| 研究生: |
李威漢 Li, Wei-Han |
|---|---|
| 論文名稱: |
探討神經壞死病毒複製與啟動細胞自噬之相關性 The role of betanodavirus replication on autophagy induction |
| 指導教授: |
洪健睿
Hong, Jiann-Ruey |
| 學位類別: |
碩士 Master |
| 系所名稱: |
生物科學與科技學院 - 生物科技研究所 Institute of Biotechnology |
| 論文出版年: | 2016 |
| 畢業學年度: | 104 |
| 語文別: | 中文 |
| 論文頁數: | 105 |
| 中文關鍵詞: | 神經壞死病毒 、細胞自噬作用 、活性氧化物 、Bcl-2 、JNK 、Beclin 1 |
| 外文關鍵詞: | Betanodavirus, Autophagy, Reactive oxygen species (ROS), Bcl-2, JNK |
| 相關次數: | 點閱:94 下載:2 |
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神經壞死病毒(Nervous Necrosis Virus, NNV)是一種可感染多種高經濟性魚種如石斑魚、金目鱸等,且致死率極高並對水產養殖造成大量的經濟損失。本實驗室先前研究證實神經壞死病毒感染石斑魚鰭細胞株(GF-1)會產生由活性氧分子(O2-, H2O2)所介導的自噬作用。因此本研究想要接著探討病毒的表現、複製與細胞自噬作用誘導之關聯性如何。分別利用UV光、RNA1 siRNA與蛋白質合成抑制劑Cycloheximide來抑制病毒基因與蛋白質產物之表現與合成。結果發現,病毒複製下降時其所誘導產生的活性氧分子也跟著減少,進而使得自噬作用上游分子發現AMPK與Akt活性下降及mTOR活性上升,同時發現mTOR的活化也減緩了自噬作用進行。進而分析自噬作用參與蛋白Bcl-2與Beclin 1之互動關係。結果發現病毒複製下降時,會使得自噬作用參與蛋白Bcl-2活性下降,Beclin 1活性上升。當進一步分析其上游調控分子時,發現c-Jun NH2-terminal kinase (JNK) 表現量上升,得知病毒感染時能活化JNK路徑來誘導細胞自噬之啟動。尤其以Cycloheximide處理效果最為顯著。
As we known, many fish species are infected by betanodavirus such as grouper, which has resulted in severe mortality and significant economic losses on the aquaculture industry worldwide.Autophagy is a cellular metabolic process to degrade and recycle the older or damaged organelles. Autophagic is also induced under stress and virus infection. In previous study, we know GF-1cell induced autophagy by reactive oxygen species (ROS) (O2-,H2O2) after virus infection. Here, we focused on the role of virus replication on the autophagy induction.In this study, we confirmed GF-1 induced autophagy after virus infection 48 hr by electron microscopy. Antioxidant drug DPI was demonstrated can reduced autophagy. Then, we inactivated virus by UV light、RNA1 siRNA、Cycloheximide. We found that inactived virus produced less reactive oxygen species (ROS). Less ROS caused mTOR activated by AMPK expression level decrease and Akt expression level decrease, as mTOR activated reduce autophagy after inactivated virus. Autophagy related protein Bcl-2 and Beclin 1. Bcl-2 expression level decrease and Beclin 1 expression level increase after inactivated virus. Furtermore we found the upstream factor c-Jun NH2-terminal kinase (JNK) expression level increase after virus infection. Taken together our results suggest that RGNNV induced ROS signals can induced the autophagic process by Bcl-2 phosphorylation through JNK activated. Our finding provided insight into RNA virus molecular mechanism.
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