Effect of 6,7-dimethoxy-2,2-dimethyl-2H-chromene (agerarin) on the recovery of filaggrin expression through targeting of Janus kinases in the inflammatory skin   全文下載

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 DNCBapplied skin sections. Moreover, agerarin decreased phosphorylation of JAK1 and JAK2 kinases to enhance FLG expression, which was reduced by TNFaþIFNg and IL4þIL13 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.