Structure–activity relationship studies of flavopiridol analogues
摘要:
Cyclin dependent kinases (CDKs) along with the complementary cyclins form key regulatory checkpoint controls on the cell cycle. Flavopiridol is a synthetic flavone that shows potent and selective cyclin-dependent kinase inhibitory activity. In this paper, we report modifications of the 3-hydroxy-1-methylpiperidinyl (D ring) of flavopiridol and their effect on CDK inhibitory activity. (C) 2000 Elsevier Science Ltd. All rights reserved.
Bioactivity of glycogen phosphorylase inhibitors that bind to the purine nucleoside site
作者:Laura J. Hampson、Catherine Arden、Loranne Agius、Minas Ganotidis、Magda N. Kosmopoulou、Costas Tiraidis、Yiannis Elemes、Constantinos Sakarellos、Demetres D. Leonidas、Nikos G. Oikonomakos
DOI:10.1016/j.bmc.2006.07.060
日期:2006.12
The bioactivity in hepatocytes of glycogen phosphorylase inhibitors that bind to the active site, the allosteric activator site and the indole carboxamide site has been described. However, the pharmacological potential of the purine nucleoside inhibitor site has remained unexplored. We report the chemical synthesis and bioactivity in hepatocytes of four new olefin derivatives of flavopiridol (1-4) that bind to the purine site. Flavopiridol and 1-4 counteracted the activation of phosphorylase in hepatocytes caused by AICAR (5-aminoimidazole-4-carboxamide 1-beta-D-ribofuranoside), which is metabolised to an AMP analogue. Unlike an indole carboxamide inhibitor, the analogues I and 4 suppressed the basal rate of glycogenolysis in hepatocytes by allosteric inhibition rather than by inactivation of phosphorylase, and accordingly caused negligible stimulation of glycogen synthesis. However, they counteracted the stimulation of glycogenolysis by dibutyryl cAMP by both allosteric inhibition and inactivation of phosphorylase. Cumulatively, the results show key differences between purine site and indole carboxamide site inhibitors in terms of (i) relative roles of dephosphorylation of phosphorylase-a as compared with allosteric inhibition, (ii) counteraction of the efficacy of the inhibitors on glycogenolysis by dibutyryl-cAMP and (iii) stimulation of glycogen synthesis. (c) 2006 Elsevier Ltd. All rights reserved.
Identification of a new series of flavopiridol-like structures as kinase inhibitors with high cytotoxic potency
In this work, unique flavopiridol analogs bearing thiosugars, amino acids and heterocyclic moieties tethered to the flavopiridol via thioether and amine bonds mainly on its C ring have been prepared. The analogs bearing thioether-benzimidazoles as substituents have demonstrated high cytotoxic activity in vitro against up to seven cancercell lines. Their cytotoxic effects are comparable to those of
Structure–activity relationship studies of flavopiridol analogues
作者:Krishna K. Murthi、Marja Dubay、Christopher McClure、Leonardo Brizuela、Michael D. Boisclair、Peter J. Worland、Muzammil M. Mansuri、Kollol Pal
DOI:10.1016/s0960-894x(00)00156-6
日期:2000.5
Cyclin dependent kinases (CDKs) along with the complementary cyclins form key regulatory checkpoint controls on the cell cycle. Flavopiridol is a synthetic flavone that shows potent and selective cyclin-dependent kinase inhibitory activity. In this paper, we report modifications of the 3-hydroxy-1-methylpiperidinyl (D ring) of flavopiridol and their effect on CDK inhibitory activity. (C) 2000 Elsevier Science Ltd. All rights reserved.