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The acronym SENCAR is derived from SENsitivity to CARcinogenesis. SENCAR mice are commonly used for studies of susceptibility and resistance to the induction of skin tumors. Dr. Michael Potter of the National Cancer Institute developed three inbred lines, designated A, B, and C, from random breeding of outbred SENCAR mice. Characterization of these mice for sensitivity to skin tumor development indicated that mice of all three inbred strains displayed increased sensitivity to initiation by 7,12-dimethylbenz[a]anthracene (DMBA), urethane, or N-methyl-N'-nitro-N-nitrosoguanidine (MNNG) and promotion by 12-O-tetradecanoylphorbol-13-acetate (TPA). Promotion by mezerein as well as carcinogenesis by repeated treatment with DMBA or MNNG produced papillomas with a high frequency of conversion to squamous cell carcinomas (SCCs). Compared with outbred SENCAR mice, development of both squamous papillomas and carcinomas was increased at least two-fold by all protocols tested. NCI received these mice in 1989. |
