Study identifies molecular mechanism linking gum disease to systemic inflammation

A study published on July 9, 2026, reveals how periodontitis drives systemic inflammation by reprogramming bone marrow neutrophils. Researchers identified the type I interferon-Chac2-glutathione pathway as the key driver of this inflammatory N1 polarization. In diabetic mice, periodontitis worsened glycemic control and pancreatic function, but silencing Chac2 using an AAV9 vector reversed these effects, offering a promising therapeutic target for chronic inflammatory comorbidities.

Periodontitis systemic inflammation mechanism

• ▪Periodontitis reprograms bone marrow neutrophils to promote systemic inflammation through a process known as central immune remodeling.
• ▪A study published in the International Journal of Oral Science on July 9, 2026, used mouse models to investigate how periodontitis reshapes immune responses.

Chac2-GSH metabolic pathway

• ▪Metabolic analyses of bone marrow neutrophils in periodontitis revealed that glutathione metabolism was the most strongly altered metabolic pathway.
• ▪The enzyme Chac2 regulates glutathione metabolism, and elevated Chac2 levels increase intracellular glutathione and enhance glutathione redox cycling.

Type I interferon signaling

• ▪Type I interferon signaling acts as the upstream regulator that triggers Chac2 activation in bone marrow neutrophils.
• ▪Disrupting type I interferon signaling in experiments prevented Chac2 activation, glutathione metabolic reprogramming, and N1 polarization.

Neutrophil N1 polarization

• ▪Activated N1 phenotype neutrophils release increased amounts of reactive oxygen species, form neutrophil extracellular traps, and secrete pro-inflammatory cytokines.
• ▪Periodontitis promotes N1 polarization in bone marrow neutrophils, transforming them into a highly inflammatory phenotype.

Diabetes comorbidity worsening

• ▪Transferring bone marrow neutrophils from mice with periodontitis into diabetic mice reproduced impaired glycemic control and pancreatic dysfunction.
• ▪Diabetic mice with periodontitis exhibited poorer glycemic control, impaired pancreatic function, and increased pancreatic neutrophil infiltration than diabetic mice alone.

Chac2 inhibition therapy

• ▪Silencing Chac2 using an AAV9 vector in diabetic mice with periodontitis improved glycemic control and pancreatic function after three weeks.
• ▪Inhibiting Chac2 represents a potential therapeutic target for periodontitis-associated inflammatory comorbidities and other chronic inflammatory diseases.

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