Gut Inflammation Markers, Diet, and Risk of Islet Autoimmunity in Finnish Children - A Nested Case-Control Study

Area of Science:

• Pediatric immunology
• Gastroenterology
• Nutritional science

Background:

• Gut dysbiosis and increased intestinal permeability are linked to type 1 diabetes autoimmunity.
• The specific role of gut inflammation in the development of autoimmunity remains unclear.

Purpose of the Study:

• To investigate the association between gut inflammation markers and the risk of islet autoimmunity in children.
• To determine if dietary factors are associated with gut inflammation markers.

Main Methods:

• A nested case-control study involving 75 children with islet autoimmunity and 88 controls from the Finnish Type 1 Diabetes Prediction and Prevention cohort.
• Dietary intake assessed via 3-day food records; stool samples analyzed for calprotectin and human beta-defensin-2 (HBD-2) at 6 and 12 months.
• Conditional logistic regression used to assess autoimmunity risk; ANOVA, t-tests, and general linear models used for secondary analyses.

Main Results:

• Human beta-defensin-2 (HBD-2) at 12 months showed a borderline association with increased islet autoimmunity risk.
• Higher fat intake correlated with increased HBD-2, while higher fiber, magnesium, and potassium intake correlated with lower HBD-2.
• Dietary factors and maternal education modulated the association between HBD-2 and autoimmunity.

Conclusions:

• Elevated HBD-2 levels in infancy may be associated with an increased risk of islet autoimmunity.
• Dietary composition plays a significant role in modulating gut inflammatory status in early life.