Your browser doesn't support javascript.
loading
Show: 20 | 50 | 100
Results 1 - 1 de 1
Filter
Add more filters










Database
Language
Publication year range
1.
Bioorg Med Chem ; 19(11): 3378-83, 2011 Jun 01.
Article in English | MEDLINE | ID: mdl-21571537

ABSTRACT

In the course of our program to search for protein tyrosine phosphatase 1B (PTPB) inhibitors, five new 5-deoxyflavonoids along with eight known derivatives were isolated from EtOAc layer of the root bark of Erythrina abyssinica. Their structures were elucidated on the basis of spectroscopic (IR, UV, MS, CD, 1D- and 2D-NMR) and physicochemical analyses. All isolates exhibited moderate inhibitory effects on the enzyme assay with IC50 values ranging from 14.9 ± 1.6 to 98.1 ± 11.3 µM. Compounds with prenyl and methoxy groups in the B ring (1, 2, 4, 8, and 13) possessed strong activity (IC(50) 14.9 ± 1.6 to 19.2 ± 1.1 µM), while compounds (3, 5, and 9) with 2,2-dimethylpyrano ring showed less inhibitory effect (IC50 22.6 ± 2.3 to 72.9 ± 9.7 µM). These results suggest that prenyl and methoxy groups may be responsible for the increase on the activity of 5-deoxyflavonoids against PTP1B, but the presence of 2,2-dimethylpyrano ring on the B ring may be induced the decrease of PTP1B inhibitory activity.


Subject(s)
Enzyme Inhibitors/chemistry , Flavonoids/chemistry , Protein Tyrosine Phosphatase, Non-Receptor Type 1/antagonists & inhibitors , Circular Dichroism , Enzyme Inhibitors/isolation & purification , Enzyme Inhibitors/pharmacology , Erythrina/chemistry , Flavonoids/isolation & purification , Flavonoids/pharmacology , Humans , Magnetic Resonance Spectroscopy , Molecular Conformation , Plant Bark/chemistry , Plant Roots/chemistry , Protein Tyrosine Phosphatase, Non-Receptor Type 1/metabolism
SELECTION OF CITATIONS
SEARCH DETAIL
...