Abstract
The purpose of this study was to investigate the effect of the phosphodiesterase (PDE) type 3 inhibitor milrinone on the adhesion of platelets to monocytes in vitro. Prospective study. University experimental laboratory. Ten healthy volunteers. Whole blood was incubated with 1, 10, or 100 micromol/L of milrinone. After stimulation with N-formyl-methionyl-leucyl-phenylalanine (FMLP) or adenosine-5-diphosphate (ADP), platelet-monocyte adhesion and CD11b, PSGL-1, GPIIb/IIIa, and P-selectin expression were measured by flow cytometry. The formation of platelet-monocyte conjugates after PDE3 inhibition depended on the type of stimulation. In unstimulated and FMLP-stimulated blood platelet monocytes, aggregation was enhanced by increasing concentrations of milrinone. This augmentation was accompanied by a rise in P-selectin expression in platelets. In ADP-stimulated blood the number of platelet-monocyte aggregates decreased with increasing concentrations of milrinone. Concurrent with the reported antiinflammatory properties of PDE-inhibition, an inhibition of CD11b expression was found in monocytes after stimulation with FMLP. In contrast, in unstimulated samples lower concentrations of milrinone caused an increase in CD11b. These fin...Continue Reading
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