Mutagenicity of Condensed Pyridazines with Different Substituents.
作者:Tamotsu MORITA、Hirotaka NAITOU、Etsuo OISHI
DOI:10.1248/bpb.18.363
日期:——
A total of 24 compounds were prepared by introducing an N-oxide, a hydrazino group, a methoxy group or a chloro group into 3 kinds of condensed pyridazines : pyrido [3, 4-d] pyridazines, pyrido [2, 3-d] pyridazines and phthalazines. The mutagenicity of these 24 compounds was assessed by the Ames method using two tester strains (Salmonella typhimurium TA98 and TA100). No mutagenic activity was detected with any of the 3 condensed pyridazines without substituents or any of the 5 condensed pyridazines with a methoxy group. The compounds with N-oxide in the pyridazine ring showed no or only very weak mutagenicity. However, when an oxide was introduced into the nitrogen of the pyridine ring, the mutagenicity against strain TA98 was higher than that of any other test compound. All compounds with a hydrazino group were mutagenic against strains TA98 and TA100, irrespective of the presence or absence of S9 mix-induced metabolic activation. 1-Hydrazinophthalazine (hydralazine) which has been clinically used as an antihypertensive agent was weakly mutagenic. The introduction of a chloro group increased the bactericidal effects of the condensed pyridazines, thus hampering the assessment of mutagenicity. A majority of the compounds which were found to be mutagenic in this study required no metabolic activation with S9 mix.
通过在3种缩合哒嗪(吡啶并[3,4-d]哒嗪、吡啶并[2,3-d]哒嗪和酞嗪)中引入N-氧化物、肼基、甲氧基或氯基,共制备了24种化合物。使用两种测试菌株(鼠伤寒沙门氏菌TA98和TA100)通过艾姆斯法评估了这24种化合物的致突变性。在3种无取代基的缩合哒嗪和5种带有甲氧基的缩合哒嗪中,未检测到任何一种具有致突变活性。哒嗪环中带有N-氧化物的化合物没有或只有非常弱的致突变性。然而,当氧化物引入吡啶环的氮原子时,对菌株TA98的致突变性高于任何其他测试化合物。所有带有肼基的化合物对菌株TA98和TA100都具有致突变性,无论是否存在S9混合物诱导的代谢激活。1-肼基酞嗪(肼苯哒嗪)在临床上被用作降压药,具有弱致突变性。引入氯基增加了缩合哒嗪的杀菌效果,从而阻碍了