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Targeted Expression of c-Src in Epidermal Basal Cells Leads to Enhanced Skin Tumor Promotion, Malignant Progression, and Metastasis¹

Department of Carcinogenesis, University of Texas M. D. Anderson Cancer Center, Science Park-Research Division, Smithville, Texas 78957 [T. M., J. J., K. K., L. R., S. C., L. B., J. D.]; Avalon Pharmaceuticals, Inc., Gaithersburg, Maryland 20878 [D. K. B.]; and Piedmont Research Center, Morrisville, North Carolina 27560 [M. P. R.]

In this study, we generated transgenic mice that overexpressed either a constitutively active human c-src mutant (src⁵³⁰) or a wild-type human c-src (src^wt) in epidermal basal cells driven by human keratin 14 (HK14) or bovine keratin 5 (BK5) promoters, respectively. HK14.src⁵³⁰ transgenic mice developed severe epidermal hyperplasia and hyperkeratosis, and did not survive beyond 3 weeks of age. Four transgenic founders were obtained after injection of a BK5.src^wt construct with variable phenotypes, and three lines (lines A-C) were established. BK5.src^wt founder D exhibited a severe skin phenotype similar to HK14.src⁵³⁰ transgenic mice and died 5 days after birth. Line C transgenic mice also exhibited significant epidermal hyperplasia and hyperkeratosis, and developed spontaneous squamous cell carcinomas (SCCs) of the skin beginning at 3 months of age (70% incidence at 1 year). Mice from lines A and B did not show a marked phenotype; however, elevated human src^wt protein in the epidermis of line B mice was clearly evident. Additional analyses of line B transgenic mice showed an enhanced responsiveness to 12-O-tetradecanoylphorbol-13-acetate-induced epidermal hyperplasia and cell proliferation. Analysis of the susceptibility of line B mice to two-stage skin carcinogenesis revealed that papillomas and SCCs arose earlier and in greater numbers compared with nontransgenic littermates. In addition, malignant conversion occurred more rapidly, and the SCCs that developed in line B transgenic mice had a greater propensity to metastasize to peripheral lymph nodes and other organs. These observations support the hypothesis that c-src plays an important role in skin tumor promotion. In addition, the data show that elevated c-src activity enhances malignant progression and metastasis in this model system.

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