A comparison of the inhibition of growth of methotrexate-resistant and -sensitive leukemia cells in culture by triazines. Evidence for a new mechanism of cell resistance to methotrexate
作者:Cynthia Dias Selassie、Zong Ru Guo、Corwin Hansch、Tasneem A. Khwaja、Stephanie Pentecost
DOI:10.1021/jm00344a013
日期:1982.2
Forty-five 4,6-diamino-1,2-dihydro-2,2-dimethyl-1-(3-X-phenyl)-s-triazine inhibitors of dihydrofolate reductase (DHFR) and methotrexate (MTX) were tested on L5178Y/R murine tumor cell culture. The concentration of inhibitor causing a 50% decrease in growth rate was determined, and from these results a quantitative structure-activity relationship (QSAR) was developed. This QSAR is compared with QSAR
在L5178Y上测试了四氢叶酸还原酶(DHFR)和甲氨蝶呤(MTX)的45种4,6-二氨基-1,2-二氢-2,2-二甲基-1-(3-X-苯基)-s-三嗪抑制剂/ R鼠肿瘤细胞培养。确定引起生长速率降低50%的抑制剂的浓度,并从这些结果确定了定量构效关系(QSAR)。将此QSAR与QSAR进行比较,发现相同抑制剂作用于分离的DHFR和对MTX敏感的L5178Y细胞培养物。结果表明,通过使三嗪具有强疏水性,可以容易地制得非常有效的抗肿瘤细胞生长的三嗪抑制剂。抑制MTX敏感性细胞培养的最佳pi值为0.8,而耐药细胞培养的pi 0约为6.0。比较了对MTX敏感和耐药的肿瘤细胞培养抑制作用的QSAR与对干酪乳杆菌细胞的相应QSAR。哺乳动物和细菌细胞似乎都通过建立亲脂性屏障来保护自己免受高度亲水的MTX的侵害。