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COMPARATIVE STUDY
JOURNAL ARTICLE
Effect of orally administered rolipram, a phosphodiesterase 4 inhibitor, on a mouse model of the dermatitis caused by 2,4,6-trinitro-1-chlorobenzene (TNCB)-repeated application.
European Journal of Pharmacology 2006 Februrary 18
The purpose of this study was to evaluate the efficacy of rolipram, a phosphodiesterase (PDE) 4 inhibitor, in a mouse model of dermatitis induced by repeated application of 2,4,6-trinitro-1-chlorobenzene (TNCB). BALB/c mice were sensitized with 0.3% w/v TNCB applied to the ear on day -7, followed by application three times a week from day 0. Rolipram, prednisolone and cyclosporine A were administered orally once daily from day 0 to 21. Rolipram at a dose of 10 mg/kg/day significantly inhibited the ear thickness and the increase in cytokine levels and enzyme activity in the ear. Interleukin (IL)-4 production was markedly decreased in cervical lymph node cells from animals treated with rolipram at a dose of 10 mg/kg/day. Prednisolone and cyclosporine A significantly reduced ear thickness. These compounds significantly decreased the total cell and lymphocyte number of the cervical lymph nodes. Furthermore, prednisolone markedly suppressed body weight gain, and cyclosporine A significantly increased the serum total IgE concentration compared with that in the vehicle-treated control. Rolipram, unlike prednisolone and cyclosporine A, did not influence body weight and the total IgE concentration in the serum. The present results suggest that the PDE4 inhibitor is a promising oral medicine for the treatment of chronic skin inflammatory diseases.
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