Exclusive Breastfeeding Drives AMPK-Dependent Thermogenic Memory in BAT and Promotes Long-Term Metabolic Benefits in Offspring.

Summary

In mice, exclusive breastfeeding imprints a durable AMPK- and α-ketoglutarate–dependent thermogenic program in brown adipose tissue via breast milk EV miR-125a-5p targeting HIF1AN. This thermogenic memory confers long-term resistance to diet-induced obesity and glucose intolerance; AMPK inhibition abrogates these benefits and αKG supplementation rescues impaired BAT in mixed-fed mice.

Key Findings

• Mixed formula feeding impaired BAT morphology, mitochondria, and thermogenesis, increasing adiposity and glucose intolerance under HFD.
• Exclusive breastfeeding preserved BAT thermogenic function for up to 12 weeks post-transplant and sustained AMPK activation.
• Breast milk EV miR-125a-5p targeted HIF1AN, enhancing AMPK signaling; AMPK inhibition abolished benefits.
• AMPK-induced α-ketoglutarate was essential for BAT thermogenesis; αKG supplementation rescued BAT defects in mixed-fed mice.

Clinical Implications

Reinforces recommendations for exclusive breastfeeding as a metabolic preventive strategy and nominates AMPK/αKG and milk EV miRNAs as translational targets for obesity and insulin resistance prevention.

Limitations

• Preclinical mouse model; human generalizability and dose-response of EV miRNAs remain untested.
• Sample sizes and sex-specific effects are not detailed in the abstract; long-term safety of αKG supplementation requires evaluation.

Future Directions

Prospective human studies to test breastfeeding-associated BAT programming markers (AMPK/αKG signatures, EV miR-125a-5p) and interventional trials targeting AMPK/αKG pathways for metabolic disease prevention.