International Journal of Oral Biology

The Korean Academy of Oral Biology (대한구강생물학회)
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Replicative Senescence of Periodontal Fibroblasts Induces the Changes in Gene Expression Pattern

  • Yi, Tac-Ghee (Department of Cell and Developmental Biology, Seoul National University) ;
  • Jun, Ji-Hae (Department of Cell and Developmental Biology, Seoul National University) ;
  • Min, Byung-Moo (Department of Oral Biochemistry, School of Dentistry and Dental Research Institute, Seoul National University) ;
  • Kim, Moon-Kyu (Department of Immunology, Kyungpook National University School of Medicine) ;
  • Kim, Gwan-Shik (Department of Cell and Developmental Biology, Seoul National University) ;
  • Baek, Jeong-Hwa (Department of Cell and Developmental Biology, Seoul National University)
  • Published : 2007.03.31
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Abstract

Tooth loss in elderly is mainly caused by alveolar bone loss via severe periodontitis. Although the severity of periodontitis is known to be affected by age, the aging process or the genetic changes during the aging of periodontal tissue cells are not well characterized. In this study, we investigated the effect of in vitro aging on the change of gene expression pattern in periodontal fibroblasts. Gingival fibroblasts (GF) and periodontal ligament fibroblasts (PDL) were obtained from two young patients and replicative senescence was induced by sequential subcultivation. When more than 90% cells were positively stained with senescence-associated ${\beta},-galactosidase$, those cells were regarded as aged cells. In aged GF and PDL, the level of phosphorylated retinoblastoma (RB) and $p16^{INK4A}$ protein was significantly decreased and increased, respectively. However, the protein level of p53 and p21, well known senescence-inducing genes, did not increase in aged GF and PDL. Although $p27^{Kip1}$ and $p15^{INK4B}$, another cyclin-dependent kinase inhibitors, were reported to be involved in replicative senescence of human cells, they were decreased in aged GF and PDL. Because senescent cells showed flattened and enlarged cell shape and are known to have increased focal adhesion, we examined the protein level of several integrins. Aged GF and PDL showed increased protein level of integrin ${\alpha}2$, ${\alpha}v$, and ${\beta}1$. When the gene expression profiles of actively proliferating young cells and aged cells were compared by cDNA microarray of 3,063 genes and were confirmed by reverse transcription-polymerase chain reaction, 7 genes and 15 genes were significantly and commonly increased and decreased, respectively, in aged GF and PDL. Among them, included are the genes that were known to be involved in the regulation of cell cycle, gene transcription, or integrin signaling. The change of gene expression pattern in GF and PDL was minimally similar to that of oral keratinocyte. These results suggest that $p16^{INK4A}/RB$ might be involved in replicative senescence of periodontal fibroblasts and the change of gene expression profile during aging process is cell type specific.

Keywords

References

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