<sup>3</sup>H-labelled alkyl-nucleotides, -nucleosides and -bases for the immunoanalytical quantification of DNA damage and repair
作者:Wolfgang Drosdziok、Catrin Lutze、Kai Krüger、Karl-Heinz Glüsenkamp、Manfred F. Rajewsky
DOI:10.1002/jlcr.721
日期:2003.8
Analysis of the formation and repair of structurally modified DNA is of particular interest in the study of carcinogenesis, cancer therapy and aging. The quantification of specific DNA lesions by sensitive immunoanalytical methods requires radiotracers with high specific activity. We describe the synthesis of 3H-labelled adenine-, cytosine-, guanine- and thymine-alkyl derivatives by nucleophilic N- and O-alkylation using alkyl halides and diazoalkanes: 3-alkyl-[8-3H]adenine (Alkyl = Me, Et, n-Bu); O6-alkyl-deoxy[1′,2′-3H]guanosine (Alkyl = Me, Et, i-Pro, n-Bu); O6-ethyl-deoxyguanosine-5′-triphosphate ([2-3H-Ethyl]; [8-3H]); O6-alkyl-9-hydroxyhexyl-[8-3H] guanine (Alkyl=Me, Et); 7-ethyl-[8,5′-3H]guanosine-3′,5′-cyclic-phosphate; O2-andO4-alkyl-[methyl, 1′,2′-3H]thymidine (Alkyl=Me, Et); the conversion of 3H-labelled thymidine to the corresponding 5-methylcytidine; the synthesis of three different 8-oxo-guanine tracers; and the generation of thymidine glycol (5,6-dihydroxy-5,6-dihydro-[methyl-3H]thymidine) from thymidine. All radiotracers were sucessfully employed in competitive radioimmunoassays for the quantification of defined DNA alkylation products in DNA repair analyses. Copyright © 2003 John Wiley & Sons, Ltd.
结构修饰DNA的形成与修复分析,在癌变、癌症治疗和衰老的研究中具有特殊意义。灵敏的免疫分析法测定特定DNA损伤需要高比活性的放射性示踪剂。我们描述了使用烷基卤和重氮烷通过亲核N-和O-烷基化合成3H标记的腺嘌呤、胞嘧啶、鸟嘌呤和胸腺嘧啶的烷基衍生物:3-烷基-[8-3H]腺嘌呤(烷基=甲基、乙基、正丁基);O6-烷基-脱氧[1′,2′-3H]鸟苷(烷基=甲基、乙基、异丙基、正丁基);O6-乙基-脱氧鸟苷-5′-三磷酸([2-3H-乙基];[8-3H]);O6-烷基-9-羟基己基-[8-3H]鸟嘌呤(烷基=甲基、乙基);7-乙基-[8,5′-3H]鸟苷-3′,5′-环磷酸酯;O2和O4-烷基-[甲基, 1′,2′-3H]胸苷(烷基=甲基、乙基);将3H标记的胸苷转化为相应的5-甲基胞苷;三种不同8-氧代鸟嘌呤示踪剂的合成;以及从胸苷生成胸苷乙二醇(5,6-二羟基-5,6-二氢-[甲基-3H]胸苷)。所有放射性示踪剂均成功用于竞争性放射免疫分析,以量化DNA修复分析中的特定DNA烷基化产物。版权所有 © 2003 John Wiley & Sons, Ltd.