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• W2047804938 abstract "In Brief Study Design. The study involves an in vitro experiment using human ligamentum flavum (LF), adenovirus lacZ construct (Ad/lacZ), and recombinant human bone morphogenetic protein-2 (BMP-2). Objectives. To demonstrate the feasibility of marker gene transfer to human LF cells and the effect of BMP-2 on the osteogenic differentiation of human LF cells. Summary of Background Data. BMP-2 is a widely known pivotal osteoinductive agent. Clinically and experimentally, BMP-2 has proven to be an effective in spinal fusion. Degenerated LF has only been implicated to be of pathophysiological significance in spinal stenosis. However, biologic modifications of LF to enhance osteogenesis have not been attempted previously. Materials and Methods. Human LF and cancellous bone from the ilium were harvested from patients with lumbar spinal stenosis. LF cells and osteoblasts were isolated and cultured, and adenovirus lacZ construct (Ad/ lacZ), luciferase construct (Ad/luciferase), and BMP-2 were designed and produced. LF cell cultures were then exposed to various concentrations of Ad/lacZ (25, 50, 75, 100, 150 multiplicity of infection) and BMP-2 (50, 100, 500, 1,000, and 1,500 ng/mL). Osteoblast cultures were used as a positive control for LF culture. LF cell cultures with Ad/luciferase served as viral controls for culture with Ad/ lacZ. The transgene expression of lacZ was assessed by X-gal stain and β-galactosidase assay. Alkaline phospha-tase, Von Kossa, and Alizarin red-S stains were used to confirm osteogenic differentiation and bone nodule formation. Immunocytochemical staining was also performed to detect osteocalcin expression. Results. LF cell cultures transduced with Ad/lacZ showed extensive X-gal expression and increased β-galactosidase activity compared to viral (Ad/luciferase) and saline controls. In LF cultures treated with BMP-2, robust alkaline phosphatase expression, and bone nodule formations were observed as evidenced by positive Von Kossa and Alizarin red-S staining, and the strong expression of osteocalcin. The osteogenic response of LF cells to BMP-2 was dose dependent. Conclusions. Human LF cells were found to be susceptible to adenovirus-mediated marker gene transfer, which offers the possibility of a new range of possible genetic modifications. In human LF cells, BMP-2 was found to markedly up-regulate the expression of osteogenic phenotypes and to induce bone nodule formation. The results of this study support the notion that biologically modified LF cells, i.e., LF cells treated with BMP-2, or with adenovirus-mediated BMP-2 cDNA gene transfer, may facilitate spinal fusion. The efficient transduction of marker gene to human ligamentum flavum cells was achieved using an adenovirus-mediated approach. Human ligamentum flavum cells treated with bone morphogenetic protein-2 showed the up-regulation of osteogenic phenotypes, i.e., the expression of alkaline phosphatase and osteocalcin. Ligamentum flavum cells with bone morphogenetic protein-2 also exhibited bone nodule formation by Von Kossa and Alizarin red-S staining. Therefore, degenerated human ligamentum flavum cells treated with bone morphogenetic protein-2 have an enhanced osteogenic potential, which could be applicable to spinal fusion surgery." @default.
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• W2047804938 date "2004-05-01" @default.
• W2047804938 modified "2023-10-18" @default.
• W2047804938 title "Biologic Modification of Ligamentum Flavum Cells by Marker Gene Transfer and Recombinant Human Bone Morphogenetic Protein-2" @default.
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• W2047804938 doi "https://doi.org/10.1097/00007632-200405010-00003" @default.
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