Research article

CD24 cross-linking induces apoptosis in, and inhibits migration of, MCF-7 breast cancer cells

Jong Bin Kim^{* 1} , Eunyoung Ko^{* 2} , Wonshik Han² , Jeong Eon Lee² , Kyung-Min Lee¹ , Incheol Shin³ , Sangmin Kim⁴ , Jong Won Lee² , Jihyoung Cho² , Ji-Yeon Bae¹ , Hyeon-Gun Jee¹ and Dong-Young Noh^1,2

¹Cancer Research Institute, Seoul National University College of Medicine, 28 Yongon-dong, Chongno-gu, Seoul 110-744, Korea

²Department of Surgery, Seoul National University College of Medicine, 28 Yongon-dong, Chongno-gu, Seoul 110-744, Korea

³Department of Life Science, College of Natural Sciences, Hanyang University, 17 Haengdang-dong, Sungdong-gu, Seoul 133-791, Korea

⁴Clinical Research Institute, Seoul National University College of Medicine, 28 Yongon-dong, Chongno-gu, Seoul 110-744, Korea

author email corresponding author email* Contributed equally

BMC Cancer 2008, 8:118doi:10.1186/1471-2407-8-118

Published:	24 April 2008

Abstract

Background

The biological effects of CD24 (FL-80) cross-linking on breast cancer cells have not yet been established. We examined the impact of CD24 cross-linking on human breast cancer cell line MCF-7.

Methods

MCF-7 and MDA-MB-231 cells were treated with anti-rabbit polyclonal IgG or anti-human CD24 rabbit polyclonal antibodies to induce cross-linking, and then growth was studied. Changes in cell characteristics such as cell cycle modulation, cell death, survival in three-dimensional cultures, adhesion, and migration ability were assayed after CD24 cross-linking in MCF-7.

Results

Expression of CD24 was analyzed by flow cytometry in MDA-MB-231 and MCF-7 cells where 2% and 66% expression frequencies were observed, respectively. CD24 cross-linking resulted in time-dependent proliferation reduction in MCF-7 cells, but no reduction in MDA-MB-231 cells. MCF-7 cell survival was reduced by 15% in three-dimensional culture after CD24 cross-linking. Increased MCF-7 cell apoptosis was observed after CD24 cross-linking, but no cell cycle arrest was observed in that condition. The migration capacity of MCF-7 cells was diminished by 30% after CD24 cross-linking.

Conclusion

Our results showed that CD24 cross-linking induced apoptosis and inhibited migration in MCF-7 breast cancer cells. We conclude that CD24 may be considered as a novel therapeutic target for breast cancer.