Growth factor effects on the expression of collagenase and TIMP-1 in periodontal ligament cells

O. Alvares, R. Klebe, G. Grant, D. L. Cochran

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


The fibroblast is a promiment cellular component of the periodontal ligament. It is believed to play an important role in collagen metabolism in health and disease. The turnover of collagen in the periodontal ligament is believed to be controlled by the balance between collagen synthesis and degradation. The family of matrix metalloproteinases and their inhibitors is one of the mechanisms which regulates this balance. The factors that regulate the synthesis of collagenase and its inhibitor, TIMP-1, by the periodontal ligament cell are poorly understood. The present study was undertaken to assess the effect of interleukin-1 beta (IL-1β), platelet-derived growth factor (PDGF), and transforming growth factor-β1 (TGF-β) on the expression of collagenase (MMP-1) and TIMP-1 rnRNA in periodontal derived fibroblasts using reverse transcription polymerase chain reaction (RT-PCR). Early passage periodontal ligament derived fibroblasts were treated with IL-1β (10 and 100 pg/ml), two isofomns of PDGF, -AA and -BB (4 and 20 ng/ml) and TGF-β (1 and 10 ng/ml). Treatment with growth factors from 2 to 24 hours revealed that the largest effects on MMP-1 mRNA occurred after 24 hours. IL-1β induced a 5 to 9 fold increase in MMP-1 mRNA. The two isofomns of PDGF had less of an effect (3 to 5 fold) on MMP-1 mRNA whereas TGF-β induced a 25 to 50% decrease in the expression of this message. None of the growth factors had an effect on TIMP-1 mRNA expression. These findings suggest that of the growth factors examined, IL-1β exerts the most profound effect on MMP-1 synthesis at the mRNA level. PDGF isoforms have less of an effect and consistent with other cell types, TGF-β had an inhibitory effect. Further, IL-1β, PDGF, and TGF-β had no effect on TIMP-1 mRNA level. These results demonstrate that, in human periodontal cells, IL-1β, PDGF-AA and -BB and TGF-β differentially and specifically regulate expression of collagenase mRNA but not that of its inhibitor.

Original languageEnglish (US)
Pages (from-to)552-558
Number of pages7
JournalJournal of periodontology
Issue number7
StatePublished - 1995


  • collagenase
  • fibroblasts
  • growth factor
  • growth factor
  • interleukin-1
  • metalloproteinases
  • periodontal ligament
  • platelet derived
  • transforming

ASJC Scopus subject areas

  • Periodontics


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