National Repository of Grey Literature 5 records found  Search took 0.01 seconds. 
The effect of antibiotics on human gut microbiome and the influence of probiotics on its restoration
Hloucalová, Nikola ; Lichá, Irena (advisor) ; Ulrych, Aleš (referee)
Antibiotics are used for treatment of bacterial infections. They negatively affect not only the pathogens, but also other microorganisms in the gut, including the beneficial bacteria. Antibiotic treatment changes the proportion of good versus bad bacteria in the gut, causes a decrease in the number of commensal bacteria and leads to the overgrowth of opportunistic pathogens. We should consume probiotics during and after the antibiotic treatment, otherwise it results in an unhealthy stool and moreover it affects the immune system which then leads to physical and mental illnesses. This thesis summarizes the influence of probiotics on human gut during dysbiosis caused mainly by antibiotics.
Effect of intestinal microflora on the activity of higher brain centers
Arnold, Tomáš ; Hock, Miroslav (advisor) ; Melkes, Barbora (referee)
Abstract Intestinal microflora consists of large bacterial community that resides in the intestines, especially the colon, and lives in symbiosis with the host. It consists mainly representatives of the four bacterial strains (Actinobacteria, Bacteroidetes, Firmicutes and Proteobacteria). It has already been shown that the proportional representation of the bacterial strains in time does not change much, but the research of the last decade have shown irrefutable effect between the change of diet and composition of the intestinal microflora. In addition, there is evidence of changes in the representation of bacterial strains in the course of development of certain intestinal pathologies such as inflammatory bowel disease. More and more are starting to emerge papers describing the influence of altered intestinal microflora respectively its representatives, on the activity and function of the CNS. This interaction of the digestive system and CNS seems to be bidirectional and mediated by several different pathways. Finally, it shows that dysbiosis of the intestinal microflora promotes anxiety and depression that can lead to the urge to prematurely terminate life. The aim of this work is to provide a comprehensive view of this relatively young, but also very interesting...
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...

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