title: NSC-87877, inhibitor of SHP-1/2 PTPs, inhibits dual-specificity phosphatase 26 (DUSP26).
abstract: 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.
authors.affiliation: Chung-Ang University, Dongjak-Gu, Heuk-suk Dong, Seoul, Republic of Korea.
authors.forename: Mina
authors.initials: M
authors.lastname: Song
authors.forename: Jae Eun
authors.initials: JE
authors.lastname: Park
authors.forename: Sung Goo
authors.initials: SG
authors.lastname: Park
authors.forename: Do Hee
authors.initials: DH
authors.lastname: Lee
authors.forename: Hyung-Kyoon
authors.initials: HK
authors.lastname: Choi
authors.forename: Byoung Chul
authors.initials: BC
authors.lastname: Park
authors.forename: Seong Eon
authors.initials: SE
authors.lastname: Ryu
authors.forename: Jae Hoon
authors.initials: JH
authors.lastname: Kim
authors.forename: Sayeon
authors.initials: S
authors.lastname: Cho
mesh_terms: D002460:Cell Line; D054637:Dual-Specificity Phosphatases / Q000037:antagonists & inhibitors*; D004791:Enzyme Inhibitors / Q000737:chemistry / Q000494:pharmacology*; D006801:Humans; D054639:Mitogen-Activated Protein Kinase Phosphatases / Q000037:antagonists & inhibitors*; D054592:Protein Tyrosine Phosphatase, Non-Receptor Type 11 / Q000037:antagonists & inhibitors; D053824:Protein Tyrosine Phosphatase, Non-Receptor Type 6 / Q000037:antagonists & inhibitors; D011804:Quinolines / Q000737:chemistry / Q000494:pharmacology*
chemical_list: D004791:Enzyme Inhibitors; C512715:NSC-87877; D011804:Quinolines; D054639:Mitogen-Activated Protein Kinase Phosphatases; C500883:DUSP26 protein, human; D054637:Dual-Specificity Phosphatases; D054592:Protein Tyrosine Phosphatase, Non-Receptor Type 11; D053824:Protein Tyrosine Phosphatase, Non-Receptor Type 6