Structure-Activity Relationships for the Ca2+-releasing Activity of 6-Hydroxy-β-carboline Analogues in Skeletal Muscle Sarcoplasmic Reticulum—The Effects of Halogen Substitution at C-5 and C-7
作者:Asami Seino-Umeda、Masami Ishibashi、Jun'Ichi Kobayashi、Yasushi Ohizumi
DOI:10.1211/0022357001774309
日期:2010.2.18
10(-4) M, respectively, indicating that these analogues are 10-200 times more potent than caffeine. Substitution of bromine by chlorine or iodine at the C-5 and C-7 positions markedly reduced the activity of the analogues with a methyl group at the N-9 position. These results suggest that halogens at the C-5 and C-7 positions in the beta-carboline skeleton are essential for Ca2+-releasing activity and that
对6-羟基-β-咔啉类似物的结构-活性关系的研究是在定量测量骨骼肌皮肤纤维的肌浆网中Ca 2+释放活性的基础上进行的。在C-5和C-7位置将卤素取代为氢,然后将甲基进一步引入6-羟基-β-咔啉的N-9位置,导致Ca2 +释放活性。50%有效浓度的5,7-二溴大黄素D,5,7-二氯大黄素D,5,7-二碘大黄素D,9-甲基-5,7-二溴大黄素D,9-甲基-5,7-二氯大黄素D,9 -methyl-5,7-diiodoeudistomin D和咖啡因分别为5.6 x 10(-6),6.3 x 10(-6),7.8 x 10(-6),2.1 x 10(-6),2.0 x 10(- 5),3.7 x 10(-5)和4.7 x 10(-4)M,表明这些类似物的效力比咖啡因强10-200倍。在C-5和C-7位置用氯或碘取代溴显着降低了在N-9位置带有甲基的类似物的活性。这些结果表明,β-咔啉骨架中C-5和C-7位的卤素对于Ca2