV-induced lens pathology.

The results of NSE purification procedure, as well as hybridoma technology of anti NSE monoclonal antibodies synthesis are presented. The employment of this procedure yielded highly purified NSE preparation. The immunization of BALB/C mice with NSE preparation led to sensitization of the immunocompetent cells, which could form hybridomes, producing the anti-NSE monoclonal antibodies, after the confluence with myeloma cells Sp 2/0-Ag 14. The ELISA test-system for NSE analysis was developed on the basis of highly purified NSE preparation and monoclonal anti-NSE antibodies. This system was characterized by high specificity, accuracy and reliability. This system may be recommended for analysis of blood-brain barrier functions in the neurological and psychiatric diseases.

The levels of blood lymphocyte NAD(P)-dependent dehydrogenases were investigated in children and teenagers with different duration of insulin-dependent diabetes mellitus (IDDM). The level of some NAD(P)-dependent dehydrogenases changed proportionally in dependence of IDDM duration and insulin therapy did not restore their activities to the normal level. It is suggested that these changes may reflect decrease of energy metabolism and plastic processes in blood lymphocytes from diabetic children and teenagers reflecting. These changes correspond to altered functional reactivity of immunocompetent cells and represent metabolic basis of immunopathogenic complications of IDDM.

A long-term treatment of female rats with CCl4 caused a decrease of glutamine content in the liver. This decrease may be attributed to stable reduction of glutamine synthetase activity and slightly elevated (or unchanged) phosphate-dependent glutaminase. Partial hepatectony (15-20% of the liver) did not normalise glutamine metabolism.

Comparative effects of the partial opiate agonists buprenorphine and butorphanol on the phospholipid composition of liver cell plasma membranes were investigated in cats under conditions of hemorrhagic shock. Buprenorphine administration (0.03 mg/kg) normalized the level of phosphatidylinositol. The higher dose (0.3 mg/kg) induced additional disturbances in the phospholipid composition of liver cell plasma membranes by increasing the content of phosphatidylserine and by decreasing the contents of sphingomyelin and lysophosphatidylcholine. The protective effect of butorphanol on liver cells was more pronounced than that of buprenorphine.

Blood antioxidant enzymes (superoxide dismutase, catalase, ceruloplasmin) were investigated in gestational ages and diseases. Low activity of blood superoxide dismutase and catalase were observed in premature babies and in newborns after acute and chronic hypoxia. In hemolytic disease the activity of antioxidant enzymes of newborns was significantly higher than in healthy infants. This work demonstrates advantages of haemosorbtion compared to exchange blood transfusion. So the antioxidant activity in blood, decreased after blood transfusion, remained at a high level after haemosorbtion. Any deficiency of antioxidant enzymes in newborns may lead to toxyc oxygen effects. Antioxidants are potential therapeutic agents in the above mentioned conditions.

The ability of thyroliberin (TRH) to interact with opioid receptors (OR) was studied using radioligand analysis. TRH did not influence specific binding of [3H]-naloxone, but increased affinity of high affinity binding sites for the ligand in a dose-dependent manner. TRH also decreased affinity of low- affinity binding sites. Kinetic analysis of low-affinity binding sites suggests the existence of at least two subpopulations of OR, which differed in their affinity to naloxone and mode of interaction with TRH. TRH acted as non-competitive and competitive inhibitor of receptor binding sites with the lowest and moderate affinity, respectively. The allosteric pattern of TRH influence on OR with high and the lowest affinity to naloxone was suggested. TRH analogues were estimated for their ability to change in OR binding characteristics. The level of [3H]-DADL specific binding was not influenced by the peptides tested but the affinity was changed. Blind control experiment showed the ability of the TRH relative substances to increase in affinity of d-receptors could be ranked in the row: dihydroorotyl-hystidyl-prolinamide > TRH > methionyl-asparagyl-phenylalaninamide. This is consistent with ability of these compounds to influence the dopaminergic events.

The pharmacological approaches to the treatment of type 2 diabetes mellitus were reviewed. Special attention was paid to the new therapeutic agents that are able to decrease plasma glucose levels. The possible mechanisms of the hypoglycemic effects are discussed. Briefly, repaginide, nateglinede and alpha-glucosidase inhibitors prevent postprandial hypoclycemia while thiazaolidinediones improve the sensitivity to insulin and vanadium compounds act as an insulin action enhancer.

The possibility of numerical-heuristic approach has been examined for proteome map analysis that realized by neural network processing of 2D protein electrophoregramms. The fetal alcohol syndrome was used to illustrate that this approach islatively effective for diagnostics of diseases.