Ternary oxovanadium(IV) complexes of ONO-donor Schiff base and polypyridyl derivatives as protein tyrosine phosphatase inhibitors: synthesis, characterization, and biological activities |
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Authors: | Caixia Yuan Liping Lu Xiaoli Gao Yanbo Wu Maolin Guo Ying Li Xueqi Fu Miaoli Zhu |
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Affiliation: | (1) Institute of Molecular Science, The Key Laboratory of Chemical Biology and Molecular Engineering of Education Ministry, Shanxi University, 92 Wucheng Road, 030006 Taiyuan, China;(2) Department of Chemistry and Biochemistry, University of Massachusetts Dartmouth, Dartmouth, MA 02747, USA;(3) Edmond H. Fischer Signal Transduction Laboratory, College of Life Sciences, Jilin University, 130023 Changchun, China;(4) State Key Laboratory of Coordination Chemistry, Nanjing University, 210093 Nanjing, China; |
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Abstract: | Abstract A series of oxovanadium complexes with mixed ligands, a tridentate ONO-donor Schiff base ligand [viz., salicylidene anthranilic acid (SAA)], and a bidentate NN ligand [viz., 2,2′-bipyridine (bpy), 1,10-phenanthroline (phen), dipyrido[3,2-d:2′,3′-f]quinoxaline (dpq), dipyrido[3,2-a:2′,3′-c]phenazine (dppz), or 7-methyldipyrido[3,2-a:2′,3′-c]phenazine (dppm)], have been synthesized and characterized by elemental analysis, electrospray ionization mass spectrometry, UV–vis spectroscopy, Fourier transform IR spectroscopy, EPR spectroscopy, and X-ray crystallography. Crystal structures of both complexes, [VIVO(SAA)(bpy)]·0.25bpy and [VIVO(SAA)(phen)]·0.33H2O, reveal that oxovanadium(IV) is coordinated with one nitrogen and two oxygen atoms from the Schiff base and two nitrogen atoms from the bidentate planar ligands, in a distorted octahedral geometry (VO3N3). The oxidation state of V(IV) with d 1 configuration was confirmed by EPR spectroscopy. The speciation of VO–SAA–bpy in aqueous solution was investigated by potentiomtreic pH titrations, and the results revealed that the main species are two ternary complexes at a pH range of 7.0–7.4, and one is the isolated crystalline complex. The complexes have been found to be potent inhibitors against human protein tyrosine phosphatase 1B (PTP1B) (IC50 approximately 30–61 nM), T-cell protein tyrosine phosphatase (TCPTP), and Src homology phosphatase 1 (SHP-1) in vitro. Interestingly, the [VIVO(SAA)(bpy)] complex selectively inhibits PTP1B over the other two phosphatases (approximate ninefold selectivity against SHP-1 and about twofold selectivity against TCPTP). Kinetics assays suggest that the complexes inhibit PTP1B in a competitive and reversible manner. These suggest that the complexes may be promising candidates as novel antidiabetic agents. Graphical Abstract Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. |
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Keywords: | Oxovanadium(IV) complexes Protein tyrosine phosphatase 1B Src homology phosphatase 1 T-cell protein tyrosine phosphatase Phosphatase inhibitor |
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