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  • Title: Inhibition by suprofen and other non-narcotic analgesic drugs of the effects of prostaglandin precursor on isolated tissues and platelets.
    Author: Van Nueten JM, Hoebeke J, De Clerck F, Awouters F, Janssen PA.
    Journal: Arch Int Pharmacodyn Ther; 1976 Apr; 220(2):297-310. PubMed ID: 8022.
    Abstract:
    Contractions caused by Slow Reacting Substance C(SRS-C) and by Arachidonic Acid hydroperoxide (AAP) in the guinea-pig ileum and by AAP in the rat fundus were studied in the presence of suprofen and of 3 reference compounds. The dose-related inhibitions were not due to antagonism of prostaglandins. Other agonists of gastrointestinal smooth muscle were not or only weakly antagonized. For the study of selective inhibition of AAP-induced contractions by non-narcotic analgesics, the rat fundus is the preferred preparation. In this model suprofen had an ED50 of 1.27 x 10(-7) M (0.033 mug/ml), being 1.5, 94 and 2, 020 times more potent than indomethacin, phenybutazone and acetylsalicylic acid, respectively. Suprofen also strongly inhibited malondialdehyde formation by guinea-pig platelets incubated with arachidonic acid. The reported effects point to inhibition by suprofen of prostaglandin biosynthesis. The antagonism of AAP-induced contractions in the rat fundus is a valuable test system for inhibitors of prostaglandin biosynthesis.
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