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The aim of this study was to examine inhibitory effects of pine needle ethanol extracts (PNEE) on atopic dermatitis (AD). To determine inflammatory activity PNEE was added to LPS-induced murine peritoneal macrophages for an in-vitro test. In addition, anti-AD test was carried out by spreading PNEE on the dorsal skin of 2,4-dinitrochlorobenzene (DNCB)- induced BALB/c mice. It was confirmed that the nitric oxide (NO) secretion was suppressed when 1~50 μg/mL of PNEE were added to LPS-induced murine peritoneal macrophages. Moreover, levels of TNF-α, IL-6, and IL-1β? were decreased. For the anti-AD test, PNEE alleviated symptoms of the erythema in DNCB-induced mice. Furthermore, the IFN-γ secretion of the group treated with PNEE was increased in splenocytes from DNCB-induced mice compared to the positive control, while IL-4 secretion diminished. Through these results, we can conclude that PNEE can inhibit AD by modulating the IFN-γ, IL-4 cytokines production and inhibiting inflammation.

Effect of Pine needle Ethanol Extracts on the Inhibitory Activity of Atopic Dermatitis