Irina V Rybina

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Endothelial cells contain leukotriene (LT) A4 hydrolase (LTA-H) as detected by Northern and Western blotting, but several studies have been unable to detect the activity of this enzyme. Since LTA-H could play a key role in determining what biologically active lipids are generated by activated endothelium during the inflammatory process, we studied possible(More)
The outer mitochondrial membrane of beef heart was disrupted by hypotonic treatment and the effects of concentration and ionic strength of creatine kinase substrate solutions and some other electrolytes and non-electrolytes on mitochondrial membrane creatine kinase were studied. It was shown that electrostatic forces play an important role in the binding of(More)
The emergence of sphingosine-1-phosphate lyase (SPL) as a promising therapeutic target for inflammatory diseases has heightened interest in the identification of small molecules that modulate its activity. The enzymatic activity of SPL is typically measured using radiometric or fluorescence-based assays that require a lipid extraction step, or by direct(More)
Vascular adhesion protein-1 (VAP-1), also known as semicarbazide-sensitive amine oxidase (SSAO) or copper-containing amine oxidase (AOC3, EC, catalyzes oxidative deamination of primary amines. One endogenous substrate has recently been described (Siglec 10), and although its mechanism of action in vivo is not completely understood, it is suggested(More)
Vascular adhesion protein-1 (VAP-1) has been implicated in the pathogenesis of inflammatory diseases and is suggested to play a role in immune cell trafficking. It is not clear whether this effect is mediated by the oxidase activity or by other features of the protein such as direct adhesion. In order to study the role of VAP-1 oxidase activity in vivo, we(More)
Leukotriene A4 hydrolase (LTA-H) is a bifunctional protein that has aminopeptidase activity, but also contains an epoxide hydrolase activity that converts leukotriene (LT)A4 to LTB4. The lipid metabolic activity of this enzyme plays a central role in the control of polymorphonuclear leukocyte function and in the development of inflammation. LTA-H is widely(More)
Content of 14C-phenazepame and its metabolites was studied in feces and urine of mice strains C57BL/6 and BALB/ c after intraperitoneal administration of the preparation at a dose of 14 mg/kg. Concentration of phenazepame and of its trihydroderivative was higher in urine of the BALB/c strain mice than in C57BL/6 strain that corresponded to genetic(More)
i. S. N. Lyzlova, Vopr. Med. Khim., 33, No. 5, 43 (1987). 2. A. M. Mayanskii and D. M. Mayanskii, Essays on the Neutrophil and Macrophage [in Russian], Novosibirsk (1983). 3. Z. I. Sukhova, V. V. Ivanitskaya, and Yu. P. Sergeev, Abstracts of Proceedings of the 3rd All-Russian Congress on Remedial Gymnastics and Sport Medicine [in Russian], Sverdlovsk(More)
Creatine kinase from pigeon breast muscle was obtained in a homogeneous (as evidenced from polyacrylamide gel SDS electrophoresis) state. The molecular mass of the enzyme monomer is 43,000. Ultracentrifugation in a sucrose density gradient and gel filtration revealed that the enzyme is present in solution as a mixture of two major forms, i.e., octamer and(More)
The metabolic rate of 14C-phenazepam (14 mg/kg) in male C57BL/6 and BALB/c mice and F1 hybrids (BALB/c X C57BL/6) and the anticonvulsant effect of the tranquilizer in hybrid mice were studied. It was demonstrated that oxidation of the phenazepam molecule in the third position in BALB/c mice and in F1 hybrids proceeded at a higher rate than in C57BL/6 mice.(More)