Workup-dependent formation of 5-lipoxygenase inhibitory boswellic acid analogues
| Autor: | A. F. W. von Brocke, Hermann P. T. Ammon, Stephan Schweizer, Sven E. Boden, Hasan Safayhi, Ernst Bayer |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
Leukotrienes
Magnetic Resonance Spectroscopy Stereochemistry Neutrophils Carboxylic acid Pharmaceutical Science Gas Chromatography-Mass Spectrometry Analytical Chemistry chemistry.chemical_compound Lipoxygenase Drug Discovery Organic chemistry Lipoxygenase Inhibitors Boswellia Chromatography High Pressure Liquid Pharmacology chemistry.chemical_classification Arachidonate 5-Lipoxygenase Plants Medicinal biology Organic Chemistry Anti-Inflammatory Agents Non-Steroidal biology.organism_classification Triterpenes Enzyme Complementary and alternative medicine chemistry Enzyme inhibitor Arachidonate 5-lipoxygenase biology.protein Chromatography Gel Molecular Medicine Boswellia serrata Boswellic acid Spectrophotometry Ultraviolet Medicine Traditional Resins Plant |
| Zdroj: | Journal of natural products. 63(8) |
| ISSN: | 0163-3864 |
| Popis: | Pentacyclic triterpenes from the 11-keto-boswellic acid series were identified as the active principal ingredients of Boswellia resin, inhibiting the key enzyme of leukotriene biosynthesis, 5-lipoxygenase (5-LO). Of the genuine boswellic acids hitherto characterized, 3-O-acetyl-11-keto-beta-boswellic acid, AKBA (1), proved to be the most potent inhibitor of 5-LO. In the course of purification of further boswellic acid derivatives from Boswellia resin, we observed the degradation of the natural compound 3-O-acetyl-11-hydroxy-beta-boswellic acid (2) to the thermodynamically more stable product 3-O-acetyl-9, 11-dehydro-beta-boswellic acid (4). The metastable intermediate of this conversion, under moderate conditions of workup in methanolic solutions, was identified as 3-O-acetyl-11-methoxy-beta-boswellic acid (3). The novel artifactual boswellic acid derivatives inhibited 5-LO product formation in intact cells with different characteristics: 4 almost totally abolished 5-LO activity, with an IC(50) of 0.75 microM, whereas 3 and 9,11-dehydro-beta-boswellic acid (5), the deacetylated analogue of 4, were incomplete inhibitors. The data suggest that the conditions chosen for the workup of Boswellia extracts could significantly influence the potency of their biological actions and their potential therapeutic effectiveness. |
| Databáze: | OpenAIRE |
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