title: Treatment of myoblastic C2C12 cells with BMP-2 stimulates vitamin D-induced formation of osteoclasts.
abstract: The interaction of osteoclast precursors with osteoblasts and/or stromal cells is essential for the formation of mature osteoclasts and the resorption of bone. We found that myoblastic C2C12 cells induced the differentiation of mouse spleen cells into tartrate-resistant acid phosphatase-positive (TRAP-positive) multinucleated cells in the presence of 10(-7) M 1alpha,25-dihydroxyvitamin D3 [1alpha,25(OH)2D3] and that C2C12 cells that had been treated with bone morphogenetic protein-2 (BMP-2) dose-dependently stimulated the formation of osteoclasts. The newly developed TRAP-positive multinucleated cells were capable of resorbing mineralized tissues. Treatment of C2C12 cells with BMP-2 for 24 h enhanced the subsequent expression in C2C12 cells of mRNA for the receptor activator of nuclear factor-kappaB ligand (RANKL) in the presence of 1alpha,25(OH)2D3. Since the formation of osteoclasts was inhibited dose-dependently by exogenous OPG, the expression of RANKL in response to BMP-2 appeared to be critical for the formation of osteoclasts. Our findings suggest that BMP-2 might play an important role in the differentiation of cells that support osteoclastogenesis.
mesh_terms: D000135:Acid Phosphatase / Q000378:metabolism; D000818:Animals; D055396:Bone Morphogenetic Protein 2; D019485:Bone Morphogenetic Proteins / Q000494:pharmacology*; D002352:Carrier Proteins / Q000096:biosynthesis / Q000235:genetics; D002454:Cell Differentiation / Q000187:drug effects; D002460:Cell Line; D004305:Dose-Response Relationship, Drug; D004338:Drug Combinations; D015726:Giant Cells / Q000187:drug effects / Q000201:enzymology; D007527:Isoenzymes / Q000378:metabolism; D008297:Male; D008562:Membrane Glycoproteins / Q000096:biosynthesis / Q000235:genetics; D051379:Mice; D008815:Mice, Inbred Strains; D032446:Myoblasts / Q000187:drug effects* / Q000201:enzymology; D010010:Osteoclasts / Q000187:drug effects* / Q000201:enzymology; D053245:RANK Ligand; D012333:RNA, Messenger / Q000378:metabolism; D053246:Receptor Activator of Nuclear Factor-kappa B; D000071681:Tartrate-Resistant Acid Phosphatase; D016212:Transforming Growth Factor beta / Q000494:pharmacology*; D014807:Vitamin D / Q000031:analogs & derivatives* / Q000494:pharmacology*
chemical_list: C116441:2-methyl-1,25-dihydroxyvitamin D3; C525719:Bmp2 protein, mouse; D055396:Bone Morphogenetic Protein 2; D019485:Bone Morphogenetic Proteins; D002352:Carrier Proteins; D004338:Drug Combinations; D007527:Isoenzymes; D008562:Membrane Glycoproteins; D053245:RANK Ligand; D012333:RNA, Messenger; D053246:Receptor Activator of Nuclear Factor-kappa B; C505687:Tnfrsf11a protein, mouse; C505689:Tnfsf11 protein, mouse; D016212:Transforming Growth Factor beta; D014807:Vitamin D; D000135:Acid Phosphatase; C000605511:Acp5 protein, mouse; D000071681:Tartrate-Resistant Acid Phosphatase