Synthesis and biophysical evaluation of arylhydrazono-1H-2-indolinones as β-amyloid aggregation inhibitors
作者:Francesco Campagna、Marco Catto、Rosa Purgatorio、Cosimo D. Altomare、Angelo Carotti、Angelo De Stradis、Gerardo Palazzo
DOI:10.1016/j.ejmech.2010.11.015
日期:2011.1
A series of isatin-3-arylhydrazones were synthesized and evaluated in vitro as inhibitors of A beta(1-40) aggregation using a thioflavin T fluorescence method. An exploration of the effects on A beta(1-40) aggregation of a number of diverse substituents at phenylhydrazone group and 5,6- positions of the indolinone nucleus led us to single out some new anti-aggregating compounds with IC50 values in the low micromolar range. The most active compounds carry methoxy- or hydroxy- substituents in the indolinone 5,6-positions and lipophilic groups such as iPr and Cl at 4'- and 3'-position, respectively, of the phenylhydrazone moiety. Two derivatives are noteworthy, namely 18 (IC50 = 0.4 mu M) and 42 (IC50 = 1.1 mu M). The in vitro effects of the highly active, water soluble, compound 42 on the temporal evolution of A beta(1-40) fibrils formation were further investigated by circular dichroism spectroscopy, transmission electron microscopy and dynamic light scattering studies, which clearly showed that this compound delayed and lowered the amyloid fibril formation. (C) 2010 Elsevier Masson SAS. All rights reserved.
Synthesis and evaluation of oxindoles as promising inhibitors of the immunosuppressive enzyme indoleamine 2,3-dioxygenase 1
作者:Saurav Paul、Ashalata Roy、Suman Jyoti Deka、Subhankar Panda、Gopal Narayan Srivastava、Vishal Trivedi、Debasis Manna
DOI:10.1039/c7md00226b
日期:——
oxindoles from L-Trp, tryptamine and isatin. Compounds with C3-substituted oxindole moieties showed moderate inhibitory activity against the purified human IDO1 enzyme. Their optimization led to the identification of potent compounds, 6, 22, 23 and 25 (IC50 = 0.19 to 0.62 μM), which are competitive inhibitors of IDO1 with respect to L-Trp. These potent compounds also showed IDO1 inhibition potencies in