Research and development of bioactive marine natural products

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Investigation of extracts of an Okinawan marine organisms (sponge, tunicate, and dinoflagellate etc.) resulted in the isolation of new manzamine alkaloids exhibiting antimalarial and antitrypanosomal activities, new pyridinium alkaloids exhibiting acetylcholine esterase inhibitory activity, and new terpenoid quinones exhibiting tyrosine kinase inhibitory activity. In addition, many new compounds that show cytotoxic activity (pyridine alkaloids, beta-carboline alkaloids, bromotyrosine alkaloids, a macrolide, and sesquiterpenoids) and anti-microbial activity (bromopyrrole alkaloids, bromotyrosine alkaloids, triterpenoids) were isolated from the marine organisms. The absolute stereochemistries of known cytotoxic macrolides, previously isolated from dinoflagellete by our group, were also elucidated.