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Conditional Loss of Uterine Pten Unfailingly and Rapidly Induces Endometrial Cancer in Mice

Departments of ¹ Pediatrics, ² Cell and Developmental Biology, and ³ Pharmacology, Division of Reproductive and Developmental Biology, Vanderbilt University Medical Center, Nashville, Tenessee; ⁴ Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, Texas; and ⁵ Department of Pathology and Laboratory Medicine, New York Presbyterian Hospital-Weill Medical College of Cornell University, New York, New York

Requests for reprints: Takiko Daikoku or Sudhansu K. Dey, Vanderbilt University, 1161 21st Avenue South, Nashville, TN 37232. Phone: 615-322-8642; Fax: 615-822-4794; E-mail: takiko.daikoku{at}cchmc.org or sk.dey{at}vanderbilt.edu.

Key Words: endometrial cancer • mouse model • Pten • p53 • Cox-2

Etiology of endometrial cancer (EMC) is not fully understood. Animal models with rapidly and spontaneously developing EMC will help explore mechanisms of cancer initiation and progression. Pten^+/– mice are currently being used as a model to study EMC. These females develop atypical endometrial hyperplasia of which 20% progresses to EMC. In addition, tumors develop in other organs, complicating the use of this model to specifically study EMC. Here, we show that conditional deletion of endometrial Pten results in EMC in all female mice as early as age 1 month with myometrial invasion occurring by 3 months. In contrast, conditional deletion of endometrial p53 had no phenotype within this time frame. Whereas mice with endometrial Pten deletion had a life span of 5 months, mice with combined deletion of endometrial Pten and p53 had a shorter life span with an exacerbated disease state. Such rapid development of EMC from homozygous loss of endometrial Pten suggests that this organ is very sensitive to this tumor suppressor gene for tumor development. All lesions at early stages exhibited elevated Cox-2 and phospho-Akt levels, hallmarks of solid tumors. More interestingly, levels of two microRNAs miR-199a^* and miR-101a that posttranscriptionally inhibit Cox-2 expression were down-regulated in tumors in parallel with Cox-2 up-regulation. This mouse model in which the loxP-Cre system has been used to delete endometrial Pten and/or p53 allows us to study in detail the initiation and progression of EMC. These mouse models have the added advantage because they mimic several features of human EMC. [Cancer Res 2008;68(14):5619–27]

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