Display Settings:

Format

Send to:

Choose Destination
We are sorry, but NCBI web applications do not support your browser and may not function properly. More information
Curr Drug Discov Technol. 2005 Sep;2(3):185-93.

Application of the in combo screening approach for the discovery of non-alkaloid acetylcholinesterase inhibitors from Cichorium intybus.

Author information

  • 1Institute of Pharmacy / Pharmacognosy, Josef-Moeller-Haus, Innrain 52c, Austria. judith.rollinger@uibk.ac.at

Erratum in

  • Curr Drug Discov Technol. 2006 Mar;3(1):89.

Abstract

Because of the direct correlation of cholinergic deficit and the severity of dementia, Alzheimer's disease is preferentially treated with acetylcholinesterase (AChE) inhibitors to supplement the acetylcholine level. In this study we focused on non-alkaloid AChE inhibitors from natural sources in order to discover new lead structures. In the course of in vitro extract screening of Tyrolean plants using an enzyme assay with Ellman's reagent, the dichloromethane extract of chicory roots (Cichorium intybus L.) showed a pronounced inhibitory effect on AChE. At a concentration of 1 mg extract/ml an inhibition of 70% was measured. Based on a 3D multi-conformational molecular-structure database consisting of secondary metabolites from C. intybus known from the relevant literature, virtual screening filtering experiments were conducted using both a feature-based pharmacophore model and a docking procedure. Some low molecular weight sesquiterpenoids exhibited distinct interactions with the pharmacophore model. In order to verify the applicability of this computer-aided strategy, an activity-guided fractionation of the chicory root extract was performed, which resulted in the isolation of two sesquiterpene lactones, 8-deoxylactucin and lactucopicrin, showing significant and dose-dependent inhibitory activity on AChE (IC(50) of 308.1 microM [CI(95) 243.9 - 405.3 microM] and 150.3 microM [CI(95) 100.8 - 188.1 microM], respectively). The two isolates were correctly predicted within the virtual screening process which corroborates the potential of the computer-assisted in combo screening approach for the discovery of the anti-cholinesterase compounds from C. intybus.

PMID:
16472227
[PubMed - indexed for MEDLINE]
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for Bentham Science Publishers Ltd.
    Loading ...
    Write to the Help Desk