We have investigated the effect of naringenin (NGEN) on tumor growth in various human cancer cell lines and sarcoma S-180-implanted mice. NGEN showed cytotoxicity in cell lines derived from cancer of the breast (MCF-7, MDA-MB-231), stomach (KATOIII, MKN-7), liver (HepG2, Hep3B, Huh7), cervix (Hela, Hela-TG), pancreas (PK-1), and colon (Caco-2) as well as leukemia (HL-60, NALM-6, Jurkat, U937). NGEN-induced cytotoxicity was low in Caco-2 and high in leukemia cells compared to other cell lines. NGEN dose-dependently induced apoptosis, with hypodiploid cells detected in both Caco-2 and HL-60 by flow cytometric analysis. In vivo, NGEN inhibited tumor growth in sarcoma S-180-implanted mice, following intraperitoneal or peroral injection once a day for 5 d. Naringin (NG) also inhibited tumor growth by peroral injection but not intraperitoneal injection. NGEN, one of the most abundant flavonoids in citrus fruits, may have a potentially useful inhibitory effect on tumor growth.
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