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Enhancement of carcinogen-induced mutations or recombinations by 12-O-tetradecanoyl-phorbol-13-acetate in the mammalian spot test. 1987

R Fahrig

The mammalian spot test is suitable for detecting gene mutations and reciprocal recombinations. When given alone 12-O-tetradecanoyl-phorbol-13-acetate (TPA) did not have any statistically significant effect upon these genetic alterations. In combination with ethylnitrosourea (ENU) however TPA enhanced the effect of the mutagen/carcinogen. The effective dose range of TPA + ENU was very small, i.e., between 2 X 0.2 and 2 X 0.33 mg/kg, but the effect was very strong as shown by the steep slope of the dose-effect curve. The results agree with the hypothesis that the mode of action of cocarcinogens and tumor promoters is a genetic one and that recombination plays an important role in this process.

UI MeSH Term Description Entries
D009152 Mutagenicity Tests Tests of chemical substances and physical agents for mutagenic potential. They include microbial, insect, mammalian cell, and whole animal tests. Genetic Toxicity Tests,Genotoxicity Tests,Mutagen Screening,Tests, Genetic Toxicity,Toxicity Tests, Genetic,Genetic Toxicity Test,Genotoxicity Test,Mutagen Screenings,Mutagenicity Test,Screening, Mutagen,Screenings, Mutagen,Test, Genotoxicity,Tests, Genotoxicity,Toxicity Test, Genetic
D009154 Mutation Any detectable and heritable change in the genetic material that causes a change in the GENOTYPE and which is transmitted to daughter cells and to succeeding generations. Mutations
D011995 Recombination, Genetic Production of new arrangements of DNA by various mechanisms such as assortment and segregation, CROSSING OVER; GENE CONVERSION; GENETIC TRANSFORMATION; GENETIC CONJUGATION; GENETIC TRANSDUCTION; or mixed infection of viruses. Genetic Recombination,Recombination,Genetic Recombinations,Recombinations,Recombinations, Genetic
D004305 Dose-Response Relationship, Drug The relationship between the dose of an administered drug and the response of the organism to the drug. Dose Response Relationship, Drug,Dose-Response Relationships, Drug,Drug Dose-Response Relationship,Drug Dose-Response Relationships,Relationship, Drug Dose-Response,Relationships, Drug Dose-Response
D004357 Drug Synergism The action of a drug in promoting or enhancing the effectiveness of another drug. Drug Potentiation,Drug Augmentation,Augmentation, Drug,Augmentations, Drug,Drug Augmentations,Drug Potentiations,Drug Synergisms,Potentiation, Drug,Potentiations, Drug,Synergism, Drug,Synergisms, Drug
D005038 Ethylnitrosourea A nitrosourea compound with alkylating, carcinogenic, and mutagenic properties. Nitrosoethylurea,N-Ethyl-N-nitrosourea,N Ethyl N nitrosourea
D005796 Genes A category of nucleic acid sequences that function as units of heredity and which code for the basic instructions for the development, reproduction, and maintenance of organisms. Cistron,Gene,Genetic Materials,Cistrons,Genetic Material,Material, Genetic,Materials, Genetic
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D012880 Skin Pigmentation Coloration of the skin. Skin Color,Skin Tone,Color, Skin,Colors, Skin,Pigmentation, Skin,Pigmentations, Skin,Skin Colors,Skin Pigmentations,Skin Tones,Tone, Skin,Tones, Skin
D013755 Tetradecanoylphorbol Acetate A phorbol ester found in CROTON OIL with very effective tumor promoting activity. It stimulates the synthesis of both DNA and RNA. Phorbol Myristate Acetate,12-Myristoyl-13-acetylphorbol,12-O-Tetradecanoyl Phorbol 13-Acetate,Tetradecanoylphorbol Acetate, 4a alpha-Isomer,12 Myristoyl 13 acetylphorbol,12 O Tetradecanoyl Phorbol 13 Acetate,13-Acetate, 12-O-Tetradecanoyl Phorbol,Acetate, Phorbol Myristate,Acetate, Tetradecanoylphorbol,Myristate Acetate, Phorbol,Phorbol 13-Acetate, 12-O-Tetradecanoyl,Tetradecanoylphorbol Acetate, 4a alpha Isomer

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