title: 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.
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.
authors.affiliation: Unité d'Etude des Mécanismes de la Résorption Osseuse (UMRO), UPRES-EA 2086, Faculté de Pharmacie, 1, rue des Louvels, 80037, Amiens Cedex, France. marlene.gallet@u-picardie.fr
authors.forename: Marlène
authors.initials: M
authors.lastname: Gallet
authors.forename: Romuald
authors.initials: R
authors.lastname: Mentaverri
authors.forename: Nicolas
authors.initials: N
authors.lastname: Sévenet
authors.forename: Michel
authors.initials: M
authors.lastname: Brazier
authors.forename: Saïd
authors.initials: S
authors.lastname: Kamel
mesh_terms: D000818:Animals; D017209:Apoptosis / Q000187:drug effects; D001549:Benzamides; D001862:Bone Resorption / Q000378:metabolism*; D001943:Breast Neoplasms / Q000378:metabolism*; D045744:Cell Line, Tumor; D017077:Culture Media, Conditioned; D006801:Humans; D000068877:Imatinib Mesylate; D016173:Macrophage Colony-Stimulating Factor / Q000235:genetics / Q000378:metabolism*; D010010:Osteoclasts / Q000166:cytology* / Q000378:metabolism; D010879:Piperazines / Q000494:pharmacology; D047428:Protein Kinase Inhibitors / Q000494:pharmacology; D011743:Pyrimidines / Q000494:pharmacology; D034741:RNA, Small Interfering; D011817:Rabbits
chemical_list: D001549:Benzamides; D017077:Culture Media, Conditioned; D010879:Piperazines; D047428:Protein Kinase Inhibitors; D011743:Pyrimidines; D034741:RNA, Small Interfering; D016173:Macrophage Colony-Stimulating Factor; D000068877:Imatinib Mesylate