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Fibroblasts Control Macrophage Differentiation during Pulp Inflammation.

Chloé Le Fournis1, Charlotte Jeanneau1, Thomas Giraud2

  • 1Aix Marseille University, CNRS, Institute of Movement Sciences, Marseille, France.

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Pulp fibroblasts influence macrophage behavior during dental caries. They promote M1 macrophages to fight infection near the cavity and M2 macrophages at the periphery to aid healing.

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Area of Science:

  • Dental Pulp Biology
  • Immunology
  • Caries Research

Background:

  • Pulp inflammation involves M1 (pro-inflammatory) and M2 (anti-inflammatory) macrophages.
  • Pulp fibroblasts regulate inflammation through cytokine and growth factor secretion.

Purpose of the Study:

  • To investigate how pulp fibroblasts modulate macrophage differentiation in response to carious injury.

Main Methods:

  • Cultured pulp fibroblasts were injured and exposed to lipoteichoic acid (LTA) to simulate carious conditions.
  • Fibroblast supernatants were used to induce macrophage differentiation, assessing cytokine profiles and phagocytosis.
  • Immunofluorescence and histology examined macrophage phenotypes in human carious teeth.

Main Results:

  • Fibroblasts stimulated with LTA promoted M1 macrophage differentiation, increasing TNF-alpha and phagocytosis.
  • Injured fibroblasts without LTA induced M2 macrophage differentiation, increasing IL-10 secretion.
  • In carious teeth, M1 macrophages were found near caries, while M2 macrophages were in peripheral zones.

Conclusions:

  • Fibroblasts direct macrophage differentiation to M1 at the carious front for infection control.
  • Fibroblasts induce M2 differentiation in peripheral zones, potentially initiating healing.
  • The balance between M1 and M2 macrophages is crucial for initiating the healing process in dental pulp.