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delta tocopherol/tumore della mammella
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The application of 19F magnetic resonance ex vivo imaging of three-dimensional cultured breast cancer cells to study the effect of delta-tocopherol.
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The aim of this study was to determine the role of delta-tocopherol in breast cancer cell growth ex vivo. Human gland mammary adenocarcinoma (MCF-7) and human T-lymphoblastoid (CEM) cells were cultured in the presence of delta-tocopherol at various concentrations (0-750 microM) for 5 days. We have
Chemopreventive activity of vitamin E in breast cancer: a focus on γ- and δ-tocopherol.
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Vitamin E consists of eight different variants: α-, β-, γ-, and δ-tocopherols (saturated phytyl tail) and α-, β-, γ-, and δ-tocotrienols (unsaturated phytyl tail). Cancer prevention studies with vitamin E have primarily utilized the variant α-tocopherol. To no avail, a majority of these studies
Inhibitory Effects of γ- and δ-Tocopherols on Estrogen-Stimulated Breast Cancer In Vitro and In Vivo.
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Estrogens have been implicated as complete carcinogens for breast and other tissues through mechanisms involving increased cell proliferation, oxidative stress, and DNA damage. Because of their potent antioxidant activity and other effects, tocopherols have been shown to exert antitumor activities
Does lack of tocopherols and tocotrienols put women at increased risk of breast cancer?
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Breast cancer is the leading site of new cancers in women and the second leading cause (after lung cancer) of cancer mortality in women. Observational studies that have collected data for dietary exposure to alpha-tocopherol with or without the other related tocopherols and tocotrienols have
Induction of apoptosis in human breast cancer cells by tocopherols and tocotrienols.
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The apoptosis-inducing properties of RRR-alpha-, beta-, gamma-, and delta-tocopherols, alpha-, gamma-, and delta-tocotrienols, RRR-alpha-tocopheryl acetate (vitamin E acetate), and RRR-alpha-tocopheryl succinate (vitamin E succinate) were investigated in estrogen-responsive MCF7 and
Dietary administration of δ- and γ-tocopherol inhibits tumorigenesis in the animal model of estrogen receptor-positive, but not HER-2 breast cancer.
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Tocopherol, a member of the vitamin E family, consists of four forms designated as α, β, γ, and δ. Several large cancer prevention studies with α-tocopherol have reported no beneficial results, but recent laboratory studies have suggested that δ- and γ-tocopherol may be more effective. In two
HPLC Separation of Vitamin E and Its Oxidation Products and Effects of Oxidized Tocotrienols on the Viability of MCF-7 Breast Cancer Cells in Vitro.
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Tocotrienols, a vitamin E subgroup, exert potent anticancer effects, but easily degrade due to oxidation. Eight vitamin E reference compounds, α-, β-, γ-, or δ-tocopherols or -tocotrienols, were thermally oxidized in n-hexane. The corresponding predominantly dimeric oxidation products were separated
Antiproliferative and apoptotic effects of tocopherols and tocotrienols on preneoplastic and neoplastic mouse mammary epithelial cells.
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Studies were conducted to determine the comparative effects of tocopherols and tocotrienols on preneoplastic (CL-S1), neoplastic (-SA), and highly malignant (+SA) mouse mammary epithelial cell growth and viability in vitro. Over a 5-day culture period, treatment with 0-120 microM alpha- and
Mixed tocopherols inhibit N-methyl-N-nitrosourea-induced mammary tumor growth in rats.
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Tocopherols are present in significant amounts in vegetable oils used in human foods. The most prevalent tocopherols in foods are the alpha, beta, gamma, and delta variants with (RRR) stereochemistry. Tocopherols are lipophilic phenolic antioxidants, produced by plants. In the United States,
Mixed tocopherols prevent mammary tumorigenesis by inhibiting estrogen action and activating PPAR-gamma.
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OBJECTIVE
Tocopherols are lipophilic antioxidants present in vegetable oils. Although the antioxidant and anticancer activities of alpha-tocopherol (vitamin E) have been studied for decades, recent intervention studies with alpha-tocopherol have been negative for protection from cancer in humans.
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