Hamid S, Whittle B J
Br J Pharmacol. 1985 May;85(1):285-90. doi: 10.1111/j.1476-5381.1985.tb08858.x.
The anti-aggregating actions of prostaglandin D2 (PGD2) have been compared to prostacyclin (PGI2), its stable analogue carbacyclin and a hydantoin prostaglandin, BW245C, in guinea-pig PGI2, carbacyclin and BW245C were potent inhibitors of ADP-induced aggregation in guinea-pig platelets, with ID50 values comparable to those obtained in human platelet-rich-plasma. In contrast, PGD2 acted as a weak and partial inhibitor in guinea-pig platelet aggregation, producing a bell-shaped dose-response relationship. PGD2 induced a dose-related antagonism of the inhibitory actions of BW245C, prostacyclin and carbacyclin on guinea-pig platelets. However, PGD2 did not antagonize the inhibitory actions of either forskolin or dibutyryl cyclic AMP on this platelet preparation. The results suggest a non-specific interaction of PGD2 with these prostanoid binding sites on guinea-pig platelets.
已将前列腺素D2(PGD2)的抗聚集作用与前列环素(PGI2)、其稳定类似物卡前列环素以及一种乙内酰脲前列腺素BW245C进行了比较。在豚鼠中,PGI2、卡前列环素和BW245C是ADP诱导的豚鼠血小板聚集的有效抑制剂,其半数抑制浓度(ID50)值与在富含血小板的人血浆中获得的值相当。相比之下,PGD2在豚鼠血小板聚集中起弱的部分抑制剂作用,产生钟形剂量反应关系。PGD2诱导了BW245C、前列环素和卡前列环素对豚鼠血小板抑制作用的剂量相关拮抗作用。然而,PGD2并不拮抗福斯可林或二丁酰环磷腺苷对该血小板制剂的抑制作用。结果表明PGD2与豚鼠血小板上的这些前列腺素结合位点存在非特异性相互作用。