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Journal of Dental Research
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Functional Characteristics of Gingival and Periodontal Ligament Fibroblasts

C. Giannopoulou

Division of Physiopathology and Periodontology, School of Dentistry, Medical Faculty, University of Geneva, 19 rue Barthelemy Menn, 1211 Geneve 4, Switzerland

G. Cimasoni

Division of Physiopathology and Periodontology, School of Dentistry, Medical Faculty, University of Geneva, 19 rue Barthelemy Menn, 1211 Geneve 4, Switzerland

In periodontal surgery, healing after Guided Tissue Regeneration (GTR) may be explained by differences in functional activities of gingival and periodontal ligament fibroblasts (GF and PDLF). Several studies in vitro have supported this hypothesis, but much remains to be defined. In the present work, gingival and periodontal ligament fibroblasts derived from five healthy subjects were isolated and compared in vitro. The morphology of the cells was observed under scanning electron microscopy (SEM). Several extracellular matrix components (ECM) were studied to compare the effects on fibroblast attachment, proliferation, and protein synthesis. Several biochemical markers were examined in both cellular extract (CE) and conditioned medium (CM). We also examined the muscle differentiation markers alpha-smooth muscle actin, desmin, and smooth-muscle myosin. Finally, we studied the effects of epithelial cells on the proliferation and protein synthesis of the two types of fibroblasts. GF and PDLF appeared identical under the SEM. All ECM components enhanced attachment; however, while collagen types I and IV promoted the attachment of GF, gelatin, laminin, and vitronectin promoted that of PDLF. Most ECM components increased the proliferation rate of GF and the biosynthetic activity of PDLF. The biochemical markers were similarly distributed between the two cell types, except for alkaline phosphatase, which was detected only in the CE of PDLF. Both GF and PDLF strongly expressed alpha-smooth-muscle actin and were negative for desmin; only PDLF were positive for smooth-muscle myosin. Epithelial cells increased the proliferation of both GF and PDLF but had no effect on their biosynthetic activity. These in vitro results may better explain the in vivo functional differences between GF and PDLF.

Key Words: fibroblasts • attachment factors • biomechanical markers • cytoskeletal proteins

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Journal of Dental Research, Vol. 75, No. 3, 895-902 (1996)
DOI: 10.1177/00220345960750030601
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