Synthesis in a gel and sorption properties of N-2-sulfoethyl chitosan

A new procedure was developed for preparation of chelate amino-containing polymer N-2-sulfoethyl chitosan by synthesis in a gel through the reaction between chitosan and sodium 2-bromoethanesulfonate, yielding a polymer with the degree of substitution of up to 0.5. The structure of the resulting polymers was confirmed by 1H NMR spectroscopy. The sorption characteristics with respect to transition and alkaline-earth metal ions were determined for the cross-linked polymers. © 2013 Pleiades Publishing, Ltd

Detection of some genes encoding pathogenicity factors in the typical isolates of Escherichia coli

Using polymerase chain reaction 316 strains of E. coli (strains with normal enzymatic activity, strains with weak enzymatic activity and strains with hemolytic activity) were examined for the presence of pathogenicity genes. They were isolatedfrom healthy children and children with functional disorders of the gastro-intestinal tract. The studies have shown that strains of Escherichia coli have pathogenic potential, as evidenced by the presence of genetic pathogenicity markers in them

REGIONAL FEATURES OF BIFIDOBACTERIA ANTAGONISTIC ACTIVITY IN INTESTINAL MICROBIOTA OF CHILDREN LIVING IN SIBERIA

Antagonistic properties of bifidobacteria to opportunistic microorganisms in vitro and mechanism of antagonistic activity decreasing were studied and. analyzed. Great percentage of bifidobacteria regional population strains with low antagonistic activity to transitional opportunistic microorganisms is registered. It results to colonization. resistance decreasing and. requires development of the preventive probiotics therapy methods to correct

MICROECOLOGICAL CHARACTERISTICS OF KLEBSIELLA SPP. REGIONAL POPULATIONS IN THE INTESTINAL MICROBIOTA OF IRKUTSK CHILDREN

In this paper the microecological characteristics of Klebsiella spp. regional populations in the intestinal microbiota of infants were represented. 373 children (55,9 % of general quantity of researched) had disbiotic changes of intestinal microbiota related to increasing number of Klebsiella. The autostrains sensitivity to antibiotic drugs (в-lactams, aminoglycosides, quinolones) and to purified Klebsiella pneumoniae phage and purified polyvalent Klebsiella phage were researched. Samples of isolates (n = 142) characterized by a high proportion of antibiotic susceptible strains. Phage sensitivity of bacteriophage to the commercial preparations was determined in 268 strains of Klebsiella spp. of two types (146 strains of K. Oxytoca and 122 strains of K. pneumonia). Probably high frequency of pathogens resistant to studied bacteriophages (K. oxytocain 66 % and K. pneumoniae in 77.8 % of cases) was the reason of low efficiency of phage therapy by specific phage and can explain high frequency of occurrence of Klebsiella at dysbiosis in children of early age

Species substrate specificity of growth of lactobacilli isolated from vaginal biotope on culture medium with inclusions of different types of natural nanopolysaccharides

The article presents the research of substrate and prebiotic properties of natural nanopolysaccharides for several species of lactobacilli isolated from vaginal biotope of women, with assessment of their species combinations. Most of typeable lactobacilli species prefer to grow on media containing polysaccharides, mainly in nutrient broth supplemented with galactomannan and carageenan. Using galactomannan increases the frequency of detection, as compared with the isolation from the starting material, twice

Detection of genetic markers of pathogenicity factors at associative symbiosis of Klebsiella spp. and Staphylococcus aureus autostrains, isolated from infants

The article presents the results of detection of genetic determinants of pathogenicity in 120 Klebsiella strains (Klebsiella pneumoniae, Klebsiella oxytoca) and 48 Staphylococcus aureus strains isolated from the intestinal habitat of infants with intestinal dysbiosis. Registration of the investigated determinants in Klebsiella spp. autostrains DNA, which are non-clinical isolates, indicates the circulation of pathogenicity factors and, consequently, their possible causation in the formation of intestinal dysbiosis in infants

DETECTION OF CERTAIN GENETIC MARKERS OF THE PATHOGENIC FACTORS IN AUTOSTRAINS KLEBSIELLA SPP. IN INFANTS

The article presents the results of detection of genetic determinants of pathogenicity in 44 strains of Klebsiella (Klebsiella pneumoniae, Klebsiella oxytoca), isolated from the intestinal habitat of infants with intestinal dysbiosis. The presence of the uge gene was detected in 92 % of cases in K. oxytoca and in 90 % of K. pneumoniae. Kfu gene was detected twice as frequent (30 %) in K. pneumoniae strains than in K. oxytoca (12,5 %); bfp gene was detected in K. oxytoca 5 times more frequently (25 %) than in K. pneumoniae (5 %), as well as stx 1 - 29,2 % and 15 %, correspondingly. The presence of stx 2 gene wasn't recorded in any of the DNA samples. Registration of investigated determinants in DNA of Klebsiella spp. autostrains which are non-clinical isolates indicates pathogenicity factors circulation among them and therefore the risk of the formation of intestinal dysbiosis in children

MICROECOLOGICAL AND GENESPECIFIC CHARACTERISTICS OF VAGINAL BIOTOPE LACTOBACILLI IN WOMEN WITH NONSPECIFIC LOWER FEMALE REPRODUCTIVE TRACT INFLAMMATORY DISEASES

The study included 30 reproductive age women with lower female reproductive tract nonspecific inflammatory diseases. The analysis of the qualitative and quantitative pathogenic microorganisms as well as lactobacilli composition was conducted. It was shown that in women observed the opportunistic microflora detected often (73,3 %) in the rest part of patients (26,7 %) in case if opportunistic microflora was absent the disbiotic changes occurred in lower concentration of normal microflora of vagina represented mostly by lactoflora. Deficiency of lactobacilli was observed almost in all women of this group (96,6 %) and only in one case (3,4 %) the concentration of lactobacilli was consistent with normal physiological range. Molecular genetic methods (PCR amplification) with visualization by means of electrophoresis in agarose gel was made for identification of Lactobacilli species. Consistency index (c) and species saturation index (sri) for opportunistic microorganisms in women vaginal biotope examined were calculated. Prevalence of Lactobacillus plantarum and Lactobacillus jensoni isolating in 83 and 50 % respectively was shown. Also it was shown that in the structure of quantitative compatibility of studied species of lactobacilli the highest rate is characterized to the association of two types that makes 53 %

Использование функциональных тестов для оценки остаточной активности канала CFTR и индивидуального подбора эффективных CFTR-модуляторов для лечения пациентов с муковисцидозом с «мягким» и «тяжелым» генетическими вариантами

Intestinal current measurement (ICM) and forskolin-induced swelling (FIS) assay in human intestinal organoids from rectal biopsies of cystic fibrosis (CF) patients are the new functional tests for assessment of CFTR channel activity that are widely used in the leading laboratories worldwide for scientific and clinical studies.The aim of the study was to assess the use of the new functional tests in adult CF patients with identified N1303K and R334W CFTR gene variants.Methods. Rectal suction biopsies were obtained from the two CF patients aged 36 and 27 years with N1303K/3821delT and R334W/F508del CFTR mutations, respectively. Results of the ICM and FIS assay in intestinal organoids were compared to the clinical data.Results. ICM has demonstrated that R334W is a ‘mild’ genetic variant with high residual CFTR channel activity. At the same time, N1303K is a ‘severe’ genetic variant and leads to a severe loss of CFTR channel function. These findings correlate with the clinical data. CFTR modulators compensate for the reduced activity of the R334W CFTR variant, as shown by the FIS assay. But there was a limited response of the forskolin-stimulated organoids to VX-770 potentiator and VX-809 corrector in the cells with N1303K genetic variant.Conclusion. ICM and FIS assay in human intestinal organoids are reliable methods for quantification of CFTR channel activity. They can also predict the efficacy of the targeted therapy in CF patients in vivo.Новые функциональные методы исследования активности канала CFTR – определение разности кишечных потенциалов (ОРКП) и форсколиновый тест на кишечных органоидах, получаемых из ректальных биоптатов больных муковисцидозом (МВ), приняты в ведущих лабораториях мира для научной и клинической работы.Целью исследования явилась оценка возможности применения новейших функциональных методик у взрослых больных МВ – носителей генетических вариантов гена CFTR – N1303K и R334W.Материалы и методы. Получены ректальные биоптаты у пациенток с МВ (n = 2) в возрасте 36 и 27 лет с генотипом CFTR R334W/F508del и N1303K/3821delT соответственно. Проведены ОРКП и форсколиновый тест на кишечных органоидах; полученные результаты сопоставлены с клиническими данными.Результаты. По результатам ОРКП подтверждено, что генетический вариант R334W является «мягким», с сохранением высокой остаточной функциональной активности канала CFTR, тогда как генетический вариант N1303K является «тяжелым» и приводит к утрате рабочего белка CFTR, что соответствует представленной клинической картине. Результаты форсколинового теста свидетельствуют о том, что вариант R334W хорошо поддается коррекции CFTR-модуляторами. Потенциатор VX-770 и корректор VX-809 оказывают слабое действие на стимуляцию форсколином органоидов при генетическом варианте N1303K.Заключение. Использование метода ОРКП и форсколинового теста на кишечных органоидах позволяет количественно оценить работу белка CFTR и in vitro определить эффективность таргетной терапии у пациентов с МВ