Antiproliferative effect of dehydrodidemnin B (DDB), a depsipeptide isolated from Mediterranean tunicates

Cancer Letters
J L UrdialesF Sánchez-Jiménez

Abstract

The biological effects of dehydrodidemnin B(DDB), a novel depsipeptide isolated from Aplidium albicans, were studied on Ehrlich carcinoma growing in vivo and in primary cultures, and compared with those reported for Didemnin B (DB). Daily administration of DB or DDB (2.5 micrograms/mouse) almost duplicated the animal life-span and total number of tumour cells decreased by 70-90%. Results suggest a major effect of DDB when administered in the lag phase of growth. DDB behaved as a very potent inhibitor of protein synthesis; consequently, ornithine decarboxylase activity (ODC, EC 4.1.1.17) is drastically reduced by DDB-treatment.

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