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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
NK cell involvement in the pathogenesis of autoimmune arthritis
 Richter, Jan ; Fišerová, Anna (advisor) ; Hromadníková, Ilona (referee) ; Turánek, Jaroslav (referee)
Rheumatoid arthritis (RA) is a worldwide problem representing one of the most prevalent autoimmune diseases in the world. Despite the commonness of the disea- se, its pathogenesis has not been fully described. Immune cells ranging from antigen- presenting cells to T, B and NK cells playing various roles participate in the rheumatic process. In this work we concentrated on NK cells expressing a repertoire of activating and inhibitory receptors which influence their function in health and disease. We focused on the analysis of NK cell function and described its possible modulation by rheumatic autoantigens and multivalent glycodendrimers bearing 4 (GN4C) or 8 (GN8P) N-acetyl glucosamine moieties. The effect on NK cells and the glycosylation pathways was further studied in vitro. Finally, an in vivo study was performed on an animal model of RA - col- lagen-induced arthritis (CIA) to assess the effect of the compounds on clinical develop- ment of the disease and selected immune parameters. Comparison of NK cell cytotoxicity in patients suffering from RA, other inflam- matory diseases and healthy donors showed its impairment particularly in RA patients. Peripheral blood NK cells reacted to GN8P glycoconjugate by inhibition of their effector function in CD161 high-expressing samples. The MGAT5...
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Human polyomavirus isolated from Merkel cell carcinoma
 Vochozková, Petra ; Šroller, Vojtěch (advisor) ; Španielová, Hana (referee)
Human polyomaviruses belong to the Polyomaviridae family. Until now, five human polyomaviruses (BK, JC, KI, WU and MCV) have been discovered. There is described the course of polyomavirus infection in the first part of the thesis. These small nonenveloped viruses penetrate into the host cell by receptor-mediated endocytosis and then travel through the ER pathway to get into the nucleus where the virus replicates and expresses viral proteins. The infection occurs during early childhood and the virus remains asymptomatic in healthy individuals. However, the virus is able to reactivate in the immunosuppressed patients and can cause some diseases. The second part of thesis is focused on the MCV. MCV genom was detected in Merkel cell carcinoma (MCC) two years ago. MCV infects the Merkel cells and its DNA integrates into host cell genome. In most cases, the MCV is detected in cancer cells using PCR. Viral sequences encoding the large and small T antigen were found in the MCC using the same method; moreover, there was expressed a significant amount of oncoproteins. These factors point out an important role of MCV in the tumor progress. The study of MCV may help to discover new approaches for the treatment of MCC and other biologically similar tumors.
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