Vol 96, No 5 (2019)

Aim. Isolation of ribonucleoprotein (RNP) of an attenuated rabies virus, develop schemes for immunizing animals with RNP-based preparations and determine the most effective scheme that allows obtaining serum with a high antibody titer to the RNP.

Materials and methods. We used the transplantable cell line Vero, the strain rabies virus «Moscow 3253 Vero», adapted for reproduction on Vero, rabbits of the chinchilla breed. In order to obtain serums containing antibodies to the RNP of the rabies virus, experimental schemes have been proposed for immunizing animals with RNP, including with adjuvants: polyoxidonium and colloidal gold. The dynamics of the accumulation of antibodies to the RNP of the rabies virus in the blood serum of experimental animals was studied by dot-immunoassay.

Results. The target component (RNP of the rabies virus) was isolated directly from the cytoplasm of the Vero cell culture infected with the rabies virus according to the modified M. Dastkhosh (2014) method, lyophilized and used in the development of preparations for immunizing experimental animals. In the study of the dynamics of the formation of antibodies to RNP of the rabies virus by the method of dot-immunoassay, the effectiveness of an adjuvant is established — colloidal gold nanoparticles ranging in size from 15 to 17 nm, the use of which makes it possible to increase the antibody titer by 2 times.

Conclusion. The results obtained are of interest for further research related to the design of diagnostic products and the development of methodological techniques using such preparations.

Aim. The work was performed with the purpose to study a hemolytic activity in the culture of S.pyogenes under the inhibitory action of millimolar concentrations of zinc ions.

Materials and methods. Suspensions of S.pyogenes bacteria which contained 108 CFU/ml were sown by the lawns into the standard Petri dishes coated with the supplemented Blood Nutrient Agar. 30 min later the salt solutions of zinc or copper which contained the metals at the concentrations ranged between 5 x 10-3 M to 5 x 10-1 M were added by the 5 μl drops on the surfaces of the lawns with use of 36-channel stamp replicator. Then the dishes with bacterial cultures were incubated for 24 hrs at 37°C followed by measuring diameter of the area of culture growth inhibition and of the area of inhibition of hemolysis. The study was performed with use of controls towards measuring the state of bacterial cells obtained from different zones of the areas.

Results. In presence of the zinc ions concentrations ranged between 50 to 500 mM the area of the growth inhibition of S.pyogenes was surrounded on the lawn of the bacterial culture by the area of the inhibition of hemolysis where the growth inhibition of S.pyogenes was not registered. Copper ions did not form such an area of the hemolysis inhibition.

Conclusion. Inhibitory action of zinc ions on the hemolytic S.pyogenes activity in the culture seems to be specific and reversible, and is discussed in a context of the antivirulent zinc ions properties.

The aim of the study was to study trigger factors in chronic urticaria, peculiarities in the expression of Toll-like receptors, clinical and immunological efficacy of microbial antigens in patients with chronic urticaria.

Materials and methods. Patients with chronic urticaria (134 patients). A study of the expression of TLR2, TLR3, TLR4, TLR9 on blood cells using flow cytometry. 62 patients received polyvalent bacterial lysate against baseline therapy per os, 72 patients received monotherapy with basic drugs.

Results. In patients with bacterial infection, high levels of TLR2, TLR4 expression were detected. In the presence of viral infections, high TLR3 expression values were observed. The use of PBL contributed to an increase in the number of patients with clinical remission, decreased urticaria activity, led to a correction in TLR2 and TLR4, and decreased the level of total IgE.

Conclusion. Inclusion in the complex of therapeutic and prophylactic measures in patients with urticaria of a chronic drug based on microbial antigens (polyvalent bacterial lysate) contributes to the increase of clinical effectiveness and activation of the links of innate immunity.

Aim. To study the formation of biofilms by freshly isolated and vaccine strains of Bordetella pertussis of different serotypes.

Materials and methods. The intensity of biofilm formation by B. pertussis strains in 96-well round-bottom polystyrene plates by using three sowing doses of microbial cells (1,25 IOU/ml, 2,5 IOU/ml and 5,0 IOU/ml) was estimated by staining with 0,1% gentian-violet solution. The results were interpreted after measuring the optical density (OP) of the colored solvent at a wavelength of 600 nm.

Results. The highest intensity of biofilm formation was found in the newly isolated strain No. 211 and vaccine strain No. 475, both belonging to serotype 1.2.3. Cultures of these strains formed dense biofilms at all sowing doses of microbial cells. Certain differences in the intensity of biofilm formation were found between freshly isolated and vaccine strains of serotypes 1.2.0 and 1.0.3, especially when using a sowing dose of 5,0 IOU/ml. Freshly isolated strains at this dose formed dense biofilms, while two of the three vaccine strains formed moderate biofilms, and one strain was dense.

Conclusion. The revealed differences between the strains of B. pertussis in the intensity of biofilm formation may be associated with the peculiarities of the expression of agglutinogens, as well as other surface structures of microbial cells involved in the adhesion process on the substrate.

We scanned the PubMed search database for literature on the incidence of nosocomial respiratory viral infections (NRVI) published over a ten-year period. Necessity to apply the standard case definition and the laboratory panel based on the multiplex polymerase chain reaction in frequency assessment was established. In general, predominance of rhinoviruses in the etiological structure was detected. Rationale was given for introduction of nonspecific epidemic prevention activities against a broad spectrum of other respiratory pathogens including high-priority respiratory syncytial viruses, metapneumoviruses, adenoviruses, influenza and parainfluenza viruses and coronaviruses. Bocaviruses and mimiviruses were designated as rare species. The biological diversity of the pathogens causing NRVI calls for active promotion of molecular genetics techniques in the work of the laboratory services of health facilities to perform quality etiological diagnosis, design relevant antiviral therapy regimens and effective prevention programs whose implementation will lead to significant reduction in the spread risk of these infections and the treatment costs.

The article presents the analysis of numerous scientific studies carried out in Russia with the use of pneumococcal polysaccharide vaccine in immunocompetent and immunocompromised patients. New data are available to assess the impact of vaccines on clinical and immunological aspects in a particular pathology in children, which allows to reveal the mechanisms associated with the effectiveness of vaccination.

The review is devoted to an analysis of the genetic diversity of the rubella virus. Historical and geographical data of the circulation of various genotypes of the rubella virus were presented. The tendency to reduce the genetic diversity of the virus in the world as a result of the rubella elimination programs have been shown.

The review presents the basic information available in the literature on changes in the composition of fatty acids in various microorganisms in response to various environmental factors (stressors). The issues affecting the importance of fatty acids as biomarkers of pathogenetic and adaptive-persistent potential of bacteria are discussed. The prospects of studying the spectrum of fatty acids in the field of biochemistry, in particular, lipidomics of infectious diseases are noted.

О.В.Бухарин, А.А.Стадников, Н.Б.Перунова. Роль окситоцина и микробиоты в регуляции взаимодействий про- и эукариот при инфекции. Екатеринбург, УРО РАН, 2019, 247 с.