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Pàgina 1 des de 74 resultats
The effect of dietary lipid on skin tumor promotion by benzoyl peroxide: comparison of fish, coconut and corn oil.
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Fish or vegetable oils were fed during the promotion stage of a mouse skin carcinogenesis model in order to investigate the effects of dietary fat on tumor development. Two weeks after initiation with 10 nmol dimethylbenz[a]anthracene, SENCAR mice were divided into five groups and maintained on one
Acceleration of papilloma growth in mice fed high-fat diets during promotion of two-stage skin carcinogenesis.
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The effect of feeding a high-fat diet during the promotion phase of skin tumorigenesis was assessed in SENCAR mice. Tumors were initiated on the backs of mice by application of 10 nmol 7,12-dimethylbenz[a]anthracene (DMBA); the tumors were then promoted beginning one week later with twice weekly
The effect of the level of dietary corn oil on mouse skin carcinogenesis.
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To investigate the effects of two levels of dietary corn oil on tumorigenesis, semipurified diets containing 5% or 10% corn oil were fed during the promotion stage of a mouse skin carcinogenesis model. Sencar mice were initiated with 10 nmol dimethylbenz[a]anthracene (DMBA) and promoted with either
NTP Comparative Toxicology Studies of Corn Oil, Safflower Oil, and Tricaprylin (CAS Nos. 8001-30-7, 8001-23-8, and 538-23-8) in Male F344/N Rats as Vehicles for Gavage.
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The types and levels of fats in the diet are known to affect the incidence of certain neoplasms in humans and rodents. In long-term toxicity and carcinogenicity studies in rodents, the level of dietary fat is altered by using oil as a vehicle to administer unpalatable or volatile chemicals. Control
Toxicology and Carcinogenesis Studies of Furan (CAS No. 110-00-9) in F344 Rats and B6C3F1 Mice(Gavage Studies).
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Furan serves as an intermediate in the synthesis and preparation of numerous linear polymers used to prepare temperature-resistant structural laminates and to prepare copolymers used in machine dishwashing products as alternatives to phosphorus- and nitrogen-containing detergents. Toxicology and
Evaluation of potential human carcinogenicity of the synthetic monomer ethyl acrylate.
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Ethyl acrylate (EA) is an acrylic monomer used in the manufacture of a variety of polymers and copolymers as components of many commercially important products. Human exposure to EA occurs primarily in the workplace via inhalation or dermal contact. In F344 rat and B6C3F(1) mouse studies of EA
Sustainability of forestomach hyperplasia in rats treated with ethyl acrylate for 13 weeks and regression after cessation of dosing.
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In a chronic study conducted by the National Toxicology Program (NTP), gavage administration of 100 or 200 mg ethyl acrylate (EA)/kg/day, 5 days/week, to F344 rats and B6C3F1 mice resulted in a significant dose-dependent increase in the incidence of squamous cell papillomas and carcinomas of the
NTP Toxicology and Carcinogenesis Studies of Dichlorvos (CAS No. 62-73-7) in F344/N Rats and B6C3F1 Mice (Gavage Studies).
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Toxicology and carcinogenesis studies of dichlorvos (99% pure), a contact and stomach poison for control of insects and parasites, were conducted by administering dichlorvos in corn oil by gavage to groups of F344/N rats and B6C3F1 mice of each sex for 13 weeks or 2 years. Previous feed studies were
Chronic toxicology and carcinogenesis studies of Telone II by gavage in Fischer-344 rats and B6C3F1 mice.
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Telone II (technical grade, 1,3-dichloropropene), a soil fumigant, was evaluated in chronic toxicology/carcinogenicity studies using Fischer-344 (F344) rats and B6C3F1 mice of both sexes. Doses administered were 0, 25, or 50 mg/kg to rats and 0, 50, or 100 mg/kg to mice. Telone II was given in corn
NTP Toxicology and Carcinogenesis Studies of Benzaldehyde (CAS No. 100-52-7) in F344/N Rats and B6C3F1 Mice (Gavage Studies).
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Benzaldehyde is an aromatic aldehyde used in the food, beverage, pharmaceutical, perfume, soap, and dyestuff industries. NTP Toxicology and Carcinogenesis studies were conducted by administering benzaldehyde (99% pure) in corn oil by gavage to groups of F344/N rats and B6C3F1 mice of each sex for 16
Toxicology studies of bromodichloromethane (CAS No. 75-27-4) in genetically modified (FVB Tg.AC Hemizygous) mice (dermal, drinking water, and gavage studies) and carcinogenicity studies of bromodichloromethane in genetically modified [B6.129-Trp53(tm1Brd) (N5) haploinsufficient] mice (drinking water and gavage studies).
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Bromodichloromethane is a by-product of the chlorination of drinking water. It is formed by the halogen substitution and oxidation reactions of chlorine and naturally occurring organic matter (e.g., humic or fluvic acids) in water containing bromide. Bromodichloromethane was nominated to the NTP by
Tumor profile of novel p53 heterozygous Tg.AC (v-Ha-ras) bitransgenic mice treated with benzo(a)pyrene and fed dietary N-acetyl-L-cysteine (NAC).
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We designed a novel short-term bitransgenic model to better characterize the effects of benzo(a)pyrene (BP) exposure on multi-organ carcinogenesis and to evaluate the effects of a well-recognized antioxidant, N-acetyl-L-cysteine (NAC), on neoplasia. We selected the p53 heterozygous Tg.AC (v-Ha-ras)
Effects of type and amount of dietary fat on mouse skin tumor promotion.
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In a previous study (Cancer Res 51, 907, 1991) in which we found an inverse relationship between quantity of dietary corn oil and saturated fat, in a constant 15% fat diet, on the tumor promotion stage of skin carcinogenesis, it was not clear whether one or both types of fat played a modulatory
Effects of type of dietary fat on phorbol ester-elicited tumor promotion and other events in mouse skin.
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Based on the biological activity of arachidonic acid metabolites, we hypothesized that alterations in the consumption of linoleic acid, the precursor to arachidonic acid, would result in a modification in tumor development when fed during the tumor promotion stage of the mouse skin
Dietary fat effects on the initiation and promotion of two-stage skin tumorigenesis in the SENCAR mouse.
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We investigated the influence of dietary corn oil on initiation of skin tumors in SENCAR mice with 7,12-dimethylbenz(a)anthracene (DMBA) (10 nmol at 8 to 9 wk of age) and the promotion of these tumors with 12-O-tetradecanoylphorbol-13-acetate (TPA) (3.2 nmol twice weekly for 20 wk). Diet high in
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