Synthesis and Evaluation of the 4-Substituted 2-Hydroxy-5-Iodochalcones and Their 7-Substituted 6-Iodoflavonol Derivatives for Inhibitory Effect on Cholinesterases and β-Secretase
A series of 2-aryl-3-hydroxy-6-iodo-4<i>H</i>-chromen-4-ones substituted at the 7-position with a halogen atom (<i>X</i> = F, Cl and Br) or methoxy group and their corresponding 4-substituted 2-hydroxy-5-iodochalcone precursors were evaluated in vitro for inhibitory effect ag...
Main Authors: | , , |
---|---|
Format: | Article |
Language: | English |
Published: |
MDPI AG
2018-12-01
|
Series: | International Journal of Molecular Sciences |
Subjects: | |
Online Access: | https://www.mdpi.com/1422-0067/19/12/4112 |
id |
doaj-de0f61beb370408e9ea1d1c711f607fe |
---|---|
record_format |
Article |
spelling |
doaj-de0f61beb370408e9ea1d1c711f607fe2020-11-25T00:44:15ZengMDPI AGInternational Journal of Molecular Sciences1422-00672018-12-011912411210.3390/ijms19124112ijms19124112Synthesis and Evaluation of the 4-Substituted 2-Hydroxy-5-Iodochalcones and Their 7-Substituted 6-Iodoflavonol Derivatives for Inhibitory Effect on Cholinesterases and β-SecretaseMalose J. Mphahlele0Emmanuel N. Agbo1Samantha Gildenhuys2Department of Chemistry, College of Science, Engineering and Technology, University of South Africa, Private Bag X06, Florida 1710, South AfricaDepartment of Chemistry, College of Science, Engineering and Technology, University of South Africa, Private Bag X06, Florida 1710, South AfricaDepartment of Life & Consumer Sciences, College of Agriculture and Environmental Sciences, University of South Africa, Private Bag X06, Florida 1710, South AfricaA series of 2-aryl-3-hydroxy-6-iodo-4<i>H</i>-chromen-4-ones substituted at the 7-position with a halogen atom (<i>X</i> = F, Cl and Br) or methoxy group and their corresponding 4-substituted 2-hydroxy-5-iodochalcone precursors were evaluated in vitro for inhibitory effect against acetylcholinesterase (AChE), butyrylcholinesterase (BChE) and β-secretase (BACE1) activities. Although moderate inhibitory effect was observed for the chalcones against AChE, derivatives <b>2h</b>, <b>2j</b> and <b>2n</b> exhibited significant inhibitory effect against BChE and BACE-1. The 2-aryl-7-fluoro-8-iodoflavonols <b>3b</b> and <b>3c</b>, on the other hand, exhibited increased activity and selectivity against AChE and reduced effect on BACE-1. The flavonols <b>3h</b>, <b>3i</b>, <b>3k</b>, <b>3l</b> and <b>3p</b> exhibited moderate inhibitory effect against AChE, but significant inhibition against BChE. Compounds <b>2j</b> and <b>3l</b> exhibited non-competitive mode of inhibition against BACE-1. Molecular docking predicted strong interactions with the protein residues in the active site of BACE-1 implying these compounds bind with the substrate. Similarly docking studies predicted interaction of the most active compounds with both CAS and PAS of either AChE or BChE with mixed type of enzyme inhibition confirmed by kinetic studies.https://www.mdpi.com/1422-0067/19/12/41124-substituted 2-hydroxy-5-iodochalcones7-substituted 6-iodoflavonolsX-raycholinesterasesBACE-1molecular docking |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Malose J. Mphahlele Emmanuel N. Agbo Samantha Gildenhuys |
spellingShingle |
Malose J. Mphahlele Emmanuel N. Agbo Samantha Gildenhuys Synthesis and Evaluation of the 4-Substituted 2-Hydroxy-5-Iodochalcones and Their 7-Substituted 6-Iodoflavonol Derivatives for Inhibitory Effect on Cholinesterases and β-Secretase International Journal of Molecular Sciences 4-substituted 2-hydroxy-5-iodochalcones 7-substituted 6-iodoflavonols X-ray cholinesterases BACE-1 molecular docking |
author_facet |
Malose J. Mphahlele Emmanuel N. Agbo Samantha Gildenhuys |
author_sort |
Malose J. Mphahlele |
title |
Synthesis and Evaluation of the 4-Substituted 2-Hydroxy-5-Iodochalcones and Their 7-Substituted 6-Iodoflavonol Derivatives for Inhibitory Effect on Cholinesterases and β-Secretase |
title_short |
Synthesis and Evaluation of the 4-Substituted 2-Hydroxy-5-Iodochalcones and Their 7-Substituted 6-Iodoflavonol Derivatives for Inhibitory Effect on Cholinesterases and β-Secretase |
title_full |
Synthesis and Evaluation of the 4-Substituted 2-Hydroxy-5-Iodochalcones and Their 7-Substituted 6-Iodoflavonol Derivatives for Inhibitory Effect on Cholinesterases and β-Secretase |
title_fullStr |
Synthesis and Evaluation of the 4-Substituted 2-Hydroxy-5-Iodochalcones and Their 7-Substituted 6-Iodoflavonol Derivatives for Inhibitory Effect on Cholinesterases and β-Secretase |
title_full_unstemmed |
Synthesis and Evaluation of the 4-Substituted 2-Hydroxy-5-Iodochalcones and Their 7-Substituted 6-Iodoflavonol Derivatives for Inhibitory Effect on Cholinesterases and β-Secretase |
title_sort |
synthesis and evaluation of the 4-substituted 2-hydroxy-5-iodochalcones and their 7-substituted 6-iodoflavonol derivatives for inhibitory effect on cholinesterases and β-secretase |
publisher |
MDPI AG |
series |
International Journal of Molecular Sciences |
issn |
1422-0067 |
publishDate |
2018-12-01 |
description |
A series of 2-aryl-3-hydroxy-6-iodo-4<i>H</i>-chromen-4-ones substituted at the 7-position with a halogen atom (<i>X</i> = F, Cl and Br) or methoxy group and their corresponding 4-substituted 2-hydroxy-5-iodochalcone precursors were evaluated in vitro for inhibitory effect against acetylcholinesterase (AChE), butyrylcholinesterase (BChE) and β-secretase (BACE1) activities. Although moderate inhibitory effect was observed for the chalcones against AChE, derivatives <b>2h</b>, <b>2j</b> and <b>2n</b> exhibited significant inhibitory effect against BChE and BACE-1. The 2-aryl-7-fluoro-8-iodoflavonols <b>3b</b> and <b>3c</b>, on the other hand, exhibited increased activity and selectivity against AChE and reduced effect on BACE-1. The flavonols <b>3h</b>, <b>3i</b>, <b>3k</b>, <b>3l</b> and <b>3p</b> exhibited moderate inhibitory effect against AChE, but significant inhibition against BChE. Compounds <b>2j</b> and <b>3l</b> exhibited non-competitive mode of inhibition against BACE-1. Molecular docking predicted strong interactions with the protein residues in the active site of BACE-1 implying these compounds bind with the substrate. Similarly docking studies predicted interaction of the most active compounds with both CAS and PAS of either AChE or BChE with mixed type of enzyme inhibition confirmed by kinetic studies. |
topic |
4-substituted 2-hydroxy-5-iodochalcones 7-substituted 6-iodoflavonols X-ray cholinesterases BACE-1 molecular docking |
url |
https://www.mdpi.com/1422-0067/19/12/4112 |
work_keys_str_mv |
AT malosejmphahlele synthesisandevaluationofthe4substituted2hydroxy5iodochalconesandtheir7substituted6iodoflavonolderivativesforinhibitoryeffectoncholinesterasesandbsecretase AT emmanuelnagbo synthesisandevaluationofthe4substituted2hydroxy5iodochalconesandtheir7substituted6iodoflavonolderivativesforinhibitoryeffectoncholinesterasesandbsecretase AT samanthagildenhuys synthesisandevaluationofthe4substituted2hydroxy5iodochalconesandtheir7substituted6iodoflavonolderivativesforinhibitoryeffectoncholinesterasesandbsecretase |
_version_ |
1725275415755358208 |