title: Effects of recombinant human bone morphogenetic protein-2 on human bone marrow cells cultured with various biomaterials.
abstract: Recombinant human bone morphogenetic protein-2 (rhBMP-2) is known to induce orthotopic and ectopic bone formation in vivo. Several in vitro studies using rat or mouse clonal cell lines have shown that rhBMP-2 may be involved in the differentiation of osteoblasts from osteoblast precursor cells or stromal cells in the bone marrow. However, there is little information available about the effects of rhBMP-2 on cultured human bone marrow cells. We investigated the effects of rhBMP-2 cultured on human bone marrow cells and osteoblastic cells on various biomaterials. Human bone cells were divided into fresh bone marrow cells, fibroblast colony-forming units (cfu-F, stromal precursors), and osteoblastic cells. The cells were cultured with or without rhBMP-2 on various biomaterials, including titanium alloy, pure titanium, cobalt alloy, and hydroxyapatite. It was found that rhBMP-2 (500 ng/mL) significantly stimulated alkaline phosphatase production by fresh bone marrow cells and cfu-F. However, when cultured on titanium alloy or pure titanium, only fresh bone marrow cells showed an increase of alkaline phosphatase production after rhBMP-2 stimulation. Production of osteocalcin, a marker of mature osteoblasts, was not stimulated by rhBMP-2 in any combinations tested. These findings suggest that rhBMP-2 may be involved in inducing the differentiation of osteoblast precursor cells into osteoblastic cells rather than stimulating further differentiation of osteoblastic cells into mature osteoblasts. In addition, grafts of fresh human bone marrow cells of cfu-F stimulated by rhBMP-2 may have the potential to promote bone formation at sites of nonunion as well as around titanium joint prostheses.
authors.affiliation: Department of Orthopaedic Surgery, Tokyo Women's Medical College, Japan.
authors.forename: K J
authors.initials: KJ
authors.lastname: Kim
authors.forename: T
authors.initials: T
authors.lastname: Itoh
authors.forename: S
authors.initials: S
authors.lastname: Kotake
mesh_terms: D000328:Adult; D000469:Alkaline Phosphatase / Q000096:biosynthesis; D000497:Alloys; D000818:Animals; D001672:Biocompatible Materials; D001854:Bone Marrow Cells; D055396:Bone Morphogenetic Protein 2; D019485:Bone Morphogenetic Proteins / Q000494:pharmacology*; D018929:Cell Culture Techniques / Q000379:methods; D003035:Cobalt; D003114:Colony-Forming Units Assay; D017886:Durapatite; D006412:Hematopoietic Stem Cells / Q000166:cytology* / Q000187:drug effects / Q000201:enzymology; D006801:Humans; D051379:Mice; D008875:Middle Aged; D010006:Osteoblasts / Q000166:cytology* / Q000187:drug effects / Q000201:enzymology; D051381:Rats; D011994:Recombinant Proteins / Q000494:pharmacology; D017154:Stromal Cells / Q000166:cytology; D014025:Titanium; D016212:Transforming Growth Factor beta
chemical_list: D000497:Alloys; C525718:BMP2 protein, human; D001672:Biocompatible Materials; C525719:Bmp2 protein, mouse; C525720:Bmp2 protein, rat; D055396:Bone Morphogenetic Protein 2; D019485:Bone Morphogenetic Proteins; D011994:Recombinant Proteins; D016212:Transforming Growth Factor beta; C499469:recombinant human bone morphogenetic protein-2; D003035:Cobalt; D017886:Durapatite; D014025:Titanium; D000469:Alkaline Phosphatase