Abstract
The bone microenvironment plays a critical role in tumor-induced osteolysis and osteolytic metastasis through tumor–bone (TB)-interaction. Receptor activator of nuclear factor-κB (RANK) ligand (RANKL) is one of the critical signaling molecules involved in osteolysis and bone metastasis. However, the regulation and functional significance of RANKL at the TB-interface in tumor-induced osteolysis remains unclear. In this report, we examined the role of tumor–stromal interaction in the regulation of RANKL expression and its functional significance in tumor-induced osteolysis. Using a novel mammary tumor model, we identified that RANKL expression was upregulated at the TB-interface as compared to the tumor alone area. We demonstrate increased generation of sRANKL at the TB-interface, which is associated with tumor-induced osteolysis. The ratio of RANKL to osteoprotegrin (OPG), a decoy receptor for RANKL, at the TB-interface was also increased. Targeting RANKL expression with antisense oligonucleotides (RANKL-ASO), significantly abrogated tumor-induced osteolysis, decreased RANKL expression and the RANKL:OPG ratio at the TB-interface. Together, these results demonstrate that upregulation of RANKL expression and sRANKL generation at the TB-interface potentiates tumor-induced osteolysis.
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Acknowledgments
This work was supported in part by grants CA72781 (R.K.S.) and Cancer Center Support Grant (P30CA036727) from National Cancer Institute, National Institutes of Health, Susan G. Komen for the Cure grant KG090860 and Nebraska Research Initiative Program in Cancer Glycobiology (R.K.S.), Department of Defense Breast Cancer Research Program Predoctoral traineeship award (K.C.N) and the Howard Hughes Medical Institute Research Training Fellowship (T.J.W.). We thank Dr. James Eudy and the UNMC DNA Microarray Core Facility for help in microarray analysis.
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Nannuru, K.C., Futakuchi, M., Sadanandam, A. et al. Enhanced expression and shedding of receptor activator of NF-κB ligand during tumor–bone interaction potentiates mammary tumor-induced osteolysis. Clin Exp Metastasis 26, 797–808 (2009). https://doi.org/10.1007/s10585-009-9279-2
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DOI: https://doi.org/10.1007/s10585-009-9279-2