The effect of phosphodiesterase III inhibitors on human neutrophil function

Katsuya Mikawa, Hirohiko Akamatsu, Kahoru Nishina, Makoto Shiga, Nobuhiro Maekawa, Hidefumi Obara, Yukie Niwa

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)


Objectives: Neutrophils play an important role in ridding the body of bacteria and cellular debris. Several neutrophil functions are thought to be regulated by inotropes that increase cellular levels of cyclic adenosine monophosphate, including phosphodiesterase (PDE) inhibitors. We have investigated the effect of amrinone, milrinone, and olprinone, type III PDE (PDE-III) inhibitors, on several human neutrophil functions. Design: Prospective in vitro study. Setting: Academic research laboratory. Subjects: Neutrophils isolated from 12 healthy adult volunteers. Interventions: We measured chemotaxis, phagocytosis, reactive oxygen species production, intracellular calcium ion concentration, and cyclic adenosine monophosphate levels in neutrophils in the absence and the presence (at clinically relevant concentrations, 10 times, and 100 times those concentrations) of amrinone, milrinone, or olprinone. We also measured reactive oxygen species production under the same condition in a xanthine-xanthine oxidase system. Measurements and Main Results: None of the PDE-III inhibitors impaired neutrophil chemotaxis or phagocytosis. Amrinone at clinically relevant or higher concentrations and milrinone at high concentrations reduced superoxide, hydrogen peroxide, and hydroxyl radical levels in neutrophils and in the xanthine-xanthine oxidase system. Olprinone did not have those effects, and none of the PDE-III inhibitors had an effect on intracellular calcium ion concentration or cyclic adenosine monophosphate production in neutrophils stimulated by a chemotactic factor. Conclusions: The ability of amrinone to scavenge reactive oxygen species st clinically relevant concentrations while not affecting neutrophil function suggests that the PDE inhibitor can be used without detriment in severely ill patients.

Original languageEnglish
Pages (from-to)1001-1005
Number of pages5
JournalCritical Care Medicine
Issue number4
Publication statusPublished - 01-01-2000
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Critical Care and Intensive Care Medicine


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