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- W2742701513 abstract "Dipyridamole is a useful antiplatelet agent in specific clinical conditions, but its effects on TxEL production by platelets are now being debated, Resting platelets from patients with 1.5-2 fig/ml serum dipyridamole (spectrofluorimetric assay). administered by venous infusion or by oral route, showed an increased concentration (m.v. +60% P<0.001) of cAMP (radiometric assay). After stimulation with thrombin (5U/ml) platelets produced a significantly decreased amount of TxB(m.v. -60%, F< 0.001) (radioimmunoassay with antibody kindly supplied by Doctor J.B. Smith, Philadelphia). However also after stimulation with arachidonic acid (A.A.) 1 mM TxB production was decreased(m.v. -50%, P<0.001). The incubation of control platelets with different concentrations of dipyridamole (0.5, 1 and 2 μg/ml) for 20 min at 37°C resulted in an increase of cAMP and in a decrease of TxB, production after stimulation with thrombin and with A.A.. These results indicate that dipyridamole is endowed with direct antiaggrega= ting activity caused by a decreased production of TxB2. This in tum seems due to an inhibitory modulating effect of cAMP on arachidonic acid cyclo-oxygenation. However our findings do not rule out an inhibitory effect also on phospholipase A2." @default.
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- W2742701513 date "1979-01-01" @default.
- W2742701513 modified "2023-09-23" @default.
- W2742701513 title "Modulation by Dipyridamole of the Arachidonic Acid Metabolic Pathway in Platelets an in vivo and in vitro Study" @default.
- W2742701513 doi "https://doi.org/10.1055/s-0039-1684735" @default.
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