Combined antioxidant (β-carotene, α-tocopherol and ascorbic acid) supplementation increases the levels of lung retinoic acid and inhibits the activation of mitogen-activated protein kinase in the ferret lung cancer model

Dietary modulation of carcinogenesis-related pathwaysDietary item or component studied: b-carotene (BC), a-tocopherol (AT) and ascorbic acid (AA)Pathways studied: BC metabolism, activation of the MAP kinase pathway Study type (in vitro, animals, humans): male ferretsMode of exposure (if in vivo) (acute, chronic, root of exposure): 2diets, for 6 weeks and for 6 monthsImpact on pathway (including dose-response): ERK phosphorylation was significantly higher in SM + NNK treatment (_2.2-fold difference), as compared with the control or the AOX group (P<0.05)Compared with the control group or the AOX treated group, PCNA expression was significantly higher (36%) in the SM + NNK group (P<0.05)There was higher (50-63%) total p53 protein level in the group exposed to SM + NNK compared with the control group (P<0.05)p53 protein phosphorylation at serine-15 was higher in the groups exposed to SM + NNK (2-fold difference) (P<0.01), compared to controls.Bax protein expression was significantly higher (70%) in the SM + NNK group, compared with the control group (P<0.05. KEYWORDS CLASSIFICATION: alpha-Tocopherol;Aging;Agriculture;Animals;Antioxidants;Ascorbic Acid;bcl-2-Associated X Protein;beta Carotene;Biology;Blotting,Western;Boston;chemically induced;Carcinogens;Chromatography,High Pressure Liquid;drug effects;dietary modulation of carcinogenesis-related pathways;Dietary Supplements;Enzyme Activation;Ferrets;Immunohistochemistry;JNK Mitogen-Activated Protein Kinases;Lung;Lung Neoplasms;metabolism;Mitogen-Activated Protein Kinases;Nitrosamines;pathology;pharmacology;prevention & control;Proliferating Cell Nuclear Antigen;Research;Smoke;toxicity;Tobacco;Tobacco Smoke Pollution;Tretinoin;Tumor Suppressor Protein p53;United States.

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