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Cytotoxic Polyketides from the Marine Sponge Discodermia calyx

  • Shinde, Pramod B. (College of Pharmacy, Pusan National University) ;
  • Mansoor, Tayyab A. (College of Pharmacy, Pusan National University) ;
  • Luo, Xuan (College of Pharmacy, Pusan National University) ;
  • Hong, Jong-Ki (College of Pharmacy, Kyung Hee University) ;
  • Lee, Chong-O. (Pharmaceutical Screening Center, Korea Research Institute of Chemical Technology) ;
  • Jung, Jee-H. (College of Pharmacy, Pusan National University)
  • Published : 2007.06.20

Abstract

Bioassay-guided fractionation of the MeOH extract from the sponge Discodermia calyx collected off the coast of Jeju Island, South Korea, led to the isolation of a polyketide, icadamide C (1), along with previously reported theopederin K (3). Structure elucidation was performed by a combination of high resolution mass and 2D-NMR (principally COSY, HMBC, HSQC, and NOESY) spectroscopy. Stereochemistry of compound 1 was determined as 2R*, 3R*, 6R*, 10S*, 11S*, 12R*, 13S*, 15R* and 2'S by NMR data and Marfey analysis. Isolated metabolites displayed potent cytotoxic activity against a small panel of five human solid tumor cell lines with ED50 values of less than 0.1 μg/mL.

Keywords

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