There is a striking congruence between the inhibitory effects of three synthetic entities on ADP-induced (i) human blood platelet aggregation and (ii) platelet factor 3 availability as evidenced by prolonged 'Stypven time'. The pronounced parallel between each compound's potency in inhibiting aggregation (e.g. IA 48.9 +/- 1.3, S.E., %; n = 16) and in impeding platelet factor 3 availability (e.g. IPF-3av 42.3 +/- 2.5, S.E., %; n = 12), determined concurrently in platelet-rich plasma of four different donors, further substantiates that the antiplatelet activity of our carbamoylpiperidine and nipecotoylpiperazine congeners is exerted through their interaction with anionic phospholipids.
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