Magnoflorine from Coptis chinese has the potential to treat DNCB-induced Atopic dermatits by inhibiting apoptosis of keratinocyte

AimsIn Sheng Nong’s herbal classic in China, Rhizoma coptidis ^a(RC) could be used to treat Atopic dermatits ^b(AD), but its core ingredient(s) and mechanism remains unknown. The present study aimed to find out the ingredients against AD and expound its mechanisms.Materials and methodsSeven alkaloids were isolated from RC to compare the inhibition against HaCaT cells by MTT assays and apoptosis of cells stimulated with TNF-α/IFN-γ by flow cytometry. The effects of target alkaloids against AD were evaluated on DNCB^c (2,4-dinitrochlorobenzene)-induced atopic dermatitis in mice.Key findingsSeven alkaloids were isolated from RC successfully. The results from MTT and flow cytometry indicated that among these alkaloids, only magnoflorine ^d(MAG) had no obvious toxicity on cells, but could inhibit the apoptosis of the cells stimulated with TNF-α/IFN-γ. Further animal experiments confirmed that MAG significantly attenuated the AD-like symptom and inhibited the AD-induced increases in IgE/IL-4, as compared with control (P < 0.01). Moreover, MAG reduced the low Δψ_m ^e(mitochondrial membrane potential) in HaCaT cells. The results of western blotting proved that MAG inhibited apoptosis of keratinocytes through decreasing the expressions of CTSB^f (cathepsin B), Cyte C^g (cytochrome C), Bid and caspase-3/7/8/9.SignificanceOverall, MAG inhibited apoptosis by decreasing the expression of apoptotic pathway-related proteins, and laid a foundation for the study of AD mechanisms.