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質體載體及基因建構物活體內單純皰疹病毒胸苷激酶基因表現影像

In Vivo Gene Expression Imaging by Using Plasmid Vector Containing HSV1-tk Genes

摘要


目的:研究質體載體(plasmid vector)攜帶單純皰疹病毒胸苷激酶(herpes simplex virus thymidine kinase)HSV1-tk基因做為主要的PET報導基因,配合適當的基因傳送試劑將基因送入腫瘤中並予以表現,以獲得活體內的基因表現影像。 方法:利用TE671 medullablastoma腫瘤細胞株於NOD/SCID免疫缺乏的小鼠右肩皮下建立出腫瘤動物模式,分別利用質體載體pORF9/HSV1-tk: sh以及自行建構的基因建構物,搭配DNA轉染試劑將基因送入腫瘤細胞內,藉由施打放射性同位素標幟的基因探針藥物氟-18-FHBG,進行微正子電腦斷層掃描(microPET)方式,獲取基因於活體內腫瘤的表現影像。 結果:除了自Invivogen所購買的質體載體pORF9/HSV1-TK: sh可以成功的在活體內表現進而獲取基因表現的影像外,經由本研究自行組裝架構的基因建構物在活體內及活體外也具有類似的基因表現。DNA轉染方面,本研究成功的利用質體載體搭配轉染試劑將基因送入活體細胞內並予表現。 結論:利用質體載體及基因建構物行基因轉植,可以成功藉由microPET獲取基因表現影像。

並列摘要


Purpose: To investigate plasmid vector containing herpes simplex virus thymidine kinase (HSV1-tk) gene for transfection of tumor for in vivo imaging of gene expression. Methods: TE 671 medullablastoma cells were transplanted subcutaneously on the right shoulder of NOD/SCID mice. Plasmid vectors containing pORF9/HSV1-tk: sh and self-constructed genes were transfected into the tumors by using jetPEI agent. Reporter probe 18F-FHBG was then injected intravenously at 2 days or 3 days after gene transfection. MicroPET imaging was carried out at 2 h and 4 h after injection. Results: Plasmid vector containing pORF9/HSV1-tk: sh (Invivogen) and self-constructed HSV1-tk genes were successfully expressed in vitro as well as in vivo. We proved that plasmid vector mixed with jetPEI is useful for intravenous delivery of gene vectors. Conclusion: The gene delivery system by using plasmid and jetPET may successfully transfect gene into the targeting tumor. The gene expression could be assessed by microPET in vivo.

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