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研究生: 林浩平
Lin, Hao-Ping
論文名稱: 點帶石斑魚趨化素接受器CXCR4之功能分析
Functional Analysis of the Chemokine Receptor CXCR4 in Orange-Spotted Grouper (Epinephelus coioides)
指導教授: 陳宗嶽
Chen, Tzong-Yueh
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: 2013
畢業學年度: 101
語文別: 中文
論文頁數: 104
中文關鍵詞: 點帶石斑魚神經壞死病毒趨化素趨化素接受器CXCR4CXCL12
外文關鍵詞: grouper, nervous necrosis virus, chemokine, chemokine receptor, CXCR4, CXCL12
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  • 點帶石斑魚 (Epinephelus coioides) 是台灣最重要的海水養殖魚種,在高密度養殖過程中易受病原的威脅,尤其是魚苗時期易感染的神經壞死病毒 (nervous necrosis virus, NNV) 常造成嚴重的經濟損失。本研究室先前已成功選殖出點帶石斑魚趨化素接受器 CXCR4 基因 (gCXCR4),研究結果指出 gCXCR4除了在免疫反應上扮演重要角色外,亦參與在石斑魚早期生長方面的調控。為了瞭解 gCXCR4 在病原感染下之功能與調控,本研究主要分為三個部分做探討。第一部分針對 gCXCR4 和 NNV 之間的調控功能進行分析,藉由免疫組織螢光染色觀察感染NNV後的點帶石斑魚幼魚其 gCXCR4 在組織上的表現情形及位置,發現 gCXCR4 和 NNV 在組織上的表現有著高度的雷同性,經 GST pull-down 以及 Far western 實驗結果証明 gCXCR4 和 NNV 之coat protein (NNV-CP) 彼此間具交互作用。第二部分則以石斑魚鰭細胞株 (GF-1) 觀察點帶石斑魚CXCR4 蛋白質表現位置與特性。利用細胞骨架 f-actin 染劑可進一步觀察到無論 GF-1 細胞中大量表現 gCXCR4 或感染神經壞死病毒,皆會造成細胞型態改變,於細胞膜上產生了許多纖毛狀的構造,且兩者表現會從細胞質轉移至細胞核甚至是核仁之中。第三部分則為選殖及表現點帶石斑魚趨化素 CXCL12 (gCXCL12) 基因,並進行特性分析。該基因之全長序列已成功選殖,其 ORF 為 297 個核苷酸,並可轉譯出 98 個胺基酸。利用RT-PCR 和 Real-time RT-PCR 偵測 gCXCL12 在各組織之間的表現情形,發現 gCXCL12 在頭腎組織中表現量最高。而在攻毒實驗方面,證實 gCXCL12 基因在注射神經壞死病毒後的第 24 小時具最高表現量,於第 48 個小時發現 CXCR4 表現量亦隨之提升。根據本研究成果顯示 gCXCR4/gCXCL12 調控路徑和 NNV-CP 間的作用機制存在著密切關係,可能對於防治 NNV 造成石斑魚養殖業所帶來之危害有所助益,並可提高養殖經濟效益。

    Orange-spotted grouper (Epinephelus coioides) is the most important economical cultivate fish in Taiwan coast, but it always threatened by pathogens during intensive cultivation, especially, the nervous necrosis virus (NNV) infection causes massive mortality in grouper larvae. In order to understand the function and regulation of gCXCR4 under NNV infection, the purpose of the present study contains three portions. The first part is evaluating the relationship between NNV and gCXCR4. Immunohisto- fluorescence staining revealed that gCXCR4 was colocalized with the coat protein of NNV (NNV-CP). gCXCR4 and NNV-CP that show robust interactions in GST-pull-down experiments and far western blotting. The second part, cell culture experiments comparing with f-actin staining indicated that the overexpressed gCXCR4 protein not only distributed to cell membrane and cytoplasm but also the nucleus and nucleolus, and result in cell morphology change. The third prat is the molecular cloning and characterization of orange-spotted grouper CXCL12. The open reading frame of gCXCL12 contained 98 amino acid residues with an estimated molecule mass of 11.27 kDa. RT-PCR and Real-time RT-PCR revealed that gCXCL12 presented abundantly in head kidney. Virus challenge experiment indicated that gCXCL12 were 19.5-folds induced at 24h after viral challenge and gCXCR4 expression level were 541.1-folds increased at 48h after viral challenge subsequently. Furthermore, researching on the mechanism between gCXCR4/gCXCL12 regulation pathway in oranged-spotted groupers and NNV infection may help prevent grouper from NNV infection and promote the economic efficient in aquaculture industry.

    目錄 中文摘要 ......................................................................................................... I 英文摘要 ...................................................................................................... III 致謝 ............................................................................................................... V 目錄 .............................................................................................................. VI 表目錄 ....................................................................................................... X 圖目錄 ....................................................................................................... XI 縮寫表 ....................................................................................................... XII 研究背景 一、點帶石斑魚 (Epinephelus coioides, Orange-Spotted Grouper) ...…...… 1 二、神經壞死病毒 (Nervous Necrosis Virus, NNV) ……………...….……. 2 三、趨化素接受器 (Chemokine Receptor) ……………..……………..…… 5 四、CXCR4 …………………………………………………..……………… 6 五、趨化素 (Chemokine) ………………………………………..……..…… 8 六、CXCL12 …………………...……..……………………………………. 10 七、點帶石斑魚苗受病原感染與CXCR4之關聯 …….……….………… 13 八、研究目的 ................................................................................................ 15 材料與方法 一、實驗材料 …………………………..………………….…….………… 16 二、實驗方法及步驟 …………………………………..………..………… 19 實驗結果 一、以組織免疫螢光染色觀察 NNV 外殼蛋白與 gCXCR4 在 NNV感染 後之石斑魚苗組織中表現情形 ……….…..………………………… 37 二、GST-gCXCR4-EXI-EXIII 重組蛋白之表現載體構築 ………..…… 37 三、從In vitro 層面探討 NNV 外殼蛋白與 gCXCR4 之間的交互作用 (1) 以Far-western 實驗探討 NNV外殼蛋白與GST-gCXCR4-EXI -EXIII之間的交互作用 ……...……………………………….…… 38 (2) 利用GST pull-down 實驗探討 NNV外殼蛋白與GST-gCXCR4- EXI-EXIII重組蛋白之間的交互作用 ………………………….… 39 四、利用細胞骨架染色觀察大量表現 gCXCR4 後之石斑魚鰭細胞 GF-1 之細胞型態 ………………………………………………………… 39 五、利用細胞骨架染色觀察感染 NNV 後之石斑魚鰭細胞 GF-1 之細胞型態 ………………………………………………………………… 40 六、利用細胞免疫螢光染色觀察感染NNV後gCXCR4以及NNV-CP在石斑魚鰭細胞株GF-1中之表現位置 ………….…………...……… 41 七、點帶石斑魚 gCXCL12 基因選殖 ……………….………………… 41 八、點帶石斑魚 gCXCL12 演化樹親源分析 ……….………………… 42 九、點帶石斑魚 gCXCL12 基因在不同組織之表現情形 (1) 利用RT-PCR 實驗針對點帶石斑魚gCXCL12基因在不同組織之表現情形定性分析 ………………….………..…..……….….…… 43 (2) 利用Real-time RT-PCR 實驗針對點帶石斑魚gCXCL12基因在不同組織之表現情形定量分析 ………………..……..……..….…… 43 十、點帶石斑魚 gCXCL12 及 gCXCR4 基因在神經壞死病毒感染後之表現情形分析 ………………………………..……….......…………. 44 討論 一、點帶石斑魚 gCXCR4 和神經壞死病毒感染之關聯性功能分析 .… 45 二、點帶石斑魚 gCXCR4 在細胞中表現位置與特性分析 ………….… 47 三、點帶石斑魚 gCXCL12 基因序列分析 ………………...…………… 49 四、點帶石斑魚 gCXCL12 基因在各組織表現量分析 ………...……… 52 五、點帶石斑魚苗gCXCL12及gCXCR4基因在神經壞死病毒感染後表現. 量分析 …………………………………………………..…………..… 52 六、總結與未來發展 ………………………………...…………….……… 54 參考文獻 ...................................................................................................... 59 附圖 .............................................................................................................. 72 附表 .............................................................................................................. 96 附錄 .............................................................................................................. 98 附錄一、自然感染神經壞死病毒之點帶石斑魚眼部視網膜各層組織解剖 學結構 ................................................................................ 98 附錄二、實驗藥品及溶液配置方法 …….………….......……………….. 99   表目錄 表一、CXCR4 相關引子列表 ..................................................................... 96 表二、CXCL12 相關引子列表 ................................................................... 97   圖目錄 圖一、神經壞死病毒外殼蛋白與gCXCR4在神經壞死病毒感染後之石斑魚苗眼睛組織中表現情形 .............................................................. 72 圖二、在高倍率下神經壞死病毒外殼蛋白與gCXCR4在神經壞死病毒感染後之石斑魚苗眼睛組織中表現情形 .......................................... 74 圖三、神經壞死病毒外殼蛋白與gCXCR4在神經壞死病毒感染後之石斑 魚苗腦部以及小腸組織中表現情形 .............................................. 76 圖四、pGEX-5X-3-gCXCR4-EXI-EXIII 表現系統構築示意圖 …...... 78 圖五、利用遠端西方墨點法證明點帶石斑 gCXCR4蛋白可與 NNV外殼蛋白結合 .......................................................................................... 80 圖六、利用 GST pull-down 證明點帶石斑 gCXCR4 蛋白可與 NNV 外殼蛋白結合 ...................................................................................... 81 圖七、石斑魚鰭細胞株GF-1大量表現GFP後之細胞骨架及細胞核螢光染色 .................................................................................................. 82 圖八、石斑魚鰭細胞株GF-1大量表現gCXCR4-GFP後之細胞骨架及細胞核螢光染色 .................................................................................. 83 圖九、高倍率下觀察石斑魚鰭細胞株GF-1大量表現gCXCR4-GFP後之細胞骨架及細胞核螢光染色 .......................................................... 84 圖十、石斑魚鰭細胞株 GF-1 感染NNV後之細胞骨架及細胞核螢光染色 ………………..………………………………………………… 85 圖十一、石斑魚鰭細胞株 GF-1 感染NNV後之gCXCR4及 NNV-CP免疫螢光染色 ……..……………………………………………… 87 圖十二、點帶石斑 gCXCL12 基因 cDNA 及胺基酸序列 ................... 89 圖十三、各物種之CXCL12 胺基酸序列比對分析 ................................. 90 圖十四、依據推測之胺基酸序列所建構出之gCXCL12演化樹分析 ... 91 圖十五、各物種間 gCXCL12 核酸與胺基酸序列相似性分析 .............. 92 圖十六、利用RT-PCR針對點帶石斑魚gCXCL12蛋白質在不同組織之表現情形定性分析 .......................................................................... 93 圖十七、利用Real-time RT-PCR 針對點帶石斑魚gCXCL12蛋白質在不同組織之表現情形定量分析 ...................................................... 94 圖十八、利用 Real-time RT-PCR 針對點帶石斑魚在 NNV 刺激下 gCXCL12 及 gCXCR4 基因各時間點表現情形定量分析 … 95

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