PMID: 9163638May 1, 1997Paper

Inhibition of PAF-induced expression of CD11b and shedding of L-selectin on human neutrophils and eosinophils by the type IV selective PDE inhibitor, rolipram

The European Respiratory Journal
C BerendsH F Kauffman

Abstract

We quantitatively determined whether the selective phosphodiesterase (PDE) inhibitor, rolipram, inhibits changes in the adhesion molecules CD11b and L-selectin on platelet-activating factor (PAF)-stimulated human neutrophils and eosinophils in vitro. Incubations were performed in human whole blood obtained from healthy volunteers, to restrict activation by purification procedures and to simulate in vivo conditions, in which different cell types may interact, more closely. Receptor expression was measured after fixation of cells, using monoclonal antibodies and flow cytometry. Concentration-dependent inhibition of the PAF-induced CD11b expression and L-selectin shedding for neutrophils and eosinophils was observed with rolipram, dibutyryl cyclic adenosine monophosphate (cAMP), prostaglandin E2 (PGE2), and isoproterenol. However, these inhibitions did not exceed 50%. Preincubation with rolipram (10(-8) M) and subsequent incubation with isoproterenol (0.5x10(-8) M) or PGE2 (10(-8) M) induced a cumulative, but not synergistic, effect. Using the combination of rolipram with isoproterenol or PGE2, inhibition of PAF-induced L-selectin shedding from eosinophils was as high as 71+/-28 and 67+/-21%, respectively. Other inhibitions were b...Continue Reading

Citations

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