Role of ascorbic acid in the osteoclast formation: induction of osteoclast differentiation factor with formation of the extracellular collagen matrix.
Osteoclasts are bone-resorbing multinucleated cells. Tartrate-resistant acid phosphatase-positive (TRAP-positive) mononuclear and multinucleated cells, which are osteoclast-like cells (OCLs), were formed as a result of the coculture of mouse bone marrow cells and clonal stromal ST2 cells in the presence of 1alpha,25-dihydroxy-vitamin D3. Removal of ascorbic acid from the culture medium prevented the formation of TRAP-positive OCLs. Addition of ascorbic acid to the medium formed TRAP-positive OCLs, and the effect of ascorbic acid was dose-dependent. When we examined the level of messenger RNA (mRNA) for osteoclast differentiation factor (RANKL/ODF) in ST2 cells, we found that ascorbic acid caused an approximately 5-fold increase in the level of this mRNA. The half-life of the mRNA was unaffected by ascorbic acid. To characterize the mechanism of action of ascorbic acid, we investigated the relationship between formation of TRAP-positive OCLs and formation of the collagen matrix. Inhibitors of the formation of collagen triple helices blocked both the formation of TRAP-positive OCLs and the expression of the mRNA for RANKL/ODF in response to ascorbic acid. Our findings suggest that ascorbic acid might be essential for osteoclastogenesis and might induce the formation of TRAP-positive OCLs via induction of the synthesis of RANKL/ODF that is somehow mediated by the extracellular matrix.
Research Center for Experimental Biology, Tokyo Institute of Technology, Yokohama, Japan.
E
E
Otsuka
Y
Y
Kato
S
S
Hirose
H
H
Hagiwara
D000818:Animals; D001205:Ascorbic Acid / Q000494:pharmacology / Q000502:physiology*; D001854:Bone Marrow Cells / Q000166:cytology / Q000378:metabolism; D002117:Calcitriol / Q000494:pharmacology; D002352:Carrier Proteins / Q000096:biosynthesis* / Q000235:genetics; D002454:Cell Differentiation; D018920:Coculture Techniques; D003094:Collagen / Q000378:metabolism*; D005109:Extracellular Matrix / Q000378:metabolism*; D015870:Gene Expression / Q000187:drug effects; D008297:Male; D008562:Membrane Glycoproteins / Q000096:biosynthesis* / Q000235:genetics; D051379:Mice; D010010:Osteoclasts / Q000166:cytology* / Q000378:metabolism; D053245:RANK Ligand; D012333:RNA, Messenger / Q000032:analysis / Q000378:metabolism; D053246:Receptor Activator of Nuclear Factor-kappa B; D020133:Reverse Transcriptase Polymerase Chain Reaction; D017154:Stromal Cells
D002352:Carrier Proteins; 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; D003094:Collagen; D002117:Calcitriol; D001205:Ascorbic Acid