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Adenosine metabolism and its role in cell physiology
Neumannová, Kateřina ; Novotný, Jiří (advisor) ; Hansíková, Jana (referee)
Adenosine is not just a major component of important molecules such as ATP, RNA or cAMP, but also has its own signaling function. Therefore, its extracellular level is strictly maintained by balance in its formation, degradation and transport. Both inside and outside the cell adenosine is formed mainly through degradation of ATP and is eliminated by two enzymes, adenosine kinase and adenosine deaminase. Transport of adenosine through the cell membrane is provided by nucleoside transporters, which are either equilibrative or concentrative according to the mechanism of transfer. All three processes described above contribute to maintaining adenosine level under normal conditions and its increase in pathological situations. Extracellular adenosine as a signal molecule binds to adenosine receptors (subtypes A1, A2A, A2B, A3) that affect many cellular signaling pathways via G-proteins. By these pathways adenosine regulates energy homeostasis, controls the function of various organs and also modulates the nervous and immune system and thus it may participate in a number of pathological processes. Pharmacological affecting of specific adenosine receptors or enzymes involved in its metabolism can serve as an effective therapy. Some drugs based on this system are already in use, others are being tested, and many...
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The influence of perinatal hypoxia on motoric development on laboratory rat and means of therapy
Vachovcová, Sylva ; Mareš, Pavel (advisor) ; Stuchlík, Aleš (referee)
Severe perinatal hypoxia represents a substantial brain injury in human newborns. This Diploma thesis is focused on long-term motor outcome of laboratory rat after moderate perinatal hypoxia. We described some behavioral test for detection motor development and presented the influence of perinatal hypoxia on central nervous system. We also discussed an effect of agonists and antagonists of adenosine A1 receptor in brain. The aim of an experimental part was an evaluation of long-term motor behavior in rats affected by perinatal hypoxia. To cause perinatal hypoxia we put pregnant female rats to a hypoxic (10% O2) normobaric room in 11th day of their gestation. The pregnant female rats stayed in hypoxic room until they gave a birth and 6 more days after birth with their litters. For classification of motor development we used battery of tests of motor coordination. These tests correspond to the level of development of the rat. Then a group of rats with perinatal hypoxia was treated by a single administration of an agonist of adenosine A1 receptor 2-chloro-N(6)- cyclopentyladenosin (CCPA) in postnatal day 14. The animals affected by perinatal hypoxia show motor deficits in 3 from 4 selected behavioral tests. Otherwise, this motor behavior was no longer detected in young adults. The rats affected by...
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Efekt ADGF-A RNAi na imunitní odpověď \kur{Drosophily melanogaster} po infekci parazitickou vosou
ŠNEBERGEROVÁ, Pavla
In previous studies the extracellular adenosine has been proved as an important signaling molecule controlling dynamics of the immune response in Drosophila melanogaster. In mammals the adenosine signaling and control is more complex process. Since there is a certain genetic and evolutionary conservation between mammals and invertebrates, Drosophila represents simple system how to study such a complex regulation in vivo. Mutations of adenosine receptor in all cells as well as downregulation of ENT2 in immune cells caused decrease of resistance of the immune system against Drosophila parazitoid. The aim of the thesis is to determine whether RNAi targeted against mRNA of adenosine deaminase ADGF-A, which degrades e-Ado under natural conditions, would have any effect on immune response.
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Alignment of DNA Parts
Pejř, Václav ; Burgetová, Ivana (referee) ; Rozman, Jaroslav (advisor)
This thesis deals with finding the possibilities within the sphere of alignment of DNA sequences. Based on these findings, the best solution should be found with regard to the quickness of computation and quality of alignment. Following this I intend to implement and thus create a functioning program that will do the alignment. The thesis starts with introducing issues dealing with biology, DNA and genetics. The introduction is followed by a survey of algorithms that are used for alignment, their evaluation and selection of the most appropriate algorithm for the implementation. The thesis also focuses on the usage of parallel programming by means of OpenCL libraries. The alignment is being done above many sequences at the same time, so that the methods how this process can be done and how to reach the best results are being examined.
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Effect of adenosine on Salvador/Warts/Hippo signaling pathway in \kur{Drosophila melanogaster}
FILIP, Tomáš
Adenosine is a ubiquitous metabolite that has various functions in organisms. We examined in this thesis possible interactions between adenosine and Salvador/Warts/Hippo signaling pathways. The results suggest that Adenosin may influences the expression of four important Salvador/Warts/Hippo signaling pathway genes. Our results also suggest strong effect of nutritional diet composition on the expression of these genes.
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Effect of Extracellular Adenosine on \kur{Drosophila melanogaster} Cells
HOLÁ, Hana
The effects of extracellular adenosine on Drosophila melanogaster cell lines Cl.8+, Mbn-2, S2 were examined. The cells were grown in the complete medium and tested for growth rate with in presence or absence of adenosine, dipyridamole, uridine and deoxycoformycin. The S2 cells were tested for cAMP production in presence or absence of adenosine.
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The characterization of adenosine signal pathway in \kur{Drosophila} imaginal disc cells
TICHÝ, Vlastimil
The aim of this work was to characterise the influence of adenosine on imaginal disc cell line Cl8+ of Drosophila. I prepared stable cell lines with the overexpression or RNA interference of genes coding adenosine receptor AdoR (CG9753) and adenosine transporter DmENT2 (CG11045) in D. melanogaster. These cell lines were subsequently used to test their response to extracellular adenosine signal by the measurement of cell viability and level of second messengers cAMP and Ca2+ in Cl8+ cells.
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