Suicide gene therapy with the herpes simplex virus type-1 thymidine kinase gene (HSV-1 tk) is considered to be a promising approach to the treatment of cancer. Making use of the lower specificity of the viral enzyme compared to human thymidine kinase, the therapy involves the administration of antiviral agents (e.g., ganciclovir) as prodrugs to induce enzymatic cell death in those cells that express the transferred gene. 18F-labelled derivatives have been described for monitoring location, duration, and magnitude of the viral kinase enzyme activity by positron emission tomography (PET). Since an optimal radiotracer has not been developed, novel substances were synthesized for monitoring gene expression. A group of 13 nucleoside analogues were synthesized, among them N1-methyl-9-[(1,3-dihydroxy-2-propoxy)methyl]guanine (5) and N1-methyl-9-[(4-hydroxy)-3-hydroxymethylbutyl]guanine (7) as methyl analogues of ganciclovir and penciclovir and their related fluoro compounds (6, 8). Further novel derivatives include N6-methyl-9-[(1,3-dihydroxy-2-propoxy)methyl]-, N6-methyl-9-[(4-hydroxy)-3-hydroxymethylbutyl]adenine (9, 10), as well as the uracil derivatives 5-hydroxy-1-[(1,3-dihydroxy-2-propoxy)methyl]uracil (11), 6-methyl-1-[(1,3-dihydroxy-2-propoxy)-methyl]uracil (12), and its 3-fluoro-derivative (13).Key words: fluorinated nucleoside analogues, gene therapy, PET, thymidine kinase.
自杀基因治疗利用单纯疱疹病毒1型胸腺嘧啶激酶基因(HSV-1 tk)被认为是治疗癌症的一种有前景的方法。该疗法利用病毒酶相对于人类胸腺嘧啶激酶的较低特异性,涉及向表达转移基因的细胞施加抗病毒药物(例如甘昔洛韦)作为前药,诱导这些细胞发生酶促细胞死亡。已经描述了18F标记的衍生物,用于通过正电子发射断层扫描(PET)监测病毒激酶酶活性的位置、持续时间和强度。由于尚未开发出最佳放射性示踪剂,因此合成了新颖的物质用于监测基因表达。合成了一组13个核苷类似物,其中包括N1-甲基-9-[(1,3-二羟基-2-丙氧基)甲基]鸟苷(5)和N1-甲基-9-[(4-羟基)-3-羟甲基丁基]鸟苷(7)作为甘昔洛韦和彭昔洛韦的甲基类似物及其相关的氟化合物(6,8)。进一步的新颖衍生物包括N6-甲基-9-[(1,3-二羟基-2-丙氧基)甲基]-,N6-甲基-9-[(4-羟基)-3-羟甲基丁基]腺嘌呤(9,10),以及尿嘧啶衍生物5-羟基-1-[(1,3-二羟基-2-丙氧基)甲基]尿嘧啶(11),6-甲基-1-[(1,3-二羟基-2-丙氧基)-甲基]尿嘧啶(12)及其3-氟衍生物(13)。关键词:氟化核苷类似物,基因治疗,PET,胸腺嘧啶激酶。