To investigate whether periodontitis accelerates CD4+ T-cell senescence and its subsequent impact on systemic diseases, particularly rheumatoid arthritis.
Key Findings:
LIP group showed higher proportions of PD-1+CD153+ cells after in vitro stimulation, peaking at 18 weeks.
Elevated SASP cytokine levels and increased SA β-gal-positive cells were observed in the LIP group.
RNA-seq analysis revealed numerous differentially expressed genes related to senescence in unstimulated helper T cells from the LIP group.
Adoptive transfer of CD4+ T cells from the LIP group exacerbated collagen antibody-induced arthritis.
Interpretation:
Severe periodontal inflammation induces a 'senescence-primed' status in helper T cells, potentially exacerbating rheumatoid arthritis.
Limitations:
Study conducted in a mouse model, which may not fully replicate human conditions.
Focus on male mice may limit generalizability to female immune responses and their potential differences in periodontitis and arthritis.
Conclusion:
Findings highlight a novel cellular mechanism linking periodontitis to systemic disease, with implications for understanding the role of oral health in autoimmune conditions.
