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Protein phosphorylation plays critical roles in the regulation of protein activity and cell signaling. The level of protein phosphorylation is controlled by protein kinases and protein tyrosine phosphatases (PTPs). Disturbance of the equilibrium between protein kinase and PTP activities results in abnormal protein phosphorylation, which has been linked to the etiology of several diseases, including cancer. In this study, we screened protein tyrosine phosphatases (PTPs) by in vitro phosphatase assays to identify PTPs that are inhibited by bis (4-trifluoromethyl-sulfonamidophenyl, TFMS)-1,4-diisopropylbenzene (PTP inhibitor IV). PTP inhibitor IV inhibited DUSP14 phosphatase activity. Kinetic studies with PTP inhibitor IV and DUSP14 revealed a competitive inhibition, suggesting that PTP inhibitor IV binds to the catalytic site of DUSP14. PTP inhibitor IV effectively and specifically inhibited DUSP14-mediated dephosphorylation of JNK, a member of the mitogen-activated protein kinase (MAPK) family.
Protein phosphorylation plays critical roles in many regulatory mechanisms controlling cell activities and thus involved in various diseases. The cellular equilibrium of phosphorylation is regulated through the actions of protein kinases and phosphatases. Therefore, these regulatory proteins have emerged as promising targets for drug development. In this study, we screened protein tyrosine phosphatases (PTPs) by in vitro phosphatase assays to identify PTPs that are inhibited by 8-hydroxy-7-(6-sulfonaphthalen-2-yl)diazenyl-quinoline-5-sulfonic acid (NSC-87877), a potent inhibitor of SHP-1 and SHP-2 PTPs. Phosphatase activity of dual-specificity protein phosphatase 26 (DUSP26) was decreased by the inhibitor in a dose-dependent manner. Kinetic studies with NSC-87877 and DUSP26 revealed a competitive inhibition. NSC-87877 effectively inhibited DUSP26-mediated dephosphorylation of p38, a member of mitogen-activated protein kinase (MAPK) family. Since DUSP26 is involved in survival of anaplastic thyroid cancer (ATC) cells, NSC-87877 could be a therapeutic reagent for treating ATC.
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