Discovery of Platelet-Type 12-Human Lipoxygenase Selective Inhibitors by High-Throughput Screening of Structurally Diverse Libraries
| Autor: | Theodore R. Holman, Joshua D. Deschamps, Stephanie Whitman, Jeffrey T. Gautschi, Phillip Crews, Tyler A. Johnson, Nadine C. Gassner |
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| Jazyk: | angličtina |
| Rok vydání: | 2007 |
| Předmět: |
Blood Platelets
Databases Factual High-throughput screening Clinical Biochemistry Drug Evaluation Preclinical Pharmaceutical Science Biochemistry Isozyme Article chemistry.chemical_compound Lipoxygenase Structure-Activity Relationship Drug Discovery Structure–activity relationship Combinatorial Chemistry Techniques Humans Lipoxygenase Inhibitors Molecular Biology chemistry.chemical_classification Natural product biology Molecular Structure Organic Chemistry Reproducibility of Results Isoenzymes Kinetics Enzyme chemistry Enzyme inhibitor biology.protein Molecular Medicine Michellamine B |
| Popis: | Human lipoxygenases (hLO) have been implicated in a variety of diseases and cancers and each hLO isozyme appears to have distinct roles in cellular biology. This fact emphasizes the need for discovering selective hLO inhibitors for both understanding the role of specific lipoxygenases in the cell and developing pharmaceutical therapeutics. To this end, we have modified a known lipoxygenase assay for high-throughput (HTP) screening of both the National Cancer Institute (NCI) and the UC Santa Cruz marine extract library (UCSC-MEL) in search of platelet-type 12-hLO (12-hLO) selective inhibitors. The HTP screen led to the characterization of five novel 12-hLO inhibitors from the NCI repository. One is the potent but non-selective michellamine B, a natural product, anti-viral agent. The other four compounds were selective inhibitors against 12-hLO, with three being synthetic compounds and one being alpha-mangostin, a natural product, caspase-3 pathway inhibitor. In addition, a selective inhibitor was isolated from the UCSC-MEL (neodysidenin), which has a unique chemical scaffold for a hLO inhibitor. Due to the unique structure of neodysidenin, steady-state inhibition kinetics were performed and its mode of inhibition against 12-hLO was determined to be competitive (K(i)=17microM) and selective over reticulocyte 15-hLO-1 (K(i) 15-hLO-1/12-hLO>30). |
| Databáze: | OpenAIRE |
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