Preliminary clinical studies with thromboxane synthase inhibitors and thromboxane receptor blockers. A review.

Abstract:

:This review of the clinical studies of thromboxane synthase inhibitors (TXSIs) and thromboxane receptor blocking drugs (TXRBs) covers the years 1981 to the present. Clinical studies on TXSIs include those in normal volunteers as well as those in patients with angina, peripheral vascular disease and Raynaud's syndrome, pulmonary hypertension, cerebral vasospasm, hepatorenal syndrome, adult respiratory distress syndrome, and those on cardiopulmonary bypass and hemodialysis. The compounds studied include dazoxiben, dazmagrel, CGS 13080, CV 4151, OKY 1581, OKY 046, and U 63557A. In volunteers, single-dose studies have demonstrated inhibition of thromboxane A2 (TXA2) formation, with some small increases in bleeding time but no marked effect on platelet aggregation. In general, the compounds tested were ineffective in both chronic stable angina and vasospastic angina but caused symptomatic improvement in patients with unstable angina. The TXSIs studied were found to produce no consistent effects in any of the other clinical conditions. Since none of the compounds tested produced a sustained inhibition of TXA2 synthesis, the disappointing clinical results with this class of drugs may be due to an incomplete blockade of thromboxane synthase with the dosage regimens used. Possible alternative or additional reasons for the general lack of success with TXSIs could be that some of the diseases studied do not involve TXA2 or that accumulating prostaglandin endoperoxides in the presence of thromboxane synthase inhibition substitute for TXA2 in causing platelet aggregation. TXRBs rely for their efficacy only on blockade of the TXA2 receptor and antagonize the deleterious effects of both TXA2 and prostaglandin H2 equally, so they represent a simpler pharmacological approach than TXSIs. Such drugs include AH 23848, GR 32191, BM 13.177, BM 13.505, and SQ 28668. All of these compounds are inhibitors of platelet aggregation induced by TXA2 or by its stable mimetic, U-46619. AH 23848 was ineffective in patients with stable angina but did benefit patients with peripheral vascular disease. BM 13.177 has also proven effective in preventing restenosis after angioplasty, occlusion of coronary artery bypass grafts, and the deleterious effects of TXA2 in renal disease. From these preliminary studies, it would appear that TXRBs may offer greater clinical potential than TXSIs. Further studies currently underway with TXRBs to resolve this question include those in unstable angina, angioplasty, peripheral vascular disease, renovascular hypertension, and cyclosporine nephrotoxicity.

journal_name

Circulation

journal_title

Circulation

authors

Fiddler GI,Lumley P

subject

Has Abstract

pub_date

1990-01-01 00:00:00

pages

I69-78; discussion I79-80

issue

1 Suppl

eissn

0009-7322

issn

1524-4539

journal_volume

81

pub_type

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