Soluble CD14 Enhances the Response of Periodontal Ligament Stem Cells to P. gingivalis Lipopolysaccharide

PLoS One. 2016 Aug 9;11(8):e0160848. doi: 10.1371/journal.pone.0160848. eCollection 2016.


Periodontal ligament stem cells (PDLSCs) are lacking membrane CD14, which is an important component of lipopolysaccharide (LPS) signaling through toll-like receptor (TLR) 4. In the present study we investigated the effect of soluble CD14 on the response of human PDLSCs to LPS of Porphyromonas (P.) gingivalis. Human PDLSCs (hPDLSCs) were stimulated with P. gingivalis LPS in the presence or in the absence of soluble CD14 (sCD14) and the production of interleukin (IL)-6, chemokine C-X-C motif ligand 8 (CXCL8), and chemokine C-C motif ligand 2 (CCL2) was measured. The response to P. gingivalis LPS was compared with that to TLR4 agonist Escherichia coli LPS and TLR2-agonist Pam3CSK4. The response of hPDLSCs to both P. gingivalis LPS and E. coli LPS was significantly enhanced by sCD14. In the absence of sCD14, no significant difference in the hPDLSCs response to two kinds of LPS was observed. These responses were significantly lower compared to that to Pam3CSK4. In the presence of sCD14, the response of hPdLSCs to P. gingivalis LPS was markedly higher than that to E. coli LPS and comparable with that to Pam3CSK4. The response of hPdLSCs to bacterial LPS is strongly augmented by sCD14. Local levels of sCD14 could be an important factor for modulation of the host response against periodontal pathogens.

MeSH terms

  • Adolescent
  • Cell Differentiation / drug effects
  • Chemokine CCL2 / biosynthesis
  • Dose-Response Relationship, Drug
  • Drug Synergism
  • Gene Expression Regulation / drug effects
  • Humans
  • Interleukin-6 / biosynthesis
  • Interleukin-8 / biosynthesis
  • Lipopolysaccharide Receptors / chemistry*
  • Lipopolysaccharide Receptors / pharmacology*
  • Lipopolysaccharides / pharmacology*
  • Periodontal Ligament / cytology*
  • Porphyromonas gingivalis*
  • Solubility
  • Stem Cells / cytology
  • Stem Cells / drug effects*
  • Stem Cells / metabolism
  • Young Adult


  • Chemokine CCL2
  • Interleukin-6
  • Interleukin-8
  • Lipopolysaccharide Receptors
  • Lipopolysaccharides

Grant support

The study was supported by Authors Institution (Medical University of Vienna). The funder had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.