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Initial Characterization of Cells Derived from Human Periodontia

Department of Periodontics, Wilford Hall Medical Center, U.S. Air Force, San Antonio, Texas 78236

D.L. Carnes, jr

Departments of Endodontics and Orthopaedics, The University of Texas Health Science Center at San Antonio, Texas 78284

D.T. Graves

Department of Oral Biology and Periodontology, Boston University, Goldman School of Graduate Dentistry, 100 East Newton St., Boston, Massachusetts 02118

The studies presented in this report describe an initial characterization of cell types derived from explants of human periodontia. Cell cultures were established from human periodontal ligament (PL4, PL7), gingival tissue (GF2), and alveolar bone (BP1) by means of explant techniques and monolayer culture. Cells were studied at passage numbers 2-4 and were characterized on the basis of morphological, biochemical, and proliferative parameters. Subconfluent cells did not have distinct morphologies useful in distinguishing them from one another. At confluence, PL4 and BP1 cells formed multilayered cultures of randomly oriented cells, while PL7 and GF2 cells grew in a monolayer of parallel cells. Biochemically, PL4 and BP1 cells exhibited characteristics consistent with an osteoblast-like phenotype. These included a significant increase in PTH-stimulated cyclic AMP and high basal levels of alkaline phosphatase activity, which were decreased on exposure to PTH and increased after stimulation by 1, 25 dihydroxyvitamin D3. In contrast, PL7 and GF2 cells exhibited basal alkaline phosphatase levels that were low, and cyclic AMP levels were not modulated by PTH stimulation. Cell populations PL7 and GF2 did not proliferate in culture medium supplemented with 3% platelet-poor plasma. After the addition of platelet-derived growth factor (PDGF) to this medium, the proliferation of these cell populations was equal to that in media supplemented with 10% fetal bovine serum. In contrast, PL4 and BP1 cells did proliferate in culture medium supplemented with 3% platelet-poor plasma. The addition of PDGF to the medium resulted in only a moderate increase in the proliferation of cell populations PL4 and BP1. These results establish that both osteoblast-like and fibroblast-like cells can be cultured from adult human periodontal ligament and suggest methods for studying the cells in vitro.

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Journal of Dental Research, Vol. 68, No. 5, 761-767 (1989)
DOI: 10.1177/00220345890680050201


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