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The mouse mammary tumor virus long terminal repeat directs expression in epithelial and lymphoid cells of different tissues in transgenic mice.

ABSTRACT

A series of transgenic mice was developed that contained the simian virus 40 early region genes under the transcriptional control of the mouse mammary tumor virus long terminal repeat, including the promoter and glucocorticoid response elements. These mice all expressed the transgene in the epithelial cells of a number of different organs, such as lungs, kidneys, and prostate, salivary, and mammary glands, and in Leydig and lymphoid cells. Transcription of the chimeric gene was inducible by glucocorticoids, either after transfection into tissue culture cells or in cells cultured from animals carrying the transgene. Many, but not all, tissues which expressed the simian virus 40 sequences, as determined immunologically and by RNA analysis, developed into tumors, although they showed premalignant features. Since the mouse mammary tumor virus long terminal repeat is expressed in a number of different cell types when inherited through the germ line, the lactating mammary gland-specific transcription of endogenous proviruses must require other factors or sequences to achieve this specificity.

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