Oncogenicity of K-region epoxides of benzo(A)pyrene and 7,12-dimethylbenz(A)anthracene. 1976

J W Flesher, and R G Harvey, and K L Sydnor

Female Sprague-Dawley rats were given a subcutaneous injection of the parent hydrocarbon or its K-region epoxide in 0.1 ml sesame oil on alternate days to a total of 30 doses and observed for sarcoma at the site of injection for 275 days. The parent compounds, benzo(a)pyrene (0.2 mumole/dose) and 7,12-dimethylbenz(a)anthracene (0.2 mumole/dose), induced sarcoma in 100% of the animals with an average latent period of 101 and 95 days, respectively, whereas five of 12 rats (42%) injected with the K-region epoxide of B(a)P (1.0 mumole/dose), developed sarcoma in 151+/-22 days, and the K-region epoxide of DMBA (0.4 mumole/dose) failed to elicit tumors. Under these experimental conditions, these K-region epoxides are, at best, only weak carcinogens.

UI MeSH Term Description Entries
D007279 Injections, Subcutaneous Forceful administration under the skin of liquid medication, nutrient, or other fluid through a hollow needle piercing the skin. Subcutaneous Injections,Injection, Subcutaneous,Subcutaneous Injection
D002273 Carcinogens Substances that increase the risk of NEOPLASMS in humans or animals. Both genotoxic chemicals, which affect DNA directly, and nongenotoxic chemicals, which induce neoplasms by other mechanism, are included. Carcinogen,Oncogen,Oncogens,Tumor Initiator,Tumor Initiators,Tumor Promoter,Tumor Promoters,Initiator, Tumor,Initiators, Tumor,Promoter, Tumor,Promoters, Tumor
D005260 Female Females
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
D001551 Benz(a)Anthracenes Four fused benzyl rings with three linear and one angular, that can be viewed as a benzyl-phenanthrenes. Compare with NAPHTHACENES which are four linear rings. Benz(b)Phenanthrenes,Naphthanthracenes
D001580 Benzopyrenes A class of chemicals that contain an anthracene ring with a naphthalene ring attached to it. Benzpyrene
D012513 Sarcoma, Experimental Experimentally induced neoplasms of CONNECTIVE TISSUE in animals to provide a model for studying human SARCOMA. EHS Tumor,Sarcoma, Engelbreth-Holm-Swarm,Sarcoma, Jensen,Experimental Sarcoma,Experimental Sarcomas,Sarcomas, Experimental,Engelbreth-Holm-Swarm Sarcoma,Jensen Sarcoma,Sarcoma, Engelbreth Holm Swarm,Tumor, EHS
D013997 Time Factors Elements of limited time intervals, contributing to particular results or situations. Time Series,Factor, Time,Time Factor
D015127 9,10-Dimethyl-1,2-benzanthracene Polycyclic aromatic hydrocarbon found in tobacco smoke that is a potent carcinogen. 7,12-Dimethylbenzanthracene,7,12-Dimethylbenz(a)anthracene,7,12 Dimethylbenzanthracene
D051381 Rats The common name for the genus Rattus. Rattus,Rats, Laboratory,Rats, Norway,Rattus norvegicus,Laboratory Rat,Laboratory Rats,Norway Rat,Norway Rats,Rat,Rat, Laboratory,Rat, Norway,norvegicus, Rattus

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