Vol 5, No 3 (2015)

REVIEW ARTICLES

СAPSULAR ANTIGEN OF YERSINIA PESTIS

Kadnikova L.A., Kopylov P.K., Dentovskaya S.V., Anisimov A.P.

Abstract

Plague is a zoonosis caused by gram-negative bacteria Yersinia pestis, which, as a rule, is transmitted to humans from septicemic rodents by the bites of infected fleas. This microbe killed more people than all of the wars in the human history. Y. pestis circulation in the natural plague foci is ensured by the whole number of pathogenicity factors with differing functional orientation. This review is devoted to one of them, Y. pestis capsular antigen (F1 or Caf1). The history of its discovery and studying of its genetic control, biosynthesis, isolation and purification, and physicochemical properties are reviewed. Its roles in plague pathogenesis and its application as a main component of plague vaccines are also discussed. Y. pestis capsule under light microscopy is visually amorphous, while high-resolution electron microscopy displays the structure formed from separate fimbria-like cords up to 200 nm long, diverging from the bacterial surface in different directions. At 37°C Y. pestis produce 800–1000 times more capsular antigen than at 28°C. Genes coding for 17.6-kD Caf1 protein, which contains 170 amino acids, are located in caf1 operon of pFra plasmid. Analysis of caf1 operon nucleotide sequence testified its close phylogenetic relationship with the gene clusters coding for pilus adhesins that were secreted with the help of chaperone/usher systems in enterobacteria including six additional adhesins in Y. pestis. Y. pestis multiplication within macrophages is the obligatory stage of plague pathogenesis, and the plague pathogen virulence correlates not with resistance to phagocyte ingesting but with bacterial ability to survive and multiply within phagolysosomes of phagocytes due to neutralization of antibacterial functions of eukaryotic cells. The capsule formed out of the Caf1 aggregates protects Y. pestis from ingestion by naïve host’s phagocytes and prevents from initiation of the alternative pathway of the complement system. Molecular usher Caf1A responsible for capsular antigen anchoring on the surface of bacterial cell has a high affinity to human interleukin 1β. Caf1 can compete with interleukins 1α, 1β, and 1ra in binding to receptors on lymphoid cells preventing development of adequate immune response. Immunodiagnosis of plague is based on detection of Caf1 or anti-Caf1 antibodies since this Y. pestis antigen is species specific. Covering bacterial surfaces capsular antigen is also the paramount component of all modern plague vaccines. Its leading role in induction of intense immunity in mice, rats, monkeys, and men was shown clearly. However, non-capsulated (Caf1) variants of Y. pestis keeping their virulence at the level of the wild-type strains might be selected and accumulated in immune animals. This indicates inadmissibility of application of monoantigen plague vaccines and necessity for design of immunoprophylactic preparations aimed at two or three molecular targets. 

Russian Journal of Infection and Immunity. 2015;5(3):201-218
pages 201-218 views

ORIGINAL ARTICLES

REACTIVITY AND ENDOGENOUS INTOXICATION CELLULAR TESTS OF THE FIRST TIME DIAGNOSTED SOCIALLY ADOPTED PATIENTS WITH INFILTRATIVE LUNG TUBERCULOSIS

Mordyk A.V., Puzyreva L.V., Batishcheva T.L.

Abstract

The purpose of the research was to assess the endogenous intoxication degree and reactivity condition of an organism by calculation the blood leukocyte indexes and their influence assessment for the outcome of first time diagnosed infiltrative lung tuberculosis for the revealed socially safe patients. Case-records of 260 patients were analysed retrospectively. Inclusion criteria were: first time diagnosed and confirmed diagnosis of infiltrative lungs tuberculosis; age at least 18 years; socially adopted patients (the patients taking official or informal work place), the constant income in a family, a residence, a registration. Exception criteria were: extra pulmonary or other forms of lung tuberculosis at the patient; existence of a serious somatic illness; HIV infection; existence of malignant new growths; mental diseases; the social disadaptation (homeless persons who aren’t working, released from jails or being under examination, abusing alcohol in the form of hard drinkings and accepting drugs). All patients included in research were divided into two groups: first (main) — patients with a failure in quantity the 66, second (group of comparison) — patients with a favourable outcome of infiltrative tuberculosis of lungs, in number of 194. Failure criterion was the existence (preservation) of a disintegration lung cavity confirmed by the last X-ray picture. According patients blood test results the intoxication leukocyte index (ILI, with Kalf-Kalif formula), an blood leukocytes shift index (BLSI), an organism resistance index (ORI), a Dashtayants nuclear index was carried out. Followly the Spirmen correlation analysis with Statistica 6.0 software package was estimated. As a result of research the following data were obtained. The Dashtayants nuclear index high level at primary blood test has the strongest impact on development of infiltrative lungs tuberculosis failure in patients; the ILI and BLSI high levels at the time of the beginning of therapy have moderate negative impact. The ORI low level at the time of an treatment initiation had weak positive impact on development of a failure of tuberculosis, and weak negative — rendered the LII high level after the first month of treatment and high BLSI in 2 months of intensive treatment in a hospital. The complex assessment of integrated indexes of blood allows judging objectively weight of a condition of the patient, need and duration of desintoxication therapy that influences an outcome of the main disease. 

Russian Journal of Infection and Immunity. 2015;5(3):219-224
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MICROBIAL LANDSCAPE OF MICROFLORA OF A PHARYNX AT PATIENTS WITH TONSILLIT’S PATHOLOGY

Borisova O.Y., Aleshkin V.A., Pimenova A.S., Krukov A.I., Kunelskaya N.L., Gurov A.V., Shadrin G.B., Tovmasyan A.S., Efimov B.A., Kafarskaya L.I.

Abstract

The microbial landscape of microflora of a pharynx at patients with tonsillit’s pathology were studied. Materials and methods. 79 patients from GBUZ “Research Institute of Clinical Otorhinolaryngology” (78.5% patients with various forms of chronic tonsillitis and 21.5% of patients without chronic tonsillitis (control group). Among patients of the main group with chronic tonsillitis, at 60 (96.8%) patients there was a diagnosis chronic tonsillitis a toxical-allergic form of 1 degree (TAF I), at 1 (1.6%) the patient — chronic tonsillitis a toxical-allergic form II of degree (TAF II) and at 1 (1.6%) the patient — chronic tonsillitis. Identification of microorganisms carried out on cultural-morphological and biochemical properties. Specific identification of the hardly cultivated microorganisms and Corynebacterium was carried out by MALDI-TOFF MS of BioMerieux VITEK MS MALDI-TOF (“bioMerieux”, France). Identification of the allocated Corynebacterium was carried out by amplification of a gene rpoB and the subsequent direct sequencing. Results. The majority (98.7%) of the allocated microorganisms, treated 27 types and were Gram-positive. It is revealed 159 strains of 29 species of microorganisms, from them 41.4% of strains belonged to the Streptococcus, 19.7% — Staphylococcus, 36.9% — Corynebacterium. Among Streptococcus — 55.4% of S. viridans, 38.4% — S. pyogenes and 3.1% — of S. pneumoniae и S. oralis; Staphylococcus — 64.5% of S. aureus, 32.2% of S. epidermidis and 3.3% of S. hominis. 18 types of Corynebacterium С. tuberculostearicum (17.2% strains), C. рseudodiphtheriticum (15.5% strains) and C. aurimucosum (18.9% strains) are revealed. At 44.3% of the surveyed patients the microflora is presented by a monoculture and at 55.7% associations are revealed. Conclusion. The microflora at patients with tonsillit’s pathology is characterized. At the expressed pathological process in a microbiota of a pharynx the monoculture while existence of associations testifies to less expressed pathological process prevails. 

Russian Journal of Infection and Immunity. 2015;5(3):225-232
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NEPHRITOGENIC ACTIVITY OF STREPTOCOCCUS PYOGENES emm1 AND emm12 GENOTYPES ISOLATED FROM PATIENTS AND ASYMPTOMATIC CARRIERS

Burova L.A., Pigarevsky P.V., Snegova V.A., Kuleshevich E.V., Zharkov D.A., Schalen C., Totolian A.A.

Abstract

In this paper the nephritogenic activity of Streptococcus pyogenes genotype emm1 and emm12 clinical isolates from scarlet fever patients and healthy children was considered. As earlier established, strains of these types differ in Fc-binding profile, interacting with native IgG and immune complexes (IC), respectively. As expected, all the type emm1 strains bound native IgG; besides, ICs interacted only with strains from patients but not with those from carriers. In contrast, all type emm12 strains appeared to be negative for native IgG, whereas ICs were bound by strains from patients exclusively. None of the tested strains bound IgG3. By immunization of rabbits, binding of native IgG as well as ICs was associated with increasing of anti-IgG antibodies titer, formation of ICs, «crescent» deposition of IgG and C3-complement, local production of the proinflammatory cytokine TNFα, аnd also with accumulation of lymphocytes in kidney tissue. These signs indicated immune inflammation, leading to experimental membrane-proliferative glomerulonephritis (PSGN). It is known that PSGN development depends on IC-binding by tissue FcγR, on complement activation as well as on tissue infiltration by macrophages/monocytes. According to the data of morphometric evaluation the nephritogenic activity of the type emm12 strains exceeded those of type emm1. On testing of three IC-binding emm12 strains in six rabbits, typical PSGN developed in 5 of them and an abortive process in 1 animal. In case of five IgG-binding type emm1 strains, out of ten rabbits full-blown PSGN was observed only in 3 of them, but abortive changes in 5 and negative result in 2 animals. No pathologic changes were elicited by the «carrier» strains of either genotype; the inability of these to bind ICs, according to literature data, could be explained by mutation in the Mga-regulator gene thereby impeding M-proteins synthesis. We conclude that isolation of type emm12 IC-binding strains at acute streptococcal infection should be considered a high risk-factor for postinfectious sequelae development. The rabbit model of PSGN used in this research thus allowed to reveal some main stages and features of its pathogenesis. 

Russian Journal of Infection and Immunity. 2015;5(3):233-242
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VIRAL ETIOLOGY ACUTE INTESTINAL INFECTIONS MOLECULAR MONITORING IN CHILDREN’S HOSPITAL

Sergeeva A.V., Poslova L.Y., Kovalishena O.V., Blagonravova A.S., Epifanova N.V., Sashina T.A., Morozova O.V., Novikova N.A.

Abstract

On the territory of the Russian Federation in the overall structure of acute intestinal infections the proportion of viral diarrhea among children varies from 24 to 78% of cases depending on the season. The acute viral intestinal infections etiological confirmation is performed mainly among patients of infectious hospitals. The prevalence of viral acute intestinal infections in non-infectious hospitals, including infections associated with medical care, remains unclear. Currently estimation of viral component in the acute intestinal infections overall structure mainly consists in determination of rotavirus infection prevalence excluding other pathogens. As the part of viral etiology hospital infections epidemiological surveillance in non-infections children’s hospital the study of acute viral intestinal infections etiological structure and molecular genetics characterization of identified enteric viruses is conducted. The syndrome diagnosis of acute intestinal infections cases was introduced an identification and evaluation of patients with signs of dysfunction of the gastrointestinal tract, that is not related to the underlying disease. A set of laboratory methods included identification of various intestinal pathogens DNA (RNA) by PCR-RT method; genotyping of enteric viruses using sequencing; nucleotide sequence analysis of cDNA fragments using the BLAST software package for identification of closely related strains and an online service for automatic genotyping of noroviruses by Norovirus Genotyping Tool Version 1.0. Alignment of nucleotide sequences and phylogenetic analysis was performed using the software MEGA 5.0. The obtained sequence fragments of the genome was downloaded in GenBank international database. The use of molecular genetics research methods allowed to differentiate viral pathogens of acute intestinal infections and to establish the fact of nosocomial transmission. The proportion of viral etiology acute intestinal infections in patients with clinical signs of intestinal infection, and contact persons was 43.8%. The etiological structure of intestinal virus infections was presented by noroviruses (73.2%) genotypes GII.1, GII.3, GII.4 Sydney 2012, rotaviruses (23.2%) genotypes G4P[8] and G1-IP[8], and adenovirus (1.8%) of the group F and astroviruses (1.8%) genotypes 1 and 2. Among the hospitalized children were 9 cases of viral etiology acute intestinal infections importation, and 66 of cases were of nosocomial origin. Examination of the environment revealed the presence of contamination by enteric viruses in 47.8% of cases. 

Russian Journal of Infection and Immunity. 2015;5(3):243-252
pages 243-252 views

CORRELATION BETWEEN CD4 LYMPHOCYTES, VIRAL LOAD AND L-LYSINE PLASMA LEVEL IN HIV-INFECTED PATIENTS

Butorov E.V.

Abstract

Introduction.HIV-infection is associated with significant pathological changes of the host metabolic processes, such as energy dysfunction, dyslipidemia, protein catabolic effects and amino acid imbalance, which ultimately form the polymorphism of clinical symptoms of the disease. The significant disturbances of protein and lipid metabolism are widely described in asymptomatic and advanced stage HIV-infected patients, but infection-related amino acid abnormalities is not fully explored. The further research of HIV impact on the host metabolic processes in particular, the plasma amino acid profile, are essential for understanding the pathophysiology of HIV-infection. Our aim was to determine the association between CD4 lymphocytes, viral load and plasma L-lysine levels in clinical stages HIV-infected patients. Material and methods.A total of 750 HIV-1-infected males before highly active antiretroviral therapy (HAART) monitored in our center. The patients were classified into four stages of the disease 3, 4a, 4b and 4c, according to the classification system for HIV-infection in Russian Federation (2006). Quantitative HIV-1 RNA assay was performed using (RT-PCR) reverse-transcriptase polymerase chain reaction. The plasma L-lysine levels were assessed by thin layer chromatography (TLC). Results. We observed that plasma L-lysine concentrations markedly decreased with the clinical stages of HIV-infection. Low levels of essential amino acid were found in 57% of HIV-infected subjects in the asymptomatic stage (3), 67% and 68% in the advanced stages (4a and 4b, 4c, respectively). Our data revealed that plasma amino acid concentrations were positively correlated with CD4 count lymphocytes (P < 0.01) and inversely with HIV viral load (P < 0.05) in the total cohort. The mean L-lysine acid levels were significantly lower in advanced stage (4a and 4b, 4c) HIV-infected patients than in controls and asymptomatic stage (3) patients (P < 0.01 and P < 0.001, respectively). Conclusion. There was evidence of the association between plasma L-lysine and HIV-1 RNA level, immunological markers and clinical stages of HIV-infection among the entire cohort. The results show that advanced stages of HIV-infection are characterized by significant changes in plasma L-lysine concentrations with the disease stages of HIV-infection. Levels of this basic amino acid negatively correlating with viral load and inversely with CD4 count lymphocytes. These findings are important for understanding the pathophysiology of HIV-infection and the development of new approaches in the treatment. Although the mechanism is at present conjectural, the influence of plasma L-lysine on the HIV-1 RNA levels must be considered and remains to be proved. 

Russian Journal of Infection and Immunity. 2015;5(3):253-264
pages 253-264 views

NEW METHOD FOR DETERMINING HEPATITIS B VIRUS RESISTANCE MUTATIONS M204I/V TO NUCLEOS(T)IDE ANALOGUES IN PATIENTS WITH CHRONIC HEPATITIS B

Elpaeva E.A., Komissarov A.B., Pisareva M.M., Grudinin M.P., Kiselev O.I.

Abstract

Аnalogues of nucleos(t)ides (AN) such as lamivudine (LAM), telbivudine (TBV), adefovir (ADP), entecavir (ENT) are widely used for the treatment of chronic hepatitis B (CHB). However, the prolonged treatment using these drugs often leads to the development of drug resistance. The most common substitutions in the reverse transcriptase are methionine for valine (rtM204V), or methionine for isoleucine (rtM204I) at position 204. Early AN-resistant mutations detection is of great importance to determine the treatment strategy of patients with CHB. Currently there are many highly sensitive methods for detection of drug resistance mutations, such as next-generation sequencing, reverse hybridizationbased line probe assay (LiPA), mass spectrometry. However, these methods require expensive equipment and reagents, and they are not widely used in clinical laboratories. The aim of this study was to develop a simple and accurate real-time PCR method for detection of rtM204I/V mutation. This method showed high specificity and sensitivity (1000 copies/ml), it is less laborious and does not require additional equipment, fast and cost effective compared to other methods. HBV mutations of resistance to AN were determined in 5 groups of patients with CHB. Patients of the first group received monotherapy with pegylated interferon (n = 12), the second group — lamivudine (n = 10), the third group — telbivudine (n = 7), the fourth group — entecavir (n = 15). The fifth group consisted of patients who did not receive antiviral therapy (n = 3). The frequency of mutations in HBV polymerase YMDD-motif was determined among 47 patients with CHB: it was 10% for lamivudine treated patients, 20% — for entecavir, 28% — for telbivudine. YIDD/YVDD motifs were identified in two patients and YMDD/YIDD — in one patient. Real-time PCR method for the detection of AN-resistant rtM204I/V mutations in HBV polymerase can be used in routine diagnostics for primary screening of patients not responding to AN treatment. The application of this method can reduce the number of samples for in-depth study of primary and compensatory mutations of resistance to AN by sequencing method. The developed method versus Sanger-sequencing is fast, economical, and provides the detection of minor variants of HBV populations. 

Russian Journal of Infection and Immunity. 2015;5(3):265-272
pages 265-272 views

SHORT COMMUNICATIONS

THE IMMUNOCOMPETENT CELLS RECEPTORS RESEARCH UNDER EXPERIMENTAL INFLUENZA INFECTION IN VITRO

Lisakov A.N., Nagieva F.G., Barkova E.P., Gaiderova L.A., Fedotov A.Y., Nikulina V.G., Gavrilova M.V.

Abstract

Introduction. It is known that interferon is a cytokine and is a substantial part of the immune system necessary for antigenic challenge immune response full expression. Also it is considered that every antigen is an interferon inducer. Interferon induces antivirus response via binding to specific receptors, this receptors can be revealed straight on cell membranes of immune cells. Research objective. To evaluate the interferon inducer ability of some Influenza A virus strains upon indications of receptors functional activity (capacity) to alpha and gamma interferons on peripheral mononuclear blood cells (PBMC) induced in vitro by different Influenza A virus strains. Material and methods. The method is based on lymphocytes separation from the venous heparinized blood, with followed by in vitro lymphocytes inducing at temperature 36.5°С in the presence of 5% CO2. Blood samples were taken in different time intervals, labelled by mouse anti-idiotipyc FITCconjugated antibodies, structurally simulated human alpha and gamma interferon, samples were fixed with paraformaldehyde. Interferon receptors expression were performed by flow cytometer. Results. The in vitro experiments have determined the interferon-inducing ability of three influenza virus strains: A/PR8/34 (H1N1), A/Krasnodar/101/59 (H2N2) and A/ Ryazan/6103/87 (H3N2). MPBC blood sample (blood group was 0, Rh factor – positive) was induced by irradiated noninfectious allantoic fluid with hemagglutinating activity. Expression of alpha and gamma interferon receptors (alpha and gamma IFNR) on MPBC was determined by IFNR markers labelled with FITC and it (expression) was estimated by flow cytometer. In parallel we compared expression of alpha and gamma IFNR on MPBC in primed and non primed cells by low doses of human alpha interferon. It was found that expression of alpha and gamma IFNR on MPBC, induced influenza A/ PR8/34 (H1N1) antigen, with high hemagglutinating activity was higher in primed MPBC in comparison with non primed and higher then expression was induced by influenza virus A/Krasnodar/101/59 (H2N2) and A/Ryazan/6103/87 (H3N2) with lower hemagglutinating activity. It should be noted that IFN alpha receptor (IFNAR) expression on induced by influenza virus strain A/PR8/34 (H1N1) and primed by low doses of alpha interferon, repose on high level from induction point (1 hour) and protract during high level during 5 hours. Evaluation of gamma IFNR (IFNGR) expression level on MPBC induced by different influenza virus strains testify that firstly up-regulation IFNGR expression on MPBC primed by low doses of alpha interferon is absent and secondly up-regulation IFNGR on MPBC bear no relation with hemagglutinating activity of Influenza virus antigen. Conclusion. Experiment results clearly suggest that all influenza strains used carry the interferon induced ability which is possible to see by expression of IFNAR and IFNGR on MPBC induced by described above virus antigens. Rate of interferon induce ability in different influenza virus A connected on one side with virus hemagglutinating activity level in estimating IFNAR and on the other side with virus strains in estimating IFNGR. 

Russian Journal of Infection and Immunity. 2015;5(3):273-278
pages 273-278 views

LABORATORY TESTING RESULTS ANALYSIS OF GIARDIASIS PREVALENCE AMONG DIFFERENT POPULATION GROUPS IN THE NENETS AUTONOMOUS DISTRICT

Bobyreva N.S., Degteva G.N.

Abstract

The Nenets Autonomous District (NAD) refers to the territories of the Russia’s Far North. The country is the only region of Russia, where there are still no roads. The extreme weather conditions, as well as residential patterns in the NAD reduce the availability of specialized medical care, as indigenous people and other nationalities living in the district, which requires the use of health care management specific forms. The article presents data on giardiasis studies amongst different categories of the NAD population, obtained as a result of the population surveys in remote regions of the Russian Federation Arctic zone. Samples studied were serum and faecal emulsion. The study used the following laboratory methods: for serum — Giardia lamblia antibody screening method using ELISA kit, emulsion stool — native smear microscopy analysis, the method of enrichment using disposable concentrators «Parasep» immunological diagnostic methods based on the detection of specific lamblia antigen in faeces using ELISA kits. For statistics was used descriptive statistics analysis (mean values, the percentage error of the mean, the construction of the trend line) with program SPSS 20.00, Excel 2010, the method of analysis of official statistical reporting hospitals survey on giardiasis, data of Rospotrebnadzor (Russian Sanitary service) for NAD and data from own research from 2002 to 2013. Just in the process of research carried out research on the 10 356 giardiasis, registered diseases by 3470 cases of giardiasis, accounting for 99.14% of the total number of protozoonosises registered and 37.4% of all registered in the NAD parasitosis. The comparison was made among the population of the county towns, home to both the indigenous people, nomadic, and representatives of other ethnic groups, sedentary with urban population of the city of Naryan-Mar. The article analyzes the incidence rates for giardiasis according to district official statistical reporting compared with the incidence in the Russian Federation for the same period of time. Statistical analysis was performed using the software package Excel 2010. The study found an association of giardiasis prevalence in the population of the NAD on criteria such as location, gender, occupation and age structure examined. 

Russian Journal of Infection and Immunity. 2015;5(3):279-284
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OBITUARY

IN MEMORY OF ANATOLIJ B. ZHEBRUN

Abstract

IN MEMORY OF ANATOLIJ B. ZHEBRUN 

Russian Journal of Infection and Immunity. 2015;5(3):285-286
pages 285-286 views

INSTRUCTIONS TO AUTHORS

Abstract

Instructions to Authors
Russian Journal of Infection and Immunity. 2015;5(3):287-289
pages 287-289 views


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