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Related Experiment Video

Updated: Nov 20, 2025

Studying Orthodontic Tooth Movement in Mice
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γδT Cells Are Essential for Orthodontic Tooth Movement.

S Wald1,2, A Leibowitz1, Y Aizenbud1

  • 1Institute of Dental Sciences, Faculty of Dental Medicine, Hebrew University, Jerusalem, Israel.

Journal of Dental Research
|January 22, 2021
PubMed
Summary
This summary is machine-generated.

Gamma delta T cells are crucial for orthodontic tooth movement. Ablating these cells reduces bone resorption by decreasing inflammatory signals and immune cell recruitment, essential for tooth repositioning.

Keywords:
Interleukin-17 (IL-17)bone resorptioninnate immunityoral mucosaosteoclastsperiodontal ligament

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Area of Science:

  • Immunology
  • Oral Biology
  • Orthodontics

Background:

  • Mechanical forces in oral tissues influence local immunity and bone remodeling.
  • T cells are implicated in translating mechanical stress to alveolar bone resorption during orthodontic tooth movement (OTM).
  • Previous studies questioned the role of alpha beta T cells in OTM-associated bone resorption.

Purpose of the Study:

  • To investigate the role of T cells, specifically gamma delta T cells, in the periodontal ligament (PDL) during OTM.
  • To elucidate the mechanisms by which T cells mediate bone resorption in response to mechanical forces.

Main Methods:

  • Leukocyte characterization in the PDL and gingiva.
  • Conditional ablation of gamma delta T cells in vivo using Tcrd-GDL mice.
  • Analysis of cytokine production (IL-17A, IFN-γ) and immune cell recruitment.
  • Assessment of osteoclastogenesis markers and osteoclast numbers at the OTM pressure site.

Main Results:

  • Gamma delta T cells, particularly Vγ6+, are enriched in the PDL and produce IL-17A.
  • Absence of gamma delta T cells significantly diminished OTM and associated bone resorption.
  • Ablation of gamma delta T cells reduced IL-17A expression, myeloid cell recruitment, and RANKL expression.
  • Fewer osteoclasts were observed at the pressure site in mice lacking gamma delta T cells.

Conclusions:

  • Gamma delta T cells are essential mediators of OTM-induced alveolar bone resorption.
  • These cells translate mechanical forces into immune responses, including cytokine production and immune cell recruitment, driving osteoclastogenesis.
  • Targeting gamma delta T cells may offer novel therapeutic strategies for modulating tooth movement.