Linked Life Data

19801662

Source:http://linkedlifedata.com/resource/pubmed/id/19801662

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pubmed-article:19801662pubmed:abstractTextBreast cancer commonly metastasizes to bone where its growth depends on the action of bone-resorbing osteoclasts. We have previously shown that breast cancer cells secrete factors able to directly stimulate osteoclastogenesis from receptor activator of nuclear factor kappaB ligand (RANKL)-primed precursors and that transforming growth factor-beta (TGFbeta) plays a permissive role in this process. Now, we evaluate the signaling events triggered in osteoclast precursors by soluble factors produced by MDA-MB-231 human breast carcinoma cells. In mouse bone marrow cultures and RAW 264.7 murine monocytic cells, MDA-MB-231-derived factors increased osteoclast number, size, and nucleation. These factors failed to induce Smad2 phosphorylation, and short interfering RNAs against Smad4 did not affect their ability to induce osteoclastogenesis. In contrast, MDA-MB-231 factors induced phosphorylation of p38 and ERK1/2, and pharmacological inhibitors against p38 (SB203580) and MEK1/2 (PD98059) impeded the osteoclastogenic effects of cancer-derived factors. Neutralizing antibodies against TGFbeta attenuated p38 activation, whereas activation of ERK1/2 was shortened in duration, but not decreased in amplitude. ERK1/2 phosphorylation induced by cancer-derived factors was blocked by MEK1/2 inhibitor, but not by Ras (manumycin A) or Raf (GW5074) inhibitors. Inhibition of protein kinase Calpha using Gö6976 prevented both ERK1/2 phosphorylation and osteoclast formation in response to MDA-MB-231-derived factors. Using microspectrofluorimetry of fura-2-AM-loaded osteoclast precursors, we have found that cancer-derived factors, similar to RANKL, induced sustained oscillations in cytosolic free calcium. The calcium chelator BAPTA prevented calcium elevations and osteoclast formation in response to MDA-MB-231-derived factors. Thus, we have shown that breast cancer-derived factors induce osteoclastogenesis through the activation of calcium/protein kinase Calpha and TGFbeta-dependent ERK1/2 and p38 signaling pathways.lld:pubmed
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pubmed-article:19801662pubmed:year2009lld:pubmed
pubmed-article:19801662pubmed:articleTitleBreast cancer-derived factors stimulate osteoclastogenesis through the Ca2+/protein kinase C and transforming growth factor-beta/MAPK signaling pathways.lld:pubmed
pubmed-article:19801662pubmed:affiliationFaculty of Dentistry, McGill University, Montreal, Quebec H3A 2B2, Canada.lld:pubmed
pubmed-article:19801662pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:19801662pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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