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Related Experiment Video

Updated: Jul 5, 2025

Robust Ligature-Induced Model of Murine Periodontitis for the Evaluation of Oral Neutrophils
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Transferrin receptor 2 mitigates periodontitis-driven alveolar bone loss.

Lennart Lösser1, Maria G Ledesma-Colunga1, Enrique Andrés Sastre1

  • 1Department of Medicine III & Center for Healthy Aging, Medical Faculty, Technische Universität Dresden, Dresden, Germany.

Journal of Cellular Physiology
|January 12, 2024
PubMed
Summary

Transferrin receptor 2 (Tfr2) deficiency worsens periodontitis and alveolar bone loss by increasing osteoclast activity and inflammation. Tfr2 plays a protective role in periodontitis pathogenesis.

Keywords:
Tfr2osteoclastperiodontitis

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Area of Science:

  • * Oral Biology and Pathology
  • * Immunology and Inflammation
  • * Bone Metabolism and Homeostasis

Background:

  • * Periodontitis is a major cause of alveolar bone loss, often more severe in patients with iron overload.
  • * The precise mechanisms linking iron overload, periodontitis, and bone loss are not fully understood.
  • * Transferrin receptor 2 (Tfr2) is a key regulator of iron homeostasis and has been implicated in bone cell function.

Purpose of the Study:

  • * To investigate the role of Tfr2 in the pathogenesis of periodontitis and its impact on alveolar bone.
  • * To elucidate the cellular and molecular mechanisms by which Tfr2 deficiency affects osteoclastogenesis and inflammation in periodontitis.
  • * To determine the influence of Tfr2 on the dental phenotype under basal and disease conditions.

Main Methods:

  • * Experimental periodontitis was induced in Tfr2-deficient (Tfr2-/-) and wild-type (Tfr2+/+) mice.
  • * Microcomputed tomography and histological analyses were used to assess alveolar bone loss and inflammation.
  • * Osteoclast differentiation, gene expression, and signaling pathways (p38-MAPK) were analyzed ex vivo.

Main Results:

  • * Tfr2-/- mice exhibited more severe periodontitis with increased immune cell infiltration and inflammation.
  • * Tfr2 deficiency led to greater alveolar bone loss, partly independent of iron levels.
  • * Tfr2-/- osteoclasts showed enhanced differentiation, resorptive activity, and increased p38-MAPK signaling.

Conclusions:

  • * Tfr2 plays a critical role in modulating the inflammatory response during periodontitis.
  • * Tfr2 deficiency exacerbates periodontitis-induced alveolar bone loss by promoting osteoclastogenesis via p38-MAPK signaling.
  • * Targeting Tfr2 or p38-MAPK signaling may offer therapeutic strategies for periodontitis and associated bone loss.