Fifteen novel sulfathiazole-related compounds were designed as PTP1B inhibitors based on a previously reported allosteric inhibitor (1) of PTP1B. These compounds were synthesized and evaluated against human recombinant PTP1B. Six compounds (3, 4, 8 and 14-16) exhibited significant inhibitory activity against PTP1B. The most active compound (16) showed IC50 value of 3.2 mu M and kinetic analysis indicated that it is a non-competitive inhibitor of PTP1B. Furthermore, compound 16 demonstrated excellent selectivity to PTP1B over other PTPs. It also displayed in vivo insulin sensitizing effect in the insulin resistant mice. (C) 2013 Elsevier Ltd. All rights reserved.
Synthetic molecules for disruption of the MYC protein-protein interface
作者:Nicholas T. Jacob、Pedro O. Miranda、Ryan J. Shirey、Ritika Gautam、Bin Zhou、M. Elena de Orbe Izquierdo、Mark S. Hixon、Jonathan R. Hart、Lynn Ueno、Peter K. Vogt、Kim D. Janda
DOI:10.1016/j.bmc.2018.07.019
日期:2018.8
MYC is a key transcriptional regulator involved in cellular proliferation and has established roles in transcriptional elongation and initiation, microRNA regulation, apoptosis, and pluripotency. Despite this prevalence, functional chemical probes of MYC function at the protein level have been limited. Previously, we discovered 5a, that binds to MYC with potency and specificity, downregulates the transcriptional activities of MYC and shows efficacy in vivo. However, this scaffold posed intrinsic pharmacokinetic liabilities, namely, poor solubility that precluded biophysical interrogation. Here, we developed a screening platform based on field-effect transistor analysis (Bio-FET), surface plasmon resonance (SPR), and a microtumor formation assay to analyze a series of new compounds aimed at improving these properties. This blind SAR campaign has produced a new lead compound of significantly increased in vivo stability and solubility for a 40-fold increase in exposure. This probe represents a significant advancement that will not only enable biophysical characterization of this interaction and further SAR, but also contribute to advances in understanding of MYC biology.
Design, synthesis and biological evaluation of pyrazolyl-nitroimidazole derivatives as potential EGFR/HER-2 kinase inhibitors
A series of novel pyrazole-nitroimidazole derivatives had been arranged and evaluated for their EGFR/HER-2 tyrosine kinase inhibitory activity as well as their antiproliferative properties on four kinds of cancer cell lines (MCF-7, Hela, HepG2, B16-F10). The bioassay results showed most of the designed compounds exhibited potential antiproliferation activity, with the IC50 values ranging from 0.13 mu M to 128.06 mu M in four tumor cell lines. Among them, compound 5c exhibited remarkable inhibitory activity against EGFR/HER-2 tyrosine kinase with IC50 value of 0.26 mu M/0.51 mu M, respectively, comparable to the positive control erlotinib (IC50 = 0.41 mu M for HER-2 and IC50 = 0.20 mu M for EGFR) and lapatinib (IC50 = 0.54 mu M for HER-2 and IC50 = 0.28 mu M for EGFR). Molecular modeling simulation studies were performed in order to predict the biological activity of the proposed compounds and activity relationship (SAR) of these pyrazole-nitroimidazole derivatives. (C) 2015 Elsevier Ltd. All rights reserved.
Synthesis, Characterizations, and Liquid Crystalline Property of Photoresponsive Poly (2-[4-Methoxy Benzoyl Styryloyloxy] Ethyl Methacrylate)
作者:G. Kumar、K. Subramanian
DOI:10.1080/15421406.2011.611734
日期:2012.1.1
A novel liquid crystalline mesophase as well as photoreactive property of photo-crosslinkable liquid crystalline polymer has been studied in detail. The crosslinkable liquid crystalline polymer was synthesized by newer route and its structure has been characterized by H-1 and C-13-Nuclear Magnetic Resonance, Fourier Transformation Infrared, and ultraviolet spectral studies. The photocrosslinking property was studied by using both ultraviolet and fluorescence spectral techniques. The thermogravimetric analysis was used to determine the thermal stability of the polymer. Molecular weight of the polymer was determined using gel permeation chromatography technique. The grainy texture mesophase of the polymer was identified by Differential Scanning Calorimeter thermogram and also from the hot stage optical polarization microphotograph images, and all the results obtained were discussed. The morphology of the polymer network was observed using scanning electron microscopy before and after photocrosslinking process.