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Application of human monocytic cell line THP-1 for study of pathogenesis in whooping cough agent Bordetella pertussis
Čurnová, Ivana
;
Petráčková, Denisa
(advisor) ;
Mašín, Jiří
(referee)
Bordetella pertussis is strictly human pathogen that causes severe infection of the respiratory tract known as whooping cough, which is currently on the rise. B. pertussis was considered as an extracellular pathogen for a very long time. Recently it was shown the ability of B. pertussis to survive inside early endosomes of macrophages. This ability is studied in the human monocytic cell line THP-1 and also in primary macrophages from human donors. This diploma thesis is focused on THP-1 infectious model and mainly for the early phase of infection. A previously performed transcriptomic study showed significantly affected genes of B. pertussis during intracellular survival in THP-1 macrophages. In this study, we selected genes that are in some way related to intracellular survival inside human macrophages or have significantly effect for intracellular survival. The effect of the mutation in these genes was tested both on the level of cytotoxicity to THP-1 cells and the related number of surviving bacteria inside the macrophages. The deletion strain in two genes for cysteine dioxygenase (BP2871 and BP3011) and the mutant strain allocated in the Bvg+ phase were less cytotoxic than the control strain. Monitoring the effect of opsonization to intracellular survival have not such clear results. The effect...
Detailed record
Interaction of pathogenic Bordetella species with host cells
Čurnová, Ivana
;
Petráčková, Denisa
(advisor) ;
Mašín, Jiří
(referee)
Most of the members of the Gram-negative genus Bordetella cause severe infections of the respiratory tract in their hosts. B. pertussis and specific lineages of B. parapertussis infect humans and cause the disease known as whooping cough, a highly contagious respiratory disease that is currently on the rise even in highly vaccinated populations. Therefore, a more detailed understanding of the B. pertussis interactions with the host is crucial. B. pertussis produces a great variety of virulence factors, majority of which is regulated by the two- component BvgAS system. These factors assist the pathogen in the colonization of the host and evasion of the host immune system. The studies on host-pathogen interactions use both in vitro and in vivo infection models, which complement each other appropriately. Recently, it was demonstrated that B. pertussis escape killing and persists in macrophages, suggesting that B. pertussis can be considered as a facultative intracellular pathogen. This ability may allow the pathogen cells to persist within the host and potentially spread to the new host. The aim of this bachelor thesis was to summarize the knowledge on the host-pathogen interactions between B. pertussis and its host with focus on in vitro and in vivo infection models. The attention is paid especially...
Detailed record
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