We attempted to screen for telomerase inhibitingactivity in vitro from a total of 304 marine algae samples which were collected from various Japancoasts by nonradioisotope telomeric repeatamplification protocol (Non-RI TRAP) assay using humanleukemia MOLT-4 cells. Ten of the MeOH extracts andtwo of the PBS extracts from those algal samplesshowed telomerase inhibiting activity. In particular,the MeOH extract from a green alga, Caulerpasertularioides strongly inhibited telomerase activitywhen added to MOLT-4 cell culture at a level of 1.25%(v/v), suggesting that it may be possible to developa novel anti-cancer agent in view of its specificanti-telomeric property.
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