Senescent CD4⁺ T Cells Drive Diabetic Periodontitis via JAK-STAT-ROS-p38 MAPK

Area of Science:

• Immunology
• Cellular Biology
• Periodontology

Background:

• Diabetic periodontitis (DPD) is a severe complication of diabetes mellitus, characterized by rapid periodontal tissue destruction.
• CD4+ T lymphocytes are crucial in adaptive immunity and implicated in DPD pathogenesis via immunometabolic dysregulation.
• The specific role of CD4+ T cells in DPD progression requires further investigation.

Purpose of the Study:

• To investigate the functional dynamics and pathogenic contributions of CD4+ T cells in diabetic periodontitis.
• To elucidate the immunometabolic and signaling pathways involved in CD4+ T cell-mediated DPD pathogenesis.
• To identify potential therapeutic targets for mitigating DPD progression.

Main Methods:

• Single-cell RNA sequencing of gingival tissues from DPD mice.
• Experimental confirmation using a DPD mouse model and adoptive transfer experiments.
• Bioinformatics analysis of signaling pathways (JAK-STAT, p38 MAPK) and experimental validation of pathway activity and inhibition.

Main Results:

• Significant CD4+ T cell senescence was identified in DPD, experimentally confirmed and linked to exacerbated senescence-associated secretory phenotype (SASP) release.
• Senescent CD4+ T cells promote a self-amplifying inflammatory cycle, disrupting Th17/Treg balance and worsening bone loss.
• JAK-STAT and p38 MAPK pathways were upregulated in DPD, with their inhibition reducing CD4+ T cell senescence. JAK-STAT activation led to mtROS and TNF-α-p38 MAPK axis activation, causing p53 upregulation and senescence.

Conclusions:

• Senescent CD4+ T cells play a critical pathogenic role in diabetic periodontitis through SASP-mediated inflammation and immune cell recruitment.
• The JAK-STAT-mtROS and TNF-α-p38 MAPK signaling pathways are key mediators of CD4+ T cell senescence in DPD.
• Targeting CD4+ T cell senescence and these signaling pathways presents a promising therapeutic avenue for diabetic periodontitis.