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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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The effects of siguazodan, a selective phosphodiesterase inhibitor, on human platelet function.

1. The effects of siguazodan (SK&F 94836) a selective phosphodiesterase (PDE) inhibitor with inotropic and vasodilator activity, were studied on human platelets. 2. Siguazodan selectively inhibited the major cyclic AMP-hydrolysing PDE in human platelet supernatants. The inhibited enzyme has been variously termed cyclic GMP-inhibited PDE or PDE-III. 3. In platelet-rich plasma ( PRP), siguazodan inhibited U46619-induced aggregation more potently than that induced by ADP and collagen. Treatment of the PRP with aspirin had no effect on the potency of siguazodan. 4. In washed platelets, siguazodan increased cyclic AMP levels and reduced cytoplasmic free calcium [( Ca2+]i). ADP decreased the ability of siguazodan to raise cyclic AMP and this may explain its lower potency in inhibiting responses to ADP. 5. Siguazodan has anti-platelet actions over the same concentration range that it is an inotrope and vasodilator.[1]

References

  1. The effects of siguazodan, a selective phosphodiesterase inhibitor, on human platelet function. Murray, K.J., England, P.J., Hallam, T.J., Maguire, J., Moores, K., Reeves, M.L., Simpson, A.W., Rink, T.J. Br. J. Pharmacol. (1990) [Pubmed]
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