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研究生: 李麗卿
Li-Ching Lee
論文名稱: 第十七型脊髓小腦共濟失調症致病機轉:伴隨蛋白的保護功能與TATA結合蛋白CAG三核苷重複擴增造成不正常蛋白質摺疊之研究
Spinocerebellar ataxia 17 (SCA17) pathogenic mechanisms: Chaperones function and misfolding proteins caused by the expanded polyglutamine in TATA-binding protein
指導教授: 李桂楨
Lee, Guey-Jen
學位類別: 博士
Doctor
系所名稱: 生命科學系
Department of Life Science
論文出版年: 2009
畢業學年度: 97
語文別: 英文
論文頁數: 97
中文關鍵詞: 第十七型脊髓小腦萎縮症TBP多麩醯胺擴增細胞模式差異性螢光標記二維電泳伴隨蛋白A5伴隨蛋白A8伴隨蛋白B1基因表現分析
英文關鍵詞: spinocerebellar ataxia type 17, TBP expansion, cell model, 2D-DIGE, HSPA5, HSPA8, HSPB1, gene expression analysis
論文種類: 學術論文
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  • 摘要
    遺傳性第十七型脊髓小腦萎縮症(SCA17)與染色體6q27位置的TATA binding protein (TBP)基因的CAG三核苷重複擴增相關。TBP廣泛表現在中樞神經系統及周邊組織。臨床上SCA17病患症狀很廣泛,致病機轉亦未完全清楚。為探討SCA17疾病致病機轉,我們建立短暫大量表現及穩定誘導正常TBP-Q36及多麩醯胺擴增TBP-Q61的人類胚胎腎293細胞,並利用差異性螢光標記二維電泳、質譜、免疫轉漬等方法,分析蛋白質的表現。以doxycycline誘導表現後,擴增的TBP-Q61形成聚集,且活化的caspase-3皆顯著增加。蛋白質體分析顯示23個蛋白質的差異表現在1.35倍以上。進一步以二維電泳及西方免疫轉漬確認HSPA5、HSPA8、PARK7的差異表現。淋巴細胞的蛋白質分析顯示,與正常人的淋巴細胞相較,帶有多麩醯胺擴增TBP的病患淋巴細胞,其HSPA5、HSPA8、HSPB1的表現顯著下降。進一步利用lenti病毒轉染,檢視geldanamycin對HSPA5表現及SCA17性狀的調節。在多麩醯胺擴增TBP等位基因的檢測方面,分析了臺灣地區帕金森氏症、阿茲海默氏症、非典型帕金森氏症候群患者的TBP基因CAG 三核苷酸重複,共發現6個擴增的等位基因(44 ~ 46Q)。此類非典型小腦萎縮症病患的報導,有助於疾病性質的瞭解。綜合上述,實驗結果顯示利用蛋白質體分析來找出和SCA17疾病致病機轉相關的差異表現蛋白,有助於致病機轉的瞭解,並可能依據來發展治療策略。

    Abstract
    Expansion of the CAG repeat of the TATA-box binding protein (TBP) gene has been identified as the causative mutations in spinocerebellar ataxia 17 (SCA17). TBP is ubiquitously expressed in both central nervous system and peripheral tissues. The spectrum of SCA17 clinical presentation is broad. The underlying molecular changes of SCA17 are rarely explored. To study the molecular mechanisms underlying SCA17, transient overexpressed and stably induced isogenic 293 cells expressing normal TBP-Q36 and expanded TBP-Q61 were generated and analyzed the expressed proteins using two-dimensional difference in gel electrophoresis (2D-DIGE), followed by mass spectrometry and immunoblotting. Upon induction with doxycycline, the expanded TBP-Q61 formed aggregates with significant increase in cleaved caspase-3. Proteomics study identified a total of 23 proteins with expression changes greater than 1.35 fold. The altered expression of HSPA5, HSPA8 and PARK7 were further validated by 2D and Western immunoblot analyses. In lymphoblastoid cells, significant lower HSPA5, HSPA8 and HSPB1 expression levels were observed in cells with expanded TBP than that of the control cells. Using lentiviral transduced human neuroblastoma cell models, the effects of geldanamycin on HSPA5 expression and SCA17 phenotype were assessed. Genetic screening of triplet expansion in the TBP gene in Taiwanese Parkinson's disease, Alzheimer's disease and atypical parkinsonism revealed a total of 6 expanded alleles (44 ~ 46) in patients group. Reports of additional patients are crucial for better understanding the nature of the disease. Together, this study illustrates the utility of proteomics to identify alterations of proteins which may shed insights into the pathogenesis and lead to therapeutic interventions for this disease.

    Index I Abstract (Chinese) V Abstract VI List of figures and tables VII Introduction 1 Spinocerebellar ataxia 17: autosomal dominant cerebellar ataxia caused by the expanded polyglutamine in TATA-binding protein 1 Polyglutamine expansion diseases: plausible pathogenic mechanisms 2 Protein misfolding and aggregation 2 Oxidative stress and neuroprotection 3 Protein misfolding and endoplasmic reticulum stress 4 Transcriptional dysfunction 5 Potential therapeutic invention: chaperone activation, transcription activation and combinatorial drug therapy 6 Chaperone activation to reduce protein aggregation 6 Transcription activation to reduce protein aggregation 7 Candidate drugs and combinatorial drug therapy 7 Cellular model approach for polyQ diseases: transient/induced and neuronal/non-neuronal 8 Transient murine Neuro-2a model 8 Inducible stable human 293 cell model 8 Human neuroblastoma cell model 9 Lymphoblastoid cell lines: resource of biomaterials in research of neurological disorders 10 Proteomic approach for studying polyQ expansion diseases: 2-dimensional fluorescence difference in gel electrophoresis 11 Aims 13 Materials and methods 15 I. To generate stably induced isogenic 293 cells expressing normal and expanded TBP and analyze the expressed proteins using 2D-DIGE 15 TBP cDNA constructs 15 Cell cultivation 16 Transfection 16 Dot-blot filter retardation assay 17 Isogenic 293 cell lines 17 Immunocytochemical staining 18 Real-time qPCR 18 Western blotting 19 Caspase-3 activity 19 Protein samples preparation for proteomic analysis 19 Minimal labeling with CyDye Fluors for DIGE 20 IPG strip rehydration and first-dimension isoelectric focusing (IEF) 21 Second-dimension SDS-PAGE 21 Image analysis 22 Gel staining with SYPRO Ruby 22 In-gel digestion 22 Mass spectrometry, protein identification and confirmation 23 Metacore network analysis 24 II. To validate the identified altered expressed proteins using lymphoblastoid cell lines generated from patients with expanded TBP 24 Lymphoblastoid cell lines 24 Western blot analysis 25 III. To generate neuroblastoma SK-N-SH cell models expressing normal and expanded TBP 25 Cell cultivation and transfection 26 Lentiviral expression constructs 26 Lentivirus package and cell transductions 26 SK-N-SH stably transduced cell lines 27 IV. To assess the effects of geldanamycin and HDAC inhibitors on SCA17 phenotype 27 Cell cultivation 27 MTT assay 28 Drug effects on aggregate formation 28 Neuroblastoma cells differentiation and neurite outgrowth analysis 28 V. To set up SCA17 database in various Taiwanese disease populations 29 Subjects 29 Genetic analysis of SCA17 repeats 30 Results… 32 I. Generation of stably induced isogenic 293 cells expressing normal and expanded TBP and analysis of the expressed proteins 32 Cloning and expression of TBP constructs 32 Isogenic TBP cell lines 33 2D-DIGE analysis of the isogenic TBP cell lines 34 2D and Western immunoblot confirmation of altered HSPA5, HSPA8 and PARK7 expression 35 Overexpression of HSPA5 to reduce the aggregate formation caused by expanded TBP 35 Metacore network analysis 36 II. Validation of the altered expressed HSPA5, HSPA8 and HSPB1 using lymphoblastoid cell lines generated from patients with expanded TBP 36 Lymphoblastoid cell lines establishment 36 Analysis of HSPA5, HSPA8, HSPB1 and PARK7 expression 37 III. Generation of neuroblastoma SK-N-SH cell models expressing normal and expanded TBP 38 Transient transfected SK-N-SH cell model 38 Stably transduced SK-N-SH cell model 38 IV. Assessment of geldanamycin and HDAC-inhibitors on SCA17 phenotype 39 Drug assessment using transient transfected HEK-293 cells 40 Drug assessment using transient transduced SH-SY5Y cells 40 V. SCA17 database in various Taiwanese disease populations 41 Frequency distributions of SCA17 repeat lengths 41 Sequence analysis of SCA17 expanded alleles 41 Discussion 43 I. Stably induced isogenic 293 cell model 43 II. Lymphoblastoid cell model 46 III. Neuroblastoma cell model 47 IV. Assessment of geldanamycin and HDAC inhibitors 48 V. Genetic analysis of SCA17 repeat lengths 49 VI. Future study on diseases pathogenesis 50 VII. Conclusion 51 References 53 List of figures and tables Figure 1. Expression of TBP cDNA constructs 73 Figure 2. Expression of TBP cDNA constructs in transiently transfected HEK-293 cells 75 Figure 3. Diagram of the Flp-InTM T-RExTM system 76 Figure 4. Expression of TBP cDNA constructs in stably induced isogenic 293 cells 78 Figure 5. 2D image of soluble proteins from isogenic 293 cells 79 Figure 6. 2D and Western immunoblot analyses of the vector only and isogenic TBP lines using HSPA5, HSPA8, PARK7 and β-actin antibodies 80 Figure 7. Overexpression of HSPA5 in SCA17 transient cell model 81 Figure 8. The best ranked proteome networks delivered from the shortest path net work analysis with 1.35 threshold for 2D-DIGE data 82 Figure 9. Lymphoblastoid cell lines from normal controls and TBP expansion patients 83 Figure 10. Expression of TBP cDNA constructs in SK-N-SH cells 85 Figure 11. Titration of recombinant TBP-Q36 and TBP-Q61 lentiviral stocks 86 Figure 12. Expression of TBP cDNA constructs in lentiviral transduced stable SK-N-SH lines 87 Figure 13. The cytotoxicity of geldanamycin and HDAC inhibitors to 293FT cells 88 Figure 14. The effects of geldanamycin and HDAC inhibitor pre-treatment on aggregate formation in HEK-293 cells transiently expressed expanded TBP 89 Figure 15. Drug assessment using differentiated SH-SY5Y cells 90 Figure 16. Distributions of the SCA17 repeat lengths in controls and patients with PD, AD, or atypical parkinsonism 92 Table 1. Experimental design of 2D-DIGE gels and fluorophore labeling scheme 93 Table 2. Summary of the proteins identified by using 2D-DIGE and MALDI/TOF MS 94

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