, Volume 17, Issue 1, pp 25–31 | Cite as

cAMP-specific phosphodiesterase inhibitor, rolipram, reduces eosinophil infiltration evoked by leukotrienes or by histamine in guinea pig conjunctiva

  • Stephen J. Newsholme
  • Lester Schwartz
Original Articles


The effect of rolipram, an isozyme IV-selective inhibitor of cAMP-specific phosphodiesterase, was evaluated in a guinea pig eye model of tissue eosinophilia. (R)-rolipram was administered by gavage to guinea pigs 1 h prior to topical ocular challenge with a mixture of leukotrienes (LTs) (10 ng LTB4 + 1000 ng LTD4/eye) or with histamine dihydrochloride (1 mg/eye). Conjunctivae were evaluated histologically 6 h after challenge. Eosinophil counts per millimeter of conjunctival epithelium in LT-challenged animals that received (R)-rolipram at dosages of 0.1, 0.3, 1, 3, or 10 mg/kg were reduced by 63, 63, 84, 81 and 90% respectively, compared to LT-challenged controls. Reduction was statistically significant (P<0.05) at all dosages. Eosinophil counts per millimeter of epithelium in histamine-challenged animals that received 10 mg/kg (R)-rolipram were reduced by 79% compared to histamine-challenged controls (P<0.01). The results indicate that (R)-rolipram inhibits the response to two distinct classes of mediator in this model of eosinophil infiltration, adding support to the contention that isozyme IV-selective cAMP phosphodiesterase inhibitors offer therapeutic potential for human asthma.


LTB4 Eosinophil Count Rolipram Phosphodiesterase Inhibitor Eosinophil Infiltration 
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Copyright information

© Plenum Publishing Corporation 1993

Authors and Affiliations

  • Stephen J. Newsholme
    • 1
  • Lester Schwartz
    • 1
  1. 1.Department of ToxicologySmithKline Beecham PharmaceuticalsKing of Prussia

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