Abstract
Atopic dermatitis (AD) is a chronic inflammatory skin disease characterized by severe itch. This study was designed to evaluate the therapeutic effects of oral administration of Bifidobacterium longum, KACC 91563 (BLK) on 2, 4-dinitrochlorobenzene (DNCB) - induced AD-like skin lesions in NC / Nga mice. Three doses of BLK (333, 1667, and 3334 mg / kg / day, 7 times a week) were orally administrated to mice with DNCB-induced AD. The therapeutic effect of BLK was assessed by measuring skin AD score, scratching behavior, serum IgE levels, as well as the expression of COX-2, TNF-α, IL-4, IL-10, and IL-12 by immunohistochemistry. AD score, scratching frequency, serum IgE level, COX-2, TNF-α, IL-4, IL-10, and IL-12 increased in mice with DNCB-induced AD. BLK alleviated AD-like symptoms such as skin severity of AD score and scratching behaviors. In addition, BLK reduced IgE, COX-2, and TNF-α, IL-4, IL-10, and IL-12 expression. These results suggest that oral administration of BLK has beneficial therapeutic effects for AD patients.
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