US EPA

3001618 

Journal Article 

Effects of Dictamnus dasycarpus Turcz., root bark on ICAM-1 expression and chemokine productions in vivo and vitro study 

Han, HY; Ryu, MH; Lee, G; Cheon, WJ; Lee, C; An, WG; Kim, H; Cho, SI 

2015 

Yes 

Journal of Ethnopharmacology
ISSN: 0378-8741 

159 

245-252 

English 

25449455 

10.1016/j.jep.2014.11.020 

ETHNOPHARMACOLOGICAL RELEVANCE: The root bark of Dictamnus dasycarpus Turcz., family Rutaceae is a well known anti-inflammatory agent for skin diseases such as eczema, pruritus and urticaria in Eastern countries.

MATERIALS AND METHODS: We investigated the effects of methanol extract of Dictamnus dasycarpus root bark (MEDD) on Intercellular Adhesion Molecule-1 (ICAM-1) expression, epidermal hyperplasia and immune cell infiltration in 1-fluoro-2,4-dinitrofluorobenzene (DNFB)-induced contact dermatitis (CD) mice. We also investigated its effects on the expression of ICAM-1, binding capacity to THP-1 cells, cytokine and chemokine production, and phosphorylation of NF-κB in human keratinocytes (HaCaT cells).

RESULTS: Topical application of MEDD effectively inhibited ICAM-1 expression and epidermal hyperplasia in inflamed tissues. MEDD treatment also inhibited immune cell infiltration induced by DNFB. In addition, treatment with MEDD reduced surface expression and total amount of ICAM-1in HaCaT cells and effectively lowered the capacity to bind to THP-1 cells. MEDD also lowered the levels of IL-6, IL-8, monokine induced by gamma interferon (MIG), monocyte chemotactic protein-1 (MCP-1) and regulated on activation, normal T cell expressed and secreted (RANTES). Finally, MEDD treatment prevented activation of the NF-κB pathway induced by TNF-α in HaCaT cells.

CONCLUSIONS: These data indicate that root bark of Dictamnus dasycarpus has the potential for treatment of inflammatory skin diseases as a complementary or alternative medicine to corticosteroids. In addition, they suggest that the anti-inflammatory effects of Dictamnus dasycarpus on CD are involved in the regulation of ICAM-1 expression and cytokine and chemokine secretion through down-regulation of the NF-κB signaling pathway in keratinocytes. 

Chinese medicine; Contact dermatitis; Dictamnus dasycarpus; Inflammation; Traditional