130 research outputs found
Effect of prolonged hypokinesia on resistance of resistive vessels in rats
Under the effect of prolonged hypokinesia, the perfusion pressure in resistive vessels, measured under conditions of deep anesthesia and complete denervation, increased by approximately the same degree as arterial pressure in non-anesthetized animals. The increase in arterial, perfusion pressure and the resistance of resistive vessels in animals subjected to prolonged hypokinesia was accompanied by an increase in adrenoreactivity. During prolonged hypokinesia, partial obliteration of the vascular bed of the skeletal muscles plays a significant role in the observed increase in resistance of vessels of the extremities. The increase in adrenoreactivity of the vessels during hypokinesia may be realized as a partial case of an increase in the adrenoreactivity of structures whose innervation is disturbed
Biliary Microbiota, Gallstone Disease and Infection with Opisthorchis felineus.
BACKGROUND: There is increasing interest in the microbiome of the hepatobiliary system. This study investigated the influence of infection with the fish-borne liver fluke, Opisthorchis felineus on the biliary microbiome of residents of the Tomsk region of western Siberia.
METHODOLOGY/PRINCIPAL FINDINGS: Samples of bile were provided by 56 study participants, half of who were infected with O. felineus, and all of who were diagnosed with gallstone disease. The microbiota of the bile was investigated using high throughput, Illumina-based sequencing targeting the prokaryotic 16S rRNA gene. About 2,797, discrete phylotypes of prokaryotes were detected. At the level of phylum, bile from participants with opisthorchiasis showed greater numbers of Synergistetes, Spirochaetes, Planctomycetes, TM7 and Verrucomicrobia. Numbers of \u3e 20 phylotypes differed in bile of the O. felineus-infected compared to non-infected participants, including presence of species of the genera Mycoplana, Cellulosimicrobium, Microlunatus and Phycicoccus, and the Archaeans genus, Halogeometricum, and increased numbers of Selenomonas, Bacteroides, Rothia, Leptotrichia, Lactobacillus, Treponema and Klebsiella.
CONCLUSIONS/SIGNIFICANCE: Overall, infection with the liver fluke O. felineus modified the biliary microbiome, increasing abundance of bacterial and archaeal phylotypes
Genetic methods in honey bee breeding
The honey bee Apis mellifera is a rather difficult object for selection due to the peculiarities of its biology. Breeding activities in beekeeping are aimed at obtaining bee colonies with high rates of economically useful traits, such as productivity, resistance to low temperatures and diseases, hygienic behavior, oviposition of the queen, etc. With two apiaries specializing in the breeding of A. m. mellifera and A. m. carnica as examples, the application of genetic methods in the selection of honey bees is considered. The first stage of the work was subspecies identification based on the analysis of the polymorphism of the intergenic mtDNA locus tRNAleu-COII (or COI-COII) and microsatellite nuclear DNA loci Ap243, 4a110, A24, A8, A43, A113, A88, Ap049, A28. This analysis confirmed that the studied colonies correspond to the declared subspecies. In the apiary with A. m. mellifera, hybrid colonies have been identified. A method based on the analysis of polymorphisms of the tRNAleu-COII locus and microsatellite nuclear DNA loci has been developed to identify the dark forest bee A. m. mellifera and does not allow one to differentiate subspecies from C (A. m. carnica and A. m. ligustica) and O (A. m. caucasica) evolutionary lineages from each other. The second stage was the assessment of the allelic diversity of the csd gene. In the apiary containing colonies of A. m. mellifera (N = 15), 20 csd alleles were identified. In the apiary containing colonies of A. m. carnica (N = 44), 41 alleles were identified. Six alleles are shared by both apiaries. DNA diagnostics of bee diseases showed that the studied colonies are healthy. Based on the data obtained, a scheme was developed for obtaining primary material for honey bee breeding, which can subsequently be subjected to selection according to economically useful traits. In addition, the annual assessment of the allelic diversity of the csd gene will shed light on the frequency of formation of new allelic variants and other issues related to the evolution of this gene
Genetic markers for the resistance of honey bee to Varroa destructor
In the mid-20th century, the first case of infection of European bees Apis mellifera L. with the ectoparasite mite Varroa destructor was recorded. The original host of this mite is the Asian bee Apis cerana. The mite V. destructor was widespread throughout Europe, North and South America, and Australia remained the only continent free from this parasite. Without acaricide treatment any honeybee colony dies within 1–4 years. The use of synthetic acaricides has not justified itself – they make beekeeping products unsuitable and mites develop resistance to them, which forces the use of even greater concentrations that can be toxic to the bees. Therefore, the only safe measure to combat the mite is the use of biological control methods. One of these methods is the selection of bee colonies with natural mite resistance. In this article we summarize publications devoted to the search for genetic markers associated with resistance to V. destructor. The first part discusses the basic mechanisms of bee resistance (Varroa sensitive hygienic behavior and grooming) and methods for their assessment. The second part focuses on research aimed at searching for loci and candidate genes associated with resistance to varroosis by mapping quantitative traits loci and genome-wide association studies. The third part summarizes studies of the transcriptome profile of Varroa resistant bees. The last part discusses the most likely candidate genes – potential markers for breeding Varroa resistant bees. Resistance to the mite is manifested in a variety of phenotypes and is under polygenic control. The establishing of gene pathways involved in resistance to Varroa will help create a methodological basis for the selection of Varroa resistant honeybee colonies
ЦЕЛЕСООБРАЗНОСТЬ И ПЕРСПЕКТИВЫ ВАКЦИНОПРОФИЛАКТИКИ КОКЛЮША БЕЗ ВОЗРАСТНЫХ ОГРАНИЧЕНИЙ
The goal of study was the epidemiological substantiation of optimization measures of a vaccinal prevention of whooping cough in the Russian Federation. Materials and methods. The retrospective descriptive epidemiological research has been conducted by analysis of the official statistical data on the whooping cough case rate (form No. 2) in 2005–2017 in the Russian Federation, as well as the data about preventive whooping cough inoculations (forms No. 5, No. 6) in 2005–2017 and about epidemic outbreakes in 2017 (form No. 23-17). The assessment of an economic damage from whooping cough in 2005-2017 has been carried out. Results. The following adverse characteristics of a modern epidemiological situation on whooping cough in Russia are shown: long-term recurrence of epidemic process, tendency of rising of a case rate of children of 0-2 years; high percentage of children of preschool and school age among whooping cough cases; prevalence among the patients with whooping cough of the children who have been vaccinated against this infection previously, epidemic outbreakes in children’s collectives, the stability of a case rate of teenagers and adults with prevalence of the mild and the erased clinical forms of this infection. The risks due to weaknesses of the whooping cough vaccinal prevention are noted: the insufficient immunization coverage owing to falce contraindications and refusals of parents of vaccinations of children, noncompliance with terms and intervals between inoculations, lack of domestic vaccine for revaccination of children at the age of 5 years and older. Conclusion. It is necessary to introduce in the national vaccination schedule a preschool booster dose for children at the age of 6 and adolescents at 14 years with the combined reduced antigen content tetanus–diphtheria and acellular pertussis vaccines as well as the inoculations of this vaccine according to epidemiological indications to health workers, employees of educational institutions. A revaccination against whooping cough is recommended as “cocoon” for the persons contacting to not vaccinated child under 1 year of age.Цель: эпидемиологическое обоснование мер по оптимизации вакцинопрофилактики коклюша в Российской Федерации. Материалы и методы. Проведено ретроспективное описательное исследование. Изучены официальные статистические данные о заболеваемости коклюшем в Российской Федерации (форма № 2) за 2005–2017 гг., о профилактических прививках против коклюша (формы № 5, № 6) за 2005–2017 гг., об эпидемических вспышках за 2017 г. (форма № 23-17). Проведена оценка экономического ущерба от коклюша за 2005–2017 гг. Результаты: показаны неблагоприятные характеристики современной эпидемиологической ситуации по коклюшу в России: сохранение многолетней цикличности эпидемического процесса, тенденция роста заболеваемости детей 0–2 лет; высокий удельный вес среди заболевших детей дошкольного и школьного возраста; преобладание среди заболевших коклюшем детей, ранее привитых против этой инфекции, эпидемические вспышки в детских коллективах, стабильность заболеваемости подростков и взрослых с преобладанием легких и стертых клинических форм инфекции. Отмечены риски, связанные с недостатками вакцинопрофилактики: недостаточный охват прививками вследствие необоснованных медицинских отводов и отказов родителей от вакцинации детей, несоблюдение сроков и интервалов между прививками, отсутствие отечественной вакцины для проведения ревакцинации детям в возрасте 5 лет и старше. Заключение: необходимо внедрить в национальный календарь профилактических прививок ревакцинации детей в возрасте 6 и 14 лет комбинированной вакциной против дифтерии и столбняка (со сниженным содержанием анатоксинов) с бесклеточным коклюшным компонентом, а также включить в национальный календарь прививок по эпидемиологическим показаниям прививки данной вакцины медицинским работникам, работникам образовательных учреждений. Проводить ревакцинацию против коклюша по типу «кокона» лиц, контактирующих с непривитым ребенком в возрасте до 1 года
Hemozoin "knobs" in Opisthorchis felineus infected liver
Background Hemozoin is the pigment produced by some blood-feeding parasites. It demonstrates high diagnostic and therapeutic potential. In this work the formation of co-called hemozoin “knobs” – the bile duct ectasia filled up by hemozoin pigment - in Opisthorhis felineus infected hamster liver has been observed. Methods The O. felineus infected liver was examined by histological analysis and magnetic resonance imaging (MRI). The pigment hemozoin was identified by Fourier transform infrared spectroscopy and high resolution electrospray ionization mass spectrometry analysis. Hemozoin crystals were characterised by high resolution transmission electron microscopy. Results Hemozoin crystals produced by O. felineus have average length 403 nm and the length-to-width ratio equals 2.0. The regurgitation of hemozoin from parasitic fluke during infection leads to formation of bile duct ectasia. The active release of hemozoin from O. felineus during in vitro incubation has also been evidenced. It has been shown that the hemozoin knobs can be detected by magnetic resonance imaging. Conclusions In the paper for the first time the characterisation of hemozoin pigment extracted from liver fluke O. felineus has been conducted. The role of hemozoin in the modification of immune response by opisthorchiasis is assumed
The impact of Opisthorchis felineus infection and praziquantel treatment on the intestinal microbiota in children
peer reviewedThe presence of some species of helminths is associated with changes in host microbiota composition and diversity, which varies widely depending on the infecting helminth species and other factors. We conducted a prospective case-control study to evaluate the gut microbiota in children with Opisthorchis felineus infection (n=50) before and after anthelmintic treatment and in uninfected children (n=49) in the endemic region. A total of 99 children and adolescents aged between 7 and 18 years were enrolled to the study. Helminth infection was assessed before and at 3 months after treatment with praziquantel. A complex examination for each participant was performed in the study, including an assessment of the clinical symptoms and an intestinal microbiota survey by 16S rRNA gene sequencing of stool samples. There was no change in alpha diversity between O. felineus-infected and control groups. We found significant changes in the abundances of bacterial taxa at different taxonomic levels between the infected and uninfected individuals. Enterobacteriaceae family was more abundant in infected participants compared to uninfected children. On the genus level, O. felineus-infected participants’ microbiota showed higher levels of Lachnospira, Escherichia-Shigella, Bacteroides, Eubacterium eligens group, Ruminiclostridium 6, Barnesiella, Oscillibacter, Faecalitalea and Anaerosporobacter and reduction of Blautia, Lachnospiraceae FCS020 and Eubacterium hallii group in comparison with the uninfected individuals. Following praziquantel therapy, there were significant differences in abundances of some microorganisms, including an increase of Faecalibacterium and decrease of Megasphaera, Roseburia. Enterobacteriaceae and Escherichia abundances were decreased up to the control group values. Our results highlight the importance of the host-parasite-microbiota interactions for the community health in the endemic regions. © 202
МОЛЕКУЛЯРНЫЕ МЕХАНИЗМЫ, ОПОСРЕДУЮЩИЕ РАЗВИТИЕ ХОЛАНГИОКАРЦИНОМЫ В ХОДЕ ХРОНИЧЕСКОЙ ИНВАЗИИ ПЕЧЕНОЧНЫМИ СОСАЛЬЩИКАМИ
Cholangiocarcinoma is a malignant tumor, characterized by poor prognosis and a low five-year survival rate. There is a clear correlation between the incidence of opisthorchiasis and high incidence of cholangiocarcinoma in South-East Asia. Liver flukes Clonorchis sinensis and Opisthorchis viverrini are I class carcinogens. There are some endemic regions of opisthorchiasis In the Russian Federation. The most important factor that leads to carcinogenesis during liver fluke infection is chronic inflammation. This review article focuses on the communication of chronic inflammation caused by invasion of liver flukes and cholangiocarcinoma. This paper summarizes the current knowledge about the risk factors for cholangiocarcinoma, as well as knowledge about the molecular aspects of the induction of carcinogenesis by liver flukes.Холангиокарцинома характеризуется неблагоприятным прогнозом и низкой пятилетней выживаемостью. Прослеживается связь между заболеваемостью описторхозом и высокой частотой возникновения холангиокарциномы в странах Юго-Восточной Азии. Печеночные сосальщики Clonorchis Sinensis и Opisthorchis viverrini являются канцерогенами I класса. Известно, что в Российской Федерации также существует несколько эндемических очагов заболеваемости описторхозом. Важнейшим фактором, который обусловливает канцерогенез при описторхозной инвазии, является хроническое воспаление. В обзорной статье основное внимание уделено связи хронического воспаления, вызванного инвазией печеночных сосальщиков, и холангиокарциномы. Обобщены имеющиеся знания о факторах риска развития холангиокарциномы, а также данные о молекулярных аспектах индукции канцерогенеза печеночными сосальщиками
Cytokine profile and expression of FYN, ZAP-70 and LAT during concanavalin a stimulation in patients with resistant bronchial asthma
Background: Bronchial asthma (BA) is one of the most spreading chronic lung pathology in the world. The disease is characterized by high heterogeneity of clinical phenotypes including resistant forms which provoke significant clinical problem. Immune shift from Th2 to alternative immunological response is considered to be a mechanism of drug-resistance in BA treatment but this issue is not considerably studied yet. Aims: Detection of distinctive patterns in cytokine secretion and genetic expression (ZAP-70, FYN and LAT) of naïve and concanavalin A stimulated lymphocytes in patients with resistant BA. Materials and methods: The study enrolled ten patients in each group: subjects with treatment resistant BA, severe BA, and controls (30 in total). During the experiment, all patients with BA received treatment according to the condition. For each participant lymphocytes isolation from venous blood was performed. Cells were cultured with concanavalin A and without stimulation. Concentrations of cytokines IL-2, IL-12, TNF-α, IL-4, IL-5, and IL-6 in supernatants were measured with ELISA. Reverse transcription polymerase chain reaction was used to detect the mRNA expression of LAT, ZAP-70, and FYN genes. Results: Significant disease contribution to the lymphocyte secretion profile was established without concanavalin A stimulation: increased levels of IL-2 and IL-4 was observed in lymphocytes of patients with resistant BA if compared to the results of gorup with severe BA. Patients with resistant BA were characterized by weak cytokine response to the stimulation: only TNF-α and IL-5 levels were significantly increased whereas in group with severe BA all cytokines concentrations increased except IL-12, in controls - except IL-12 and IL-2. Significant FYN upregulation was identified in resistant BA group if compared with other groups, and in severe BA patients if compared with controls. The concanavalin A-stimulated cells showed increased expression of ZAP-70 in cells of patients with resistant BA compared to control group. Conclusions: Lymphocytes from patients with resistant BA are characterized by lack of cytokine response to concanavalin A stimulation, alteration of cytokine secretion, and genetic expression profile similar to cells with low sensitivity to apoptosis. The FYN gene is a perspective target for finding approaches to overcome resistance to steroid drugs in bronchial asthma. © 2018 Izdatel'stvo Meditsina. All rights reserved
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