BioMed Research International

BioMed Research International / 2005 / Article

Research article | Open Access

Volume 2005 |Article ID 768454 |

J. M. Xanthopoulos, A. E. Romano, S. K. Majumdar, "Response of Mouse Breast Cancer Cells to Anastrozole, Tamoxifen, and the Combination", BioMed Research International, vol. 2005, Article ID 768454, 10 pages, 2005.

Response of Mouse Breast Cancer Cells to Anastrozole, Tamoxifen, and the Combination

Received17 May 2004
Accepted23 Aug 2004


The murine breast cancer cells (4T1) grown both in female BALB/c mice and in culture were treated with anastrozole (50 μg/mL), tamoxifen citrate (5 μg/mL), and the combination of the two drugs in order to determine treatment efficacies, toxic potential, and the mechanism of cell death. The in vivo treatments were evaluated by monitoring tumor growth, development, and life span. The in vitro effects were measured through cell growth kinetics, cell proliferation, mitochondrial membrane potential disruption assay, and light and scanning electron microscopy. All drug treatments extended the mean life span of the 4T1-inoculated tumor-bearing mice; however, only tamoxifen and combination treatments statistically increased the life span when compared to untreated mice. Although the most drug inhibitory effect on cell multiplication was observed in the combination treatment, both anastrozole and tamoxifen individually inhibited cell proliferation significantly at most time periods in this mouse breast cancer cell line. The mitochondrial membrane potential disruption assay demonstrated significant increase in the percent of cells undergoing apoptosis in all treatment groups. However, the combination treatment was the most effective in inducing cell death via apoptosis. Light and scanning electron microscopy of the treated cells revealed characteristics such as rounding, clumping, and shrinkage of the cells as well as formation of cell surface blebbing and apoptotic bodies suggestive of cell death via apoptotic pathway.

Copyright © 2005 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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