澱粉樣胜肽β寡聚體在脂質膜上形成孔道之濃度測量

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姓名

陳佳宏(Chia-Hung Chen) 查詢紙本館藏

畢業系所

化學工程與材料工程學系

論文名稱

澱粉樣胜肽β寡聚體在脂質膜上形成孔道之濃度測量
(The Measurement of Critical Concentration to Form Amyloid Pore in Membrane by Amyloid Beta Oligomer)

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至系統瀏覽論文 (2025-8-17以後開放)

摘要(中)

β-澱粉樣胜肽寡聚體形成之離子通道被認為是誘發阿茲海默症的重要原因。此種類型之離子通道會破壞細胞內之鈣離子平衡，並導致神經細胞死亡。離子通道的生成取決於胜肽的濃度以及細胞膜本身之不飽和程度。目前仍沒有研究去測量胜肽形成離子通道的絕對濃度，然而測量此濃度卻是重要的。因為β-澱粉樣胜肽寡聚體較容易與不飽和度高的細胞膜結合並形成孔道。
大腦灰質之異常一直以來被視為是阿茲海默症的最主要病因，然而近期有關治療大腦灰質之藥物開發以及實驗研究都沒辦法有效的治癒或者是延緩阿茲海默症的症狀，所以有另一部份學者認為大腦白質之異常是誘發阿茲海默症之另一種重要病因，因大腦白質之細胞膜含有最高的不飽和度，所以我們想從此研究中以β-澱粉樣胜肽寡聚體誘發孔洞形成之觀點來解釋大腦白質異常是阿茲海默症中的一種重要病因。
在此研究中，我們發現形成離子通道所需之絕對濃度在不飽和度較高的細胞膜中比較低，且我們同時發現當加入β-澱粉樣胜肽寡聚體時細胞膜之結構會有明顯改變。最終結果闡明了β-澱粉樣胜肽寡聚體誘發孔洞形成可能是大腦白質異常之中的分子機制以及是阿茲海默症的一種重要病因。

摘要(英)

Formation of the ion channels on neuronal membranes by the amyloid beta (Aβ) oligomers is recently considered as the potential pathogenic origin of the Alzheimer’s disease (AD). These ion channels will break the balance of calcium ions across the membranes and thereby kill the neurons. The pore formation process is concentration- and membrane composition-dependent. But none of the existing studies systematically measured the critical concentrations and their composition dependence for the ion channel formation by the Aβ oligomers. Given that the abnormality on the white matter of human brains is believed to be a key factor in the AD pathogenesis and that the neuronal membranes in the white matter contain the lipids of higher unsaturation degrees, figuring out how the critical concentration of the ion channel formation correlates with the membrane composition may elucidate the molecular mechanism underlying the pathogenic involvement in AD of the white matter. In this study, we used lipids with different unsaturation degrees to construct the model membrane systems and to mimic the different unsaturation degrees between the white matter and grey matter of human brains. We found that the critical concentration for the ion channel formation decreased with increasing the unsaturation degree of the membranes. Moreover, the structural variation of the membranes arising from the Aβ-membrane interaction differed when the membrane composition was different.

關鍵字(中)

★ β-澱粉樣胜肽寡聚體
★ 離子通道
★ 濃度

關鍵字(英)

論文目次

TABLE OF CONTENT
摘要 I
Abstracts II
致謝 III
TABLE OF CONTENT IV
TABLE OF FIGURES VI
CHAPTER 1 1
1-1 Alzheimer’s disease 1
1-2 Amyloid beta peptide (AβP) 2
1-3 Cell membrane and model membrane 5
1-3-1 Lipid molecules and unsaturation degree 5
1-3-2 Lipid composition of gray matter and white matter 7
1-3-3 Model membrane 11
1-4 Motivation 12
CHAPTER 2 Experimental 13
2-1 Materials 13
2-2 Instruments 17
2-2-1 Small angle X-ray scattering (SAXS) and data analysis 17
2-2-2 Small angle neutron scattering (SANS) 18
2-2-3 Fluorescence spectroscopy 21
2-2-4 Fura-2 fluorescence 21
2-2-5 Ultraviolet-visible spectroscopy 22
2-2-6 Dynamic light scattering (DLS) 23
2-3 Sample preparation 24
2-3-1 Buffer solution 24
2-3-2 Amyloid beta preparation 25
2-3-3 Vesicles preparation 26
2-3-4 Fura-2 leakage experiment 28
2-4 Data analysis 29
2-4-1 SAXS data analysis 29
2-4-2 SANS data analysis 32
2-4-3 Leakage experiment data analysis 33
CHAPRER 3 Result 33
3-1 Determine the particle size of the vesicles 34
3-2 Determination of peptide concentration 40
3-3 Vesicle integrity lost induce by interaction between peptide and membrane 40
3-4 Vesicle morphology change after added the amyloid beta peptide 51
CHAPTER 4 DISCUSSION 70
CHAPTER 5 CONCLUSION 74
References 76
APPENDIX 81

參考文獻

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指導教授

陳儀帆(Yi-Fan Chen)

審核日期

2020-8-17

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