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. 1997 Jan;17(1):453–459. doi: 10.1128/mcb.17.1.453

Induction of mammary gland hyperplasia and carcinomas in transgenic mice expressing human cyclin E.

D M Bortner 1, M P Rosenberg 1
PMCID: PMC231770  PMID: 8972226

Abstract

Deregulated expression of several cell cycle regulatory genes has been demonstrated to be associated with cancer. In particular, a strong correlation has been established between inappropriate cyclin E expression and human breast cancer. To determine the ability of cyclin E to play a causative role in mammary tumorigenesis, regulatory sequences from the ovine beta-lactoglobulin gene were utilized to specifically target expression of human cyclin E to the mammary glands of pregnant and lactating mice. Lactating mammary glands of transgenic mice expressing cyclin E contained areas of hyperplasia, primarily papillary projections of hyperplastic cells, which were rarely observed in lactating glands of control mice. Over 10% of female cyclin E transgenic mice have developed mammary carcinomas, with latencies ranging from 8 to 13 months. Tumor analysis revealed the presence of transgene-specific cyclin E RNA and protein, as well as cyclin E- and cdk2-associated kinase activity, suggesting that cyclin E is likely a contributing component of tumorigenic progression in this model system.

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Selected References

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