Exposures influencing total IgA level in colostrum

Area of Science:

• Human Lactation Research
• Immunology
• Infant Nutrition

Background:

• Immunoglobulin A (IgA) is vital for infant gut immunity maturation, primarily found in breast milk.
• Breast milk composition, including IgA, varies globally, but influencing factors remain unclear.

Purpose of the Study:

• To investigate the relationship between maternal and environmental exposures and Immunoglobulin A (IgA) levels in colostrum.
• To determine if specific factors influence IgA concentration in early breast milk.

Main Methods:

• Analysis of 294 colostrum samples from the MecMilk International cohort (London, Moscow, Verona).
• Quantification of total IgA using an automated Abbott Architect Analyser.
• Statistical analysis including correlation, multiple regression, and univariate comparisons.

Main Results:

• A significant inverse correlation was found between time postpartum and colostrum total IgA levels (r=-0.49).
• IgA levels were significantly influenced by colostrum collection time and country of collection.
• Mode of delivery showed a significant influence on total IgA after adjusting for maternal characteristics.

Conclusions:

• Colostrum IgA concentration declines rapidly post-birth, necessitating consideration of collection time in future analyses.
• Significant variations in IgA levels exist between countries (highest in Moscow, lowest in Verona).
• Further research is needed to confirm delivery mode effects and understand geographical variations in colostrum IgA.