Abstract
Anthraquinones have been reported as phosphatase inhibitors. Therefore, anthraquinone derivatives were screened to identify a potent phosphatase inhibitor against the phosphatase of regenerating liver-3 (PRL-3). Emodin strongly inhibited phosphatase activity of PRL-3 with IC(50) values of 3.5μM and blocked PRL-3-induced tumor cell migration and invasion in a dose-dependent manner. Emodin rescued the phosphorylation of ezrin, which is a known PRL-3 substrate. The results of this study reveal that emodin is a PRL-3 inhibitor and a good lead molecule for obtaining a selective PRL-3 inhibitor.
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