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| ???org.dspace.app.webui.jsptag.ItemTag.dcfield??? | Value | Language |
|---|---|---|
| dc.contributor.advisor | 趙本秀(Pen-Hsiu Chao) | |
| dc.contributor.author | Hsiang-Yi Hsu | en |
| dc.contributor.author | 徐向儀 | zh_TW |
| dc.date.accessioned | 2021-06-16T17:17:30Z | - |
| dc.date.available | 2013-08-22 | |
| dc.date.copyright | 2012-08-22 | |
| dc.date.issued | 2012 | |
| dc.date.submitted | 2012-08-17 | |
| dc.identifier.citation | 1. Woo, S.L., et al., Tissue engineering of ligament and tendon healing. Clin Orthop Relat Res, 1999(367 Suppl): p. S312-23.
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Biochem Biophys Res Commun, 2003. 307(2): p. 355-61. 34. Surrao, D.C., et al., A crimp-like microarchitecture improves tissue production in fibrous ligament scaffolds in response to mechanical stimuli. Acta Biomater, 2012. 35. Screen, H.R.C., et al., Local strain measurement within tendon. Strain, 2004. 40(4): p. 157-163. 36. Asparuhova, M.B., L. Gelman, and M. Chiquet, Role of the actin cytoskeleton in tuning cellular responses to external mechanical stress. Scand J Med Sci Sports, 2009. 19(4): p. 490-9. 37. Arnaout, M.A., S.L. Goodman, and J.P. Xiong, Structure and mechanics of integrin-based cell adhesion. Curr Opin Cell Biol, 2007. 19(5): p. 495-507. 38. Totsukawa, G., et al., Distinct roles of ROCK (Rho-kinase) and MLCK in spatial regulation of MLC phosphorylation for assembly of stress fibers and focal adhesions in 3T3 fibroblasts. J Cell Biol, 2000. 150(4): p. 797-806. 39. Katoh, K., Y. Kano, and S. Ookawara, Rho-kinase dependent organization of stress fibers and focal adhesions in cultured fibroblasts. Genes Cells, 2007. 12(5): p. 623-38. 40. Mackie, E.J., W. Halfter, and D. Liverani, Induction of tenascin in healing wounds. J Cell Biol, 1988. 107(6 Pt 2): p. 2757-67. 41. Sarasa-Renedo, A. and M. Chiquet, Mechanical signals regulating 39 extracellular matrix gene expression in fibroblasts. Scand J Med Sci Sports, 2005. 15(4): p. 223-30. | |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/63730 | - |
| dc.description.abstract | 在韌帶中膠原蛋白纖維呈現波浪狀的平行結構，而此種波浪狀結構帶給韌帶
良好的活動性但卻又能保護關節避免脫臼。先前研究指出當韌帶細胞在有平行的 電紡材料上會有較好的細胞外間質分泌。所以為了模擬真正韌帶中的環境，我們 的實驗主要是探討平行與波浪狀電紡絲結構的機械性質上有什麼不同，以及細胞 在此種支架上會有什麼樣的反應及表現，最後加入機械刺激後會帶給細胞什麼樣 的影響。我們利用高分子聚合物玻璃轉移溫度(T g )的這項特性，加熱聚乳酸超過 其 T g 值，使平行纖維變形而形成波浪形態的電紡絲，如此產生的纖維結構與韌 帶的機械性質較為接近。此外細胞細胞型態在波浪狀電紡絲上也與平行電紡絲有 相當大的不同，細胞及細胞骨架皆沿著纖維的走向做波浪狀的延展，但在平行電 紡絲中細胞核型態皆呈現較細長且有明顯的張力絲(stress fiber)的生成。細 胞在波浪狀電紡絲中 tenascin-C 與膠原帶白表現量明顯高於平行電紡絲。經由 拉伸刺激之後，在波浪狀電紡絲上的細胞型態有著明顯的改變，且膠原蛋白的表 現量也有明顯上升的趨勢。這說明了波浪狀電紡絲結構會影響細胞型態，且經由 拉伸刺激波浪狀的纖維會帶給細胞不同的刺激進而促進細胞有良好的表現。 | zh_TW |
| dc.description.abstract | Native ligament tissue is composed with aligned-wavy collagen fiber, and the wavy structure is believed to provide ligament with mechanical properties to support joint movement while preventing dislocation. Previous studies demonstrate that cells seeded on aligned electrospun fiber had higher extracellular matrix synthesis. Thus, The aim of this study is to investigate the effects of biomimetic wavy electrospun fiber scaffolds on material properties and cell physiology. We also examined the effects of mechanical stimulation on phenotypic expression.. We successfully fabricated aligned wavy fiber scaffold by heating straight electrospun PLLA polymers over its glass transition temperature (Tg). Our results show that the wavy fiber exhibit nonlinear mechanical properties more similar to those of ligament compared with straight fibers. Furthermore, cell morphology on wavy fiber is significantly different from the straight fibers. The cytoskeleton elongates with the wavy fiber, suppressing stress fiber formation, Comparing with the straight fiber group, nucleus shape on wavy fibers has smaller aspect ratio. Fiber morphology also affects cells phenotype. The wavy fiber substrate significantly increases collagen type I, type III and tenascin-C gene expression. After dynamic loading, gene expression of collagen type I and type III increased significantly. In summary, the wavy fiber provides a biomimetic substrate for ligament fibroblasts that will result in enhanced phenotypic gene expression | en |
| dc.description.provenance | Made available in DSpace on 2021-06-16T17:17:30Z (GMT). No. of bitstreams: 1 ntu-101-R99548046-1.pdf: 2165095 bytes, checksum: d2f84fbd6b449f4c05cbe965c2d2e57a (MD5) Previous issue date: 2012 | en |
| dc.description.tableofcontents | 口試委員會審書...2
誌謝...3 中文摘要... i Abstract ...ii Contents ... iv List of Figures ... vi List of Tables ... vii Chapter 1 Introduction ... 1 1.1 Purpose of Research ... 1 1.2 Ligament Tissue Engineering ... 2 1.3 Cell Shape and Orientation Effects Cell Phenotype ... 2 1.4 Nonlinear Elasticity of Ligament Mechanic ... 3 1.5 The effects of Mechanical Stimulation on Ligament Fibroblasts ... 4 1.6 Electrospinning ... 5 Chapter 2 Material and Method ... 7 2.1 Scaffold Preparation ... 7 2.2 Characterization of Electrospun Fiber ... 8 2.3 Mechanical Testing ... 8 2.4 Polymer Characterization... 9 2.5 Cell Culture ... 9 2.6 Tensile Loading ... 10 2.7 Cell Morphology ... 10 2.8 RNA Extraction ... 11 2.9 Quantification of mRNA Levels ... 11 2.10 Statistical Analysis ... 12 Chapter 3 Results ... 13 3.1 Fiber Waviness ... 13 3.2 Thermal Properties ... 13 3.3 Mechanical Properties ... 14 3.4 Cell Morphology ... 15 3.5 Substrate Effects Cell Gene Expression... 15 3.6 The Effects of Mechanical Stimulation ... 16 Chapter 4 Discussion ... 17 Reference ... 36 Appendix...40 | |
| dc.language.iso | en | |
| dc.subject | 細胞 | zh_TW |
| dc.subject | 電紡絲 | zh_TW |
| dc.subject | 機械刺激 | zh_TW |
| dc.subject | 基因表現 | zh_TW |
| dc.subject | mechanical stimulation | en |
| dc.subject | electrospinning | en |
| dc.subject | cell | en |
| dc.subject | gene expression | en |
| dc.title | 波浪狀電紡絲結構的機械性質與其對韌帶細胞的影響 | zh_TW |
| dc.title | Mechanical Properties of Microcrimped Fibers and Their Effects on Ligament Fibroblasts | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 100-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 蔡偉博(Wei-Bor Tsai),王兆麟(Jaw-Lin Wang),郭柏齡(Po-Ling Kuo) | |
| dc.subject.keyword | 電紡絲,細胞,機械刺激,基因表現, | zh_TW |
| dc.subject.keyword | electrospinning,cell,mechanical stimulation,gene expression, | en |
| dc.relation.page | 40 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2012-08-18 | |
| dc.contributor.author-college | 工學院 | zh_TW |
| dc.contributor.author-dept | 醫學工程學研究所 | zh_TW |
| Appears in Collections: | 醫學工程學研究所 | |
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| ntu-101-1.pdf Restricted Access | 2.11 MB | Adobe PDF |
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