Synthesis of new glycyrrhetinic acid (GA) derivatives and their effects on tyrosinase activity
| Autor: | Si-Ho Park, Hong-Sig Sin, Youn-Ja Kwon, Hye-Sook Han, Soo-Jong Um, Myoung-Soon Park |
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| Rok vydání: | 2003 |
| Předmět: |
Stereochemistry
Carboxylic acid Tyrosinase Clinical Biochemistry Pharmaceutical Science Ascorbic Acid Biochemistry Chemical synthesis Aldehyde chemistry.chemical_compound Drug Discovery Enzyme Inhibitors Molecular Biology chemistry.chemical_classification Molecular Structure biology Monophenol Monooxygenase Organic Chemistry Biological activity Skin whitening Enzyme Activation Kinetics chemistry Pyrones Enzyme inhibitor biology.protein Glycyrrhetinic Acid Molecular Medicine Agaricales Kojic acid |
| Zdroj: | Bioorganic & Medicinal Chemistry. 11:5345-5352 |
| ISSN: | 0968-0896 |
| DOI: | 10.1016/j.bmc.2003.09.046 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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