Milk: a postnatal imprinting system stabilizing FoxP3 expression and regulatory T cell differentiation

Area of Science:

• Immunology
• Epigenetics
• Microbiology

Background:

• Breastfeeding offers protection against allergies and atopy.
• Early-life consumption of unboiled farm milk is linked to reduced atopic disease development.
• Farm milk intake correlates with increased FOXP3 demethylation and regulatory T cell (Treg) numbers.

Purpose of the Study:

• To identify the specific components in farm milk that regulate Treg differentiation and function.
• To understand the mechanisms by which farm milk promotes immune tolerance.

Main Methods:

• Translational research approach.
• Analysis of signalling pathways involved in Treg differentiation.
• Investigation of milk components including fatty acids, microRNAs, growth factors, bacteria, and oligosaccharides.

Main Results:

• Six major signalling pathways identified through which milk controls stable FoxP3 expression and Treg differentiation.
• Mechanisms include Akt-mTORC1 signalling, ω-3 fatty acids, exosomal microRNAs and TGF-β, milk-derived probiotics (Bifidobacterium, Lactobacillus), and oligosaccharides promoting Treg induction.
• Milk components influence FOXP3 methylation and IL-10 mediated Treg differentiation.

Conclusions:

• Milk acts as a complex signalling and epigenetic imprinting network.
• It promotes stable FoxP3 expression and long-lasting Treg differentiation.
• These postnatal events are critical for preventing atopic and autoimmune diseases.