Hydrogen-Powered Nanoparticles Boost Oral Vaccine Effectiveness

Authors
Journal
Biomedicine & Pharmacotherapy
Year
DOI
10.1016/j.biopha.2026.119229
Study Type
Mouse
Outcome
Positive
Peer Reviewed
Yes
Country
South Korea
Health Condition
Intestinal Infections
Body System
Digestive

TL;DR

Magnesium-propelled polymersome nanomotors protected vaccine cargo in stomach-like conditions, activated under intestinal pH to generate hydrogen-driven motion, improved antigen uptake, and strengthened mucosal IgA responses in an oral vaccine model.

Key Finding

Magnesium-propelled nanoparticles activated by intestinal pH generated hydrogen gas that enhanced antigen uptake by immune cells approximately 2.8-fold and produced significantly higher intestinal antibody responses in mice compared to non-propelled particles.

Summary

Researchers created tiny particles called ActiPSomes that deliver vaccine material through the mouth. These particles have a protective coating that keeps them safe in the stomach's acidic environment, then dissolve in the intestines to release magnesium, which generates hydrogen gas that helps the particles move and deliver their cargo more effectively. In mouse studies, this approach produced stronger immune responses in the intestines compared to standard particles, without causing harm.

Practical Takeaway

This is early-stage research in mice exploring how hydrogen-generating particles might improve oral vaccine delivery. While the results are promising for vaccine development, this technology has not been tested in humans, and the study does not address hydrogen water or hydrogen consumption as a health supplement. Any practical applications remain years away from human use.

Abstract

Oral vaccines must withstand gastric acid and mucus, reach microfold cells, and trigger durable mucosal IgA, but most carriers cannot simultaneously provide enteric protection, on-demand intestinal activation, and predictable biodegradation. We present magnesium-propelled polymersome (PSome) nanomotors (ActiPSomes) that conserve chemical fuel in the stomach via an enteric overcoat and activate in the intestine to enhance transport and antigen encounter. After coating, the hydrodynamic diameter increased from 141.33 ± 3.62 nm to 188.63 ± 2.03 nm, confirming formation of a protective layer. Nanoparticle-tracking analysis showed negligible directional motion under gastric conditions (pH 2.0) but pronounced propulsion at intestinal pH (pH 8.0); the size mobility relationship followed MSD theory with R² ≈ 0.96. In vitro, ActiPSomes increased macrophage uptake of Nile-red-labeled antigen ∼2.8-fold versus particles without magnesium and maintained a ∼2.1-fold advantage after sequential exposure to simulated gastric and intestinal environments. In vivo, oral dosing elicited significantly higher PEDV-specific IgA titers in feces and intestines at days 7 and 14 compared with controls (p < 0.05-0.001), with no adverse clinical signs or weight loss over 14 days. Mechanistically, intestinal pH dissolves the enteric layer to expose intravesicular Mg, generating hydrogen that drives active diffusion while PLA hydrolysis supports intestinal biodegradation. These data establish a generalizable nanoplatform for enteric-protected, fuel-efficient oral vaccination against mucosal pathogens. In this study, we developed magnesium-propelled PSome nanomotors, termed ActiPSomes, that integrate enteric protection, pH-triggered propulsion, and intestinal biodegradation to enhance oral antigen delivery and mucosal immunity.