1. Tumor-derived CCL5 does not contribute to breast cancer progression.
- Author
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Jayasinghe MM, Golden JM, Nair P, O'Donnell CM, Werner MT, and Kurt RA
- Subjects
- Animals, Cell Line, Tumor, Cell Proliferation, Chemokine CCL5 genetics, Disease Progression, Female, Gene Expression Regulation, Neoplastic, Histocompatibility Antigens metabolism, Mammary Neoplasms, Animal genetics, Mammary Neoplasms, Animal pathology, Mice, Mice, Inbred BALB C, Neoplasm Metastasis, RNA Interference, RNA, Small Interfering metabolism, Time Factors, Transfection, Chemokine CCL5 metabolism, Mammary Neoplasms, Animal immunology
- Abstract
Besides functioning as a chemotactic factor, CCL5 has been associated with progression of disease in women with breast cancer, immune modulation and metastasis. Here we asked whether CCL5 produced by tumor cells contributed to growth or metastasis of breast cancer. For this purpose, we used two murine mammary carcinomas, the 4T1 tumor which is metastatic and constitutively expresses CCL5, and the 168 tumor which is not metastatic and does not constitutively express CCL5. RNA interference was used to inhibit CCL5 expression from the 4T1 tumor, and a CCL5 transgene was used to express CCL5 by the 168 tumor. Six different clones of 4T1 that exhibited stable reduction in CCL5 expression, and three different clones of 168 that exhibited stable CCL5 expression were compared to the parental tumors and vector transfected controls. Significantly, in both models, tumor-derived CCL5 expression did not correlate with MHC expression, growth rate, or metastatic ability of the tumors. These results show that tumor-derived CCL5 expression alone does not make a significant contribution to breast cancer progression.
- Published
- 2008
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