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- W1232411418 abstract "Even though we previously reported that dietary lutein can inhibit mammary tumor growth, the mechanism of this action was unknown. Here, we studied the action of dietary lutein through its possible regulation of apoptosis and angiogenesis. Female BALB/c mice were fed a semi-purified diet containing 0 (control), 0.002 or 0.02% lutein (n = 20/treatment) for 2 weeks prior to inoculation with 100,000 -SA mouse mammary tumor cells into the right mammary fat pad. Tumor volume was measured daily until day 50 postinoculation when all mice were killed. Angiogenesis and apoptosis activities in the tumors were measured by immunohistochemistry. Apoptosis and necrosis of blood lymphocytes were quantitated by flow cytometry using Annexin V-FITC and propidium iodide staining. The expression of the p53, Bax and Bcl-2 mRNA was measured by RT-PCR amplification. Lutein was not detectable in the plasma, liver or tumor of unsupplemented mice, but increased in a dose-dependent manner in lutein-supplemented mice. Mice fed lutein had tumors that were 30 to 40% smaller (p < 0.05) on day 50 post-inoculation compared to unsupplemented mice. Final tumor volume was lowest in mice fed 0.002% lutein. Mice fed lutein had higher apoptotic activity in the tumors but lower apoptotic activity in blood lymphocytes as compared to unsupplemented animals. These observations were supported by the observed increase in the expression of the proapoptotic genes, p53 and Bax, together with a decrease in the expression of the antiapoptotic gene, Bcl-2, and consequently an increase in the Bax:Bcl-2 ratio in tumors from lutein-fed mice. Furthermore, lutein-fed mice also had lower (p < 0.05) angiogenic activity in the tumors as compared to unsupplemented mice. The greatest beneficial effect on apoptosis and angiogenesis was observed with mice fed 0.002% lutein. Therefore, dietary lutein, especially at 0.002%, inhibited tumor growth by selectively modulating apoptosis, and by inhibiting angiogenesis." @default.
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- W1232411418 date "2003-08-21" @default.
- W1232411418 modified "2023-09-23" @default.
- W1232411418 title "Dietary lutein inhibits mouse mammary tumor growth by regulating angiogenesis and apoptosis." @default.
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