Document Detail

Synthesis of new glycyrrhetinic acid (GA) derivatives and their effects on tyrosinase activity.
MedLine Citation:
PMID:  14642578     Owner:  NLM     Status:  MEDLINE    
To synthesize glycyrrhetinic acid (GA) derivatives (3, 4, 5, 10, 13, 14, 15, and 16), we first removed the ketonic group in the C-11 position, and the carboxylic function at the C-30 position was kept intact, reduced to an alcohol, or transformed to an aldehyde corresponding derivatives 10 and 13. Glycyrrhetinic acid (GA) derivatives (3, 4, 5, 15, and 16) were coupled with 4-amino piperpyridine derivatives (12 and 14) and 4-fluorobenzyl bromide at C-30 carboxylic acid position of glycyrrhetinic acid. In subsequent tyrosinase assays, we found that GA derivatives 4, 5, and 16 were not active at early time points, but strongly inhibited tyrosinase activity at late time points. Of the GA derivatives examined, derivative 5 was most active, with an IC(50) value of 50 microM after 2 h reaction. IC(50) values of derivatives 4 and 16 were 120 and 170 microM, respectively. Further kinetic data indicated that these derivatives are slow-binding inhibitors of tyrosinase. The time-dependent inhibition was reversed when vitamin C or kojic acid was used, that is, both compounds showed active inhibition at early time points. These results suggest that GA derivatives are much more stable than vitamin C or kojic acid, although their intrinsic inhibitory potentials are relatively low. Higher stability and activity suggest that GA derivative 5 might be a useful candidate for skin whitening.
Soo-Jong Um; Myoung-Soon Park; Si-Ho Park; Hye-Sook Han; Youn-Ja Kwon; Hong-Sig Sin
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Bioorganic & medicinal chemistry     Volume:  11     ISSN:  0968-0896     ISO Abbreviation:  Bioorg. Med. Chem.     Publication Date:  2003 Dec 
Date Detail:
Created Date:  2003-12-03     Completed Date:  2004-08-23     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9413298     Medline TA:  Bioorg Med Chem     Country:  England    
Other Details:
Languages:  eng     Pagination:  5345-52     Citation Subset:  IM    
Department of Bioscience & Biotechnology/Institute of Bioscience, Sejong University, Seoul 143-747, South Korea.
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MeSH Terms
Agaricales / enzymology
Ascorbic Acid / pharmacology
Enzyme Activation
Enzyme Inhibitors / chemical synthesis*,  pharmacology*
Glycyrrhetinic Acid / analogs & derivatives*,  chemical synthesis,  pharmacology*
Molecular Structure
Monophenol Monooxygenase / antagonists & inhibitors*
Pyrones / pharmacology
Reg. No./Substance:
0/Enzyme Inhibitors; 0/Pyrones; 471-53-4/Glycyrrhetinic Acid; 50-81-7/Ascorbic Acid; 501-30-4/kojic acid; EC Monooxygenase

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