Platelet anti-aggregant activity of 2,2-dimethylthiazolidine hydrochloride and 2-(4-hydroxy-3-methoxyphenyl)thiazolidine.
作者:TSUTOMU MIMURA、YASUHIRO KOHAMA、SHIGEKI KUWAHARA、KOHJI YAMAMOTO、YUTAKA KOMIYAMA、MIKIO SATAKE、YOSHIYUKI CHIBA、KAZUYUKI MIYASHITA、TETSUAKI TANAKA、TAKESHI IMANISHI、CHUZO IWATA
DOI:10.1248/cpb.36.1110
日期:——
The characteristics of platelet anti-aggregant activity of 2, 2-dimethylthiazolidine hydrochloride (I) and 2-(4-hydroxy-3-methoxyphenyl)thiazolidin (II) have been evaluated. Compounds I and II were potent inhibitors of collagen- and arachidonic acid-induced aggregation of rat and rabbit platelets (IC50 or IC100 values : 10-5-10-4 M), while they were less effective in the cases of adenosine 5'-diphosphate 2Na, A-23187 and labile aggregation-stimulating substance. Also, both compounds inhibited platelet shape change induced by a low concentation of arachidonic acid. Compounds I (100μM) and II (25μM) significantly inhibited serotonin release and thromboxane B2 formation induced by arachidonic acid in rabbit platelets. Compound I (100μM) inhibited prostaglandin I2 formation in rat aorta, but II (100μM) did not. In contrast, neither compound had any effect on platelet adhesiveness. These results strongly suggest that I and II prevented platelet aggregation, shape change and serotonin release reaction via their inhibitory effects on arachidonic acid metabolism of platelets, and the inhibiting potency of II was higher than that of I.
对 2,2-二甲基噻唑烷盐酸盐(I)和 2-(4-羟基-3-甲氧基苯基)噻唑烷(II)的血小板抗聚集活性特征进行了评估。化合物 I 和 II 是胶原蛋白和花生四烯酸诱导的大鼠和兔血小板聚集的强效抑制剂(IC50 或 IC100 值:10-5-10-4 M),而对 5'-二磷酸腺苷 2Na、A-23187 和易变聚集刺激物质的抑制效果较差。此外,两种化合物都能抑制低浓度花生四烯酸引起的血小板形状变化。化合物 I(100μM)和 II(25μM)可明显抑制花生四烯酸诱导的兔血小板中血清素的释放和血栓素 B2 的形成。化合物 I(100μM)可抑制大鼠主动脉中前列腺素 I2 的形成,但 II(100μM)却没有抑制作用。相反,这两种化合物对血小板的粘附性都没有影响。这些结果有力地表明,I 和 II 是通过抑制血小板的花生四烯酸代谢作用来阻止血小板聚集、形状改变和血清素释放反应的,而且 II 的抑制效力高于 I。