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研究生:林宗哲
研究生(外文):Zong-Zhe Lin
論文名稱:從生化特性與功能角度探討 vimentin 在 K562 細胞分化所扮演的角色
論文名稱(外文):Biochemical and functional study of vimentin in differentiation of K562 cells
指導教授:林蔚靖
指導教授(外文):Wey-Jinq Lin
學位類別:碩士
校院名稱:國立陽明大學
系所名稱:生物藥學研究所
學門:生命科學學門
學類:生物科技學類
論文種類:學術論文
論文出版年:2012
畢業學年度:100
語文別:中文
論文頁數:68
中文關鍵詞:分化
外文關鍵詞:vimentink562differentiation
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Vimentin 是屬於中間絲 (intermediate filaments, IFs) 的細胞骨架蛋白,具有調控細胞結構的完整,影響細胞貼附和遷移,並參與訊號傳遞、細胞凋亡及免疫防禦等等功能。共價性轉譯後修飾已知能調控vimentin 絲狀結構的組成和動態平衡,進而影響其在細胞中的功能。實驗室之前利用蛋白質體學的方式及試管中 (in vitro) 反應,證實 vimentin 為蛋白質精胺酸甲基轉移酶 1 (protein arginine methyltransferase 1, PRMT1) 的新穎甲基化性受質。本研究利用蛋白質片段缺失 (truncation deletion) 以及試管 (in vitro) 甲基化分析,探討vimentin 可能的甲基化區域,結果發現 His-Vim D1 (胺基酸 1-144) 可被 GST-PRMT1 甲基化,然而 His-Vim D2 (胺基酸 136-263) 及 His-Vim D3 (胺基酸 263-467) 不會被甲基化。而 Vim D1 的甲基化程度和野生型全長 vimentin 相似。
先前實驗室研究發現以 PMA 誘導慢性骨髓白血病細胞株 (K562) 走向巨核球分化過程,vimentin 會大量表現並且會被甲基化。因此在我的研究擬利用此細胞膜型探討甲基化對 vimentin 細胞功能的影響。我利用 RNA 干擾的方式篩選出 vimentin 缺失穩定細胞株,首先探討 vimentin 在巨核細胞分化中扮演的角色,在我的實驗當中發現 vimentin 的缺失並不會影響 K562 細胞正常生長,然而明顯會促進由 PMA 誘導的巨核球分化,在細胞形態上可觀察到多葉核及空泡的增加,細胞貼附能力的上升,細胞顆粒度增加且巨核球細胞表面標記 CD41 的表現亦增加,顯示 vimentin 的缺失會促進巨核球分化。然而進一步在 PRMT1 缺失及過量表現的 K562 細胞株中並未發現 vimentin 甲基化程度發生改變,推斷在 K562 中 vimentin 的甲基化可能主要非由 PRMT1 催化,vimentin 甲基化所扮演的角色則需更多實驗來探討。

Vimentin is an intermediate filament protein which plays a pivotal mechanism in regulation of a variety of cellular processes including structural integrity of cells and tissues, adhesion and migration, signal transduction, apoptosis and immune defense. Posttranslational modifications are essential for the functional regulation of vimentin filaments through modulation of conformation and filament organization. The previous study in the research group showed that vimentin was a novel substrate of protein arginine methyltransferase 1 (PRMT1). In this study, I showed that His-vim D1 (amino acid 1-144) was methylated in vitro by GST-PRMT1 while His-vim D2 (amino acid 136-263) and His-vim D3 (amino acid 136-467) were not methylated. Methylation of His-vim D1 and wild type vimentin was similar, indicating the PRMT1 methylation sites were located in this region.
We previously found that the expression levels of vimentin were significantly induced in K562 cells during phorbol 12-myristate 13-acetate (PMA) -induced megakaryocytic differentiation and that vimentin was methylated in K562 cells. To investigate the role of vimentin in megakaryocytic differentiation, i first knocked down vimentin by using RNA interference. I found that knockdown of vimentin in K562 cells enhanced PMA-induced megakaryocytic differentiation as demonstrated by changes in cytological characteristics, adhesive properties, cell granularity and CD41 expression. However, PRMT1 knockdown or overexpression did not affect the methylation states of vimentin in K562 cells.

目錄……………………………………………………………………………………1
縮寫表…………………………………………………………………………………2
圖次目錄………………………………………………………………………………4
中文摘要………………………………………………………………………………6
英文摘要………………………………………………………………………………7
緒論……………………………………………………………………………………8
研究目標……………………………………………………………………………..16
實驗材料……………………………………………………………………………..17
材料方法……………………………………………………………………………..22
實驗結果……………………………………………………………………………..33
討論…………………………………………………………………………………..39
參考論文……………………………………………………………………………..44
圖表…………………………………………………………………………………..53


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