Ebi3 knockout aggravates experimental periodontitis via Th17 polarization

Area of Science:

• Immunology
• Oral Biology
• Genetics

Background:

• Epigenetic regulator Ebi3 (Epstein-Barr virus-induced gene 3) is crucial for cytokine production.
• Interleukin-35 (IL-35) and IL-27 are key cytokines involving Ebi3.
• Periodontitis is an inflammatory disease causing alveolar bone destruction.

Purpose of the Study:

• Investigate the role of Ebi3-related cytokines, specifically IL-35 and IL-27, in experimental periodontitis.
• Determine the impact of Ebi3 deficiency on the progression of periodontitis.
• Assess the therapeutic potential of IL-35 in mitigating periodontal damage.

Main Methods:

• Induction of experimental periodontitis in Ebi3 knockout (KO) and wild-type (WT) mice using silk ligatures.
• Gene expression analysis of gingival tissues.
• Histopathological examination (hematoxylin and eosin staining) and immunohistochemistry of maxillae.
• Micro-computed tomography (micro-CT) for alveolar bone resorption assessment.
• Treatment of Ebi3 KO mice with recombinant IL-35.

Main Results:

• Ebi3 KO mice exhibited significantly more severe alveolar bone resorption compared to WT mice.
• Elevated IL-17A expression and reduced IL-10 expression were observed in ligated gingival tissues of Ebi3 KO mice.
• Recombinant IL-35 treatment markedly reduced ligature-induced alveolar bone resorption in Ebi3 KO mice.

Conclusions:

• Th17 cells contribute to the exacerbation of experimental periodontitis in the absence of Ebi3.
• IL-35 plays a critical protective role in inhibiting periodontal tissue destruction.
• Targeting IL-35 may represent a therapeutic strategy for managing periodontitis.