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The Korean Journal of Pathology 2001;35(2): 151-157.
Expression of Cyclin D1, Cyclin E, p21Cip1 and p27Kip1 in Chemically Induced Rat Mammary Tumor Treated with Tamoxifen and Transforming Growth Factor-1.
Tae Jung Jang, Jae Hum Park, Mee Yon Cho, Ki Kwon Kim, Jung Ran Kim
1Department of Pathology, Dongguk University College of Medicine, Kyungju 780-714, Korea. taejung@mail.dongguk.ac.kr
2Department of Pathology, Wonju College of Medicine, Yonsei University, Seoul 120-752, Korea.
BACKGROUND: Tamoxifen (TAM) inhibits the action of estrogen by binding to estrogen receptors, and also has non-estrogen receptor mediated cytostatic activities. Transforming growth factor-1 (TGF-1) inhibits the proliferation of many other cell types, such as epithelial, hematopoietic and endothelial cells. METHODS: We investigated the effects of tamoxifen on the growth of 7,12-dimethylbenz(a)anthracene (DMBA)-induced rat mammary tumors and the expression of cyclin D1, cyclin E, p21Cip1, and p27Kip1 by performing immunohistochemistry and Western blot analysis, and studied whether TGF-1 injection amplified the effects of TAM. When tumor size reached between 10-15 mm in the largest dimension, the rats were divided into 3 groups: DMBA-control group (n=12), DMBA-TAM group (n=14) and DMBA-TAM plus TGF-1 group (n=5). RESULTS: The consecutive administration of TAM markedly decreased the tumor development compared with the DMBA-control group. The DMBA-TAM and DMBA-TAM plus TGF-1 groups showed decreased expression of bromodexoyuridine, cyclin D1, cyclin E, and p21Cip1 when compared with those of the DMBA-control group. On the other hand, the labeling index of p27Kip1 was higher in the DMBA-TAM plus TGF-1 group than in the DMBA-control group. CONCLUSION: TAM suppresses tumor development, which may be associated with down-expression of cyclin D1 and cyclin E, and overexpression of p27Kip1, and addition of TGF-1 does not influence tumor development treated by TAM.
Key Words: Breast; Neoplasms; Cell cycle; Tamoxifen; Transforming growth factor beta
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