Publication de 6 numéros par an
ISSN Imprimer: 1045-4403
ISSN En ligne: 2162-6502
Indexed in
Anti-Osteoactivin Antibody Inhibits Osteoblast Differentiation and Function In Vitro
RÉSUMÉ
Osteoactivin (OA) is a novel protein identified by mRNA differential display using bone from osteopetrotic versus normal rats. Bioinformatic analysis showed that OA cDNA has an open reading frame of 1716 bp encoding a protein of 572 aa, the first 21 aa constitute a signal peptide. OA sequence analysis also demonstrated 13 putative N-glycosylation sites suggestive of a heavily glycosylated protein. In this study, we localized OA protein in primary osteoblast culture by immunofluorescent staining and Western blot analysis. Primary osteoblast cultures pass through three stages: proliferation from day 1 to 7, matrix formation from day 7 to 14, and matrix mineralization from day 14 to 21. OA protein was detected at all stages examined, with maximal expression at 3 weeks when osteoblasts are terminally differentiated. Using the Chariot transfection reagent as a vehicle to deliver anti-OA antibody into the cells, we demonstrated that anti-OA antibody significantly inhibited osteoblast differentiation markers, including alkaline phosphatase activity, nodule formation, osteocalcin production, and calcium deposition, without affecting cell proliferation or viability. These data suggest that OA is an osteoblast-related protein that plays an important role in the regulation of osteoblast differentiation and function.
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