| 研究生: |
錢舜益 Chien, Shun-Yi |
|---|---|
| 論文名稱: |
丙型干擾素誘導肺上皮惡性腫瘤進行一種類胞外捕捉性死亡 IFN-gamma induces a mimic extracellular trap cell death in lung epithelial maligancy |
| 指導教授: |
林秋烽
Lin, Chiou-Feng |
| 學位類別: |
碩士 Master |
| 系所名稱: |
醫學院 - 微生物及免疫學研究所 Department of Microbiology & Immunology |
| 論文出版年: | 2013 |
| 畢業學年度: | 101 |
| 語文別: | 英文 |
| 論文頁數: | 70 |
| 中文關鍵詞: | 丙型干擾素 、細胞自噬作用 、組蛋白瓜胺酸化 、胞外捕捉性死亡 、肺癌 |
| 外文關鍵詞: | IFN-γ, autophagy, hitone H3 citrullination, ETosis, lung cancer |
| 相關次數: | 點閱:113 下載:1 |
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丙型干擾素藉由細胞自噬作用來促進其訊息傳遞和生物功能包括發炎、抑菌以及抗癌。本篇研究著重探討細胞自噬作用對於丙型干擾素誘導細胞毒性的角色。丙型干擾素會造成肺癌細胞株A549生長抑制並產生細胞毒性。丙型干擾素不會造成細胞週期停滯卻誘導細胞凋亡的現象包括染色體的凝聚和磷脂醯絲胺酸胞外暴露,同時伴隨著細胞毒性相關的類細胞壞死現象。藉由細胞核的染色、體外核小體的偵測、電子顯微鏡觀察以及核纖層蛋白染色顯示丙型干擾素誘導類胞外捕捉性死亡,且這樣的現象是由caspase蛋白所調控。研究證實IRGM1以及ATF6蛋白調控細胞自噬作用進而促進丙型干擾素誘導細胞毒性、caspase-3蛋白的活化以及類胞外捕捉性死亡現象。由丙型干擾素誘導的NADPH氧化酶表現及下游活性氧化物會促使染色體損害進而促進類胞外捕捉性死亡。處理丙型干擾素會使得FADD蛋白會和細胞自噬體結合,顯示細胞自噬作用會誘導FADD蛋白調控caspase-3活化。在細胞自噬作用和caspase活化之後,丙型干擾素導致染色體損害並伴隨著ATR/ATM蛋白調控的類胞外捕捉性死亡以及細胞毒性產生。另外,丙型干擾素誘導的胞外捕捉性死亡取決於PAD4蛋白調控的組蛋白瓜胺酸化,而調控PAD4蛋白活化的機制包括染色體損害相關的ATR/ATM及NADPH氧化酶與內質網壓力相關的ATF6及鈣離子訊號。重要的是,生長抑制、細胞毒性、caspase-3蛋白活化、染色體損害以及類胞外捕捉性死亡在細胞自噬作用缺乏和具丙型干擾素抗性的肺癌細胞株PC14PE6/AS2無法產生。這些結果證實細胞自噬作用存在下,丙型干擾素誘導caspase調控的染色體損害伴隨著PAD4調控組蛋白瓜胺酸化的胞外捕捉性死亡現象,並提供新穎的丙型干擾素細胞毒性證據。
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