- About
-
The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
provided by the
Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
Search results
Showing 41 to 46 of 46 (0.018 seconds)| 41 |
The role of pou2/spiel-ohne-grenzen (spg) in brain and endoderm development of the zebrafish, Danio rerioReim, Gerlinde 04 August 2003 (has links) (PDF)
The central theme of development, how cells are organized into functional structures and assembled into whole organisms, is addressed by developmental biology. One important feature of embryonic development is pattern formation, which is the generation of a particular arrangement of cells in three-dimensional space at a given point of time. Central to this work is the model system of the zebrafish, Danio rerio. The aim of the first part of this study was to try to understand how a distinct part of the embryonic brain called midbrain-hindbrain boundary (MHB), a region that acts as an organizer for the adjacent brain regions, is established in vertebrates. spiel-ohne-grenzen (spg) is one mutant which interferes with MHB development. Here, I addressed the role of pou2 in brain development by molecular, phenotypical and functional analysis. By genetic complementation and mapping I could elucidate the molecular nature of this mutant and found that the pou2 gene encoding the POU domain transcription factor is affected in spg mutant embryos. By chromosomal syntenic conservation, phylogenetic sequence comparison, and expression and functional data I imply that pou2 is the orthologue of the mammalian Oct4 (Pou5F1) gene. I find by detailed expression and transplantation analysis that pou2 is cell autonomously required within the neuroectoderm to activate genes of the MHB and hindbrain primordium, like pax2.1, wnt1, gbx2 or krox20. By gain-of-function experiments I demonstrate that pou2 synergizes with Fgf8 signaling in order to activate particularly the hindbrain primordium. Since pou2 is already provided to the embryo by the mother, I generated embryos which lack maternal and zygotic pou2 function (MZspg) to reveal a possible earlier than neuroectodermal role of pou2. In the second part of this work I demonstrate that pou2 is a key factor controlling endoderm differentiation. By expression and gain-of-function analysis I suggest a cell autonomous function for Pou2 in the first step of endodermal differentiation. By gain-of-function experiments involving the gene encoding the HMG transcription factor Casanova (Cas) I show that both Cas and Pou2 are necessary to activate expression of the endodermal differentiation marker sox17 in a mutually dependent way, and that the ability of Cas to ectopically induce sox17 strictly requires Pou2. I conclude that both maternal and zygotic pou2 function is necessary for commitment of endodermal progenitor cells to differentiate into endodermal precursor cells.
|
| 42 |
Funktionelle Analyse und Charakterisierung des Gpr1-Proteins in der Hefe Yarrowia lipolyticaGentsch, Marcus 11 November 2003 (has links) (PDF)
In der Hefe Yarrowia lipolytica führen Mutationen im GPR1-Gen zu Essigsäuresensitivität. Die Deletion dieses Genes hat demgegenüber keinen Effekt auf den Phänotyp. In dieser Arbeit wurde das Gpr1-Protein näher charakterisiert. Es zeigte sich, dass GPR1-Mutantenstämme wesentlich schneller Acetat akkumulierten als der Wildtyp. Außerdem konnte bestetigt werden, dass Gpr1p ein integrales Membranprotein ist. Mittels Ortspezifischer Analyse wurden verschiedene funktionelle Bereiche untersucht. Das Protein unterliegt zudem einer Phosphorylierung/Dephosphorylierung. Auf der Grundlage der dargelegten Ergebnisse wurde ein Funktionsmodell für Gpr1p erstellt.
|
| 43 |
Translationsaktivatoren der mitochondrialen Cytochrom b-Synthese in Saccaromyces cerevisiae: Membranassoziation, Mutagenese und Protein-Wechselwirkungen von Cbs1pKrause-Buchholz, Udo 10 September 2000 (has links) (PDF)
Die vorliegende Arbeit beschäftigt sich mit Cbs1p und Cbs2p, zwei spezifische Translationsaktivatoren der COB-mRNA. Im Mittelpunkt standen sowohl die weitere molekularbiologische und biochemische Charakterisierung von Cbs1p als auch ein Screening von Interaktionskandidaten, die mit Cbs1p und/oder Cbs2p physikalisch wechselwirken könnten. Cbs1p liegt als peripheres Membranprotein fest mit der inneren Mitochondrienmembran matrixseitig assoziiert vor. Dabei spielen möglicherweise hydrophobe und/oder Protein-Protein-Wechselwirkungen mit integralen Membranproteinen eine essentielle Rolle bei der Membranverankerung von Cbs1p. Durch die Identifizierug von atmungsdefekten Cbs1p-Mutanten, deren Mutationen in Bereichen mit Homologie zu RNA-bindenden Proteinen liegt, verstärken sich die Hinweise zur Beteiligung von Cbs1p an der direkten physikalischen Wechselwirkung mit dem 5´-leader der COB-mRNA. Darüber hinaus konnte gezeigt werden,, dass die abspaltbare Präsequenz nicht notwendig für einen mitochondrialen Import ist. Die Ergebnisse präzisieren und erweitern das vorliegende Modell der Wirkungsweise der Translationsaktivatoren Cbs1p und Cbs2p (Michaelis, 1991). Aufgrund der Membranverankerung von Cbs1p wird auch die gebundene COB-mRNA in räumlicher Nähe zur Membran gebracht. Darüber hinaus definiert Cbs1p damit möglicherweise auch den Ort der Insertion des nascierenden Apocytochrom b in die Membran. Cbs2p vermittelt die Bindung zur kleinen Untereinheit der mitochondrialen Ribosomen und könnte seinerseits ebenfalls in Interaktionen mit Untereinheiten des bc1-Komplexes involviert sein.
|
| 44 |
Studies of the expression and characterization of various transport systems at RBE4 cells, an in vitro model of the blood-brain barrier / Studien zur Expression und Charakterisierung verschiedener Transport Systeme an RBE4 Zellen, einem in vitro Modell der Blut-Hirn SchrankeFriedrich, Anne 05 July 2003 (has links) (PDF)
The purpose of this study was the investigation of several transport systems expressed at the BBB. The identification and functional characterization of such transport systems is essential to provide a basis for strategies to regulate drug disposition into the brain. Immortalized rat brain endothelial cells (RBE4 cells) have been used in this study as an in vitro model of the BBB. The present study has shown that the RBE4 cells are a suitable model of the BBB for transporter studies. These cells do express the amino acid transport systems L and y+, which are known to be present at the BBB. The uptake of L-tryptophan, a neutral amino acid transported by system L, exhibited a half saturation constant (Kt) of 31 µM and a maximal velocity rate (Vmax) of about 1 nmol/mg/min in RBE4 cells. The kinetic constants of the L-arginine uptake, representing system y+ transport activity, into RBE4 cells were determined with a Kt value of about 55 µM and a Vmax of 0.56 nmol/mg/min. Furthermore the expression of two sodium dependent transporters, the 5-HT transporter (SERT) and the organic cation/carnitine transporter OCTN2, was shown at the RBE4 cells. Uptake studies with radiolabeled 5-HT exhibited a saturable, sodium dependent transport at RBE4 cells with a Kt value of about 0.40 µM and a Vmax of about 52 fmol/mg/min. L-carnitine and TEA (tetraethylammonium) are known to be transported by the OCTN2 transporter. The uptake of L-carnitine into RBE4 cells was shown to be sodium dependent and saturable with a Kt value of 54 µM and a maximal velocity of about 3.6 pmol/mg/min. In contrast, the organic cation TEA follows a sodium independent uptake mechanism at RBE4 cells. Also a sodium independent choline uptake into the cells was discovered but the molecular identity remained unknown. This saturable choline transport exhibited a Kt value of about 22 µM and a maximal velocity of about 52 pmol/mg/min.
|
| 45 |
Patterning of the embryonic vertebrate Brain in Response to Fibroblast Growth Factor Signaling / Fgf-abhängige Musterbildungsprozesse in der embryonalen Entwicklung des WirbeltiergehirnsRaible, Florian 23 June 2003 (has links) (PDF)
The term "pattern formation" refers to the process by which order unfolds in development. The present thesis deals with a particular aspect of molecular pattern formation during vertebrate embryogenesis. The model system in the focus of this study is the zebrafish, Danio rerio. In the early developmental phases of the zebrafish, Fibroblast growth factors (Fgfs) are involved in the molecular patterning of various tissues, including two regions of the brain, the forebrain and the midbrain-hindbrain region, affecting cellular processes as diverse as cell proliferation, differentiation, and axonal targeting. The goal of this study was to better understand the mechanisms by which Fgf signaling regulates pattern formation and embryogenesis. I addressed this question on several levels, investigating the extent of intracellular signaling (MAPK activation) relative to sources of Fgf expression, and the transcriptional responses of cells to Fgf signaling during embryogenesis. By a macroarray analysis, I identified putative transcriptional targets of Fgf signaling in late gastrulation, providing a set of molecules that are likely to act as functional players in relaying the patterning information encoded by Fgf signals. Among those are the secreted signaling molecules Chordin and Wnt8, as well as Isthmin, a novel secreted molecule that I found capable to interfere with anterior embryonic patterning. In addition, I identified two ETS domain transcription factors, Erm and Pea3, which constitute bona fide integrators of FgfR signaling. By gain- and loss-of-function studies, I demonstrate that transcript levels of erm and pea3 are tightly regulated by Fgf signaling. Detailed analysis of the expression patterns of erm and pea3 along with other Fgf target genes also provides evidence for a differential read-out of Fgf concentration in the embryo, consistent with a role of Fgf as a vertebrate morphogen. The discovery of novel molecular components downstream of Fgf receptor activity paves a way to characterize previously unknown or underestimated developmental roles of Fgfs in the molecular patterning of the forebrain, the eye and parts of the neural crest.
|
| 46 |
Immunmodulation durch Parapocken-Viren: Identifikation und Analyse funktionaler ViruskomponentenScholz, Kai 29 July 2003 (has links) (PDF)
Fusionspeptid-, Redox-, Viruscore- und sonstige Proteine. Alle analysierten Single ORF (SO)-VVOV Rekombinanten vermittelten einen signifikanten Schutz vor einer tödlichen Belastung mit Aujeszky-Virus. Zwei der Rekombinanten (SO 93-, SO 94-VVOV) enthalten ORFs, die für ATI/Fusionspeptid-Proteine kodieren. In SO 19- und SO 70-VVOV sind dagegen für Redoxproteine kodierende ORFs integriert. Weiterführende Untersuchungen zeigten, dass SO 94- und SO 19-VVOV in zwei weiteren Modellsystemen immunstimulatorisch aktiv sind. Im Baculo-Virussystem exprimierte Proteine waren nur in Kombination mit Vaccinia Lister-Virus (VV) wirksam. Dabei zeigten jeweils Virus-Protein-Gemische mit dem geringsten Proteinanteil den stärksten immunstimulatorischen Effekt. Proben in denen VV durch bovines Herpes-Virus-1 ersetzt wurde, sind dagegen nicht wirksam. Dies lässt auf eine Beteiligung VV-spezifischer Faktoren schließen. Übereinstimmend mit diesen Ergebnissen führte eine Frameshift-Mutation in ORF 94r von SO 94mut-VVOV nur zur Abschwächung und nicht zum vollständigen Verlust der immunstimulatorischen Wirkung. Beide in Schizosaccharomyces pombe exprimierten Proteine, sp-ORF19 und sp-ORF94r, induzierten keinen signifikanten Schutz im Aujeszky Maus Modell. Mit der Identifikation einzelner immunstimulatorisch aktiver PPVO-Komponenten ist es erstmals gelungen, den paramunisierenden Effekt von Parapox-Viren einzelnen viralen Genen zu zuordnen. Insbesondere stellen SO 94- und SO 19-VVOV viel versprechende Kandidaten für die prophylaktische bzw. therapeutische Anwendung in verschiedenen Indikationen als auch für weitere Untersuchungen des Wirkmechanismus dar.
|
Page generated in 0.0279 seconds