The effects of recombinant human BMP-7, prepared from a COS-7 expression system, on the proliferation and differentiation of rat newborn calvarial osteoblasts.
A family of proteins, the bone morphogenetic proteins (BMPs), which promote osteoblast differentiation and bone mineralization, have recently been identified. One, BMP-7, has shown the ability to induce cartilage and bone formation processes. In this report, the possibility that other cell lines, to CHO cells, may also be available as host cells for the expression of hBMP-7 was validated. Recombinant human BMP (rhBMP)-7 was produced in COS-7 cells, as a processed mature disulfide-linked homodimer, with an apparent molecular weight of 36,000. Examination of the expressions of the markers characteristic of osteoblast phenotypes showed that the rhBMP-7 specifically stimulated the inductions of alkaline phosphatase (ALP) (5-fold increase at 100 ng of rhBMP-7/ml), parathyroid hormone (PTH)-mediated intracellular cAMP production (4-fold increase at 100 ng of rhBMP-7/ml) and osteocalcin synthesis (5-fold increase at 100 ng of rhBMP- 7/ml). In summary, the in vitro mineralization assay results provide evidence that the rhBMP-7 peptide, produced by COS-7 expression system, possesses intact biological activity. A similar pattern of biological activity was observed for the BMP-7 in COS-7 cells compared to the corresponding CHO cell expression system. Thus, these findings can be experimentally utilized for the production of rhBMPs for in vitro or in vivo studies.
Lee
Dong Hee
DH
Department of Medical Engineering, Yonsei University College of Medicine, 134 Shinchon-dong, Seodaemun-gu, Seoul 120-752, Korea.
Suh
Hwal
H
Han
Dong Wook
DW
Park
Bong Joo
BJ
Lee
Jin Woo
JW
Park
Jong Chul
JC
D000818:Animals; D000831:Animals, Newborn; D055419:Bone Morphogenetic Protein 7; D019485:Bone Morphogenetic Proteins / Q000494:pharmacology*; D019556:COS Cells; D002454:Cell Differentiation / Q000187:drug effects; D002455:Cell Division / Q000187:drug effects; D002478:Cells, Cultured; D006801:Humans; D010006:Osteoblasts / Q000166:cytology*; D051381:Rats; D017207:Rats, Sprague-Dawley; D011994:Recombinant Proteins / Q000494:pharmacology; D012886:Skull / Q000166:cytology*; D016212:Transforming Growth Factor beta
C525819:BMP7 protein, human; C525821:Bmp7 protein, rat; D055419:Bone Morphogenetic Protein 7; D019485:Bone Morphogenetic Proteins; D011994:Recombinant Proteins; D016212:Transforming Growth Factor beta