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  • Title: Platelet involvement in the nephritis of acute serum sickness in rabbits: protection by dipyridamole and FUT-175.
    Author: Koyama A, Inage H, Sano M, Narita M, Tojo S, Neild GH, Cameron JS.
    Journal: Clin Exp Immunol; 1985 Aug; 61(2):388-96. PubMed ID: 4042428.
    Abstract:
    In the acute serum sickness model in rabbits, we investigated platelet release of 5-HT, platelet surface immunoglobulins, and platelet aggregation in response to ADP, together with the effect of dipyridamole and the Clr antagonist FUT-175. The immune release of 5-HT from platelets occurred between 4 and 6 days after injection of bovine serum albumin (BSA), before immune elimination and proteinuria, but coincident with the appearance of immune complexed BSA in the circulation. Nevertheless, platelet turnovers were not detectably accelerated. Treatment with dipyridamole 50 mg/kg/24 h prevented the release of 5-HT and inhibited proteinuria, glomerular hypercellularity and immune complexes in the glomeruli. Using the Clr antagonist FUT-175, similar abrogation of the disease was obtained. We conclude that in the nephritis of acute serum sickness in rabbits, some of the immune release from platelets may be the result of immune complex binding to the platelet, perhaps through the receptor for C3b.
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