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Sponge-Derived Fijianolide Polyketide Class:  Further Evaluation of Their Structural and Cytotoxicity Properties

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journal contribution
posted on 09.08.2007, 00:00 authored by Tyler A. Johnson, Karen Tenney, Robert H. Cichewicz, Brandon I. Morinaka, Kimberly N. White, Taro Amagata, Balanehru Subramanian, Joseph Media, Susan L. Mooberry, Frederick A. Valeriote, Phillip Crews
The sponge-derived polyketide macrolides fijianolides A (1) and B (2), isolaulimalide and laulimalide, have taxol-like microtubule-stabilizing activity, and the latter exhibits potent cytotoxicity. Insight on the biogeographical and phenotypic variations of Cacospongia mycofijiensis is presented that will enable a future study of the biosynthetic pathway that produces the fijianolides. In addition to fijianolides A and B, six new fijianolides, D−I (712), were isolated, each with modifications to the C-20 side chain of the macrolide ring. Compounds 712 exhibited a range of in vitro activities against HCT-116 and MDA-MB-435 cell lines. Fijianolides 8 and 10 were shown to disrupt interphase and mitotic division, but were less potent than 2. An in vivo evaluation of 2 using tumor-bearing severe combined immuno-deficiency mice demonstrated significant inhibition of growth in HCT-116 tumors over 28 days.