title: Enhanced osteogenesis of human alveolar bone-derived mesenchymal stem cells for tooth tissue engineering using fluid shear stress in a rocking culture method.
abstract: This study instituted a simple approach to stimulate alveolar bone regeneration for tooth tissue engineering by controlling effects of low fluid dynamic shear stress (LFDSS) on growth and differentiation in vitro. Human alveolar bone-derived mesenchymal stem cells (hABMSCs) harvested from human mandibular alveolar bone were cultured with LFDSS to generate cultures containing bone-like formations. To distinguish between osteodifferentiation and bone-like formation, cells were cultured either with or without fluid shear stress. The calcium content and alkaline phosphatase (ALP) activity of hABMSCs were used as indicators of osteogenesis. Cell viability and proliferation after stimulating with LFDSS for 10-60 min/day were higher than with longer stimulations. Mineralized nodules formed when osteoblasts were cultured with an induction medium, a marker of osteogenic differentiation. ALP activity tended to increase after 10 and 60 min/day of stimulation. In addition, LFDSS conditions also increased gene expression of IBSP, RUNX2, COL-I, ALP, OCN, and OPN, as shown by reverse transcriptase-polymerase chain reaction. From the results of a proteomics array, LFDSS groups were intensely expressed with several factors (EGF, HGF, IGF, TGF, and PDGF). Furthermore, CD146 and Stro-1 expression increased in cells treated with 30 min/day and decreased in cells treated with 120 min/day, as determined by cell surface antigen analysis by fluorescence-activated cell-sorting analysis. These results strongly showed that LFDSS at the proper intensity and time enhanced the differentiation and maturation of hABMSCs. In conclusion, an appropriate level of LFDSS can potently and positively modulate proliferation and differentiation in hABMSCs.
authors.affiliation: Department of Biosystems and Biomaterials Science and Engineering, Seoul National University, Seoul, Korea.
authors.forename: Ki-Taek
authors.initials: KT
authors.lastname: Lim
authors.forename: Jangho
authors.initials: J
authors.lastname: Kim
authors.forename: Hoon
authors.initials: H
authors.lastname: Seonwoo
authors.forename: Jung Uk
authors.initials: JU
authors.lastname: Chang
authors.forename: Hwajung
authors.initials: H
authors.lastname: Choi
authors.forename: Jin
authors.initials: J
authors.lastname: Hexiu
authors.forename: Woo Jae
authors.initials: WJ
authors.lastname: Cho
authors.forename: Pill-Hoon
authors.initials: PH
authors.lastname: Choung
authors.forename: Jong Hoon
authors.initials: JH
authors.lastname: Chung
mesh_terms: D000469:Alkaline Phosphatase / Q000378:metabolism; D001483:Base Sequence; D001842:Bone and Bones / Q000166:cytology* / Q000201:enzymology; D017931:DNA Primers; D004591:Electrophoresis, Polyacrylamide Gel; D004797:Enzyme-Linked Immunosorbent Assay; D005434:Flow Cytometry; D006801:Humans; D059630:Mesenchymal Stem Cells / Q000166:cytology*; D008855:Microscopy, Electron, Scanning; D008856:Microscopy, Fluorescence; D010012:Osteogenesis; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013312:Stress, Physiological; D023822:Tissue Engineering; D014070:Tooth / Q000166:cytology*
chemical_list: D017931:DNA Primers; D000469:Alkaline Phosphatase