带HSV－tk基因的重组腺病毒杀伤离体肺癌细胞的研究

Killer effect of recombinant adenovirus with HSV-tk on human lung adenoma cells in vitro

带有单纯疱疹病毒脱氧胸苷激酶基因（ＨＳＶ－ｔｋ）的腺病毒结合ｇａｎｃｉｃｌｏｖｉｒ（ＧＣＶ）对分裂细胞有很强的杀伤作用．在感染复数（Ｍ．Ｏ．Ｉ，ＭｕｌｔｉＰｌｉｃｉｔｙｏｆＩｎｆｅｃｔｉｏｎ）达到１０００时对人体肺腺癌细胞Ａ５４９的杀伤几乎达到１００％．四种人体肺癌细胞株（Ａ５４９，ＬＡＸ，ＳＰＣ，ＳＫＹ）对带ＨＳＶ－ｔｋ的腺病毒（ＡＤＶ／ＲＳＶ－ｔｋ）的杀伤作用表现出不同的敏感性．另Ａｃｙｃｌｏｖｉｒ（ＡＣＶ）和ＧＣＶ对感染了重组腺病毒ＡＤＶ／ＲＳＶ－ｔｋ的细胞都有一定杀伤作用，但杀伤效果有很大差别；就Ａ５４９而言，ＧＣＶ的杀伤作用比ＡＣＶ高７～８倍．此外ＡＤＶ／ＲＳＶ－ｔｋ结合ＧＣＶ杀伤肿瘤细胞时有“旁观者效应”，即感染了ＡＤＶ／ＲＳＶ－ｔｋ的细胞与未感染细胞混合后，后者也明显地遭到杀伤．

The killer effect of adenovirus-mediated HSV-tk gene and ganciclovir(GCV)system on human lung adenoma cells was reported in this paper. Recombinant adenovirus with M. O. I (Multiplicity of Infection) of 1000 resulted in almost 100% A549 cells (human lung adenoma cell) death. By comparing the killer effect on different human lung cancer cells (A549, LAX, SPC and SKY), it was found that different transduced cell lines have different susceptibillty. The transduced cells were susceptible to both GCV and ACV but in different extent. The killer effect of GCV on A549 cells is 7to 8-fold stronger than that of ACV. There was also a 'bystander effect' when ADV/RSV-tk and GCV system took effect. It means that the untransduced cells are killed when mixed with transduced cells.