Thirteen structural analogs of leukotrienes C and D were prepared and tested for contractile activities on guinea pig pulmonary parenchymal strips. The analogs differed from the native structures in the peptide moiety, the 5-hydroxyl group, the carboxyl group and in the number and geometry of ethylenic bonds. Deamino analogs of leukotriene C4 (LTC4) and leukotriene D4 (LTD4) retained substantial contractile activities. Amide analogs of LTD4 and 5-O-methyl-LTC4 showed some activity. Modification of the peptide moiety caused a 1-3 orders of magnitude decrement. Analogs in which the various ethylenic bonds were saturated retained substantial contractile activity. However, perhydro LTD had no contractile activity.
合成了13种
白三烯C和D的结构类似物,并测试了它们在豚鼠肺实质条上的收缩活性。这些类似物在肽部分、5-羟基、羧基以及
乙烯键的数量和几何形状上与原有结构有所不同。去
氨基
白三烯C4(LTC4)和
白三烯D4(LT
D4)的类似物保留了显著的收缩活性。LT
D4的
酰胺类似物和5-O-
甲基-LTC4显示出一定的活性。对肽部分的改造导致活性的降低达到1-3个数量级。各种
乙烯键被饱和后得到的类似物则保留了显著的收缩活性。然而,全
氢化LTD完全没有收缩活性。