Abstract
The two thromboxane A 2 mimetics, carbocyclic thromboxane A 2 (CTA 2) and U-46619 (9,11-methanoepoxy PGH 2) 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 A 2 exerted similar effects to that of the two TxA 2-mimetics. This membrane labilizing action of thromboxanes may be important in propagating the other pathophysiologic effects of thromboxane A 2 in cardiovascular disease states.
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