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Sasa veitchii extract induces anticancer effects via inhibition of cyclin D1 expression in MCF-7 cells

Ichimaru, Yoshimi Kanaeda, Natsuki Tominaga, Sarah Suzui, Masumi Maeda, Tohru Fujii, Hirohisa Nakao, Makoto Yoshioka, Hiroki 名古屋大学

2020.08

概要

Sasa veitchii and other Sasa species are traditional medicinal herbs belonging to a group of Japanese bamboos collectively called Kumazasa, and these species possess the potential for a wide variety of uses. The present study aimed to elucidate the anticancer mechanisms exerted by S. veitchii extract (SE) against a human breast cancer cell line, MCF-7 cells. Freeze-dried Sunchlon® was used as the SE, and cell proliferation activity was measured using the [3H]-thymidine incorporation assay. Induction of apoptosis was assessed via Annexin V and caspase-3 fluorescent staining, the induction of necrosis was measured via propidium iodide staining, and cell cycle-related protein expression was determined using western blot-ting. The IC50 value of the SE was 7.7 μg/mL in MCF-7 cells. Although the primary active ingredient in Sunchlon® is sodium copper chlorophyllin (0.25%), the present results indicated that ingredients other than SCC exert anti-cancer activities (the IC50 value of SCC was 715 μg/mL), and late apoptosis or necrosis was induced in an SE dose-dependent manner. The expression levels of cyclin D1 and Cdk6 were decreased after SE treatment, and there was no change in the Cdk1/2 expression levels. Additionally, the expression of the necrosis-related cell death indicators RIP1 and RIP3 was increased in response to high-dose SE treatments, and this was indicative of cells preparing for programmed cell death. SE induces cell death in MCF-7 cells via the inhibition of cyclin D1 expression at low concentrations, and this extract induces programmed necrosis (necroptosis) by potentiating RIP1/RIP3 expression.

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