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Novel Marine and Microbial Natural Product Inhibitors of Vacuolar ATPase

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Vacuolar-ATPase (V-ATPase) has been proposed as a drug target in osteoporosis due to its involvement in bone resorption, and as a target in cancer due to potential involvement in tumor invasion and metastasis. The classical selective inhibitors of V-ATPase are microbial macrolides of the bafilomycin and concanamycin class. These inhibitors have proven to be too toxic for therapeutic use, however recent structure-activity studies on bafilomycins, and the isolation of novel macrolide structures from marine sources, have provided new avenues for development of potentially less toxic V-ATPase inhibitors. The novel salicylihalamide and lobatamide series of compounds were predicted to share a common mechanism of action based on the patterns of cytotoxicity produced in the NCI 60-cell cancer screen. They have subsequently been shown to selectively interact with mammalian V-ATPases, but not with fungal V-ATPases. With the recent achievement of total syntheses of salicylihalamide, lobatamide, and related compounds, the elaboration of congeners with specificity for particular enzyme isoforms may provide drug candidates which are less toxic. This review summarizes recent advances in V-ATPase inhibition and the prospects for further progress.

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Keywords: cancer; inhibitors; isolation; lobatamides; osteoporosis; salicylihalamides; synthesis; v-atpase

Document Type: Review Article

Publication date: 2003-05-01

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  • Current Medicinal Chemistry covers all the latest and outstanding developments in medicinal chemistry and rational drug design. Each issue contains a series of timely in-depth reviews written by leaders in the field covering a range of the current topics in medicinal chemistry. Current Medicinal Chemistry is an essential journal for every medicinal chemist who wishes to be kept informed and up-to-date with the latest and most important developments.
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