Research from the ALADDIN study at Karolinska Institutet indicates that certain gut bacteria in infants may reduce the risk of developing allergies later in childhood. These significant findings were published in Nature Microbiology.
The ALADDIN Study: Tracing Early Life Connections
The study meticulously monitored children from birth to five years of age to investigate the direct connection between early bacterial presence and allergy antibodies (IgE) in the blood. Researchers employed advanced DNA technology to analyze fecal samples from both children and their mothers, alongside measuring various lactic acids produced by the gut bacteria.
Children with high levels of bifidobacteria producing aromatic lactic acids, particularly 4-hydroxyphenyl lactate (4-OH-PLA), at an early age developed fewer allergy antibodies.
Protective Bifidobacteria Identified
Results showed a clear link: children with high levels of bifidobacteria producing aromatic lactic acids, particularly 4-hydroxyphenyl lactate (4-OH-PLA), at an early age developed fewer allergy antibodies. Furthermore, these children also exhibited a lower risk of atopic eczema when assessed at two years of age.
Factors Favoring Beneficial Gut Flora
The research identified several key factors that appeared to foster the establishment of these protective bifidobacteria in infants:
- Vaginal delivery
- Exclusive breastfeeding during the first two months
- Early contact with older siblings
Unveiling the Mechanism: 4-OH-PLA's Immunomodulatory Role
Laboratory experiments provided crucial insights into the mechanism behind these observations. They demonstrated that the lactic acid 4-OH-PLA reduced IgE production in immune cells by approximately 60 percent. This suggests an active and significant influence on the immune system exerted directly by these beneficial bacteria.
The ALADDIN study was a robust collaborative effort, involving researchers from Karolinska Institutet, the Technical University of Denmark, and other esteemed international research groups.