Abstract
Filaggrin (FLG) is a structural component of the stratum corneum that is essential for maintaining the barrier function of the skin and for the formation of natural moisturizing factors. 6,7-Dimethoxy-2,2-dimethyl-2H-chromene (Agerarin) is a bioactive compound derived from Ageratum houstonianum, a plant that is used as a traditional medicine to treat skin diseases. This study aimed to evaluate the effect of agerarin on skin inflammation in a dinitrochlorobenzene (DNCB)-induced atopic dermatitis mouse model. We found that the topical administration of agerarin ameliorates atopic dermatitis-like skin lesions. We also showed that agerarin restores the reduced filaggrin (FLG) expression in DNCB-applied skin sections. Moreover, agerarin decreased phosphorylation of JAK1 and JAK2 kinases to enhance FLG expression, which was reduced by TNFα+IFNγ and IL4+IL13 treatment, in HaCaT keratinocytes. These results demonstrate the feasibility of agerarin as a possible therapeutic against conditions of skin inflammation, such as atopic dermatitis, by improving the upregulation of FLG expression.
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