|
|
Gonadal development during the lifetime of the fastest maturing model vertebrate- turquoise killifish (Nothobrachius furzerí)
LANDOVÁ, Magdaléna
Turquoise killifish had to adapt to the inhospitable conditions in which they live, especially drying temporal water bodies, which means certain death. The life sprint of the representatives of this genus is at its peak within one-month post-hatching, when both sexes have fully developed gonads and can reproduce. This rate comes with a high cost, as the killifish gonads begin to show signs of tissue degradation and germ cell apoptosis as early as three months post-hatching. Germ cell loss increases with age. A description of the development and degradation of the gonads in males and their breeding was elaborated. For the evaluation of aging-specific changes, immunochemical methods were used, focusing on the binding of specific antibodies against target epitopes and their visualization using fluorescence microscopy. Procedures for histological specimens have also been described, both for classical light and fluorescence microscopy.
|
|
|
Kombinace nádorové imunoterapie s blokací inhibitorů apoptózy
HAVLOVÁ, Aneta
The aim of this thesis was to study the possibility of combination of cancer immunotherapy with blockade of inhibitors of apoptosis. I described structure, functions, and the effect of these inhibitors on cancer development. Special attention was paid to the ways which can be used to block inhibitors of apoptosis. Finally I suggested the combination of blockade of these inhibitors with MBTA immunotherapy.
|
|
|
Spontánní regrese rakoviny
RADOVÁ, Lenka
The main goal of this thesis is to find and gather documented cases of spontaneous cancer regression without targeted therapy. Based on the case studies, this thesis aims to categorize individual cases and explain spontaneous regression at the immunological level. According to the findings, we will attempt to evaluate whether the observed cases of cancer regression would find experimental or clinical use.
|
|
|
Characterization and modulation of MitoTam-induced cell death in breast carcinoma cells
Hrysiuk, Mariia ; Anděra, Ladislav (advisor) ; Dráber, Peter (referee)
Although recent years brought many breakthrough discoveries in anti-cancer research and therapy, malignant diseases such as breast cancer (BC) still present one of the major health threats worldwide. Cancer cells usually gain resistance to the activation of regulated cell death (RCD) modalities such as caspase-dependent apoptosis. Among novel RCD-inducing agents belongs to mitochondria-targeted tamoxifen - MitoTam, which is also the major focus of this Thesis. In a panel of BC cells, we determined the energetic (mitochondrial respiration vs. glycolysis) and major RCD-related proteins (Western blotting) profiles, and using Lumascope LS720-assisted time-lapse monitoring we analyzed their sensitivity to MitoTam-induced RCD. We found out that glycolysis-preferring BC cells as MDA-MB-231 are more resistant to MitoTam treatment than mitochondrial respiration-biased MDA-MB-453 cells. However,the majority of tested BC cells can be sensitized to MitoTam by BH3 mimetics such as BCL-XL targeting A1155463 and some cellular metabolism-modulating compounds such as lactate dehydrogenase inhibitor (R)-GNE-140, especially in the pre-treatment regime. Also, other metabolism-modulating compounds such as Pyruvate Dehydrogenase Kinases inhibitor JX06 potently enhanced the efficacy and kinetics of MitoTam-induced RCD....
|
|
|
The role of caspase-3 in apoptosis
Kolářová, Karolína ; Tlapáková, Tereza (advisor) ; Anděra, Ladislav (referee)
Caspases provide anti-inflammatory, apoptotic and developmental processes in organisms. They are enzymes with a wide range of activities in all cells, and various pathogeneses can occur if their proper function is disturbed. Since the 1990s, caspases have been a topic of interest for scientists, as their direct link to the triggering of apoptotic processes is a promising possibility for the therapy of diseases related to apoptosis, such as cancer, neurodegenerative diseases, but also cardiac ischemia and diabetes. The cascade of apoptotic processes is controlled by the aforementioned caspases, which are located in the caspase cascade. When the cascade is triggered in a cell, it is due to the presence of a "danger" signal, which can be very different. The most well-known triggers of the apoptotic cascade include activated Fas receptor and FasL ligand, cytochrome c present in the cytoplasm, an imbalance of IAPs in the cell, damaged DNA, and many others. Upon receipt of a signal, initiator caspase-2, caspase-8, and caspase-9 are activated, which in turn activate effector caspases-3, caspase-6, and caspase- 7, cleaving many substrates to promote apoptosis. Thus, caspase-3 is the effector enzyme responsible for the actual execution of apoptosis. However, caspase-3 properties are not only apoptotic, it...
|
|
|
Characterization of pancreatic beta cells after their in vitro proliferation induced by synthetic modified mRNA
Veľasová, Adriana ; Koblas, Tomáš (advisor) ; Černá, Věra (referee)
The origin and development of type I. and II. diabetes mellitus is directly related to homeostasis of proliferation and apoptosis of pancreatic β-cells. Any imbalance that leads to a decrease in the number of β-cells consequently increases the pro- bability of developing this disease. Patients suffering from diabetes mellitus are de- pendent on partial or complete exogenous insulin replacement, as their pancreas is unable to meet the body's insulin needs. Therefore a need for restoration of normal β-cell mass in diabetic patients leads to the attempts to develop new therapeutic approaches that could expand remaining β-cells of the organism and restore phys- iological insulin production. A major obstacle in this regard is a low sensitivity of terminally differentiated β-cells to mitogenic stimuli that could induce the entry of β-cells into the cell cycle. Activation of β-cell proliferation is associated with the G0/G1/S cell cycle transi- tion, which is under the control of retinoblastoma protein (RB). In order to activate cell cycle entry RB must be phosphorylated. RB phosphorylation is provided by specific cell cycle regulators, particularly cyclin-dependent kinases 4 and 6, which associate with family D cyclins. In accordance with the aim of this Diploma thesis, the effect of these cell cycle...
|
|
|
Plant alkaloid sanguinarine and its derivatives
Tůmová, Lucie ; Stiborová, Marie (advisor) ; Hýsková, Veronika (referee)
This work is summarizing actual knowledge about sanguinarine and quaternary benzo[c]fenanthridine alkaloids. The quaternary benzo[c]fenanthridine alkaloids were found in roots plants Sanguinaria canadensis and Macleaya cordata. This plants are used in tradicional Chinese medicine for its antimycotic, antibacterial and anti-inflammatory activities since antiquity. Regarding to possibility quaternary benzo[c]fenanthridine alkaloids to induce apoptosis these investigated such as possible agents for cancer treatment. The quaternary benzo[c]fenanthridine alkaloids interact with DNA and proteins. They are able to intercalate to the DNA. The alkaloids can be used like fluorescence DNA probe. Metabolism by sanguinarine and next quaternary benzo[c]fenanthridine alkaloids has not yet completely determinated. The first step sanguinarine detoxication is its conversion to less toxic dihydrosanguinarine. Sanguinarine oxidation is mediated by cytochrome P450 1A1. Key words: Quaternary benzo[c]fenanthridine alkaloids, sanguinarine, apoptosis, intercalate, heterogenous substances, enzymes, cytochrom P450
|
|
|
Apoptosis of pancreatic β-cells induced by endoplasmic reticulum stress and its mechanisms in type 2 diabetes
Glatzová, Daniela ; Němcová, Vlasta (advisor) ; Libusová, Lenka (referee)
Increasing incidence of type 2 diabetes represents one of the principal threats to human health in the 21st century. Strong evidence indicates that the rise in incidence of type 2 diabetes is correlated with increasing levels of obesity and that important factor playing role in the development of this disease is an elevation in circulating glucose and fatty acids. Chronically increased concentration of these nutrients was shown to induce apoptosis of pancreatic beta-cells that subsequently contributes to diabetes progression. Despite intensive research, molecular mechanisms underlying this beta-cells loss are still unclear. However, there is increasing evidence that one of the key processes involved in glucose and fatty acid-induced beta-cell death is induction of endoplasmic reticulum stress. The aim of this work is to summarize the recent knowledge about induction of apoptosis by endoplasmic reticulum stress in pancreatic beta-cells in relation to type 2 diabetes.
|
|
|
Role of DD- and DED-containing adaptor proteins in apoptotic signaling
Čaja, Fabián ; Anděra, Ladislav (advisor) ; Janštová, Vanda (referee)
Proteins containing a bundle of six anti-paralel α-helices in so-called "death domain" (DD) and similar structures (DED, CARD) represent important players in apoptotic signaling. To DD/DED/CARD domains-containing proteins belong pro- apoptotic membrane receptors from the TNFR superfamily, then adaptor proteins and enzymes as proteases or kinases. These pro-apoptotic "death receptors" interact with adaptor proteins and initiator caspases containing DDs or DEDs and activate apoptotic signaling cascade. DEDs and DDs are in addition found in many proteins participating in activation of caspases or other non-apoptotic signaling. Many experimental models document that defects in and deregulations of proteins containing DDs and DEDs can have severe if not lethal consequences for an organism. Abberations in these proteins in many cases could lead to cancerogenesis, immunodeficiencies or developmental defects.
|
|
|
Mechanism of tumor development and its influencing by ellipticine
Parisová, Martina ; Stiborová, Marie (advisor) ; Moserová, Michaela (referee)
Ellipticine (5.11-dimethyl-6H-pyridate [4,3-b] carbazole) is a powerful anti-cancer agent, exhibiting multiple mechanisms of action. This work describes the causes of cancer processes and summarizes the main pharmacological mechanisms and cytotoxic effects of ellipticine together with the results found in our laboratory indicating, a new mechanism of ellipticine action. Cytotoxic and mutagenic activity of ellipticine is attributed to its two mechanisms of activity ellipticine intercalation into DNA and its effectivity to inhibit topoisomerase II. Ellipticine also forms covalent DNA adducts after its oxidation with cytochromes P450 and peroxidases. Cytochromes P450 oxidize ellipticine up to five metabolites, of which 13- hydroxyellipticin, 12-hydroxyellipticin and N(2)-oxide of ellipticine are responsible for formation of two major DNA adducts. In the case of peroxidases, ellipticine is oxidized to a radical producing the ellipticine dimer and a minor ellipticine metabolite, the N(2)-oxide of ellipticine. Because of the high efficiency of ellipticine and its derivatives against various types of cancer, this coumpound is studied in detail. Its utilization for drug tangeting is a challenge for further study.
|
guest ::
