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Ell, Brian; Mercatali, Laura; Ibrahim, Toni; Campbell, Neil; Schwarzenbach, Heidi; Pantel, Klaus; Amadori, Dino; Kang, Yibin
Cancer cell, 10/2013, Volume: 24, Issue: 4Journal Article
Understanding the mechanism by which tumor cells influence osteoclast differentiation is crucial for improving treatment of osteolytic metastasis. Here, we report broad microRNA (miRNA) expression changes in differentiating osteoclasts after exposure to tumor-conditioned media, in part through activation of NFκB signaling by soluble intracellular adhesion molecule (sICAM1) secreted from bone-metastatic cancer cells. Ectopic expression of multiple miRNAs downregulated during osteoclastogenesis suppresses osteoclast differentiation by targeting important osteoclast genes. Intravenous delivery of these miRNAs in vivo inhibits osteoclast activity and reduces osteolytic bone metastasis. Importantly, serum levels of sICAM1 and two osteoclast miRNAs, miR-16 and miR-378, which are elevated in osteoclast differentiation, correlate with bone metastasis burden. These findings establish miRNAs as potential therapeutic targets and clinical biomarkers of bone metastasis. Display omitted •Consistent miRNA changes in physiological and pathological osteoclastogenesis•MiR-141 and miR-219 inhibit osteoclastogenesis by targeting osteoclast genes•sICAM1 enhances osteoclastogenesis via β2 integrin-mediated NFκB signaling•Elevated serum miR-16, miR-378, and sICAM1 levels correlate with bone metastasis
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