A large number of aziridinyl quinones represented by Series 1-9 were studied with respect to their DT-diaphorase substrate activity, DNA reductive alkylation, cytostatic/cytotoxic activity, and in vivo activity. As a result generalizations have been made with respect with respect to the following: DT-diaphorase substrate design, DT-diaphorase-cytotoxicity QSAR, and DNA reductive alkylating agent design. A saturating relationship exists between the substrate specificity for human recombinant DT-diaphorase and the cytotoxicity in the human H
460
non-small-cell lung cancer cell line. The interpretation of this relationship is that reductive activation is no longer rate limiting for substrates with high DT-diaphorase substrate specificities. High DT-diaphorase substrate specificity is not desirable in the indole and cylopent[b]indole systems because of the result is the loss of cancer selectivity along with increased toxicity. We conclude that aziridinyl quinones of this type should possess a substrate specificity (VMAX/KM )<10×10-4 s-1 for DT-diaphorase in order not to be too toxic or nonselective. While some DNA alkylation was required for cytostatic and cytotoxic activity by Series 1-9, too much alkylation results in loss of cancer selectivity as well as increased in vivo toxicity. Indeed, the most lethal compounds are the indole systems with a leaving group in the 3a-position (like the antitumor agent EO-9). We conclude that relatively poor DNA alkylating agents (according to our assay) show the lowest toxicity with the highest antitumor activity.
研究了一系列1-9的大量环
氧丙基
喹喔啉类化合物,对它们的DT-
二氢吡啶酰胺酶底物活性、DNA还原烷基化、细胞增殖/细胞毒性活性和体内活性进行了研究。结果得出了以下结论:DT-
二氢吡啶酰胺酶底物设计、DT-
二氢吡啶酰胺酶-细胞毒性Q
SAR和DNA还原烷基化剂设计。在人
重组DT-
二氢吡啶酰胺酶的底物特异性和人H460非小细胞肺癌细胞株的细胞毒性之间存在饱和关系。这种关系的解释是对于具有高DT-
二氢吡啶酰胺酶底物特异性的底物,还原活化不再是速率限制步骤。对于
吲哚和环戊[b]
吲哚系统,高DT-
二氢吡啶酰胺酶底物特异性并不理想,因为结果是癌症选择性的丧失以及毒性的增加。我们得出结论,这种类型的环
氧丙基
喹喔啉类化合物应该具有DT-
二氢吡啶酰胺酶底物特异性(V
MAX/KM)<10×10-4 s-1,以避免过于毒性或非选择性。虽然一些DNA烷基化是系列1-9的细胞增殖和细胞毒性活性所必需的,但过多的烷基化会导致癌症选择性的丧失以及体内毒性的增加。事实上,最致命的化合物是3a位有离去基团的
吲哚系统(如
抗肿瘤药物
EO-9)。我们得出结论,相对较差的DNA烷基化剂(根据我们的测定)表现出最低的毒性和最高的抗肿瘤活性。