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Related Experiment Video

Updated: Jun 5, 2026

Disruption of the Mouse Blood-Brain Barrier by Small Extracellular Vesicles from Hypoxic Human Placentas
05:31

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Published on: January 26, 2024

Postpartum Exercise Promotes Maternal-Infant Molecular Communication via Breast Milk Small Extracellular Vesicles.

Devanshi Gupta, Kyle J Sevits, Katherine A Klaus

    Medrxiv : the Preprint Server for Health Sciences
    |June 4, 2026
    PubMed
    Summary

    Postpartum exercise boosts small extracellular vesicles (sEVs) in breast milk, delivering beneficial metabolic signals. These exercise-induced sEVs enhance infant cell mitochondrial function, promoting healthy metabolic development.

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    Rapid Isolation of Human Breast Milk-Derived Extracellular Vesicles
    04:35

    Rapid Isolation of Human Breast Milk-Derived Extracellular Vesicles

    Published on: November 14, 2025

    Area of Science:

    • Maternal-infant health
    • Metabolic programming
    • Extracellular vesicle biology

    Background:

    • Early-life nutrition and maternal signals in breast milk are critical for infant metabolic health.
    • Postpartum exercise benefits maternal health, but its effect on milk-borne signaling is unclear.
    • Small extracellular vesicles (sEVs) in breast milk mediate maternal-infant communication due to their protective cargo.

    Purpose of the Study:

    • To investigate the impact of postpartum exercise on breast milk sEV concentration and cargo.
    • To determine if exercise-induced changes in breast milk sEVs affect infant cellular metabolism.
    • To establish sEVs as a link between maternal physical activity and infant metabolic programming.

    Main Methods:

    • Collected breast milk samples from lactating women before and after a single session of moderate-intensity aerobic exercise.
    • Quantified sEV concentration and analyzed their protein, miRNA, and metabolite cargo.
    • Assessed the effect of breast milk sEVs from exercised vs. non-exercised mothers on mitochondrial respiration in neonatal-stage cells (UC-MSCs).

    Main Results:

    • A single session of moderate-intensity postpartum exercise significantly increased breast milk sEV concentration, with effects lasting for multiple milk collections.
    • Exercise led to an enrichment of sEVs with regulatory metabolic cargo, including specific proteins and miRNAs.
    • Breast milk sEVs from exercised mothers enhanced mitochondrial respiration and capacity in neonatal-stage cells.

    Conclusions:

    • Postpartum maternal exercise acts as a stimulus for increased sEVs in breast milk.
    • Exercise modifies the cargo of breast milk sEVs, enriching them with metabolically relevant molecules.
    • sEVs in breast milk serve as a crucial signaling pathway connecting maternal exercise to enhanced infant metabolic health and mitochondrial function.