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  • 學位論文

利用桿狀病毒表現系統於昆蟲細胞與哺乳動物細胞表現曲弓熱病毒披膜蛋白之研究

Using Baculovirus Expression Vector System to express envelop proteins of Chikungunya Virus in insect cells and mammalian cells

指導教授 : 吳宗遠

摘要


摘要 目前為止,自非洲至東南亞、南美以及南歐等地區皆曾爆發過由Aedes蚊子帶原曲弓熱病毒並傳染人類的疫情。然而,目前對於能引起對抗曲弓熱病毒的抗原標的所知甚少,且仍無核准之疫苗或是專一性的抗病毒療法來預防與治療曲弓熱。桿狀病毒由於其具有作為良好疫苗載具之特性,亦被認可為一種新穎之疫苗載體,而本研究預計使用此系統開發一有效及安全的曲弓熱病毒疫苗。首先,我們將曲弓熱病毒之結構蛋白構築於單一啟動子(CMV)以及雙啟動子(CMV及pH)之雙效表現載體中,並生產vAc-CMV-CHIKV26S-Rhir-EGFP及vAc-CMV-pH-CHIKV26S-Lir-EGFP之重組病毒,其中表現綠螢光蛋白有利於觀察病毒感染情形及病毒株之單株化。我們初步觀察到此兩株重組病毒在昆蟲細胞中可引發細胞融合之現象。然而,在西方點墨法及免疫螢光染色分析下,我們意外發現受vAc-CMV-CHIKV26S-Rhir-EGFP病毒感染之昆蟲細胞,也能偵測到E1及E2蛋白之表現,顯示CMV啟動子可能在昆蟲細胞中具有轉錄活性。我們也進一步將此兩株病毒轉導至哺乳動物細胞中。在西方點墨法的分析下再次確認E1及E2蛋白可以在昆蟲細胞及哺乳動物細胞中表現,而其中以雙效啟動子所調控之E1及E2蛋白的表現量高於單一啟動子。另一方面,我們也證明在哺乳動物細胞中表現的E1及E2蛋白大多具有醣基化修飾。未來我們計畫在哺乳動物細胞中生產曲弓熱的類病毒顆粒(VLP),以期將來可以作為曲弓熱病毒之疫苗。

並列摘要


ABSTRACT Currently, Chikungunya virus (CHIKV) transmitted to humans by Aedes mosquitoes has distributed from Africa to Southeast Asia, South America, and South Europe. However, little is known about the antigenic targets for immunity, and there are no licensed vaccines or specific antiviral treatments for the disease caused by CHIKV. Baculovirus has been recognized as a novel vaccine vector with attractive characteristic features of an optional vaccine delivery vehicle. This approach provides the safety and efficacy of CHIKV vaccine. In this study, bi-cistronic recombinant baculoviruses vAc-CMV-CHIKV26S-Rhir-EGFP and vAc-CMV-pH-CHIKV26S-Lir-EGFP were produced. Both recombinant baculovirus can express EGFP reporter gene in insect cells to facilitate the recombinant virus isolation and purification. Examination of vAc-CMV-CHIKV26S-Rhir-EGFP and vAc-CMV-pH-CHIKV26S-Lir-EGFP showed that this recombinant baculovirus could induce syncytium formation in insect cells. Unexpectedly, the immunofluorescence assay revealed the expression of E1 and E2 of CHIKV structural proteins in insect cells infected by vAc-CMV-CHIKV26S-Rhir-EGFP. This result may imply that the CMV promoter can induce the transcription of CHIKV26S in insect cells. There are also E1 and E2 expression in mammalian cells transduced by vAc-CMV-CHIKV26S-Rhir-EGFP and vAc-CMV-pH-CHIKV26S-Lir-EGFP. The expression of E1 and E2 proteins of insect and mammalian cells was validated again by Western blot analysis. The vector construction with dual tandem promoters, which is polyhedrin and CMV promoter, has higher expression of the E1 and E2 of CHIKV structural proteins than the vector construction with CMV promoter only. Most of the E1 and E2 proteins expressed in mammalian cells were glycosylated. In the future, the expression of structural proteins of CHIKV in mammalian cells is expected can form virus-like particle, so it could be used as a vaccine for chikungunya virus.

參考文獻


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