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Background: Atopic Dermatitis (AD) is a chronic inflammatory skin disease that causes functional disruption of the skin barrier. We previously found that ethanol Extracts of Mallotus Philippinensis Bark (EMPB) promoted migration of mesenchymal stem cells and improved wound healing probably through anti-inflammatory action. However, direct evidence of the anti-inflammatory effect of EMPB and the underlying mechanisms of this action remain unknown. In the present study, we evaluated whether EMPB has an effective action on anti-inflammation using an in vitro and in vivo model. We found that topical application of EMPB improved house dust miteinduced AD-like skin inflammation in NC/Nga mice. In addition, EMPB significantly inhibited various kinds of inflammatory mediators such as interleukin-1ß, inducible nitric oxide synthases, and nuclear factorkappa B in lipopolysaccharide-stimulated macrophage cells. Moreover, EMPB exhibited marked radical scavenging ability. Taken together, these results suggest that EMPB may be useful in the treatment of skin inflammatory diseases such as AD.
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Asayama et al. (2020) studied this question.
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