National Repository of Grey Literature 24 records found  1 - 10nextend  jump to record: Search took 0.01 seconds. 
Role of microbiota in mouse experimental model of psoriasis
Jirásková Zákostelská, Zuzana ; Stehlíková, Zuzana ; Klimešová, Klára ; Rossmann, Pavel ; Dvořák, Jiří ; Novosádová, Iva ; Kostovčík, Martin ; Coufal, Štěpán ; Šrůtková, Dagmar ; Hudcovic, Tomáš ; Štěpánková, Renata ; Rob, F. ; Jůzlová, P. ; Herzogová, J. ; Tlaskalová-Hogenová, Helena ; Kverka, Miloslav
Anotace v anglickém jazyce\n\nMouse model of human psoriasis and gnotobiotic are important tools in understanding the role of gut and skin microbiota in pathogenesis of psoriasis. In our experiments we showed that gnotobiotic mice, as well as conventional mice treated with antibiotics, have milder skin inflammation in comparison with control conventional mice. Treatment with broad spectrum antibiotics led to dramatic shift in gut microbial composition, in particular, we observed extensive increase of order Lactobacillales. To analyze the potential effect of Lactobacillales on skin inflammation, we further monocolonized mice with L. plantarum WCFS1. Also monocolonized mice showed lower skin inflammation in comparison with conventional mice. To understand whether microbial dysbiosis is cause or effect of psoriasis needs to be further investigated.\n\n
Local steroidogenesis in peripheral tissues and its regulation
Langová, Veronika ; Ergang, Peter (advisor) ; Hudcovic, Tomáš (referee)
The innate and adaptive immune processes are modulated by hormones including glucocorticoids and by microbiota. The exact mechanisms underlying the microbial and hormonal contributions to this control are not completely clear. Present study is therefore focused to crosstalk between microbiota and de novo biogenesis or local regeneration of glucocorticoids. In particular, the study analysed the effect of commensal microbiota on expression of genes encoding steroidogenic enzymes (Star, Cyp11a1, Hsd3b1, Cyp21a1, Cyp11b1) and regeneration of glucocorticoids (Hsd11b1) in adrenal glands, colon, spleen and mesenteric lymph nodes using conventional and germ-free mice. The expression of all 5 components of steroidogenesis was identified only in the adrenal gland and colon, whereas the lymphoid organs expressed predominantly Star, Cyp11a1 and Hsd3b1 indicating the ability to produce only progesterone but not corticosterone. Microbiota decreased the expression of Star in all studied tissues but the expression of other genes was insensitive to microbiota or did not respond homogenously depending on the tissue and gene. Hsd11b1 expression was upregulated by microbiota in the spleen but not in other tissues. Similarly, the in vitro treatment of immune cells isolated from mesenteric lymph nodes by microbial...
The effect of microbiota on pathogenesis of gut diseases
Galanová, Natalie ; Kolařík, Miroslav (advisor) ; Hudcovic, Tomáš (referee)
Gut microbiota is considered an important factor in the development of various diseases including inflammatory bowel disease (IBD, n = 127), Ulcerative colitis, Crohn's disease, and colorectal cancer (CRC, n = 64). A part of this thtesis is to prepare clinical material of different sorts (stool, biopsy) for sequencing on Illumina Miseq platform. This is achieved trough DNA isolation, amplification of 16S and internal transcribed spacer (ITS), normalization and ligation of sequencing adaptors. The aim of this project is to describe the differences between microbiota in healthy and diseased subjects in case of IBD or unimpaired and tumorous tissue for CRC patients. This research is also being based on cultivation, where a fresh stool samples (n = 3) are cultivated in a broad range of conditions, which enables us to obtain ecophysiological and species diversity of these samples by traditional and molecular methods. The cultivable fungi are also assigned reliable taxonomy by amplification of relevant genes (ITS1, β tubulin, second largest subunit of RNA polymerase II, RPB2) followed by both-sided Sanger sequencing. Selected species of fungi are processed into lysates, which are used for stimulation of mice macrofage cell line (RAW). Therefore the impact on immunity response is studied in vitro and...
Human gastrointestinal mycobiome in health and disease
Galanová, Natalie ; Kolařík, Miroslav (advisor) ; Hudcovic, Tomáš (referee)
This Bachelor thesis is a complex review of information about mycobiome of human digestive tract. It summarizes the known incidence, diversity and abundance of fungi in different parts of the gastrointestinal tract together with factors that determine composition of its communities. It also describes plentiful interactions with immune system, other microbes and between fungal species themselves. Then there is a brief remark about methodology that is in use for this subject together with its pros and cons. Thesis sums up and discusses current knowledge about the healthy mycobiome, highlighting cases, when it plays role in the formation of disbalance often resulting in an outbreak of a disease. The paper considers ecology and detailed interactions with the environment for Candida species, the dominant gastrointestinal fungus. Intestinal mycobiota has been lately purposed as an important factor in the development of certain local diseases, which include inflammatory bowel disease, ulcerative colitis and Crohn's disease, or irritable bowel syndrome. Moreover other seemingly unrelated diseases have been associated with a change in intestinal mycobiome in the recent years. Finally intestinal community plays with its immunogenic nature important role in defense mechanisms elsewhere within the body. Key...
Role of bacteria and mucosal immune system and their interaction in the pathogenesis of inflammatory bowel disease
Du, Zhengyu ; Hudcovic, Tomáš (advisor) ; Prokešová, Ludmila (referee) ; Kamanová, Jana (referee)
Although the etiology and pathogenesis of inflammatory bowel disease (IBD) is not fully understood, it is generally accepted that the inflammation results from aberrant immune responses to antigens of gut microbiota in genetically susceptible individuals (Sartor et al., 2006). Alteration in intestinal microbiota has been found in IBD patients with increased abundance of certain bacteria and decreased abundance of others. Due to the complexity of the disease, multifaceted interactions between genetic factors, host immune response, gut microbiota and environment factors need to be taken into account. In this thesis, the pathogenesis of IBD was first reviewed in respect with the four factors mentioned above. Then we concentrated on the interaction between IBD-associated bacteria and mucosal immune system. We investigated the ability of mucosal-associated bacteria (MAB) from IBD patients to induce spontaneous colitis in germ-free (GF) mice and the impact of those bacteria on the development of dextran sulfate sodium (DSS)-colitis. Together with the analysis of the composition of gut microbiota of MAB colonized mice, we demonstrated the potential deleterious microbes were able to increase the susceptibility to DSS-colitis once they found a suitable niche. We revealed the mechanism of an E.coli strain...
Gut microbiome and colorectal cancer
Tlaskalová-Hogenová, Helena ; Klimešová, Klára ; Zákostelská, Zuzana ; Kverka, Miloslav ; Hornová, Michaela ; Vannucci, Luca ; Štěpánková, Renata ; Hudcovic, Tomáš ; Kozáková, Hana ; Rossmann, Pavel
The work deals with metagenomic approaches that are currently being used to decipher the genome of the microbiota (microbiome), and, in parallel, functional studies are being performed to analyze the effects of microbiota on the host.
Study of the effect of probiotic bacteria on the immune development of germ-free mice
Hudcovic, Tomáš
Study of the effect of probiotic bacteria on the immunological profile of originally germ-free mice. The effect of colonization of probiotic bacteria on the development of ulcerative colitis in experimental model was tested.
Vliv komensální mikroflóry na indukci slizniční tolerance k alergenu pylu břízy u BALB/c myší
Kozáková, Hana ; Repa, A. ; Štěpánková, Renata ; Hrnčíř, Tomáš ; Schwarzer, Martin ; Hudcovic, Tomáš ; Tlaskalová, Helena ; Wiedermann, U.
Compared with germ-free mice model, the microflora has no effect on the development of allergic responses or the ability to induce tolerance using a clinical relevant allergen
Vliv rekombinantní bakterie Lactobacillus plantarum na vývoj pylové alergieL
Schwarzer, Martin ; Repa, A. ; Wiedermann, U. ; Hrnčíř, Tomáš ; Daniel, C. ; Pot, B. ; Štěpánková, Renata ; Hudcovic, Tomáš ; Tlaskalová, Helena ; Součková, Martina ; Kozáková, Hana
Germfree mice were monocolonized with recombinant Lactobacillus plantarum producing Bet v 1. Subsequently mice were sensitized by intraperitoneal injections to Bet v 1. We found out that monocolonization with recombinant L. plantarum reduced the level of specific Bet v 1 specific IgE antibody and stimulated production of INF-gamma in spleen cells supernatants. We conclude that monocolonization by recombinant L. plantarum shifts the immune response towards Th-1 direction and that it is a promising vaccine candidate against type I allergy
Escherichia coli O83:K24:H31 – potenciální živý nosič pro mukozální vakcíny
Šimšová, Marcela ; Schwarzer, Martin ; Hrnčíř, Tomáš ; Hudcovic, Tomáš ; Kozáková, Hana ; Šebo, Peter
The aim of our study was to create a mucosal vaccine for impoverished population. We used Escherichia coli O83:K24:H31 as live vector. It produced fused antigen M. tuberculosis fused antigens Ag85B-Esat6 (H1) which was inserted into a surface-exposed loop of the outer membrane protein LamB. Mice were given the bacteria according to the immunization protocol, they received free soluble H1 antigen with the mucosal adjuvant LTK63 as intranasal boost. We observed increase of total IgA on the intestine mucosa after colonization of E. coli O83 and induction of specific anti-H1 IgA level in small intestine

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