Chemiluminescence Change of Polyphenol Dendrimers with Different Core Molecules
摘要:
Second generation polyphenol dendrimers (PDs) with different core molecules were synthesized, and their chemiluminescence (CL) was measured by reacting the PDs with H2O2 under alkaline conditions. All of the PDs showed a strong CL, more than 120-fold greater than that of gallic acid. Various CL intensities of the PDs were obtained using different core molecules in the PDs. The distance between each dendron in the PD structure is crucial in the PD CL intensity.
Linear and branched alkyl-esters and amides of gallic acid and other (mono-, di- and tri-) hydroxy benzoyl derivatives as promising anti-HCV inhibitors
作者:Eva Rivero-Buceta、Paula Carrero、Elisa G. Doyagüez、Andrés Madrona、Ernesto Quesada、María José Camarasa、María Jesús Peréz-Pérez、Pieter Leyssen、Jan Paeshuyse、Jan Balzarini、Johan Neyts、Ana San-Félix
DOI:10.1016/j.ejmech.2015.01.033
日期:2015.3
Linear and branched compounds that contain two, three or five units of galloyl (3,4,5-trihydroxybenzoyl) or its isomer 2,3,4-trihydroxybenzoyl, as well as other mono- or dihydroxybenzoyl moieties have been synthesized. These molecules have been evaluated for their in vitro inhibitory effects against a wide panel of viruses showing preferential activity against HIV and HCV.Our structure-activity relationship studies demonstrated that the 2,3,4-trihydroxybenzoyl moiety provides better antiviral activities than the galloyl (3,4,5-trihydroxybenzoyl) moiety that is present in natural green tea catechins. This observation can be of interest for the further rational exploration of compounds with anti-HCV/HIV properties.The most notable finding with respect to HIV is that the tripodal compounds 43 and 45, with three 2,3,4-trihydroxybenzoyl moieties, showed higher activities than linear compounds with only one or two. With respect to HCV, the linear compounds, 52 and 41, containing a 12 polymethylene chain and two 2,3 di- or 2,3,4 tri-hydroxybenzoyl groups respectively at the ends of the molecule showed good antiviral efficiency. Furthermore, the anti-HCV activity of both compounds was observed at concentrations well below the cytotoxicity threshold. A representative member of these compounds, 41, showed that the anti-HCV activity was largely independent of the genetic make-up of the HCV subgenomic replicon and cell lines used. (C) 2015 Elsevier Masson SAS. All rights reserved.
Simple di- and trivanillates exhibit cytostatic properties toward cancer cells resistant to pro-apoptotic stimuli
A series of 33 novel divanillates and trivanillates were synthesized and found to possess promising cytostatic rather than cytotoxic properties. Several compounds under study decreased by >50% the activity of Aurora A, B, and C, and WEE1 kinase activity at concentrations <10% of their IC50 growth inhibitory ones, accounting, at least partly, for their cytostatic effects in cancer cells and to a lesser extent in normal cells. Compounds 6b and 13c represent interesting starting points for the development of cytostatic agents to combat cancers, which are naturally resistant to pro-apoptotic stimuli, including metastatic malignancies. (C) 2010 Elsevier Ltd. All rights reserved.
Chemiluminescence Change of Polyphenol Dendrimers with Different Core Molecules
Second generation polyphenol dendrimers (PDs) with different core molecules were synthesized, and their chemiluminescence (CL) was measured by reacting the PDs with H2O2 under alkaline conditions. All of the PDs showed a strong CL, more than 120-fold greater than that of gallic acid. Various CL intensities of the PDs were obtained using different core molecules in the PDs. The distance between each dendron in the PD structure is crucial in the PD CL intensity.
Structure-Activity Relationship of Bis-Galloyl Derivatives Related to (-)-Epigallocatechin Gallate
作者:Kosuke Dodo、Taro Minato、Yuichi Hashimoto
DOI:10.1248/cpb.57.190
日期:——
Green tea and (−)-epigallocatechin gallate (EGCG: one of main components of green tea) are well known to have preventive activities against human cancers. Previously, using a galloyl group as a core structure derived from EGCG, we developed alkyl gallate and gallamide derivatives, which showed strong antiproliferative activity towards human leukemia HL-60 cells by inducing apoptosis. Here, as a further structural development study, we planned to introduce an additional galloyl group into alkyl gallates and gallamides. According to this strategy, various bisgallate and bisgallamide derivatives were synthesized and tested for antiproliferative activity towards HL-60 cells. In gallamide derivatives having a short alkyl chain, the additional galloyl group enhanced the antiproliferative activity. In contrast, in the gallate derivatives, the additional galloyl group had no effect on the antiproliferative activity.