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Study of the mechanism of anticancer drug action on neuroblastomas
Černá, Tereza
;
Stiborová, Marie
(advisor) ;
Souček, Pavel
(referee) ;
Mrízová, Iveta
(referee)
Despite advances in cancer diagnosis and therapy, cancer is the second leading cause of death globally. The improvements of cancer treatment are the major challenge in this research. The aim of the thesis was studying of effects of two anticancer drugs ellipticine (Elli) and doxorubicin (DOX) on some cancer and healthy cell lines. Specific consideration was given to expand current knowledge about the metabolism and cytostatic effects of Elli in neuroblastoma cell lines. Another part of this study was focused on mechanisms contributing to the development of ellipticine-resistance in cancer cells and influence of histone deacetylase inhibitors on anticancer therapy was investigated. Moreover, the aim was to develop apoferritin (Apo) nanocarrier suitable for the active transport of cytostatics to cancer cells. Several essential data were found in this doctoral thesis. Anticancer efficiency of Elli depends on the CYP3A4-mediated metabolism in cancer. The CYP3A4 enzyme encapsulated into two nanoparticle forms, liposomes and SupersomesTM , was tested to activate ellipticine to its reactive species forming covalent DNA adducts. The formation of adducts seems to be dependent on concentrations of CYP3A4 in nanoparticle systems. A higher effectiveness of CYP3A4 in SupersomesTM than in liposomes to form...
Detailed record
Histone deacetylase inhibitors induced caspase-independent cell death
Groh, Tomáš
;
Poljaková, Jitka
(advisor) ;
Eckschlager, Tomáš
(referee)
Neuroblastoma is the most common extracranial solid tumor that occurs during infancy. Despite the great progress has been made in contemporary clinic medicine some forms of neuroblastoma disease are still found very difficult to treat . This work focuses on the effects of histone deacetylase inhibitors (HDAC) in the neuroblastoma cell lines. It is known that HDAC inhibitors may contribute to recurrence of the tumor cells by affecting the chromatin structure and thus increase the expression of critical tumor suppressor genes. These genes activate apoptotic pathways that may even be independent of caspases. We observed the efficiency of used HDAC inhibitors as under standard conditions an in hypoxia (1 % O2). Inadequate amount of oxygen supply is one of the characteristic features of tumors and it also may contribute to chemoresistance. With the hypoxia-induced chemoresistance of tumor cells, the influence of HIF-1α is expected. Some HDAC inhibitors reduce the amount of HIF-1α in hypoxia and thus HIF transcription factor activity. Thus, the first part of this study is concerned with the acquisition of suitable experimental arrangement for the monitoring of induction of cellular death in human neuroblastoma cell lines SK-N-AS and UKF-NB-3. Secondly, this paper provides the evaluation of the influence...
Detailed record
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