Receptor activator of NF-kappaB ligand enhances breast cancer-induced osteolytic lesions through upregulation of extracellular matrix metalloproteinase inducer/CD147

Cancer Research
Nadia RucciVincenza Dolo

Abstract

Breast cancer shows a strong predilection to metastasize to bone. Cell surface glycoprotein extracellular matrix metalloproteinase inducer (EMMPRIN)/CD147 induces metalloproteinases (MMP) and vascular endothelial growth factor (VEGF), which may support osteoclastic activity and increased incidence of breast cancer bone metastases. In support of this hypothesis, we observed that MDA-MB-231 human breast tumor cells engineered to overexpress EMMPRIN strongly induced osteolytic lesions in immunodeficient mice, which was blunted by in vivo treatment with an EMMPRIN blocking antibody. Similarly, these cells exhibited increased expression of MMP-9 and VEGF relative to control cells. Treatment of MDA-MB-231 cells with the osteoclastogenic cytokine receptor activator of NF-kappaB ligand (RANKL) upregulated EMMPRIN expression with a parallel increase of MMP-9 and VEGF. Conditioned medium from osteoblasts similarly increased EMMPRIN, MMP-9, and VEGF expression in cells. Osteoblast treatment with the RANKL decoy receptor osteoprotegerin abolished this effect. EMMPRIN overexpression stimulated MDA-MB-231 cell invasion but not proliferation. Conversely, small interfering RNA-mediated knockdown of EMMPRIN downregulated MMP-9 and VEGF basal ex...Continue Reading

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