Chinanart Boonleang. Effects of Alendronate, Tibolone, Raloxifene, and Dehydroepiandrosterone on proliferation of MCF-7 human breast cancer cells. Master's Degree(Pharmacology). Mahidol University. : Mahidol University, 2005.
Effects of Alendronate, Tibolone, Raloxifene, and Dehydroepiandrosterone on proliferation of MCF-7 human breast cancer cells
Abstract:
without osteoporosis. Several drugs have been commonly used for treatment of that such as estrogens, estrogens with progestins, tibolone, bisphosphonates and selective estrogen receptor modulators (SERMs). Dehydroepiandrosterone (DHEA), the precursor of estrogen and testosterone, has sometimes also been used for relieving the climacteric symptoms. Whether these drugs would affect the proliferation of estrogen receptor positive breast cancer cells and/or interfere with proliferation inhibitory effect on these cells of the aromatase inhibitor were the aims of this study. This study investigated the in vitro effects of alendronate, tibolone, raloxifene and DHEA at concentrations of 10-10-10-4 M on the proliferation of the MCF-7 human breast cancer cells in the presence and absence of 10-8 M 17β-estradiol, and 10-8 M anastrozole. The proliferative effects of test compounds on MCF-7 cells were determined on day 2 and day 6 by the MTT method, and the cytotoxic effects were determined on day 2 by the LDH method. In addition, morphological changes were determined on day 2 and day 6 by phase contrast inverted microscope and benzimidazole (Ho33342) staining. The results indicated that the four drugs at concentrations of 10-8-10-4 M had antiproliferative effects, induced cell death and induced apoptosis. In addition, these compounds, in combination with 17β-estradiol and anastrozole, could reduce growth-promoting effect of 17β-estradiol and enhance the growth-inhibitory effect of anastrozole. Additionally, when the antiproliferative effects of these four compounds were compared with that of progesterone, the potency order on day 2 was tibolone > raloxifene > progesterone > alendronate > DHEA and on day 6 was progesterone > tibolone > raloxifene > alendronate > DHEA. From these findings probably lead to a suggestion that the four drugs may neither increase the risk of breast cancer nor decrease the potency of anastrozole. In conclusion, alendronate, tibolone, raloxifene and DHEA may provide the beneficial effects to postmenopausal patients with severe climacteric complaints and osteoporosis, especially those with a positive family history of breast cancer and for breast cancer survivors"