Hydrogen from Gut Bacteria May Fight Cancer by Boosting Immune Cells
- Authors
- Victor Pascal-Moussellard, Jean-Pierre Alcaraz, Stephane Tanguy, Cordelia Salomez-Ihl, Philippe Cinquin, Francois Boucher, Emilie Boucher
- Journal
- Nature Scientific Reports
- Year
- 2025
- DOI
- 10.1038/s41598-025-96346-3
- Study Type
- Mouse
- Outcome
- Positive
- Peer Reviewed
- Yes
- Country
- France
- Health Condition
- Melanoma
- Body System
- Immune System
TL;DR
Inulin, a dietary fiber, and inhaling hydrogen gas both boost the body's immune response and slow down the growth of skin cancer in mice.
Key Finding
Inhaled hydrogen gas produced comparable immune-stimulating and tumor-inhibiting effects to inulin consumption in mice, suggesting hydrogen generated from inulin fermentation may mediate inulin's antitumor properties.
Summary
Researchers studied whether molecular hydrogen (H2), a gas produced when gut bacteria break down inulin (a type of dietary fiber), might explain inulin's cancer-fighting effects. In mice, they compared eating inulin with inhaling hydrogen gas designed to match the exposure pattern from inulin digestion. Both treatments increased immune cells called T cells and slowed melanoma tumor growth similarly, suggesting that hydrogen gas—not inulin itself—may be responsible for the antitumor benefits.
Practical Takeaway
This mouse study provides early evidence that hydrogen gas might explain how inulin fights tumors, but it is far too preliminary to guide human treatment decisions. The research has not been tested in people, and translating mouse findings to human cancer therapy requires extensive additional research. Anyone considering inulin or hydrogen therapies for cancer should consult their oncologist.
Abstract
Inulin consumption and dihydrogen (H2) administration both exert antitumor effects on preclinical models as well as in clinical trials. As H2 is one of the major byproducts of inulin fermentation by bacterial species of the gut microbiota (GM), we hypothesized that H2 could mediate the antitumor effects of inulin. To provide evidence in favor of this hypothesis, we first determined the pattern of H2-exposure to which mice are subjected after inulin administration and developed an inhaled hydrogen therapy (H2T) protocol replicating this pattern. We then compared the effects on circulating immunity of a two-week daily inulin gavage with those of the corresponding H2T. We also compared the effects of inulin supplementation to those of the corresponding H2T on implanted melanoma growth and infiltration by T lymphocytes. Inulin and H2T induced a similar increase in circulating CD4+ and CD8+ T cells. In addition, both treatments similarly inhibited melanoma tumor growth. These results support a mechanism by which the H2 resulting from inulin fermentation by the GM diffuses across the intestinal barrier and stimulates the immunosurveillance responsible for the antitumor effec