We studied the effects of tamoxifen (TAM) on the growth of 7,12-dimethylbenz(a)anthracene (DMBA)-induced rat mammary tumor and the expression of cyclin DI, cyclin E, p21(Cip1), and estrogen receptors (ER) by performing immunohistochemistry and Western blot analysis. When tumor size reached between 10 and 15 nim. in the largest dimension, the rats were divided into a DMBA-control group and a DMBA-TAM group. The administration of TAM markedly decreased the tumor development and showed decreased expression of bromodeoxyuridine, cyclin D1, cyclin E, and p21(Cip1) when compared with those of the DMBA-control group; however, a few tumors showed progressive growth in spite of TAM treatment. These tumors had decreased expression of ER. This study suggests that TAM suppresses tumor development through the down-expression of cyclin D1 and cyclin E. (C) 2001 Elsevier Science Ireland Ltd. All rights reserved.
机构:
Seoul Natl Univ, Coll Med, Dept Pharmacol, Seoul 110799, South KoreaSeoul Natl Univ, Coll Med, Dept Pharmacol, Seoul 110799, South Korea
Lim, Ji-Hong
Lee, Yoon-Mi
论文数: 0引用数: 0
h-index: 0
机构:
Seoul Natl Univ, Coll Med, Dept Pharmacol, Seoul 110799, South KoreaSeoul Natl Univ, Coll Med, Dept Pharmacol, Seoul 110799, South Korea
Lee, Yoon-Mi
Chun, Yang-Sook
论文数: 0引用数: 0
h-index: 0
机构:
Seoul Natl Univ, Coll Med, Dept Physiol, Seoul 110799, South Korea
Seoul Natl Univ, Coll Med, Ischem Hypox Dis Inst, Seoul 110799, South KoreaSeoul Natl Univ, Coll Med, Dept Pharmacol, Seoul 110799, South Korea
Chun, Yang-Sook
Park, Jong-Wan
论文数: 0引用数: 0
h-index: 0
机构:
Seoul Natl Univ, Coll Med, Dept Pharmacol, Seoul 110799, South Korea
Seoul Natl Univ, Coll Med, Ischem Hypox Dis Inst, Seoul 110799, South KoreaSeoul Natl Univ, Coll Med, Dept Pharmacol, Seoul 110799, South Korea