Abstract
We compared the effect of conditioned medium (CM) from several human breast carcinoma cell lines on osteoclast bone resorbing activity and osteoclast apoptosis. Our findings indicate that ability of cancer cell line to increase the in vitro bone resorbing activity is linked to their potential to inhibit osteoclast apoptosis. Cancer cells producing the higher level of M-CSF have the higher osteolytic activity, suggesting that M-CSF originating from cancer cells may contribute, at least in part, to the osteoclast activity at the metastatic site by enhancing their survival. Given that M-CSF plays an important role in the anti-apoptotic effect, we speculated that blocking M-CSF pathway would prevent the CM effects. Small interfering RNA (siRNA) targeting M-CSF and imatinib, a protein tyrosine kinase inhibitor targeting M-CSF receptor, almost completely reversed the CM effect on both osteoclast apoptosis and bone resorption. Blockade of M-CSF pathway could be thus of clinical value in the treatment of breast cancer related bone destruction.
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Abbreviations
- M-CSF:
-
macrophage-colony stimulating factor
- CM:
-
conditioned media
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Gallet, M., Mentaverri, R., Sévenet, N. et al. Ability of breast cancer cell lines to stimulate bone resorbing activity of mature osteoclasts correlates with an anti-apoptotic effect mediated by macrophage colony stimulating factor. Apoptosis 11, 1909–1921 (2006). https://doi.org/10.1007/s10495-006-9507-z
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DOI: https://doi.org/10.1007/s10495-006-9507-z