© 1990 Oxford University Press
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Structure-activity relationship within a series of okadaic acid derivatives
Cancer Prevention Division, National Cancer Center Research Institute 5-1-1 Tsukiji, Chuo-ku, Tokyo 104
2Department of Chemistry. Faculty of Science, Nagoya University Chikusa-ku, Nagoya 464
3Faculty of Arts, Shizuoka University Ohya, Shizuoka 422
4Department of Food Chemistry, Faculty of Agriculture, Tohoku University Tsutsumidori Amamiya, Sendai 980, Japan
5Department of Chemistry, University of Oklahoma Norman, Oklahoma 73019, USA
6National Cancer Center Chuo-ku, Tokyo 104, Japan
1To whom correspondence should be addressed
Okadaic acid (OA) is a potent non-12-O-tetradecanoyl-phorbol-13-acetate (non-TPA) type tumor promoter on mouse skin. OA acts on cells through inhibiting the activity of protein phosphatases and results in the increase of phosphorylation of proteins. Seventeen OA derivatives were evaluated as possible tumor promoters by means of three biochemical tests: inhibition of specific [3H]OA binding to a particulate fraction of mouse skin containing protein phosphatases, inhibition of protein phosphatase activity, and induction of ornithine decarboxylase in mouse skin. Potency in each of these biochemical tests correlated well for each of these derivatives. We present results indicating that the carboxyl group as well as the four hydroxyl groups at C-2, C-7, C-24 and C-27 of OA are important for activity. Acanthifolicin, which gave positive responses in these three biochemical tests as strong as those of OA and dinophysistoxin-1, is predicted to be an additional member of the OA class of tumor promoters.
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