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  • Title: Rhein protects against barrier disruption and inhibits inflammation in intestinal epithelial cells.
    Author: Zhuang S, Zhong J, Zhou Q, Zhong Y, Liu P, Liu Z.
    Journal: Int Immunopharmacol; 2019 Jun; 71():321-327. PubMed ID: 30952096.
    Abstract:
    BACKGROUND AND AIMS: Intestinal epithelial barrier and intestinal inflammation play indispensable roles in the development of intestinal diseases. The major aims of the current study were to investigate the potential of rhein, a major flavonoid compound isolated from Rheum rhabarbarum, in the treatment of intestinal diseases and its underlying mechanisms in vitro. METHODS: The protective role of rhein on intestinal epithelial barrier was evaluated in a monolayer of IEC-6 cells stimulated by TNF-α, while the anti-inflammatory effects were investigated in an IEC-6 cell model with LPS stimulation. RESULTS: Rhein inhibited the increase of phenol red flux and the decrease of TEER, as well as recovered the expression and distribution of ZO-1 and weakened MLC phosphorylation, MLCK expression and NF-κB activation. Meanwhile, LPS-stimulated IL-1β and IL-6 were down-regulated, expression levels of TLR4, NLRP3 and cleaved caspase1 were weakened and NF-κB was inactivated. CONCLUSIONS: These results suggested that rhein has potential therapeutic effects against intestinal diseases by maintaining intestinal epithelial barrier and suppressing intestinal inflammation.
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