Study of DNA adducts formed with aromatic hydrocarbons is part of the strategy to elucidate the mechanisms of tumor initiation by these compounds. 1,2,3,4-Tetrahydro-7,12-dimethylbenz[a]anthracene (THDMBA) is of special interest because it allows discrimination between the pathways of bioactivation by one-electron oxidation and monooxygenation. To study and identify adducts formed biologically, synthetic
研究与
芳香烃形成的DNA加合物是阐明这些化合物引发肿瘤的机制的部分策略。1,2,3,4-四氢-
7,12-二甲基苯并[a]蒽(TH
DMBA)具有特殊意义,因为它可以区分单电子氧化和单加氧
生物活化的途径。为了研究和鉴定
生物形成的加合物,需要合成的加合物作为参考标准。在脱氧
腺苷(dA),
腺嘌呤(Ade),脱氧
鸟苷(dG)或脱氧
胞苷(dC)的存在下,将TH
DMBA进行电
化学氧化。在dA存在下,分离出四个加合物:7-甲基-1,2,3,4-四氢
苯并[a]蒽-12-
CH2-N7Ade(7-
MTHBA-12- -N7Ade,3.6%),12 -
MTHBA-7- -N7Ade(4.2%),7-
MTHBA-12- -N6dA(5.8%)和12-异亚甲基-7-
MTHBA-7-N6dA(22.8%); 脱氢产物7 还获得了12-二-exo-亚甲基-THBA(44.2%)。在Ade存在下,合成了9个加合