Oral Magnetoelectric Particles: A New Strategy for Gastric Vagus Nerve Modulation 

(1) Journal:

 Nature Biomedical Engineering, 2026

(2) Article Title: 

Non-invasive oral magnetoelectric vagus nerve neuromodulation for Parkinson’s disease therapy 

(3) Research Rationale: 

This work designs an oral magnetoelectric microparticle system. The gastric mucosa is selected as the site for neuromodulation. Under the excitation of an external alternating magnetic field, electric signals are generated in situ in the stomach to activate the gastric vagal afferent pathway. It explores the effects of this pathway on the activation of central nuclei, neurotransmitter regulation and related behavioral changes, with proof-of-concept studies in mouse models. 

(4) Material Development:

 1) Materials: The magnetoelectric microparticles consist of a nickel ferrite magnetic core and a barium titanate piezoelectric shell, with capsaicin modified on the surface.

 2) Functions: Capsaicin targets and binds to TRPV1 receptors on the gastric mucosa. Driven by an external magnetic field, the magnetic core deforms and the piezoelectric shell generates local electrical signals for in situ electrical stimulation. The microparticles exhibit stability in gastrointestinal environments and favorable biocompatibility. They do not enter the brain or migrate along the vagus nerve.

This study verifies that oral magnetoelectric particles can activate vagus nerve‑mediated gut‑brain signaling. Activation of brainstem nuclei, changes in neurotransmitters and inflammatory markers, as well as behavioral alterations in model animals are observed. It also suggests that the relevant effector pathways remain to be further clarified.

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