Cusack N J, Hourani S M
Br J Pharmacol. 1981 Jun;73(2):409-12. doi: 10.1111/j.1476-5381.1981.tb10437.x.
1 RP and SP diastereoisomers of adenosine 5'-O-(1-thiodiphosphate) ((R)-ADP-alpha-S and (S)-ADP-alpha-S), an adenosine 5'-diphosphate (ADP) analogue, were tested on intact human platelets. 2 Each diastereoisomer induced aggregation, (S)-ADP-alpha-S being 5 times more potent than (R)-ADP-alpha-S but they achieved only 75% of the maximal effect of ADP. 3 Aggregation induced by each diastereoisomer was competitively inhibited by ATP (50 microM). 4 Simultaneous addition of each diastereoisomer inhibited aggregation induced by ADP but not by 11 alpha, 9 alpha-epoxymethano prostaglandin H2, a stable endoperoxide analogue. Both diastereoisomers are therefore partial agonists at the ADP receptor mediating aggregation. 5 Unlike ADP, neither diastereoisomer inhibited prostaglandin E1 (PGE1)-stimulated adenylate cyclase, but each competitively inhibited the effect of aDP, with (S)-ADP-alpha-S again being 5 times more potent than (R)-ADP-alpha-S. 6 These are the first reported examples of ADP analogues to induce platelet aggregation without inhibiting PGE1-stimulated adenylate cyclase.
对腺苷5'-O-(1-硫代二磷酸)((R)-ADP-α-S和(S)-ADP-α-S)的RP和SP非对映异构体(一种腺苷5'-二磷酸(ADP)类似物)在完整的人血小板上进行了测试。
每种非对映异构体均诱导聚集,(S)-ADP-α-S的效力比(R)-ADP-α-S高5倍,但它们仅达到ADP最大效应的75%。
每种非对映异构体诱导的聚集均受到ATP(50微摩尔)的竞争性抑制。
同时添加每种非对映异构体可抑制ADP诱导的聚集,但不抑制11α,9α-环氧甲撑前列腺素H2(一种稳定的内过氧化物类似物)诱导的聚集。因此,两种非对映异构体在介导聚集的ADP受体上均为部分激动剂。
与ADP不同,两种非对映异构体均不抑制前列腺素E1(PGE1)刺激的腺苷酸环化酶,但每种均竞争性抑制aDP的作用,(S)-ADP-α-S的效力再次比(R)-ADP-α-S高5倍。
这些是首次报道的不抑制PGE1刺激的腺苷酸环化酶而诱导血小板聚集的ADP类似物实例。