title: Thromboxane induced red blood cell lysis.
abstract: The two thromboxane A2 mimetics, carbocyclic thromboxane A2 (CTA2) and U-46619 (9,11-methanoepoxy PGH2) at concentrations of 400 ng/ml significantly enhanced the release of hemoglobin from both feline and human erythrocyte suspensions. This effect was significantly attenuated by the thromboxane receptor antagonist BM-13,505 indicating that the membrane leakiness is in some way receptor mediated. The effects also appear to be concentration-dependent over the range of 100-400 ng/ml. The membrane labilizing effect of thromboxane analogs is not due to a non-specific eicosanoid effect since iloprost, the stable prostacyclin analog, actually stabilized erythrocyte membranes. Moreover, synthetic thromboxane A2 exerted similar effects to that of the two TxA2-mimetics. This membrane labilizing action of thromboxanes may be important in propagating the other pathophysiologic effects of thromboxane A2 in cardiovascular disease states.
mesh_terms: D019796:15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic Acid; D000818:Animals; D002415:Cats; D006454:Hemoglobins / Q000032:analysis; D006461:Hemolysis / Q000187:drug effects; D006801:Humans; D066298:In Vitro Techniques; D011450:Prostaglandin Endoperoxides, Synthetic / Q000494:pharmacology; D013928:Thromboxane A2 / Q000031:analogs & derivatives / Q000494:pharmacology / Q000502:physiology*
chemical_list: D006454:Hemoglobins; D011450:Prostaglandin Endoperoxides, Synthetic; C024587:thromboxane A2, carbocyclic; D013928:Thromboxane A2; D019796:15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic Acid