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Estradiol Enhances Alveolar Bone Resorption by Promoting Osteoclast Differentiation in Experimental Periodontitis
Keisuke Yasuda1, Shinji Matsuda1,2, Takumi Memida1
1Department of Periodontal Medicine, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima 734-8553, Japan.
Dentistry Journal
|July 27, 2026
Summary
17β-estradiol (E2) exacerbates experimental periodontitis by promoting osteoclast differentiation, leading to increased alveolar bone resorption. This occurs independently of inflammatory cytokine or RANKL gene expression changes.
Area of Science:
- Endocrinology
- Periodontology
- Osteoimmunology
Background:
- Estrogen's role in periodontitis is not well understood.
- Estrogen is a critical female hormone influencing various physiological processes.
Purpose of the Study:
- To investigate the impact of 17β-estradiol (E2) on experimental periodontitis.
- To elucidate the mechanisms by which E2 affects alveolar bone resorption.
Main Methods:
- Ovariectomy (OVX) model in mice to alter E2 levels.
- Ligature-induced periodontitis model with E2 administration or aromatase inhibitor.
- Histological analysis of osteoclasts and gene expression in gingival tissue.
- In vitro assessment of E2's effect on osteoclast differentiation.
Main Results:
- OVX reduced E2 levels and alveolar bone resorption; E2 supplementation increased bone loss.
- E2 promoted osteoclast differentiation in vitro and in vivo, independent of RANKL or inflammatory cytokines.
- Estrogen receptor antagonism blocked E2's effect on osteoclast differentiation.
Conclusions:
- 17β-estradiol (E2) significantly increases alveolar bone resorption in experimental periodontitis.
- E2 promotes osteoclast differentiation, contributing to bone loss.
- The mechanism is independent of inflammatory cytokine and RANKL gene expression.
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