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Investigation on the relationship between protein aggregation and neurodegeneration of polyglutamine disease in an inducible drosophila model.

Wong, Siu Lun. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2007. / Includes bibliographical references (leaves 129-141). / Abstracts in English and Chinese. / Abstract --- p.i / Abstract (Chinese version) --- p.iii / Acknowledgements --- p.iv / List of Abbreviations --- p.v / List of Tables --- p.vii / List of Figures --- p.viii / Chapter 1. --- INTRODUCTION / Chapter 1.1 --- Neurodegenerative disorders - a brief overview --- p.1 / Chapter 1.2 --- Polyglutamine diseases --- p.2 / Chapter 1.3 --- Microscopically visible polyglutamine protein aggregates and its relation to toxicity --- p.7 / Chapter 1.4 --- Polyglutamine protein conformers and their relation to toxicity --- p.10 / Chapter 1.5 --- Modeling polyglutamine diseases in Drosophila / Chapter 1.5.1 --- GAL4/UAS spatial transgene expression system in Drosophila --- p.14 / Chapter 1.5.2 --- Temporal control of GAL4/UAS transgene expression system in Drosophila --- p.16 / Chapter 1.5.3 --- Drosophila as a model to study human pathologies --- p.19 / Chapter 1.5.4 --- Drosophila as a model to study polyglutamine diseases --- p.21 / Chapter 1.6 --- Aims of study --- p.26 / Chapter 2. --- MATERIALS AND METHODS / Chapter 2.1 --- Drosophila culture and manipulation / Chapter 2.1.1 --- Drosophila culture --- p.27 / Chapter 2.1.2 --- Phenotypic examination of adult external eye degeneration --- p.27 / Chapter 2.1.3 --- Pseudopupil assay of adult retinal degeneration and observation of green fluorescent protein in adult eyes --- p.28 / Chapter 2.2 --- Semi-quantitative Reverse Transcription-Polymerase Chain Reaction / Chapter 2.2.1 --- RNA extraction from adult Drosophila heads --- p.30 / Chapter 2.2.2 --- DNase treatment of extracted RNA --- p.31 / Chapter 2.2.3 --- Reverse transcription-Polymerase Chain Reaction (RT-PCR) --- p.31 / Chapter 2.2.4 --- Agarose gel electrophoresis --- p.33 / Chapter 2.3 --- Sodium Dodecyl Sulfate-Polyacrylamide Gel Electrophoresis (SDS-PAGE) / Chapter 2.3.1 --- Protein extraction from adult Drosophila heads --- p.33 / Chapter 2.3.2 --- Preparation of SDS-polyacrylamide gel and electrophoresis --- p.34 / Chapter 2.3.3 --- Western blotting --- p.35 / Chapter 2.3.4 --- Immunodetection --- p.36 / Chapter 2.4 --- Immunoprecipitation --- p.38 / Chapter 2.5 --- Filter retardation assay --- p.39 / Chapter 2.6 --- Isolation and solubilization of SDS-insoluble protein --- p.40 / Chapter 2.7 --- Sucrose gradient sedimentation --- p.41 / Chapter 2.8 --- Preparation of Drosophila tissues for immunofluorescence analysis / Chapter 2.8.1 --- Dissection and immunostaining of Drosophila larval imaginal eye discs --- p.42 / Chapter 2.8.2 --- Cryosectioning and immunostaining of adult Drosophila heads --- p.44 / Chapter 2.9 --- Atomic force microscopy --- p.47 / Chapter 2.10 --- Reagents and buffers / Chapter 2.10.1 --- Reagents for Drosophila culture --- p.48 / Chapter 2.10.2 --- Reagents for RT-PCR --- p.52 / Chapter 2.10.3 --- Reagents for SDS-PAGE --- p.54 / Chapter 2.10.4 --- Reagents for immunoprecipitation --- p.57 / Chapter 2.10.5 --- Reagents for filter retardation assay --- p.57 / Chapter 2.10.6 --- Reagents for isolation and solubilization of SDS-insoluble protein --- p.58 / Chapter 2.10.7 --- Reagents for sucrose gradient sedimentation --- p.58 / Chapter 2.10.8 --- Reagents for immunofluorescence --- p.59 / Chapter 3. --- RESULTS / Chapter 3.1 --- Establishment of an inducible transgenic Drosophila model of polyglutamine diseases / Chapter 3.1.1 --- Introduction --- p.60 / Chapter 3.1.2 --- Results / Chapter 3.1.2.1 --- GAL80ts-mediated inducible expression of expanded polyglutamine protein in Drosophila / Chapter 3.1.2.1.1 --- GAL80ts controls GAL4/UAS-mediated polyQ protein expression --- p.61 / Chapter 3.1.2.1.2 --- Inducible expression of SDS-soluble expanded polyglutamine protein --- p.64 / Chapter 3.1.2.1.3 --- Inducible expression of expanded polyglutamine protein accumulates gradually in form of SDS-insoluble protein --- p.66 / Chapter 3.1.2.1.4 --- Inducible expression of expanded polyglutamine protein results in progressive accumulation of microscopically visible aggregates --- p.68 / Chapter 3.1.2.2 --- Inducible expression of expanded polyglutamine protein causes late-onset progressive neuronal degeneration in Drosophila / Chapter 3.1.2.2.1 --- Inducible expression of expanded polyglutamine protein leads to late-onset progressive deterioration of photoreceptor neurons --- p.68 / Chapter 3.1.2.2.2 --- Inducible expression of expanded polyglutamine protein neither causes external eye degenerative phenotype nor disrupts gross retinal morphology despite deterioration of photoreceptor neurons --- p.72 / Chapter 3.1.2.3 --- Co-expression of caspase inhibitor P35 suppresses polyglutamine-induced neuronal degeneration --- p.72 / Chapter 3.1.2.4 --- Co-expression of molecular chaperone Hsp70 suppresses polyglutamine-induced neuronal degeneration --- p.74 / Chapter 3.1.2.5 --- Inducible expression of expanded polyglutamine protein results in biphasic expression of molecular chaperone Hsp70 in Drosophila --- p.76 / Chapter 3.1.3 --- Discussion --- p.76 / Chapter 3.2 --- Involvement of microscopically visible polyglutamine aggregates in neurodegeneration / Chapter 3.2.1 --- Introduction --- p.83 / Chapter 3.2.2 --- Results / Chapter 3.2.2.1 --- Effect of Hsc70-K71S on microscopically visible polyglutamine aggregates and neuronal degeneration / Chapter 3.2.2.1.1 --- Co-expression of Hsc70-K71S reduces the level of microscopically visible polyglutamine aggregates --- p.83 / Chapter 3.2.2.1.2 --- Co-expression of Hsc70-K71S does not alter polyglutamine transgene expression --- p.84 / Chapter 3.2.2.1.3 --- Co-expression of Hsc70-K71S does not modify polyglutamine-induced neuronal degeneration --- p.87 / Chapter 3.2.2.2 --- Microscopically visible polyglutamine aggregates do not correlate with neuronal degeneration --- p.90 / Chapter 3.2.3 --- Discussion --- p.93 / Chapter 3.3 --- Detection of small SDS-insoluble expanded polyglutamine protein species and its association with neurodegeneration / Chapter 3.3.1 --- Introduction --- p.97 / Chapter 3.3.2 --- Results / Chapter 3.3.2.1 --- Accumulation of SDS-soluble expanded polyglutamine protein does not correlate with neuronal degeneration --- p.98 / Chapter 3.3.2.2 --- Identification of small SDS-insoluble expanded polyglutamine protein species / Chapter 3.3.2.2.1 --- Accumulation of total SDS-insoluble expanded polyglutamine protein positively correlates with progressive neuronal degeneration --- p.99 / Chapter 3.3.2.2.2 --- Accumulation of large SDS-insoluble expanded polyglutamine protein does not correlate with neuronal degeneration --- p.99 / Chapter 3.3.2.2.3 --- Accumulation of small SDS-insoluble expanded polyglutamine protein correlates with neuronal degeneration --- p.104 / Chapter 3.3.3 --- Discussion --- p.107 / Chapter 3.4 --- Biophysical characterization of small SDS-insoluble expanded polyglutamine protein species / Chapter 3.4.1 --- Introduction --- p.109 / Chapter 3.4.2 --- Results / Chapter 3.4.2.1 --- Separation of expanded polyglutamine protein species by sucrose gradient sedimentation --- p.110 / Chapter 3.4.2.2 --- Morphological studies of small SDS-insoluble expanded polyglutamine protein species by atomic force microscopy --- p.112 / Chapter 3.4.3 --- Discussion --- p.118 / Chapter 4. --- GENERAL DISCUSSION --- p.124 / Chapter 5. --- CONCLUSION --- p.127 / Chapter 6. --- REFERENCES --- p.129

Identiferoai:union.ndltd.org:cuhk.edu.hk/oai:cuhk-dr:cuhk_325947
Date January 2007
ContributorsWong, Siu Lun., Chinese University of Hong Kong Graduate School. Division of Molecular Biotechnology.
Source SetsThe Chinese University of Hong Kong
LanguageEnglish, Chinese
Detected LanguageEnglish
TypeText, bibliography
Formatprint, ix, 141 leaves : ill. (some col.) ; 30 cm.
RightsUse of this resource is governed by the terms and conditions of the Creative Commons “Attribution-NonCommercial-NoDerivatives 4.0 International” License (http://creativecommons.org/licenses/by-nc-nd/4.0/)

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