Effects of TGF-β1 on the proliferation and differentiation of human periodontal ligament cells and a human periodontal ligament stem/progenitor cell line

Shinsuke Fujii, Hidefumi Maeda, Atsushi Tomokiyo, Satoshi Monnouchi, Kiyomi Hori, Naohisa Wada, Akifumi Akamine

Research output: Contribution to journalArticle

47 Citations (Scopus)

Abstract

Periodontal ligament (PDL) is a specialized connective tissue that influences the lifespan of the tooth. Transforming growth factor-β1 (TGF-β1) is a multifunctional cytokine, but little is known about the effects of TGF-β1 on PDL cells. Our aim has been to demonstrate the expression of TGF-β1 in rat PDL tissues and to evaluate its effects on the proliferation and gene expression in human PDL cells (HPLCs) and a human PDL stem/progenitor cell line, line 1-11, that we have recently developed. The expression of TGF-β1 in the entire PDL tissue was confirmed immunohistochemically, and both HPLCs and cell line 1-11 expressed mRNA from the TGF-β1, TGF-β type I receptor, and TGF-β type II receptor genes. Although exogenous TGF-β1 stimulated the proliferation of HPLCs, it did not upregulate the expression of alpha-smooth muscle actin (α-SMA), type I collagen (Col I), or fibrillin-1 (FBN1) mRNA or of α-SMA protein in HPLCs, whereas expression for these genes was attenuated by an anti-TGF-β1 neutralizing antibody. In contrast, exogenous TGF-β1 reduced the proliferation of cell line 1-11, although it upregulated the expression of α-SMA, Col I, and FBN1 mRNA and of α-SMA protein in this cell line. In addition, interleukin-1 beta stimulation significantly reduced the expression of TGF-β1 mRNA and protein in HPLCs. Thus, TGF-β1 seems to play an important role in inducing fibroblastic differentiation of PDL stem/progenitor cells and in maintaining the PDL apparatus under physiological conditions.

Original languageEnglish
Pages (from-to)233-242
Number of pages10
JournalCell and tissue research
Volume342
Issue number2
DOIs
Publication statusPublished - Nov 1 2010

All Science Journal Classification (ASJC) codes

  • Pathology and Forensic Medicine
  • Histology
  • Cell Biology

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