Topical application of aloperine improves 2,4-dinitrofluorobenzene-induced atopic dermatitis-like skin lesions in NC/Nga mice

Aloperine has been shown to inhibit 2,4-dinitrofluorobenzene (DNFB) induced allergic contact dermatitis in BALB/c mice. In the present study, we further investigated the effect of aloperine on DNFB-induced atopic dermatitis-like skin lesions in NC/Nga mice. NC/Nga mice elicited atopic dermatitis-like skin lesions after the topical application of DNFB. Aloperine treatment significantly inhibited dermatitis index and ear thickness in DNFB-treated NC/Nga mice in a dose-dependent manner. Eosinophils, mast cells infiltration into the ears and plasma level of immunoglobulin (Ig) E were also suppressed by aloperine treatment. Finally, cytokine (interleukin (IL)-1β, IL-4, IL-6, IL-10, IL-13, tumor necrosis factor (TNF)-α and interferon (IFN)-γ) productions in ear biopsies homogenates were significantly elevated after DNFB challenge. Topical application of aloperine increased the immunosuppressive cytokine IL-10 level, while it reduced other cytokines production in a dose-dependent manner. Taken together, these data suggest that aloperine may be one of the effective therapeutic agents for the treatment of atopic dermatitis.