title: Benzoquinones from Ardisia japonica with inhibitory activity towards human protein tyrosine phosphatase 1B (PTP1B).
abstract: From the whole plant of Ardisia japonica, four [1,4]benzoquinones were isolated by means of bioassay-directed fractionation of the EtOH extract. Apart from the two known compounds maesanin (1) and its congener 2, two new benzoquinones, i.e., 5-ethoxy-2-hydroxy-3-[(10Z)-pentadec-10-en-1-yl][1,4]benzoquinone (3) and 5-ethoxy-2-hydroxy-3-[(8Z)-tridec-8-en-1-yl][1,4]benzoquinone (4), were identified. All compounds showed significant in vitro bioactivities against the PTP1B enzyme, with IC50 values in the range of ca. 3-19 microM.
authors.affiliation: Shanghai Research Center for Modernization of Traditional Chinese Medicine, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, PR China.
authors.forename: Yan-Fang
authors.initials: YF
authors.lastname: Li
authors.forename: Jia
authors.initials: J
authors.lastname: Li
authors.forename: Qiang
authors.initials: Q
authors.lastname: Shen
authors.forename: Li-Hong
authors.initials: LH
authors.lastname: Hu
mesh_terms: D031644:Ardisia / Q000737:chemistry*; D016227:Benzoquinones / Q000302:isolation & purification / Q000494:pharmacology*; D004791:Enzyme Inhibitors / Q000302:isolation & purification / Q000494:pharmacology*; D000431:Ethanol / Q000737:chemistry; D006801:Humans; D020128:Inhibitory Concentration 50; D054562:Protein Tyrosine Phosphatase, Non-Receptor Type 1; D017027:Protein Tyrosine Phosphatases / Q000037:antagonists & inhibitors*
chemical_list: D016227:Benzoquinones; D004791:Enzyme Inhibitors; D000431:Ethanol; C516607:PTPN1 protein, human; D054562:Protein Tyrosine Phosphatase, Non-Receptor Type 1; D017027:Protein Tyrosine Phosphatases