Effect of a new thromboxane A2 antagonist, S-145, on platelet aggregation

The newly synthesized compound S-145, (+/-)-5(Z)-7-(3-endo-phenylsulfonylamino 2.2.1] bicyclohept-2-exo-yl)heptenoic acid, inhibited arachidonic acid (AA)-, 9,11-methanoepoxy-PGH2 (U46619)-, collagen- and ADP-induced human platelet aggregation in vitro with IC50 values of 0.25, 0.34, 0.22, and 0.08 microM, respectively. The inhibiting potency of this compound to AA- or U46619-induced platelet aggregation was about twice that of ONO-3708 and 1/7-1/14 that of SQ29,548 in human platelets, about 7 times that of ONO-3708 and 1/3-1/7 that of SQ29,548 in guinea pig platelets, and 250-800 times that of ONO-3708 and 1-7 times that of SQ29,548 in rabbit platelets. When S-145 was administered orally to guinea pigs at the dose of 0.1 mg/kg, AA-induced platelet aggregation was completely inhibited at 30 and 60 min after the administration, but not at 3 and 6 hr. The minimum effective doses of S-145 (p.o.) to AA- and collagen-induced platelet aggregation at 60 min after the administration were 0.01 mg/kg and 0.03 mg/kg, respectively. The potency of S-145 (p.o.) to inhibit AA- and collagen-induced guinea pig platelet aggregation was 30-300 times that of ONO-3708 or SQ29,548 and 300-1000 times that of aspirin. These results suggest that S-145 is a thromboxane A2 antagonist showing a potent inhibiting effect on platelet aggregation by oral administration.