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1 Molecular Imaging Center, Mallinckrodt Institute of Radiology, and 2 Department of Molecular Biology and Pharmacology, Washington University School of Medicine, St. Louis, Missouri; and 3 Department of Chemistry, Washington University, St. Louis, Missouri
The chemokine receptor CXCR4 and its cognate ligand CXCL12 recently have been proposed to regulate the directional trafficking and invasion of breast cancer cells to sites of metastases. However, effects of CXCR4 on the growth of primary breast cancer tumors and established metastases and survival have not been determined. We used stable RNAi to reduce expression of CXCR4 in murine 4T1 cells, a highly metastatic mammary cancer cell line that is a model for stage IV human breast cancer. Using noninvasive bioluminescence and magnetic resonance imaging, we showed that knockdown of CXCR4 significantly limited the growth of orthotopically transplanted breast cancer cells. Mice in which parental 4T1 cells were implanted had progressively enlarging tumors that spontaneously metastasized, and these animals all died from metastatic disease. Remarkably, RNAi of CXCR4 prevented primary tumor formation in some mice, and all mice transplanted with CXCR RNAi cells survived without developing macroscopic metastases. To analyze effects of CXCR4 on metastases to the lung, an organ commonly affected by metastatic breast cancer, we injected tumor cells intravenously and monitored cell growth with bioluminescence imaging. Inhibiting CXCR4 with RNAi, or the specific antagonist AMD3100, substantially delayed the growth of 4T1 cells in the lung, although neither RNAi nor AMD3100 prolonged overall survival in mice with experimental lung metastases. These data indicate that CXCR4 is required to initiate proliferation and/or promote survival of breast cancer cells in vivo and suggest that CXCR4 inhibitors will improve treatment of patients with primary and metastatic breast cancer.
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H. Schabath, S. Runz, S. Joumaa, and P. Altevogt CD24 affects CXCR4 function in pre-B lymphocytes and breast carcinoma cells J. Cell Sci., January 15, 2006; 119(2): 314 - 325. [Abstract] [Full Text] [PDF] |
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R. A. Bartolome, I. Molina-Ortiz, R. Samaniego, P. Sanchez-Mateos, X. R. Bustelo, and J. Teixido Activation of Vav/Rho GTPase Signaling by CXCL12 Controls Membrane-Type Matrix Metalloproteinase-Dependent Melanoma Cell Invasion Cancer Res., January 1, 2006; 66(1): 248 - 258. [Abstract] [Full Text] [PDF] |
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I. Airoldi, L. Raffaghello, E. Piovan, C. Cocco, B. Carlini, A. Amadori, M. V. Corrias, and V. Pistoia CXCL12 Does Not Attract CXCR4+ Human Metastatic Neuroblastoma Cells: Clinical Implications Clin. Cancer Res., January 1, 2006; 12(1): 77 - 82. [Abstract] [Full Text] [PDF] |
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B. M. Woerner, N. M. Warrington, A. L. Kung, A. Perry, and J. B. Rubin Widespread CXCR4 Activation in Astrocytomas Revealed by Phospho-CXCR4-Specific Antibodies Cancer Res., December 15, 2005; 65(24): 11392 - 11399. [Abstract] [Full Text] [PDF] |
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C. Akekawatchai, J. D. Holland, M. Kochetkova, J. C. Wallace, and S. R. McColl Transactivation of CXCR4 by the Insulin-like Growth Factor-1 Receptor (IGF-1R) in Human MDA-MB-231 Breast Cancer Epithelial Cells J. Biol. Chem., December 2, 2005; 280(48): 39701 - 39708. [Abstract] [Full Text] [PDF] |
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B. Guleng, K. Tateishi, M. Ohta, F. Kanai, A. Jazag, H. Ijichi, Y. Tanaka, M. Washida, K. Morikane, Y. Fukushima, et al. Blockade of the Stromal Cell-Derived Factor-1/CXCR4 Axis Attenuates In vivo Tumor Growth by Inhibiting Angiogenesis in a Vascular Endothelial Growth Factor-Independent Manner Cancer Res., July 1, 2005; 65(13): 5864 - 5871. [Abstract] [Full Text] [PDF] |
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