Anti-Biofilm Activity of Polyazolidinammonium Modified with Iodine Hydrate Ions against Microbial Biofilms of Uropathogenic Coliform Bacteria.

The dynamics of microbial biofilm formation by standard strain and by clinical strains of uropathogenic coliform bacteria was investigated in vitro and the effect of sublethal concentrations of the polymer compound polyazolidinammonium modified with iodine hydrate ions on the initial stages of biofilm formation was assessed. Treatment of immunological plate wells with the polymeric compound prevented film formation, especially in case of clinical E. coli strain carrying FimH virulence gene.

[The specific features of corpse putrification under the influence of necrobiome enzymatic systems]. / Spetsifika putrifikatsii trupa pod deistviem fermentnykh sistem nekrobioma.

The objective of the present study was to characterize the specific features of corpse putrification under the influence of necrobiome enzymatic systems depending on the duration of the post-mortem period. We present the results of investigations into the enzymatic activity of the dominant species of microorganisms making up the post-mortem microbiome. The domestic pork carcasses weighing 50-70 kg were used as an experimental putrification model. The study revealed the characteristic features of protein decomposition under the influence of proteolytic enzymes of pseudomonads, bacilli, and clostridia, such as alteration in the amount of necrobionts producing proteases in the entire carcass and its fragments during biodegradation in the air over 30 and 136 days of the post-mortem period. A series of experiments designed to evaluate the effectiveness of protein hydrolysis by necrobionts have demonstrated the dependence of the rate of biodegradation on the environmental temperature, duration of the putrification pocess, and the species composition of the necrobiome.

[ANTIMICROBIAL ACTIVITY OF POLYAZOLIDINAMMONIUM, MODIFIED WITH HYDRATE-IONS OF IODINE].

AIM: Study of antimicrobial activity of a polymer compound--polyazolidinammonium, modified with hydrate-ions of iodine. MATERIALS AND METHODS: Antimicrobial activity of polyazolidinammonium, modified with hydrate-ions of iodine, against reference strains and clinical isolates of Gram positive and negative bacteria, microscopical fungi, as well as RNA viruses was studied. RESULTS: High antibacterial activity of the studied compound was established, especially against Gram positive bacteria. A higher concentration of the preparation (125-250 µg/ml) was characterized by anti-fungal effect. A high sensitivity to polymer of swine transmissible gastroenteritis virus was noted. CONCLUSION: The polymer compound, based on the results of the studies, is a perspective antiseptic and etiotropic means for control of infectious disease causative agents.

[Effect of Paenibacillus polymyxa lectin on cytokine status of animals].

AIM: To study effect of lectin L II of Paenibacillus polymyxa 1460 on cytokine status of mice during modeling of infections caused by Staphylococcus, Escherichia and Yersinia. MATERIALS AND METHODS: Lectin LII of P. polymyxa 1460, bacterial cultures Staphylococcus aureus 209-P, Escherichia coli O1, and Yersinia enterocolitica 12 were used. Mice were inoculated intraperitoneally with 0.2 ml of suspension of bacterial culture grown during 24 hours (5,000 m.c./ml). Lectin (0.4 mcg/ml) in dose 0.2 ml was administered 24 h before and 1 h after inoculation. Serum samplesfrom sacrificed animals were obtained 1, 6, and 24 hours after inoculation and concentrations of IL-1, IL-6, and TNF-alpha were measured in them using optical density values. RESULTS: It was established that level of TNF-alpha in serum decreased during staphylococcal infection, whereas levels of IL-1 and IL-6 decreased during all modeled infections. Ability for correction of cytokine balance in organism of experimental animals by administration of lectin 24 h before and 1 h after inoculation with bacteria was demonstrated. CONCLUSION: Presented studies testify to the effect of bacterial lectin on cytokine-production activity of macrophages during phagocytosis of bacteria and infectious process.

[The role of Paenibacillus polymyxa lectin in the macrophages-mediated killing of bacteria].

Influence of lectin LII of Paenibacillus polymyxa 1460, specific for galactosamine, glucuronic acid, fructose-1,6-diphosphate, and glucosamine, on mechanisms of oxygen-dependent and oxygen-independent killing of bacteria was reviewed. It was shown that the lectin modulates the activity of some microbicide factors in the cytoplasm of macrophages before phagocytosis. Increased activity of myeloperoxidase and acid phosphatase, enhanced formation of active forms of oxygen in alveolar macrophages, increased level of cationic proteins and decreased activity of alkaline phosphatase in peritoneal macrophages was observed.

[A study of the functional activity of macrophages of peritoneal exudate of mice exposed to low-intensity laser radiation in vitro and in vivo].

The effect of low-intensity laser radiation generated by semiconductor devices in the red (650 nm) and infrared (850 nm) regions of the spectrum in vitro and in vivo on the phagocytic activity and synthesis of proinflammatory cytokines by peritoneal macrophages during the phagocytosis of bacterial cells has been studied. A culture of the clinical strain of the enteropathogenic bacterium Escherichia coli was used as an object. The radiation dose was varied by changing the power and duration of exposure. The results obtained indicate that infrared low-intensity laser radiation has a stimulating effect on the phagocytic activity of macrophages. It was shown that the effect of low-intensity laser radiation on the activity of the phagocytic process, the enhancement of the adhesion of bacteria by macrophages, killing of bacteria, and the production of proinflammatory cytokines is dose-dependent. The exposure to the rays of the red region of the spectrum on phagocytizing macrophages induced a decrease in their activity; as the dose was increased, the destruction of cells was registered.

[Lectin of Yersinia pestis vaccine strain EV and its immunological properties]. / Lektin vaktsinnogo shtamma Yersinia pestis EV i izuchenie ego immunobiologicheskikh svoistv.

As the result of the chromatographic separation of Y. pestis EV membrane proteins, a protein fraction with hemagglutinating activity was obtained. The isolated preparation was glycoprotein with a molecular weight of 22 kD, contained 16% of carbohydrates and exhibited thermolabile properties. The determination of the carbohydrate specificity of this glycoprotein revealed that it belonged to the class of lectins. Changes in the content of 11 corticosteroids and the population composition of lymphocytes, as well as the detection of specific antibodies in the blood serum of guinea pigs immunized with lectin, were indicative of the fact that the preparation was sufficiently immunogenic and induced the activation of the processes of proliferation and activation of lymphocytes during immunogenesis. The lectin isolated from Y. pestis EV outer membrane may be regarded as an additional factor ensuring the contact of the pathogen with the cells of the body and as a promising component of combined plague vaccine.

[Effect of Azospirillum brasilense lectin on the kinetics of lymph nodes cell populations and cytokine status in experimental animals]. / Vliianie lektina Azospirillum brasilense na kinetiku kletochnykh populiatsii mezenterial'nykh limfaticheskikh uzlov i dinamiku tsitokinovogo statusa éksperimental'nykh zhivotnykh.

The complex study of the influence of A. brasilense Sp 7 lectin with carbohydrate specificity to L-fucose and D-galactose on the dynamics of cell populations in different structural functional zones of the white mice mesentery, as well as on the capacity of immunocompetent cells of mesenterial lymph nodes for synthesizing cytokines (interleukin-1, interleukin-6 and tumor necrosis factor), was carried out. A single oral administration of bacterial lectin in a dose of 4.5 micrograms produced a pronounced immunostimulating effect.