Abstract
Platelets from diabetic patients are hypersensitive to aggregating agents. An imbalance in thromboxane/prostacyclin synthesis has been postulated as an antecedent to the development of diabetic retinopathy. We studied 3-month streptozotocin-diabetic rats (SDR) treated with 200 mg/kg/day p.o. of ditazol, an antiplatelet drug that inhibits thromoboxane formation. Thromboxane B2 (TxB2) production was higher and 6-keto-PGF1 alpha synthesis lower in SDR than nondiabetic rats (NDR). In treated animals, ditazol inhibited platelet aggregation by 66%, and TxB2 production by 58%, and increased vascular 6-keto-PGF 1 alpha by 45%. Furthermore, 13% of the retinal surface was covered by peroxidase-labelled vessels in NDR, 2.1% in nontreated SDR, and 8.9% in SDR treated with ditazol. We postulate that ditazol may prevent or reduce diabetic retinopathy.
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