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Novel phthalide compounds from Sparassis crispa (Hanabiratake), Hanabiratakelide A-C, exhibiting anti-cancer related activity.

Sparassis crispa (SC), known as Hanabiratake in Japanese, is an edible mushroom with various medicinal properties. We isolated 3 novel phthalides, designated hanabiratakelide A (1), B (2), and C (3), from the SC fruit body. In this investigation, 3 known phthalides (4-6), ubiquinone-9, and 2 known unsaturated fatty acids were also isolated. Their structures were elucidated primarily through extensive NMR experiments. The isolated compounds 1-6 were tested for their anti-oxidant activity. The in vitro superoxide dismutase-like activity of the 3 hanabiratakelides was stronger than that of vitamin C. The compounds also exerted inhibitory effects on lipopolysaccharide-stimulated nitric oxide and prostaglandin E2 production by a murine macrophage cell line, RAW264. In addition, the growth of the colon cancer cell lines Caco-2 and colon-26 was significantly inhibited by treatment with the 3 hanabiratakelides. In vivo, the frequency of azoxymethane-induced aberrant crypt foci was reduced in SC-fed F344/N rats compared to rats fed a standard diet. In conclusion, 3 novel phthalides, hanabiratakelides, derived from SC were shown to possess anti-oxidant, anti-inflammatory, and anti-tumor activity.