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DPSCs from Inflamed Pulp Modulate Macrophage Function via the TNF-α/IDO Axis.

S Lee1, Q Z Zhang2, B Karabucak1

  • 1Department of Endodontics, School of Dental Medicine, University of Pennsylvania, Philadelphia, PA, USA.

Journal of Dental Research
|July 8, 2016
PubMed
Summary

Human dental pulp stem cells (DPSCs) and inflamed DPSCs (I-DPSCs) suppress macrophage TNF-α via the IDO pathway. This highlights their role in dental pulp immunity and repair mechanisms.

Keywords:
cytokinesinflammationinnate immunitymesenchymal stem cellmicroenvironmentpulpitis

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Area of Science:

  • Dental Pulp Biology
  • Immunology
  • Stem Cell Research

Background:

  • Human dental pulp stem cells (DPSCs) possess regenerative potential.
  • Inflamed DPSCs (I-DPSCs) from carious teeth retain stemness and differentiation capabilities.
  • Macrophages are key regulators of pulpal inflammation and repair.

Purpose of the Study:

  • To investigate the immunomodulatory effects of DPSCs and I-DPSCs on macrophage functions.
  • To elucidate the underlying mechanisms of DPSC/I-DPSC-mediated immunomodulation.
  • To assess the role of indoleamine-pyrrole 2,3-dioxygenase (IDO) in this process.

Main Methods:

  • Isolation and characterization of DPSCs and I-DPSCs.
  • In vitro coculture of DPSCs/I-DPSCs with differentiated THP-1 cells (macrophages).
  • Measurement of cytokine secretion (TNF-α, IL-1β) and assessment of IDO and COX-2 pathways.

Main Results:

  • DPSCs and I-DPSCs significantly suppressed TNF-α secretion by macrophages.
  • This suppression was mediated by the indoleamine-pyrrole 2,3-dioxygenase (IDO) pathway, not COX-2.
  • IDO expression was elevated in macrophages and mesenchymal stromal cells within inflamed pulp tissues.

Conclusions:

  • I-DPSCs exhibit stem cell properties and immunomodulatory functions similar to DPSCs.
  • DPSCs and I-DPSCs suppress macrophage TNF-α production through the IDO axis.
  • These findings provide a mechanistic basis for the role of DPSCs in dental pulp innate immunity and repair.