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Osteogenic differentiation of human periodontal ligament cells after transfection with recombinant lentiviral vector containing follicular dendritic cell secreted protein
Author(s) -
Xiang L.,
Ma L.,
He Y.,
Wei N.,
Gong P.
Publication year - 2014
Publication title -
journal of periodontal research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.31
H-Index - 83
eISSN - 1600-0765
pISSN - 0022-3484
DOI - 10.1111/jre.12135
Subject(s) - transfection , periodontal fiber , multiplicity of infection , recombinant dna , chemistry , alkaline phosphatase , western blot , microbiology and biotechnology , cell growth , cell culture , cell , biology , medicine , biochemistry , dentistry , enzyme , genetics , gene
Background and Objective Follicular dendritic cell secreted protein ( FDC ‐ SP ), has been identified in human periodontal ligament ( PDL ) in a recent study. It is suggested that the expression of FDC ‐ SP might be associated with the osteogenic differentiation and mineralization of human periodontal ligament cells (h PDLC s). However, the intrinsic mechanism regarding this is still unclear. The aim of this study was to establish h PDLC s with safe and efficient overexpression of FDC ‐ SP and to elucidate the influence of FDC ‐ SP transfection on h PDLC osteogenesis in periodontal regeneration. Material and Methods We first applied a recombinant lentiviral vector containing FDC ‐ SP to transfect h PDLC s via different multiplicity of infection ( MOI ) levels (1, 10, 20, 50 and 100). Western blot was performed to confirm the expression of FDC ‐ SP . MTT assay was employed to evaluate the proliferation status of transfected cells. Then, the extent of osteogenic differentiation was investigated by simultaneous monitoring of alkaline phosphatase ( ALP ) activity assessment, immunofluorescent staining, the expression patterns of osteoblastic markers and mineralization staining. Results We found that h PDLC s transfected via MOI 20, 50 and 100 exhibited expression of FDC ‐ SP protein compared with MOI 1 and 10. There was no significant effect of FDC ‐ SP transfection (at different MOI levels of 1, 10 and 20) on the proliferation of h PDLC s, whereas higher MOI levels (50 and 100) inhibited cell proliferation ability. In addition, ALP activity decreased significantly in FDC ‐ SP ‐transfected h PDLC s at day 7. When stained with alizarin red, cells overexpressing FDC ‐ SP formed less mineralized nodules at 21 d post‐induction of differentiation, compared with the control cultures. Osteogenic inhibition was also confirmed by ALP immunostaining. Moreover, m RNA expression levels of osteoblastic markers decreased after FDC ‐ SP transfection, which were in accordance with western blot results. Conclusion Our data suggest that MOI 20 is optimal to transfect h PDLC s, which achieves safe and efficient overexpression of FDC ‐ SP in transfected cells. Moreover, FDC ‐ SP overexpression inhibits osteogenic differentiation of h PDLC s. The present study contributes to a better understanding of the biological functions governing FDC ‐ SP ‐induced h PDLC differentiation.