Abstract
We investigated the synergetic effects of glucocorticoid and histamine H1 receptor antagonists on an atopic dermatitis model. Hairless mice were used in this study and an atopic dermatitis model was made by repeated application of 2,4,6-trinitrochlorobenzene. The effects of glucocorticoid, histamine H1 receptor antagonists, and the simultaneous use of these drugs were investigated by measuring scratching behavior, skin symptoms and nerve growth factor (NGF) in the skin. Topical application of prednisolone significantly inhibited scratching behavior, skin symptoms and NGF contents in the skin by repeated application. Olopatadine also showed a significant effect on scratching behavior and NGF contents in the skin, whereas chlorpheniramine showed no significant inhibitory effect on these indices. Furthermore, the combined use of prednisolone and olopatadine potentiated the inhibition of scratching behavior, skin symptoms, and NGF in the skin. From these findings, olopatadine potentiated the inhibitory effect of prednisolone on the symptoms of atopic dermatitis by inhibiting NGF.
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